Research on treatment of non-point source agricultural pollution by terminal interception in Erhai Irrigated Area
Agricultural non-point source pollution is the main pollution source of Erhai Lake.In recent years,through a series of treatment measures,the water quality of Erhai Lake has been significantly improved,but the water quality of agricultural irrigation ditches is still not optimistic.Nitrogen and phosphorus are the main pollutants in agricultural irrigation water,with high concentration and difficulty in treatment.In view of agricultural non-point source pollution in Erhai irrigation area and combined with the pilot project implemented,it is proposed to use the end interception method to intercept the initial rainwater with high pollutant concentration,and then recharge farmland after ecological treatment in the end interception zone.On the one hand to reduce the pollution into Erhai physical and chemical,on the other hand to save water.It is estimated that COD can be reduced 1042.74 t/a through terminal interception engineering,accounting for 30.18％of the total reduction.TN reduced 409.95 t/a,accounting for 53.37％of the total reduction;TP reduced by 127.92 t/a,accounting for 24.03％of the total reduction;NH3-N reduced 126.41 t/a,accounting for 61.28％of the total reduction;reduce pollutants significantly.
万方数据
维普
