Abstract
Urban pavement runoff has become an important pollution source endangering the quality of urban water. This paper analyzed the characteristics of particle size distribution of road-deposited sediment (RDS). The variation of pollutants with RDS content is presented. Based on continuous sampling of runoff, the variation between pollutant concentration and rainfall characteristics is revealed. The results show that each particle group shares similar content except for the group smaller than 0.075 mm. However, the smaller particles have a stronger ability to adsorb heavy metals (Zn, Pb, Cu), and a weaker ability to adsorb chemical oxygen demand (COD). The concentrations of different pollutants have different relationships with rainfall and runoff time. The concentration of suspended solids (SS) decreases steadily with runoff time, while the concentration of heavy metals increases first and then decreases. The first 30 minutes of runoff is the best time to treat heavy metals and SS. The five-day biochemical oxygen demand (BOD5) and total petroleum hydrocarbons (TPHs) concentration are mainly affected by rainfall intensity. The result presented in this paper may provide a useful reference for the treatment of pavement runoff pollution.
Highlights
The quality of urban drinking water is closely related to the health of every urban resident
In order to analyze the characteristics of urban runoff pollution comprehensively, this study is divided into two parts: (i) collection of solid sediments on the road surface in dry weather, and analysis of the types and relative contents of pollutants; (ii) continuous collection of runoff samples during rainfall, and analysis of the characteristics of pollutants in the runoff
The sediment samples of different particle sizes were digested with aqua regia, and the concentrations of heavy metals were determined by atomic absorption spectrophotometry (Ministry of Ecology and Environment of the People’s Republic of China 1987)
Summary
The quality of urban drinking water is closely related to the health of every urban resident. With the increasing number of vehicles, factories and population, the total amount of pollutants including heavy metals, organic matter and petroleum hydrocarbons pollutants is gradually increasing (Markiewicz et al 2017; Azimi et al 2018; Hou et al 2019) These pollutants generally adhere to the surface of roads and fine-grained sediments (such as dust). In addition to heavy metals, the RDS contains other pollutants that degrade water quality, typically including organic and petroleum hydrocarbons (Hong et al 2019; Liu et al 2019). This paper takes Changsha City as the research object, and analyzes the particle size distribution of RDS, the variation of pollutant content in RDS, the FF characteristics of runoff, and the variation of pollutant concentration in runoff with rainfall intensity and rainfall volume. This paper may provide beneficial references for the treatment of runoff pollutants
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