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Grey domestic wastewater from septic tank contains high nitrogen content especially ammonium and low C/N ratio. Therefore, the aerobic biological treatment is often not effective for ammonium and nitrogen removal. The aim of this work was to study the performance of ammonium removal and production of aerobic granular sludge using biochar produced from coffee husk pyrolyzed at 350 o C as biocarrier. It was performed under the lab-scale SBR systems. Low C/N ratio domestic wastewater was used for this work. Coffee husk biochar (CFH 350) was added into the systems at different dosage. As a result, the biochar made from coffee husk pyrolyzed at low temperature promoted the adhesion of microbial sludge onto biochar surface. The particles size of biochar played an important role for adhesion of microbial sludge on biochar. The growth rate of bacterial sludge was accelerated and higher than control sample when biochar was used with biochar dose of 15 g/L. Though nitrification rate was improved as the microbial sludge was accelerated, however, at initial stage, the removal efficiency of COD and ammonium was not as high as compared to traditional activated aerobic sludge system.

A STUDY ON COMBINATION OF BIOCHAR AND ACTIVATED SLUDGE FOR REMOVING AMMONIUM FROM LOW C/N RATIO WASTEWATER