高粘性土壤中重金属的洗涤效果初探

发布时间：2018-01-11 09:26

本文关键词：高粘性土壤中重金属的洗涤效果初探　出处：《环境科学与技术》2016年S2期 　论文类型：期刊论文

更多相关文章： 高粘性 重金属 污染土壤 土壤淋洗

【摘要】：利用三氯化铁(FeCl_3)、草酸和十二烷基磺酸钠(SDS)3种淋洗剂对典型高粘性重金属污染土壤进行淋洗处理,考察淋洗剂浓度、淋洗时间和淋洗次数对重金属去除效率的影响。当浓度为0.1 mol/L时,Fe Cl3对土壤中Cu、Pb、Zn、Ni和Cr的去除率分别为63.4%、22.8%、17.5%、37.9%和10.0%,草酸对重金属的去除率分别为52.7%、0%、19.6%、20.6%和3.3%,SDS对重金属的去除率分别为2.8%、13.6%、2.5%、9.8%和10.2%。重金属的去除率在1 h内即达到相对平衡,重金属的淋洗去除作用在4 h内随着时间的增加并未发生明显变化。淋洗3次后,Fe Cl3可以去除土壤中超过95%的Cu和Ni,对于Pb的去除率也较高,超过70%,草酸对Cu和Zn具有良好的去除效率,SDS对重金属的去除效果较差。
[Abstract]:Three kinds of leaching agents, FeCl3, oxalic acid and sodium 12 alkyl sulfonate, were used to elucidate the soils contaminated by heavy metals with high viscosity, and the concentration of eluent was investigated. The effects of leaching time and times of leaching on the removal efficiency of heavy metals. When the concentration was 0. 1 mol/L, Fe Cl3 was used to treat Cu PbN Zn in soil. The removal rates of Ni and Cr were 63.4% and 10.0%, respectively. The removal rates of oxalic acid for heavy metals were 52.7% and 19.6%, respectively. The removal rates of heavy metals in 20.6% and 3.3 SDS were 2.5% and 2.5%, respectively. The removal rate of heavy metals reached relative equilibrium within 1 h, and the elution and removal of heavy metals did not change significantly with the increase of time within 4 h. Fe Cl3 can remove more than 95% Cu and Ni in soil, and the removal rate of Pb is higher than 70%. Oxalic acid has good removal efficiency for Cu and Zn. The removal efficiency of heavy metals by SDS is poor.
【作者单位】：上海市环境科学研究院;华东理工大学资源与环境工程学院;
【基金】：上海市环境保护局科研项目(GZ1607) 上海市科委科研计划项目(14231200501)
【分类号】：X53
【正文快照】： 针对场地重金属污染土壤,我国目前采用最为广泛的技术为固化/稳定化。然而,该技术从原理上是依靠改变污染物的化学形态降低重金属迁移性和生物有效性,并未从总量上将重金属污染物去除,从而限制了修复后土壤的最终处置方式。针对这一现状,基于总量去除的重金属污染土壤修复技术

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