MABR耦合A^(2)O工艺处理市政污水的效能

Performance of MABR Coupled A^(2)O Process for Municipal Wastewater Treatment

为研究膜曝气生物膜反应器(MABR)处理市政污水的实际应用效果,在南京市某市政污水处理厂内建设了400 m^(3)/d的MABR耦合A^(2)O(A^(2)O-MABR)工艺示范项目。示踪试验结果表明池体处于水力全混状态,能够匹配连续流搅拌反应器(CSTR)模型。在长期运行中,MABR的氧传递性能及硝化性能稳定,传氧速率(OTR)平均值为9.0 g/(m^(2)·d),硝化去除的氨氮占进水氨氮的28%,且在MABR单元内实现了同步硝化反硝化(SND)。MABR生物膜的生物富集作用强于活性污泥,MABR生物膜及活性污泥内具有丰富的微生物群落,包含各类污水处理系统中的典型菌种,且MABR生物膜内硝化菌相对丰度平均值达到12%。MABR系统平均能耗为0.11 kW·h/m^(3),仅占总体能耗的19%,在节能降碳方面极具潜力。

In order to study the performance of membrane aerated biofilm reactor(MABR)in municipal wastewater treatment,a full-scale demonstration plant(400 m^(3)/d)using MABR coupled A^(2)O(A^(2)O-MABR)process was established in a municipal wastewater treatment plant in Nanjing.The dye test results showed that the tanks were in completely mixed condition and the continuous stirred tank reactor model was applied.The oxygen transfer and nitrification performances of MABR were stable in long-term operation,with an average oxygen transfer rate(OTR)of 9.0 g/(m^(2)·d),and 28%of the influent ammonia nitrogen was removed by MABR.The simultaneous nitrification and denitrification was achieved in MABR tank.The microbe enrichment effect of MABR biofilm was stronger than that of activated sludge.The MABR biofilm and activated sludge had rich microbial communities,including typical species found in various wastewater treatment systems.The average relative abundance of Nitrospira in MABR biofilmreached 12%.The energy consumption of MABR system was 0.11 kW·h/m^(3),accounting for 19%of thetotal energy consumption,indicating its great potential for energy saving and carbon reduction.