煤炭地下气化地下水质量影响评价及其趋势分析

Impact assessment and trend analysis of underground coal gasification on groundwater quality

采用传统水质评价方法对内蒙古某煤炭地下气化研究区的地下水水质进行质量影响评价,分析表明3种传统方法均不能指示煤炭地下气化对地下水环境影响程度,而场地影响指数和单项污染指数则可较好表征煤炭地下气化对地下水质量影响的程度.硫酸盐、氯化物、溶解性固体和挥发酚为主要污染因子,应重点防控.此外,采用数值模拟模型预测煤层气化3年硫酸盐对下游含水层水质的长期迁移扩散,显示10年内均有一定程度影响.

The traditional approaches were used to assess the impact of underground coal gasification （UCG） on groundwater quality. The results show that all of those methods cannot reflect the groundwater pollution from UCG effectively, while the site influence index and single pollution index approaches work well. Sulfate, chlorine, dissolved solids, and volatile phenol were main pollution components. In addition, we study the long-term effects of sulfate in UCG of 3 years on downgradient aquifer by using numerical simulation, and the results predict that the effect time would not be less than ten years.