Comparison of A~2/O and Membrane Bioreactor Processes for Municipal Wastewater Treatment: Nutrient Removal Performance and Sludge Characteristics

摘要

The performance of nitrogen and phosphorus removal was investigated in pilot-scale A~2/O, A~2/O-MBR and mA~2/O-MBR processes for treating municipal wastewater. The results show that these processes had a similar COD and ammonia removal efficiency, but A~2/O process had better denitrification efficiency than MBR processes. In order to explain the difference of nitrogen and phosphorus removal performance in the investigated processes, specific oxygen uptake rate (SOUR), specific denitrification rate (SDNR), anaerobic release rate and anoxic and aerobic uptake rate of the activated sludge taken from A~2/O and mA /O-MBR processes were compared. The results show that the activated sludge of mA~2/O-MBR process had a higher nitrifying activity in aerobic tank than A~2/O process, the denitrifying activity in anoxic tanks were roughly equal and A~2/O process had a higher denitrifying phosphorus removal activity in anoxic tank than mA~2/O-MBR process.