垃圾污染场地浅层地下水中铁锰时空变异的胶体效应  

Colloid Effects on Temporal-spatial Variability of Iron and Manganese in Shallow Groundwater of Garbage Contaminated Sites

作　　者：马杰[1] 李海明[1] 顾晓明[1] 李云[1] 

机构地区：[1]天津科技大学滨海地下水利用与保护研究室,天津300457

出　　处：《环境科学》2011年第3期908-912,共5页Environmental Science

基　　金：国家自然科学基金项目(40872156;40602029);国家水体污染控制与治理科技重大专项(2009ZX07212-003)

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.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.

关 键 词：垃圾渗滤液 污染羽 铁锰 迁移 胶体效应 

分 类 号：X523[环境科学与工程—环境工程]