title: [Colloid effects on temporal-spatial variability of iron and manganese in shallow groundwater of garbage contaminated sites].
abstract: 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.
authors.affiliation: Laboratory of Coastal Groundwater Utilization & Protection, Tianjin University of Science & Technology, Tianjin 300457, China. mj_cyberspace@163.com
authors.forename: Jie
authors.initials: J
authors.lastname: Ma
authors.forename: Hai-Ming
authors.initials: HM
authors.lastname: Li
authors.forename: Xiao-Ming
authors.initials: XM
authors.lastname: Gu
authors.forename: Yun
authors.initials: Y
authors.lastname: Li
mesh_terms: D003102:Colloids; D005735:Garbage; D007501:Iron / Q000032:analysis*; D008345:Manganese / Q000032:analysis*; D012037:Refuse Disposal / Q000379:methods; D012987:Soil / Q000032:analysis*; D012989:Soil Pollutants / Q000032:analysis*; D014872:Water Movements; D014874:Water Pollutants, Chemical / Q000032:analysis*
chemical_list: D003102:Colloids; D012987:Soil; D012989:Soil Pollutants; D014874:Water Pollutants, Chemical; D008345:Manganese; D007501:Iron