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01-09-2024 | Original Paper

Effect of Pb(II) on hydraulic behavior and microstructure evolution of activated charcoal-bentonite-reticulated red clay barrier

Authors: Yuhao Gao, Jianzhong Li, Zhongping Yang, Xuyong Li, Zhitao Wang

Published in: Bulletin of Engineering Geology and the Environment | Issue 9/2024

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Abstract

The sanitary landfill method remains the primary disposal of municipal waste in developing countries. Effective landfill barriers in intercepting pollutants are warranted to avoid soil and groundwater contamination by leachate leakage from those landfills that threaten human health. This work focuses on enhancing the capability of reticulated red clay barriers to intercept Pb(II) by incorporating activated charcoal and bentonite. The impacts of additives on the hydraulic behavior and Pb(II) blocking efficacy of composite reticulated red clay were explored through hydraulic conductivity and leachate concentration tests, respectively. The microstructural evolution of barrier materials was revealed through scanning electron microscope (SEM) and mercury intrusion porosimetry (MIP) tests. Results suggest that the formulated activated charcoal-bentonite-reticulated red clay composite barrier exhibited significantly better performance than those with the additives individually. The permeability coefficient and Pb(II) leachate concentration of the activated charcoal-bentonite-reticulated red clay barrier with 5% activated charcoal, 16% bentonite, and 79% reticulated red clay were found to be 13.20% and 23.97% of pure reticulated red clay, respectively.
The pore size distribution (PSD) curve indicates that the activated charcoal -bentonite-reticulated red clay barrier contains only nanoscale pores. In addition, the activated charcoal and bentonite in the composite barrier form a tortuous network structure that binds the clay aggregates together. This results in more intricate flow paths, enhancing adsorption and ion exchange effects, ultimately reducing hydraulic conductivity and improving the barrier’s ability to intercept contaminants.

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Literature
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Metadata
Title
Effect of Pb(II) on hydraulic behavior and microstructure evolution of activated charcoal-bentonite-reticulated red clay barrier
Authors
Yuhao Gao
Jianzhong Li
Zhongping Yang
Xuyong Li
Zhitao Wang
Publication date
01-09-2024
Publisher
Springer Berlin Heidelberg
Published in
Bulletin of Engineering Geology and the Environment / Issue 9/2024
Print ISSN: 1435-9529
Electronic ISSN: 1435-9537
DOI
https://doi.org/10.1007/s10064-024-03880-x