适用异位淋洗修复技术的铬污染土壤条件探究  

DISCUSSION ON AVAILABLE CONDITIONS OF EX-SITU SOIL WASHING FOR REMEDIATION OF CHROMIUM-CONTAMINATED SOILS

作　　者：熊惠磊 王璇 马骏 夏凤英 韩春媚 裴宇 于凯婷 

机构地区：[1]北京建工环境修复股份有限公司,北京100015

出　　处：《环境工程》2016年第11期155-161,共7页Environmental Engineering

摘　　要：土壤理化特性、污染物分布情况、污染物存在形态和淋洗剂类型均为影响异位淋洗技术的关键因素。针对两种类型的铬污染土壤开展了异位淋洗对比试验,结果表明:当污染土壤中粗颗粒物料(砾石、砂砾、粗砂和中粗砂)质量分数超过70%,总铬和六价铬在细颗粒物料(细砂和粉土)中含量大于其总含量的60%,且水溶态和弱酸提取态铬占比超过50%时,仅以去离子水作为淋洗剂,粗颗粒物料的六价铬去除率即可达到70%。The nature of soil,contaminatants＇ distribution,existing forms of the contamination,and the eluent is the key influencing factors for soil washing. By comparing the ex-situ soil washing tests result for two kinds of chromium-contamination soil,the suitable condition for ex-situ soil washing was found as follows： The proportion of coarse particle matirials such as stone,gravel,grit and medium grit exceeds 70% of the total soil mass; the proportion of total chromium and hexavalent chromium in fine particle matirials,including fine sand and silt is higher than 60% of the total chromium content; and the mass ratio of exchangeable and carbonate chromium fractions exceeds 50%. Under this condition,after washed by deionized water,more than 80% of hexavalent chromium could be removed in coarse particle materials.

关 键 词：铬污染土壤 异位淋洗 粒径分布 淋洗剂 土壤修复 

分 类 号：X53[环境科学与工程—环境工程]