Water Environment Assessment of Danhe River and Study on Evolution Features of Pollution

To realize the water quality status and evolution trends of Danhe River in recent years,based on the water quality monitoring data from 6 monitoring sections of Danhe River from 2004 to 2008,4 kinds of pollutants,such as COD,BOD5,NH3-N,Petroleum were selected which mainly affected the water quality of Danhe River,then water environment quality of Danhe river was assessed by fuzzy compreheusive evaluation method and its evolution of trends was also analysised by integrated pollution index method and spearman rank correlation coefficient method.The results showed that Danhe River pollution was serious and it belonged to class Ⅴ,especially,the sections of Gaoping and Shuidong bridge did.Protection of water environment was urgent,but the water quality was improved on the whole.At last,the relevant suggestions about surface water protection and water environment management were putted forward on this basis.