| Fe0-PRB去除Cr(Ⅵ)反应动力学及影响机制 |
| 摘要点击 3144 全文点击 1212 投稿时间：2016-01-22 修订日期：2016-04-28 |
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| 中文关键词 零价铁渗透式反应墙(Fe0-PRB) Cr(Ⅵ) 影响机制 反应动力学 地下水化学条件 |
| 英文关键词 Fe0-PRB Cr(Ⅵ) impacting mechanism reaction kinetics groundwater chemical conditions |
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| 中文摘要 |
| 零价铁渗透式反应墙技术（zero-valent iron permeable reactive barrier,Fe0-PRB）是近年来兴起的一项高效经济的地下水原位修复技术，被成功应用于地下水Cr（Ⅵ）污染的场地修复中.针对Fe0-PRB去除Cr（Ⅵ）的反应影响机制开展研究，从动力学角度揭示零价铁去除Cr（Ⅵ）的环境条件响应规律，获得描述零价铁去除Cr（Ⅵ）的反应动力学模型.考察了地下水常见离子对Cr（Ⅵ）去除的影响，发现地下水中氯离子通过影响电子传递影响Cr（Ⅵ）去除，硫酸根、镁离子通过参与反应影响Cr（Ⅵ）去除，碳酸氢根通过参与反应和影响电子传递共同影响Cr（Ⅵ）去除，钙离子对Cr（Ⅵ）去除影响不大.研究结果为Fe0-PRB去除Cr（Ⅵ）的工艺参数优化提供方法和理论依据. |
| 英文摘要 |
| Zero-Valent Iron Permeable Reactive Barrier (Fe0-PRB) is a competitive and economical in-situ groundwater remediation technology in recent years, and high removal efficiencies of Cr(Ⅵ)-polluted groundwater have been realized. The present study focused on the impacting mechanism of Cr(Ⅵ) removal by Fe0-PRB. Environmental condition response was revealed from kinetic view, and kinetic expression describing the removal process was determined. In addition, the effect of groundwater chemical conditions was studied. It was found that calcium had little effect on Cr(Ⅵ) removal. Chloride might influence Cr(Ⅵ) removal through impacting electron transfer, and sulfate/magnesium might influence Cr(Ⅵ) removal through participating in reactions. Bicarbonate might influence Cr(Ⅵ) removal through combined effects of impacting electron transfer and participating in reactions. The results provide method and theory basis for process parameter optimization in Fe0-PRB systems. |
