The influence of electrocoagulation to the reduction of COD, BOD, and TSS of Batik Industry wastewater

Despite of the positive effect of the growth of Batik industry in Yogyakarta to economy, the waste water pollution of dying process of Batik industry has negative impact to environment. Initial measurement of COD, BOD and TSS of waste water resulted from dying process of Batik that implemented Naphtolat and Diazo Salts were exceeded the threshold. Hence, this study implemented electrocoagulation for processing Batik wastewater. The results showed that the range of the electrodes and the voltage are give effect to the reduction in COD, BOD, and TSS in liquid sewage electrocoagulation process in dye wastewater in batik industry "Rara Djonggrang". The optimum electrode range on TSS and BOD reduction in the optimum is  a range of 2 cm with 85.71% of TSS decrease and 7.02% of BOD reduction, while the optimum COD reduction in a range of 4 cm with a decrease of 92.18%. The voltage give effect to decrease in TSS and COD are 15 V, with 85.71% of TSS decrease and 92.18% of COD reduction. The most optimum of BOD value is ​​using voltage variation 10 V and a range of 6 cm. Electrocoagulation process with using aluminum electrode is the most appropriate for treating Diazol Salt sewage.