废弃铬盐厂土壤中铬的赋存特征及异位淋洗修复可行性研究

发布时间：2018-03-01 19:16

本文关键词： 铬污染粒径分布赋存特征异位土壤淋洗土壤修复　出处：《环境工程学报》2016年11期 　论文类型：期刊论文

【摘要】：土壤理化性质、污染物的分布及赋存特征是土壤异位淋洗技术是否可行的关键依据。以西北某废弃铬盐厂铬污染场地土壤作为研究对象,测定了土壤基本理化参数及各粒径污染物的浓度,探究总铬和六价铬在不同粒径土壤中的分布特征,并通过铬的赋存形态分析确定清水作为淋洗剂,开展异位清水淋洗实验。结果表明:供试土壤粗颗粒物料(粒径分别为:9.50 mm、2.00~9.50 mm、0.841~2.00 mm及0.25~0.841 mm)占土壤总质量的比例达到93.36%,总铬和六价铬污染物富集于土壤细颗粒(粒径0.25 mm);同时,土壤各级粒径颗粒中水溶态和弱酸提取态铬所占比例均大于50%;以清水做淋洗剂时,总铬和六价铬的去除率分别高于60%和80%,且淋洗后土壤各级粒径中六价铬含量均低于30 mg·kg~(-1),达到修复标准要求。
[Abstract]:The physical and chemical properties of soil, the distribution and occurrence of pollutants are the key basis for the feasibility of soil ectopic leaching. The basic physical and chemical parameters of soil and the concentration of pollutants with different particle sizes were measured, and the distribution characteristics of total chromium and hexavalent chromium in different particle size soils were investigated. The results showed that the proportion of coarse grain materials (diameter of 0. 9. 50 mm ~ 2. 00 ~ 9. 50 mm ~ 0. 50 mm ~ 0. 41 mm and 0. 25 ~ 0. 841 mm) to the total soil mass reached 93.3636%. The total chromium and hexavalent chromium pollutants were enriched in fine soil particles (0. 25 mm), and the total chromium and hexavalent chromium pollutants were enriched in the fine soil particles (0. 25 mm). The proportion of water soluble and weak acid extracted chromium in different particle sizes of soil is more than 50%, and when water is used as eluent, The removal rates of total chromium and hexavalent chromium were higher than 60% and 80, respectively, and the content of hexavalent chromium in soil particle sizes was lower than 30 mg 路kg ~ (-1) after leaching, which reached the standard of remediation.
【作者单位】：北京建工环境修复股份有限公司;北京建工环境工程咨询有限责任公司;
【基金】：国家高技术研究发展计划(863计划)项目(2012AA06A201)
【分类号】：X53

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