2026-04-04T17:25:42Z https://jurnal.upnyk.ac.id/index.php/eksergi/oai

oai:jurnal.upnyk.ac.id:article/333 2023-03-22T11:34:06Z eksergi:ART driver

Pembuatan Edible Film dari Tepung Jagung Jaya, Danang edible film tepung jagung  Edible film adalah suatu lapisan tipis yang dibentuk untuk melapisi makanan (coating), berfungsi sebagai penghalang terhadap perpindahan massa dan atau sebagai pembawa aditif. Penggunaan tepung jagung sebagai edible film merupakan solusi yang menarik sebagai pembungkus pangan inovatif yang dapat menyatu pada bahan makanan. Tepung jagung dipilih karena dapat diuraikan oleh mikroorganisme dan dapat dimakan, sehingga dapat dikatakan lebih ramah lingkungan. Pembuatan edible film dari tepung jagung ini bertujuan untuk menentukan kuat tarik dan kelarutan dalam air edible film yang relatif baik terhadap komposisi bahan. Penelitian dilakukan dengan cara melarutkan tepung jagung sebanyak 10 gram dengan aquadest 50 ml, ditambahkan 70 ml aquadest mendidih dan dipanaskan sampai suhu ± 85ºC. Suspensi yang terbentuk didinginkan mengunakan pengaduk stirrer kemudian ditambahkan gliserol dan sorbitol. Edible film yang terbentuk kemudian dicetak dan dikeringkan menggunakan oven pada suhu 100ºC selama ± 4 jam. Perbandingan volume gliserol dengan sorbitol bervariasi dari: 0:1, 0:2,sampai 5:5. Karakterisasi edible film meliputi analisis kuat tarik (sifat mekanik) dan daya larut dalam air (sifat fisis). Komposisi relatif baik untuk sifat edible film yang dihasilkan adalah dengan perbandingan volume gliserol 1 ml dan volume sorbitol 1 ml dengan kuat tarik sebesar 17,2765 N dan daya larut sebesar 0,0091 g/ml. Prodi Teknik Kimia UPN "Veteran" Yogyakarta 2014-11-07 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article application/pdf https://jurnal.upnyk.ac.id/index.php/eksergi/article/view/333 10.31315/e.v10i2.333 Eksergi; Vol. 10 No. 2 (2010): Versi Cetak; 5-10 Eksergi; Vol 10 No 2 (2010): Terbitan Lama; 5-10 2460-8203 1410-394X 10.31315/e.v10i2 ind https://jurnal.upnyk.ac.id/index.php/eksergi/article/view/333/pdf

oai:jurnal.upnyk.ac.id:article/334 2022-08-15T04:32:21Z eksergi:ART driver

Pengaruh Penambahan Oksidator Kalium Bichromat pada Pengambilan Minyak Laka Pawignya, Harsa Laka oil Kalium bichromat Cashew trees have been planted in Indonesia. The yield of these trees has been utilized by many people as snack that is delicious and special, while their skin is often been thrown away, so becoming waste, although they can be utilized. Laka oil (CNSL) is a liquid in cashew skin that has economic value, such as its utilization in glue industry, varnish, synthetic resin, insecticide, fungicide, paint, brake lining and clutch plate.  In this  study , the taking of laka oil from cashew was conducted by using press hydraulic and soxhlet with petroleum ether solution. After obtaining laka oil, Calium Bichromate oxidator was added to improve the quality of laka oil obtained before. Variables studied were the effect of material water content, pressing pressure, the time of pressing on oil weight obtained and the number of Calium Bichromate on oil resin content.   From this study , with material of 100 grams it obtained the best condition on material water content of  7,5 % , pressing pressure of 450 kg/ cm2 , pressing time of 20 minuts, and the oil obtained was 8,5747 grams. Prodi Teknik Kimia UPN "Veteran" Yogyakarta 2014-11-07 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article application/pdf https://jurnal.upnyk.ac.id/index.php/eksergi/article/view/334 10.31315/e.v10i2.334 Eksergi; Vol. 10 No. 2 (2010): Versi Cetak; 11-14 Eksergi; Vol 10 No 2 (2010): Terbitan Lama; 11-14 2460-8203 1410-394X 10.31315/e.v10i2 ind https://jurnal.upnyk.ac.id/index.php/eksergi/article/view/334/284

oai:jurnal.upnyk.ac.id:article/335 2022-08-15T04:32:21Z eksergi:ART driver

Peluang dan Tantangan Komersialisasi Biodisel-Review Mahreni, Mahreni biodiesel ultrasonic reactor microalgae alternative energy Hydrogen is one of the environmentally friendly fuel, however hydrogen is not always available due to continuously increasing energy demand and fossil fuel availability become more limited. Gap between demand and supply is essential to find alternative fuels. Biodiesel could be a substituent for fossil fuels, especially for hydrogen. Biodiesel could be made by mixing vegetable oils or fats with fossil fuel with a ratio of (5-20) wt.% however in a long time effect of this mixture can damage the engine. To overcome the problem, biodiesel can be synthesized via transesterification of oil and alcohol with the aid of acid or base catalyst to produce glycerol and FAME (Fatty Acid Methyl Ester). Challenges faced for the commercialization of biodiesel among others, (1) expensive raw material (edible oil), (2) reaction time and separation of the relatively long time (minimum 15 hours), (3) the use of acid catalysts still leaves the problem of corrosion and corrosion of machine tools and pollution to the environment by the catalyst. To make biodiesel competitive in the market, used oil (waste cooking oils, WCO), agricultural waste, and recent studies using microalgae could be used as source of biodiesel production. To shorten the reaction time, reaction was carried out using ultrasonic reactor technology and to minimize environmental pollution to use the solid catalyst. This paper will summarize on the adoption of latest technologies in producing biodiesel from used frying oil and microalgae. Prodi Teknik Kimia UPN "Veteran" Yogyakarta 2014-11-07 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article application/pdf https://jurnal.upnyk.ac.id/index.php/eksergi/article/view/335 10.31315/e.v10i2.335 Eksergi; Vol. 10 No. 2 (2010): Versi Cetak; 15-26 Eksergi; Vol 10 No 2 (2010): Terbitan Lama; 15-26 2460-8203 1410-394X 10.31315/e.v10i2 ind https://jurnal.upnyk.ac.id/index.php/eksergi/article/view/335/285

oai:jurnal.upnyk.ac.id:article/336 2022-08-15T04:32:21Z eksergi:ART driver

Pengaruh Penambahan Aditif Proses Daur Ulang Minyak Pelumas Bekas terhadap Sifat-sifat Fisis Siswanti, Siswanti minyak pelumas bekas proses daur ulang aditif phenol nitrobenzen. Peningkatan jumlah kendaraan bermotor dan industri menyebabkan pemakaian minyak pelumas meningkat, akibatnya jumlah minyak pelumas bekas semakin meningkat. Hal ini jika dibiarkan dapat menyebabkan pencemaran lingkungan. Sehingga dengan memanfaatkan kembali minyak pelumas bekas dapat mengurangi pencemaran lingkungan dan mengurangi konsumsi minyak bumi. Salah satu cara pengolahan minyak pelumas bekas adalah dengan proses daur ulang. Minyak pelumas bekas hasil daur ulang memiliki mutu yang kurang baik, sehingga perlu ditingkatkan mutunya dengan menambahkan zat aditif. Proses daur ulang dilakukan dengan cara menghilangkan zat pengotor yang terkandung dalam minyak pelumas bekas menggunakan asam sulfat pekat kemudian ducuci dengan larutan deterjen dan ditambah CaCl2 sebagai pemecah emulsi. Selanjutnya untuk meningkatkan mutunya ditambah dengan aditif yaitu nitrobenzen dan phenol dengan perbandingan 1 :1 pada suhu 70 oC. Kondisi terbaik yang diperoleh dalam penelitian ini adalah perbandingan aditif dengan minyak pelumas hasil daur ulang 1,5 :1 untuk waktu pemakaian di dalam mesin gergaji kayu selama 6 jam. Prodi Teknik Kimia UPN "Veteran" Yogyakarta 2014-11-07 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article application/pdf https://jurnal.upnyk.ac.id/index.php/eksergi/article/view/336 10.31315/e.v10i2.336 Eksergi; Vol. 10 No. 2 (2010): Versi Cetak; 27-31 Eksergi; Vol 10 No 2 (2010): Terbitan Lama; 27-31 2460-8203 1410-394X 10.31315/e.v10i2 ind https://jurnal.upnyk.ac.id/index.php/eksergi/article/view/336/286

oai:jurnal.upnyk.ac.id:article/337 2022-08-15T04:32:21Z eksergi:ART driver

Pengaruh Kadar Garam Dapur Terhadap Suhu Makanan yang Dimasak dengan Microwave Nuri,MT, Wasir salt microwave temperature. Many people cook by using microwave oven.  There are some reasons for health and the others for practice. Generally they do not know that food temperature is depends on amount of polar compound. Salt is polar compound hence salt content  influenced temperature of food. The objective of research was to determine salt  content to food temperature which is cooked by microwave. This research was simulated by mixing 20 g starch and 20 g salt water with salt variation from 0 to 3,2%. The mixed was put  into Becker glass 100 cc. and heated in microwave oven in low power  level until medium.  The temperature was measured every 2,5 minute until 15 minute. This research  show that salt and electricity power influence the temperature. For examples electricity power level-low, in 15 minute the temperature increase from 37oC to 73 oC at 3,2 % salt content, while at salt 0% and electricity power medium level the temperature increase  up to 90 o C. Prodi Teknik Kimia UPN "Veteran" Yogyakarta 2014-11-07 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article application/pdf https://jurnal.upnyk.ac.id/index.php/eksergi/article/view/337 10.31315/e.v10i2.337 Eksergi; Vol. 10 No. 2 (2010): Versi Cetak; 32-35 Eksergi; Vol 10 No 2 (2010): Terbitan Lama; 32-35 2460-8203 1410-394X 10.31315/e.v10i2 ind https://jurnal.upnyk.ac.id/index.php/eksergi/article/view/337/287

oai:jurnal.upnyk.ac.id:article/338 2022-08-15T04:32:21Z eksergi:ART driver

Preparasi Membran Selulosa Asetat untuk Penyaringan Nira Tebu Murni, Sri Wahy cellulose acetate membrane sugar cane rejection permeation. In the current  the sugar cane process, the liquid  sugar cane is  purified  by physical  and chemical processes that need much energy and  produce waste. Membrane  process separation is alternative way  for purifying it. In this research, membrane was  prepared from cellulose acetate by phase inversion method with acetone as a solvent and formamide as additive. The experiment was conducted  by varying  cellulose acetate concentration and  evaporation period. Cellulose aseatat, acetone and formamide with a particular composition is stirred for 3-4 hours until homogeneous. Mixture is then filled into the bottle and closed tightly and left for 1 day. Furthermore, the mold is poured on flat glass and evaporated during the allotted time. Matter and its lining membrane is inserted in a tub filled with water at a temperature 2oC for 5 minutes, the membrane was then dried..  Performance of  membrane  produced was tested  determination by  liquid sugar cane. The result of the experiment showed that the best weight ratio of cellulose acetate:acetone:formamide was and evaporation period were 12.5:5.2:3.5  and  45 second respectively; the  membrane produced have volumetric flux, rejection of  TSS and       permeation      of sucrose       were 6.1698 l/m2.hour, 91.12%  and   89% respectively. Prodi Teknik Kimia UPN "Veteran" Yogyakarta 2014-11-07 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article application/pdf https://jurnal.upnyk.ac.id/index.php/eksergi/article/view/338 10.31315/e.v10i2.338 Eksergi; Vol. 10 No. 2 (2010): Versi Cetak; 36-41 Eksergi; Vol 10 No 2 (2010): Terbitan Lama; 36-41 2460-8203 1410-394X 10.31315/e.v10i2 ind https://jurnal.upnyk.ac.id/index.php/eksergi/article/view/338/288

oai:jurnal.upnyk.ac.id:article/339 2022-08-15T04:32:21Z eksergi:ART driver

Fenomena dan Kecepatan Minimum Fluidisasi Widayati, Widayati minimum velocity (Umf) fixed bed bubbling fluidization slugging fluidization. Phenomenon and the minimum fluidization velocity (Umf) solid-gas depend of particle type, gas flow rate, column diameter and height of solids bed. This research was conducted on sand of quartz, iron and volcano Merapi (group B the particle) in the column with 6 cm diameter and height of the bed that varies are 6 cm, 8 cm and 10 cm. Observations began after the air with the lowest velocity flow from the bottom upwards through the bed. From the observations obtained a phenomenon that occurs is the fixed bed, bubbling fluidization and slugging fluidization. Umf in the height of bed 6 cm were 10.3 cm/sec, 7.3 cm/sec and 4.8 cm/sec. While at the height of bed 8 cm were 11.9 cm sec, 7.3 cm/sec and 5.1 cm/sec. and at the height of the bed 10 cm value (Umf)  obtained were 8.8 cm/sec, 8.8 cm/sec and 5.8 cm/sec. Based on theoretical, the Umf  for quartz sand was 12.0 cm/sec, iron sand 16.2 cm/sec and sand volcano Merapi 12.3 cm/sec. Thus, the value Umf, an experiment that comes closest to the value Umf theory only occurs for the use of quartz sand column diameter of 6cm and 8cm height of the bed. Prodi Teknik Kimia UPN "Veteran" Yogyakarta 2014-11-07 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article application/pdf https://jurnal.upnyk.ac.id/index.php/eksergi/article/view/339 10.31315/e.v10i2.339 Eksergi; Vol. 10 No. 2 (2010): Versi Cetak; 42-46 Eksergi; Vol 10 No 2 (2010): Terbitan Lama; 42-46 2460-8203 1410-394X 10.31315/e.v10i2 ind https://jurnal.upnyk.ac.id/index.php/eksergi/article/view/339/289

oai:jurnal.upnyk.ac.id:article/340 2022-08-15T04:32:21Z eksergi:ART driver

Pemungutan Pektin dari Kulit dan Amapas Apel Secara Ekstraksi Subagyo, Purwo ampas apel buangan (limbah) ekstraksi kulit apel pektin. Apel dikonsumsi sebagai buah segar maupun produk olahan. Sebagai produk olahan (buah kaleng, jus, sari buah), apel menyisakan limbah berupa kulit dan ampas, yang kebanyakan digunakan subsitusi pupuk dan pakan ternak atau dibuang. Kandungan pektin dalam buangan tersebut belum termanfaatkan. Penelitian ini memanfaatkan limbah tersebut untuk dipungut kandungan pektinnya. Apel dikupas, sedang daging buah diperas, dipisahkan sari buahnya dan diambil ampasnya. Kulit dan ampas dikeringkan, kemudian diekstraksi dalam labu leher tiga dengan solven air pada suasana asam (dipakai, HCl). Ekstraksi dilakukan dengan variasi suhu (60, 70, 80, 90 dan 100 0C), pH (2; 2,5; 3; 3,5 dan 4), waktu (30, 60, 90, 120 dan 150) menit. Ekstrak disaring dalam keadaan panas, kemudian ditambahkan Aceton hingga terbentuk endapan. Endapan dicuci dengan Alkohol hingga netral dan dikeringkan dalam oven sampai beratnya kanstan, sebagai pektin kering. Kondisi operasi optimal dicapai pada suhu eketraksi 90 0C, dengan pH larutan untuk ampas (3,5), untuk larutan kulit pH 3, dan waktu operasi 90 menit. Pektin kering yang terpungut (rerata) pada kondisi operasi tersebut adalah 13,940 % (berat) untuk ampas dan 12,897 % (berat) untuk kulit apel.Perlu dilakukan uji kelayakan hasil jika pektin tersebut akan dimanfaatkan sebagai subsitusi bahan pangan, bahan pengobatan dan industri farmasi. Prodi Teknik Kimia UPN "Veteran" Yogyakarta 2014-11-07 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article application/pdf https://jurnal.upnyk.ac.id/index.php/eksergi/article/view/340 10.31315/e.v10i2.340 Eksergi; Vol. 10 No. 2 (2010): Versi Cetak; 47-51 Eksergi; Vol 10 No 2 (2010): Terbitan Lama; 47-51 2460-8203 1410-394X 10.31315/e.v10i2 ind https://jurnal.upnyk.ac.id/index.php/eksergi/article/view/340/290

oai:jurnal.upnyk.ac.id:article/341 2022-08-15T04:32:21Z eksergi:ART driver

Produksi Biodisel dari Minyak Jelantah Menggunakan Katalis Asam padat (Nafion/SiO2) Mahreni, Mahreni solid acid heterogeneous catalyst WCO renewable energy Nafion/SiO2. Production of biodisel from waste cooking oil (WCO) was performed using a double catalyst Nafion/SiO2 as esterification catalyst and NaOH is used as transesterification catalyst . Study was conducted through three stages:as well as  synthesis of Nafion/SiO2 solid acid catalyst, the synthesis of biodisel using a single catalyst (NaOH) and the synthesis of biodisel using a catalyst (Nafion/SiO2 and NaOH). Solid acid catalyst is made of Nafion 5 wt.% solution and the (Tetra Ethoxy Ortho silicate, TEOS) using solution phase sol-gel method to produce Nafion/SiO2. Furthermore Nafion/SiO2 was applied as esterification catalyst. Esterification reaction conditions at temperatures of 75oC and fixed reaction time of 45 minutes. The reaction is run at three-neck flask equipped with a stirrer, thermometer and cooling water. Products are separated and the upper layer is used as a reactant of transesterification reaction using NaOH catalyst and results biodisel (FAME). Result analysis of physical properties, ie viscosity, density and flash point FAME meets the standard requirements of biodisel. Chemical characterization in the FAME show there are more than six kinds of methyl esters indicate that FAME was formed. The percentage of biodisel that is produced by using dual catalyst is higher compared to using a single catalyst proved that the solid acid catalyst plays an important role in converting the free fatty acid in to ester in the WCO. Prodi Teknik Kimia UPN "Veteran" Yogyakarta 2014-11-07 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article application/pdf https://jurnal.upnyk.ac.id/index.php/eksergi/article/view/341 10.31315/e.v10i2.341 Eksergi; Vol. 10 No. 2 (2010): Versi Cetak; 52-57 Eksergi; Vol 10 No 2 (2010): Terbitan Lama; 52-57 2460-8203 1410-394X 10.31315/e.v10i2 ind https://jurnal.upnyk.ac.id/index.php/eksergi/article/view/341/291

oai:jurnal.upnyk.ac.id:article/342 2022-08-15T04:32:21Z eksergi:ART

Standards Practical Tools in Dealing with Climate Change Dulbert T, Biatna Climate Change Environmental Energy Drastic climate change is becoming an increasingly serious threat to the survival of living beings on this planet. Various effects have been caused by climate change such as rising temperatures, floods, rising sea level, the uncertain season and other radical changes. Other than forest destruction, as well as industry and transportation use fossil fuels contributed in exacerbating climate change. Indonesia, have adopted identical to the four Green House Gases (GHG) into the SNI via reprints. As a developing country and the condition of Indonesia's forests and peatland in the tropics, it is more easy going deforestation and degradation. Indonesia is concentrated to develop standards in deforestation field based decreased functions of tropical rain forests as carbon sinks are big enough, not to mention the peatland carbon stocks that have high potential around 36 Gton CO2 from 22 million hectares only. The development of ISO standards in measurements and calculations the Greenhouse Effect, Product Recycling, Promoting Environmental good, Energy Efficiency, Consumer Aware Environmental, very useful and contribute to tackle climate change significantly with the implementation of international standards. The most important thing now is how far the destruction of nature caused by human habits that are not environmentally friendly. Increasing understanding about the scale of change needed to tackle global warming, government, business and civil society should be able to perform the necessary steps and face the need to work in partnership to address such a change. In the long term the benefits of addressing climate change will far outweigh the impact costs . But in the short term, governments, business, and civil society will be more willing to bear those costs if they know their counterparts and competitors use standards, as a practical tool in dealing with climate change. Prodi Teknik Kimia UPN "Veteran" Yogyakarta 2014-11-07 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article https://jurnal.upnyk.ac.id/index.php/eksergi/article/view/342 10.31315/e.v10i2.342 Eksergi; Vol. 10 No. 2 (2010): Versi Cetak; 1-4 Eksergi; Vol 10 No 2 (2010): Terbitan Lama; 1-4 2460-8203 1410-394X 10.31315/e.v10i2 En

oai:jurnal.upnyk.ac.id:article/1969 2022-11-07T10:31:11Z eksergi:ART driver

Extraction of Cashew Seed Skin Oil from the Waste of Cashew Seed Skin (Anacardium occidentale) with Ultrasonic Aid EKSTRAKSI MINYAK KULIT BIJI METE DARI LIMBAH KULIT BIJI JAMBU METE (Anacardium occidentale) DENGAN ALAT ULTRASONIC CLEANING BATH Rengga, Wara Dyah Pita Hartanto, Dwi - Wibowo, Bayu Tri Setiawan, Mohammad cashew shell extraction n-hexane ultrasonic waves anacardic acid Cashew shell waste can be utilized as a raw material for one of the tile paint and brake oil industries. The conventional extraction process mostly provides less mass transfer, so the extraction process is slow and not maximal. Excessive amounts of solvents are often used but make the process expensive and pollute the environment. The right solution in extracting is with the help of ultrasonic. This study aims to obtain an optimization of cashew oil extraction process using ultrasonic waves with a frequency of 42 kHz. The effect studied was the ratio of cashew powder to n-hexane solvents and extraction time. The surface response method with the design of Central Composite Design was used to obtain a mathematical model that illustrates the relationship between the yield of cashew shell oil to the ratio and time of extraction. The results showed that the optimum condition of cashew nut oil extraction in the comparison composition of cashew skin powder against n-hexane solvent was 1: 3.25 (g / g) for 90 minutes with a yield of 36.15%. Cashew skin oil contains anacardic acid, cardanol, and other phenol compounds. Limbah kulit mete dapat manfaatkan sebagai bahan baku salah satu industri cat genteng dan minyak rem. Proses ekstraksi konvensional sebagian besar kurang memberikan perpindahan massa sehingga proses ekstraksi lambat dan tidak maksimal untuk mendapatkan minyak kulit mete. Pelarut dalam jumlah yang berlebihan sering digunakan namun membuat proses menjadi mahal dan mencemari lingkungan. Solusi yang tepat dalam mengekstraksi yaitu dengan bantuan ultrasonik. Penelitian ini bertujuan untuk mendapatkan optimasi proses ekstraksi minyak kulit mete dengan mengunakan gelombang ultrasonik dengan fekuensi 42 kHz. Pengaruh yang dipelajari adalah rasio serbuk  kulit mete terhadap pelarut n-heksana, dan waktu ekstraksi. Metode permukaan respon dengan rancangan Central Composite Design digunakan untuk memperoleh model matematis yang menggambarkan hubungan antara rendemen minyak kulit mete terhadap rasio dan waktu ekstraksi. Hasil penelitian menunjukkan bahwa kondisi optimum ekstraksi minyak kulit mete pada komposisi perbandingan serbuk kulit mete terhadap pelarut n-heksana sebesar 1:3,25 (g/g) selama 90 menit dengan rendemen sebesar 36,15%. Minyak kulit mete mengandung asam anakardat, kardanol, dan senyawa fenol lainnya.Cashew shell waste can be utilized as a raw material for one of the tile paint and brake oil industries. The conventional extraction process mostly provides less mass transfer, so the extraction process is slow and not maximal. Excessive amounts of solvents are often used but make the process expensive and pollute the environment. The right solution in extracting is with the help of ultrasonic. This study aims to obtain an optimization of cashew oil extraction process using ultrasonic waves with a frequency of 42 kHz. The effect studied was the ratio of cashew powder to n-hexane solvents and extraction time. The surface response method with the design of Central Composite Design was used to obtain a mathematical model that illustrates the relationship between the yield of cashew shell oil to the ratio and time of extraction. The results showed that the optimum condition of cashew nut oil extraction in the comparison composition of cashew skin powder against n-hexane solvent was 1: 3.25 (g / g) for 90 minutes with a yield of 36.15%. Cashew skin oil contains anacardic acid, cardanol, and other phenol compounds. Prodi Teknik Kimia UPN "Veteran" Yogyakarta 2019-07-23 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article application/pdf https://jurnal.upnyk.ac.id/index.php/eksergi/article/view/1969 10.31315/e.v0i0.1969 Eksergi; Vol. 16 No. 1 (2019); 1-6 Eksergi; Vol 16 No 1 (2019); 1-6 2460-8203 1410-394X 10.31315/e.v16i1 ind https://jurnal.upnyk.ac.id/index.php/eksergi/article/view/1969/pdf Copyright (c) 2019 Eksergi

oai:jurnal.upnyk.ac.id:article/2227 2022-03-29T08:18:20Z eksergi:ART driver

Optimization of the Citronellal Synthesis Process from Cymbopogon winterianus Assisted by Microwave using Methanol and N-Hexan Solvent Harianingsih, Harianingsih Kata kunci ekstraksi gelombang mikro sitronelal ABSTRAK: Proses ekstraksi minyak atsiri menjadi penting diperhatikan untuk menghasilkan rendemen yang lebih tinggi. Ekstraksi minyak sereh wangi yang biasa dilakukan adalah dengan maerasi, destilasi fraksinasi bertingkat, soxhlet dan proses konvensional lainnya. Hasil ekstrak dari minyak sereh wangi dengan komponen paling tinggi adalah sitronelal yaitu 35%. Sitronelal bermanfaat untuk pembuatan parfum, aerosol, detergen dan masih banyak yang lainnya. Pada penelitian ini dilakukan sintesis sitronelal dari sereh wangi menggunakan ekstraksi dengan bantuan gelombang mikro. Alat ekstraktor dibuat dengan memodifikasi alat ekstraktor berupa microwave yang diberi labu alas bulat sebagai media untuk bahan sereh wangi dan pelarut metanol dan n-heksan. Variabel yang berpengaruh antara lain waktu dan volume pelarut. Waktu yang digunakan 5, 10, 15, 20, 25 menit, daya sebesar 10, 20, 30, 50 W dan variasi volume pelarut metanol sebanyak 50, 100, 150 dan 200 ml.  Hasil penelitian diperoleh dengan waktu yang singkat dengan variabel beda daya diperoleh dalam waktu 5 menit diperoleh ekstrak sitronelal sebesar 30,1%. Pada volume yang rendah 50 ml diperoleh ekstrak sitronelal sebanyak 32,5%. Hasil perolehan sintesis sitronelal menggunakan bantuan gelombang mikro dan pelarut etanol ini lebih kecil dibandingkan ekstraksi evaporasi yang dapat mengekstrak sitronelal hingga mencapai 36%.Kata Kunci: ekstraksi; gelombang mikro; sitronelal ABSTRACT: The process of extracting essential oils is important to note in order to produce a higher yield. The extraction of citronella oil is commonly done with maerasi, stratified fractionation distillation, soxhlet and other conventional processes. The extract from citronella oil with the highest component was citronellal which was 35%. Sitronelal is useful for making perfumes, aerosols, detergents and many others. In this study, citronellal synthesis of citronella was done using microwave extraction. The extractor is made by modifying the extractor in the form of a microwave which is given a round bottom flask as a medium for the ingredients of citronella with metanol and n-hexan solvent. The variables that influence include time and volume of solvent. Time used 5, 10, 15, 20, 25 min, power 10, 20, 30, 50 W and variation of methanol solvent volume of 50, 100, 150 and 200 ml. The results obtained with a short time with variable power difference obtained within 5 minutes obtained 30 cm of sitronelal extract. At a low volume of 50 ml citronellal extract obtained as much as 32.5%. The result of citronellal synthesis using microwaves and ethanol solvent is smaller than evaporative extraction which can extract citronellal up to 36%.Keywords: extraction; microwave; citronellal Prodi Teknik Kimia UPN "Veteran" Yogyakarta 2018-07-04 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article application/pdf https://jurnal.upnyk.ac.id/index.php/eksergi/article/view/2227 10.31315/e.v15i1.2227 Eksergi; Vol. 15 No. 1 (2018): Vol 15, No 1 (2018); 1-4 Eksergi; Vol 15 No 1 (2018): Vol 15, No 1 (2018); 1-4 2460-8203 1410-394X 10.31315/e.v15i1 ind https://jurnal.upnyk.ac.id/index.php/eksergi/article/view/2227/pdf Copyright (c) 2018 Eksergi

oai:jurnal.upnyk.ac.id:article/2236 2022-03-29T08:14:16Z eksergi:ART driver

Effect of Clay Content in Sulfonated Poly-Ether–Ether Ketone (sPEEK) on Methanol Permeability via Direct Methanol Fuel Cell Membrane Hakim, Arief Rahman DMFC Nafion Komposit PEEK Clay Filler Karakteristik Direct Methanol Fuel Cell (DMFC) adalah sel pembangkit listrik yang menggunakan membran elektrolit sebagai sarana transportasi hidrogen/proton. Membran yang banyak digunakan adalah Nafion. Akan tetapi NafionÒmemiliki masalah metanol crossover, tidak tahan terhadap suhu tinggi dan harganya mahal. Pada penelitian ini difokuskan pada pembuatan membran pengganti Nafion untuk aplikasi DMFC. Membran yang digunakan untuk DMFC adalah dari jenis PEEK. Membran PEEK telah dimodifikasi dengan menggunakan proses sulfonasi pada suhu 60oC selama 3 jam dan ditambahkan clay sebagai filler dalam pelarut n-methyl-2-pyrrolidone (NMP). Karakteristik membran dapat dilihat dari morfologi membran, struktur membran, permeabilitas metanol, konduktivitas proton. Hasil penelitian menunjukan dengan sulfonasi 60oC selama 3 jam dianggap sebagai kondisi optimum pada penelitian sebelumnya, dengan penambahan clay 1%, 3%, 5% wt, penambahan sebanyak 1% dianggap sebagai penambahan optimum, menghasilkan konduktifitas 2.02E-03 S/cm, swelling 51.85% (air) 52.74% (metanol), permeabilitas 1,2E-05 cm2/s (refraktometer)1.5E-05 cm2/s (kurva kalibrasi), pengujian dan perhitungan permeabilitas dengan menggunakan 2 cara, yaitu refraktometer dan kurva kalibrasi hasilnya tidak jauh berbeda, sehingga kedua cara tersebut dapat digunakan, sehingga komposit sPEEK-Clay dengan penambahan 1% Clay yang optimum dapat digunakan untuk membrane pada DMFC. Keywords:  Prodi Teknik Kimia UPN "Veteran" Yogyakarta 2018-07-04 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article application/pdf https://jurnal.upnyk.ac.id/index.php/eksergi/article/view/2236 10.31315/e.v15i1.2236 Eksergi; Vol. 15 No. 1 (2018): Vol 15, No 1 (2018); 9-15 Eksergi; Vol 15 No 1 (2018): Vol 15, No 1 (2018); 9-15 2460-8203 1410-394X 10.31315/e.v15i1 ind https://jurnal.upnyk.ac.id/index.php/eksergi/article/view/2236/pdf Copyright (c) 2018 Eksergi

oai:jurnal.upnyk.ac.id:article/2249 2022-03-29T08:12:31Z eksergi:ART driver

Degradation of Direct Dyes Waste by Advanced Oxidation Processes (AOPs) Method of H2O2/MnO2 Combination with BOD, COD, and pH as The Test Parameters Degradasi Limbah Zat Warna Direk Dengan Metode Advanced Oxidation Processes (AOPs) Kombinasi H2O2/MnO2 dengan Parameter Uji BOD, COD dan pH Augustia, Venitalitya Alethea Sari Lestari, Inggit Dwi Rani, Maulita Dian AOPs degradasi H2O2/MnO2 limbah tekstil zat warna direk Advanced Oxidation Processes (AOPs) method has been applied and is growing in number of textile wastewater treatment. Textile industries are commonly using synthetic dyes in the dyeing process and will produce coloured-wastewater that is still contain of organic compound and is hard to be degraded. One of most frequently used synthetic dyes in textile industries is direct dyes. Direct dyes wastewater consists of azo bound whereby difficult to eliminate the colour and the concentration itself, thus an appropriate treatment such as AOPs is considered. The AOPs process to degrade direct dyes wastewater in this research uses a combination of H2O2 with catalyst MnO2. Parameter variation that carried out, are the variation of the ratio of wastewater and H2O2 volume, namely 1:1; 2:1 and 1:2. Whilst the using of mass of catalyst MnO2 is 1 g for each sample variation, namely 1 g for 250 ml and 500 ml H2O2. The results obtained after the BOD, COD and pH tests, are 230 mg/l, 784 mg/l and 5,26 respectively. This result is showed by the sample with variation 2:1 which is delivering the lowest values of BOD, COD and pH amongst the three sample variations mentioned ABSTRAK: Metode AOPs (Advanced Oxidation Processes) telah banyak digunakan dan semakin berkembang untuk diaplikasikan pada pengolahan limbah tekstil. Perusahaan tekstil biasanya menggunakan zat warna sintetis dan menghasilkan limbah berwarna yang masih mengandung senyawa organik dan sulit untuk didegradasi. Salah satu zat warna yang paling sering digunakan adalah zat warna direk. Limbah zat warna direk mengandung ikatan azo yang sulit untuk didegradasi sehingga membutuhkan penanganan yang tepat seperti dengan metode AOPs. Proses AOPs untuk mendegradasi zat warna direk pada penelitian ini menggunakan kombinasi larutan H2O2 dengan katalis MnO2. Parameter yang dilakukan antara lain variasi perbandingan volume limbah dengan larutan H2O2 50% yaitu 1:1; 2:1 dan 1:2. Sedangkan massa MnO2 yang digunakan adalah 1 g untuk setiap variasi perbandingan yang dilakukan, yaitu 1 g untuk 250 ml dan 500 ml larutan H2O2. Setelah dilakukan pengujian dengan parameter BOD, COD dan pH diperoleh hasil BOD, COD dan pH terendah pada sampel percobaan dengan variasi 2:1, yaitu sebesar 230 mg/l, 784 mg/l dan 5,26.Kata Kunci: AOPs; degradasi; H2O2/MnO2; limbah tekstil; zat warna direk ABSTRACT: Advanced Oxidation Processes (AOPs) method has been applied and is growing in number of textile wastewater treatment. Textile industries are commonly using synthetic dyes in the dyeing process and will produce coloured-wastewater that is still contain of organic compound and is hard to be degraded. One of most frequently used synthetic dyes in textile industries is direct dyes. Direct dyes wastewater consists of azo bound whereby difficult to eliminate the colour and the concentration itself, thus an appropriate treatment such as AOPs is considered. The AOPs process to degrade direct dyes wastewater in this research uses a combination of H2O2 with catalyst MnO2. Parameter variation that carried out, are the variation of the ratio of wastewater and H2O2 volume, namely 1:1; 2:1 and 1:2. Whilst the using of mass of catalyst MnO2 is 1 g for each sample variation, namely 1 g for 250 ml and 500 ml H2O2. The results obtained after the BOD, COD and pH tests, are 230 mg/l, 784 mg/l and 5,26 respectively. This result is showed by the sample with variation 2:1 which is delivering the lowest values of BOD, COD and pH amongst the three sample variations mentioned.Keywords: AOPs; degradation; direct dyes; H2O2/MnO2; textile wastewater Prodi Teknik Kimia UPN "Veteran" Yogyakarta 2018-07-04 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article application/pdf https://jurnal.upnyk.ac.id/index.php/eksergi/article/view/2249 10.31315/e.v15i1.2249 Eksergi; Vol. 15 No. 1 (2018): Vol 15, No 1 (2018); 5-8 Eksergi; Vol 15 No 1 (2018): Vol 15, No 1 (2018); 5-8 2460-8203 1410-394X 10.31315/e.v15i1 ind https://jurnal.upnyk.ac.id/index.php/eksergi/article/view/2249/pdf Copyright (c) 2018 Eksergi

oai:jurnal.upnyk.ac.id:article/2290 2022-03-29T08:15:31Z eksergi:ART driver

Bioethanol Production From Green Algae Spirogyra sp Jaya, Danang Setiyaningtyas, Rahayu Prasetyo, Sudiyono Bioetanol Fermentasi Saccharomyses cerevisiae Spyrogira sp Bioethanol is an alternative fuel that has potential to replace the oil fuel. The bioethanol feedstock can be derived from the green algae Spirogyra sp that is rarely exploited. High carbohydrates content in the Spirogyra sp algae is highly potential to be developed into ethanol through chemical and biological processes. This research is done through several stages: preparation of raw material, hydrolysis using sulfuric acid 0,2 M, and fermentation using Saccharomyses cerevisiae in an anaerob condition. The objective of this study is to find out the optimum reaction time and optimum quantity of Saccharomyses cerevisiae in the fermentation process. Variations of reaction time and yeast quantity are applied; those are 3, 4, 5 and 6 days for reaction time, and 0,5%; 0,75%; 1%; 1,25%; 1,5%; and 1,75% for yeast quantity. The stoichiometric calculation is used to analyse the result of this experiment. The result shows that the optimum duration for the fermentation is 5 days and the optimum quantity of yeast is 1% by weight. The condition of fermentation process must be held in pH of 4,5 and temperature of 30oC. The produced alcohol in those condition is 0,0613 mol. Prodi Teknik Kimia UPN "Veteran" Yogyakarta 2018-07-04 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article application/pdf https://jurnal.upnyk.ac.id/index.php/eksergi/article/view/2290 10.31315/e.v15i1.2290 Eksergi; Vol. 15 No. 1 (2018): Vol 15, No 1 (2018); 16-19 Eksergi; Vol 15 No 1 (2018): Vol 15, No 1 (2018); 16-19 2460-8203 1410-394X 10.31315/e.v15i1 ind https://jurnal.upnyk.ac.id/index.php/eksergi/article/view/2290/pdf Copyright (c) 2018 Eksergi

oai:jurnal.upnyk.ac.id:article/2291 2022-03-29T08:16:55Z eksergi:ART driver

Biodiesel Production from Waste Cooking Oil Assisted by Ultrasonic Wave Pembuatan Biodiesel dari Minyak Jelantah dengan Bantuan Gelombang Ultrasonik Murni, Sri Wahyu Nurrahmaningsih, Latifah Fitrianti, Punden Sando, Alex James, Jefry Roy amplitude biodiesel transesterification ultrasonic waste cooking oil In this research, the effect of ultrasonic on the transesterification reaction of waste cooking oil to biodiesel is studied. The biodiesel production from waste cooking oil is conducted in two process stages. All reactions are conducted with the ultrasonic power of 750 watt and frequency of 20 kHz. The first stage is the esterification process that aims to reduce the free fatty acid (FFA) contents using acid catalyst. The esterification reaction is carried out in certain condition. The second stage is the production of biodiesel through transesterification using alkaline catalyst. The parameters being studied are the effect temperature and ultrasonic amplitude to the transesterification reaction. The results shows that the FFA content can be reduced to 0,77% using sulfuric acid catalyst 1% by weight of oil, methanol to oil ratio of 6:1 and a reaction time of 60 minutes. Then, the oil is converted into biodiesel using KOH catalyst. The obtained conversion is 83% with the catalyst amount of 1% by weight of oil, methanol to oil ratio of 6:1, frequency of 20 kHz, amplitude of 50%, temperature of 60oC and reaction time of 40 minutes. The biodiesel has a density of 879 kg /m3 , 5,67 cst of viscosity, flash point of 158oC, pour point of 16oC, water content 0,0642% and caloric value 8521,1 kkal/kg. ABSTRAK: Pada penelitian ini, dipelajari pengaruh dari gelombang ultrasonik terhadap reaksi transesterifikasi dari minyak jelantah menjadi biodiesel. Pembuatan biodiesel dari minyak jelantah dilaksanakan dalam dua tahap. Seluruh reaksi dijalankan dengan gelombang ultrasonik berdaya 750 watt dan frekuensi 20 kHz. Tahap pertama adalah proses esterifikasi yang bertujuan mengurangi kandungan asam lemak bebas (FFA) menggunakan katalis asam. Reaksi esterifikasi berlangsung dalam kondisi tertentu. Tahap kedua adalah produksi biodiesel melalui transesterifikasi menggunakan katalis alkali. Parameter yang dipelajari adalah efek dari suhu dan amplitude terhadap reaksi transesterifikasi. Hasil dari percobaan menunjukkan bahwa kandungan FFA dapat diturunkan menjadi 0,77% menggunakan katalis asam sulfat 1% w/w minyak, rasio methanol terhadap minyak 6:1, dan waktu reaksi 60 menit. Selanjutnya, minyak diubah menjadi biodiesel menggunakan katalis KOH, dan diperoleh konversi sebesar 83% dengan jumlah katalis 1% w/w minyak, rasio methanol terhadap minyak 6:1, frekuensi 20 kHz, amplitude 50%, suhu 60°C, dan waktu reaksi 40 menit. Biodiesel yang dihasilkan memiliki densitas 879 kg/m3, viskositas 5,67 cst, titik nyala 158 °C, titik tuang 16 °C, kandungan air 0,0642%, dan nilai kalori 8521,1 kkal/kgKata Kunci: amplitudo; biodiesel; transesterifikasi; ultrasonik; minyak jelantah ABSTRACT: In this research, the effect of ultrasonic on the transesterification reaction of waste cooking oil to biodiesel is studied. The biodiesel production from waste cooking oil is conducted in two process stages. All reactions are conducted with the ultrasonic power of 750 watt and frequency of 20 kHz. The first stage is the esterification process that aims to reduce the free fatty acid (FFA) contents using acid catalyst. The esterification reaction is carried out in certain condition. The second stage is the production of biodiesel through transesterification using alkaline catalyst. The parameters being studied are the effect temperature and ultrasonic amplitude to the transesterification reaction. The results shows that the FFA content can be reduced to 0,77% using sulfuric acid catalyst 1% by weight of oil, methanol to oil ratio of 6:1 and a reaction time of 60 minutes. Then, the oil is converted into biodiesel using KOH catalyst. The obtained conversion is 83% with the catalyst amount of 1% by weight of oil, methanol to oil ratio of 6:1,  frequency of 20 kHz, amplitude of 50%, temperature of 60oC  and reaction time of 40 minutes. The biodiesel has a density of  879 kg /m3, 5,67 cst of viscosity, flash point   of 158oC,  pour point of 16oC, water content 0,0642% and caloric value 8521,1 kkal/kg.Keywords: amplitude; biodiesel; transesterification; ultrasonic; waste cooking oil Prodi Teknik Kimia UPN "Veteran" Yogyakarta 2018-07-04 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article application/pdf https://jurnal.upnyk.ac.id/index.php/eksergi/article/view/2291 10.31315/e.v15i1.2291 Eksergi; Vol. 15 No. 1 (2018): Vol 15, No 1 (2018); 20-23 Eksergi; Vol 15 No 1 (2018): Vol 15, No 1 (2018); 20-23 2460-8203 1410-394X 10.31315/e.v15i1 ind https://jurnal.upnyk.ac.id/index.php/eksergi/article/view/2291/pdf Copyright (c) 2018 Eksergi

oai:jurnal.upnyk.ac.id:article/2385 2022-03-29T08:22:36Z eksergi:ART driver

Application of Five Isoterm Adsorption Equilibrium Models on Adsorption of Chrom VI Metal Ion by Zeolite Penerapan Lima Model Kesetimbangan Adsorpsi Isoterm pada Adsorpsi Ion Logam Chrom VI oleh Zeolit Aini, Syarifah Supratikno, Supratikno Adsorben Isoterm BET Model Kesetimbangan Adsorpsi Zeolit Chrom VI metal ion include heavy metal waste which needs further processing using adsorbent. Zeolite is a suitable adsorbent for absorbing strong affinity chrom VI metal ions because zeolite is a natural mineral that has an active surface area per unit of mass and power. The purpose of this study was to determine a suitable model for the equilibrium adsorption of chrom VI metal ion by zeolite along with their parameter values, and to determine the optimal zeolite absorption against chrom VI metal ion. This study uses the method of applying the isotherm adsorption equilibrium model which includes 5 equations namely Linear Adsorption (Henry's Law), Freundlich Isotherm Adsorption, Langmuir Isoterm Adsorption, Brunauer-Emmett-Teller Isotherm (BET), Sigmoidal Chapman Equation. From these five models, data fitting is done to find models that are closer to the data. Data matching is done by minimizing the Matlab program. The results showed that the suitable model is the BET Isotherm Adsorption model with parameter values, namely the BET isotherm adsorption constant value (CBET) of 0.5183 l/mg, the maximum capacity of the adsorbent at equilibrium theoretical (qs) is 149.9977 mg/g and the saturated adsorbate concentration in the monolayer (Cs) is 184.1691 mg l. ABSTRAK: Ion logam chrom VI termasuk limbah logam berat yang perlu dilakukan pengolahan lebih lanjut dengan menggunakan adsorben. Zeolit adalah adsorben yang cocok untuk menyerap ion logam chrom VI  karena zeolit merupakan mineral alam yang mempunyai luas permukaan aktif per satuan massa yang besar dan daya afinitas yang cukup kuat. Tujuan dari penelitian ini adalah menentukan model yang cocok untuk kesetimbangan adsorpsi ion logam chrom VI oleh zeolit beserta nilai parameternya, dan mengetahui daya serap zeolit optimal terhadap ion logam chrom VI. Penelitian ini mengunakan metode penerapan model kesetimbangan adsorpsi isoterm yang  meliputi 5 persamaan yaitu Adsorpsi Linier (Henry’s Law), Adsorpsi Isoterm Freundlich, Adsorpsi  Isoterm Langmuir, Isoterm Brunauer-Emmett-Teller (BET), Persamaan Sigmoidal Chapman. Dari kelima model ini dilakukan fitting data untuk mencari model yang lebih mendekati data. Pencocokan data dilakukan dengan minimasi yang dilakukan oleh program Matlab. Hasil penelitian menunjukkan bahwa model yang cocok yaitu model Adsorpsi  Isoterm BET dengan  nilai parameter yaitu nilai konstanta adsorpsi isoterm BET (CBET) sebesar 0,5183 l/mg, kapasitas maksimal adsorben saat setimbang secara teoritis (qs) adalah 149,9977 mg/g dan konsentrasi adsorbat jenuh pada lapisan monolayer (Cs) adalah 184,1691 mg/l.Kata Kunci: Adsorben; Isoterm BET; Model Kesetimbangan Adsorpsi; Zeolit  ABSTRACT: Chrom VI metal ion include heavy metal waste which needs further processing using adsorbent. Zeolite is a suitable adsorbent for absorbing strong affinity chrom VI metal ions because zeolite is a natural mineral that has an active surface area per unit of mass and power. The purpose of this study was to determine a suitable model for the equilibrium adsorption of chrom VI metal ion by zeolite along with their parameter values, and to determine the optimal zeolite absorption against chrom VI metal ion. This study uses the method of applying the isotherm adsorption equilibrium model which includes 5 equations namely Linear Adsorption (Henry's Law), Freundlich Isotherm Adsorption, Langmuir Isoterm Adsorption, Brunauer-Emmett-Teller Isotherm (BET), Sigmoidal Chapman Equation. From these five models, data fitting is done to find models that are closer to the data. Data matching is done by minimizing the Matlab program. The results showed that the suitable model is the BET Isotherm Adsorption model with parameter values, namely the BET isotherm adsorption constant value (CBET)  of 0.5183 l/mg, the maximum capacity of the adsorbent at equilibrium theoretical (qs) is 149.9977 mg/g and the saturated adsorbate concentration in the monolayer (Cs) is 184.1691 mg l.Keywords: Adsorbent; BET Isotherm; Adsorption Equilibrium Model; Zeolite Prodi Teknik Kimia UPN "Veteran" Yogyakarta 2018-11-14 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article application/pdf https://jurnal.upnyk.ac.id/index.php/eksergi/article/view/2385 10.31315/e.v15i2.2385 Eksergi; Vol. 15 No. 2 (2018): Vol. 15 No.2 (2018); 48-53 Eksergi; Vol 15 No 2 (2018): Vol. 15 No.2 (2018); 48-53 2460-8203 1410-394X 10.31315/e.v15i2 ind https://jurnal.upnyk.ac.id/index.php/eksergi/article/view/2385/pdf Copyright (c) 2018 Eksergi

oai:jurnal.upnyk.ac.id:article/2387 2022-03-29T08:23:53Z eksergi:ART driver

Production of Activated Carbon from Waste Rubber Tyres Pyrolisis Pembuatan Karbon Aktif dari Hasil Pirolisis Ban Bekas Setyoningrum, Tutik Muji Setiawan, Agus Pamungkas, Ganang ban bekas karbon aktif aktivasi kimia Currently, alternative renewable energy is needed, one of which is RCO (Rubber Compound Oil) oil which is made from waste tires. The making of RCO oil causes problems in the form of carbon waste which, if discharged, will cause environmental impacts. Efforts are needed to deal with kabon waste resulting from used tire pyrolysis, one of which is the creation of activated carbon to increase the economic value of waste. So the purpose of this study is to study the operating conditions in the manufacture of activated carbon from waste produced by used tire pyrolysis. Activated carbon is one of the absorbents that can be used in material purification. This study makes activated carbon using a chemical activation method. KOH was chosen as activating agent and the activation temperature variable was used with temperature variations of 700, 800, and 900 °C with activation times for 30, 45, and 60 minutes. In this study, the best activated carbon was obtained with 900 °C operating conditions for 60 minutes which produced an active carbon surface area of 230 m 2 /g. ABSTRAK: Saat ini diperlukan alternatif energi baru terbarukan salah satunya minyak RCO (Rubber Compound Oil) yang  dibuat dari bahan baku ban bekas. Pembuatan minyak RCO ini menimbulkan permasalahan berupa limbah karbon yang apabila dibuang akan menimbulkan dampak lingkungan. Diperlukan upaya untuk menangani limbah kabon hasil pirolisis ban bekas salah satunya adalah pembuatan karbon aktif guna meningkatkan nilai ekonomi limbah. Sehingga tujuan dari penelitian ini adalah untuk mempelajari kondisi operasi dalam pembuatan karbon aktif dari limbah hasil pyrolisis ban bekas. Karbon aktif merupakan salah satu adsorben yang dapat digunakan dalam pemurnian bahan. Penelitian ini membuat karbon aktif dengan menggunakan metode aktivasi kimia. KOH dipilih sebagai aktivating agent serta digunakan variabel suhu aktivasi dengan variasi suhu 700, 800, dan 900 °C dengan waktu aktivasi selama 30, 45, dan 60 menit. Pada penelitian ini diperoleh hasil karbon aktif terbaik dengan kondisi operasi 900 °C selama 60 menit yang menghasilkan luas permukaan karbon aktif seluas 230 m2/g.Kata Kunci: ban bekas, karbon aktif, aktivasi kimia ABSTRACT: Currently, alternative renewable energy is needed, one of which is RCO (Rubber Compound Oil) oil which is made from waste tires. The making of RCO oil causes problems in the form of carbon waste which, if discharged, will cause environmental impacts. Efforts are needed to deal with kabon waste resulting from used tire pyrolysis, one of which is the creation of activated carbon to increase the economic value of waste. So the purpose of this study is to study the operating conditions in the manufacture of activated carbon from waste produced by used tire pyrolysis. Activated carbon is one of the absorbents that can be used in material purification. This study makes activated carbon using a chemical activation method. KOH was chosen as activating agent and the activation temperature variable was used with temperature variations of 700, 800, and 900 °C with activation times for 30, 45, and 60 minutes. In this study, the best activated carbon was obtained with 900 °C operating conditions for 60 minutes which produced an active carbon surface area of 230 m2/g.Keywords: waste tyres, activated carbon, chemical activation Prodi Teknik Kimia UPN "Veteran" Yogyakarta 2018-11-14 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article application/pdf https://jurnal.upnyk.ac.id/index.php/eksergi/article/view/2387 10.31315/e.v15i2.2387 Eksergi; Vol. 15 No. 2 (2018): Vol. 15 No.2 (2018); 54-58 Eksergi; Vol 15 No 2 (2018): Vol. 15 No.2 (2018); 54-58 2460-8203 1410-394X 10.31315/e.v15i2 ind https://jurnal.upnyk.ac.id/index.php/eksergi/article/view/2387/pdf Copyright (c) 2018 Eksergi

oai:jurnal.upnyk.ac.id:article/2453 2022-03-29T08:25:03Z eksergi:ART driver

Mapping and Analysis Experiment on Film Thickness Reducing in Gas Diffusion Layers of PEM Fuel Cell Pemetaan dan Analisis Penelitian Pengurangan Tebal Lapisan film pada Lapisan diffusi gas PEM Fuel Cell Sitanggang, Ramli lapisan tipis GDL pengurangan lapisan carbon density ukuran lapisan prestasi lapisan tipis One way to reduce the cost of making PEM Fuel Cells is to reduce the thickness of the layer. The layer is located between GDL and PEMFC electrode. This layer, to refute the electrode, is expressed with thickness, porosity, pore diameter, active surface area. In this working paper, the results of the thin film research results have been mapped and the results of the tests are to determine the characteristics of the thin layer thickness reduction. The mapping and analysis results were obtained at thicknesses ranging from 250 µm. In testing the thickness of 250 µm can still be reduced by a spray machine of 145 µm with a carbon density of about 2 mg cm-2 , but PEMFC's performance is smaller than the achievement of 250 µm thick. ABSTRAK: Salah satu cara untuk mengurangi biaya pembuatan PEM Fuel Cell adalah mengurangi tebal lapisan. Lapisan terletak diantara GDL dengan elektrode PEMFC. Lapisan ini, untuk menyanggah elektrode yang dinyatakan dengan tebal, porositas, diameter pori, luas permukaan aktif. Pada kertas kerja ini, dilakukan pemetaan hasil hasil penelitian lapisan tipis yang sudah dilaporkan dan hasil pengujian untuk mengetahui karakteristik pengurangan  ketebalan lapisan tipis tersebut. Hasil pemetaan dan  analisis  didapatkan  pada ketebalan berkisar 250 µm. Dalam  pengujian ketebalan 250 µm masih dapat dikurangi dengan mesin sepray sekitar 145 µm dengan densitas karbon sekitar  2 mg cm-2., tetapi prestasi PEMFC lebih kecil dari prestasi tebal 250 µm.  Kata Kunci: lapisan tipis GDL; pengurangan lapisan; carbon density; ukuran lapisan; prestasi lapisan tipisABSTRACT: One way to reduce the cost of making PEM Fuel Cells is to reduce the thickness of the layer. The layer is located between GDL and PEMFC electrode. This layer, to refute the electrode, is expressed with thickness, porosity, pore diameter, active surface area. In this working paper, the results of the thin film research results have been mapped and the results of the tests are to determine the characteristics of the thin layer thickness reduction. The mapping and analysis results were obtained at thicknesses ranging from 250 µm. In testing the thickness of 250 µm can still be reduced by a spray machine of 145 µm with a carbon density of about 2 mg cm-2, but PEMFC's performance is smaller than the achievement of 250 µm thick.Keywords: GDL thin layer; layer reduction; carbon density; layer size; thin layer performance Prodi Teknik Kimia UPN "Veteran" Yogyakarta 2018-11-14 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article application/pdf https://jurnal.upnyk.ac.id/index.php/eksergi/article/view/2453 10.31315/e.v15i2.2453 Eksergi; Vol. 15 No. 2 (2018): Vol. 15 No.2 (2018); 59-67 Eksergi; Vol 15 No 2 (2018): Vol. 15 No.2 (2018); 59-67 2460-8203 1410-394X 10.31315/e.v15i2 ind https://jurnal.upnyk.ac.id/index.php/eksergi/article/view/2453/pdf Copyright (c) 2018 Eksergi

oai:jurnal.upnyk.ac.id:article/2526 2022-11-07T10:31:11Z eksergi:ART driver

Production of Biodiesel from Coconut Waste by In-situ Transesterification Method and Catalyst Calcium Oxide Pembuatan Biodisel dari Ampas Kelapa dengan Metode Transesterifikasi In-Situ dan Katalis Kalsium Oksida Maulana, Afriando Ryan Setyoningrum, Tutik Muji biodisel ampas kelapa transesterifikasi in-situ kalsium oksida metanol Biodiesel is an alternative fuel for diesel engine that attracts the world attention. Indonesia is one of the biggest coconut producers in the world. Coconut meat waste is known to still contain up to 24% wt of vegetable oil. The potential of this coconut waste can be used for producing biodiesel that has economical value. This research uses coconut waste as the main raw material. The biodiesel production process is carried out by in-situ transesterification method with methanol as the solvent and reactant; and calcium oxide powder as the catalyst. The catalyst is activated by stirring and heating in methanol. The oil percentage in the coconut waste obtained from soxhletation is 20 % wt. The ratio of methanol to coconut waste of 12.5:1 (v/w) and catalyst to coconut waste of 3.5 % wt results the biodiesel yield of 96.43 % mol. The biodiesel flash point at this variable is 116 °C. This value has met the Badan Standar Nasional (BSN) standard Biodisel adalah bahan bakar alternatif untuk mesin disel yang mendapat perhatian besar dunia. Indonesia merupakan salah satu negara penghasil kelapa terbesar di dunia. Ampas daging kelapa masih mengandung minyak nabati sampai 24% berat. Potensi dari ampas kelapa tersebut dapat dimanfaatkan untuk memproduksi biodiesel yang ekonomis. Penelitian ini menggunakan ampas kelapa sebagai bahan baku utama. Proses produksi biodiesel dilakukan dengan transesterifikasi in-situ menggunakan metanol sebagai pelarut dan reaktan dan serbuk kalsium oksida sebagai katalis. Katalis diaktivasi dengan pengadukan dan pemanasan dalam metanol. Kadar minyak dalam ampas kelapa yang diperoleh melalui sokletasi sebesar 20% berat. Perbandingan metanol terhadap ampas kelapa 12.5:1 (v/b) dan perbandingan katalis terhadap ampas kelapa 3.5% (b/b) menghasilkan yield biodisel sebesar 96.43% (mol/mol). Titik nyala biodisel pada variable tersebut mencapai 116oC. Nilai tersebut telah memenuhi standar dari Badan Standar Nasional (BSN). Prodi Teknik Kimia UPN "Veteran" Yogyakarta 2019-07-23 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article application/pdf https://jurnal.upnyk.ac.id/index.php/eksergi/article/view/2526 10.31315/e.v16i1.2526 Eksergi; Vol. 16 No. 1 (2019); 13-17 Eksergi; Vol 16 No 1 (2019); 13-17 2460-8203 1410-394X 10.31315/e.v16i1 ind https://jurnal.upnyk.ac.id/index.php/eksergi/article/view/2526/pdf Copyright (c) 2019 Eksergi

oai:jurnal.upnyk.ac.id:article/2695 2022-11-07T10:31:11Z eksergi:ART driver

Environmental Impacts Evaluation of Sorbitol Production from Glucose Akmalina, Rifkah A life cycle assessment (LCA) has been performed on sorbitol production from glucose, which aims to quantify and evaluate the environmental impacts that produced from the process. SuperPro Designer software was employed to perform the process simulation, while SimaPro was used to quantify the LCA.Potency of global warming, acidification, eutrophication, photochemical oxidants creation, abiotic depletion, and ozone layer depletion were evaluated. A gate-to-gate LCA study of sorbitol production showed that global warming potential (GWP) had the largest impact to environment with the value of 3.551 kg CO2 eq/kg sorbitol. Glucose and electricity consumption were known as two major contributors to GWP, and hydrogen reactor was the main consumer of electricity. The use of glucose were responsible for more than 50% of total environmentalimpact in each category. Performing heat integration in sorbitol processing is highly recommended for gate-togate system to reduce energy demand, thus decreasing the environmental impacts. Therefore, this LCA study may be applied to perform a sustainable improvement on sorbitol production process.Keywords: sorbitol; life cycle assessment; global warming potential Prodi Teknik Kimia UPN "Veteran" Yogyakarta 2019-07-23 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article application/pdf https://jurnal.upnyk.ac.id/index.php/eksergi/article/view/2695 10.31315/e.v0i0.2695 Eksergi; Vol. 16 No. 1 (2019); 7-12 Eksergi; Vol 16 No 1 (2019); 7-12 2460-8203 1410-394X 10.31315/e.v16i1 eng https://jurnal.upnyk.ac.id/index.php/eksergi/article/view/2695/pdf Copyright (c) 2019 Eksergi

oai:jurnal.upnyk.ac.id:article/2747 2022-11-07T10:31:11Z eksergi:ART driver

A Short Review on Potential of Utilization Used Bottle Made from Polyethylene Terephthalate (PET) in Indonesia Tinjauan Potensi Pemanfaatan Botol Bekas Berbahan Polyethylene Terephthalate (PET) di Indonesia Fitriyano, Gema Rahim, Dicka Ar botol bekas PET polyethylene terephthalate pemanfaatan limbah The use of bottles made from Polyethylene Terephthalate (PET) has been increasing along with the development of ready-to-drink products. This type of packaging is very popular with the beverage industry because it is easily formed, strong, transparent, hygienic and economical. The increase in the use of PET bottles has an impact on the amount of waste that also increases so that it can become an environmental problem if it is not handled properly. The waste is still untapped in Indonesia, its utilization has only reached the stage of producing PET chopped which are then exported to countries that have beverage bottle recycling industries. This study aims to review the handling of used bottle waste, processing methods, shortcomings and advantages of products where this review is based on industry data and scientific articles. The consumption of beverages in PET bottle packaging which is increasing every year is a very promising potential for the development of research and the construction of industries related to processing used PET bottles in Indonesia Penggunaan botol berbahan Polyethylene Terephthalate (PET) semakin meningkat dikarenakan berkembangnya produk minuman siap saji. Kemasan jenis ini sangat digemari oleh industri minuman karena mudah dibentuk, kuat, transparan, higienis dan ekonomis. Peningkatan dari penggunaan botol PET berdampak terhadap jumlah limbahnya yang turut meningkat sehingga dapat menjadi masalah lingkungan jika tidak ditangani dengan baik. Limbah tersebut masih belum termanfaatkan di Indonesia, pemanfaatannya baru sampai tahap menghasilkan cacahan PET yang selanjutnya diekspor ke Negara yang memiliki industri daur ulang botol minuman. Studi ini bertujuan untuk meninjau penanganan limbah botol bekas, metode pengolahan, kekurangan serta kelebihan dari produk dimana ulasan ini didasarkan pada data industri dan artikel ilmiah. Konsumsi minuman dalam kemasan botol PET yang cenderung meningkat setiap tahunnya merupakan potensi yang sangat menjanjikan untuk dikembangkannya penelitian maupun dibangunnya industri yang terkait dengan pengolahan limbah botol bekas berbahan PET di Indonesia. Prodi Teknik Kimia UPN "Veteran" Yogyakarta 2019-07-23 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article application/pdf https://jurnal.upnyk.ac.id/index.php/eksergi/article/view/2747 10.31315/e.v16i1.2747 Eksergi; Vol. 16 No. 1 (2019); 18-24 Eksergi; Vol 16 No 1 (2019); 18-24 2460-8203 1410-394X 10.31315/e.v16i1 ind https://jurnal.upnyk.ac.id/index.php/eksergi/article/view/2747/pdf Copyright (c) 2019 Eksergi

oai:jurnal.upnyk.ac.id:article/2805 2022-11-07T10:32:57Z eksergi:ART driver

Growth of CeO2-doped ZnO Nanorods on Glass Substrates using Hydrothermal Method Penumbuhan ZnO Rods Terdoping CeO2 Pada Substrat Kaca Menggunakan Metode Hidrotermal Mayasari, Rina Dewi H, Yuliani Y, Deni M, Masmui J, Raharjo R, Nuryadi CeO2 ZnO rods kaca hidrotermal hexagonal flower-like Pure and cerium oxide (CeO2)-doped zinc oxide (ZnO) rods have been successfully grown on glass substrates using hydrothermal method. Growth of ZnO nanorods has two main processes, i.e. deposition of seed layer and growth of rods. The concentration ratios of Ce/ZnO are of about 1%, 5%, and 10%. The effect of CeO2 dopan on the structural and morphology of ZnO nanorods were investigated by X-ray diffraction (XRD), scanning electron microscope (SEM), energy dispersion X-ray (EDX), and Fourier transform infrared (FTIR). The XRD spektrum on pure and CeO2-doped ZnO rods have hexagonal wurtzite structure with three highest peaks on the lattice of (100), (002), and (101), and face-centered cubic CeO2 phase on the lattice of (111) and (200). Analysis result of SEM confirmed that pure and CeO2-doped ZnO rods formed agglomeration of hexagonal flower-like rods. The addition of CeO2 shifted ZnO peaks of FTIR spectrum from 729 cm-1 to ~780 cm-1 . Seng oksida (ZnO) rods murni dan terdoping serium oksida (CeO2) telah ditumbuhkan di atas substrat kaca dengan menggunakan metode hidrotermal. Penumbuhan ZnO rods memiliki dua tahapan proses utama, yaitu pelapisan seed (pembenihan) dan penumbuhan rods. Rasio konsentrasi Ce/ZnO adalah sebesar 1%, 5%, dan 10%. Efek dopan CeO2 pada struktur dan morfologi ZnO rods dianalisa dengan X-ray diffraction (XRD), scanning electron microscope (SEM), energy dispersion X-ray (EDX), dan Fourier transform infrared (FTIR). Spektrum XRD dari ZnO rods murni dan terdoping CeO2 memiliki fasa hexagonal wurtzite ZnO dengan tiga puncak tertinggi pada bidang kisi (100), (002), (101), serta fasa face-centered cubic CeO2 pada bidang kisi (111) dan (200). Hasil analisis SEM mengonfirmasi bahwa bentuk ZnO murni dan terdoping CeO2 adalah gumpalan hexagonal flower-like rods. Penambahan CeO2 telah menggeser puncak spektrum FTIR ZnO murni dari 729 cm-1 menjadi ~780 cm-1. Prodi Teknik Kimia UPN "Veteran" Yogyakarta 2019-11-18 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article application/pdf https://jurnal.upnyk.ac.id/index.php/eksergi/article/view/2805 10.31315/e.v16i2.2805 Eksergi; Vol. 16 No. 2 (2019); 31-34 Eksergi; Vol 16 No 2 (2019); 31-34 2460-8203 1410-394X 10.31315/e.v16i2 ind https://jurnal.upnyk.ac.id/index.php/eksergi/article/view/2805/pdf Copyright (c) 2019 Eksergi

oai:jurnal.upnyk.ac.id:article/2812 2022-11-07T10:32:57Z eksergi:ART driver

Coagulation and Electrocoagulation Methods with The Addition of Hydrogen Peroxide on Laundry Waste Treatment METODE KOAGULASI DAN ELEKTROKOAGULASI DENGAN PENAMBAHAN HIDROGEN PEROKSIDA PADA PROSES PENGOLAHAN LIMBAH CAIR BUANGAN LAUNDRY Prabowo, Bambang Hari Hendriyana, Hendriyana Nurdini, Lulu Firdaus, Mutiara C. Leinaldy P., Tengku Surfactant Laundry Electrocoagulation Coagulation Aluminium sulfate Phosphate. Problems with laundry waste, especially in the content of surfactants in detergents. Surfactants have properties as surface tension reducers. In the body of water can cause foam that can mediate itching. As domestic waste, this laundry waste is generally disposed directly to the environment without any treatment, which if left unchecked, of course, will be bad for the environment. The content in laundry wastes such as COD, BOD, TDS, pH, phosphate level and turbidity that do not comply with quality standards can cause polluted environments and can disrupt public health and the environment. In this study, two water treatment methods were applied, namely coagulation and electrocoagulation by adding 7 ml of 5% peroxide. This research was carried out in a batch process both electrocoagulation and coagulation. The parameters reviewed were COD, TSS, pH, phosphate level, PO4- and turbidity. Coagulation using alum coagulant (Aluminum sulfate). The variation of the two coagulation processes is, for coagulation, the stirring speed is 300 rpm for 10 minutes and the coagulant dose (500 ppm, 600 ppm, 700 ppm, 800 ppm and 900 ppm). In electrocoagulation contact times were varied (15 minutes, 20 minutes, 25 minutes, 30 minutes). The best results obtained were wastewater treatment using the Electrocoagulation method with a COD reduction of 76%, BOD 83%, turbidity 98% and phosphate 99.9%. Problems with laundry waste, especially in the content of surfactants in detergents. Surfactants have properties as surface tension reducers. In the body of water can cause foam  that can mediate itching. As domestic waste, this laundry waste is generally disposed directly to the environment without any treatment, which if left unchecked, of course, will be bad for the environment. The content in laundry wastes such as COD, BOD, TDS, pH, phosphate level and turbidity that do not comply with quality standards can cause polluted environments and can disrupt public health and the environment. In this study, two water treatment methods were applied, namely coagulation and electrocoagulation by adding 7 ml of 5% peroxide. This research was carried out in a batch process both electrocoagulation and coagulation. The parameters reviewed were COD, TSS, pH, phosphate level, PO4- and turbidity. coagulation using alum coagulant (Aluminum sulfate). The variation of the two coagulation processes is, for coagulation, the stirring speed is 300 rpm for 10 minutes and the coagulant dose (500 ppm, 600 ppm, 700 ppm, 800 ppm and 900 ppm). In electrocoagulation contact times were varied (15 minutes, 20 minutes, 25 minutes, 30 minutes). The best results obtained were wastewater treatment using the Electrocoagulation method with a COD reduction of 76%, BOD 83%, turbidity 98% and phosphate 99.9%. Keywords: Surfactant, Laundry, Electrocoagulation, Coagulation, Aluminium sulfate, Phosphate. Prodi Teknik Kimia UPN "Veteran" Yogyakarta 2019-11-18 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article application/pdf https://jurnal.upnyk.ac.id/index.php/eksergi/article/view/2812 10.31315/e.v16i2.2812 Eksergi; Vol. 16 No. 2 (2019); 53-58 Eksergi; Vol 16 No 2 (2019); 53-58 2460-8203 1410-394X 10.31315/e.v16i2 ind https://jurnal.upnyk.ac.id/index.php/eksergi/article/view/2812/pdf Copyright (c) 2019 Eksergi

oai:jurnal.upnyk.ac.id:article/2938 2022-11-07T10:31:11Z eksergi:ART driver

Laboratory Core-flooding Test of Surfactant-Polymer Injection Method for Oilfield Production Improvement Kristanto, Dedy Wibowo, Wibowo Hariyadi, Hariyadi Hermawan, Yulius Deddy Coreflooding enhanced oil recovery chemical flooding surfactant-polymer The utilization of chemical flooding to improve oil production in a large scale has many used for the oil field. Some cases have a success, and the others have fail when full scale project implemented. Before chemical flooding conducted, once of the recommended best practice to be done is chemical compatibility based on the reservoir characteristic of the layer as a target in improving oil recovery. Hence, coreflooding test in the laboratory to be an important thing to conduct in other to knows and determine the chemical performance after screening phase. The study of coreflooding test in the laboratory, shows that the measurement of surfactant and polymer properties have a good results to be used as an injection fluid in other to improve oil production. Surfactant - polymer injection which has concentrations of 3000 ppm and 1000 ppm with injection mechanism of 0.3 PV surfactant and 0.2 PV polymer gives the result of improving oil production it about 12.89%. Furthermore, based on the qualitative analysis obtained that the used of surfactant SS-B8020 as an injection fluid shown that plugging has not occurred in the reservoir rock pores, it means that the injection fluid was compatible with these reservoir rock. Prodi Teknik Kimia UPN "Veteran" Yogyakarta 2019-07-23 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article application/pdf https://jurnal.upnyk.ac.id/index.php/eksergi/article/view/2938 10.31315/e.v16i1.2938 Eksergi; Vol. 16 No. 1 (2019); 25-30 Eksergi; Vol 16 No 1 (2019); 25-30 2460-8203 1410-394X 10.31315/e.v16i1 eng https://jurnal.upnyk.ac.id/index.php/eksergi/article/view/2938/pdf Copyright (c) 2019 Eksergi

oai:jurnal.upnyk.ac.id:article/2993 2022-11-07T10:32:57Z eksergi:ART driver

Application of Cohen-Coon Method for Tuning of pH Controller Parameters in Neutralization Tank, Waste Water Treatment Unit Aplikasi Tuning Metode Cohen-Coon pada Pengendali pH di Tangki Neutralisasi, Unit Pengolahan Limbah Suharti, Profiyanti Hermien Sa'diyah, Khalimatus proporsional integral derivatif tangki netralisasi Wastewater generated in industry should be treated, in order to meet the standards set by the Government. pH became important parameters in the process of wastewater treatment. One of waste in industrial synthetic fibers contain ions that make pH of wastewater ranged from 2 to 3. The value of the threshold for the pH of the wastewater, based on regulation of the Minister of environment, ranged from 6 to 9. The main process to achieve this standar was the neutralization process. In order to fulfilment the pH target, pH controller has been used to monitor the pH at neutralization tank. pH controller which is used is a type of PID (proportional, integral, derivative) controller. The PID parameter that used in the controller are proportional gain (Kc) 10, integral time (τi) 1 minutes and 10 second as derivative time (τD). This parameter yields an oscillation response. This research aims to get the optimum PID parameters that can be applied to keep wastewater pH around 7. The experiment results show that the parameters of the PID controller Kc = 0.251, τi = 151 second = 2.51 minutes and τD = 12.5 second, had better performance than the PID controller parameters used previously. Air limbah yang dihasilkan dalam industri harus diolah terlebih dahulu, untuk memenuhi standar yang ditetapkan oleh Pemerintah. pH menjadi parameter penting dalam proses pengolahan air limbah. Seperti pada limbah industri serat sintetis mengandung ion yang membuat pH air limbah berkisar 2 hingga 3. Nilai ambang batas untuk pH air limbah, berdasarkan peraturan Menteri lingkungan, berkisar antara 6 hingga 9. Proses utama untuk mencapai standar ini adalah proses netralisasi. Pengontrol pH telah dipasang untuk memantau dan memenuhi target pH di tangki netralisasi. Pengontrol pH yang digunakan adalah jenis pengontrol PID (proporsional, integral, derivatif). Parameter PID yang digunakan dalam controller adalah proporsional gain (Kc) = 10, waktu integral = (τi) 1 menit dan waktu derivative (τD) = 10 detik. Parameter ini menghasilkan respons osilatif. Penelitian ini bertujuan untuk mendapatkan parameter PID optimal yang dapat diterapkan dalam IPAL sehingga pH air limbah bisa dikontrol pada kisaran pH 7. Hasil percobaan menunjukkan bahwa parameter pengontrol PID Kc = 0,251, τi = 151 detik = 2,51 menit dan τD  = 12,5 detik, memiliki kinerja yang lebih baik daripada parameter pengontrol PID yang digunakan sebelumnya. Prodi Teknik Kimia UPN "Veteran" Yogyakarta 2019-11-18 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article application/pdf https://jurnal.upnyk.ac.id/index.php/eksergi/article/view/2993 10.31315/e.v16i2.2993 Eksergi; Vol. 16 No. 2 (2019); 35-41 Eksergi; Vol 16 No 2 (2019); 35-41 2460-8203 1410-394X 10.31315/e.v16i2 ind https://jurnal.upnyk.ac.id/index.php/eksergi/article/view/2993/pdf Copyright (c) 2019 Eksergi

oai:jurnal.upnyk.ac.id:article/3027 2022-11-07T10:32:57Z eksergi:ART driver

Leaching Neodymium from Magnetic Coal Fly Ash using Acetic Acid Solvent Pelindian Neodymium dari Magnetik Coal Fly Ash menggunakan Asam Asetat sebagai Pelarut handoyo, haries Bendiyasa, I Made Prasetya, Agus neodymium pelindian magnetik CFA asam asetat Neodymium (Nd) has been known as a vital component in the modern industry such as for very strong permanent magnets (NdFeB magnet). Some countries are starting to look for alternative sources of Nd such as coal fly ash (CFA), which is the waste from coal combustion. This study aims to look at the potential for Nd extraction from CFA using acetic acid at atmospheric pressure. The effect of CH3COOH concentrations (0,1-1,0 N), and leaching temperature (26-60 oC) was investigated. The experiment was carried out under a constant agitation speed (400 rpm), S/L ratio (3,75 % (W/V)) and CFA particle size (-400 mesh). The highest leaching eficiencies (72%) were achieved for concentration of acetic acid 0,5 N at 60 oC. The leaching kinetics results showed that it best fits the shrinking core model: [t.kap=1-3(1-XB) 2/3 +2(1-XB)] ensuring the overall leaching process is controlled by difussion ash layer. The activation energy determined from the experimental study was of 15,38 kJ/mol. ABSTRAK: Neodymium (Nd) telah dikenal sebagai komponen penting dalam industri modern diantaranya sebagai magnet permanen (magnet NdFeB). Beberapa negara kini mulai mencari sumber alternatif Nd yang salah satunya adalah abu terbang batubara, yang merupakan hasil dari pembakaran batubara sebagai sumber energi listrik. Penelitian ini bertujuan untuk mempelajari pelindian Nd dari abu terbang batubara menggunakan asam asetat sebagai pelarut pada kondisi atmosferik. Pada penelitian ini dipelajari pengaruh konsentrasi asam asetat (0,1-1,0 N) dan pengaruh suhu pelindian (26-60 oC). Beberapa kondisi percobaan yang dijaga tetap yaitu kecepatan pengadukan (400 rpm), rasio S/L (3,75 % W/V) dan ukuran partikel (-400 mesh). Hasil pelindian tertinggi (72 %) diperoleh pada konsentrasi asam asetat 0,5 N pada 60 oC. Hasil percobaan menunjukkan pelindian Nd dari magnetik CFA menggunakan asam asetat mengikuti model shringking core yang dikontrol oleh difusi lapisan abu: [t.kap=1-3(1-XB)2/3 +2(1-XB)], dengan energi aktivasi sebesar 15,38 kJ/mol. Prodi Teknik Kimia UPN "Veteran" Yogyakarta 2019-11-18 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article application/pdf https://jurnal.upnyk.ac.id/index.php/eksergi/article/view/3027 10.31315/e.v16i2.3027 Eksergi; Vol. 16 No. 2 (2019); 42-46 Eksergi; Vol 16 No 2 (2019); 42-46 2460-8203 1410-394X 10.31315/e.v16i2 ind https://jurnal.upnyk.ac.id/index.php/eksergi/article/view/3027/pdf Copyright (c) 2019 Eksergi

oai:jurnal.upnyk.ac.id:article/3080 2022-11-07T10:30:19Z eksergi:ART driver

Design of a Simple Pyrolysis Reactor for Plastic Waste Conversion into Liquid Fuel using Biomass as Heating Source Kurniawan, Aditya Sugiarto, Bambang Perdana, Andri plastic pyrolysis liquid fuel biomass combustion reactor design A design that emphasizes simplicity and cost-effectiveness is applied to the plastic pyrolysis reaction system to produce liquid fuel. The reactor is fabricated from the waste refrigerant tank. The energy source for pyrolysis is generated by the combustion of biomass pellets. Forced convection by an electric blower is utilized to enhance the combustion efficiency and thus increase the heating rate with the overall average temperature at 412 °C. The coiled pipe is employed as a condenser system with water as its cooling media. The quantity of liquid product is measured for a different mass of PET-type plastic waste feed, with a maximum value of 17.7% w/w of feed mass is obtained. The physical characteristic of the liquid product is then analyzed using standard methods. It is found that its characteristics have approached the specification of commercial liquid fuel in the domestic market, with a liquid specific gravity of 0.776 and a heating value of 46 MJ/kg. Prodi Teknik Kimia UPN "Veteran" Yogyakarta 2020-04-03 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article application/pdf https://jurnal.upnyk.ac.id/index.php/eksergi/article/view/3080 10.31315/e.v17i1.3080 Eksergi; Vol. 17 No. 1 (2020); 1-6 Eksergi; Vol 17 No 1 (2020); 1-6 2460-8203 1410-394X 10.31315/e.v17i1 eng https://jurnal.upnyk.ac.id/index.php/eksergi/article/view/3080/pdf Copyright (c) 2020 Eksergi

oai:jurnal.upnyk.ac.id:article/3082 2022-11-07T10:32:57Z eksergi:ART driver

Characteristics of Porous Hydroxyapatite from Precursors of Rice Conch Shells and Porogeneous Materials of Breadfruit Karakteristik Hidroksiapatit Porous dari Prekursor Cangkang Keong Sawah dan Bahan Porogen Pati Sukun Sulistyawati, Endang Siregar, Robertinus Filustra Siregar Biomaterial Buah Sukun Hidroksiapatit Pori Cangkang Hydroxyapatite [Ca10(PO)4(OH)2] is a biomaterial used in bone implants to repair damaged tissue bones. Hydroxyapatite has biocompatible and osteoconductive properties. Hydroxyapatite synthesis is carried out by reacting Ca and P with a mole ratio of 1,67. One source of calcium precursors is conch shell with a CaCO3 content of 48,02%. The addition of porogen breadfruit starch serves to form pores so that it can accelerate the process of nutrient infiltration in bone. The study began with the calcination of conch shells at 900oC for 4 hours, to obtain calcium oxide (CaO) compounds. Calcium and phosphate reactions were carried out at 60oC and the stirring time was 3 hours. The hydroxyapatite produced was sintered at 900oC for 4 hours and analyzed using FTIR, AAS, UV-VIS, SEM, XRD, and compressive strength. The analysis solid and porous hydroxyapatite showed a comparison of calcium and phosphorus respectively 1.677 and 1.673, so that hydroxyapatite was close to the hydroxyapatite standard. Hydroxyapatite dense has a particle size of 0.396 μm, while porous hydroxyapatite has a particle size of 0.9135 μm and a pore of 0.655 μm. Hydroxyapatite dense and porous compressive strength are 19.61 MPa and 9,807 MPa respectively, so porous hydroxyapatite is more effective in nutrient infiltration to repair bone damage. Hidroksiapatit [Ca10(PO)4(OH)2] adalah biomaterial yang digunakan dalam bone graft implan tulang untuk memperbaiki jaringan-jaringan yang rusak dan tulang yang patah. Hidroksiapatit memiliki sifat biokompatibel dan osteokonduktif. Sintesis hidroksiapatit dilakukan dengan mereaksikan Ca dan P dengan perbandingan mol 1,67. Salah satu sumber prekursor kalsium adalah cangkang keong dengan kandungan CaCO3 53,10%. Penambahan bahan porogen pati sukun berfungsi untuk membentuk pori sehingga dapat mempercepat proses infiltrasi nutrisi pada tulang. Penelitian diawali dengan  proses kalsinasi  cangkang keong pada suhu 900oC selama 4 jam, untuk mendapatkan senyawa kalsium oksida (CaO). Reaksi kalsium dan posfat dilakukan pada suhu 60oC dan  variasi waktu stirring 3 jam. Hidroksiapatit yang dihasilkan disintering pada suhu 900oC dengan waktu 4 jam dan dianalisis kualitas dan morfologinya menggunakan FTIR, AAS, UV-VIS, SEM, XRD, dan kuat tekan. Hasil analisis menunjukkan perbandingan kalsium dan fosfor  untuk hidroksiapatit dense dan porous masing-masing 1,677 dan 1,673, sehingga hidroksiapatit  mendekati hidroksiapatit standar. Hidroksiapatit dense memiliki ukuran partikel 0,396 µm, sedangkan hidroksiapatit  porous memiliki ukuran partikel 0,9135 µm dan pori 0,655 µm. Kuat tekan hidroksiapatit dense dan porous masing-masing 19,61 MPa dan 9,807 MPa, sehingga hidroksiapatit porous lebih efektif dalam infiltrasi nutrisi untuk memperbaiki kerusakan tulang. Prodi Teknik Kimia UPN "Veteran" Yogyakarta 2019-11-18 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article application/pdf https://jurnal.upnyk.ac.id/index.php/eksergi/article/view/3082 10.31315/e.v16i2.3082 Eksergi; Vol. 16 No. 2 (2019); 59-63 Eksergi; Vol 16 No 2 (2019); 59-63 2460-8203 1410-394X 10.31315/e.v16i2 ind https://jurnal.upnyk.ac.id/index.php/eksergi/article/view/3082/pdf Copyright (c) 2019 Eksergi

oai:jurnal.upnyk.ac.id:article/3088 2022-11-07T10:32:57Z eksergi:ART driver

Chitosan Concentration and Cross-linker Volume Effect on The Release Kinetic of Red Ginger Oleoresin Microcapsule in Simulated Intestinal Fluid (SIF) Medium Jayanudin, Jayanudin Fahrurrozi, Moh. Wirawan, Sang Kompiang Rochmadi, Rochmadi kinetika release kitosan oleoresin jahe merah stimulated intestinal fluid Red ginger oleoresin contains components that can be used as antioxidants. Release kinetics studies are used to provide doses to achieve the desired drug concentration. The purpose of this study was to determine the release kinetics of red ginger oleoresin microcapsules based on changes in chitosan concentration and volume of cross-linker and determine the diffusion coefficient of red ginger oleoresin through microcapsule walls. Red ginger oleoresin microcapsules were prepared from a mixture of red ginger oleoresin in chitosan solution and stirred to form an emulsion. After that, it was added to corn oil and stirred again to form a second emulsion. Glutaraldehyde saturated toluene was added dropwise after finished added the 25% glutaraldehyde solution and remains stirred for 2 hours. Red ginger oleoresin microcapsules were separated and washed with petroleum ether and hexane, then dried in an oven. Microcapsules inserted in the release medium (simulated intestinal fluid) without enzymes, and then the samples were analyzed using a UV-vis spectrophotometer to determine the absorbance. The release kinetics models used were zero order, first order, Higuchi, Korsmeyer-Peppas, and Hixon-Crowell. The highest correlation coefficient (R2) was obtained from the Korsmeyer-Peppas release kinetics model, R2 = 0.73-0.85 with the value of n = 0.39-0.41. Based on the n value, the release mechanism of red ginger oleoresin microcapsules was Fickian diffusion. The diffusion coefficients obtained were 2,807 x 10-13 - 3,675 x 10-13 cm2 /sec. Prodi Teknik Kimia UPN "Veteran" Yogyakarta 2019-11-18 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article application/pdf https://jurnal.upnyk.ac.id/index.php/eksergi/article/view/3088 10.31315/e.v16i2.3088 Eksergi; Vol. 16 No. 2 (2019); 47-52 Eksergi; Vol 16 No 2 (2019); 47-52 2460-8203 1410-394X 10.31315/e.v16i2 eng https://jurnal.upnyk.ac.id/index.php/eksergi/article/view/3088/pdf Copyright (c) 2019 Eksergi

oai:jurnal.upnyk.ac.id:article/3095 2022-11-07T10:30:19Z eksergi:ART driver

Utilization of Tahitian Chestnut Wood Sawdust (Inocarpus Fagiferus) as Adsorbent of Heavy Metal Ions Pb(II) from wastewater Pemanfaatan Serbuk Kayu Pohon Gayam (Inocarpus Fagiferus) sebagai Bio Adsorbent Penjerap Ion Logam Berat Pb(II) dalam Limbah Cair Mutiara, Tintin Aziz, Jefri Dimas Irsack, Muhammad Gustav bio adsorbent serbuk kayu gayam logam berat limbah cair Tahitian chestnut (Inocarpus fagifer) was utilized as adsorbent to eliminate heavy metal ions in wastewater. In this research, Tahitian chestnut wood sawdust was chemical modified by alkali solution from potassium hydroxide and sodium hydroxide to enhance the adsorption capacity of the sawdust. Furthermore, the effect of pH solution and soaking time to the adsorption capacity of Tahitian chestnut wood sawdust was investigated. Based on the experiment data, it can be concluded that the kinetic of adsorption Pb(II) ions onto the adsorbent Tahitian chestnut wood sawdust was well illustrated by Lagergren 2 nd order mathematic model with the value of determination coefficient (R2 ) was 0,9496. Gayam (Inocarpus fagifer) dimanfaatkan sebagai bahan penjerap alami (bio adsorbent) untuk mengolah limbah cair dengan kandungan ion logam berat. Pada penelitian ini serbuk kayu gayam dimodifikasi kimia dengan larutan basa potasium hidroksida dan sodium hidroksida untuk meningkatkan kapasitas penjerapan. Selain itu kapasitas penjerapan serbuk kayu gayam diteliti terhadap pengaruh pH larutan dan waktu kontak. Berdasarkan data penelitian diperoleh hasil bahwa kinetika proses penjerapan ion Pb(II) ke dalam bio adsorbent kayu gayam dapat diilustrasikan dengan model matematis Lagergren order dua dengan nilai koefisien determinasi (R2) 0,9496. Prodi Teknik Kimia UPN "Veteran" Yogyakarta 2020-04-03 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article application/pdf https://jurnal.upnyk.ac.id/index.php/eksergi/article/view/3095 10.31315/e.v17i1.3095 Eksergi; Vol. 17 No. 1 (2020); 7-10 Eksergi; Vol 17 No 1 (2020); 7-10 2460-8203 1410-394X 10.31315/e.v17i1 ind https://jurnal.upnyk.ac.id/index.php/eksergi/article/view/3095/pdf Copyright (c) 2020 Eksergi

oai:jurnal.upnyk.ac.id:article/3097 2023-02-22T02:59:50Z eksergi:ART driver

Preparation of Porous Carbon from Coffee Ground Waste as Matrix of Urea Slow Release Fertilizer PREPARASI KARBON BERPORI DARI LIMBAH AMPAS KOPI SEBAGAI MATRIKS PADA PEMBUATAN SLOW RELEASE FERTILIZER Diana, Diana Mukti, Nur Indah Fajar Fachreza, Fakhri Irfansyah, Irfansyah karbon berpori ampas kopi slow release fertilizer Urea is one of the fertilizers that are widely used in agriculture. However, the absorption efficiency of urea for plants is currently only around 30%. Therefore, to increase its absorption in plants it is necessary to control the release of urea by making it a Slow Release Fertilizer (SRF) fertilizer. The use of SRF is expected to control the release of nutrients according to the time and amount needed by plants. Natural material which has the potential as a matrix of SRF fertilizer is coffee grounds waste. This research produces carbon from coffee pulp waste which can be used as a matrix in the manufacture of urea SRF fertilizer. With the addition of a matrix of coffee carbon is expected to slow the rate of release of urea into nature. So that the process of absorption of urea into plants will be more leverage. Coffee pulp was pyrolysed with pyrolysis temperature variation (400 - 600oC) using ZnCl2 as activator. The iodine number value of coffee grounds carbon produced decreases with increasing temperature. The addition of carbon coffee grounds can inhibit the release of urea from 81.5% to 26% for 30 days. Urea merupakan salah satu pupuk yang banyak digunakan dalam pertanian. Namun efisiensi penyerapan urea untuk tanaman saat ini hanya berkisar 30%. Oleh karena itu, untuk meningkatkan penyerapannya pada tanaman maka perlu dilakukan pengendalian pelepasan urea dengan membuatnya menjadi pupuk Slow Release Fertilizer (SRF). Penggunaan SRF diharapkan dapat mengendalikan pelepasan unsur nutrisi sesuai dengan waktu dan jumlah yang dibutuhkan tanaman. Bahan alami yang berpotensi sebagai matriks dari pupuk SRF ialah limbah ampas kopi. Penelitian ini menghasilkan karbon dari limbah ampas kopi yang dapat digunakan sebagai matrik dalam pembuatan pupuk SRF urea. Dengan penambahan matrik dari karbon kopi diharapkan dapat memperlambat laju pelepasan urea ke alam. Sehingga proses penyerapan urea ke dalam tumbuhan akan menjadi lebih maksimal. Ampas kopi dipirolisis dengan variasi suhu pirolisis (400 – 600oC) menggunakan ZnCl2 sebagai activator. Nilai iodine number karbon ampas kopi yang dihasilkan menurun dengan naiknya suhu. Penambahan karbon ampas kopi mampu menghambat pelepasan urea dari 81,5% menjadi 26% selama 30 hari. Prodi Teknik Kimia UPN "Veteran" Yogyakarta 2020-04-03 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article application/pdf https://jurnal.upnyk.ac.id/index.php/eksergi/article/view/3097 10.31315/e.v17i1.3097 Eksergi; Vol. 17 No. 1 (2020); 11-14 Eksergi; Vol 17 No 1 (2020); 11-14 2460-8203 1410-394X 10.31315/e.v17i1 ind https://jurnal.upnyk.ac.id/index.php/eksergi/article/view/3097/pdf Copyright (c) 2020 Eksergi

oai:jurnal.upnyk.ac.id:article/3098 2022-11-07T10:29:53Z eksergi:ART driver

Profil Release Enkapsulasi Antosianin, Flavonoid dan Fenolik pada Kulit Semangka Menggunakan Metode Spray Drying Kistriyani, Lilis Fauziyyah, Farah Rezeki, Sri Spray Drying Antosianin Flavonoid Fenolik Daerah Istimewa Yogyakarta merupakan salah satu daerah yang memiliki potensi bencana alam yang cukup tinggi. Makanan adalah bahan habis pakai yang paling dibutuhkan saat bencana alam terjadi. Untuk menjaga makanan bergizi yang akan didistribusikan ke korban bencana alam tetap layak untuk dimakan, diperlukan suatu adanya alternatif berupa pengawet alami makanan. Dalam penelitian ini, dipilih kulit semangka sebagai bahan untuk membuat pengawet alami karena mengandung flavonoid dan antosianin. Tujuan penelitian ini adalah untuk mengetahui banyaknya kandungan total antosianin, flavonoid dan fenolik pada kulit semangka merah serta mengetahui pengaruh komposisi kitosan terhadap kemampuan pelepasan antosianin, flavonoid dan fenolik pada makanan. Penelitian ini dilakukan dengan metode ekstraksi dan enkapsulasi. Pada proses enkapsulasi digunakan teknik spray drying. Analisa yang dilakukan antara lain pengujian analisis kandungan Total Antosianin (TA), Total Flavonoid (TF) dan Total Fenolik (TPC) di dalam supernatant, serta analisa uji in vitro (uji kemampuan pelepasan flavonoid dan fenolik) pada makanan. Kandungan total antosianin pada kulit semangka merah sebesar 0,1113 mg/L. Kandungan total flavonoid pada kulit semangka merah sebesar 0,6159 g/mL. Kandungan total fenolik kulit semangka merah sebesar 0,3410 g/mL. Pada uji in vitro untuk senyawa flavonoid maupun fenolik, terjadi ketidakstabilan pelepasan kadar flavonoid dan fenolik terhadap waktu pada variasi kitosan 0,4 gram, 0,5 gram, dan 0,6 gram. Namun dari hasil rata-rata pelepasan kadar flavonoid dan fenolik, yang paling tinggi terjadi pada variasi kitosan 0,6 gram, dengan masing-masing nilai yaitu untuk flavonoid 0,1172 gram/mL dan untuk fenolik 0,0867 gram/mL. Hal ini menunjukkan bahwa semakin tinggi kadar kitosan, maka pelepasan kadar flavonoid dan fenolik juga meningkat. Prodi Teknik Kimia UPN "Veteran" Yogyakarta 2020-12-11 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article application/pdf https://jurnal.upnyk.ac.id/index.php/eksergi/article/view/3098 10.31315/e.v17i2.3098 Eksergi; Vol. 17 No. 2 (2020); 33-38 Eksergi; Vol 17 No 2 (2020); 33-38 2460-8203 1410-394X 10.31315/e.v17i2 ind https://jurnal.upnyk.ac.id/index.php/eksergi/article/view/3098/pdf Copyright (c) 2020 Eksergi

oai:jurnal.upnyk.ac.id:article/3291 2022-11-07T10:30:19Z eksergi:ART driver

Reduction Nitrite Value in Water Using Activated Charcoal Moringa Seeds PENGGUNAAN SERBUK ARANG AKTIF BIJI KELOR UNTUK MENURUNKAN KADAR NITRIT DALAM AIR Mukaromah, Ana Hidayati Abja, Rusda Wardoyo, Fandhi Adi Nitrit Arang Aktif Biji Kelor Variasi Konsentrasi Variasi Lama Perendama Nitrite (NO2 - ) is a compound that can distrupting oxyhaemoglobin process and causes body weakness, fatigue, and samnolen. Either to reduce nitrite value in the water is to use activated charcoal moringa seeds, because it countains 4-alfa-L-rhamnosyloxy-benzilisothiocyanate substances. This research aims to find out influence of activated charcoal concentrate and immersion time variant to the reduction of nitrites ion in the water. Research object was nitrite ion in 10 ppm concentrate, the immersion with activated charcoal moringa seeds with concentrate variant 9 ; 12 ; and 15%w/v, with 10 ; 20 ; and 30 minutes immersion time. Nitrite assay performed with specfotometry methods with griess reagent. From the research results, optimum wave length is 540 nm and time stability of initial nitrite value 10 minutes with initial 4,7794 ppm. Reduction lowest nitrite value in the water is 9%w/v concentrate in 10 minutes time, with the result 3,1816 ppm and highest nitrite value is 15%w/v concentrate (1,1862 ppm). So that, can be conclude there is reaction activated charcoal moringa seeds variant concentration and immersion time to reducting nitrite ions in the water. Nitrit (NO2-) merupakan senyawa yang dapat mengakibatkan terganggunya proses pengikatan oksigen oleh haemoglobin darah sehingga tubuh menjadi lemas, penglihatan berkurang, mudah lelah, dan terasa kantuk. Salah satu cara untuk menurunkan kadar nitrit dalam air adalah dengan menggunakan arang aktif biji kelor, karena biji kelor mempunyai zat aktif 4-alfa-L-rhamnosyloxy-benzil-isothiocyanate. Penelitian ini bertujuan untuk mengetahui pengaruh variasi konsentrasi arang aktif biji kelor dengan variasi lama perendaman terhadap penurunan ion nitrit dalam air. Objek penelitian adalah larutan nitrit dengan konsentrasi 10 ppm, kemudian dilakukan perendaman menggunakan arang aktif biji kelor dengan variasi konsentrasi 9; 12; dan 15%b/v dengan variasi lama perendaman 10; 20; dan 30 menit. Penetapan kadar nitrit dilakukan dengan metode spektrofotometri dengan pereaksi gries. Dari hasil penelitian didapatkan panjang gelombang optimum adalah 540nm dan waktu kestabilan 10 menit dengan kadar nitrit awal 4,78 ppm. Penurunan kadar nitrit dalam air yang terendah pada konsentrasi 9%b/v dimenit 10 dimana hasilnya yaitu 3,18 ppm dan kadar nitrit tertinggi pada konsentrasi 15%b/v yaitu 1,1862ppm . Hasil uji statistik ada pengaruh variasi konsentrasi arang aktif biji kelor dengan variasi lama perendaman terhadap penurunan ion nitrit dalam air. Prodi Teknik Kimia UPN "Veteran" Yogyakarta 2020-04-03 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article application/pdf https://jurnal.upnyk.ac.id/index.php/eksergi/article/view/3291 10.31315/e.v17i1.3291 Eksergi; Vol. 17 No. 1 (2020); 28-32 Eksergi; Vol 17 No 1 (2020); 28-32 2460-8203 1410-394X 10.31315/e.v17i1 ind https://jurnal.upnyk.ac.id/index.php/eksergi/article/view/3291/pdf Copyright (c) 2020 Eksergi

oai:jurnal.upnyk.ac.id:article/3298 2022-11-07T10:30:19Z eksergi:ART driver

Enhancing coal tailing quality by Flotation Method using Biosurfactant from Lerak (Sapindusrarak De Candole) Jaya, Danang Widayati, Tunjung Wahyu Mustika, Refina Yuni Suwardi, Halim Nur Aziz coals tail lerak (biosurfactant) flotation particle size pH column diameter sulphur content ash content calorific value Wasted from coal mining that mixed with the wasted of the coal washing product called Coals Tailing (CT) has a low calorific value,high sulfur and ash content. To upgrade its quality by increasing its calorific value and to reduce environmental pollution by reducing sulfur and its ashes, coal must improve from its impurities, one of which is to try with flotation method. Flotation is a process that describes solids that occur due to differences in surface properties (surface properties). The flotation process takes place in a system consisting of three phases, namely gas phase, liquid, and solid, which are interrelated to complete the appearance (with the help of flotation agent  /  surfactant)  so  that  discussion  occurs  between  the  hydrophobic  component  (waterproof)  and  the hydrophilic component (like water). The main objective of the research is to improve the quality of coals tailing (CT), by increasing the calorific value (reducing the content of sulfur, ash, and other impurities) using the flotation method, and using lerak (Sapindus rarak De Candole) as a surfactant. From this research show that an optimal conditions were obtained, at particle size of -80 / + 100 mesh, operating conditions at pH 6, calorific value increased from initially 3230,171 cal/gr to 5035,622 cal/gr, sulfur content decreased according to   the optimum condition reached 2026.08 mg /kg, and the ash content decreased from 54.61% to 33.9%. From the results of these research indicate, Lerak as a surfactant is is enhanced to improve the quality of Tailings Coal (CT) by flotation method. Prodi Teknik Kimia UPN "Veteran" Yogyakarta 2020-04-03 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article application/pdf https://jurnal.upnyk.ac.id/index.php/eksergi/article/view/3298 10.31315/e.v17i1.3298 Eksergi; Vol. 17 No. 1 (2020); 20-27 Eksergi; Vol 17 No 1 (2020); 20-27 2460-8203 1410-394X 10.31315/e.v17i1 ind https://jurnal.upnyk.ac.id/index.php/eksergi/article/view/3298/pdf Copyright (c) 2020 Eksergi

oai:jurnal.upnyk.ac.id:article/3300 2022-11-07T10:30:19Z eksergi:ART driver

Steam Distillation of Essential Oil from Lemongrass (Cymbopogon citratus) using Microwave Pretreatment Murni, Ir., MT, Sri Wahyu Setyoningrum, Tutik Muji Haryono, Gogot serai dapur minyak atsiri hidrodestilasi microwave pretreatment Essential oils from lemongrass (Cymbopogon citratus) containing citral are very potential to be used in food and pharmacy industries. The process of isolating essential oils is still constrained by its low yield. In order to increase yield, in this research, isolation of essential oil by steam distillation method was carried out using microwave pretreatment. The results showed that pretreatment using microwave for 2 minutes had the effect of increasing yield up to 1.4 times compared to without pretreatment. The essential oil produced using microwave pretreatment had physical properties (colour, odor, density, and refractive index) similar to those without pretreatment. Composition analysis by GC-MS showed that essential oils extracted using microwave pretreatment and without pretreatment contain geranial (Ecitral or citral-a), neral (Z-citral or citral-b) and mircena as the main components. Prodi Teknik Kimia UPN "Veteran" Yogyakarta 2020-04-03 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article application/pdf https://jurnal.upnyk.ac.id/index.php/eksergi/article/view/3300 10.31315/e.v17i1.3300 Eksergi; Vol. 17 No. 1 (2020); 15-19 Eksergi; Vol 17 No 1 (2020); 15-19 2460-8203 1410-394X 10.31315/e.v17i1 eng https://jurnal.upnyk.ac.id/index.php/eksergi/article/view/3300/pdf Copyright (c) 2020 Eksergi

oai:jurnal.upnyk.ac.id:article/3691 2022-11-07T10:29:53Z eksergi:ART driver

Effect of the Phenol Concentration on the Phenol Photodegradation Effectivity using TitaniaCarbon Nanotube-cocoPAS Composite Pengaruh Konsentrasi Fenol terhadap Efektivitas Fotodegradasi Fenol menggunakan Komposit Titania-Carbon Nanotube (Surfaktan) Heltina, Desi Putri, Nadhia Gasani Utama, Panca Setia fotokatalisis degradasi komposit titania carbon nanotube fenol konsentrasi Aromatic compounds in industrial wastewater such as phenols can contribute as pollutants which are highly toxic and carcinogenic. Phenol degradation can be carried out by a photocatalytic process which can convert phenol into non-toxic and enviromentally friendly compounds. The performance of titania (TiO2) photocatalyst was enhanced by using carbon nanotube as a doping agent for titania. To reduce carbon nanotube agglomeration, the surface of carbon nanotube was modified with cocoPAS surfactant. The purpose of this study was to synthesize titania-carbon nanotube-cocoPAS composite and evaluated the effect of initial phenol concentration (10, 20, 30 ppm) on the phenol photodegradation effectivity using titania-carbon nanotube-cocoPAS composite. Titania-carbon nanotube-cocoPAS composite synthesis was carried out by forming a composite between TiO2 and carbon nanotube that had been modified by surfactant. Composite were characterized by SEM, FTIR, and XRD. Phenol photodegradation was carried out at a degradation temperature of 50ºC for 4 hours under UV light. Samples were drawn at regular intervals and residual concentration of phenol in each sample was analysed using UV-Visible spechtrophotometer. The highest degradation effectivity in 4 hours was 81% at initial phenol concentration of 10 ppm. Senyawa aromatik dalam limbah cair industri seperti fenol dapat berkontribusi sebagai polutan yang tinggi toksisitas dan karsinogeniknya. Degradasi fenol dapat dilakukan dengan proses fotokatalisis yang dapat mengubah fenol menjadi senyawa yang tidak beracun dan ramah lingkungan. Kinerja fotokatalis titania (TiO2) ditingkatkan dengan menggunakan carbon nanotube sebagai doping pada titania. Untuk mengurangi aglomerasi carbon nanotube, permukaan carbon nanotube dimodifikasi dengan surfaktan. Tujuan penelitian ini adalah membuat komposit titania-carbon nanotube (surfaktan) dan mengevaluasi pengaruh konsentrasi awal fenol (10, 20, 30 ppm) terhadap efektivitas fotodegradasi fenol menggunakan komposit titania-carbon nanotube (surfaktan). Sintesis komposit titania–carbon nanotube (surfaktan) dilakukan dengan membentuk komposit antara TiO2 dan carbon nanotube yang telah dimodifikasi oleh surfaktan. Hasil komposit dikarakterisasi menggunakan SEM, FTIR, dan XRD. Fotodegradasi fenol dilakukan pada suhu degradasi 50ºC selama 4 jam di bawah sinar UV. Sampel diambil dalam rentang waktu yang sama dan konsentrasi akhir fenol setiap sampel dianalisa menggunakan Spektrofotometer UV-Vis. Efektivitas degradasi yang paling tinggi diperoleh pada konsentrasi awal 10 ppm yaitu sebesar 81%. Prodi Teknik Kimia UPN "Veteran" Yogyakarta 2020-12-11 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article application/pdf https://jurnal.upnyk.ac.id/index.php/eksergi/article/view/3691 10.31315/e.v17i2.3691 Eksergi; Vol. 17 No. 2 (2020); 39-44 Eksergi; Vol 17 No 2 (2020); 39-44 2460-8203 1410-394X 10.31315/e.v17i2 ind https://jurnal.upnyk.ac.id/index.php/eksergi/article/view/3691/pdf Copyright (c) 2020 Eksergi

oai:jurnal.upnyk.ac.id:article/3700 2022-11-07T10:29:53Z eksergi:ART driver

Process Dynamic of Two-Thermal-Tank-Series with Dead Time Hermawan, Yulius Deddy Nandari, Wibiana Wulan Irfandy, Fauzan Rahmadi, Riski Ajin Perkasa, Aryandhanu Mukti Tri dead-time open loop step input TTTS Xcos The multi-tank-series system could come up the problem of instability due to dead-time. The goals of this work are to study the dynamic behavior of Two-Thermal-Tanks-Series (TTTS) with dead time through the open loop experiment in laboratory, and to propose the new-module of fundamental chemical engineering practicum in field of process dynamic for undergraduate program. The two stirred-tank-heaters @10L were designed for heating of water fluid. Both of tanks were designed overflow to maintain their volume constant. The gate valve was installed in the inlet pipe of Tank-1 to adjust its volumetric flowrate (f). The inlet temperature of Tank-1 (T1), the liquid temperatures in Tank-1 (T2) and Tank-2 (T3) were measured by thermocouple multi-channels. The volt-ampere-regulators were used to adjust the electrical energy in Tank-1 (q1) and Tank-2 (q2). The mathematical model was solved and rigorously examined in Xcos/Scilab. In order to study the dynamic behavior of TTTS, the inlet flowrate disturbance was made based on step input change. According to our investigation in laboratory and open loop simulation, both Tank-1 and Tank-2 gave stable responses, the model’s responses showed the closed and similar trend with laboratory’s responses, and time delay of about 30 seconds has been found in Tank-2. Prodi Teknik Kimia UPN "Veteran" Yogyakarta 2020-12-11 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article application/pdf https://jurnal.upnyk.ac.id/index.php/eksergi/article/view/3700 10.31315/e.v17i2.3700 Eksergi; Vol. 17 No. 2 (2020); 45-50 Eksergi; Vol 17 No 2 (2020); 45-50 2460-8203 1410-394X 10.31315/e.v17i2 eng https://jurnal.upnyk.ac.id/index.php/eksergi/article/view/3700/pdf Copyright (c) 2020 Eksergi

oai:jurnal.upnyk.ac.id:article/3703 2022-11-07T10:29:53Z eksergi:ART driver

Decreased Concentrations of Anion Phosphate and Sulphate in Wastewater of Xenotime Treatment Process Results using Electrocoagulation method Penurunan Konsentrasi Anion Fosfat dan Sulfat dalam Air Limbah Hasil Proses Pengolahan Senotim dengan Metode Elektrokoagulasi Rozana, Kharistya Prabasiwi, Devi Swasti Ariany, Dewi Puspa elektrokoagulasi variasi tegangan dan waktu kontak air limbah hasil proses senotim anion fosfat dan sulfat Indonesia has rare earth mineral resources that have the potential to be processed into beneficial products for human life. In the processing of rare earth mineral resources rarely needed waste treatment devices to reduce contaminants in liquid waste process results. The method of processing with the electrocoagulator system is used because its does not require high levels of technology and costs. In research conducted wastewater treatment process results of xenotime by using method of electrocoagulation with variation of voltage and time of contact. Digestion of xenotime sand using concentrated sulfuric acid and in the content of xenotime sand there is a phosphate anion that binds with metal Y, Dy, Gd, La, Ce, Nd. Xenotime wastewater treatment process with electrocoagulation method is set at voltage variation 7V-13V with variation time of 0-120 minutes. The results of analysis with High Performance Liquid Chromatography (HPLC) showed that there is a decrease in the concentration of phosphate and sulfate anions in the filtrate of the processing results of xenotime wastewater using electrocoagulation method. The lowest concentrations of phosphate and sulfate anions occur in the 13 V voltage condition with 120 minutes of 1.180% and 0.564%. Indonesia memiliki sumber daya mineral logam tanah jarang yang berpotensi untuk diolah menjadi produk yang bermanfaat untuk kehidupan manusia dan bernilai ekonomis tinggi.  Didalam pengolahan sumber daya mineral logam tanah jarang diperlukan perangkat pengolahan limbah untuk mereduksi kontaminan dalam limbah cair hasil proses, perangkat pengolahan limbah dikembangkan sesuai kebutuhan teknis berdasarkan aspek teknologi dan biaya. Proses pengolahan limbah cair di lingkungan industri kimia saat ini selain masih terpaku pada teknologi yang tersedia, dan membutuhkan bahan kimia pendukung proses pengolahan dengan biaya tinggi. Metode pengolahan dengan sistem elektrokoagulator digunakan karena teknologi elektrokoagulasi tidak membutuhkan tingkat teknologi dan biaya tinggi. Pada penelitian ini dilakukan pengolahan air limbah hasil proses senotim dengan menggunakan metode elektrokoagulasi dengan variasi tegangan dan waktu kontak. Dijesti pasir senotim menggunakan asam sulfat pekat dan di dalam kandungan pasir senotim terdapat anion fosfat yang berikatan dengan logam Y, Dy, Gd, La, Ce, Nd. Proses pengolahan limbah senotim dengan metode elektrokoagulasi diatur pada variasi tegangan 7V-13V dengan waktu 0-120 menit. Hasil analisis dengan HPLC menunjukkan adanya penurunan kadar anion fosfat dan sulfat di dalam filtrat hasil pengolahan limbah senotim dengan menggunakan metode elektrokoagulasi. Konsentrasi anion fosfat dan sulfat terendah terjadi pada kondisi tegangan 13 V dengan waktu 120 menit yaitu 1,18% dan 0,564% dari konsentrasi anion fosfat dan sulfat mula-mula 11,469% dan 0,991% Prodi Teknik Kimia UPN "Veteran" Yogyakarta 2020-12-14 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article application/pdf https://jurnal.upnyk.ac.id/index.php/eksergi/article/view/3703 10.31315/e.v17i2.3703 Eksergi; Vol. 17 No. 2 (2020); 51-55 Eksergi; Vol 17 No 2 (2020); 51-55 2460-8203 1410-394X 10.31315/e.v17i2 ind https://jurnal.upnyk.ac.id/index.php/eksergi/article/view/3703/pdf_1 Copyright (c) 2020 Eksergi

oai:jurnal.upnyk.ac.id:article/3714 2022-11-07T10:29:53Z eksergi:ART driver

The Growth Mechanisms of Atomic Layer Deposition: An Overview Riyanto, Edy Martides, Erie Junianto, Endro Prawara, Budi atomic layer deposition growth mechanism thin film In this review, the discussion emphasized on the growth mechanisms of atomic layer deposition which consists of a theoretical model and experimentally growth as well as the measurement testing as evidences. The deposition process description with some testing evidences can be used to facilitate in the effort to understand the basic concept of ALD growth mechanisms. Some metal oxides like Al2O3, HfO2, and TiO2 with these employed precursors are typically used for the detailed illustration during the reaction steps. Although the surface chemistry of ALD process has been well understood, systematic description which combine a theoretical and experimentally growth mechanism is still missing. This paper aims to provide a better understanding of ALD growth mechanisms and surface chemistry which eventually able to contribute on the thin film growth processing. Prodi Teknik Kimia UPN "Veteran" Yogyakarta 2020-12-11 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article application/pdf https://jurnal.upnyk.ac.id/index.php/eksergi/article/view/3714 10.31315/e.v17i2.3714 Eksergi; Vol. 17 No. 2 (2020); 56-61 Eksergi; Vol 17 No 2 (2020); 56-61 2460-8203 1410-394X 10.31315/e.v17i2 eng https://jurnal.upnyk.ac.id/index.php/eksergi/article/view/3714/pdf Copyright (c) 2020 Eksergi

oai:jurnal.upnyk.ac.id:article/3718 2022-11-07T10:29:53Z eksergi:ART driver

Identification of The Presence of Water in The Production Fluid Distribution Process in the Offshore Oil Field Identifikasi Keberadaan Air pada Proses Penyaluran Fluida Produksi di Lapangan Minyak Lepas Pantai Hariyadi, Hariyadi Kristanto, Dedy Hermawan, Yulius Deddy Kadar air BS&W produksi minyak produksi air Oil production that flows from the Platform to the FSO (Floating Storage and Offloading) "A" is derived from PT. "B" and the "C" Oil Company in the Madura Strait. The total oil production flowing from the Platform to the "A" FSO is currently around 6000 BOPD. As a result of the delivery system using the same channel, a problem arises, namely oil losses between the Platform as a delivery point and FSO "A" as a receiving point. Besides that, the water that is involved in the oil distribution process will be a deduction factor that will be used as a correction for oil shipments, the more water the less amount of oil will be received at FSO "A". The oil samples that have been taken are then observed for their characteristics, namely density, composition (%-mole), BS&W, emulsion, flash, shrinkage at PPPTMGB "Lemigas" Laboratory Jakarta. The specific gravity of samples is around 1,018. While the characteristics of the two are different from the characteristics of sea water; this difference is shown by the results of SG (1,018 vs 1,025) and the salt content of sea water is much higher than the water formation of PT "B" and PT "C". The oil samples of PT "B" and PT "C" have almost the same SG, which is 0.79. BS&W oil in both ships is quite low; this shows that the separation of oil and water on the Platform went quite well. However, BS&W samples in incoming FSO "A" are very high, at 5%; this indicates an off-set at the water-oil interface level settling time on the Platform separator so that water can be joined with the oil flow from the Platform to the FSO "A" Produksi minyak yang mengalir dari Anjungan menuju FSO (Floating Storage and Offloading) "A" berasal dari PT. Perusahaan Minyak "B" dan "C" di Selat Madura. Total produksi minyak yang mengalir dari anjungan ke FSO "A" saat ini sekitar 6000 BOPD. Akibat sistem pengiriman yang menggunakan saluran pipa yang sama maka timbul masalah yaitu kehilangan minyak antara Platform sebagai titik pengiriman dan FSO "A" sebagai titik penerima. Selain itu, air yang ikut dalam proses distribusi minyak akan menjadi faktor pengurang yang akan digunakan sebagai koreksi pengiriman minyak, semakin banyak air semakin sedikit jumlah minyak yang akan diterima di FSO "A". Sampel minyak yang telah diambil kemudian diamati karakteristiknya yaitu densitas, komposisi (% mole), BS&W, emulsi, flash, dan penyusutan yang diuji di  Laboratorium PPPTMGB "Lemigas" Jakarta. Berat jenis sampel sekitar 1.018, dan keduanya sangat berbeda dengan berat jenis air laut; Perbedaan ini ditunjukkan oleh hasil SG (1.018 vs 1.025) dan kadar garam air laut jauh lebih tinggi dibandingkan air formasi PT "B" dan PT "C". Sampel minyak dari PT "B" dan PT "C" memiliki SG yang hampir sama, yaitu 0.79. Kadar BS&W pada kedua produsen minyak cukup rendah; Hal ini menunjukkan bahwa pemisahan minyak dan air di Anjungan berjalan cukup baik. Namun, sampel BS&W di FSO "A" yang masuk sangat tinggi, yaitu lebih dari 5%; ini menunjukkan off-set pada pengaturan level antarmuka air-minyak pada separator sehingga air dapat menambah jumlah volume aliran minyak dari Platform ke FSO "A" Prodi Teknik Kimia UPN "Veteran" Yogyakarta 2020-12-11 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article application/pdf https://jurnal.upnyk.ac.id/index.php/eksergi/article/view/3718 10.31315/e.v17i2.3718 Eksergi; Vol. 17 No. 2 (2020); 62-67 Eksergi; Vol 17 No 2 (2020); 62-67 2460-8203 1410-394X 10.31315/e.v17i2 ind https://jurnal.upnyk.ac.id/index.php/eksergi/article/view/3718/pdf Copyright (c) 2020 Eksergi

oai:jurnal.upnyk.ac.id:article/3729 2022-11-07T10:29:53Z eksergi:ART driver

Preparation and Characterization of sPEEK-PVA Composite Membranes with Graphene Oxide as filler for Direct Methanol Fuel Cells Pembuatan dan Karakterisasi Membran Komposit sPEEK-PVA dengan Bahan Isian Grafena Oksida untuk Sel Bahan Bakar Methanol Nastiti, Elisa Putri Hidayati, Nur DMFC membran komposit sPEEK PVA Grafena Oksida Direct Methanol Fuel Cell (DMFC) is a fuel cell technology that convert chemical energy into electrical energy directly. Sulfonated polyether ether ketones (sPEEK) have potential as proton exchange membranes. Modification of sPEEK with poly vinyl alcohol (PVA) and adding graphene oxide (GO) is expected to reduce methanol cross over. This study was designed to examine the characteristics of the sPEEK-PVA composite membrane using the independent variable variation of GO 2.5-10% w/w. The results showed that water uptake in the range of 20-33%, swelling degree in the range of 10-17.5%, the ion exchange capacity was 0.59-0.75 meq/g, and the methanol permeability was 2.82-4.2 x10-6 cm2 /s. The characters shown are comparable with Nafion's characters and have the potential to be developed because they are superior in terms of raw material prices Direct Methanol fuel Cell (DMFC) merupakan teknologi sel bahan bakar yang mengubah energi kimia menjadi energi listrik secara langsung. Polieter eter keton tersulfonasi (sPEEK) berpotensi sebagai proton exchange membrane. Modifikasi sPEEK dengan poli vinil alkohol (PVA) dan penambahan grafena oksida (GO) diharapkan dapat mengurangi methanol cross over. Penelitian dirancang untuk mengkaji karakteristik membran komposit sPEEK-PVA dengan menggunakan variabel bebas variasi GO 2,5-10% w/w. Hasil pengujian menunjukkan water uptake pada rentang  20-33% swelling degree pada rentang 10-17.5%,, kapasitas penukar ion sebesar 0.59-0.75 meq/g, dan permeabilitas metanol sebesar 2.82 – 4.2 x10-6cm2/s. Karakter yang ditunjukkan sepadan dengan karakter Nafion dan berpotensi untuk dikembangkan karena lebih unggul dalam hal harga bahan bakunya. Prodi Teknik Kimia UPN "Veteran" Yogyakarta 2020-12-11 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article application/pdf https://jurnal.upnyk.ac.id/index.php/eksergi/article/view/3729 10.31315/e.v17i2.3729 Eksergi; Vol. 17 No. 2 (2020); 68-72 Eksergi; Vol 17 No 2 (2020); 68-72 2460-8203 1410-394X 10.31315/e.v17i2 ind https://jurnal.upnyk.ac.id/index.php/eksergi/article/view/3729/pdf Copyright (c) 2020 Eksergi

oai:jurnal.upnyk.ac.id:article/3730 2022-11-07T10:29:53Z eksergi:ART driver

Influence of Particle Size and Chemical Activation on Rice Husk Biochar as Slow Release Fertilizer Akhwan, Natasha Amelia Rigitha Yuliestyan, Avido (biochar spectrophotometer chemical activator slow-release fertilizer leaching) Nitrogen, Phosphate, and Potassium are important nutritional elements contained in the fertilizers for plants but their presence in the soil could be easily wash out by rain water. Biochar, originated from rice husks with a high absorbance ability, might be able to be used to inhibit the release of those nutrients. This research aims to investigate the influence of biochar size and the HCl chemical activation. Biochar, which has been pyrolyzed, was ground and sieved to obtain powder with the size average equivalent to 0.2735 mm; 0.4485 mm; 0.725mm; and 0.925 mm. The optimized biochar size were opted for later being activated using HCl with a concentration of 3%; 9%; and 15%. The leaching process of fertilizer, aiming to imitate the rain water washing, was performed by pouring water on a daily basis on a sand column with the presence of biochar saturated with colorized fertilizer. The obtained solution were then characterized using Spectrophotometer. The results show that the estimated release time for the case with the absence of biochar is 36 days, in contrast to 55 days for the case with the presence of biochar.  Prodi Teknik Kimia UPN "Veteran" Yogyakarta 2020-12-11 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article application/pdf https://jurnal.upnyk.ac.id/index.php/eksergi/article/view/3730 10.31315/e.v17i2.3730 Eksergi; Vol. 17 No. 2 (2020); 73-78 Eksergi; Vol 17 No 2 (2020); 73-78 2460-8203 1410-394X 10.31315/e.v17i2 eng https://jurnal.upnyk.ac.id/index.php/eksergi/article/view/3730/pdf Copyright (c) 2020 Eksergi

oai:jurnal.upnyk.ac.id:article/3732 2022-11-07T10:29:53Z eksergi:ART driver

Kinetics of Ion Reduction of Copper from Electroplating Waste by using Electrocoagulation Kinetika Reaksi Reduksi Ion Logam Tembaga pada Limbah Industri Elektroplating dengan Proses Elektrokoagulasi Erawati, Emi Marfiana, Kesi elektroplating limbah cair elektrokoagulasi tembaga The electroplating process not only produces useful products but also produces waste. Copper is one of the elements contained in waste. Waste containing copper has a major impact on the environment and human health if there is no prior treatment. One way to reduce copper levels in electroplating waste is the electrocoagulation process. This study aims to investigate the efficiency of reducing the concentration of waste at various concentrations and types of electrodes and to determine the reaction rate constants of the first and second order reactions. 60, 80 and 100 mL electroplating waste were diluted with distilled water in a 500 mL measuring flask. The two plates were clamped using a statif and a 3/4 plate immersed in wastewater. The cathode and anode are connected to a 12 volt power supply with a distance between the electrodes of 2 cm and a stirring speed of 200 rpm. Samples were taken every 0; 40; 80; 120; and 160 minutes to test Cu content with AAS. Repeating the same steps for various types of electrodes, namely Al, Fe, and CuZn. The highest efficiency at various concentrations of 80 mg/L and types of electrodes of Fe were 67.66% and 92.82% in that order. The rate constants of the first and second order reactions are 0.0096 s-1 and 0.0058 ppm1 .s-1 respectively Penyebab terjadinya pencemaran adalah banyaknya limbah yang dibuang ke lingkungan tanpa melalui  pengolahan terlebih dahulu atau limbah yang sudah diolah tetapi tidak memenuhi standar yang telah ditetapkan. Proses elektroplating selain menghasilkan produk yang berguna juga menghasilkan limbah. Tembaga merupakan salah satu unsur yang terkandung didalam limbah. Limbah yang mengandung tembaga berdampak besar bagi lingkungan dan kesehatan manusia jika tidak ada pengolahan sebelumnya. Salah satu cara untuk menurunkan kadar tembaga pada limbah elektroplating yaitu dengan proses elektrokoagulasi. Proses elektrokoagulasi adalah metode pengolahan air dimana koagulan dihasilkan secara elektrik dan air limbah diolah dalam sel elektrokimia. Penelitian ini bertujuan untuk mengetahui efisiensi penurunan konsentrasi limbah pada variasi konsentrasi dan jenis elektroda serta mengetahui konstanta laju reaksi reaksi orde satu dan dua. Variabel yang digunakan dalam penelitian ini adalah jenis elektroda yaitu plat alumunium (Al), kuningan, dan besi (Fe), dan konsentrasi limbah (60,80,100 mg/L). Sampel dianalisis menggunakan Atomic Absorption Spectroscopy (AAS). Efisiensi tertinggi pada variasi konsentrasi dan jenis elektroda sebesar 67,66% pada konsentrasi limbah 80 mg/L dan 92,82% pada plat besi (Fe). Konatanta lau reaksi pertama dan kedua adalah 0,0096 dengan R2 sebesar 0,9735 dan 0,0058 dengan R2 0,946 . Prodi Teknik Kimia UPN "Veteran" Yogyakarta 2020-12-11 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article application/pdf https://jurnal.upnyk.ac.id/index.php/eksergi/article/view/3732 10.31315/e.v17i2.3732 Eksergi; Vol. 17 No. 2 (2020); 93-98 Eksergi; Vol 17 No 2 (2020); 93-98 2460-8203 1410-394X 10.31315/e.v17i2 ind https://jurnal.upnyk.ac.id/index.php/eksergi/article/view/3732/pdf Copyright (c) 2020 Eksergi

oai:jurnal.upnyk.ac.id:article/3733 2022-11-07T10:29:53Z eksergi:ART driver

Biogas Production from Vegetables and Fruit Wastes Using Anaerobic Floating Bioreactor soeprijanto, soeprijanto Fatullah, Anfi Reynikha Agustina, Sashi Amalia, Dyah Firdha Kaisar, Alif Adi Biogas bioreactor HRT OLR vegetable waste fruit waste Markets and supermarkets are one of the pillars of the country's economy, besides that, they are also the biggest contributors to vegetable and fruit waste which can cause various environmental problems. Therefore, the abundance of vegetable and fruit waste produced by markets and supermarkets can be utilized as environmentally friendly alternative energy, namely biogas. This study aimed to determine the effect of organic loading rate (OLR) on biogas production and gas composition in a continuous anaerobic floating bioreactor using mixed vegetable and fruit waste. A 40-l anaerobic floating bioreactor was utilized and the hydraulic retention time was 10 days; one kg of vegetable and fruit wastes at a 1:1 mass ratio was added with water to 4 l and introduced during 25 days; the daily biogas production was collected in a floating drum and measured as volume. The maximum biogas yield was 0.0452 m3/kg, achieved using the OLR of 0.0125 kg/l.day.  The use of OLR of 0.0250, 0.0375 and 0.0500 kg/l.d reached biogas yields of 0.0435, 0.0282, and 0.0163 m3/kg, respectively. The composition of the maximum biogas yield was 68.17% CH4, 19.34% CO2, 1.85% H2S, and 0.64% NH3.  Prodi Teknik Kimia UPN "Veteran" Yogyakarta 2020-12-14 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article application/pdf https://jurnal.upnyk.ac.id/index.php/eksergi/article/view/3733 10.31315/e.v17i2.3733 Eksergi; Vol. 17 No. 2 (2020); 99-104 Eksergi; Vol 17 No 2 (2020); 99-104 2460-8203 1410-394X 10.31315/e.v17i2 eng https://jurnal.upnyk.ac.id/index.php/eksergi/article/view/3733/pdf Copyright (c) 2020 Eksergi

oai:jurnal.upnyk.ac.id:article/3758 2022-11-07T10:29:53Z eksergi:ART driver

Bioceramic Hydroxiapatite (HAp) Made From Anodonta nuttaliana Clams Shells from Poso Lake Biokeramik Hidroksiapatit (HAp) Berbahan Dasar Cangkang Tiram Anodonta nuttaliana dari Danau Poso Gintu, Agung Rimayanto Kristiani, Elizabeth Betty Elok Martono, Yohanes Biokeramik Cangkang Hidroksiapatit Jaringan Keras Bioceramic Hydroxyapatite (HAp) was a derivated chemical synthetic compound from calcium phosphate commonly used to care the damage of hard tissues. Bioceramic Hydroxyapatite can synthetized from the compounds which rich with calcium contains. In this study threated the synthesis and physicochemical characterization to the HAp made from Anodonta nuttaliana clam shells obtained from Poso lake. From the characterization of the sample A. nuttaliana shells obtained the water contains 0,50±0,00%; ash contains 0,9827±0,0022g/g; potasium 0,00135±0,0002g/g; calcium 0,0165±0,0034g/g; phosphate 0,1920±0,0424g/g and the ratio of Ca/P 1,9389±0,3039%. The synthesis of HAp by base precipitation method showed the yield of synthesis 95,4320±0,7085% with the characteristic of the HAp showed that the potassium contains 0,0005±0,00004g/g; calcium 0,95476±0,0012g/g; phosphate 0,528±0,0075; ratio of Ca/P 1,0307±0,0932%; porosity 73,9598±1,1320%; swelling ability 9,6067±2,5365%; and biodegradability 8,8206±0,2176%. From the overall results concluded that the A. nuttaliana clam shells was very potential to became a source of Bioceramic Hydroxyapatite (HAp). Biokeramik Hidroksiapatit (HAp) merupakan suatu komponen kimiawi sintetik dari turunan kalsium fosfat yang umumnya digunakan untuk memperbaiki kerusakan jaringan keras. Biokeramik Hidroksiapatit dapat disintesis dari bahan-bahan yang kaya akan kalsium. Pada penelitian ini dilakukan sintesis dan karakterisasi fisikokima HAp dari cangkang tiram Anodonta nuttaliana yang diperoleh dari danau Poso, Sulawesi tengah. Dari hasil karakterisasi sampel cangkang tiram A. nuttaliana diperoleh kadar air 0,50±0,00%; kadar abu 0,9827±0,0022g/g; kadar kalium 0,00135±0,0002g/g; kalsium 0,0165±0,0034g/g; fosfat 0,1920±0,0424g/g dan rasio Ca/P 1,9389±0,3039%. Sintesis HAp dengan metode pengendapan basa menunjukkan yield sintesis sebesar 95,4320±0,7085% dengan karakteristik HAp yang dihasilkan menunjukkan kadar kalium 0,0005±0,00004g/g; kalsium 0,9476±0,0012g/g; fosfat 0,528±0,0075; rasio Ca/P 1,0307±0,0932%; porositas 73,9598±1,1320%; daya kembang 9,6067±2,5365%; dan biodegradabilitas 8,8206±0,2176%. Dari keseluruhan hasil disimpulkan bahwa cangkang tiram A. nuttaliana sangat potensial untuk dijadikan sumber biokeramik hidroksiapatit (HAp). Prodi Teknik Kimia UPN "Veteran" Yogyakarta 2020-12-11 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article application/pdf https://jurnal.upnyk.ac.id/index.php/eksergi/article/view/3758 10.31315/e.v17i2.3758 Eksergi; Vol. 17 No. 2 (2020); 86-92 Eksergi; Vol 17 No 2 (2020); 86-92 2460-8203 1410-394X 10.31315/e.v17i2 ind https://jurnal.upnyk.ac.id/index.php/eksergi/article/view/3758/pdf Copyright (c) 2020 Eksergi

oai:jurnal.upnyk.ac.id:article/3828 2022-11-07T10:29:53Z eksergi:ART driver

POST-COMBUSTION COAL DESULFURIZATION Review Yuniar, Silky Amanda Nursanto, Edy Ernawati, Rika acid rains coal desulfurizization electrochemical desulfurization The sulfur content in coal ranges from 0.5 to 5%, and it is an impurity that must be removed before burning coal, due to the toxic effects and acid rain caused by SO2 gas generated from sulfur oxidation. Sulfur cleaning technology can be carried out on coal before combustion (pre-combustion), and can reduce the inorganic sulfur content by up to 50%; however, it cannot reduce the organic sulfur content. Therefore, the industry relies on post-combustion desulfurization to remove SO2 from the gas from coal combustion. The aim of the coal desulfurization review is to direct desulfurization research to be efficient and effective, as well as to be environmentally friendly. Sulfur in coal consists of organic sulfur and inorganic sulfur. Coal inorganic sulfur consists of pyrite (FeS2), sulfate, and sulfide. The largest composition is pyrite. Organic sulfur consists of hetero-atomic and heterocyclic (thiophenic) macromolecules that bind N and O atoms, aromatic sulfides, and aromatic disulfides (small amounts). Inorganic sulfur can easily be separated from coal by means of flotation, microwave energy, magnetic forces, ultrasonic energy, and as well as microorganisms. Meanwhile, organic sulfur cannot be separated from coal by using the methods used in the inorganic sulfur separation process. Organic sulfur can be removed by chemical and biodesulfurization, however, this process is inefficient for industrial scale. The most recommended method is the absorption of SO2 gas in the gas from coal combustion, or post-combustion desulfurization. Various methods have also been investigated to separate SO2 gas, and more details will be described in this paper. Prodi Teknik Kimia UPN "Veteran" Yogyakarta 2020-12-11 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article application/pdf https://jurnal.upnyk.ac.id/index.php/eksergi/article/view/3828 10.31315/e.v17i2.3828 Eksergi; Vol. 17 No. 2 (2020); 79-85 Eksergi; Vol 17 No 2 (2020); 79-85 2460-8203 1410-394X 10.31315/e.v17i2 eng https://jurnal.upnyk.ac.id/index.php/eksergi/article/view/3828/pdf Copyright (c) 2020 Eksergi

oai:jurnal.upnyk.ac.id:article/4497 2022-11-07T10:15:39Z eksergi:ART driver

Optimization of Coagulant Dosage for Suko River Water Treatment aini, syarifah Wahyudi, H.D. Priyono, Kukuh Jar Test tawas PAC kaporit kejernihan Sungai Suko, Drono village, Ngawen sub-district, Klaten district, is located near residential area and tofu factory, the possibility of water contamination is quite high, which is caused by household waste. This river water can be processed into clean water by a coagulation process of the Jar Test method using coagulant alum, PAC and chlorine. The purpose of this study was to determine the optimum dose of coagulant in processing Suko river water into clean water using the Jar test method and knowing which coagulant is most suitable for processing the Suko river water into clean water. This research method is to use the Jar Test experiment to determine the optimum coagulant dose in processing Suko river water into clean water. The quality of the water samples before the experiment were tested which included the physical parameters, i.e. temperature, color, odor, and turbidity, also the chemical parameters, i.e. Fe, hardness, CO2, alkalinity, pH, COD, BOD, then the experimental results will determine the level of water clarity. The results showed that the optimum alum content in the experiment was 120 ppm by adding 6 mL of alum to 500 mL of water, the optimum level of PAC in the experiment is 200 ppm by adding 10 mL of PAC to 500 mL of water, and the optimum chlorine level in the experiment is 160 ppm by adding 8 mL of chlorine to 500 mL of water. Prodi Teknik Kimia UPN "Veteran" Yogyakarta 2021-04-23 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article application/pdf https://jurnal.upnyk.ac.id/index.php/eksergi/article/view/4497 10.31315/e.v0i0.4497 Eksergi; Vol. 18 No. 1 (2021); 1-6 Eksergi; Vol 18 No 1 (2021); 1-6 2460-8203 1410-394X 10.31315/e.v0i0 eng https://jurnal.upnyk.ac.id/index.php/eksergi/article/view/4497/pdf Copyright (c) 2021 Eksergi

oai:jurnal.upnyk.ac.id:article/4534 2022-11-07T10:15:39Z eksergi:ART driver

Inventory of Greenhouse Gas Emissions in the Waste Sector with First Order Decay in Karangasem Regency INVENTARISASI EMISI GAS RUMAH KACA SEKTOR LIMBAH DENGAN FIRST ORDER DECAY DI KABUPATEN KARANGASEM Fauziawan, Affan Irfan Waste production increases with the increase in population, urbanization rate and people's income. Garbage is a contributor to greenhouse gas (GHG) emissions which can cause global warming. The Indonesian government is still committed to reducing greenhouse gas emissions and working to reduce / limit the increase in temperature below 1.50C. Karangasem Regency, is on the island of Bali, with a population in 2018 of 414,800 people. The population is spread across 8 sub-districts with the population growth rate in Karangasem averaging 0.88% per year. The distribution of the population will be directly proportional to the distribution of solid waste produced. It is important to do an inventory of GHG emissions to determine the amount of emissions in Karangasem Regency. The method for calculating municipal solid waste will be carried out using the First Order Decay method contained in the IPCC (Intergovernmental Panel on Climate Change) Guidelines. From the calculation results, GHG emissions have been obtained in each sub-district in Karangasem Regency. Total GHG emissions in 2019 amounted to 11,764 tons CO2-e, with the highest GHG emission contributor, namely Karangasem District with 2,302 tons CO2-e and the lowest being Sidemen District with 894 tons CO2-e. With this research, it is hoped that stakeholders will be able to make efforts (mitigation) that can reduce these GHG emissions. Produksi limbah meningkat seiring dengan meningkatnya jumlah penduduk, tingkat urbanisasi dan pendapatan masyarakat. Sampah merupakan salah satu penyumbang emisi gas rumah kaca (GRK) yang dapat menyebabkan adanya pemanasan global (global warming). Pada Conference of Parties 25 (COP 25) di Madrid tahun 2019, pemerintah Indonesia masih berkomitmen untuk dapat menurunkan emisi gas rumah kaca dan berupaya untuk mengurangi/membatasi peningkatan suhu dibawah 1,50C. Kabupaten Karangasem, merupakan daerah yang berada di belahan timur Pulau Bali, yang secara administratif merupakan salah satu kabupaten dalam wilayah Provinsi Bali. Jumlah penduduk Kabupaten Karangasem pada tahun 2018 berdasarkan hasil registrasi penduduk adalah 414.800 jiwa. Jumlah penduduk tersebut tersebar dalam 8 kecamatan dengan angka pertambahan  penduduk di Karangasem rata-rata 0,88% per tahun. Sebaran jumlah penduduk akan berbanding lurus dengan sebaran limbah padat yang dihasilkan. Metode penghitungan limbah padat kota akan dilakukan dengan menggunakan metode First Order Decay yang terdapat pada IPCC (Intergovernmental Panel on Climate Change) Guidelines.  Dari hasil perhitungan telah didapatkan emisi GRK di tiap-tiap kecamatan yang ada di Kabupaten Karangasem. Total emisi GRK pada tahun 2019 yaitu sebesar 11.764 ton CO2-e, dengan penyumbang emisi GRK tertinggi yaitu Kecamatan Karangasem sebesar 2.302 ton CO2-e dan yang terendah yaitu kecamatan Sidemen sebesar 894 ton CO2-e.Kata Kunci : Limbah, Emisi, Gas Rumah Kaca, First Order Decay, IPCC. Prodi Teknik Kimia UPN "Veteran" Yogyakarta 2021-05-03 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article application/pdf https://jurnal.upnyk.ac.id/index.php/eksergi/article/view/4534 10.31315/e.v0i0.4534 Eksergi; Vol. 18 No. 1 (2021); 18-23 Eksergi; Vol 18 No 1 (2021); 18-23 2460-8203 1410-394X 10.31315/e.v0i0 ind https://jurnal.upnyk.ac.id/index.php/eksergi/article/view/4534/pdf Copyright (c) 2021 Eksergi

oai:jurnal.upnyk.ac.id:article/4536 2023-01-15T05:33:09Z eksergi:ART driver

Study of the activity of activated carbon impregnated with Fe2O3 as a biosorbent for methylene blue from wastewater Uji Aktivitas Karbon Aktif Tongkol Jagung Terimpregnasi Fe2O3 sebagai Biosorben Limbah Warna Metilen Blue Irfandy, Fauzan Ristianingsih, Yuli Istiani, Alit Methylene blue is one of dying waste that causes harmful effect both enviromental and public health risks. A method to overcome the problem is to adsorb it with the activated carbon. Apart from that, corn cob is potential biomass with can convert to activated carbon. The aim of this research is to syntethic and to modify corn cob activated carbon with iron oxide. It is expected to increase the afinity of methylene blue to the activated carbon surface. The modification is done by wet impregnation and the effectiveness of the impregnated corn cob activated carbon is studied by analyse the persen removal of methylene blue in every interval time. The result show that in the concentration range of Fe load impregnation between 1%-3% which has been used, the corn cob activated carbon with concentration of Fe load 2% has the most optimum ability in methylene blue adsorption with the adsorption capacity 44,9%. Moreover, the effect pH shows that in acidic condition the adsorption of methylen blue is better than in netral condition Salah satu limbah warna yaitu metilen blue dapat memberikan dampak yang buruk terhadap lingkungan dan kesehatan. Salah satu upaya mengatasinya adalah dengan proses adsorpsi dengan karbon aktif. Biomasa yang potensial dikembangkan sebagai karbon aktif adalah tongkol jagung karena ketersediaanya yang melimpah. Tujuan dari penelitian ini adalah membuat karbon aktif dari tongkol jagung dan memodifikasi permukaanya dengan besi oksida (Fe2O3). Modifikasi ini dilakukan dengan tujuan karbon aktif terimpregnasi dapat memiliki daya tarik atau afinitas yang lebih baik terhadap metilen blue. Proses modifikasi dilakukan dengan wet impregnation method. Hasil dari karbon aktif terimpregnasi oksida besi (KAJ-Fe) kemudian diuji aktivitasnya terhadap metilen blue. Selain itu, pengaruh Ph pun ikut dipelajari dalam penelitian ini. Berdasarakan percobaan yang telah dilkukan terlihat bahwa pada range konsentrasi loading Fe yang digunakan (1-3%) menunjukkan bahwa Loading Fe dengan konsentrasi 2% memberikan hasil adsorpsi metilen blue yang paling optimal dimana kapasitas adsorpsinya sebesar 44.9%. Selain itu, pH asam pada metilen blue memberikan hasil adsorpsi yang lebih baik daripada Ph netral. Prodi Teknik Kimia UPN "Veteran" Yogyakarta 2021-11-01 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article application/pdf https://jurnal.upnyk.ac.id/index.php/eksergi/article/view/4536 10.31315/e.v0i0.4536 Eksergi; Vol. 18 No. 2 (2021); 89-92 Eksergi; Vol 18 No 2 (2021); 89-92 2460-8203 1410-394X 10.31315/e.v18i2 ind https://jurnal.upnyk.ac.id/index.php/eksergi/article/view/4536/pdf Copyright (c) 2021 Eksergi

oai:jurnal.upnyk.ac.id:article/4551 2022-11-07T10:15:39Z eksergi:ART driver

Pretreatment Spirulina platensis Residue untuk Produksi Bioetanol Anggorowati, Heni Lestari, Indriana Budiman, Arief Pradana, Yano Surya spirulina platensis residue ultasonikasi autoclave α-amylase amyloglucosidase Pemerintah Indonesia berusaha untuk menggurangi penggunaan bahan bakar fosil dengan mendorong adanya transisi ke sumber energi terbarukan. Bioetanol merupakan salah satu alternatif energi terbarukan yang mampu mengurangi penggunaan bensin di sektor transportasi. Bioetanol dapat diproduksi dari spirulina platensis residu (SPR) yang masih mengandung karbohidrat yang tinggi. Untuk memaksimalkan perolehan bioethanol diperlukan proses pretreatment yang sesuai untuk memecah dinding sel SPR sehingga diperoleh glukosa yang siap difermentasi. Pada penelitian ini dilakukan tiga metode pretreatment yaitu ultrasonikasi, autoclave dan enzimatis. Pretreatment dengan ultrasonikasi dilakukan dengan ultasonicator batch 40 kHz selama 30 menit dan menghasilkan glukosa sebesar 147,1154 mg/L. Sedangkan dengan autoclave pada suhu 121 oC selama 30 menit menghasilkan glukosa sebesar 21.15385 mg/L. Pretreatmen enzimatis dilakukan dengan menggunakan kombinasi enzim α-amylase dan amyloglucosidase (1:0; 0,75: 0,25; 0,5:0,5; 0,25:0,75 dan 0:1) pada suhu 40 oC selama 180 menit. Yield glukosa maksimum diperoleh pada pengguanaan enzim α-amylase: amyloglucosidase = 0,25:0,75 yaitu sebesar 33,15%. Prodi Teknik Kimia UPN "Veteran" Yogyakarta 2021-04-26 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article application/pdf https://jurnal.upnyk.ac.id/index.php/eksergi/article/view/4551 10.31315/e.v0i0.4551 Eksergi; Vol. 18 No. 1 (2021); 7-12 Eksergi; Vol 18 No 1 (2021); 7-12 2460-8203 1410-394X 10.31315/e.v0i0 ind https://jurnal.upnyk.ac.id/index.php/eksergi/article/view/4551/pdf Copyright (c) 2021 Eksergi

oai:jurnal.upnyk.ac.id:article/4554 2022-11-07T10:15:39Z eksergi:ART driver

Design of a Water Filter Model with Ceramic Powder for Filter Media Wisaksono, Bambang Wahyudi, Hari Aini, Syarifah Besi (Fe) Kadmium (Cd) Mangan (Mn) Kualitas Air. Groundwater in the UPN Veteran Yogyakarta integrated campus complex smells and has a reddish brown color, and if the water also causes sediment in the water reservoir, it is assumed that the groundwater contains quite high levels of Ferro (Fe) and Manganese (Mn). Efforts are needed to reduce levels of Ferro (Fe) and Manganese (Mn) in accordance with the required regulations. The main focus of this research is to make a prototype of a clean water filter instrument to reduce levels of Ferro (Fe) and Manganese (Mn) in well water which functions to filter well water into clean water that is fit for consumption in accordance with the standards of the Regulation of the Minister of Health of the Republic of Indonesia number 32 at 2017. Based on the results of the well water quality test, 4 water quality parameters have a value that exceeds the required quality standard threshold, namely the pH value, Ferro (Fe) content, Manganese (Mn) content, and Cadmium (Cd) content. The composition of the water filter media composition is designed based on the results of the preliminary test analysis of the quality of well water as an example of raw water. The water filter tube is made of 4 inch diameter PVC pipe with a length of 80 cm. The composition of the filter media consists of: activated carbon, 25 cm; ceramic powder, 25 cm; volcanic sand, 15 cm; and gravel, 10 cm Prodi Teknik Kimia UPN "Veteran" Yogyakarta 2021-05-10 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article application/pdf https://jurnal.upnyk.ac.id/index.php/eksergi/article/view/4554 10.31315/e.v0i0.4554 Eksergi; Vol. 18 No. 1 (2021); 32-36 Eksergi; Vol 18 No 1 (2021); 32-36 2460-8203 1410-394X 10.31315/e.v0i0 ind https://jurnal.upnyk.ac.id/index.php/eksergi/article/view/4554/pdf Copyright (c) 2021 Eksergi

oai:jurnal.upnyk.ac.id:article/4559 2022-11-07T10:15:39Z eksergi:ART driver

The effects of Ultrasonication Pretreatment to Enzymatic Hydrolysis of Spirulina platensis Residue Efek Pretreatment Ultrasonikasi Terhadap Hidrolisis Enzimatis Spirulina platensis Residue Lestari, Indriana Anggorowati, Heni Hadi, Faizah mikroalga Spirulina platensis residue ultrasonikasi hidrolisis enzimatik gula reduksi The development of renewable energy from microalgae sources is still being studied to overcome the world energy crisis, one of which is biodiesel from Spirulina platensis. However, the extraction process from Spirulina platensis to obtain oil leaving waste called Spirulina platensis residue (SPR). SPR still contains carbohydrates in the form of cellulose in cell walls and starch in plastids. Carbohydrates can be converted into bioethanol through the hydrolysis process. To optimize the enzymatic hydrolysis of carbohydrates, pretreatment is needed to break down the cell walls. One method of pretreatment is ultrasonication. This study aimed to determine the effect of ultrasonication pretreatment on enzymatic hydrolysis. Ultrasonication was carried out with time variations (15, 30, and 45 minutes) then continued hydrolysis at 40 oC for 8 hours using α-amylase and glucosidase (1: 1) enzymes. The results of hydrolysis in the form of reducing sugars were analyzed using the Nelson Somogyi method and obtained an optimal pretreatment time is 30 minutes with a reducing sugar concentration of 2.493,3 mg/L Pengembangan energi terbarukan dari sumber mikroalga masih terus dikaji untuk mengatasi krisis energi dunia, salah satunya adalah biodiesel dari Spirulina platensis. Namun, proses pengepresan minyak dari Spirulina platensis menyisakan limbah yang disebut Spirulina platensis residue (SPR). SPR masih mengandung banyak karbohidrat dalam bentuk selulosa di dinding sel dan pati di dalam plastid. Karbohidrat dapat dimanfaatkan menjadi bioetanol melalui proses hidrolisis. Untuk mengoptimalkan hirolisis enzimatis terhadap karbohidrat maka diperlukan pretreatment dengan tujuan memecah dinding sel. Salah satu metode pretreatment adalah ultrasonikasi. Penelitian ini bertujuan untuk mengetahui pengaruh pretreatment ultrasonikasi terhadap hidrolisis enzimatis. Ultrasonikasi dilakukan dengan variasi waktu (15, 30, dan 45 menit) kemudian dilanjutkan hidrolisis pada suhu 40 oC selama 8 jam menggunakan enzim α-amilase dan glukosidase (1:1). Hasil hidrolisis berupa gula reduksi dianalisis menggunakan metode Nelson Somogyi dan diperoleh waktu pretreatment optimal selama 30 menit dengan konsentrasi gula reduksi sebesar 2.493,3 mg/L. Prodi Teknik Kimia UPN "Veteran" Yogyakarta 2021-05-06 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article application/pdf https://jurnal.upnyk.ac.id/index.php/eksergi/article/view/4559 10.31315/e.v0i0.4559 Eksergi; Vol. 18 No. 1 (2021); 24-28 Eksergi; Vol 18 No 1 (2021); 24-28 2460-8203 1410-394X 10.31315/e.v0i0 ind https://jurnal.upnyk.ac.id/index.php/eksergi/article/view/4559/pdf Copyright (c) 2021 Eksergi

oai:jurnal.upnyk.ac.id:article/4563 2023-01-15T05:33:08Z eksergi:ART driver

Influence of solvents to Distillation Extraction in Separating of Methanol- Acetone Mixture using Separating Wall Raytama, Reynardi Risyad Santoso, Herry Hartanto, Yansen Methylene blue is one of dying waste that causes harmful effect both enviromental and public health risks. A method to overcome the problem is to adsorb it with the activated carbon. Apart from that, corn cob is potential biomass with can convert to activated carbon. The aim of this research is to syntethic and to modify corn cob activated carbon with iron oxide. It is expected to increase the afinity of methylene blue to the activated carbon surface. The modification is done by wet impregnation and the effectiveness of the impregnated corn cob activated carbon is studied by analyse the persen removal of methylene blue in every interval time. The result show that in the concentration range of Fe load impregnation between 1%-3% which has been used, the corn cob activated carbon with concentration of Fe load 2% has the most optimum ability in methylene blue adsorption with the adsorption capacity 44,9%. Moreover, the effect pH shows that in acidic condition the adsorption of methylen blue is better than in netral condition Prodi Teknik Kimia UPN "Veteran" Yogyakarta 2021-11-01 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article application/pdf https://jurnal.upnyk.ac.id/index.php/eksergi/article/view/4563 10.31315/e.v0i0.4563 Eksergi; Vol. 18 No. 2 (2021); 77-81 Eksergi; Vol 18 No 2 (2021); 77-81 2460-8203 1410-394X 10.31315/e.v18i2 eng https://jurnal.upnyk.ac.id/index.php/eksergi/article/view/4563/pdf Copyright (c) 2021 Eksergi

oai:jurnal.upnyk.ac.id:article/4564 2022-11-07T10:13:06Z eksergi:ART driver

Renewable Energy from Pyrolysis of Pine Wood with Zeolite Catalyst Achmad, Zubaidi Arsa, Abdullah Kunta Alfitamara, Bety Virgiandini, Alfia Renewable energy becomes a hot issue on the decrease of fossil energy reserves that can not be renewed. To answer the challenge of the availability of these energy a study was performed in a high-temperature cracking process from pine wood to obtain fuel oil or so-called pyrolysis. The purpose of this study was to determine the yield, physical properties, and the calorific value of the pyrolysis results. Pyrolysis process is done by varying the percentage of mordenite-type zeolite catalyst as much as  0% b/b, 2% b/b, and 4% b/b, with a mass of 100 grams of pine wood that passes sieving each sample to 50 mesh. Before use, the catalysts physically activated by heating at a temperature of 500°C and chemically activated using HCl to enhance the activity of the zeolite. Pyrolysis carried out at 400°C, 450°C, 500°C, and 550°C. After the analysis, bio-oil obtained optimum yield of 43.77142% by mass of the catalyst 4% b/b and a temperature of 500 °C. Physical properties obtained in the form of density 1.094723 g/ml, 2.96 cP viscosity, and 58°C flash point. While the highest calorific value on the condition of the catalyst 4% and the reaction temperature 550°C is 26045.50 kJ/kg. Prodi Teknik Kimia UPN "Veteran" Yogyakarta 2022-04-05 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article application/pdf https://jurnal.upnyk.ac.id/index.php/eksergi/article/view/4564 10.31315/e.v19i1.4564 Eksergi; Vol. 19 No. 1 (2022); 1-5 Eksergi; Vol 19 No 1 (2022); 1-5 2460-8203 1410-394X 10.31315/e.v19i1 eng https://jurnal.upnyk.ac.id/index.php/eksergi/article/view/4564/pdf Copyright (c) 2022 Eksergi

oai:jurnal.upnyk.ac.id:article/4565 2023-01-15T05:33:08Z eksergi:ART driver

Effect of Addition of Turmeric Simplicia Antioxidant to Peanut Oil Peroxide Value Pengaruh Penambahan Antioksidan Simplisia Kunyit Terhadap Angka Peroksida Minyak Kacang Tanah Rahmawati, Yuniarti Dewi Peanut oil anoxidant peroxide value Peanut oil is a peanut product that is used for the food industry. The high content of fatty acids in the form of oleic acid causes peanut oil to break down easily, so it is necessary to add antioxidants to inhibit the oxidation process.The natural antioxidant used is turmeric. The purpose of this study was to determine the effect of the addition of turmeric antioxidants on the peroxide rate of peanut oil. The research method for calculating the peroxide number uses iodometric titration. The results showed that the greater the concentration of turmeric simplicia added to peanut oil, the greater the antioxidant activity. The greatest antioxidant activity was obtained from the weight of simplicia 0.4 g with a long immersion period of 7 days, which resulted in a peanut oil peroxide value of 14.5 ml N / gr. Minyak kacang tanah merupakan produk olahan kacang tanah yang dipakai untuk keperluan industri pangan. Kandungan asam lemak berupa asam oleatnya yang tinggi menyebabkan minyak kacang tanah mudah rusak sehingga perlu ditambahkan antioksidan untuk menghambat proses oksidasi. Antioksidan alami yang digunakan adalah kunyit. Tujuan dari penelitian ini adalah mengetahui pengaruh penambahan antioksidan kunyit terhadap angka peroksida minyak kacang tanah. Metode penelitian perhitungan angka peroksida menggunakan titrasi iodometri. Hasil penelitian menunjukkan bahwa semakin besar konsentrasi simplisia kunyit yang ditambahkan pada minyak kacang tanah, maka aktivitas antioksidan semakin besar. Aktivitas antioksidan terbesar didapat dari berat simplia 0,4 gr dengan lama perendaman 7 hari menghasilkan angka peroksida minyak kacang tanah 14,5 ml N/gr. Prodi Teknik Kimia UPN "Veteran" Yogyakarta 2021-11-01 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article application/pdf https://jurnal.upnyk.ac.id/index.php/eksergi/article/view/4565 10.31315/e.v0i0.4565 Eksergi; Vol. 18 No. 2 (2021); 56-59 Eksergi; Vol 18 No 2 (2021); 56-59 2460-8203 1410-394X 10.31315/e.v18i2 eng https://jurnal.upnyk.ac.id/index.php/eksergi/article/view/4565/pdf Copyright (c) 2021 Eksergi

oai:jurnal.upnyk.ac.id:article/4566 2024-08-20T10:50:53Z eksergi:ART driver

The Involving Laccifer Lacca Kerr as Resin to Fabricate Coconut Husk Biocomposite Penggunaan Sekresi Kutu Lak pada Pembuatan Biokomposit dari Sabut Kelapa Hermawan, Axel Adam Ariesta, Axl Ilcham, Adi Murni, Sri Wahyu biokomposit sekreski kutu lak sabut kelapa SNI Nowadays, biocomposite materials are required for particular needs. Coconut husk has a potential to be biocomposite using a resin produced by the laccifer lacca kerr (kerria lacca), an insect. This work was aimed to study the use of the lacca kerr resin to produce a biocomposite of coconut coir based. In the experimental, firstly, the cleaned coconut husks were chopped then mixed with lacca kerr resin and alcohol to make a composite dough. Then the dough were pressed with 130 psig at a 100oC within15 minutes. After that, the biocomposite was allowed to ambient temperature, then it properties were observed. To find the best product properties, the ratio of basic materials were varied. The ratio of coconut husk: lacca kerr resin was used ranged from 0.6 g/mL to 1.4 g/mL. The characterization of product properties were carried out based on ASTM D-638 and under guidance of the Indonesian National Standard (SNI) 03-2105-2006. Based on results, it was found that the best biocomposite observed had properties such as density of 0.45 g/cm3 , water content of 8.8% (maximum SNI requirement of 14%), degree of swelling of 67.6%, tensile strength of 43.4 kgf / cm2 (minimum SNI requirement of 3, 1 kgf / cm2 ), Young's modulus of 1219.2 kgf/cm2 , elongation of 67.7%, conductivity of 1.8 10-8 /.m. Some of these characteristics have met the Indonesian national standard (SNI). Sekresi kutu lak (SKL) merupakan resin yang dihasilkan oleh kutu lak yang hidup di pepohonan. Resin ini dapat dimanfaatkan sebagai bahan perekat pada pembuatan biokomposit bersama sabut kelapa. Penelitian ini bertujuan mempelajari penggunaan SKL pada pembuatan komposit berbahan dasar sabut kelapa. Pada penelitian ini mula-mula sabut kelapa yang telah dibersihkan dan dirajang dicampur bersama SKL dan alkohol untuk membuat adonan komposit. Selanjutnya adonan  dipres pada suhu dan tekanan tertentu. Setelah komposit dibiarkan mendingin secara alami, biokomposit yang dihasilkan diuji sifat-sifatnya. Untuk mempelajari sifat-sifatnya, biokomposit dibuat dengan berbagai perbandingan baku yaitu antara massa sabut kelapa dan volume SKL yang digunakan. Setelah dilakukan karakterisasi terhadap sampel biokomposit yang dibuat diketahui bahwa produk yang dihasilkan memiliki beragam sifat. Oleh karena itu diambil sifat rata-ratanya.  Sifat komposit yang dihasilkan adalah: kerapatan sebesar 0,45 g/cm3, kandungan air 8,8%, derajad penggembungan 67,6%, kuat tarik 43,4 kgf/cm2, modulus Young 1219,2 kgf/cm2, elongasi 67,7%, konduktivitas  1,8 10-8/W. Sebagian sifat ini sudah memenuhi standar nasional Indonesia (SNI). Prodi Teknik Kimia UPN "Veteran" Yogyakarta 2021-11-01 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article application/pdf https://jurnal.upnyk.ac.id/index.php/eksergi/article/view/4566 10.31315/e.v0i0.4566 Eksergi; Vol. 18 No. 2 (2021); 71-76 Eksergi; Vol 18 No 2 (2021); 71-76 2460-8203 1410-394X 10.31315/e.v18i2 ind https://jurnal.upnyk.ac.id/index.php/eksergi/article/view/4566/pdf Copyright (c) 2021 Eksergi

oai:jurnal.upnyk.ac.id:article/4572 2022-11-07T10:15:39Z eksergi:ART driver

Production of briquettes from Indonesia agricultural biomass waste by using pyrolysis process and comparing the characteristics Murni, Sri Wahyu Setyoningrum, Tutik Muji Nur, Muhamad Maulana Azimatun agriculture binder biomass waste briquette charcoal pyrolysis. Indonesia biomass waste is a potential feedstock as a source of renewable energy since it can be converted into carcoal briquettes. However, the production of the briquettes using pyrolysis process using the agricultural waste was lacking. In this research, briquette was made from palm shells,  corncob and soybean stem wood due to its high availability and have high cellulose content. The purpose of this research was to produce briquettes from three kind of raw materials by employing pyrolysis process and compared the characteristics. The briquette was made from different type of raw materials (palm shells, corncob and soybean stem) and  the concentration of binder : 3-7 %. Pyrolysis was done at  500 °C, and 100 kg / cm2 of pressing pressure. Results showed that, the best charcoal briquette was achieved from palm shells by using 5% binder, which resulted 4,1% moisture content, 3.4% ash content,  15% volatile matter content, 77.5% carbon content,  7075 cal/g calorific value and  1.4 kg/cm2 compresive strength. It is found that the concentration of binder and raw material influenced the quality of the briquettes. In overall, the production of the briquettes by employing pyrolysis method could meet the standard. Prodi Teknik Kimia UPN "Veteran" Yogyakarta 2021-04-27 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article application/pdf https://jurnal.upnyk.ac.id/index.php/eksergi/article/view/4572 10.31315/e.v0i0.4572 Eksergi; Vol. 18 No. 1 (2021); 13-17 Eksergi; Vol 18 No 1 (2021); 13-17 2460-8203 1410-394X 10.31315/e.v0i0 eng https://jurnal.upnyk.ac.id/index.php/eksergi/article/view/4572/pdf Copyright (c) 2021 Eksergi

oai:jurnal.upnyk.ac.id:article/4576 2022-11-07T10:15:39Z eksergi:ART driver

Effect of particle sizes and sodium hydroxide concentrations on silica extraction from minerals obtained in Kalirejo village, Kokap, Kulonprogo, Yogyakarta Setyoningrum, Tutik Muji Nandari, Wibiana Wulan Murni, Sri Wahyu Nur, Muhamad Maulana Azimatun Silica is mainly used in the production of rubber, glass, cement, glass, ceramics, paper, cosmetics, electronics, paintings, healthcare and other industries. Kalirejo village has a potential abundant resource of silica minerals. However, to refine it, high cost of extraction should be done to obtain high purity of silica. Different refining methods influence different purity of the silica. The purpose of this research was to study the refining process of mineral rock silica from Kalirejo village, Kokap, Kulonprogo by emplying simple and cheap solid-liquid extraction. Extraction was done by varying the particle size at 100 - 200 mesh, while NaOH concentration was varied in 0.5 N to 5 N.  Results showed that minerals taken from Kalirejo village was dominated by silica (23%).  The largest extract (4.89 gram) was obtained at 200 mesh and using NaOH 5 N with yield of 15.07%. Higher NaOH and higher particle size enhanced the extraction yield. This finding could help small communities in Kalirejo village to enhance the quality of silica by employing simple and cheap extraction process. Prodi Teknik Kimia UPN "Veteran" Yogyakarta 2021-05-07 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article application/pdf https://jurnal.upnyk.ac.id/index.php/eksergi/article/view/4576 10.31315/e.v0i0.4576 Eksergi; Vol. 18 No. 1 (2021); 29-31 Eksergi; Vol 18 No 1 (2021); 29-31 2460-8203 1410-394X 10.31315/e.v0i0 eng https://jurnal.upnyk.ac.id/index.php/eksergi/article/view/4576/pdf Copyright (c) 2021 Eksergi

oai:jurnal.upnyk.ac.id:article/4725 2023-01-15T05:33:08Z eksergi:ART driver

Modification of Natural Zeolite to ZSM-5 as CO2 Adsorber Modifikasi Zeolit Alam Menjadi ZSM-5 Sebagai Penjerap CO2 Budianto, Gregorius Prima Indra Biogas adsorpsi CO2 zeolit alam ZSM-5. Biogas is a product of the bio-decomposition process in anaerobic conditions. Methane (CH4) and carbon dioxide (CO2) are the compounds of biogas that act in determining the quality of biogas. When the CH4 level is high, the biogas will have a high caloric value; conversely, the increased CO2 levels result in low biogas heating value. One effort to purify biogas is the adsorption process using natural zeolite. Natural zeolite should be modified into ZSM-5 because it has a greater pore diameter than natural zeolite. It is expected that the increase of the efficiency of CO2 adsorption is more significant than natural zeolite. ZSM-5, which is altered from natural zeolite, will be compared to the effectiveness of CO2 adsorption compared to natural zeolite iogas merupakan produk dari proses penguraian bahan-bahan organik oleh mikroorganism dalam kondisi tanpa udara (anaerob).  Dari semua unsur biogas yang berperan dalam menentukan kualitas biogas yaitu gas metana (CH4) dan gas karbon dioksida (CO2). Bila kadar CH4 tinggi maka biogas tersebut akan memiliki nilai kalori yang tinggi. Sebaliknya jika kadar CO2 yang tinggi maka akan mengakibatkan nilai kalor biogas tersebut rendah. Salah satu usaha yang dapat dilakukan untuk memurnikan biogas adalah dengan proses adsorpsi semisal dengan zeolit. Dalam rangka meningkatkan efisiensi penjerapan CO2, modifikasi zeolit diperlukan. Pada penelitian ini digunakan zeolite hasil modifikasi yang dikenal dengan ZSM-5. Zeolite ZSM-5 hasil sintesis memiliki diameter pori yang lebih besar dari pada zeolit alam sehingga diharapkan peningkatan efisiensi penjerapan gas CO2 lebih besar dibandingkan dengan zeolite alam. Zeolit ZSM-5 yang telah diubah dari zeolit alam akan dibandingkan tingkat efektivitas penjerapan gas dibanding zeolit alam dan sintesis zeolit ZSM-5. Prodi Teknik Kimia UPN "Veteran" Yogyakarta 2021-11-01 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article application/pdf https://jurnal.upnyk.ac.id/index.php/eksergi/article/view/4725 10.31315/e.v18i2.4725 Eksergi; Vol. 18 No. 2 (2021); 60-64 Eksergi; Vol 18 No 2 (2021); 60-64 2460-8203 1410-394X 10.31315/e.v18i2 ind https://jurnal.upnyk.ac.id/index.php/eksergi/article/view/4725/pdf Copyright (c) 2021 Eksergi

oai:jurnal.upnyk.ac.id:article/5290 2023-01-15T05:33:08Z eksergi:ART driver

The Effect of Sand Mining on River Erosion and Sedimentation (Case Study in Tanjung Alam Village, Sei Dadap District, Asahan Regency) PENGARUH PERTAMBANGAN PASIR TERHADAP EROSI DAN SEDIMENTASI SUNGAI (STUDI KASUS DI DESA TANJUNG ALAM KECAMATAN SEI DADAP KABUPATEN ASAHAN) Muchlish, Muslich Faisyal, I.A. Sunarsih, Sri sand mining sedimentation erosion rate value Sand mining in Tanjung Alam Village, Sei Dadap District, Asahan Regency, which is carried out with a suction machine is thought to have a negative impact on the environment. This study aims to examine the effect of sand mining on erosion and sedimentation in that river. The analysis steps begins with measuring the river profile, measuring flow velocity, measuring river discharge, measuring sediment concentration, measuring rainfall, measuring slope and calculating the estimated rate of erosion. To calculate the estimated erosion rate in this study using the USLE method and to calculate the sediment load using SNI 3414: 2008 with the depth-integrating technique. Based on the calculation results, it is known that sand mining activity causes narrowing of the river profile, accelerates river flow, increases river discharge so that it increases the rate of erosion, and sedimentation. The highest sediment load value is at point 5 which is located downstream of mining 1 and 2 with a value of 2922.48 tons/day. While the highest estimated erosion rate is at point 5 with a value of 125.9 tons/ha/year which is included in the heavy category. Measurements at each sampling point prove that sand mining activities have a high impact on increasing the rate of erosion and sedimentation in rivers. Sand mining in Tanjung Alam Village, Sei Dadap District, Asahan Regency, which is carried out with a suction machine is thought to have a negative impact on the environment. This study aims to examine the effect of sand mining on erosion and sedimentation in that riverThe analysis steps begins with measuring the river profile, measuring flow velocity, measuring river discharge, measuring sediment concentration, measuring rainfall, measuring slope and calculating the estimated rate of erosion. To calculate the estimated erosion rate in this study using the USLE method and to calculate the sediment load using SNI 3414: 2008 with the depth-integrating techniqueBased on the calculation results, it is known that sand mining activity causes narrowing of the river profile, accelerates river flow, increases river discharge so that it increases the rate of erosion, and sedimentation. The highest sediment load value is at point 5 which is located downstream of mining 1 and 2 with a value of 2922.48 tons/day. While the highest estimated erosion rate is at point 5 with a value of 125.9 tons/ha/year which is included in the heavy category. Measurements at each sampling point prove that sand mining activities have a high impact on increasing the rate of erosion and sedimentation in rivers Prodi Teknik Kimia UPN "Veteran" Yogyakarta 2021-11-01 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article application/pdf https://jurnal.upnyk.ac.id/index.php/eksergi/article/view/5290 10.31315/e.v18i2.5290 Eksergi; Vol. 18 No. 2 (2021); 65-70 Eksergi; Vol 18 No 2 (2021); 65-70 2460-8203 1410-394X 10.31315/e.v18i2 ind https://jurnal.upnyk.ac.id/index.php/eksergi/article/view/5290/pdf Copyright (c) 2021 Eksergi

oai:jurnal.upnyk.ac.id:article/5304 2022-11-07T10:13:06Z eksergi:ART driver

Magnetite Surface Modification with Silica and Its Application as Adsorbent of Heavy Metal Ion Nickel and Manganese Mahmuda, Diah magnetit modifikasi permukaan silika adsorben This study aims to synthesize magnetite by a co-precipitation method. The prepared adsorbent magnetite coated by silica for the efficient removal nickel and manganese ions from the aqueous solutions. The prepared samples have characterized by several techniques like FTIR spectroscopy, XRD, and TEM. Surface modification causes the magnetite ability of removing metals ions increasing more than 98%. Preliminary results indicate that magnetite coated silica may be used as an adsorbent for removal of nickel and manganese ions from wastewater. Prodi Teknik Kimia UPN "Veteran" Yogyakarta 2022-04-05 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article application/pdf https://jurnal.upnyk.ac.id/index.php/eksergi/article/view/5304 10.31315/e.v0i0.5304 Eksergi; Vol. 19 No. 1 (2022); 6-9 Eksergi; Vol 19 No 1 (2022); 6-9 2460-8203 1410-394X 10.31315/e.v19i1 ind https://jurnal.upnyk.ac.id/index.php/eksergi/article/view/5304/pdf Copyright (c) 2022 Eksergi

oai:jurnal.upnyk.ac.id:article/5341 2023-01-15T05:33:08Z eksergi:ART driver

Fabrication and Characterization of Biodegradable Plastic Based on Mixture of Starch and Cellulose from Corn Waste Pembuatan dan Karakterisasi Biodegradable plastic Berbasis Campuran Pati dan Selulosa Dari Limbah Jagung Susanti, Ari Kusuma, Heri Septya Zafira, D.K. Ilmi, A.B. Agustina, I.E. Baqih, L Prayoga, Arie biodegradable plastic essential oil filler FTIR plasticizer Foodstuffs need proper packaging to prevent spoilage. The use of conventional plastics for packaging has caused environmental problems. It is necessary to develop environmentally friendly packaging as biodegradable plastic. The purpose of this study was to isolate cellulose from corn cobs with three different procedures to determine the best procedure for producing cellulose, as evidenced by the color and results of FTIR analysis. The best cellulose yields are used to make biodegradable plastic films combined with starch and a glycerol plasticizer, sodium montmorillonite nanoclay filler, and clove leaf essential oil. The film that has been made is continued with characterization in the form of analysis of degradation ability, analysis of volatility mass fraction (%), analysis of swelling degree (%), and water solubility (%). The results of this study found that the best cellulose isolation was produced by a procedure 2. The results of the analysis of the degradation ability of the film showed that it was under SNI 7188.7: 2016 with the fastest degradation results within four days with the addition of SMMT. The results of the VMF (%) analysis showed that the presence of EO and SMMT in the composition causes the VMF (%) value to be below. The results of the SD (%) analysis show that the presence of SMMT causes the SD (%) value to increase while the addition of EO causes the SD (%) value to decrease. The results of the WS (%) analysis showed that the presence of SMMT causes the WS (%) to increase, while the addition of EO to the composition variation causes the WS (%) to decrease Bahan makanan membutuhkan kemasan yang tepat untuk mencegah kerusakan. Penggunaan plastik konvensional untuk kemasan telah menimbulkan masalah terhadap lingkungan. Diperlukan suatu pengembangan kemasan yang ramah lingkungan yakni biodegradable plastic. Tujuan penelitian ini adalah melakukan isolasi selulosa dari tongkol jagung dengan tiga prosedur yang berbeda untuk menentukan prosedur terbaik penghasil selulosa dibuktikan dari warna dan hasil analisa FTIR. Hasil selulosa terbaik digunakan untuk membuat film biodegradable plastic yang dikombinasikan dengan pati serta campuran plasticizer gliserol, filler sodium montmorillonite nanoclay dan essential oil daun cengkeh. Film yang sudah dibuat dilanjutkan dengan karakterisasi berupa analisa kemampuan degradasi, analisa %volatility mass fraction, analisa %swelling degree dan %water solubility. Dari hasil penelitian ini didapatkan bahwa isolasi selulosa terbaik dihasilkan dengan prosedur yang melakukan pengulangan pada bagian bleaching. Hasil analisa kemampuan degradasi film menunjukkan sesuai dengan SNI 7188.7: 2016 dengan hasil degradasi tercepat dalam waktu 4 hari dengan tambahan SMMT. Hasil analisa %VMF menunjukkan dengan adanya EO dan SMMT pada komposisi menyebabkan nilai %VMF rendah. Hasil analisa %SD menunjukkan, dengan adanya kandungan SMMT menyebabkan nilai %SD meningkat sedangkan adanya penambahan EO menyebabkan nilai %SD makin rendah. Hasil analisa %WS menunjukkan, adanya SMMT menyebabkan %WS meningkat sedangkan dengan adanya tambahan EO pada variasi komposisi menyebabkan %WS menurun. Prodi Teknik Kimia UPN "Veteran" Yogyakarta 2021-11-01 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article application/pdf https://jurnal.upnyk.ac.id/index.php/eksergi/article/view/5341 10.31315/e.v18i2.5341 Eksergi; Vol. 18 No. 2 (2021); 49-55 Eksergi; Vol 18 No 2 (2021); 49-55 2460-8203 1410-394X 10.31315/e.v18i2 ind https://jurnal.upnyk.ac.id/index.php/eksergi/article/view/5341/pdf Copyright (c) 2021 Eksergi

oai:jurnal.upnyk.ac.id:article/5361 2022-11-07T10:12:47Z eksergi:ART driver

Characteristics and Applications of Sea Water Reverse Osmosis Reject Water of PT Cirebon Electric Power as Voltaic Cell Electrolyte and Salt Raw Material Characteristics and Applications of Sea Water Reverse Osmosis Reject Water of PT Cirebon Electric Power as Voltaic Cell Electrolyte and Salt Raw Material Pramudikto, Dimas Agung Nugroho, Satya Putra, Agik Dwika Putra, Ilham Satria Raditya Setyawan, Sigit Ariyanto, Teguh air reject SWRO garam PT CEP sel Volta Sea Water Reverse Osmosis (SWRO) reject water produced by PT Cirebon Electric Power has not been optimally utilized. In this research, a study of the characteristics of SWRO reject water was carried out to determine important properties such as turbidity, conductivity, pH and salinity. This characteristic is important as a basis for consideration of SWRO reject water applications. In addition, data were taken from a fairly long period of 5 years of SWRO operation (2016-2021) so that the consistency of the data can be known. The results showed that SWRO reject water had low turbidity (0.18±0.08 NTU), high conductivity of ca. 76.000 µS/cm, neutral pH and high salinity (4.6±0.3%). The study of the utilization of SWRO reject water was then carried out, namely as an electrolyte for salt water lamps and as raw material for making salt. The results showed that SWRO reject water can be used as an electrolyte for salt water lamps which produces a voltage potential up to 1.4 Volts (20% higher than seawater electrolyte). As a raw material for salt, the salt produced has excellent characteristics (eg 99% NaCl) and complies with SNI 3556:2016, except for the KIO3 content. Sea Water Reverse Osmosis (SWRO) reject water produced by PT Cirebon Electric Power has not been optimally utilized. In this research, a study of the characteristics of SWRO reject water was carried out to determine important properties such as turbidity, conductivity, pH and salinity. This characteristic is important as a basis for consideration of SWRO reject water applications. In addition, data were taken from a fairly long period of 5 years of SWRO operation (2016-2021) so that the consistency of the data can be known. The results showed that SWRO reject water had low turbidity (0.18±0.08 NTU), high conductivity of ca. 76.000 µS/cm, neutral pH and high salinity (4.6±0.3%). The study of the utilization of SWRO reject water was then carried out, namely as an electrolyte for salt water lamps and as raw material for making salt. The results showed that SWRO reject water can be used as an electrolyte for salt water lamps which produces a voltage potential up to 1.4 Volts (20% higher than seawater electrolyte). As a raw material for salt, the salt produced has excellent characteristics (eg 99% NaCl) and complies with SNI 3556:2016, except for the KIO3 content. Prodi Teknik Kimia UPN "Veteran" Yogyakarta 2022-07-26 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article application/pdf https://jurnal.upnyk.ac.id/index.php/eksergi/article/view/5361 10.31315/e.v19i2.5361 Eksergi; Vol. 19 No. 2 (2022); 46-50 Eksergi; Vol 19 No 2 (2022); 46-50 2460-8203 1410-394X 10.31315/e.v19i2 ind https://jurnal.upnyk.ac.id/index.php/eksergi/article/view/5361/pdf Copyright (c) 2022 Eksergi

oai:jurnal.upnyk.ac.id:article/5362 2023-01-15T05:33:08Z eksergi:ART driver

Kinetic Study on Coagulation Process with Poly Aluminium Chloride and Alum Coagulants in Treating The Liquid Waste of Tempeh Industry Syaichurrozi, Iqbal COD Koagulasi Model Kinetik Poly Aluminium Chloride Tawas Several factors that influence the coagulation process in reducing chemical oxygen demand (COD) in wastewater are processing time, coagulant dose and type of coagulant. The effect of these three factors on the reduction of COD in tempeh industrial wastewater during the coagulation process has been investigated by Hidayah (2018). However, kinetic studies in depth have not been done by Hidayah (2018). Therefore, the aim of this study was to develop a new kinetic model that can predict the performance of the coagulation process. It is hoped that the kinetic model can be used in a wider range of operating conditions. In this study, the pseudo first order and pseudo second order kinetic models were tested to get the best model. Based on simulation results, both models produced almost the same accuracy. For reason of simplification, the pseudo first order model was chosen as the basic model in this study. Furthermore, modifications were made to the pseudo first order model so that the effect of processing time, coagulant dose and type of coagulant appeared in the model. This kinetic model was successfully tested to predict the coagulation performance of study of Hidayah (2018) with an average Mean Absolute Percentage Error (MAPE) of 10.8%. Prodi Teknik Kimia UPN "Veteran" Yogyakarta 2021-11-01 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article application/pdf https://jurnal.upnyk.ac.id/index.php/eksergi/article/view/5362 10.31315/e.v0i0.5362 Eksergi; Vol. 18 No. 2 (2021); 43-48 Eksergi; Vol 18 No 2 (2021); 43-48 2460-8203 1410-394X 10.31315/e.v18i2 eng https://jurnal.upnyk.ac.id/index.php/eksergi/article/view/5362/pdf Copyright (c) 2021 Eksergi

oai:jurnal.upnyk.ac.id:article/5400 2023-01-15T05:33:08Z eksergi:ART driver

The effect of solvent and temperature on yield and pectin characteristics from kepok banana peels PENGARUH JENIS ASAM DAN SUHU EKSTRAKSI TERHADAP KARAKTERISTIK PEKTIN DARI KULIT PISANG KEPOK ristianingsih, yuli Lestari, Indriana Nandari, Wibiana Wulan kulit pisang kepok pektin HCl asam asetat Pectin is structurally and functionally the most complex polysaccharide in plant cell walls. Pectin is widely used as an adhesive and emulsifier in the food, pharmaceutical industry and also as an adsorbent in waste water treatment. This research used banana peels as a raw material. The purpose of this study was to study the effect of temperature and solvent (acetic acid and hydrochloric acid) on the characteristics of pectin (ash content, methoxyl and galacturonic content). This research was carried out in a stirred tank reactor for 90 minutes with various types of solvents (hydrochloric acid and acetic acid) and extraction temperatures (60, 70, 80 and 90) 0C. Based on the research, it was found that the optimum pectin yield with 0.25 N HCl at a temperature of 800C was 24.93%. The characteristics of pectin which include galacturonic acid, methoxyl content, ash content and equivalent weight at an extraction temperature of 800C with a concentration of 0.25 N HCl were 79,56%; 2.65; 6,72% and 3846 Pektin merupakan senyawa polisakarida yang melapisi dinding sel tanaman. Pektin banyak dimanfaatkan sebagai zat perekat dan pengental pada industri makanan, farmasi dan juga sebagai adsorben pada pengolahan limbah. Penelitian ini menggunakan kulit pisang kepok sebagai bahan baku. Tujuan penelitian ini adalah mempelajari pengaruh suhu dan jenis pelarut (asam asetat dan HCl) terhadap karakteristik pektin (kadar abu. Kadar metoksil dan galakturonat). Penelitian dilakukan dalam sebuah reaktor berpengaduk selama 90 menit dengan variasi jenis pelarut (HCl dan asam asetat) dan suhu ekstraksi (60, 70, 80 dan 90) 0C. berdasarkan penelitian diperoleh rendemen maksimal dihasilkan pada pektin dengan pelarut HCl 0,25 N pada suhu 800C sebesar 24,93%. Karakteristik pektin yang meliputi kadar galakturonat, kadar metoksil, kadar abu dan berat ekivalen pada suhu ekstraksi 800C dengan konsentrasi HCl 0,25 N masing-masing adalah 79,56%; 2,65; 6,72% dan 3846. Prodi Teknik Kimia UPN "Veteran" Yogyakarta 2021-11-01 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article application/pdf https://jurnal.upnyk.ac.id/index.php/eksergi/article/view/5400 10.31315/e.v18i2.5400 Eksergi; Vol. 18 No. 2 (2021); 37-42 Eksergi; Vol 18 No 2 (2021); 37-42 2460-8203 1410-394X 10.31315/e.v18i2 ind https://jurnal.upnyk.ac.id/index.php/eksergi/article/view/5400/pdf Copyright (c) 2021 Eksergi

oai:jurnal.upnyk.ac.id:article/5660 2023-01-15T05:33:08Z eksergi:ART driver

Potency of Spirulina platensis as a source of cosmetic and bioplastic (review) Potensi Spirulina platensis sebagai sumber kosmetik dan bioplastik (review) Azimatun Nur, Muhamad Maulana Setyoningrum, Tutik Muji Aziz Suwardi, Halim Nur Alfitamara, Bety Kurniawan, Adi Prananda, Vinka Azzah Afni, Dwi Nur Alodia, Sheila Pamularsih, Retno Spirulina plantesis is a cyanobacteria that has many purposes such as for cosmetics, and food industry. In addition, Spirulina platensis can accumulate polyhydroxybutyrate (PHB), a type of bioplastic. This review discussed the potency of Spirulina platensis as a source of bioplastics and cosmetics. From the review, Spirulina contained bioactive compound, C-phycocyanin, which can inhibit cell damage and is very potential to be applied for cosmetics. The PHB content in Spirulina tends to be small compared to other microalgae. To reduce the cost of PHB from Spirulina, the biorefinery concept can be applied, by recovery the bioactive components (C-phycocyanin), while the residue can be used as a source of PHB. Spirulina plantesis merupakan salah satu Jenis mikroalga yang mempunyai banyak kegunaan, beberapa di antaranya yaitu untuk pembuatan kosmetik. Di samping itu, Spirulina platensis merupakan cyanobacteria yang dapat mengakumulasi bioplastik jenis polihidroksibutirat (PHB). Review paper ini membahas tentang potensi produksi Spirulina platensis sebagai sumber bioplastik dan kosmetik. Dari pemaparan, Spirulina memiliki senyawa yang memiliki kandungan bioaktif C-phycocyanin yang dapat menghambat kerusakan sel dan sangat potensial diaplikasikan untuk kosmetik. Kandungan PHB yang ada di Spirulina cenderung kecil. Untuk menurunkan biaya produksi PHB, dapat dilakukan konsep biorefinery, dengan mengambil komponen bioaktif, sementara residunya dapat digunakan sebagai sumber PHB. Prodi Teknik Kimia UPN "Veteran" Yogyakarta 2021-11-01 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article application/pdf https://jurnal.upnyk.ac.id/index.php/eksergi/article/view/5660 10.31315/e.v18i2.5660 Eksergi; Vol. 18 No. 2 (2021); 82-88 Eksergi; Vol 18 No 2 (2021); 82-88 2460-8203 1410-394X 10.31315/e.v18i2 ind https://jurnal.upnyk.ac.id/index.php/eksergi/article/view/5660/pdf Copyright (c) 2021 Eksergi

oai:jurnal.upnyk.ac.id:article/6036 2022-11-07T10:12:47Z eksergi:ART driver

Modification of Natural Carbolic Acid from Arpus wit Lemongrass Essential oil as a Disinfectant nandari, wibiana wulan Hadi, Faizah Puspitasari, Mitha Nugraheni, Susanti Rina Mahargiani, Titik karbol arpus serai desinfektan Carbolic acid is a cleaning fluid or disinfectant that can be used to clean various kinds of surfaces, especially floors. Carbolic acid is used to prevent germs and viruses from growing so as to prevent disease and its spread. Most housewives often use chemical-based floor cleaners that are immediate or more practical. Long-term and too frequent use can be harmful to the body and the environment. Therefore, one solution to minimize this is to use natural ingredients that are already available and developed in Lubuklinggau City, such as lemongrass to be used as carbolic acid. The preparation begins by dissolving the arpus into the NaOH solution until it dissolves, then adding a mixture of pine oil, teepol and propylene glycol until everything is homogeneously mixed. Carbol is ready to use. The resulting product is carbolic floor disinfectant. Modified natural carbolic acid from arpus and lemongrass can be used as a disinfectant because based on the results of research that has been done it can kill E-coli bacteria and has a fairly high effectiveness with an inhibition zone of 19.2 mm. Prodi Teknik Kimia UPN "Veteran" Yogyakarta 2022-07-28 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article application/pdf https://jurnal.upnyk.ac.id/index.php/eksergi/article/view/6036 10.31315/e.v0i0.6036 Eksergi; Vol. 19 No. 2 (2022); 71-76 Eksergi; Vol 19 No 2 (2022); 71-76 2460-8203 1410-394X 10.31315/e.v19i2 ind https://jurnal.upnyk.ac.id/index.php/eksergi/article/view/6036/pdf_1 Copyright (c) 2022 Eksergi

oai:jurnal.upnyk.ac.id:article/6123 2022-11-18T06:48:30Z eksergi:ART driver

Physical Property Analysis of Biodegradable Film Made from Garut Starch, Glycerol, and Citric Acid Istiani, Alit Yusuf, Yusmardhany Irfandy, Fauzan Puspitasari, Mitha starch arrowroot glycerol citric acid biodegradable films bioplastic The biodegradable film is an attempt to reduce the use of plastics that cannot be decomposed by nature. This study described biodegradable films produced from arrowroot starch using the casting method. As a plasticizer and crosslinker, glycerol and citric acid are added. The investigation results indicate that the biodegradable film has a clear white color; the greater the amount of starch, the more opaque the color. The tensile strength test results also indicate that the biodegradable film’s tensile strength will be greater the more starch is used, but its percent elongation at break will decrease, or its characteristics will become less elastic. In contrast, adding citric acid demonstrates that the tensile strength decreases due to the hydrolysis of glycosidic linkages in starch. Prodi Teknik Kimia UPN "Veteran" Yogyakarta 2022-11-14 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article application/pdf https://jurnal.upnyk.ac.id/index.php/eksergi/article/view/6123 10.31315/e.v19i3.6123 Eksergi; Vol. 19 No. 3 (2022); 148-152 Eksergi; Vol 19 No 3 (2022); 148-152 2460-8203 1410-394X 10.31315/e.v19i3 ind https://jurnal.upnyk.ac.id/index.php/eksergi/article/view/6123/pdf Copyright (c) 2022 Eksergi

oai:jurnal.upnyk.ac.id:article/6132 2022-11-07T10:13:06Z eksergi:ART driver

Production of biodiesel from waste cooking oil using heterogeneous catalyst Jaya, Danang Wahyu Widayati, Tunjung Salsabiela, Hanum Abdul Majid, Muhammad Fathan minyak jelantah katalis CaO esterifikasi transesterfikasi biodiesel The world's oil reserves are running low, which makes the government also implement a mandatory B30 policy starting in early 2020. With this policy, it is necessary to develop energy by utilizing renewable energy such as vegetable oil that can be converted into biodiesel. Waste cooking oil is one of the vegetable oils that has the potential to be processed into biodiesel because the use of waste cooking oil in Indonesia is still not developed. In this study, we report the yield of biodiesel from waste cooking oil with variations in the ratio of the number of moles and weight of heterogeneous catalysts. Biodiesel is made by esterification and transesterification with a heterogeneous catalyst (CaO), then a separation process is carried out to separate the biodiesel produced from the by-product in the form of glycerol. The separated biodiesel is then analyzed for density, viscosity, flash point, and pour point. The results showed that the best biodiesel was at a mole ratio of 1:24 with 3% CaO catalyst. Based on the analysis data, this biodiesel has the largest yield of 72.49% with a viscosity value of 4.9806 cSt, a flash point value of 72.5 oC, a pour point value of 0 oC, and a density value of 0.8662 g/ml and calorific value. 8837,302 cal/gram. With the results of the analysis, that are in accordance with the quality standards of SNI 7182:2015. Prodi Teknik Kimia UPN "Veteran" Yogyakarta 2022-04-05 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article application/pdf https://jurnal.upnyk.ac.id/index.php/eksergi/article/view/6132 10.31315/e.v0i0.6132 Eksergi; Vol. 19 No. 1 (2022); 29-34 Eksergi; Vol 19 No 1 (2022); 29-34 2460-8203 1410-394X 10.31315/e.v19i1 eng https://jurnal.upnyk.ac.id/index.php/eksergi/article/view/6132/pdf Copyright (c) 2022 Eksergi

oai:jurnal.upnyk.ac.id:article/6163 2022-11-07T10:12:47Z eksergi:ART driver

Isotherm and Adsorption Thermodynamics Cross-Linked Chitosan Microcapsules of Kalium Pershulphate to Methyl Orange Dye Sulistyawati, Endang Anggorowati, Heni Rochmah K.P, Nadia Ariardini, Navyta Isoterm Langmuir Isoterm Freundlich kitosan termodifikasi termodinamika zat warna azo Modeling of isotherm and adsorption thermodynamics in this study, leads to the determination of the classification of adsorption isotherms and the determination of the amount of energy and entropy to determine the impeccability of the process. As an adsorbent, a potassium persulfate crosslinked chitosan microcapsule was synthesized through a microencaptulation process using a solvent evaporation method with a carboxy methyl cellulose CMC coating. The characteristics of the chitosan microcapsules that were formed had a degree of deacetylation of 53,92 %, and a bn mutant diameter around 1-100 µm. Test materials used azo methyl orange dyes, which are often found in industrial waste and laboratory waste. Observations were made with variations in the concentration of methyl orange solution 5, 7,5, 10, 12,5, 15, 17,5 and 20 ppm at temperatures of 30, 40 and 50 ° C. The calculation results show that the adsorption isotherm model obtained approaches the Langmuir isotherm model. The results of the analysis of temperature effects obtained positive Gibbs energy change values (ΔG) so that the adsorption process takes place non-spontaneously. The values of  enthalpy change (ΔH) and entropy change (ΔS) of 33,86 kJ / mol and 0,0899 kJ / mol.K.  This indicates that adsorption occurs chemically adsorption, is endothermic and adsorbat is not completely adsorbed. Prodi Teknik Kimia UPN "Veteran" Yogyakarta 2022-07-26 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article application/pdf https://jurnal.upnyk.ac.id/index.php/eksergi/article/view/6163 10.31315/e.v19i2.6163 Eksergi; Vol. 19 No. 2 (2022); 51-57 Eksergi; Vol 19 No 2 (2022); 51-57 2460-8203 1410-394X 10.31315/e.v19i2 ind https://jurnal.upnyk.ac.id/index.php/eksergi/article/view/6163/pdf Copyright (c) 2022 Endang Sulistyawati, Heni Anggorowati

oai:jurnal.upnyk.ac.id:article/6310 2022-11-07T10:13:06Z eksergi:ART driver

Mathematical Model of Water Absorption in Arrowroot Starch-Chitosan Based Bioplastic Yusuf, Yusmardhany Irfandy, Fauzan Istiani, Alit Expansion of the size of the weight of bioplastics often occurs in daily use. This phenomenon happens because the material from bioplastics can absorb significant amounts of water. This process can lead to accumulation of swelling degree. Therefore, a mathematical model is needed to quantify this mechanism to predict the dynamics of changes in the weight of bioplastics with respet to time while contact with water to help practitioners during application design for the use of bioplastics. This study aims to build a mathematical model derived from the mass sense validated by experimental data through curve fitting. The experiment was conducted by observing the rate of change in the mass of bioplastic made from starch and chitosan by measuring the change in mass concerning time immersed in water under atmospheric conditions. The immersion time was varied between 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 20, 30, 40,50, and 60 minutes. As a result, it can be concluded that starch-chitosan-based biofilms can absorb water up to ±10.9174 gr-water/gr-bioplastic, and also this phenomenon can be quantified by a mathematical equation that derived from mass balance with an average percent error of 1.13% and R-squared coefficient of 0.9981.  Prodi Teknik Kimia UPN "Veteran" Yogyakarta 2022-04-05 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article application/pdf https://jurnal.upnyk.ac.id/index.php/eksergi/article/view/6310 10.31315/e.v19i1.6310 Eksergi; Vol. 19 No. 1 (2022); 35-39 Eksergi; Vol 19 No 1 (2022); 35-39 2460-8203 1410-394X 10.31315/e.v19i1 eng https://jurnal.upnyk.ac.id/index.php/eksergi/article/view/6310/pdf Copyright (c) 2022 Yusmardhany Yusuf

oai:jurnal.upnyk.ac.id:article/6346 2022-11-07T10:12:47Z eksergi:ART driver

Acid Tar Waste Beneficiation Through Blending with Coal Musademba, Downmore Simbi, David Jambgwa Kuipa, Pardon Kusaziwa Acid tar waste blending binary mixture proximate analysis The possibility of blending acid tar waste with coal as a beneficiation method was explored in this work. It was essential to first establish the material properties of the acid tar and coal samples together with that of the blends in terms of proximate analyses. The acid tar waste to coal blending ratios of 3:1, 1:1 and 1:3 were used. It was observed that acid tar waste exhibited high volatile and moisture content with low ash and carbon content when compared with coal. When compared with coal; a 3:1 blending ratio exhibited 56.9 % and 7.6 % reduction in ash and fixed carbon respectively and on the contrary a 38.1 % increase in volatile matter was observed. An opposite trend was obtained with 1:3 blend ratio. The 1:1 blend ratio was found to decrease the volatile and ash content by 8.3 % and 52.7 % respectively whilst fixed carbon boosted by 4.2 %. The choice for the blending ratio to apply is a trade-off between fixed carbon and volatile matter. If volatile matter is of any significance then a 3:1 mixture would be ideal; such a mixture will aid in easier ignition of coal.  On the other hand a 1:3 binary mixture yields a higher fixed carbon fraction, whose effect is to boost the calorific value of the fuel, an excellent factor for combustion. Overall however, it makes economic sense to blend coal with acid tar waste for enhancing sustainability. Prodi Teknik Kimia UPN "Veteran" Yogyakarta 2022-07-31 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article application/pdf https://jurnal.upnyk.ac.id/index.php/eksergi/article/view/6346 10.31315/e.v19i2.6346 Eksergi; Vol. 19 No. 2 (2022); 77-81 Eksergi; Vol 19 No 2 (2022); 77-81 2460-8203 1410-394X 10.31315/e.v19i2 eng https://jurnal.upnyk.ac.id/index.php/eksergi/article/view/6346/pdf Copyright (c) 2022 Downmore Musademba

oai:jurnal.upnyk.ac.id:article/6387 2022-11-07T10:13:06Z eksergi:ART driver

Influence of dietyl ether on the mixture of biodiesel B50 Jaya, Danang Litaay, Rico Mitchell Bagus, Ryan Ade Widayati, T.W. Syahri, Muhammad B50 biodiesel solar crude palm oil diethyl ether. Biodiesel is generally defined as monoalkyl esters of plant oils and animal fats. Oils derived from plants and animal fats and their derivatives have the possibility as a substitute for diesel fuel. This biodiesel is then mixed with diesel with a composition of 50% biodiesel and 50% diesel to make B50. In this study, B50 was then mixed with diethyl ether. The results of this study, obtained a mixture of B50+0% diethyl ether, B50+2% diethyl ether, B50+4% diethyl ether, B50+6% diethyl ether, B50+8% diethyl ether, B50+10% diethyl ether with kinematic viscosity (6.5 mm2/s, 6 mm2/s, 5.4 mm2/s, 5 mm2/s, 4.3 mm2/s, and 3.6 mm2/s), flash point (183 oC, 179 oC, 177 oC, 175 oC, 171 oC, and 167 oC), pour point (7 oC, 6 oC, 5 oC, 4 oC, 2 oC, and 1 oC), caloric value (10051,66 cal/m3, 10097,1322 cal/gram, 10128,13 cal/gram, 10170,38 cal/gram, 10235,37 cal/gram, and 10306,84 cal/gram), and density 15 oC (841.1 Kg/m3, 839.5 Kg/m3, 838.2 Kg/m3, 837 Kg/m3, 836.2 Kg/m3, dan 835.1 Kg/m3) Prodi Teknik Kimia UPN "Veteran" Yogyakarta 2022-04-05 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article application/pdf https://jurnal.upnyk.ac.id/index.php/eksergi/article/view/6387 10.31315/e.v19i1.6387 Eksergi; Vol. 19 No. 1 (2022); 10-14 Eksergi; Vol 19 No 1 (2022); 10-14 2460-8203 1410-394X 10.31315/e.v19i1 ind https://jurnal.upnyk.ac.id/index.php/eksergi/article/view/6387/pdf Copyright (c) 2022 Ryan Ade Bagus, Rico Mitchell Litaay, Danang Jaya

oai:jurnal.upnyk.ac.id:article/6479 2022-11-07T10:13:06Z eksergi:ART driver

The Effect of Adding Activated Sludge and Types of Series Circuit Systems Microbial Fuel Cell (MFC) Using Chinese Food Restaurant Wastewater Jaya, Danang Widayati, Tunjung Wahyu Nugroho, Singgih Adi Ellysa, Firda MFC active sludge waste electricity environment renewable energy Electricity consumption expands every year. However, in Indonesia, electricity is still highly dependent on conventional energy sources such as coal. A microbial fuel cell (MFC) is one of the alternative inventions that consists of a series of tools which converts chemical energy into electrical energy in the presence of microbial metabolism. In addition to produce electrical energy, it may also help to solve environmental issues by dealing with waste. This research was purposed to investigate the potency of Chinese food restaurant waste as substrate to generate electricity in microbial fuel cell. The research was done in three stages: wastewater preparation, assembly of MFC tools in various circuits, and running MFC processes. Results showed that the best electrical average (1.02 V) was found in the treatment system without active sludge. The best circuit was in the system in 4 series, which obtained a maximum voltage of 3.76 V and the largest power density of 62.66  mW/m2. In addition, with the addition of active sludge, biological oxygen demand (BOD) of the wastewater could be lowered up to 29.27%, and chemical oxygen demand (COD) up to 51.58%. Total suspended solid (TSS) could be decreased up to 49% on the sample withoud sludge addition. Prodi Teknik Kimia UPN "Veteran" Yogyakarta 2022-04-08 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article application/pdf https://jurnal.upnyk.ac.id/index.php/eksergi/article/view/6479 10.31315/e.v19i1.6479 Eksergi; Vol. 19 No. 1 (2022); 40-45 Eksergi; Vol 19 No 1 (2022); 40-45 2460-8203 1410-394X 10.31315/e.v19i1 eng https://jurnal.upnyk.ac.id/index.php/eksergi/article/view/6479/pdf Copyright (c) 2022 Danang Jaya, Tunjung Wahyu Widayati, Singgih Adi Nugroho, Firda Ellysa, Muhamad Maulana Azimatun Nur

oai:jurnal.upnyk.ac.id:article/6581 2022-11-07T10:13:06Z eksergi:ART driver

Effect of NaNO3 Concentration in Medium of Raoof on Cultivation of Spirulina Platensis Pengaruh Variasi Konsentrasi NaNO3 pada Medium Raoof terhadap Kultivasi Spirulina Platensis Syaichurrozi, Iqbal Wardalia, Wardalia Dwicahyanto, Sharfan Toron, Yustinus Selis kultivasi medium Raoof NaNO3 Spirulina platensis Nutrition is one of the factors that affect the growth of Spirulina platensis. The cultivation medium proposed by Raoof is a modified version of Zarrouk medium. Raoof medium requires less nutrients than Zarrouk medium but the biomass produced is almost the same. This study was conducted to vary the concentration of NaNO3 of 0.5; 1.5; 2.5; 3.5 g/L in Raoof medium to study its effect on growth and biomass composition of S. platensis. At each concentration of NaNO3 of 0.5; 1.5; 2.5; 3.5 g/L obtained the highest biomass concentration of 0.6425; 0.6455; 0.6745; 0,5193 g/L on days 12, 12, 12, 10. Concentration of NaNO3 of 2.5 g/L resulted in the highest specific growth rate of 0.1371/day and the lowest double time of 5.0566 days. In general, increasing the concentration of NaNO3 from 0.5 to 2.5 g/L increased the protein content from 33.30 to 36.98%. The addition of higher NaNO3 (3.5 g/L) actually decreased the protein content to 35.52%. Nutrisi adalah salah satu faktor yang mempengaruhi pertumbuhan Spirulina platensis. Medium kultivasi yang diusulkan oleh Raoof adalah hasil modifikasi dari mudium Zarrouk. Medium Raoof membutuhkan nutrisi yang lebih sedikit dibandingkan medium Zarrouk tetapi biomassa yang dihasilkan hampir sama. Penelitian ini dilakukan untuk memvariasikan konsentrasi NaNO3 0,5; 1,5; 2,5; 3,5 g/L pada medium Raoof untuk mempelajari pengaruhnya terhadap pertumbuhan dan komposisi biomassa S. platensis. Pada masing-masing konsentrasi NaNO3 0,5; 1,5; 2,5; 3,5 g/L diperoleh konsentrasi biomassa tertinggi sebesar 0,6425; 0,6455; 0,6745; 0,5193 g/L pada hari ke-12, 12, 12, 10. Konsentrasi NaNO3 2,5 g/L menghasilkan specific growth rate tertinggi yaitu 0,1371 /hari dan double time terendah yaitu 5,0566 hari. Secara umum, peningkatan konsentrasi NaNO3 dari 0,5 ke 2,5 g/L meningkatkan kadar protein dari 33,30 menjadi 36,98 %. Penambahan NaNO3 lebih tinggi (yaitu 3,5 g/L) justru menurunkan kadar protein menjadi 35,52%. Prodi Teknik Kimia UPN "Veteran" Yogyakarta 2022-04-05 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article application/pdf https://jurnal.upnyk.ac.id/index.php/eksergi/article/view/6581 10.31315/e.v19i1.6581 Eksergi; Vol. 19 No. 1 (2022); 15-19 Eksergi; Vol 19 No 1 (2022); 15-19 2460-8203 1410-394X 10.31315/e.v19i1 ind https://jurnal.upnyk.ac.id/index.php/eksergi/article/view/6581/pdf Copyright (c) 2022 Iqbal Syaichurrozi, Wardalia Wardalia, Sharfan Dwicahyanto, Yustinus Selis Toron

oai:jurnal.upnyk.ac.id:article/6653 2022-11-07T10:13:06Z eksergi:ART driver

Separation of Mineral from Brown Algae Extract using Micro Filtration (MF) and Ultra Filtration (UF) Membrans – Review Mahreni, Mahreni Anti Kanker Ekstraksi Fucoidan Mikro Filtrasi Ultra Filtrasi Brown algae (Phaeophyta) contain active compounds such as carbohydrates, proteins, phenolics, fats, pigments, vitamins and minerals. The mineral content of brown algae is around 8% to 40% consisting of cations Na+, K+, Mg++, Fe++, Zn++, Mn++ and heavy metals. Bioactive brown algae has many benefits, including Fucoidan as a cancer drug. The barrier of using Fucoidan as a medicine is its high mineral content. Therefore, the minerals must be separated. The extraction process of brown algae using various methods has been carried out with the aim of isolating the active component of Fucoidan that is free from minerals that will be an obstacle in utilizing the active component. This paper will describe some of the latest methods of extracting the active ingredients of brown algae and mineral separation processes using Micro Filtration (MF) and Ultra Filtration (UF) membrane. MF and UF membrane can separate small molecules such as cations (minerals) that can pass through the membrane so that macromolecules such as carbohydrates, fats, proteins, pigments, phenolics and vitamins can be separated from minerals and active ingredients in the absence of minerals can be obtained. The purpose of this paper is to provide research directions in the exploration of the active ingredients of brown algae for pharmaceutical and cosmetic applications without side effects caused by high metal or mineral content above the threshold value in brown algae extracts. Prodi Teknik Kimia UPN "Veteran" Yogyakarta 2022-04-05 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article application/pdf https://jurnal.upnyk.ac.id/index.php/eksergi/article/view/6653 10.31315/e.v19i1.6653 Eksergi; Vol. 19 No. 1 (2022); 20-28 Eksergi; Vol 19 No 1 (2022); 20-28 2460-8203 1410-394X 10.31315/e.v19i1 ind https://jurnal.upnyk.ac.id/index.php/eksergi/article/view/6653/pdf Copyright (c) 2022 Mahreni Mahreni Ahmad, M.T., Ph.D

oai:jurnal.upnyk.ac.id:article/6862 2022-11-07T10:12:47Z eksergi:ART driver

Utilization of Nanochitosan as Adsorbent of Mercury (Hg) in Gold Ore Processing Waste Himawan, Nadhifa Aliyya Darmokoesoemo, Handoko Ardiarto, Totok Prasetya, A. Budi Ali, Badrud Tamam Ibnu Mercury pollution in gold ore processing wastewater can cause environmental and health problems. A large amount of mercury pollution causes neurological disease, paralysis, loss of sense of taste, irregular speech, and death. One effective method to reduce mercury amount in the environment is adsorption. Adsorption performance is affected by several factors such as surface area of material, deacetylation degree (DD), and adsorption condition, which is indicated by contact time and mercury concentration. Nanochitosan is used in this research. Effect of deacetylation degree (85%; 87%; 95%), contact time (30;60;90;120 minutes), and variation of mercury concentration (5;10;15;20;25;30 ppm) on adsorption performance was investigated in this research. Nanochitosan in this research is characterized by FTIR, SEM-EDX, BET-BJH, and pH PZC. AAS measures adsorption performance in this research. The result shows that nanochitosan, which has the best adsorption performance, is nanochitosan with a deacetylation degree of 95%, at a contact time of 60 minutes, and mercury concentration is 15 ppm. Prodi Teknik Kimia UPN "Veteran" Yogyakarta 2022-08-17 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article application/pdf https://jurnal.upnyk.ac.id/index.php/eksergi/article/view/6862 10.31315/e.v19i2.6862 Eksergi; Vol. 19 No. 2 (2022); 82-90 Eksergi; Vol 19 No 2 (2022); 82-90 2460-8203 1410-394X 10.31315/e.v19i2 eng https://jurnal.upnyk.ac.id/index.php/eksergi/article/view/6862/pdf Copyright (c) 2022 Nadhifa Aliyya Himawan

oai:jurnal.upnyk.ac.id:article/7207 2022-11-18T06:48:30Z eksergi:ART driver

The Effect of Contact Time Variation and Dosage of NaOH-Activated Fly ash on Adsorption of Methylene Blue Pengaruh Variasi Waktu Kontak dan Dosis Adsorben Fly ash teraktivasi NaOH terhadap Adsorpsi Metilen Biru Morentera, Brilian Gema Wahyuningsih, Sri Sudarni, Dyan Hatining Ayu absorbansi adsorpsi fly ash metilen biru spektrofotometri A rapid growth of  textile industry creates a new problems  on environment, one of those is the presence of dye waste. Methylene blue is one of the dyes which is toxic to living things, one of those triggers cyanosis for human and bother photosyntesis  of algae. Therefore, it needs the effort to reduce, one of those is by adsorption. This study aims to determined the effect of dosage adsorbent variation and contact time variation to adsorb methylene blue. Adsorption is an adsorbate molecule absorption process that occurs on the surface of the adsorbent. This study used fly ash from PG. Pagottan and has been activated by NaOH. Measure method of this study using UV-Vis Spectrophotometry to measure concentration of methylene blue at maximum wavelenght. Based on data, NaOH-activated fly ash and non-activated fly ash  following Langmuir isotherm adsorption, it mean a monolayer site is formed. Adsorption capacity also increase after activation, it about 21,74 mg/g to 23, 25 mg/g. Based on the study fly ash has a potential as a new adsorbent.  Pertumbuhan industri menimbulkan masalah yang baru terhadap lingkungan salah satunya adalah adanya limbah warna. Metilen biru merupakan pewarna tekstil yang berbahaya bagi makhluk hidup salah satunya pemicu sianosis bagi manusia dan dapat mengganggu fotosintesis bagi tumbuhan air. Oleh karena itu perlu dilakukan upaya untuk mengatasi hal tersebutsalah satunya dengan adsorpsi.Metode adsorpsi menggunakan fly ash PG.Pagottan  yang telah diaktivasi dengan NaOH 2M untuk menyerap metilen biru. Penelitian ini bertujuan untuk mengetahui pengaruh variasi massa adsoren dan variasi waktu kontak terhadap absorbansi metilen biru sebelum aktivasi dan sesudah aktivasi. Metode pengukuran menggunakan spektrofotometri UV-Vis Genesys-10. Hasil penelitian menunjukkn bahwa persen removal terbaik untuk penyerapan metilen biru dengan konsentrasi 0,03 g/L adalah fly ash Berdasarkan data dapat diketahui  fly ash aktivasi dan non aktivasi mengikuti model  isoterm Langmuir yang berarti terbentuk monolayer adsorpsi dengan R2 0,987dan R 2 0,677 untuk non aktivasi untuk aktivasi NaOH 2M. Kapasitas adsorbsi fly ash juga mengalami peningkatan setelah aktivasi yaitu 21,739  mg/gram menjadi 23, 255 mg/gram teraktivasi NaOH dengan dosis 0,2 gram selama 10 menit  yang dapat mengadsorpsi sebesar 100%. Prodi Teknik Kimia UPN "Veteran" Yogyakarta 2022-11-15 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article application/pdf https://jurnal.upnyk.ac.id/index.php/eksergi/article/view/7207 10.31315/e.v19i3.7207 Eksergi; Vol. 19 No. 3 (2022); 104-109 Eksergi; Vol 19 No 3 (2022); 104-109 2460-8203 1410-394X 10.31315/e.v19i3 ind https://jurnal.upnyk.ac.id/index.php/eksergi/article/view/7207/pdf Copyright (c) 2022 Brilian Gema Morentera, Sri Wahyuningsih, Dyan Hatining Ayu Sudarni

oai:jurnal.upnyk.ac.id:article/7245 2022-11-07T10:12:47Z eksergi:ART driver

Comparison of the Use of NaOH and KOH Activators in the Manufacture of Activated Carbon from Cassava Peel (Manihot utilissima) Puspitasari, Mitha Nandari, Wibiana Wulan Hadi, Faizah activator NaOH KOH activated carbon peel cassava Cassava (Manihot utilissima) is a staple food beside rice and corn for Indonesia people. Cassava peel is a waste of cassava processing agroindustries such as  tapioca flour industry, fermentation industry, and staple food industry. This waste contains a fairly high carbon element of 59,31%. Cassava peel has the potential to be used as raw material for activated carbon because of its high carbon content. Activated carbon production involved some steps such as preparing raw materials, carbonization, activation, neutralization, and analysis of water content, ash, iodine number, and analysis of the pore surface area of activated carbon. Activated carbon was activated using NaOH and KOH with concentrations of 0.1; 0,2; 0,3; 0,4; and 0,5N. The results showed that activated carbon which activated with 0,4N NaOH and 0,5N KOH provided the closest parameter with SNI 06-3730-1995 standard. The use of NaOH activator can increase the surface area of activated carbon compared to KOH activator. Prodi Teknik Kimia UPN "Veteran" Yogyakarta 2022-08-28 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article application/pdf https://jurnal.upnyk.ac.id/index.php/eksergi/article/view/7245 10.31315/e.v19i2.7245 Eksergi; Vol. 19 No. 2 (2022); 58-62 Eksergi; Vol 19 No 2 (2022); 58-62 2460-8203 1410-394X 10.31315/e.v19i2 ind https://jurnal.upnyk.ac.id/index.php/eksergi/article/view/7245/pdf Copyright (c) 2022 Mitha Puspitasari

oai:jurnal.upnyk.ac.id:article/7267 2022-11-18T07:21:43Z eksergi:ART driver

Verification of the Walkley Black Method Test for Determination of Organic Carbon Elements in Palm Oil Empty Fruit Bunch Waste Fertilizer Umar, Wakhid Khoirul Agustiyar, Fandika Rahma, Aulia Organic Carbon Method Verification Oil Palm Empty Fruit Bunches Walkley Black Verification of the organic carbon method on organic fertilizer from Palm Oil Empty Fruit Bunches (TKKS) waste using a UV-Vis Spectrophotometer has been carried out. The determination of this OPEFB fertilizer refers to the AOAC (2000) with the Walkley Black method. The results of the organic carbon test on OPEFB fertilizer show the correlation coefficient (r) value obtained is 1.0000, and the % relative standard deviation (RSD) value of 0.4022% means that the value is below 2/3 CV Horwitz of 4.7230. accuracy with a value of 106.99%. The method limit value (LOD) is 2.4531, and the quantization limit value (LOQ) is 8.1769. The instrument limit value (LOD) is 2.4990, and the quantification limit value (LOQ) is 8.3299; the test results indicate that it has complied with the conditions with acceptance. The test results for determining organic carbon in OPEFB fertilizer using the Walkley Black method with UV-Vis Spectrophotometer showed valid results, so the method could be used. Prodi Teknik Kimia UPN "Veteran" Yogyakarta 2022-08-10 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article application/pdf https://jurnal.upnyk.ac.id/index.php/eksergi/article/view/7267 10.31315/e.v19i3.7267 Eksergi; Vol. 19 No. 3 (2022); 97-103 Eksergi; Vol 19 No 3 (2022); 97-103 2460-8203 1410-394X 10.31315/e.v19i3 ind https://jurnal.upnyk.ac.id/index.php/eksergi/article/view/7267/pdf Copyright (c) 2022 Wakhid Khoirul Umar, Fandika Agustiyar

oai:jurnal.upnyk.ac.id:article/7286 2022-11-07T10:12:47Z eksergi:ART driver

Mass Transfer Coefficient Extraction of Oleoresin from Zodia Leaf (Evodia suaveolens) with Ethanol Solvent Using Ultrasonic Cleaner Siswanti, Siswanti Saviatri, Ratri Adi Pratama, Jeremy The Aedes sp mosquito is a vector of Dengue Hemorrhagic Fever (DHF) and chikungunya which are still commonly found in Indonesia. To control DHF, natural insecticides from plants can be used. Zodia plants (Evodia suaveolens) can be used as natural insecticides because they contain essential oils that mosquitoes do not like. To obtain oleoresin with optimal quality and quantity, extraction can be carried out using ultrasonic waves. To design an efficient extractor, mass transfer coefficient data is needed. Until now, the data is still difficult to obtain. The experiment was carried out using an ultrasonic cleaner, by observing the concentration of oleoresin for various leaf mass ratios of 4, 6, 8, 10, and 12 grams, extracted with 300 mL ethanol for 900 seconds. Concentration observations were also carried out for a time variation of 90 - 900 seconds, with 90 seconds intervals. The best extraction results were tested using GC-MS, to determine the components in the oleoresin. To determine the mass transfer coefficient (Kc) is to make a relationship between concentration and time for the best ratio of leaf weight and ethanol volume.Based on research that has been done with 300 mL of ethanol and extraction time of 900 seconds, the highest concentration was 0.0120 gr/mL, for the experiment using a leaf weight of 12 gr. The largest percentage (%) of oleoresin that could be extracted was 88.5%, for the experiment the leaf weight was 2 g. The optimum mass transfer coefficient (Kc) is 0.161088 1/minute. These data were obtained for the experiment of the relationship between concentration and time. Oleoresin from Zodia leaves contains 20.61% nerolidol. This compound has effectiveness as a mosquito repellent. Prodi Teknik Kimia UPN "Veteran" Yogyakarta 2022-07-26 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article application/pdf https://jurnal.upnyk.ac.id/index.php/eksergi/article/view/7286 10.31315/e.v19i2.7286 Eksergi; Vol. 19 No. 2 (2022); 63-70 Eksergi; Vol 19 No 2 (2022); 63-70 2460-8203 1410-394X 10.31315/e.v19i2 eng https://jurnal.upnyk.ac.id/index.php/eksergi/article/view/7286/pdf Copyright (c) 2022 Siswanti Siswanti, Ratri Saviatri, Jeremy Adi Pratama

oai:jurnal.upnyk.ac.id:article/7405 2022-11-18T06:48:29Z eksergi:ART driver

Effect of Alum Dose in the Coagulation Process for Decreasing the Pollutant in the Palm Oil Mill Effluent: Experimental and Kinetic Analysis Syaichurrozi, Iqbal Jayanudin, Jayanudin Sari, Listiyani Nurwindya Apriantika, Anellysha Putri Alum Kinetika Koagulasi POME Palm oil mill effluent (POME) is palm oil processing industrial waste that cannot be discharged directly into water bodies. Therefore, this waste must be treated. One method that can be used to treat it is coagulation. The purpose of this study was to investigate the effect of coagulant doses on the coagulation process for treating the POME through experimental and kinetic analysis. The alum dose was varied to 1, 3, 5, 10, 15 g/L. The volume of treated waste was 1 L. Before adding alum, the pH of POME was adjusted to 7.0 with the addition of technical grade NaOH. The coagulation process was carried out for 180 minutes at room temperature. Every 20 minutes, the pH of the liquid was measured and a fluid sample as much as ±50 mL was taken to be settled for 24 hours. Next, the total suspended solid (TSS) concentration in the supernatant was analyzed. The results showed that the addition of alum could decrease the liquid pH and increase the TSS of the liquid. The coagulation process for 180 minutes resulted in a TSS reduction efficiency of 33.3, 33.3, 37.1, 1.7, -17.8% at alum doses of 1, 3, 5, 10, 15 g/L respectively. The first-order kinetic model provided a better prediction than the second-order kinetic model with R2 values of 0.7876-0.9707 and 0.2746-0.8912, respectively. Prodi Teknik Kimia UPN "Veteran" Yogyakarta 2022-11-15 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article application/pdf https://jurnal.upnyk.ac.id/index.php/eksergi/article/view/7405 10.31315/e.v19i3.7405 Eksergi; Vol. 19 No. 3 (2022); 91-96 Eksergi; Vol 19 No 3 (2022); 91-96 2460-8203 1410-394X 10.31315/e.v19i3 eng https://jurnal.upnyk.ac.id/index.php/eksergi/article/view/7405/pdf Copyright (c) 2022 Iqbal Syaichurrozi, Jayanudin Jayanudin, Listiyani Nurwindya Sari, Anellysha Putri Apriantika

oai:jurnal.upnyk.ac.id:article/7542 2022-08-15T04:33:34Z eksergi:ART driver

Simulasi Siktus Refrijerasi Satu, Dua, dan Tiga Tahap dengan HYSYS 3.2. Putranto, Aditya Penggunøan sikus refriijerasi semakin meningkat dalam industri kimia untuk penyediaan chilled water. Pada makalah ini disimulasikan siklus refrijerasi satu tahap, dua tahap, dan tiga tahap dengøn HYSYS 3.2. Beberapa data dimasukkan agar tercapai derajat kebebasan (degree of freedom) sama dengan 0. Neraca massa dm energi terhìtung dengan bantuan sortware HYSYS 3.2. dan diamati profìl beban kondensor, kompresor, dan evaporator terhadap berbagai variable yang berpengaruh. Berdasarkan hasil simulasì, beban kondensor, evaporator dan kompresor dipengaruhi oleh tekanan kondensoi tekanan evaporstoti dan tekanan interstage. Prodi Teknik Kimia UPN "Veteran" Yogyakarta 2022-08-09 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article application/pdf https://jurnal.upnyk.ac.id/index.php/eksergi/article/view/7542 10.31315/e.v9i1.7542 Eksergi; Vol. 9 No. 1 (2008): Versi Cetak; 1-5 Eksergi; Vol 9 No 1 (2008): Versi Cetak; 1-5 2460-8203 1410-394X 10.31315/e.v9i1 eng https://jurnal.upnyk.ac.id/index.php/eksergi/article/view/7542/pdf Copyright (c) 2022 Aditya Putranto

oai:jurnal.upnyk.ac.id:article/7543 2022-08-15T04:33:34Z eksergi:ART driver

Kinetika Pengolahan Limbah Cair Industri Tahu secara Biologi Menggunakan Biofilm dengan Sistem Batch Jaya, Danang Sulistyawati, Endang Industri talru menghasilkan limbah cair yang bersifat biodegradable sehingga dapat diurai secara biologi dengan menggunakan mikroorgaínsme. Penelitian ini mempelajari kìnetika pertumbuhan bakteri Bacillus sphaerícvs dalam limbah cair orgonik tahu. Penelítían diløkukan dengan mengembangbiakkan bakteri Bacílllussphaericas dalam larutan 5,5 gram  nuttrìen Agar dan l00mL aquades selama 44jam, dimasukkan kedalam 500 mL limbah cair tahu yang berisi 20 buah batu apung. Setiap selang waktu I atau 2 jam, diømbÍl I buah batu apung dan I0 mL substrat untuk diamatí absorbansinya menggunakan spectronic 20", sehingga dþerclehkonsentrasi bakleri dan konsentrasi substrat (dalam mg/mL). Parameter yang dipelajari adalah pengruh perubahan pH pada air limbah terhadap konstanta kecepatan pertumbuhan bakteri. Dari hasil penelitîan didapat nilai konstanta laju pertumbuhan spesifik keadaan jenuh (0.403 / jam), dan yield terbesar (0.593) pada pH7,5 yang merupakan pH optimum pertumbuhan bakteri Bocillussphaericus. Prodi Teknik Kimia UPN "Veteran" Yogyakarta 2022-08-09 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article application/pdf https://jurnal.upnyk.ac.id/index.php/eksergi/article/view/7543 10.31315/e.v9i1.7543 Eksergi; Vol. 9 No. 1 (2008): Versi Cetak; 6-10 Eksergi; Vol 9 No 1 (2008): Versi Cetak; 6-10 2460-8203 1410-394X 10.31315/e.v9i1 eng https://jurnal.upnyk.ac.id/index.php/eksergi/article/view/7543/pdf Copyright (c) 2022 Danang Jaya

oai:jurnal.upnyk.ac.id:article/7545 2022-08-15T04:33:34Z eksergi:ART driver

Sintesa Kalsium Karbonat Presipitat Ariono, Carnila D Calcium carbonate is one of the chemical substances, which is largely used in chemical industries such as coating and fìlters in paper, toothpaste, paint etc. Based on bulk density, this substance is classified into two kinds, which are light and heavy calcium carbonate. The need of calcium carbonate especially the light type is increased with the development of the chemical industries, but the domestic production of calcium carbonate cannot fulfill this need, so still needs to be improved. Precipitated calcíum carbonate (PCC) is the light type of high purity of calcium carbonate which is yielded from precipitation processes. Lìght PCC has intenal bulk density between 0,15-0.60 g/cm'. Synthesis of PCC from límestone consist of calcination, hydration and carbonation processes. In the calcination process, Iimestone is burnt in a high temperature to form CaO. The calcination process is usually done by the small scale industry. In the hydration process, CaO react with water to form Ca(OH), solution. Then in the carbonation process, Ca(OH),react with CO2 to form light PCC.The experíment is focused in hydration and carbonatation processes has purpose to learn the ffict of ratio of CaO/HrO during hydration process and the effect of CO2, dilution by N, gas flow rate during carbonøtion process against percentage of CbaO converted to PCC. The result of this experiment are (l) maximum conversion of CaO to PCC is 50% and (2) the quality of product light PCC has fulfilled the specification for paper filler Prodi Teknik Kimia UPN "Veteran" Yogyakarta 2022-08-09 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article application/pdf https://jurnal.upnyk.ac.id/index.php/eksergi/article/view/7545 10.31315/e.v9i1.7545 Eksergi; Vol. 9 No. 1 (2008): Versi Cetak; 11-15 Eksergi; Vol 9 No 1 (2008): Versi Cetak; 11-15 2460-8203 1410-394X 10.31315/e.v9i1 eng https://jurnal.upnyk.ac.id/index.php/eksergi/article/view/7545/pdf Copyright (c) 2022 Carnila D Ariono

oai:jurnal.upnyk.ac.id:article/7546 2022-08-15T04:33:34Z eksergi:ART driver

Model Matematika dan Simulasi Untuk Non-Idealitas Reaktor Alir Pipa Gunarto, Gunarto This paper presents a mathematical model for the performance of a non-ìdeality plugflow reactor. An analytical technique used was the residence time distribution (RTD) involving tracer component. This model can give a prediction of the number of the ideal continuous stirred tank reactors that could represent the non-ideal plug flow reactor. Regardíng to the literature, the result obtained is 9 continuous stirred tank reactors in series would represent the performance of non-ideal plugflow reactor that was analyzed Prodi Teknik Kimia UPN "Veteran" Yogyakarta 2022-08-09 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article application/pdf https://jurnal.upnyk.ac.id/index.php/eksergi/article/view/7546 10.31315/e.v9i1.7546 Eksergi; Vol. 9 No. 1 (2008): Versi Cetak; 16-21 Eksergi; Vol 9 No 1 (2008): Versi Cetak; 16-21 2460-8203 1410-394X 10.31315/e.v9i1 eng https://jurnal.upnyk.ac.id/index.php/eksergi/article/view/7546/pdf Copyright (c) 2022 Gunarto Gunarto

oai:jurnal.upnyk.ac.id:article/7547 2022-08-15T04:33:34Z eksergi:ART driver

Penggunaan Chlorella sp. sebagai Alternatif untuk Mengolah Limbah Cair Industri Pengolahan Susu Pratiwi, Yuli One of methods of treating waste in the most efective and chepest way is by biological method because it utilize mícrobes that are abundant in natural etwironment. Microbe actívities can be utilízed to produce a system that can accomplish recycling process, so they can control the quality of waste. This research is aimed to carry out test by utilizing microbes Chlorella sp. that is belonged to phytoplanktons that are used as innoculum for treating waste miIk industry. The research was conducted at the Environmental Technical Laborotory of ISTA Yogtøkortarta for 3 months, wíth activities starting from Chlorella sp. culturing, preliminary research for determining the concentration of optimal inocallum growth to the main research, the application of Chlorella sp. for milk waste treatment. From the result of research, it was evident that milkwaste milk Índustry exerted positive influence on the growth of Chlorella sp. that could reached optimal rate. The optimal growth rate, in turn, could be utilized to improve milkwaste quality, especially to reduce BOD, soluble CO, and to íncrease DO as well as to neutralize pH. Other efect of optimal Chlorellasp. growth was that protozoa populatíon growth that sustain and acceleratethe treatment of this milkwaste. Prodi Teknik Kimia UPN "Veteran" Yogyakarta 2022-08-09 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article application/pdf https://jurnal.upnyk.ac.id/index.php/eksergi/article/view/7547 10.31315/e.v9i1.7547 Eksergi; Vol. 9 No. 1 (2008): Versi Cetak; 22-26 Eksergi; Vol 9 No 1 (2008): Versi Cetak; 22-26 2460-8203 1410-394X 10.31315/e.v9i1 eng https://jurnal.upnyk.ac.id/index.php/eksergi/article/view/7547/pdf Copyright (c) 2022 Yuli Pratiwi

oai:jurnal.upnyk.ac.id:article/7548 2022-08-15T04:33:34Z eksergi:ART driver

Pengaruh Aktivasi Bentonit Wonosegoro terhadap Perbaikan Sifat Fisis Minyak Pelumas Bekas Industri Haryono, Gogot Bentonit is a kind of ore which has a high adsorption power due to its hígh content of montmorilonit. Its wìdely used in many applications as well as an activated carbon. In fact, activated bentonit can improve physical properties of used lubrícant oil partially its Rëdwood vìscocity, flash point and carbon residue. In this research, the activation procceses including heating, pressurizing and acíd methods. Such methods were conducted ìn a muffle burner (at temperature of 280, 300, 320, 340, 360 and 38 degree C, ín a pressure vessel (at pressures of 1.75; 2.23; 2.54; 2,66; and 3.02 atm), and three neck bottles (at acid concentrations of 0.1; 0.2; 0.3; 0.4 and 0.5 N), respectìvely. The activated bentonit was thereafter tested to absorp a quantity of sample used lubricant oil. From these experiments, it was concluded that activated bentonit can increase the Redwood viscocity and flash poínt of used lubrícant oil and also decrease its carbon residue. The optimum temperature, pressure and acidconcentratíon obtainedwere 36tC, 2.66 atm and 0.4 N, respectively. At this condition, the used lubricant oil had a Redwood víscocity 125.9 cP, flash point of 112 degree C and carbon residue of 22.05%. Prodi Teknik Kimia UPN "Veteran" Yogyakarta 2022-08-09 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article application/pdf https://jurnal.upnyk.ac.id/index.php/eksergi/article/view/7548 10.31315/e.v9i1.7548 Eksergi; Vol. 9 No. 1 (2008): Versi Cetak; 27-31 Eksergi; Vol 9 No 1 (2008): Versi Cetak; 27-31 2460-8203 1410-394X 10.31315/e.v9i1 eng https://jurnal.upnyk.ac.id/index.php/eksergi/article/view/7548/pdf Copyright (c) 2022 Gogot Haryono

oai:jurnal.upnyk.ac.id:article/7549 2022-08-15T04:33:34Z eksergi:ART driver

Simulasi Enhancement Factor untukAbsorpsi Gas disertai Reaksi Kimia Reversibel Orde Dua Kondisi Non Isotermal dengan Model Difusitas Eddy Indrasari, Yunita D Serpara, Koatlely Altway, Ali Proses absorpsi gas ke dalam liquida seríngkali dijumpai dalam dunia industri. Proses ini dilakukan untuk memisahkan suatu komponen yang tidak diinginkan dan untuk mendapatkan suatu senyawa yang merupakan hasil reaksi. Proses absorpsi di industri.umumnya adalah absorpsi secara kimia yang dilakukan dalam packed column atau bubble column dengan aliran counter current. Reaksi kimia dapat terjadi secaraineversibel atau reversibel. Pada kondisi nyatq proses absorpsi gas terjadi pada kondisi non isotennal yang sangat dipengaruhi oleh panas pelarutan gas. Pengaruh panas dan reaksi kimiaterhadap laju absorpsi dinyatakan dengan enhancement factor. Beberapa penelitian terdahulu tentang enhancement factor untuk absorpsigas pada kondisi non isotermal terbatas pada pemakaian model film dan model higbie. Model film cukup sederhana namun kurang realistis dengan asumsi film stagnan. Model higbie cukup realistis namun melibatkan persaamaandifusivitas unsteady state yang rumit. Pada simulasi ini penelitian dikembangkan dengan model difusivitrs eddyuntuk reaksi orde dua. Model ini cukup realistis namun sederhana. Tujuan dari penelitian ini adalah permodelan matematis untuk menentukan faktor peningkatanabsorpsi gas dalam larutan yang disertai reaksi reversibel orde dua dalam kondisi non isotermal dengan model difusivitas eddy. Penelitian dilakukan secara teoritis dengan simulasi menggunakan program matlab dimana perumusan harga enhancement factor diturunkan dari persamaan dasar absorpsi dengan menggunakan model difusivitas eddy. Harga-harga variabel yang ditinjau pada penelitian ini adalah perbandingan rate difusi A terhadap rate difusi B (S) 0.01 0.0125, bilangan hatta 0 antara I 100, energi aktivasi difusi 0 4 -2 ,energi aktivasi reaksi 0 5, energi aktivasi pelarutan 0 0 - 1.5, panas pelarutan 0 dan panas reaksi 0 0.001 0.003, konstanta kesetimbangan (K) 10 - 15, ratio konsentrasi (L) 100, dan ratio difusi (T) LReynolds number 5000 (Tak berdimensi). Dari penelitian yang telah dilakukan didapatkan bahwa harga enhancement factor dipengaruhi oleh harga S dan bilangan hatta. Semakin besar bilangan hatta cenderung akan mempercepat laju absorpsi. Dan diperoleh bahwa dengan model difusivitas eddy, harga enhancement factor yang didapatkan lebih besar daripada dengan menggunakan model film. Panas kelarutan, panas reaksi, dan energy aktivasi memiliki andil tersendiri dalam mempengaruhi harga enhancement factor. Prodi Teknik Kimia UPN "Veteran" Yogyakarta 2022-08-09 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article application/pdf https://jurnal.upnyk.ac.id/index.php/eksergi/article/view/7549 10.31315/e.v9i1.7549 Eksergi; Vol. 9 No. 1 (2008): Versi Cetak; 32-35 Eksergi; Vol 9 No 1 (2008): Versi Cetak; 32-35 2460-8203 1410-394X 10.31315/e.v9i1 eng https://jurnal.upnyk.ac.id/index.php/eksergi/article/view/7549/pdf Copyright (c) 2022 Yunita D Indrasari, Koatlely Serpara, Ali Altway

oai:jurnal.upnyk.ac.id:article/7551 2022-08-15T04:33:34Z eksergi:ART driver

KOEFISIEN TRANSFER MASSA PADA PENGAMBILAN MINYAK ATSIRI KAYU MANIS SECARA EKSTRAKSI MENGGUNAKAN PELARUT N-HEKSAN Widayati, Tunjung Wahyu Setyoningrum, Tutik Muji Pada proses ekstraksi dìiumpai-peristiwa perpindahan (transfer) massa, dimana perbedaan konsentrasi yørg semakin besar berpengaruh terhadap proses transfer yang semakìn cepat, sehíngga diperoleh koefisien transfer massayang semakìn besar pula. Teknologi mínyak atsiri berkembang sangat pesat, sèhíngga díbutuhkan alat ekstraktor yang efìsíen dan efektif dalam pengoperasiannya.Tuiuan dari penelitian ini adalah untuk mencari hubungan antara kecepatan alíran dan tinggì tumpukan padatan terhadap koefìsien transfer massa pada ekstraksí padat-caír dalam kolom fixed-bed. Penelitian ini menggunakan serbuk dengan ukuran -/,8 + i0 mesh dari daun dan ranting køyu mønis dengur tinggì tumpukan tertentu yang dimasukan ke dalam kolom fixed-bed menggunakan-Heksan yang d¡alirkan kedalam kolom dengan kecepatan alír tertentu. Ukuran butiran kayu manis yang digunakan adaiah 18+30 mesh.Kecepatan aliran n-Heksana yang digunakan adalah 2,3829 cm/detik; 2,9197 cm/detik; 3,9932 cm/detik; 4,3957cm/detik; 4,798 cm/detik. Tinggi tumpukan padatan yang digunakan adalah 5 cm, 6 cm, 7 cm, I cm, g cm, I0 cm. Prodi Teknik Kimia UPN "Veteran" Yogyakarta 2022-08-09 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article application/pdf https://jurnal.upnyk.ac.id/index.php/eksergi/article/view/7551 10.31315/e.v9i1.7551 Eksergi; Vol. 9 No. 1 (2008): Versi Cetak; 36-41 Eksergi; Vol 9 No 1 (2008): Versi Cetak; 36-41 2460-8203 1410-394X 10.31315/e.v9i1 eng https://jurnal.upnyk.ac.id/index.php/eksergi/article/view/7551/pdf Copyright (c) 2022 Tunjung Wahyu Widayati, Tutik Muji Setyoningrum

oai:jurnal.upnyk.ac.id:article/7552 2022-08-15T04:33:34Z eksergi:ART driver

LAJU PERTUMBUHAN MIKROBIA PADA PENGOLAHAN LIMBAH CAIR TEMPE MENGGUNAKAN SISTEM BIOFILM Sulistyawati, Endang gunarto, Gunarto Límbah cair industri tempe bersifat biodegradable, sehingga dapat diuraí secara biologi. Pengoløhanyang dÍcobakan adalah sistem biofilm. Percobaan dilakukan dengan mengembangbíakkan Bakteri Bachillus Sphaericus menggunakan nutrisi MRS Broth dalam aquades dan media biofìlm batu apung yang dimasukkan dalam limbah. Laju pertumbuhan bakteri diamati pada variasi suhu 29C, 40C, 50C dan 60C pada fase pertumbuhan cepat. Hasil analísís data dengan pendekatan bahwa reaksi yang terjadimengikuti reaksi katalitik orde satu diperoleh persamaan laju pertumbuhan mikroba sebagai fungsi suhu sebagai r= 1,75 x 10^8 e^(-13.2/RT)xS. Prodi Teknik Kimia UPN "Veteran" Yogyakarta 2022-08-09 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article application/pdf https://jurnal.upnyk.ac.id/index.php/eksergi/article/view/7552 10.31315/e.v9i1.7552 Eksergi; Vol. 9 No. 1 (2008): Versi Cetak; 42-46 Eksergi; Vol 9 No 1 (2008): Versi Cetak; 42-46 2460-8203 1410-394X 10.31315/e.v9i1 eng https://jurnal.upnyk.ac.id/index.php/eksergi/article/view/7552/pdf Copyright (c) 2022 Endang Sulistyawati, Gunarto gunarto

oai:jurnal.upnyk.ac.id:article/7553 2022-08-15T04:33:34Z eksergi:ART driver

PENGARUH KONSENTRASI ABSORBEN (Fe-EDTA) TERHADAP PENURUNAN KANDUNGAN H2S DALAM BIOGAS PADA LAJU ALIR UDARA REGENERASI YANG BERBEDA Kwartiningsih, Endang Jumari, Arif Nur, Adrian Nugroho, Danu Sarwanti, Umi Sapto, Slamet Ari, Endah Bíogas is very potential to be used as fuel because of its high content of methane. Biogas had also been developed and used by several industries as alternative fuels to substitute mineral oil, The disadvantage of biogas as fuel was its high content of hydrogen sulfide which is potentíal to pollute the ervironment. Because of this, biogas should be purified first before being used as fuel. Generally, the content of H2S can bereduced physically, chemically or biologically methods, but these methods have many disadvantages. Biogas purílìcation(also other gases) from the content of H2S using Fe-EDTA(Iron Chelated Solution) gave several advantages. The advantages were the absorbent solution can be regenerated that means a cheap operation cost, the separated sulfur was asolid (that is an economic commodity) or resídue that is easy to handle and is save to be disposal to environment. Iron Chelated Solutionwas made by solving the substance of salted iron to EDTA solution. The salt of FeCl2, was made by solving iron waste obtained from lathe machine to hydrochloric acid solution. The research of reduction of the content of H2S in biogas was conducted by contacting Fe-EDTA solution with biogas in an absorber column of 1 m height and 0. I m diameter The rich H2S solution from absorber was then flowed to the separator column to separate the solid of sulfur and its solution. The solution from separator column was then regenerated by oxidation in regenerator column. In regenerator column solution which is rich of iron reacted with oxygen from air to be Fe3. . The solution which is rich of Fe was then used again to absorb H2S in biogas. Biogas used during experiment was obtained from PT Indo Acidatama Tbk. The content of H2S in raw biogas was 2.8235 %. The result of the research showed that the concentration of absorbent influenced the reduction of the content of H2S. Absorbent solution with concentration of 0.2 M of Fe-EDTA was able to absorb 99 % of all H2S from 2.8235 % to 0.02 % in a column of I m height and 0.1 m diameter Absorbent solution with concentratíon of 0.1 M of Fe-EDTA was only able to absorb 59% of all H2S from 2.8235% to 1.2 %. The regeneration air flow rate also influence the reduction of the content of H2S in biogas. The higher the regeneration airflow rate the higher the reduction of the content of H2S. Prodi Teknik Kimia UPN "Veteran" Yogyakarta 2022-08-09 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article application/pdf https://jurnal.upnyk.ac.id/index.php/eksergi/article/view/7553 10.31315/e.v9i1.7553 Eksergi; Vol. 9 No. 1 (2008): Versi Cetak; 47-51 Eksergi; Vol 9 No 1 (2008): Versi Cetak; 47-51 2460-8203 1410-394X 10.31315/e.v9i1 eng https://jurnal.upnyk.ac.id/index.php/eksergi/article/view/7553/pdf Copyright (c) 2022 Endang Kwartiningsih, Arif Jumari, Adrian Nur, Danu Nugroho, Umi Sarwanti, Slamet Sapto, Endah Ari

oai:jurnal.upnyk.ac.id:article/7554 2022-08-15T04:33:34Z eksergi:ART driver

KOEFISIEN PERPINDAHAN PANAS KONVEKSI PADA PEMISAHAN FRAKSI RINGAN MINYAK PELUMAS BEKAS Widayati, Tunjung Wahyu Achmad, Zubaidi Lubricant oil has límited time in its using. After ín that time, the oìl has been not aplicated so ít hasto be substìtuted with the another one. By forward wíth transportation, there wìll be pollution in environment. Inholding that problems, so the renewable processing used lubrícant oil is needed to be more ecommíc product. The process was done ín the separating equipment that was being heated 200-250"C wíth some pnæess ptameters.The parameters were 0.061 -0.0389 m/sec in flow rate, 170-230 degree C in the feeding temperature, 0.11 - 0.07 m in ã diameter of separation equipment, 77 -95.5'C in the diference temperature wíth in oíl and equipment wall. The feed from feed tank was flowed by pass heater and than its in to separation equipment. The product was dístilate, were analyzed in physic characterìzatíon í.e., specific gravity, viscosity, colour ASTM and flash point. The rafinate þottom product, heavy fractÍon, was put ín to feeding tank. The rafinøt was analyzed fisic characterization i.e., specítìc gratity, flash point, fire poínt¡ kinematic, viscosíty and viscosity índex. The rafinate analysis was done after the process was stopped. Prodi Teknik Kimia UPN "Veteran" Yogyakarta 2022-08-09 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article application/pdf https://jurnal.upnyk.ac.id/index.php/eksergi/article/view/7554 10.31315/e.v9i1.7554 Eksergi; Vol. 9 No. 1 (2008): Versi Cetak; 52-59 Eksergi; Vol 9 No 1 (2008): Versi Cetak; 52-59 2460-8203 1410-394X 10.31315/e.v9i1 eng https://jurnal.upnyk.ac.id/index.php/eksergi/article/view/7554/pdf Copyright (c) 2022 Tunjung Wahyu Widayati, Zubaidi Achmad

oai:jurnal.upnyk.ac.id:article/7555 2022-08-15T04:33:34Z eksergi:ART driver

Oksidasi Larutan Kalium Thiosulfat dalam Ekstrak Abu Tandan Sawit dengan Udara Haryono, Gogot Potossium sulphate is a kínd offertilizer whích nowadrys is still imported. The efortþr producing itfromdiferentfeedstockwås irwestigatedby many researchers. ThÍs researchwas an ahernativeway toproducepotassium sulphatefrom ash of empty palm-bunch. This objective ofthis researchwas particularly to studythe kinetic ofoxidationreaction ofpotassium sulphate productionfrom actract of ash ofempty palm-bunch,The æperíment was conducted by/ìlling the reactor with a potassium thiosulphate solution and thereþrebubbling air from bottom of the reactor with specitìed flow røe until steady condition was attained Theproductwas ønd analyzed at several certain time intervals. Iodometric methodwas appliedþr thiosulplwteanalysis and grartimetric method for sulphate analysis The øcperimental results showed that oxidationreaction rate of thiosulphate to sulphate was controlled by the reaction step, Temperature dependence ofthe rate constant consìdered by Arrhenius' Prodi Teknik Kimia UPN "Veteran" Yogyakarta 2022-08-09 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article application/pdf https://jurnal.upnyk.ac.id/index.php/eksergi/article/view/7555 10.31315/e.v9i1.7555 Eksergi; Vol. 9 No. 1 (2008): Versi Cetak; 60-64 Eksergi; Vol 9 No 1 (2008): Versi Cetak; 60-64 2460-8203 1410-394X 10.31315/e.v9i1 eng https://jurnal.upnyk.ac.id/index.php/eksergi/article/view/7555/pdf Copyright (c) 2022 Gogot Haryono

oai:jurnal.upnyk.ac.id:article/7556 2022-08-15T04:33:34Z eksergi:ART driver

Modulus Patah dan Penyerapan Air pada Genteng Beton dari Tbas, Batu Apung dan Kapur Padam dengan Variasi Nuri, Wasir Di Indonesiaîerdapat sumber dryø alamyang cakup baryak antara lain tras, batu apung danbatu kapun bahan tersebut dapat digunakan sebagaí bahan bangunan, jika ketiga bahan tersebatdicampur dan dítambah air maka akan menjadi keras dan cuhrp htat dígunakon sebagai bahan bongunan.Penelitían ini bertujuan mencari modulrc patah dan penyerapan air yang memenuhí Standard InùtstriIndonesia pada genteng beton dari campuran tras, batu apung dan kapur padam dengan varíasikomposisi. Campuran tras dan kapur pødamr dengan perbandingan 10 : 4 ditambah batu apung dengankomposisi bemaríasi dari nol sompaí dengan 42,5 prosen berat, dengan ukuran diameter butir lolosayakan 100 mesh dan 200 mesh, campuran ditambah aír sambil diaduk sampaí adonan menjadi plastßhemudíandicetakdenganukuranT,Sx6,6x2cm,sEnplekemudíandiperamselama2l hari,setelahkzringselaniunya dilalwkan uji terhadap modulus pøtah dan penyerapan ain Hasíl uji terhadap modulus pøahmalrsimum adalah 10,2 kg / cm'1 pada ukuran butir 200 mesh sedangkan peresapan terhadap aìr minimumadalah0,l6 gramper cm'padaukuranbutir I00meshdalamwaktu2t hari. Moduluspatah-danperesapanaír masih dibautah standart SII sebagai genteng beton, sehingga perlu penelitian lebih lanjut misalnyawaklu pemeraman atau ditambahkan semen Portland. Prodi Teknik Kimia UPN "Veteran" Yogyakarta 2022-08-09 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article application/pdf https://jurnal.upnyk.ac.id/index.php/eksergi/article/view/7556 10.31315/e.v9i1.7556 Eksergi; Vol. 9 No. 1 (2008): Versi Cetak; 65-69 Eksergi; Vol 9 No 1 (2008): Versi Cetak; 65-69 2460-8203 1410-394X 10.31315/e.v9i1 eng https://jurnal.upnyk.ac.id/index.php/eksergi/article/view/7556/pdf Copyright (c) 2022 Wasir Nuri

oai:jurnal.upnyk.ac.id:article/7557 2022-08-15T04:33:34Z eksergi:ART driver

Produksi Poli-β-hidroksibutirat (PHB) Menggunakan Bakteri Bulkhoderia cepacia Murni, Sri Wahyu Gunarto, Gunarto Poly-β-hydroxybutyrate (PHB) biodegradable plastics. Plastics have important roles nowadays. However, its non-biodegradable property potentially makes a great problem because of the accumulation of its waste. Therefore, many researches about biodegradable plastics have been developed. Poly-β-hydroxybutyrate (PHB) is an alternative material to produce biodegradable plastics. The objectives of this research are to study the production of PHB by using Bulkhoderia cepacia bacteria and soluble starch substrate and determine the kinetics parameters including maximum specific growth rate (μmaks), saturation constant (Ks), and yield ratio of product-to-bacterial cell (YP/X). Fermentation was conducted at room temperature by using Ramsay medium with soluble starch at certain concentrations. The starter of Bulkhoderia cepacia incubated for 24 hours was inoculated as many as 10% by volume. The PHB product and dry cell weight were analyzed at certain several time intervals. This experiment was repeated at variation of phosphate concentrations.This research showed that the optimum cell growth and PHB production was obtained at soluble starch concentration of 8 g/100 ml and growth period of 72 hours. At this condition, the results were the dry cell weight of 7.5 mg/ml and PHB concentration of 0.0095 mg/ml. The values of kinetics parameters were μ maks of 0.01292 g/ml. h, Ks of 0.2854 g/ 100ml, YP/X of 0.00143. The accumulation of PHB was optimum at limited phosphate concentration. It could be also concluded that Bulkhoderia cepacia was a non-effective bacteria to produce PHB. Prodi Teknik Kimia UPN "Veteran" Yogyakarta 2022-08-09 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article application/pdf https://jurnal.upnyk.ac.id/index.php/eksergi/article/view/7557 10.31315/e.v9i1.7557 Eksergi; Vol. 9 No. 1 (2008): Versi Cetak; 70-74 Eksergi; Vol 9 No 1 (2008): Versi Cetak; 70-74 2460-8203 1410-394X 10.31315/e.v9i1 eng https://jurnal.upnyk.ac.id/index.php/eksergi/article/view/7557/pdf Copyright (c) 2022 Sri Wahyu Murni, Gunarto Gunarto

oai:jurnal.upnyk.ac.id:article/7576 2022-08-15T04:33:16Z eksergi:ART driver

Metanolisis Minyak kelapa dengan Katalis Enzim Lipase dalam Bubuk Getah Pepaya (Carica Papaya Latex, CPL) Sukadarti, Sri Kholisoh, Siti Diyar This research was aimed to obtain an alternative way for manufacturing methyl ester which is cheaper with a quality that meets the standards. According to its availability and abundance in Indonesia, coconut palm oil was applied as the raw material and lipase enzyme in papaya latex was used as its catalyst. Prodi Teknik Kimia UPN "Veteran" Yogyakarta 2022-08-11 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article application/pdf https://jurnal.upnyk.ac.id/index.php/eksergi/article/view/1-5 10.31315/e.v9i1.7576 Eksergi; Vol. 9 No. 1 (2009): Versi Cetak Eksergi; Vol 9 No 1 (2009): Versi Cetak 2460-8203 1410-394X 10.31315/e.v9i1 eng https://jurnal.upnyk.ac.id/index.php/eksergi/article/view/1-5/pdf Copyright (c) 2022 Sri Sukadarti, Siti Diyar Kholisoh

oai:jurnal.upnyk.ac.id:article/7577 2022-08-15T04:33:16Z eksergi:ART driver

Koefisien Perpindahan Massa pada Ekstraksi Protein dari Biji Kecipir dengan Pelarut NaOH Pawignyo, Harso Siswanti, Siswanti Koefisien Perpindahan Massa pada Ekstraksi Protein dari Biji Kecipir dengan Pelarut NaOH. Prodi Teknik Kimia UPN "Veteran" Yogyakarta 2022-08-11 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article application/pdf https://jurnal.upnyk.ac.id/index.php/eksergi/article/view/6-10 10.31315/e.v9i1.7577 Eksergi; Vol. 9 No. 1 (2009): Versi Cetak Eksergi; Vol 9 No 1 (2009): Versi Cetak 2460-8203 1410-394X 10.31315/e.v9i1 eng https://jurnal.upnyk.ac.id/index.php/eksergi/article/view/6-10/pdf Copyright (c) 2022 Harso Pawignyo, Siswanti Siswanti

oai:jurnal.upnyk.ac.id:article/7578 2022-08-15T04:33:16Z eksergi:ART driver

Pembuatan Genteng dari Lumpur Lapindo dan Lempung Pundong dengan Variasi Komposisi Subagyo, Purwo Nuri, Wasir Pembuatan Genteng dari Lumpur Lapindo dan Lempung Pundong dengan Variasi Komposisi Prodi Teknik Kimia UPN "Veteran" Yogyakarta 2022-08-11 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article application/pdf https://jurnal.upnyk.ac.id/index.php/eksergi/article/view/11-15 10.31315/e.v9i1.7578 Eksergi; Vol. 9 No. 1 (2009): Versi Cetak Eksergi; Vol 9 No 1 (2009): Versi Cetak 2460-8203 1410-394X 10.31315/e.v9i1 eng https://jurnal.upnyk.ac.id/index.php/eksergi/article/view/11-15/pdf Copyright (c) 2022 Purwo Subagyo, Wasir Nuri 2e62837cfc078afe2420f7fddf5ee871