Mechanical properties evolution and microscopic mechanisms of arsenic and cadmium co-contaminated clayey soils
文献类型：期刊论文
| 作者 | Feng, Chen1,2,3; Li, Jiangshan2,3,4; Liu, Jindu1,2,3; Chen, Zhen2,4; Jiang, Wenhao1,2,3; Huang, Xiao2,3; Xue, Qiang2,3
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| 刊名 | BULLETIN OF ENGINEERING GEOLOGY AND THE ENVIRONMENT
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| 出版日期 | 2023-06-01 |
| 卷号 | 82期号:6页码:- |
| ISSN号 | 1435-9529 |
| 关键词 | Heavy metals Co-contamination Interaction mechanism Permeability Shear strength Counteracting effect |
| 英文摘要 | Understanding the interaction mechanism between different heavy metals and soils is a primary and important task for remediation of contaminated soils. In this study, we conducted series experiments to explore the co-contamination mechanism of arsenic (As) and cadmium (Cd) on clayey soils. The results showed that As and Cd exhibited opposite effects on physical and mechanical properties of soils under single contamination, while producing a counteracting effect under co-contamination. Specific adsorption, electrostatic adsorption, and precipitation adsorption co-existed simultaneously in As- and Cd-co-contaminated soils, and precipitates found by XRD is the main cause of the counteraction of As and Cd in co-contaminated soils. The shear strength and permeability coefficient of single As-contaminated soils were decreased by 23.02 kPa and 0.61 x 10(-6) cm/s at a concentration of 5000 mg/kg, respectively, and soil particles were dispersed into small aggregates with more ultramicropores (0.1-5 mu m) and cryptopores (< 0.1 mu m). However, for single Cd contaminated soils, the shear strengths were increased by 27.93% on average, the maximum permeability coefficient increased to 6.63 x 10(-6) cm/s, and soil aggregations were enlarged with more micropores (5-30 mu m). Furthermore, for co-contaminated soils with As and Cd, the shear strength and permeability coefficient were between those of single As- and Cd-contaminated soils at the same concentration, and decreased with an increasing concentration of As. This study provides significant experiment and theory support for remediation and reclamation of heavy metal co-contaminated soils with different charges. |
| 学科主题 | Engineering ; Geology |
| 语种 | 英语 |
| 出版者 | SPRINGER HEIDELBERG |
| WOS记录号 | WOS:000995996700001 |
| 源URL | [http://119.78.100.198/handle/2S6PX9GI/35146]  |
| 专题 | 中科院武汉岩土力学所 |
| 作者单位 | 1.University of Chinese Academy of Sciences, Beijing 100000, China 2.State Key Laboratory of Geomechanics and Geotechnical Engineering, Institute of Rock and Soil Mechanics, Chinese Academy of Sciences, Wuhan 430071, China 3.Hubei Province Key Laboratory of Contaminated Sludge and Soil Science and Engineering, Wuhan 430071, China 4.IRSM-CAS/HK PolyU Joint Laboratory On Solid Waste Science, Wuhan 430071, China |
| 推荐引用方式 GB/T 7714 | Feng, Chen,Li, Jiangshan,Liu, Jindu,et al. Mechanical properties evolution and microscopic mechanisms of arsenic and cadmium co-contaminated clayey soils[J]. BULLETIN OF ENGINEERING GEOLOGY AND THE ENVIRONMENT,2023,82(6):-. |
| APA | Feng, Chen.,Li, Jiangshan.,Liu, Jindu.,Chen, Zhen.,Jiang, Wenhao.,...&Xue, Qiang.(2023).Mechanical properties evolution and microscopic mechanisms of arsenic and cadmium co-contaminated clayey soils.BULLETIN OF ENGINEERING GEOLOGY AND THE ENVIRONMENT,82(6),-. |
| MLA | Feng, Chen,et al."Mechanical properties evolution and microscopic mechanisms of arsenic and cadmium co-contaminated clayey soils".BULLETIN OF ENGINEERING GEOLOGY AND THE ENVIRONMENT 82.6(2023):-. |
入库方式： OAI收割
来源：武汉岩土力学研究所
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