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.
Application of High?efficiency Sedimentation Tank for Combined Sewer Overflows Pollution Control
China Water & Wastewater[ISSN:1000-4062/CN:12-1073/TU]
volume:
第40卷
Number:
第12期
Page:
68-72
Column:
Date of publication:
2024-06-17
- Keywords:
- combined sewer overflows (CSOs) pollution; high?efficiency sedimentation tank; sludge reflux
- 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.
Last Update:
2024-06-17