Environmental risk assessment method of coal mine rust water to drinking water sources and case study
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摘要: 为了评价煤矿矿井涌水对饮用水水源地的环境风险,采用层次分析法构建了由风险源、风险受体、迁移通道、应急管理4个层面共12项指标构成的评价指标体系,建立了环境风险评价方法,采用该方法从定性和定量角度评价四川某区县3个煤矿对饮用水水源地的环境风险。定性分析结果表明:3个煤矿作为风险源,其水质指标Fe、Zn、Mn超标倍数较高,可能会存在环境风险;风险受体饮用水水源地近年水质达标率为100%,环境容量较大;由风险源至风险受体的迁移通道距离较长,沿途溪流、土壤和植被具备一定的稀释、降解和消纳能力。定量评价结果表明,3个煤矿的环境风险指数分别为0.504 2、0.494 4和0.288 9,对应的环境风险分级分别是一般、一般和较低。Abstract: To evaluate the environmental risk of coal mine water to drinking water sources, the analytic hierarchy process was used to construct an evaluation index system composed of four aspects and 12 indexes. The four aspects included risk source, risk receptor, migration channels and emergency management. An environmental risk assessment method was established so as to evaluate qualitatively and quantitatively the environmental risks of three coal mines to the drinking water sources in a county area of Sichuan Province. The qualitative analysis results showed that the three coal mines were identified as risk sources, the water quality indexes of Fe, Zn, Mn exceeded the standard by a high multiple, which may cause environmental risks. In recent years, the water quality up-to-standard rate of the drinking water sources as risk recipients was 100%, and the environmental capacity was large. The migration channels from the risk sources to the risk receptors had a long distance, and the stream, soil and vegetation along the way had certain dilution, degradation and absorption capacity. The quantitative evaluation results showed that the environmental risk index of the three coal mines was 0.504 2, 0.494 4 and 0.288 9, respectively, and the corresponding environmental risk classification was average, average and low, respectively.
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Key words:
- rust water of coal mine /
- mine /
- gushing water /
- drinking water sources /
- environmental risk assessment
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