重庆工商大学学报（自然科学版）

引用本文:	范〓敏1，袁兴中1,2,3〖KG-3〗*，李〓东1,3，吴昕达1.一种铬污染土壤的EK-Fe2+-PRB概念设计及实验(J/M/D/N,J:杂志，M：书，D：论文，N：报纸).期刊名称,2015，32（10）：6-11
	CHEN X. Adap tive slidingmode contr ol for discrete2ti me multi2inputmulti2 out put systems[ J ]. Aut omatica, 2006, 42(6): 4272-435

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一种铬污染土壤的EK-Fe2+-PRB概念设计及实验
范〓敏1，袁兴中1,2,3〖KG-3〗*，李〓东1,3，吴昕达1^1,2,3
1.重庆大学资源及环境科学学院，重庆 400044;2.重庆大学西南资源开发与环境灾害控制工程教育部重点实验室,重庆 400030;3.重庆大学煤矿灾害动力学与控制国家重点实验室，重庆 400044

摘要:

电动-可渗透反应墙（EK-PRB）技术是电动修复技术与可渗透反应墙技术的组合，可应用于铬（VI）污染土壤的修复;实验在PRB中设置一组通过变阻器相连的铁质被动电极，电动修复的外电场在被动电极中诱导出电势差，使得一个被动电极被氧化释放出Fe2+离子，另一个电解水产生OH-离子；Fe2+离子将电迁移进入PRB的Cr(VI)离子还原成Cr3+离子，而OH-离子与Cr3+离子反应生成Cr(OH)3沉淀将铬固定在PRB中;实验还通过改变两个被动电极之间的电阻，利用聚焦现象研究EK-Fe2+-PRB的拦截效果;结果表明，EK-Fe2+-PRB技术可原位产生Fe2+离子将Cr(VI)有效地还原和拦截在PRB中，且PRB中的沉淀物不能阻止Fe2+离子的释放和迁移；电压梯度阱效应引起的聚焦现象虽然可有效地将Cr(VI)富集和暂时拦截至PRB中，但其单独作用无法实现对Cr(VI)的持久拦截。

关键词: 铬污染土壤电动修复可渗透反应墙亚铁离子聚焦现象

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A Conceptual Design and Experiments of EK Fe2+ PRB for Cr contaminated Soil

FAN Min3，YUAN Xing zhong1，2，3**，LI Dong1，3，WU Xin da3

Abstract:

Electrokinetic permeable reactive barrier (EK PRB) technology is a combination of electrokinetic remediation (EKR) technology and permeable reactive barrier (PRB) technology which can be applied in Cr contaminated soil remediation.In this research，a set of passive electrodes connnected through a variable resistor is installed in the PRB.The electric field of EKR induces a potential difference between two passive electrodes，which causes oxidation of one iron passive electrode releasing Fe2+ ions and water electrolysis at another iron passive electrode releasing OH ions.Cr(VI) ions migrated into PRB by eletromigration are reduced into Cr3+ ions by Fe2+ ions，which are further precipitated in PRB by reaction with OH ions forming Cr(OH)3.Focusing phenomenon is also used to study the trapping effect of EK Fe2+ PRB by adjusting the value of variable resistor.Results show that EK Fe2+ PRB can produce Fe2+ ions in situ and effectively reduce and trap Cr(VI) ions in the PRB.Focuing phenomenon caused by potential gradient can effectively enrich Cr(VI) ions and delay its migration in PRB，but the delay is just temporarily.

Key words: chromium contaminated soil electrokinetic remediation permeable reactive barrier ferrous irons focusing phenomenon