ORIGINAL RESEARCH
Introduction of Resin Barrier to Improve the Efficiency of Electrokinetic Remediation for Pb-Contaminated Soil
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Fei Ye 1
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1
Hebei Key Laboratory of Heavy Metal Deep-Remediation in Water and Resource Reuse, School of Environmental and Chemical Engineering, Yanshan University, Qinhuangdao 066004, China
 
2
Hebei Key Laboratory of Agroecological Safety, Hebei University of Environmental Engineering, Qinhuangdao 066102, China
 
 
Submission date: 2023-10-14
 
 
Final revision date: 2024-01-22
 
 
Acceptance date: 2024-03-24
 
 
Online publication date: 2024-07-11
 
 
Corresponding author
Shuaijie Wang   

Hebei Key Laboratory of Heavy Metal Deep-Remediation in Water and Resource Reuse, School of Environmental and Chemical Engineering, Yanshan University, China
 
 
Haiyun Qi   

Hebei Key Laboratory of Agroecological Safety, Hebei University of Environmental Engineering, Qinhuangdao 066102, China
 
 
 
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ABSTRACT
Developing an effective strategy to solve the “focus effect” of the traditional electrokinetic remediation (EKR) method during treatment of Pb-contaminated soil is challenging, but meaningful. Here, a novel permeable reactive barrier was constructed by coupling H+ modified D001 resins (H-type D001) with the electrokinetic remediation (EKR) method to achieve this goal. Owing to the existence of ion exchange between Pb2+ and H+, after introduction of H-type D001 resin into the EKR systems, the “focusing effect” was significantly weakened. To be specific, Pb2+ ions were effectively adsorbed by the resin barrier (RB) before migrating to the precipitation zone, and the adsorption of Pb2+ ions enabled H+ ions to be desorbed from the H-type D001 resins, thus improving the pH environment required for EKR. As a result, Pb2+ removal efficiency of the traditional EKR method was improved. Compared with the EKR method, the removal efficiency of Pb in soil by the RB-EKR method improved by 37.8%, relatively. Analysis on mass distribution proportion of Pb removed indicated that the majority (53.01%) of Pb was removed by RB adsorption process. This work provides a simple but effective method for modifying the traditional electrokinetic remediation system to improve remediation ability towards treating heavy metal-polluted soil.
eISSN:2083-5906
ISSN:1230-1485
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