污水处理厂扩建工程设计及运行实例

北方某城市污水处理厂设计总规模18.0×104 m3/d，其中扩建工程设计规模8.0×104 m3/d，出水执行《城镇污水处理厂污染物排放标准》（GB 18918—2002）一级A标准。根据进水水质和排放要求，设计采用“初沉池-多级AO生化池-高速气浮池-反硝化深床滤池”工艺。介绍了扩建工程的工艺流程、主要构筑物设计参数、设计特点，并对运行效果进行分析。实际运行数据表明，出水各项指标均能稳定达标，COD、SS、NH3-N、TN、TP平均去除率分别达到88.90%、96.24%、97.31%、78.00%、92.87%。

Design and Operation of Wastewater Treatment Plant Expansion Project

The total design capacity of WWTP in a northern city is 18.0×104 m3/d, in which the design capacity of expansion project is 8.0×104 m3/d, and the effluent quality standard of WWTP is the first class A standard specified in Discharge Standard of Pollutants for Municipal Wastewater Treatment Plant (GB 18918—2002). According to the influent quality and discharge requirements, the process of "primary settling tank - multi-stage AO biochemical tank - high-speed air flotation tank - denitrification deep bed filter" is adopted in the design. The technological process of the expansion project, the design parameters of the main structures and the design characteristics are introduced, and the operation effects are analyzed. The actual operation data show that various indexes of the effluent can be all stable up to the standard. The average removal rates of COD, SS, NH3-N, TN and TP are 88.90%, 96.24%, 97.31%, 78.00% and 92.87% respectively.