微电流对零价铁还原Cr(Ⅵ)过程中去钝化作用研究

万龙; 孟凡生; 杨琦; 王业耀

doi:10.3969/j.issn.1674-991X.2018.04.056

微电流对零价铁还原Cr(Ⅵ)过程中去钝化作用研究

doi: 10.3969/j.issn.1674-991X.2018.04.056

万龙^1,2,,
孟凡生^1,,
杨琦²,
王业耀³

^1. 中国环境科学研究院水污染控制技术研究中心,北京 100012
^2. 中国地质大学(北京)水资源与环境学院,北京 100083
^3. 中国环境监测总站,北京 100012

详细信息

作者简介:
万龙(1991—),男,硕士研究生,研究方向为水污染控制技术, 1076206242@qq.com

中图分类号: X703
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出版历程
- 收稿日期: 2018-03-15
- 刊出日期: 2018-07-20

Depassivation of micro current in hexavalent chromium reduction by zero valent iron

^1. Research Center of Water Pollution Control Technology, Chinese Research Academy of Environmental Sciences, Beijing 100012, China
^2. School of Water Resources and Environment, China University of Geosciences, Beijing 100083, China
^3. China National Environmental Monitoring Centre, Beijing 100012, China

摘要

摘要: 为解决零价铁(ZVI)作为渗透反应格栅(PRB)反应介质处理六价铬〔Cr(Ⅵ)〕时产生钝化导致处理效率低的问题,提出了在反应介质上施加低直流电压,产生微电流去钝化的措施。通过PRB柱流动模拟试验,以粒径为0.15~0.35 mm的工业铁粉为反应介质,施加不同低电压,分析ZVI去除Cr(Ⅵ)的效果。结果表明:当Cr(Ⅵ)去除率达到60%时,施加1、3、7 V电压的试验组对应的出水体积分别是对照组的1.42、1.88和2.75倍;微电流可以在一定程度上解决ZVI的钝化问题,提高ZVI的利用效率,施加电压增大,ZVI的利用效率逐渐增高;施加电压产生的微电流对Cr(Ⅲ)沉淀影响不大,会对Fe(Ⅱ)或Fe(Ⅲ)的沉淀物产生影响。
- 零价铁 /
- Cr(Ⅵ); /
- 渗透反应格栅 /
- 微电流 /
- 去钝化
Abstract: In order to overcome the low removal efficiency for hexavalent chromium(Cr(Ⅵ)) due to the passivation when zero valent iron(ZVI) is used as permeable reactive barriers(PRB) reactive media, the micro current depassivation advanced method was proposed by loading low-DC voltage on the reactive media. In the PRB column flow simulation test, the industrial scrap ZVI powder(0.15-0.35 mm) was used as reactive media, the different micro voltage was loaded on ZVI, and thus the Cr(Ⅵ) removal performance and mechanism were investigated. The results showed that the micro current could solve the ZVI passivation to some extent and enhance the utilization efficiency of ZVI. When Cr(Ⅵ) removal efficiency reached 60%, the effluent volume of the experimental groups with 1 V, 3 V, 7 V loaded on ZVI were 1.42, 1.88, and 2.75 times as many as that of the control group unloaded voltage, respectively. Cr(Ⅵ) removal efficiency was increased with the increase of voltage loaded on ZVI. The micro current could not affect the precipitation of trivalent chromium significantly, but it can influence the precipitation of ferrous or ferric iron.
- zero valent iron /
- hexavalent chromium /
- permeable reactive barriers /
- micro current /
- depassivation

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