Agricultural non-point source pollution is probably the largest source of water pollution, contributing to eutrophication of Lake Erhai. In this paper, a non-point source pollution control technology evaluation index system considering environmental benefit, economic benefit and ecological benefit is established, and the indicators include TP removal efficiency, COD removal efficiency, ammonia removal efficiency, construction cost, operating cost, technology stability, management easiness degree and ecological coordination degree. At the same time, on the basis of non-point source pollution control technology choice in Lake Erhai, the hierarchy-grey correlation analysis method is used to evaluate the comprehensive correlation degrees of alternative technologies and obtain the optimal solution. The result shows that in the sewage pollution control alternatives, soil purification tank is the optimal scheme. In livestock and poultry breeding pollution control alternatives, substrate cultivation technique is the optimal. In farmland pollution control schemes, constructed wetland is the optimal.

Erhai Lake  /  agricultural non-point source pollution  /  analytic hierarchy process  /  gray correlation meth