Study on Quantification Method for the Risk of Surface Water Environmental Pollution Caused by Sewage Irrigation in Agriculture

摘要

In agriculture, the risk of surface water environmental pollution caused by sewage irrigation is a verycomplicated problem. It depends on runoff pollution along rivers, lakes or estuary upper reaches andis non-point source pollution of water. In addition, it is a gradual process and its contributing reasonsinclude many natural environmental factors, humanities, and social and economic conditions. Whilepointing out the mechanism of surface water pollution, this paper introduced the concept of “risk ofsurface water environmental pollution caused by sewage irrigation”. It builds the quantitative model forthe risk of pollution caused by sewage irrigation to surface water, in light of the inadequate study onthe seriousness of pollution of farmland sewage irrigation caused to the surface water as well asbased on such index assessment methods as single factor contaminant index, N.J. Nemerow pollutionindex and Ross water quality index. It also, through example application, indicates that this model canaccurately reflect the degree of pollution caused by sewage irrigation to surface water.