湘江衡阳段水质污染现状及对策分析

对湘江衡阳段构建模糊综合评价模型,结果表明松柏断面呈重金属污染且污染最为严重,枣子坪和站门前断面氮磷污染严重。运用单因子评价指数法计算出主要污染指标9年的污染指数,分析各污染指标的时间变化规律,并使用Spearman秩相关系数法检验变化的显著性,得出:9年来总磷、铅显著下降,高锰酸钾指数、氨氮、汞污染有弱下降趋势,砷污染呈不明显上升,镉有显著上升趋势。

Current Polluted Situation and Countermeasures Analysis on Water Quality of Xiangjiang River in Hengyang City

Founding the fuzzy comprehensive evaluation model for Xiangjiang river of Hengyang , it can he concluded that heavy metal is principal pollution around Bosong section which is most seriously polluted, and water around Zaoziping section and Zhanmenqian section is polluted by N and P evidently. Applying the method of single-factor assessment index, we calculate pollution index of the main factors to find out their variation tendency during nine years. And by using Spearman correlation coefficient method to test the significance of their variation tendency. Total P and Pb decline obviously. CODM, ,NH4-N and Hg have inconspicuous tendency of decrease, Se increases inconspicuously, and Cd has the obvious tendency of increase.