青岛某全地下MBR污水处理厂的设计

Design of an Underground MBR Wastewater Treatment Plant in Qingdao

青岛某全地下污水处理厂设计规模为4×104m^3/d,厂区占地为1.31 hm^2,采用曝气除油沉砂池+精细格栅+生物池+MBR工艺。进水以生活污水为主,设计出水水质同时满足《城镇污水处理厂污染物排放标准》(GB 18918—2002)一级A标准、《城市污水再生利用景观环境用水水质》(GB/T 18921—2002)中的娱乐性景观环境用水标准、《青岛市环境保护局关于明确2015年省控河流断面水质改善目标的函》中相关要求。厂区用地面积较小且呈不规则状,为保证生物池水力停留时间满足处理要求,本次设计生物池有效水深为8.5 m。实际运行表明,出水水质完全达到了设计目标,其设计经验可供其他类似工程参考。

The design scale of an underground MBR wastewater treatment plant in Qingdao was4 × 104 m^3/d with the area coverage of 1.31 hm^2.The combination treatment process of aeration oil removal sedimentation tank + fine grille + biological treatment tank + MBR was adopted.Domestic sewage was the main part of influent.The design effluent quality was required to meet the relevant requirements of the first class A standard of Discharge Standard of Pollutants for Municipal Wastewater Treatment Plant( GB 18918-2002),the recreational landscape environment water standard in the Reuse of Urban Recycling Water—Water Quality Standard for Scenic Environment Use( GB/T 18921-2002),and the Letter of Qingdao Environmental Protection Bureau on Clarifying the Water Quality Improvement Target of Provincial River Section in 2015.The land of the plant was small and irregular.In order to ensure the sufficient hydraulic retention time of the biological tank for the treatment requirements,the effective depth of the biological tank in this design was 8.5 m.The actual operation showed that the effluent quality had completely reached the design goal.Its design experience could be used as a reference for other similar projects.