Remediation of heavily metal-contaminated clayey soils by composite freeze-thaw and soil washing method

被引：0

作者：

Rui D.-H. ^{[1
,2
,3
]}

Wu Y.-F. ^{[1
]}

Chen X. ^{[4
]}

Yang J.-H. ^{[1
,2
]}

Ito Y. ^{[5
]}

机构：

[1] School of Civil Engineering, Henan Polytechnic University, Jiaozuo

[2] Henan Province Engineering Laboratory for Eco-architecture and Built Environment, Jiaozuo

[3] State Key Laboratory of Frozen Soil Engineering, Lanzhou

[4] No. 2 Institute of Geological & Mineral Resources Survey of Henan, Zhengzhou

[5] Department of Civil Engineering, Setsunan University, Osaka

来源：

Yantu Gongcheng Xuebao/Chinese Journal of Geotechnical Engineering | 2019年 / 41卷 / 02期

关键词：

Clayey soil; Freeze-thaw cycle; Heavy metal pollution; Soil remediation; Washing agent;

D O I：

10.11779/CJGE201902006

中图分类号：

学科分类号：

摘要：

Soil washing is considered as an efficient and widely applicable technology for the thorough treatment of heavy metal pollution in soils. However, due to the low permeability of clayey soils, the large particle specific surface area strongly adsorbs ions, affecting the mixing and mass transfer of water or washing agent in the soils, thus reducing the washing efficiency. Using the artificial freezing method, and adopting the principles of the unfrozen soil moisture migrating to freezing front side and the freeze-thaw cycle for improving permeability combined with the chemical leaching method, remediation experiments on clayey soils contaminated with lead and cadmium are carried out. The results show that the soils after repeated freeze-thaw will destroy the original structure of soil particles, which will help the full contact with the washing agent and contaminants, thus improving the efficiency of the washing, which provides a good idea for using natural cool energy to repair heavily metal-contaminated seasonal frozen soils. © 2019, Editorial Office of Chinese Journal of Geotechnical Engineering. All right reserved.

引用

页码：286 / 293

页数：7

共 27 条

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