Technology And Application Of Urban River Pollution Sources In Hangzhou

With the rapid development of social economy and urbanization,the water environment of urban rivers is seriously polluted.In recent years,all parts of the country are actively carrying out urban river water environment control work,as the south of the Yangtze River,Hangzhou has been in the forefront of the country.In the past decade.Hangzhou has invested a great deal of manpower,material and financial resources to improve the water environment of urban rivers,including sewage interception and management,dredging,ecological control,river diversion and so on.At the same time,new technologies and technologies such as environmental protection and ecological silt removal are constantly explored and studied,and different types of river courses are explored for the combination of ecological control technologies,and intelligent information systems are introduced to supervise and dispatch sewage outlets.Under the condition that all kinds of control technologies have reached a certain level and single river course has achieved certain results,a comprehensive and systematic analysis and summary of Hangzhou urban river course control technology is made on the basis of pollution control at the source,and it is particularly necessary to carry out river basin control.Firstly,this paper introduces the classification(point source pollution,non-point source pollution,endogenous pollution),concept,source and research status of urban river pollution sources,then chooses typical river to carry out pilot demonstration projects,and analyzes and summarizes the implementation effect.Taking Hongjianhe and Mantou mountain rain sewage pumping station as the experimental demonstration of point source pollution,through the application effect analysis of composite ecological trough system and bio-ultrafiltration system in the pilot demonstration project,the application scope of two point source pollution control techonologies was put forward;Xintang River was used as the pilot demonstration of non-point source pollution,and the initial rain pollution in Hangzhou was investigated.On the basis of study and analysis,the bypass constructed wetland was selected as the treatment means,and the control effect of bypass constructed wetland on the pollution of initial rain was obtained by collecting field data,designing wetland form and size,analyzing water quality monitoring data,etc.Danong Harbor and Houheng Harbor were used as the pilot demonstration of endogenous pollution.According to different pollution types and pollution degree,the corresponding treatment methods were selected,and the effect of in-situ remediation of black and stinky sediment on endogenous pollution was analyzed and summarized through water quality tracking.Finally,11 rivers in Dinglan area are selected as the pilot demonstration of district management.On the basis of comprehensive investigation of pollution sources,the research on the treatment mode should be carried out pertinently.The regional treatment should be carried out from the aspects of pollution source control,source water quality improvement,self-purification capacity improvement and water ecosystem construction,and the treatment effect should be systematically studied.The unified analysis and summary are of great significance to the application of pollution source control and ecological restoration in Hangzhou urban river.