水泵强制排水系统合流制溢流的污染源解析

Pollutant Source Apportionment of Combined Sewer Overflows for a Pump Lifting Drainage System

摘要:

在对上海市某截流式合流制系统服务范围内的地表径流、生活污水、雨天截流、溢流的水质与水量进行同步监测的基础上，根据排水管网水力模型确定系统储存的生活污水量，采用输入输出质量平衡法初步分析了该系统雨天总出流（溢流加截流）与溢流过程的SS，NH4+N来源，结合降雨特性比较分析了雨天总出流、溢流的污染源解析结果的差异，与雨天总出流的污染负荷构成相比，2012年6场降雨溢流事件的溢流SS， NH4+N负荷中，地表径流的贡献率分别下降了10.2%～25.1%，4.5%～11.0%，生活污水贡献率分别降低了0.3%～1.5%，6.0%～30.7%，管道沉积物贡献率则分别增长了11.2%～25.4%，6.8%～37.2%.研究成果直接确定了对水体造成危害的溢流污染的来源，为合流制溢流污染控制、城市水环境保护策略的制定提供了依据.

Abstract:

Origins of pollution loads of SS，NH4+ N from total wet weather flows and the overflows from a pump lifting combined sewer system in Shanghai were analyzed with the method of the entry exit mass balance, respectively, based on simultaneously quantity and quality monitoring of surface runoff, sanitary sewage, intercepted wet weather flow and sewer overflow. Compared with the origins of SS , NH4+ N in wet weather flow from 6 monitored rainfall/overflow events, the origins of the two pollutants in CSO were different: the surface runoff contribution decreased by 10.2%～25.1% and 4.5%～11.0%, respectively; the sanitary sewage contribution decreased by 0.3%～1.5% and 6.0%～30.7%, respectively; while the sewer deposits contribution increased by 11.2%～25.4% and 6.8%～37.2%, respectively. Reasons of the difference were analyzed. The results provide a better method to apportion wet weather pollution suffered by urban receiving water, and help to make reasonable decisions to control CSO pollution.