合流制排水系统雨天溢流污染CMB法源解析

Pollutant Source Apportionment of Combined Sewer Overflows Using Chemical Mass Balance Method

对上海市某合流制排水系统服务范围内的地表径流、旱流污水和管道沉积物的污染物特性进行检测分析,通过对比不同污染源的污染特征,确定Zn、NH+4-N、P的含量分别在地表径流、旱流污水和管道沉积物中具有特异性且相对稳定,提出以Zn/P、NH+4-N/Zn、P/K这3个无量纲比值作为上述3个排放源各自的特征参数,据此探讨了CMB法在合流制雨天溢流污染源解析中的应用,结果表明,地表径流、旱流污水和管道沉积物对溢流污染的平均贡献率分别为42.8%、12.2%、23.8%,解析结果可基本反映CSO污染的构成情况.研究方法与结果为合流制系统雨天溢流污染源解析提供了参考.

Pollutant characteristics of surface runoff, sanitary sewage and sewer deposits from a combined sewer system in Shanghai were studied. It was confirmed that the content of Zn, NH4 ＋-N, P, respectively in surface runoff, sanitary sewage and sewer deposits was specific and relatively stable based on contrasting pollutant characteristics of different sources. Three non-dimensional parameters- Zn/P, NH4 -N/Zn, P/K were proposed as characteristic index for surface runoff, sanitary sewage and sewer deposits. In order to find sources of pollutants in CSO, the application of chemical mass balance method was discussed： the average contributions to CSO were 42.8% for surface runoff, 12.2% for sanitary sewage, 23.8% for sewer deposits, and the results basically reflected the composition of CSO pollution. The research method and results can provide guidance for pollutant source apportionment of combined sewer overflows.