改良型多级A/O-MBR组合工艺对低C/N比生活污水的强化除磷

Improved multi-stage A/O-MBR combination process for removal of phosphorus of low C/N ratio domestic sewage

采用多级厌氧/耗氧膜生物反应器(A/O-MBR)组合工艺对低C/N比生活污水进行处理时,存在总磷(TP)处理不达标的问题。通过改变污泥回流位置并增加内回流的改良型多级A/O-MBR组合工艺强化除磷,探究该工艺对低C/N比生活污水中TP的去除效果,并通过污泥静态分析研究其污泥反硝化除磷机理。结果表明,改良型多级A/O-MBR组合工艺对TP去除效果良好,平均去除率达到了86.36%,同时对化学需氧量(COD)、总氮(TN)及氨氮去除效果良好,均达到一级A排放标准。该工艺提高了聚磷菌及反硝化聚磷菌的比例,有效强化了对TP的去除。

When the low-C/N ratio domestic sewage is treated by the multi-stage A/O-MBR combination process,there is a problem that the TP removal rate is low.The removal of the phosphorus is enhanced by the improved multi-stage A/O-MBR combination process of increasing internal reflux.The removal effect of modified multi-stage A/O-MBR combination process on TP in low C/N ratio domestic sewage was studied.The mechanism of removal of modified multi-stage A/O-MBR combined process sludge denitrifying phosphorus was investigated by static analysis of sludge.The results showed that the improved multi-stage A/O-MBR combination process had good TP removal efficiency with the average removal rate of 86.36%.At the same time,the effects of COD,TN and nitrogen removal were good,and all reached the first-class A emission standard.The proportion of polyphosphate bacteria and denitrifying phosphorus accumulating bacteria were increased by the improved multi-stage A/O-MBR combination process,and the removal effect of TP by the combined process was strengthened.