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Remediation of Cd- and Pb- contaminated clay soils through combined freeze-thaw and soil washing.

Authors
  • Rui, Dahu1
  • Wu, Zhipeng2
  • Ji, Mingchng2
  • Liu, Jianfei2
  • Wang, Shuren3
  • Ito, Yuzuru4
  • 1 International Joint Research Laboratory of Henan Province for Underground Space Development and Disaster Prevention, Henan Polytechnic University, Jiaozuo 454003, China; State Key Laboratory of Frozen Soil Engineering, Cold and Arid Regions Environmental and Engineering Research Institute, Chinese Academy of Sciences, Lanzhou 730000, China. , (China)
  • 2 International Joint Research Laboratory of Henan Province for Underground Space Development and Disaster Prevention, Henan Polytechnic University, Jiaozuo 454003, China. , (China)
  • 3 International Joint Research Laboratory of Henan Province for Underground Space Development and Disaster Prevention, Henan Polytechnic University, Jiaozuo 454003, China. Electronic address: [email protected] , (China)
  • 4 Department of Civil and Environmental Engineering, Setsunan University, Osaka 5728508, Japan. , (Japan)
Type
Published Article
Journal
Journal of hazardous materials
Publication Date
May 05, 2019
Volume
369
Pages
87–95
Identifiers
DOI: 10.1016/j.jhazmat.2019.02.038
PMID: 30772691
Source
Medline
Keywords
Language
English
License
Unknown

Abstract

To improve the washing efficiency for low-permeability clay, the method of freeze-thaw synergistic chemical washing was put forward to study the cadmium (Cd)-and lead (Pb)- real-site contaminated soils as the research object and ethylene diaminete traacetic acid (EDTA) was selected as the eluent to conduct a soil column washing test of heavy metal-contaminated clay soil. Results show that repeated freeze-thaw of soil can destroy the original structure of soil particles, help the eluent fully interact with pollutants, and thus improve washing efficiency. Cd was showed the best removal effect after supplying 0.1 mol/L EDTA twice and deionized water thrice by freeze-thaw and washing, and the removal rate reached 88.07%. Pb was also showed the better removal effect after three times of 0.1 mol/L EDTA and four times of deionized water through freeze-thaw and washing, and the removal rate reached 37.78%. Combined freeze-thaw and chemical washing can effectively remove the reducible and residual fractions of Cd and Pb in the clay soils. Moreover, freeze-thaw synergistic chemical washing can remove Cd and Pb at low liquid/soil ratios. The conclusions obtained in the study are of important theoretical value and technical support for the similar engineering. Copyright © 2019 Elsevier B.V. All rights reserved.

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