| 采用离石黄土原位修复煤矸石渗滤液污染地下水 |
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| 引用本文： | 施南迪,董少刚.采用离石黄土原位修复煤矸石渗滤液污染地下水[J].环境科学研究,2013,26(10):1110-1117. |
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| 作者姓名： | 施南迪 董少刚 |
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| 作者单位： | 对外经济贸易大学国际经济贸易学院, 北京 100029 |
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| 基金项目： | 国家自然科学基金项目(41002129) |
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| 摘 要： | 为以较好的技术手段和较低的经济成本治理煤矸石淋滤液、矿坑废水对地下水的污染,通过土柱淋滤试验、PRB (permeable reactive barrier)模拟试验以及场地修复试验,对煤矸石淋滤液中重金属(Zn、Mn、Pb、Cr、Cu、Cd、Hg)及As的吸附性进行了研究. 土柱淋滤试验结果表明:离石黄土(粒径0.05~0.10mm)、亚砂土(粒径0.05~0.10mm)和细沙(粒径>0.10~0.25mm)对煤矸石淋滤液中的重金属(Zn、Mn、Pb、Cr、Cu、Cd、Hg)及As的吸附能力为离石黄土>亚砂土>细沙,其中离石黄土对As的分配系数为2.26L/kg.模拟槽试验表明,在地下水流速为0.20m/d、m(煤矸石):m(离石黄土)分别为5和7的情况下,淋滤液中的As能够全部被黄土墙吸附；m(煤矸石):m(离石黄土)为10时,部分As透过黄土墙向下游迁移. 5个月的场地修复试验表明,利用离石黄土作为PRB的吸附材料能够较好地去除地下水中的重金属(Zn、Mn、Pb、Cr、Cu、Cd、Hg)和As,厚约0.5m的离石黄土墙对被煤矸石淋滤液污染的地下水中Cr的去除率最高,达到70.97%,对Pb的去除率最低,为43.14%.
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| 关 键 词： | 煤矸石 离石黄土 重金属 地下水 As PRB |
| 收稿时间： | 2013/5/10 0:00:00 |
| 修稿时间： | 2013/8/22 0:00:00 |
The Study on Repairing Groundwater Contamination Polluted by Coal Gangue Leachate by Means of Lishi Loess |
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| SHI Nan-di and DONG Shao-gang.The Study on Repairing Groundwater Contamination Polluted by Coal Gangue Leachate by Means of Lishi Loess[J].Research of Environmental Sciences,2013,26(10):1110-1117. |
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| Authors: | SHI Nan-di and DONG Shao-gang |
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| Affiliation: | School of International Trade and Economics, University of International Business and Economics, Beijing 100029, China |
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| Abstract: | A large number of coal gangue emissions has caused a series of ecological and environmental problems such as gangue leachate. It is better to use high technology and economic cost to manage groundwater, which polluted by coal gangue leaching filtrate and mine wastewater. Soil column leaching experiment,simulation experiment of PRB (Permeable Reactive Barrier), and on-site actual repairing experiments were conducted to repair groundwater, which was polluted by Zn, Mn, Pb, Cr, Cu, Cd, Hg and As in coal gangue leaching filtrate. The experiments on soil column leaching showed the adsorption capacities on heavy metals by Lishi loess (particle size is 0.05-0.10mm), sand loam (particle size is 0.05-0.10mm) and silver sand (>0.10-0.25mm) were ordered as:Lishi loess>sand loam>silver sand. Among these materials, the distribution coefficient of Lishi loess to As was with the maximum value of 2.26L/kg. Heavy metal and As in leachate were removed by the wall of Lishi loess, when velocity of groundwater is 0.20m/d and the mass ratio of coal gangue to loess were 5and 7.In the case of 10, part of the As migrated to downstream through the loess wall. The 5-month site remediation experiments showed that using loess as adsorption material in PRB can better removal of heavy metals (Zn, Mn, Pb, Cr, Cu, Cd, Hg) and As in the groundwater. Loess wall with the thickness of 0.5m can remove Cr in the groundwater contaminated by coal gangue leachate. The removal rate of Cr was the highest (70.97%) and the removal rate of Pb was the lowest (43.14%). In actual field repair, for Lishi loess as the adsorption material in PRB technology has a good application prospect. |
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| Keywords: | coal gangue Lishi loess heavy metal groundwater As PRB |
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