FENGShi-xun,ZHANGWan-li,CHENGMing-tao,et al.Design of a Wastewater Treatment Plant Upgrading and Reconstruction Process in the First-grade Protection Zone of Taihu Lake Basin[J].China Water & Wastewater,2022,38(6):76-80.
太湖流域一级保护区内某污水厂提标改造工艺设计
- Title:
- Design of a Wastewater Treatment Plant Upgrading and Reconstruction Process in the First-grade Protection Zone of Taihu Lake Basin
- Keywords:
- Taihu Lake basin; upgrading and reconstruction; denitrification biofilter; high speed flotation tank
- 摘要:
- 对太湖流域一级保护区内某污水处理厂按照《太湖地区城镇污水处理厂及重点工业行业主要水污染物排放限值》（DB 32/1072—2018）标准提标改造，设计规模5.0×104 m3/d。针对出水标准高、现状主体构筑物去除能力有限、现状厂区没有有效的深度处理设施等工程问题，保留原一期CAST工艺、二期A2/O工艺，新建反硝化生物滤池、高速气浮池深度处理设施，并采取强化源头控制、提高污泥浓度、增加泥龄、控制溶解氧、优化碳源投加位置等非工程性管控措施。提标后工艺流程为粗格栅及进水泵房+细格栅及旋流沉砂池+CAST池（一期）/组合式A2/O池（二期）+反硝化生物滤池+高速气浮池+接触消毒池，出水水质稳定达到设计标准。工程总投资9 550.46 万元，增加总处理费用0.98 元/m3。
- Abstract:
- A wastewater treatment plant with a designed scale of 5.0×104 m3/d in the first?grade protection zone of Taihu Lake basin was upgraded according to the discharge limitation specified in Discharge Standard of Main Water Pollutants for Municipal Wastewater Treatment Plant & Key Industries of Taihu Area (DB 32/1072-2018). There are several engineering problems such as high effluent standard, limited removal capacity of current main structures, and no effective advanced treatment facilities in the current plant. To overcome these problems, the original CAST process in phase Ⅰ project and A2/O process in phase Ⅱ project were retained, a new denitrification biofilter and a high speed flotation tank as the advanced treatment facilities were constructed, and non-project measures, such as strengthening source control, increasing sludge concentration and sludge age, controlling dissolved oxygen and optimizing carbon source dosage point were adopted. After the transformation, the new process consists of coarse grid and inlet pump house, fine grid and cyclone settling tank, CAST tank (phase Ⅰ)/combined A2/O tank (phase Ⅱ), denitrification biofilter, high speed flotation tank and contact disinfection tank, and the effluent quality reaches the design standard stably. The total investment of the project is 95.504 6 million yuan, and the total treatment cost is increased by 0.98 yuan/m3.
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