GAOYu-hong,SUNWei,RUANPeng-cheng,et al.Application of High?efficiency Sedimentation Tank for Combined Sewer Overflows Pollution Control[J].China Water & Wastewater,2024,40(12):68-72.
高效沉淀池在合流制溢流污染控制中的工程应用
- Title:
- Application of High?efficiency Sedimentation Tank for Combined Sewer Overflows Pollution Control
- 关键词:
- 合流制溢流（CSOs）污染; 高效沉淀池; 污泥回流
- Keywords:
- combined sewer overflows (CSOs) pollution; high?efficiency sedimentation tank; sludge reflux
- 摘要:
- 为控制城市建成区雨天合流制溢流（CSOs）污染对河道水环境的冲击，黄孝河水环境综合治理项目采用25×104 m3的调蓄池和设计处理峰值水量6 m3/s的强化处理设施（即污泥回流型高效沉淀池工艺）对明渠上游暗涵雨天CSOs污水进行储存及处理。高效沉淀池设计出水水质为SS≤20 mg/L、TP≤1 mg/L、COD≤100 mg/L，结合精密过滤池，可将SS进一步降低至10 mg/L。通过对高效沉淀池的工艺以及启动方式的优化设计，可使空池启动时间降低至12 min，同时采用污水内循环系统可减少启动过程产生的不达标出水10 800 m3。按照最大进水污染负荷测算，工程运行费用为0.29元/m3。
- Abstract:
- The process consisting of a storage tank with volume of 25×104 m3 and an intensified treatment facility with the deigned peak flow of 6 m3/s (exactly a high-efficiency sedimentation tank with sludge reflux function) belonged to the Huangxiao River water environment comprehensive treatment project was employed to store and treat the combined sewer overflows (CSOs) from the upstream buried culvert of the open channel in rainy days, so as to control the impact of CSOs pollution on river water environment in urban built-up area. The design effluent quality of high-efficiency sedimentation tank was as follows: SS≤20 mg/L, TP≤1 mg/L and COD≤100 mg/L. The SS could be further reduced to 10 mg/L after treated by the precision filter tank. The optimization design of the process and the start-up mode of the high- efficiency sedimentation tank reduced the start-up time of the empty tank to 12 min. In addition, the sewage internal circulation system reduced the unqualified effluent by 10 800 m3 during the start-up period. According to the maximum influent pollution load, the project operational cost was 0.29 yuan/m3.
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