关键词: 环境工程, 污水处理厂, 提标改造, A2/O工艺, 深度处理

Abstract: With the increasingly strict requirements of environmental protection, higher requirements for the effluent quality of urban sewage treatment plants were put forward. The originally designed effluent of Changtu sewage treatment plant was the first class B discharge standard of GB18918—2002 standard for pollutant discharge of urban sewage treatment plants, whose treatment process was single and process flow was not perfect. Moreover, the project was located in a cold area, resulting in unstable effluent quality, which needed to be urgently upgraded. Based on the current situation and main problems of the proposed project, the original biochemical process was upgraded from A/O process to A2/O process. In addition, the “coagulant sedimentation + fibber rotary plate filtration” advanced treatment unit and disinfection process were added. The research results show that after the transformation, the operation of the sewage treatment system is stable, the treatment effect is good, and the effluent quality can meet the first class A discharge standard of GB18918—2002 standard for pollutant discharge of urban sewage treatment plants. The proposed project practice can be used for reference to upgrade and transform wastewater treatment plant in cold area.

Key words: environmental engineering, sewage treatment plant, bid upgrading, A2/O process, advanced treatment