Production of Biogas from Water Hyacinth with Addition of Cow Dung as Inoculum Using a Plug Flow Anaerobic Reactor

Soeprijanto Soeprijanto, Rakhmat Asrie Wibowo N, Dinal Izzati, Wulan Maghfiro, Risqy Rohmawati


Biogas as an alternative energy source has several advantages over fossil fuels. Water hyacinth is a type of weed that has the potential to produce biogas. The purpose of this study was to determine the effect of pre-treatment on water hyacinth with the addition of 0.5 N NaOH and without NaOH and determine the effect of ratio of water hyacinth and water at 1: 2 and 1: 3 to the biogas production in a Plug flow reactor. Water hyacinth was crushed and then pre-treated by heating it in 0.5 N NaOH solution at 100oC. Biogas output from the reactor was accommodated in tubular plastic, and the volume of biogas was measured by water displacement using a volumetric glassware. The results showed that the average production of biogas at ratio of 1: 2 and 1: 3 was 9,983 ml and 7,172 ml, with  a composition of CH4 (45.024%), CO2 (11.50%), H2S (0.86%), NH3 (0,3%) and CH4 (35.25%), CO2 (12.41%), H2S (0.96%), NH3 (0.34%), respectively. The average production of biogas in the pre-treatment by heating materials 100oC without NaOH and heating 100oC with NaOH 0.5 N was 11,853 ml and 9,110 ml with biogas composition produced was CH4 (50.19%), CO2 (12.36%), H2S (0.64%), NH3 (0.33%) and CH4 (54.13%), CO2 (12.36%), H2S (0.91%), NH3(0.43%), respectively. It concluded that the addition of NaOH for thermal treatment was able to increase the production of biogas and the methane content in the biogas produced


biogas; cow dung; energy; fermentation; water hyacinth.


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