Watershed Management and Control Strategies for Urban Combined Sewer Overflows during Peak Wet Weather Flow Conditions
China Water & Wastewater[ISSN:1000-4062/CN:12-1073/TU]
volume:
第36卷
Number:
8 8
Page:
20-29
Column:
Date of publication:
2020-04-17
- Abstract:
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While the traditional urban sanitary sewers system collects wastewater and improves the water environment, it also reveals the hydraulic capacity shortage of the WWTPs and their insufficiency in handling peak wet weather flow problems caused by rapid increase of inflow due to high intensity stormwater collected from the catchment area and the rapid transfer of stormwater to the WWTPs in the centralized urban drainage system. However, the current wastewater treatment design and operation in our country, for example activated sludge design, does not address peak wet weather flow condition. This causes sanitary sewer collection system overflow and bypass before wastewater reaches wastewater treatment plants and internal bypass of wastewater design processes within the WWTP. The overflow and bypass have significantly polluted our rivers, receiving streams, and surface waters. Evaluating the systematic capacity shortage of the centralized urban collection systems in dealing with peak wet weather flow and analyzing the characteristics of the peak wet weather flow pattern in our country, this paper studied the main technical framework, solutions and operational control model of dealing with peak wet weather flows in the developed countries in Europe and North America. This paper has thus provided recommendations to policy making and legislation as well as development of effluent discharge standards for peak wet weather flow treatment, serving as a next phase in watershed management in China.
Last Update:
2020-04-17