宁夏水环境污染成因分析与评价

Analysis and Evaluation of Causes of Water Environment Pollution in Ningxia

针对引黄灌区退水排水沟多,水环境污染严重现象,从农田退水污染、污水灌区土壤水污染和生活污水污染3个方面进行分析与评价。结果表明:宁夏灌区农田退水污染物主要来自农田种植和畜禽养殖,银川市区污染负荷总量贡献率较大,但在灌区几个市中,银川市排水沟水质情况总体较好,同时银川市、永宁、贺兰县以及青铜峡市污灌区灌溉水质均为清洁水平,但是中卫市和吴忠市利通区污灌水质为重度污染,已不能作为农田灌溉用水。

Aiming at the situation of innumerous drainage ditches and serious pollution of the water environment in the Yellow River Irrigation Area, an analysis and evaluation are made from the aspects of farmland returned water pollution, soil water pollution of sewage irrigation area and sewage pollution. The results showed that the farmland returned water pollutant was mainly from farmland planting and livestock breeding in Ningxia irrigation area. The contribution rate of the total pollution load of Yinchuan city was relatively large, but among several cities of the irrigation area, the water qualities of the drainage ditches of Yinchuan city were relatively good. At the same time, the irrigation water qualities of the sewage irrigation areas in Yinchuan municipality, Yongning county, Helan county and Qingtongxia municipality were all at the clean level, but the sewage irrigation water qualities in Zhongwei municipality and Litong district in Wuzhong municipality were at serious pollution and could not be used as irrigation water.