污水处理厂改良型氧化沟的提标改造

Upgrading and reconstruction of modified oxidation ditch in sewage treatment plant

某污水处理厂将改良型氧化沟改造为A^(2)/O池(MBR生物池),通过增设MBR膜池-厌氧区-缺氧区-好氧区间的逐级回流,将部分好氧区改造为缺氧区等使生物池的污泥浓度,COD、BOD5、氨氮、总氮的去除率明显提高。运行结果表明:改造后各项出水指标达到排放标准要求。

In a sewage treatment plant, the modified oxidation ditch was transformed into A^(2)/O ditch(MBR biological ditch). By adding stepwise reflux of MBR membrane ditch, anaerobic ditch, anoxic ditch and aerobic ditch, transforming part of aerobic ditch into anoxic ditch, MLSS of biological ditch was increased, and the removal rate of COD, BOD5, ammonia nitrogen and total nitrogen was significantly improved. The operation results show that all indexes of effluent meet the requirements of discharge standard.