title: Influences of rainfall variables and antecedent discharge on urban effluent concentrations and loads in wet weather.
abstract: For storm drainages inappropriately connected with sewage, wet weather discharge is a major factor that adversely affects receiving waters. A study of the wet weather influences of rainfall-discharge variables on storm drainages connected with sewage was conducted in the downtown Shanghai area (374 ha). Two indicators, event mean concentration (EMC) and event pollutant load per unit area (EPL), were used to describe the pollution discharge during 20 rain events. The study showed that the total rainfall and discharge volume were important factors that affect the EMCs and EPLs of the chemical oxygen demand, total phosphorus, and especially those of NH4+-N. The pollutant concentrations at the beginning of the discharge and the discharge period were also major factors that influence the EMCs of these three pollutants. Regression relationships between the rainfall-discharge variables and discharge volume/ EPLs (R2= 0.824-0.981) were stronger than the relationships between the rainfall-discharge variables and EMCs. These regression equations can be considered reliable in the system, with a relative validation error of less than ±10% for the discharge volume, and less than ±20% for the EPLs. The results presented in this paper provide guidance for effectively controlling pollution in similar storm drainages.
authors.affiliation: Key Laboratory of Yangtze River Water Environment, Ministry of Education, Tongji University, Shanghai 200092, China E-mail: xionglj@saes.sh.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 E-mail: xionglj@saes.sh.cn.
authors.forename: Lijun
authors.initials: L
authors.lastname: Xiong
authors.affiliation: Key Laboratory of Yangtze River Water Environment, Ministry of Education, Tongji University, Shanghai 200092, China E-mail: xionglj@saes.sh.cn.
authors.forename: Huaizheng
authors.initials: H
authors.lastname: Li
authors.affiliation: Key Laboratory of Yangtze River Water Environment, Ministry of Education, Tongji University, Shanghai 200092, China E-mail: xionglj@saes.sh.cn.
authors.forename: Zhengliang
authors.initials: Z
authors.lastname: Liao
authors.affiliation: Key Laboratory of Yangtze River Water Environment, Ministry of Education, Tongji University, Shanghai 200092, China E-mail: xionglj@saes.sh.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 E-mail: xionglj@saes.sh.cn.
authors.forename: Jun
authors.initials: J
authors.lastname: Wu
authors.affiliation: Key Laboratory of Yangtze River Water Environment, Ministry of Education, Tongji University, Shanghai 200092, China E-mail: xionglj@saes.sh.cn.
authors.forename: Jin
authors.initials: J
authors.lastname: Xu
authors.affiliation: Key Laboratory of Yangtze River Water Environment, Ministry of Education, Tongji University, Shanghai 200092, China E-mail: xionglj@saes.sh.cn.
authors.forename: Hao
authors.initials: H
authors.lastname: Chen
mesh_terms: D057919:Biological Oxygen Demand Analysis; D002681:China; D004784:Environmental Monitoring; D010758:Phosphorus / Q000032:analysis; D011891:Rain / Q000737:chemistry*; D012722:Sewage / Q000032:analysis*; D062065:Wastewater; D014872:Water Movements; D014874:Water Pollutants, Chemical / Q000737:chemistry; D014887:Weather
chemical_list: D010758:Phosphorus; D012722:Sewage; D062065:Wastewater; D014874:Water Pollutants, Chemical