Assessment of water quality and source apportionment of pollution in Liao River Basin

Based on the water system characteristics of the Liao River Basin,six typical water quality indexes,including COD,BOD5,NH3-N,were selected.The water quality of the main river in the Liao River Basin was assessed using the integrated water quality index evaluation method.The source apportionment of main pollutants in the main river of the Liao River Basin was conducted using the multivariate statistical analysis method.The results show that the water pollution in the middle and lower reaches of the Liao River Basin is more serious.In the Liao River Basin,there are three kinds of typical water pollutants,whose contribution rates were 56.85%,18.23% and 17.51%,respectively.