改良A^2/O工艺生物脱氮除磷应用研究

Application Research of Modified A^2/O Process for Biological Nitrogen and Phosphorus Removal

考察了改良A2/O工艺在西朗污水处理厂(一期)的应用情况。对该厂进行了一年的跟踪监测,结果表明,进水BOD5、COD、NH3-N、TN、TP、SS的平均浓度分别为99.5、167、19.4、26.9、2.79、119 mg/L,经改良A2/O工艺处理后,对BOD5、COD、NH3-N、TN、TP的平均去除率分别达到了93.5%、84.7%、96.9%、61.5%、78.9%,出水BOD5、COD、NH3-N、TN、TP的平均浓度分别为6.5、25.6、0.61、10.4、0.59 mg/L,出水水质达到了《城镇污水处理厂污染物排放标准》(GB18918—2002)的一级B标准,取得了良好的脱氮除磷效果。工程实践结果说明,改良A2/O工艺出水水质好、运行费用低,适用于城市污水处理厂脱氮除磷。

The application of the modified A2/O process in Xilang Wastewater Treatment Plant was investigated. The monitoring results for one year show that the average influent concentrations of BOD5 , COD, ammonia nitrogen, total nitrogen, total phosphorus and SS are 99.5, 167, 19.4, 26.9, 2.79 and 119 mg/L. After the treatment of modified A2/O process, the average effluent concentrations of BODs, COD, ammonia nitrogen, total nitrogen and total phosphorus are 6.5, 25.6, 0.61, 10.4 and 0.59 mg/L, and the average removal rates are 93.5 %, 84.7 %, 96.9% , 61.5% and 78.9% , respectively. The effluent quality meets the first level B criteria specified in the Discharge Standard of Pollutants for Munici- pal Wastewater Treatment Plant （GB 18918 -2002）. The operation result shows that the modified A2/O process has good effluent quality and low operation cost, and can be widely used in wastewater treatment plants.