化工固废井下充填对地下水环境的影响研究
Study on Environmental Impact of Underground Backfilling with Chemical Solid Waste
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摘要: 为了研究化工固废井下充填污染物对地下水环境的影响问题,以葫芦素矿井为研究对象,利用Modflow软件建立研究区数值模型,并对其进行识别验证,基于数值模型的基础上,耦合溶质运移模型,对化工固废井下充填污染物运移规律进行模拟预测。结果表明:锅炉细灰浸出液污染物仅在2-1煤层有超标现象,且充填区外最大超标距离为14.31 m,不会造成矿井水的二次污染。鉴于安全保证,建议留设30 m保护煤柱进行充填;化工固废井下充填,可以缓解土地占用问题,减少环境的污染,实现废弃物的再利用,节约成本。Abstract: Taking Hulusu Coal Mine as an example, a groundwater numerical simulation model was set up by using Modflow to research the influence of chemical industry solid wastes from the mine underground backfilling on ground water environment, and the model was recognized and validated. The groundwater numerical simulation model and the solute transport model were coupled to predict the laws of contaminants transporting and three main conclusions were drawn down in this research as follows: the pollutant of the fine particles generated during coal combustion exceeded the standard value only in 2-1 coal seam, and the maximum faster distance beyond the standard value is 14.31 m, which will not cause the pollution of the mine water; considering the safety assurance, it is suggested to reserve 30 m protective coal pillar before backfilling. The chemical industry solid wastes backfill in mine can solve the problem of the land occupation, reduce the risk of environment pollution, reuse the solid wastes and save cost.
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