Pedosphere (3): 526--533, 2025
ISSN 1002-0160/CN 32-1315/P
©2025 Soil Science Society of China
Published by Elsevier B.V. and Science Press
| Remediation of a Pb and Cd-contaminated clayey soil via magnetic-enhanced washing |
Dahu RUI1,2, Yuru WANG1,2 , Wenjun NIE1, Mintae KIM3, Jun ZHANG1, Shuren WANG1, Yuzuru ITO4, Fujun NIU2 |
1 International Joint Research Laboratory of Henan Province for Underground Space Development and Disaster Prevention, Henan Polytechnic University, Jiaozuo 454003 (China);
2 State Key Laboratory of Frozen Soil Engineering, Northwest Institute of Eco-Environment and Resources, Chinese Academy of Sciences, Lanzhou 730000 (China);
3 School of Civil, Environmental, and Architectural Engineering, Korea University, Seoul 02841 (Korea);
4 Department of Civil and Environmental Engineering, Setsunan University, Osaka 5728508 (Japan) |
| ABSTRACT |
| The contact between contaminant and washing solution is a fundamental factor that limits the contaminant removal efficiency of chemical washing. In this study, the magnetization technique was employed to improve the physicochemical properties of ethylene diamine tetraacetic acid (EDTA) solutions for the removal of lead (Pb) and cadmium (Cd) from a contaminated clayey soil. Furthermore, EDTA concentration, magnetization strength, and magnetization time were varied as parameters for enhancing the contact between contaminant and washing solution to improve remediation efficiency. The results showed that after magnetization, the viscosities, surface tensions, and contact angles of EDTA solutions decreased, whereas the electrical conductivity and pH increased. In particular, the viscosities of high-concentration EDTA solutions increased with increasing magnetic field strength and magnetization time. The magnetized EDTA solutions increased the maximum removal rates of Cd and Pb by 64.46% and 35.49%, respectively, compared to the unmagnetized EDTA solutions. The results highlighted the efficient metal removal by magnetized washing solutions due to the better contact between the washing solutions and the contaminants. The magnetic-enhanced soil washing method was proven to be efficient, cost-effective, and easily implementable for enhancing heavy metal removal. This study provides a valuable reference for improving the efficiency of chemical washing for heavy metal-contaminated clayey soils. |
| Key Words: chemical washing|contact angle|heavy metal|remediation efficiency|soil remediation|surface tension|viscosity|wettability |
| Citation: Rui D H, Wang Y R, Nie W J, Kim M, Zhang J, Wang S R, Ito Y, Niu F J. 2025. Remediation of a Pb and Cd-contaminated clayey soil via magnetic-enhanced washing. Pedosphere. 35(3): 526-533. |
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