| The construction of rain and sewage diversion drainage network system effectively prevents the overflow sewage of joint pipe network into the urban water,but also makes the all surface runoff rainwater pollutants into the water,will still lead to increase of water pollution.Therefore,in recent years,the study on the impact of rainwater runoff pollution and its impact on urban water has been paid more attention.This paper has carried out the research work of "Twelfth Five-Year" Science and Technology Major Water Project "Yixing Urban Water Environment Quality Improvement and Comprehensive Demonstration Project".Analysis on the influence of surface runoff on river water quality in Yixing City.According to the characteristics of Yixing rainwater pipe network and receptive river layout,the two areas and rivers of Lvyuan Road and Lvyuan River,Jingyi Road and Changwei River were selected as the research object,and the water quality of surface runoff and water quality of the receiving water bodies were monitored.This paper analyzes the characteristics and influencing factors of the water quality of the river water before and after the input of the surface runoff,and puts forward the technical measures to reduce the surface runoff pollutants and repair the river water,so as to provide technical technology for the improvement of water pollution control and water environment quality in Yixing City in accordance with.The main contents and results of this paper are as follows:(1)Surface runoff and river water quality characteristicsCompared with the national surface water environmental quality standard,the COD and TN in the surface runoff of Lvyuan Road were serious exceeded,and the water quality of NH3-N and TP was relatively better.The pollution of COD and TN in Jingyi Road was is more serious than Lvyuan Road.The concentration of NH3-N and TP in water is alao higher than that of Lvyuan Road,but not more than V class water quality standards.Before the rainfall,the water quality of the river is good,and the concentration of COD,NH3-N and TP are lower than the national surface water quality standard,except TN.After the surface runoff input,the pollutant concentration of the river has increased by different degrees,Lvyuan river pollutant indicators of are basically inferior V class water quality standards.Changwei River pollutant indicators are inferior V class water quality standards.(2)Characteristics of runoff pollution and its influencing factorsThere is a significant correlation between turbidity and COD and TP in surface runoff,indicating that some COD and TP in surface runoff exist in granular form,which can be removed by strengthening the surface cleaning and trapping.The longer the accumulated number of sunny days,and the more pollutants will be brought into the water body,the greater the degree of water pollution will be.Rainfall and rainfall intensity are two of the important influencing factors of water pollutants after surface runoff input.The effect of short-term heavy rainfall is greater than that of long-term weak rainfall.(3)Technical measures to reduce pollutionAccording to the different characteristics of pollution and treatment path,there are two technical measures that can be used to repair polluted water bodies: the interception and cutting of surface runoff pollutants,and the water restoration technology in river course.According to the surface runoff and river water quality pollution in Yixing City,it is suggested that the "sedimentation-filtration-biological treatment-filtration" technology route should be used to cut the surface runoff pollutants,and the river water quality should be used to repair the river water quality. |
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