Synergistic effects of electrokinetics process coupled with zero-valent iron permeable reaction barrier in remediation of arsenic-contaminated soil

JI Dongli; ZHANG Jing; MENG Fansheng; WANG Yeyao

doi:10.11949/j.issn.0438-1157.20180787

您当前的位置：

首页 >

文章列表页 >

Synergistic effects of electrokinetics process coupled with zero-valent iron permeable reaction barrier in remediation of arsenic-contaminated soil

更新时间：2025-12-10

- Synergistic effects of electrokinetics process coupled with zero-valent iron permeable reaction barrier in remediation of arsenic-contaminated soil
- CIESC Journal Issue 12, Pages: 5276-5282(2018)
- 作者机构：
  
  1. 天津城建大学环境与市政工程学院,天津,300384
  2. 天津地质调查中心,天津,300170
  3. 中国环境科学研究院环境基准与风险评估国家重点实验室水污染控制技术研究中心,北京,100012
  4. 中国环境监测总站,北京,100012
- 作者简介：
- 基金信息：
- DOI：10.11949/j.issn.0438-1157.20180787
  CLC： 53
- Online First：05 December 2018，
  
  Published：05 December 2018
- 稿件说明：
移动端阅览
JI Dongli, ZHANG Jing, MENG Fansheng, et al. Synergistic effects of electrokinetics process coupled with zero-valent iron permeable reaction barrier in remediation of arsenic-contaminated soil[J]. CIESC Journal, 2018, (12): 5276-5282.
DOI：

JI Dongli, ZHANG Jing, MENG Fansheng, et al. Synergistic effects of electrokinetics process coupled with zero-valent iron permeable reaction barrier in remediation of arsenic-contaminated soil[J]. CIESC Journal, 2018, (12): 5276-5282. DOI： 10.11949/j.issn.0438-1157.20180787.

摘要

以我国某矿区砷污染土壤为研究对象，采用EK/Fe0-PRB联合修复工艺去除土壤中的砷，考察了土壤含水率及增强试剂对砷去除的影响，分析了修复前后土壤中砷的迁移分布及砷价态分布变化，并借助X射线光电子能谱（XPS）对修复前后PRB填料Fe0进行了表征分析，探讨了EK/PRB修复砷污染的协同机制。结果表明，在EK/PRB联合修复过程中，EK去除作用所占比例为22%～43%，而PRB的去除作用所占比例为52%～71%，以PRB的去除作用为主；未添加增强试剂时，阳极液砷收集含量明显高于阴极液砷收集含量，电动去除机制主要为电迁移作用，添加增强试剂后，阴极液砷收集含量所占比例明显升高；EK/PRB修复后，As（Ⅴ）和As（Ⅲ）在土壤、电极液、PRB中的含量比例基本没有变化，As（Ⅴ）含量比例略微升高，即处理之后土壤中的五价砷并不会经氧化还原作用而转变成毒性较高的三价砷；反应后Fe0表面存在As（Ⅲ）和As（Ⅴ），未发现As（0）的存在，因此砷在PRB中仅通过铁表面氧化物的吸附作用而去除。

Abstract

The remediation of arsenic polluted soil from a mining area in China using the electrokinetics process coupled with zero-valent iron permeable reaction barrier was researched. The influence of soil moisture content and enhancement reagents on arsenic removal was investigated. The changes of distribution and valence state of arsenic before and after the remediation were analyzed. In addition

surface features of the fresh and used zero-valent iron were characterized by X-ray photoelectron spectroscopy (XPS). Then synergistic effects of EK/PRB in the remediation of arsenic-contaminated soil was discussed. The results showed that in the EK/PRB remediation process

fraction of the EK removal mechanism was 22% to 43%

while fraction of the PRB removal mechanism was 52% to 71%

so the PRB process was dominate. When the enhancement reagents was absent

arsenic mainly tends to move toward the anolyte

which indicated the mainly removal mechanisms was electromigration. However

when the enhancement reagents was added

the proportion of arsenic collected from the cathode solution was significantly increased. After EK/PRB remediation

the percentage content of As(Ⅴ) and As (Ⅲ) in soil

electrode liquid and PRB had no substantial changes

only the content ratio of As(Ⅴ) raised slightly. Pentavalent arsenic will not be reduced into trivalent arsenic with higher toxicity. There were no As(0) but As(Ⅲ) and As(Ⅴ) on the surface of the used Fe0. Therefore

arsenic was removed in PRB only through adsorption of the iron surface oxides.

关键词

Keywords

references

Views

下载量

CSCD

Alert me when the article has been cited

提交

Tools

Publicity Resources

Oxalic acid and UV enhanced arsenic leaching from coal in flue gas desulfurization by coal slurry

Effect of pH adjustment on immobilization of arsenic by coprecipitation through oxidizing Fe(Ⅱ) in acidic wastewater containing arsenic

Adsorption behavior of Fe-Mn binary oxide towards As(Ⅲ) and As(Ⅴ) and its application in biogas slurry

Mechanism of removing arsenic(Ⅲ)with ferric chloride

Hydrolysis reaction mechanism of CNCl on the surface of composite metal CuCr2O4

Related Author

LI Jintong

QIU Shun

SUN Wenshou

Shufeng YE

Peiwei HAN

Xiang LIU

Yingchao DU

Yongxia DONG

Related Institution

College of Environmental Science and Engineering, Qingdao University

State Key Laboratory of Multiphase Complex Systems, Institute of Process Engineering, Chinese Academy of Sciences

School of Chemistry and Chemical Engineering, University of Chinese Academy of Sciences

Department of Environment Engineering, School of Environment and Ecology, Xiamen University

Department of Chemical and Biochemical Engineering, School of Chemistry and Chemical Engineering, Xiamen University

⁰