XUE Feng,ZHANG Wan-li,JING Shuai,et al.Design of an Expansion Project Upgraded to Quasi Class Ⅳ Discharge Standard of a Multi?phase Wastewater Treatment Plant in Taihu Lake Basin[J].China Water & Wastewater,2023,39(20):64-71.
太湖流域多期建设污水厂准Ⅳ类提标扩容工程设计
- Title:
- Design of an Expansion Project Upgraded to Quasi Class Ⅳ Discharge Standard of a Multi?phase Wastewater Treatment Plant in Taihu Lake Basin
- 关键词:
- 太湖流域; 提标扩容; 改良型Bardenpho; 高速气浮池; 生态缓冲区
- Keywords:
- Taihu Lake basin; upgrading and expansion; modified Bardenpho; high speed air flotation tank; ecological buffer zone
- 摘要:
- 太湖流域某城镇污水处理厂设计规模为10×104 m3/d，分为四期建设，主体采用CAST及AAO工艺。提标扩容工程以现状四期工程构筑物提标潜力分析为基础、以混合出水达标排放为目标，从利旧运行状态好的处理设施、优化二期三期生化单元、改造部分闲置构筑物、拆除一期利浦罐腾挪空间、新建深度处理设施、调配衔接各期工程等各维度展开提标扩容设计。预处理采用“粗格栅及提升泵房/细格栅、精细格栅及曝气沉砂池/初沉池”工艺，二级处理工艺采用“改良型Bardenpho生化沉淀池（新一期）、改良AAO及二沉池（二期及四期）、AAO工艺及二沉池（三期）”，深度处理采用“反硝化滤池/高速气浮池/臭氧接触池（新一期及二期）、反硝化滤池/接触消毒池（三期及四期）”工艺，出水混合后部分进入生态缓冲区对尾水进一步处理后再外排进河道。项目完成后规模达12×104 m3/d，运行状态良好，出水水质达到地表水准Ⅳ类标准。
- Abstract:
- The design scale of a municipal wastewater treatment plant in Taihu Lake basin is 10×104 m3/d. The key processes of the plant are CAST and AAO, and the construction is divided into four phases. The upgrading and expansion project is based on the potential analysis of the current structures belonged to the phase Ⅰ-Ⅳ projects and the goal of ensuring the mixed effluent quality meeting the discharge standards. The updrading and expansion design is carried out by considering the aspects such as utilizing well operating treatment facilities, optimizing the biochemical units of phase Ⅱ and phase Ⅲ projects, renovating some idle structures, demolishing the Lipu tanks belonged to phase Ⅰ project to release the space, constructing new advanced treatment facilities, coordinating and connecting different phase projects and so on. The pretreatment processes include coarse grid/pumping house/fine grid and finer grid/aerated grit chamber/primary sedimentation tank. The secondary treatment processes consist of modified Bardenpho biochemical sedimentation tank (new phase Ⅰ project), modified AAO and secondary sedimentation tank (phase Ⅱ and Ⅳ projects), and AAO process and secondary sedimentation tank (phase Ⅲ project). The advanced treatment processes are denitrification filter/high speed air floating tank/ozone contact tank (new phase Ⅰ and phase Ⅱ projects), and denitrification filter/contact disinfection tank (phase Ⅲ and Ⅳ projects). After mixing, part of the effluent enters the ecological buffer zone for further treatment before being discharged into the river. After the completion of the project, the scale reaches 12×104 m3/d. The wastewater treatment plant operates well and the effluent quality meets the surface water quasi class Ⅳ standard.
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