SBBR同步硝化反硝化处理生活污水的影响因素

序批式生物膜反应器SBBR采用塑料鲍尔环填料,在有氧情况下用于处理实际生活污水.该反应器能很好地创造缺氧微环境,载体生物膜具有吸附储碳能力,出现了良好的同步硝化和反硝化现象.反应器中溶解氧浓度在较大的范围内(0.8～4.0 mg·L-1)能有效地实现同步硝化和反硝化.当溶解氧浓度大于4.0 mg·L-1后,TN容积去除率大幅下降,出水TN大幅上升.增加载体生物膜厚度有利于同步硝化和反硝化.进水浓度基本不影响脱氮的效率,但出水TN随进水浓度增加而升高,建议原水浓度高时可增加后续脱氮处理或减少进水量来满足出水要求.优化运行方法和参数后,SBBR连续运行的TN去除率可稳定在74%～82%.

Factors affecting simultaneous nitrification and denitrification in a SBBR treating domestic wastewater

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.