MBR工艺在西安经开草滩污水处理厂中的应用

Application of MBR in Caotan Wastewater Treatment Plant in Xi’an Economic Development District

西安经开草滩污水处理厂设计规模为20×10^4m^3/d,设计出水水质为《城镇污水处理厂污染物排放标准》(GB 18918-2002)中的一级A标准,出水一部分排放至渭河,另一部分进入回用管网。因本项目规划用地仅10 hm^2左右,且出水标准要求高,因此最终确定采用MBR工艺,工艺流程为预处理+A^2O+MBR+接触消毒。吨水占地约0.399 m^2/m^3,平均吨水能耗约0.37k W·h/m^3。污水厂实际运行结果表明,出水水质优于设计标准,且MBR工艺与AVS精确曝气技术的结合切实解决了用地紧张、出水水质要求高、耐高负荷水质水量冲击等问题,降低了MBR工艺运行成本。

The design treatment capacity of Caotan wastewater treatment plant in Xi’an economic development district was 20×10^4 m^3/d.The effluent quality was required to meet the first class level A standard of Discharge Standard of Pollutants for Municipal Wastewater Treatment Plant(GB 18918-2002).One part of the effluent was discharged into Weihe River,the other part was put into the reused network.The planned land for this project was only about 10 hm^2,while the reused water and effluent standards were relatively high.Therefore,MBR process was finally adopted as the main treatment unit.The treatment process was pretreatment unit+A^2O+MBR+contact disinfection tank.The land coverage for every ton of water treated was about 0.399 m^2/m^3,and the average power consumption was about0.37 k W·h/m^3.The operation practice showed that the effluent quality was superior to the design standard.The effective combination of MBR process and AVS precise aeration technology solved the problems of land shortage,high effluent quality standard,resistance to the impact of high load raw water quality and quantity,and reduction of the overall operation cost of MBR process.