Abstract: 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, and the mechanism of removal of modified multi-stage A/O-MBR combined process sludge denitrifying phosphorus was studied by static analysis of sludge mechanism. The results showed that the improved multi-stage A/O-MBR combination process has good TP removal efficiency, and the average removal rate is 86.36%. At the same time, the COD, TN，and nitrogen removal effects are good, and all reach 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.

Key words: multi-level a/o-mbr, domestic sewage, low c/n ratio, denitrifying phosphorus removal

摘要： 采用多级A/O-MBR组合工艺对低C/N比生活污水进行处理时，存在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COD、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。

关键词: 多级A/O-MBR , 生活污水 , 低C/N比 , 反硝化除磷