铬渣污染场地土壤电动修复研究

被引：24

作者：

吴桐 ^{[1
,2
]}

孟凡生 ^{[1
]}

王业耀 ^{[1
,3
]}

房孝磊 ^{[1
]}

杨琦 ^{[2
]}

机构：

[1] 中国环境科学研究院

[2] 中国地质大学水资源与环境学院

[3] 中国环境监测总站

来源：

安全与环境学报 | 2013年 / 13卷 / 05期

关键词：

环境工程学; 电动修复; 铬渣; 土壤污染; 铬形态;

D O I：

暂无

中图分类号：

X53 [土壤污染及其防治];

学科分类号：

083001 [环境科学];

摘要：

以青岛某化工厂铬渣污染场地土壤为对象,研究了原位电动技术修复的铬去除率、迁移特征,以及电动修复前后土壤中铬形态的变化。结果表明,土壤总铬(Cr（T）)质量比为7 850 mg/kg,大部分3价铬(Cr（Ⅲ）)质量比为6 464 mg/kg。施加1 V/cm直流电压,电动修复4～6 d后,6价铬(Cr（Ⅵ）)以含氧阴离子的形式向阳极迁移,去除率在32%44%,Cr（T）的去除率在5.1%8.7%,去除效率较低,主要是因为土壤中大部分Cr（Ⅲ）以Cr（OH）3沉淀存在,在电场作用下较难发生迁移。污染土壤中的铬以有机物与硫化物结合态为主（占38.0%）,同时存在大量的残渣态铬（占54.4%）,可还原提取态铬所占比例最少（占1.5%）。电动运行后醋酸可提取态的铬比例有所降低,可还原提取态和有机物与硫化物结合态比例稍减小,对以残渣态存在的铬也几乎不产生影响。

引用

页码：56 / 60

页数：5

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