title: Characteristics of the overflow pollution of storm drains with inappropriate sewage entry.
abstract: To probe the overflow pollution of separate storm drains with inappropriate sewage entries, in terms of the relationship between sewage entries and the corresponding dry-weather and wet-weather overflow, the monitoring activities were conducted in a storm drainage system in the Shanghai downtown area (374 ha). In this study site, samples from inappropriately entered dry-weather sewage and the overflow due to storm pumps operation on dry-weather and wet-weather days were collected and then monitored for six water quality constituents. It was found that overflow concentrations of dry-weather period could be higher than those of wet-weather period; under wet-weather period, the overflow concentrations of storm drains were close to or even higher than that of combined sewers. Relatively strong first flush mostly occurred under heavy rain that satisfied critical rainfall amount, maximum rainfall intensity, and maximum pumping discharge, while almost no first flush effect or only weak first flush effect was found for the other rainfall events. Such phenomenon was attributed to lower in-line pipe storage as compared to that of the combined sewers, and serious sediment accumulation within the storm pipes due to sewage entry. For this kind of system, treating a continuous overflow rate is a better strategy than treating the maximum amount of early part of the overflow. Correcting the key inappropriate sewage entries into storm drains should also be focused.
authors.affiliation: State Key Laboratory of Pollution Control and Resource Reuse, Tongji University, Shanghai, 200092, China. yinhailong@tongji.edu.cn.|Key Laboratory of Yangtze River Water Environment, Ministry of Education, Tongji University, Shanghai, 200092, China. yinhailong@tongji.edu.cn.
authors.forename: Hailong
authors.initials: H
authors.lastname: Yin
authors.affiliation: Key Laboratory of Yangtze River Water Environment, Ministry of Education, Tongji University, Shanghai, 200092, China.
authors.forename: Yi
authors.initials: Y
authors.lastname: Lu
authors.affiliation: State Key Laboratory of Pollution Control and Resource Reuse, Tongji University, Shanghai, 200092, China. xzx@stcsm.gov.cn.
authors.forename: Zuxin
authors.initials: Z
authors.lastname: Xu
authors.affiliation: Key Laboratory of Yangtze River Water Environment, Ministry of Education, Tongji University, Shanghai, 200092, China.
authors.forename: Huaizheng
authors.initials: H
authors.lastname: Li
authors.affiliation: Civil and Environmental Engineering Department, Stanford University, 473 Via Ortega, Stanford, CA, 94305, USA.
authors.forename: Benedict R
authors.initials: BR
authors.lastname: Schwegler
mesh_terms: D002681:China; D004784:Environmental Monitoring; D011891:Rain; D012722:Sewage; D014872:Water Movements; D014876:Water Pollution; D060753:Water Quality; D014887:Weather
chemical_list: D012722:Sewage
keywords: First flush; Illicit cross-connection; Overflow pollution; Pumping discharge; Storm drains