Characteristics of Combined Sewer Overflows in Nanjing and Selection of Intercepted Time

Abstract:

The purpose of this study is to investigate the characteristic of pollutants overflow on storm events, relationships between pollutant load and rainfall duration, and rainfall intensity in Chaotian Palace, Nanjing City. The results showed that high pollutant concentrations were observed in the initial stage of runoff and decreased continuously over rainfall duration. Moreover, the wash off ratios of pollutants load decreased with rainfall intensity declining. Furthermore, initial 5, 10, 20, 30, 40 min intervals of a rainfall event were chosen to investigate the variation of pollutants load decrement rate of CSOs. An obvious corner at initial 10 min was observed for all parameters in whole storm events. The slope of curves before 10 min is steeper than after that one. Based on the analysis on pollutants load decrement rate of CSOs, 10 min could be chosen as control point in intercepted engineering for optimizing treatment facilities in order to achieve cost-effective CSOs control.

• Periodical: Advanced Materials Research (Volumes 594-597)
• Pages: 2056-2060
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.594-597.2056
• Online since: November 2012
• Authors: Qian Feng, Chun Yan Wu
• Keywords: Combined Sewer Overflows (CSOs), Intercepted Time, Pollutant Load, Rainfall Duration, Rainfall Intensity

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