Analysis of the Cause of Water Pollution and Its Control Strategies in Baiyin Reach of the Yellow River

The water quality of the Yellow River in Baiyin reach was assessed and the cause of the pollution was analyzed by single index and comprehensive index.According to the measuring data of water quality of the Yellow River from 2000 to 2004,which was provided by Baiyin Environment Protection Bureau.The results showed that the contents of total coliforms,COD and TP in the Yellow River were many times more than the standards;from time distribution,the pollution of water in high flow period and in average flow period was most severe,the pollution of water was serious in low flow period;from space distribution,the pollution of water in Qingchengqiao was the most serious,the pollution of water in Jingyuanqiao was severer than the pollution of water in Wufosi;total coliforms,COD and TP were main pollutants,the contribution of the pollutants resulted from non-point source which was caused by industrial and agricultural activities were 88.08%,while the contribution of the pollutants resulted from point source which was caused by industrial sewage water and domestic sources were 11.92%;finally,some suggestions to control the water pollution were put forward.