Research On Percolation And Sewage Interception Riverside Eco-technology In Old Haihe River

As the treatment of point source pollution has become more and more effective in China,the prevention and control technology of non-point source pollution has been closely watched by researchers.Using the 1000 m demonstration section which is located in the town of Xianshuigu as the experimental point,we set up riverside ecological percolation and sewage interception systems which are suitable of the old Haihe river's regional characteristics,and do study on eco-technology in the systems.This paper provides theoretical basis and technical support for the implementation of the control measures of non-point pollution,such as the selection of matrix of water treatment and the treatment process of percolation and sewage interception technology.In this thesis,the experiments were carried out to explore the combination of the optional packing.Use filter materials with the mixed volume for the application of old Haihe River's ecological percolation and sewage interception pool.With microbial immobilization technology,activated sludge and algae were immobilized on the zeolite and anthracite to form biofilm,and the removal effects of rainfall runoff were investigated.The material with ecological oxygen-release function was also studied.A set of stereo ecological packing was built with the combination of oxygen-release material and zeolite and anthracite biofilm.This stereo ecological packing was applied to the percolation test for sewage removal.The results showed that the packing's average removal rate of SS,total nitrogen,ammonia nitrogen,total phosphorus,COD were 90.16%,35.65%,44.65%,35.65% and 55.50%,respectively,which showed good treatment effects on rainfall runoff.With reference to the concept of artificial wetland technology,phytoremediation technology applied in old Haihe River ecological percolation and sewage interception system.The results showed that removal rate of SS and COD can reach 33% and 17%respectively;the circulation purification effects of non-monsoon river water were in the range of 20%-93% for SS and 8-41% for COD.When the SS,COD,ammonia nitrogen,total nitrogen concentration and total phosphorus concentration were less than 70 mg/L,60 mg/L,2.0 mg/L,2.0 mg/L,and 2.0 mg/L,respectively,the water cycle was not suitable,or the removal effects were non-significant.When the removalrate showed a downward trend,the system should be dry for more than 1 week to restore the purification effects.Through a series of studies in this thesis,it can basically achieve the goal of non-point source pollution source reduction in rainy season and water purification in non-rainy reason.It has some guiding effect on the similar demonstration project.