ZHUXiao-chao,FENGYa-bing,TAOHui,et al.Design of CAST Enhanced Denitrification and Phosphorus Removal Upgrading and Reconstruction Project in a Wastewater Treatment Plant[J].China Water & Wastewater,2023,39(2):58-62.
某污水厂CAST工艺强化脱氮除磷升级改造工程设计
- Title:
- Design of CAST Enhanced Denitrification and Phosphorus Removal Upgrading and Reconstruction Project in a Wastewater Treatment Plant
- 摘要:
- 江苏某市政污水处理厂设计规模为2.5×104 m3/d，采用CAST主体工艺，出水水质执行一级B排放标准，为使出水水质提升至一级A标准，升级改造工程改造了原CAST工艺并增加了微絮凝过滤深度处理工艺。在CAST池生物选择区内安装曝气器，改为主反应区使用，同时解决了积泥的问题；主反应区内安装搅拌器、运行周期上设置缺氧搅拌时段，可提高系统脱氮效果；将剩余污泥泵单点排泥改为穿孔排泥管排泥，提升排泥效率；将旋流曝气器改为微孔曝气器，提高氧利用效率；在CAST池投加PAC同步化学除磷。工程完成后已运行1年多，出水水质稳定达到一级A标准。
- Abstract:
- The design scale of a municipal wastewater treatment plant in Jiangsu is 2.5×104 m3/d. The main process was CAST, and the effluent quality was required to meet first level B discharge standard. To improve the effluent quality to the first level A discharge standard, the original CAST process was modified and the micro-flocculation filtration advanced treatment process was added in the upgrading and reconstruction project. Aerators were installed in the biological selection zone of CAST tank, which were changed to the main reaction zone instead, and thus the problem of sludge accumulation was solved. The nitrogen removal performance of the system was improved by installing agitators in the main reaction zone and setting anoxic agitation period in the operation cycle. The single point sludge discharge of the excess sludge pump was replaced by the perforated sludge discharge pipe to improve the sludge discharge efficiency. The cyclone aerator was changed to microporous aerator to improve the efficiency of oxygen utilization. PAC was added to CAST tank for simultaneous chemical phosphorus removal. The project has been in operation for more than one year after completion, and the effluent quality has stably reached first level A discharge standard.
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