复合冻融与淋洗方法修复重金属污染黏性土的研究

芮大虎; 武迎飞; 陈雪; 杨健辉; 伊藤譲

doi:10.11779/CJGE201902006

复合冻融与淋洗方法修复重金属污染黏性土的研究 English Version

芮大虎^{1, 2, 3, ,},
武迎飞¹,
陈雪⁴,
杨健辉^{1, 2},
伊藤譲⁵

1. 河南理工大学土木工程学院,河南焦作454000;
2. 生态建筑与环境构建河南省工程实验室,河南焦作454000;
3. 中国科学院寒旱所冻土工程国家重点实验室,甘肃兰州730000;
4. 河南省地质矿产勘查开发局第二地质矿产调查院,河南郑州450001;
5. 摄南大学都市环境工学科,日本大阪572-8508

基金项目: 国家自然科学基金项目（41371092）; 中国科学院寒旱所冻土工程国家重点实验室开放基金项目（SKLFSE201402); 河南省教育厅基础研究计划项目（14B170007）

详细信息

作者简介:
芮大虎(1969- ),男,博士,副教授,主要从事冻土环境及地下工程等方面的教学和科研。E-mail: dhrui@hpu.edu.cn。

通讯作者:
芮大虎，E-mail：dhrui@hpu.edu.cn

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出版历程
- 收稿日期: 2017-12-25
- 发布日期: 2019-02-24

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

RUI Da-hu^{1, 2, 3, ,},
WU Ying-fei¹,
CHEN Xue⁴,
YANG Jian-hui^{1, 2},
ITO Yzuru⁵

1. School of Civil Engineering, Henan Polytechnic University, Jiaozuo 454000, China;
2. Henan Province Engineering Laboratory for Eco-architecture and Built Environment, Jiaozuo 454000, China;
3. State Key Laboratory of Frozen Soil Engineering, Lanzhou 730000, China;
4. No. 2 Institute of Geological &Mineral Resources Survey of Henan, Zhengzhou 450001, China;;
5. Department of Civil Engineering, Setsunan University, Osaka 5728508, Japan

摘要

摘要: 土壤淋洗被认为是一种高效、可广泛应用和彻底治理重金属土壤污染的方法,但因黏质土壤的低渗透性、较大颗粒比表面积对重金属离子所具有的强烈吸附作用,影响水或淋洗剂在土壤中的混合传质,导致淋洗效果不佳。利用人工冻结方法,通过未冻土侧水分向冻结锋面迁移和冻融循环重构土粒结构提高渗透性的原理,再结合化学淋洗方法,对铅、镉污染的黏性土壤进行了修复试验。结果表明,土体经反复冻融后会破坏土体颗粒原有结构,从而有助于淋洗液与污染物充分接触,因而提高了淋洗效率,为利用自然冷能对季冻区重金属污染土壤修复提供了思路。
- 冻融循环 /
- 黏性土壤 /
- 重金属污染 /
- 淋洗剂 /
- 土壤修复
Abstract: 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.
- freeze-thaw cycle /
- clayey soil /
- heavy metal pollution /
- washing agent /
- soil remediation

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参考文献(27)

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