Influence of Electrochemical Remediation on the Hydraulic and Mechanical Behavior of a Metal-Contaminated Clayey Soil
Publication: Geo-Congress 2022
ABSTRACT
Electrochemical techniques for remediating metal-contaminated fine-grained soils of low-hydraulic conductivity (in the order 10–5–10–9 m/s) have received increased attention over the last decade. However, the influence of electrochemical methods on the mechanical and hydraulic properties of treated soils is not fully understood. This laboratory study adopted the modified Fenton’s reagent using hydrogen peroxide (H2O2) and a citrate buffer (Na3C6H5O7) solution to remediate a low-plasticity clay from Rock Falls, IL. The soil was initially contaminated with 726 mg/kg manganese (Mn) and 7.9 mg/kg arsenic (As). Following a 28-day treatment period using a custom-made high-density polyethylene (HDPE) reactor, approximately 23% and 9% extraction efficiencies for Mn and As, respectively, were achieved. The post-treatment geotechnical tests including plasticity (1% reduction on average), unconfined compressive strength (6% reduction on average), and water retention analysis indicated a moderate correlation between the metal concentrations in the soil and the corresponding hydraulic and mechanical behavior of the soil.
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Geo-Congress 2022
Pages: 129 - 139
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Published online: Mar 17, 2022
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