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针对某一城市污水处理厂＂混合型城市污水＂的特征,以厂区曝气沉砂池出水作为处理对象,设计一套A2/O工艺强化脱氮除磷中试装置。当进水COD、NH3-N、TN、TP的平均质量浓度分别为594,25.0,37.6,7.66 mg/L时,经A2/O工艺强化处理后,出水COD、NH3-N、TN、TP的平均质量浓度分别为46.7,5.5,12.73,0.7 mg/L,对COD、NH3-N、TN、TP的平均去除率分别达91.51%、79.73%、65.78%和88.65%,出水水质达GB 18918—2002《城镇污水处理厂污染物排放标准》一级标准,取得了良好的污染物去除和脱氮除磷效果,且当系统稳定运行时总体出水水质相对稳定。“,”For the“mixed city sewage” feature of a city sewage treatment plant,taking the effluent of aeration settling basin as the processing object,a set of A2/O process devices were designed for strengthening denitrification and dephosphorization.When the average influent concentrations of COD,NH3-N,TN and TP were 594,25.0,37.6,7.66 mg/L,after the strengthening treatment of A2/O process,the average effluent concentrations of COD,NH3-N,TN and TP were 46.7,5.5,12.73 and 0.7 mg/L,so the average removal rate of COD,NH3-N,TN and TP respectively reached 91.51%,79.73%,65.78% and 88.65%.The effluent could meet the first level criteria specified in “Discharge Standard of Pollutants for Municipal Wastewater Plant”(GB 18918—2002).The good effect for removing pollutants,nitrogen and phosphorus was got,and the effluent quanlity was relatively stable when the system operated stably.