苏州市某城镇污水处理厂提标改造工程实例

Upgrading and Reconstruction of a Wastewater Treatment Plant in Suzhou

摘要:

苏州市某城镇污水处理厂设计处理规模为6.0万m³/d，现状采用“旋流沉砂+氧化沟+二沉池+絮凝过滤”的污水主体处理工艺，设计出水水质执行《城镇污水处理厂污染物排放标准》（GB 18918—2002）一级A标准。结合某污水处理厂提标改造工程，在现有污水处理设施的基础上，通过氧化沟改造，强化有机物去除和氨氮硝化能力，同时新建深度处理设施高效沉淀池和反硝化深床滤池，深度脱氮除磷。在该工程实施后，污水处理厂运行稳定，出水水质能够稳定达到准Ⅳ类水标准，即TN≤10 mg/L。

Abstract:

The design treatment scale of a municipal wastewater treatment plant （WWTP) in Suzhou is 60 000 m³/d. The main sewage treatment process is "rotational flow grit tank + oxidation ditch + secondary sedimentation tank + flocculation filtration". The design effluent quality is carried out according to the first class A standard in Discharge Standard of Pollutants for Municipal Wastewater Treatment Plant （GB 18918—2002). Taking the upgrading and reconstruction project of this WWTP as an example, on the basis of the existing sewage treatment facilities, the ability of organic matter removal and ammonia nitrification is strengthened through the reconstruction of oxidation ditch. At the same time, the advanced treatment facilities of high efficiency sedimentation tank and denitrification deep bed filter are newly built for the advanced removal of nitrogen and phosphorus. After the implementation of this project, the operation of WWTP is stable, and the effluent quality can stably reach the quasi-IV water standard （TN≤10 mg/L).