遵义市坪桥地下水系统锰污染现状及污染模式分析

Manganese pollution status and pollution patterns in the groundwater system of Pingqiao,Zunyi

以遵义市坪桥地下水系统为研究对象,对系统内丰、枯水期27个相同的地下水监测点进行采样分析,并按照相关技术规范,就锰指标情况对地下水水质进行了分析评价,地下水系统枯水期水质要优于丰水期,从上游向下游,地下水污染程度逐渐加深,且到子系统(Ⅰ)地下水出口水质以V类为主。根据地下水系统锰的分布特征,确定锰污染主要污染源为系统内含锰废渣堆场、污水汇集塘、天磁锰业集团的尾渣库渗滤液回收竖井。结合地下水系统污染源分布特征、废渣堆放方式、污染方式等建立了天磁锰业集团尾渣库及周边地区含锰污染物污染地下水的6种污染模式,并对其污染特性进行了分析总结,同时制作了天磁锰业集团尾渣库及其周边地区地下水锰污染的迁移模式图。

Taking the groundwater system of Pingqiao Village in Zunyi as the research object,sampling and analysis were conducted at 27 groundwater monitoring sites during the wet season and dry season.According to relevant technical specifications,the groundwater quality was analysed and evaluated based on the manganese index.The water quality of the groundwater system during the dry season was better than that during the wet season.From upstream to downstream,the degree of groundwater pollution gradually deepened,and the water quality at the groundwater outlet of subsystem(I)was mainly Class V.Based on the distribution characteristics of manganese in the groundwater system,it was determined that the main sources of manganese pollution were the manganese-containing residue storage yard,the sewage collection pond,and the leachate recovery shaft of the factory.On the basis of the distribution characteristics of pollution sources in the groundwater system,the residue storage method,and the pollution method,six pollution modes of manganese-containing pollutants around the factory were established,and the pollution characteristics were analysed and summarized.The migration pattern of groundwater manganese pollution around the factory was depicted.