The Reduction of COD Levels in Domestic Waste Water Using Combination of Activated Sludge Methode – Activated Carbon Continously

Domestic waste water produced from Pujasera Politeknik Negeri Bandung has a relatively high organic compound. It can cause environmental pollution, so waste water treatment is required to reduce the concentration of organic compounds. The purpose of this study is to determine the efficiency of processing organic compounds in domestic wastewater using active sludge in combination with Activated carbon. The acclimation process is carried out in batches, while the waste water feed is continuously fed by varying the retention time and activated carbon concentration. Variation of retention time of 12, 18, 24 hours and variation of activated carbon concentration 50, 100, 150 ppm. The parameters used in aerobic wastewater treatment are COD, pH, and MLSS measurements. Based on the results of data analysis showed that the percentage decrease of COD from 861 mg / L to 160 mg / L with a pH range of 6.5 to 7 and MLSS averaged 2951 mg / L. The optimum retention time 24 hours with efficiency of COD effluent reduction without activated carbon was 74.91%. With the same operating conditions, at 24 hours of retention time using a combination of activated sludge - activated carbon of 150 ppm, the efficiency of COD effluent reduction was 89.97%. (paper)