重金属污染土壤化学固化技术与萃取修复技术的应用及修复效果(英文)

被引:9
作者
刘云国 [1 ]
夏文斌 [1 ]
黄宝荣 [2 ]
张慧智 [3 ]
高慧 [1 ]
李欣 [1 ]
徐卫华 [1 ]
机构
[1] 湖南大学环境科学与工程学院
[2] 中国科学院生态中心
[3] 中国科学院南京土壤研究所
关键词
环境科学与技术; 重金属; 胡敏酸固定技术; 土壤冲洗; 修复;
D O I
10.14067/j.cnki.1673-923x.2008.04.002
中图分类号
X53 [土壤污染及其防治];
学科分类号
082803 ; 120405 ;
摘要
固定化和化学冲洗是土壤中金属污染治理常用技术.研究分别用0.4%,1.2%和2.0%的胡敏酸固定化2种重金属污染土壤样品,并通过分析Pb,Cd,Cu和Zn的存在形态来检验其固定效果,结果表明,胡敏酸可以将大部分的Pb和Cd转化为残留态以及有机结合态,大大降低其生物有效性,从而降低了其环境风险.但是,由于该技术受制于胡敏酸在土壤中的流动性,他必须和其他技术如化学萃取技术联合才可以实际应用.分别以0.5mol/L的EDTA,草酸(OX),柠檬酸(CA)以及柠檬酸和鼠李糖脂(CAR)为萃取剂,进行了进一步的萃取试验.结果表明:EDTA对Pb和Cd的去除效果最好;OX对Cu和Zn的去除效果最好;胡敏酸有利于Cu和Zn的去除,但是抑制Pb和Cd的去除;鼠李糖脂促进Pb,Cd,Cu和Zn的去除.但是,修复成本较高,该技术离实际应用还有一定的距离.
引用
收藏
页码:129 / 135
页数:7
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