贵阳市乌当区南明河水系水环境质量评价

Environmental quality assessment for water system of Nanming River in Wudang region of Guiyang city

乌当区南明河水系水污染复杂多样，污染的主要来源是生活污水和工业污水。于2004年对乌当区南明河水系的水环境质量进行监测和评价，结果表明，乌当区南明河水系的水污染严重，大部分支流的水体质量为Ⅲ-Ⅳ级，其中，南明河干流及其主要支流三江河等的水体质量为Ⅳ-Ⅴ级或〉Ⅴ级，为严重污染型水体，污染类型为有机型污染，主要污染物是硫化物、BOD5、COD、挥发酚4种。南明河上、中、下游综合污染指数分别为2、2、1．6，上、中游属于严重污染水体，下游属于重污染水体。

The pollutants in Nanming River are complicated in Wudang region, where the major contaminants are from sewage and industrial effluents. Environmental quality determination and assessment were made for water system of Nanming River in Wudang region in 2004, and the main conclusions were as follows ： the current pollution of water system in Nanming River was severe, quality of water environment in most branches was between m and Ⅳ degree, and the main river and the major branches （Sanjiang River, ete）of Nanming River were serious pollution with water quality from Ⅳ to Ⅴ or more thanV that contaminated type was organic pollution and the major contaminants were BOD5, COD and volatile phenol. Synthetical pollution index in the upper,middle and lower parts of Nanming River reached 2,2,1.6 respectively, which belonged to serious pollution water.