Factors affecting simultaneous nitrification and denitrification in a SBBR treating domestic wastewater
SBBR同步硝化反硝化处理生活污水的影响因素

An aerobic sequencing batch biofilm reactor (SBBR) packed with Baoer rings was used to treat real domestic wastewater. The aim was to achieve simultaneous nitrification and denitrification. The SBBR is advantageous to create anoxic condition, and biofilm can absorb and store carbon for good nitrification and denitrification. A concentration of average oxygen range from 0.8 to 4.0 mg?L-1 was proved very efficient for nitrification and denitrification. Volumetric loads of TN were dropped dramatically and effluent TN concentration increased quickly when the concentration of average oxygen was more than 4.0 mg?L-1. The efficiency of simultaneous nitrification and denitrification increased with increasing of thickness of the biofilm. The influent concentration hardly affected the TN removal efficiency, but the effluent TN increased with increasing of influent concentration. It is suggested that a subsequence for denitrification is added or influent amount is decreased for requirement of effluent quality. At optimum operating parameters, the TN removal efficiency of 74%~82% could be achieved.