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首页> 外文会议>International Conference on Remediation of Chlorinated adn Recalcitrant Compounds >Fate of Arsenic, Iron, and Lanthanum in Arsenic-Contaminated Soils Treated with Ferrous Sulfate and Ferrous Sulfate-Lanthanum Chloride
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Fate of Arsenic, Iron, and Lanthanum in Arsenic-Contaminated Soils Treated with Ferrous Sulfate and Ferrous Sulfate-Lanthanum Chloride

机译：砷污染土壤中砷，铁和镧的命运含有硫酸亚铁和硫酸亚硫酸铁 - 氯化含铁 - 氯化含铁物质的污染土壤

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Arsenic-contaminated soils collected from five locations in the southeastern United States were used in lab-scale column experiments with FeSO4·7H2O (FS) and FeSO4·7H2O plus LaCl3·7H2O (FSLA) solutions. These experiments were designed to determine the retardation, retention, and distribution of As, Fe, and La in these soils during and after treatments. All soils showed significant capacities for retention of Fe and La during treatments. Primary retardation of Fe was dependent on oxygen availability in the columns controlled by the fluid flow scheme. Unsaturated fluid flow resulted in late Fe breakthrough and higher retention of Fe at the proximal column sections. Saturated fluid flow yielded similar Fe distribution trends, but early breakthrough and lower overall retention. No significant Fe was eluted from the treated soils during synthetic acid rain (SAR) leaching. The distributions of La, though not as variable as Fe, were relatively lower at the proximal end than at the distal end. In addition, all soils other than PA showed a larger proportion (20-43%) of La mobilization from the treated soils during leaching. No significant As was released during SAR leaching from both FS and FSLA treated soils. All treated soil columns showed uniform or slightly higher As distribution at the proximal end.
机译：从东南部的五个地点收集的砷污染的土壤用于实验室规模柱实验，使用Feso4·7H2O（FS）和Feso4·7H2O Plus LacL3·7H2O（FSLA）解决方案。这些实验旨在在治疗期间和后，确定这些土壤中的延迟，保留和分布在这些土壤中。所有土壤显示出在治疗过程中保留Fe和La的显着能力。 Fe的初步延迟依赖于由流体流动方案控制的柱中的氧可用性。不饱和流体流动导致晚期Fe突破和近端柱部分的Fe保留更高。饱和的流体流动产生类似的Fe分布趋势，但早期突破和总体保留较低。在合成酸雨（SAR）浸出过程中，从处理过的土壤中没有显着的Fe洗脱。 La的分布虽然不是作为Fe的变量，但在近端的近端比远端相对较低。此外，除了PA之外的所有土壤显示出在浸出过程中的处理过的土壤中的较大比例（20-43％）La Mobilization。从FS和FSLA处理的土壤中的SAR浸出期间没有显着。所有经过处理的土壤柱都显示出均匀或稍高的分布在近端。

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