甘肃白银东大沟铅锌镉复合污染场地水泥固化稳定化原位修复

发布时间：2018-01-08 21:20

本文关键词：甘肃白银东大沟铅锌镉复合污染场地水泥固化稳定化原位修复　出处：《环境科学》2017年09期 　论文类型：期刊论文

【摘要】：以甘肃白银东大沟Pb、Zn、Cd复合污染土壤为研究对象,通过毒性浸出、形态提取、微观分析等手段,研究了水泥对重金属污染场地的固化稳定化效果及适用性.毒性浸出结果表明,水泥对污染土壤中Cd、Zn能够起到较好的固化稳定化作用,在5%的添加量下,水泥对Cd、Zn的修复效率分别达到99.5%~100%、96.6%~98.8%,而Pb的浸出浓度提高了2.6~5.8倍;在8%的添加量下,水泥对Cd、Zn的修复效率分别达到99.6%~100%,94.4%~97.9%,而Pb的浸出浓度提高了1.9~12.5倍.形态分析结果表明,水泥能够使土壤中的酸可提取态Cd、Zn向残渣态转化,可还原态Pb向可氧化态、残渣态转化,稳定性增强.微观特征分析结果表明,Pb~(2+)、Zn2+、Cd2+这3种离子可以参与水泥的水化反应,生成相应的硅酸盐矿物和氢氧化物,进而对其起到固化稳定化作用.综上,水泥在重金属污染场地修复工程中具有良好的优势,但在具体应用过程中需注意场地及环境条件的特殊性.
[Abstract]:In Gansu, Baiyin Pb, Zn, Cd contaminated soil as the research object, through leaching, extraction, microscopic analysis, study on heavy metal contaminated sites cement solidification and stabilization effect and applicability. The leaching test results show that the cement soil pollution of Cd, Zn is able to cure the stabilizing effect is better, in addition to 5%, cement Cd, repair efficiency of Zn reached 99.5%~100%, 96.6%~98.8%, and Pb leaching concentrations increased 2.6~5.8 times; in addition 8%, cement Cd, repair efficiency of Zn reached 99.6%~100%, 94.4%~97.9%, and Pb leaching concentration increased 1.9~12.5 times. Morphological analysis results show that the cement soil can make the acid extractable Cd, the conversion of Zn to residualfractions, reducible to Pb oxidation state, residue conversion, enhanced stability. Results analysis of microscopic characteristics showed that Pb~ (2+), Zn2+, Cd2+ 3 Hydration of ions can be generated in the cement, silicate minerals and hydroxides, and has cured stabilizing effect. To sum up, cement has a good advantage in the heavy metal contaminated site remediation projects, but the particularity in the specific application process should pay attention to the site and environmental conditions.

【作者单位】：中国科学院地理科学与资源研究所陆地表层格局与模拟院重点实验室;中原工学院建筑工程学院;中国环境科学研究院环境基准与风险评估国家重点实验室;北京建筑材料科学研究总院固废资源化利用与节能建材国家重点实验室;东南大学交通学院;北京市第二中学;
【基金】：国家高技术研究发展计划(863)项目(2013AA06A206) 北京市科技计划重大项目(D161100004716001)
【分类号】：X53;X753
【正文快照】： 北京100010)随着城市化和工业化的快速发展,作为人类生存与发展所必须的自然资源之一的土壤却面临着日益严重的环境安全问题[1].据2014年《全国土壤污染状况调查公报》显示,全国土壤环境状况不容乐观,其中工矿业及其废弃地土壤环境问题尤为突出,在调查的690家重污染企业用地及

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