Biodegradation Characteristics and Kinetics of Triclosan by Activated Sludge
The biodegradation characteristics and kinetics of tdclosan (TCS) by activated sludge were studied under aerobic,anoxic and anaerobic conditions.The degradation experiment was conducted in incubation shaker with synthetic wastewater.The mixed liquor suspended solids (MLSS) of activated sludge was 2 200 mg/L.The activated sludge (200 mL)was added into Erlenmeyer flask,and then placed into incubation shaker,with speed 125 r/min and temperature (20±0.5) ℃.The initial concentration of TCS was 50,100,200 μg/L,respectively.The results shows that TCS was adsorbed quickly by activated sludge at the beginning of the reaction.The concentration of TCS in aqueous phase decreased rapidly,while the concentration of TCS in sludge phase increased rapidly.TCS was biodegraded effectively by activated sludge under aerobic conditions.After 7-days' reaction,the biodegradation rate of TCS was reached above 50％.The aerobic degradation was accorded with pseudo first-order kinetics,with pseudo first-order reaction constant for TCS as 0.085 6 d-1 and the average half-life as 8.095 d under aerobic conditions.The biodegmdation of TCS by activated sludge under aerobic conditions was better than under anoxic and anaerobic conditions.There was small amount biodegradation under anoxic conditions,which was approximate 20％.TCS could not be biodegraded effectively by activated sludge under anaerobic condition.
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维普
