PROSES PENGOLAHAN LIMBAH CAIR DOMESTIK SECARA ANAEROB

Abstract

The pollution occurred to rivers in many towns is considered as the impact of domestic sewage disposal. Domestic sewage contains organic matters that it can be used as products instead of treated substances. The sewage can be treated biologically by using anaerobic activated sludge system. This research purposes on determining the type of activated sludge, treatment time needed, and biogas generated from anaerobic digestion. The domestic sewage was taken from the sewer in Wonodri Street, Semarang. Activated sludge from the sewer and tofu production sewage were used as the source of microorganisms. COD analysis was used as a parameter of sewage treatment. The results of this research are the decrease of COD value during 30 days is 37,3% and the biogas generated is 2,25 L. The best result of sewage treatment by using tofu activated sludge is obtained when 10 L of sewage is treated. The decrease of COD value is influenced by retention time, the volume of sewage treated, and the type of activated sludge. The time needed in order to treat the sewage to meet the water standard is 84 days.