| 垃圾污染场地浅层地下水中铁锰时空变异的胶体效应 |
| 摘要点击 2923 全文点击 2158 投稿时间：2010-03-24 修订日期：2010-06-17 |
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| 中文关键词 垃圾渗滤液 污染羽 铁锰 迁移 胶体效应 |
| 英文关键词 leachate plume iron and manganese transport colloid effect |
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| 中文摘要 |
| 采用模拟槽试验，研究含水介质中垃圾渗滤液污染羽铁锰时空变异特征，重点分析了土壤胶体对铁、锰在含水介质中迁移转化的影响，最后从对流-弥散、溶解作用和土壤胶体迁移-沉积等角度探讨了铁、锰迁移转化的机制.结果表明，含水介质中铁、锰元素溶解作用导致污染羽中铁、锰浓度高于垃圾渗滤液本身，最高可达渗入槽内渗滤液中所含总Fe和Mn的2.82倍和7.51倍；铁、锰污染羽整体沿水流方向扩展，在对流-弥散和溶解作用下污染羽中心区域逐渐变宽；土壤胶体存在下铁、锰污染羽中心轴线的平均迁移速度分别从1.17 cm/d、 1.75 cm/d增大到1.83 cm/d、 2.5 cm/d，土壤胶体对含水介质中铁、锰的迁移起到了明显的促进作用. |
| 英文摘要 |
| Simulation tank experiment was conducted to elucidate the temporal-spatial variability of Iron and Manganese in leachate pollution plumes of water-bearing media.Colloid effects on transport and transformation of Fe and Mn in water-bearing media were determined emphatically.Moreover,the mechanism of Fe and Mn transport and transformation were discussed by the convection-dispersion,dissolution and transport-deposition of colloid.The results show that the total Fe and Mn in leachate pollution plume was 2.82 times and 7.51 times of infiltration leachate due to the dissolution of water-bearing medium.Along the flow direction,Fe and Mn pollution plumes spread,and the central region of plumes gradually widened by the convection-dispersion and dissolution.In the presence of colloid,the average transport velocity of Fe and Mn plumes central axis from 1.17 cm/d and 1.75 cm/d increased to 1.83 cm/d and 2.5 cm/d respectively,colloid had obvious facilitation to the migration of Fe and Mn. |
