Stormwater runoff pollution loads from an urban catchment with rainy climate in China

doi:10.1007/s11783-012-0447-2

Front Envir Sci Eng

2012, Vol. 6

Issue (5) : 672-677 https://doi.org/10.1007/s11783-012-0447-2

RESEARCH ARTICLE

Stormwater runoff pollution loads from an urban catchment with rainy climate in China

Liqing LI¹(

), Baoqing SHAN², Chenqing YIN²

1. School of Environmental Studies, China University of Geosciences, Wuhan 430074, China; 2. SKLAC, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China

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Abstract

An older urban district in Wuhan, China, is transitioning from discharging sewage and stormwater directly into lakes, to directing the sewage to wastewater treatment plants (WWTPs). Dealing with polluted stormwater discharge is a great challenge. Stormwater runoff from an urban catchment with a combined sewer system was sampled and analyzed over a three-year period. Results indicate that wet weather flows account for 66%, 31%, 17%, and 13% of the total load of suspended solids (SS), chemical oxygen demand (COD), total nitrogen, and total phosphorus, respectively. The first flush of COD and SS was significant in all runoff events. More than 50% of the SS and COD loads were transported by the first 30% of runoff volume. Storage and treatment of the first 10 mm from each combined sewer overflow event could reduce more than 70% of the annual COD overflow load. An integrated solution is recommended, consisting of a tank connected to the WWTP and a detention pond, to store and treat the combined sewer overflow (CSO). These results may be helpful in mitigating CSO pollution for many other urban areas in China and other developing countries.

Keywords combined sewer overflow pollution load first flush detention basins

Corresponding Author(s): LI Liqing,Email:li-liqing@163.com

Issue Date: 01 October 2012

Cite this article:

Liqing LI,Baoqing SHAN,Chenqing YIN. Stormwater runoff pollution loads from an urban catchment with rainy climate in China[J]. Front Envir Sci Eng, 2012, 6(5): 672-677.

URL:

https://academic.hep.com.cn/fese/EN/10.1007/s11783-012-0447-2
https://academic.hep.com.cn/fese/EN/Y2012/V6/I5/672

Fig.1 Urban catchment sampling station for sewage and CSO to lake

Tab.1 Rainfall parameters for monitored storm events from 2003 to 2005

Fig.2 CSO discharge characteristics from Shilipu urban catchment, caused by 35.0 mm storm event on June 10, 2005: (a) rain intensity; (b) flow rate, TSS, and COD; and (c) TN and TP

Tab.2 Event mean concentrations and wet weather flow loads of 12 monitored storm runoff events at Shilipu catchment

Fig.3 Normalized cumulative COD mass and runoff volume curves at Shilipu catchment

Fig.4 Cumulative COD mass in runoff process of nine storm events at Shilipu catchment

Fig.5 Average pollutant capture efficiency as function of storage volume for first flush treatment

Fig.6 Proposed solution — combination of tank and detention pond for wet weather flow control

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