Efisiensi Penurunan Kadar Logam Cu pada Limbah Cair Industri Elektroplating dengan Proses Elektrokoagulasi

Abstract

Liquid waste in the electroplating industry contains heavy metals such as nickel, copper and zinc. If the waste is discharged directly to the environment without any prior treatment it will cause damage to humans and the environment. One method that can be used to treat this wastewater is electrocoagulation. Where electrocoagulation is an electrolysis process that requires electric power, electrical conductors and electrodes. The purpose of this research is to determine the efficiency of reducing the concentration of Cu in the variation voltage and stirring speed on the electrocoagulation processes. First and second order reaction rate constant have been evaluated. Eighty mL of electroplating waste is added to reactor, stirred  using magnetic stirer in the variation of voltage (12,14,16 V) and in the variation speed (200, 300, 400) rpm. Every 40 minutes samples were analyzed using AAS. Electrocoagulation processes were stopped in 160 minutes. The results showed the highest efficiency in the variation of voltage and string speed are 95.92% and 96.81 % in that order. First order reaction rate constant in the variation stirring speed and voltage are 0,0163 s^-1 and 1,8937 s^-1 respectively. On the other hand  second order reaction rate constant in the variation stirring speed and voltage are 0,0269 s^-1  dan 3,9322 s^-1 respectively.