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Experiments on water quality and split-flow of pavement rainfall |
School of Environmental and Safety Engineering, Jiangsu University, Zhenjiang, Jiangsu 212013, China |
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Abstract Based on the sampling and testing of 10 different rainfalls, the pollution situation and the water quality change of urban rainwater runoff in urban area were analyzed. The results show that the initial rainfall runoff pollution is serious. The highest concentrations of SS, COD, NH3-N and TP in the initial pavement runoff can reach 410.00, 282.40, 11.18 and 1.20 mg?L-1, respectively. With the increasing of rainfall duration, the pollutant concentration is gradually decreased with final tending to stabilization. The engineering simulation of split-flow on the initial road rainwater illuminates that the reduction rates of COD,TP,SS and NH3-N on the pavement can respectively reach 48.15%,51.77%,56.91% and 33.45% when the amount of initial rainwater split-flow is 3 mm. The initial rainwater disposal can be used as primary treatment of pavement rainwater reuse system to improve the water quality under different rainfall patterns.
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Received: 06 August 2018
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