Treatment of Pb-contaminated soil by electrokinetics: Enhancements by varying voltage, chelant, and electrode material

Taneja, Sonam; Karaca, Öznur; Haritash, A. K.

doi:10.1016/j.gexplo.2023.107240

Cited by 8 publications

(6 citation statements)

References 40 publications

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“…Electrical current serves as an important indicator for assessing the movement of ions within soil pores [ 4 ]. All ECT experiments displayed a characteristic pattern of initially increasing and then decreasing electrical current.…”

Section: Resultsmentioning

confidence: 99%

“…This was because the electroosmotic flow showed a reversal during the ECT process [ 47 ]. Based on the current trends, it could be inferred that the soil surface potential changed from negative to positive, which further contributed to the reversal of the electroosmotic flow under higher applied voltage [ 4 , 48 ]. Additionally, the intermittent interruption of the electric current during this period led to the cessation of electroosmotic flow.…”

Section: Resultsmentioning

confidence: 99%

“…The conductivity of the soil was influenced by the presence of conductive ions. The addition of acetic acid as the catholyte neutralizes hydroxide ions in the soil through diffusion, promoting the desorption of soluble ions that were adsorbed on the soil surface [ 4 , 40 , 52 ]. These ions then migrate to different soil areas under the influence of the electric field, resulting in a decrease in conductive ions in the soil.…”

Section: Resultsmentioning

confidence: 99%

“…The accumulation of lead (Pb) contaminants on both the surface and within the soil matrix represents a significant threat to human health and the natural soil ecosystem [ 1 ]. Extensive research efforts have been devoted to addressing the remediation of soil contaminated with lead using physical, chemical, and biological approaches [ 2 , 3 , 4 , 5 ]. Nevertheless, these conventional techniques often entail prolonged operation, high energy consumption and significant labor.…”

Section: Introductionmentioning

confidence: 99%

“…Recently, ECT technology has achieved successful implementation at both laboratory and pilot scales for the removal of heavy metals from soil [ 7 ]. ECT technology is founded on three fundamental processes: electroosmosis, electromigration, and electrophoresis [ 4 ]. Upon the insertion of electrodes into the soil, an electric field is generated, which imparts energy to charged metal ions, compelling them to migrate in the opposite direction of their inherent charge, a phenomenon referred to as electromigration [ 8 ].…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

Removal of Pb from Contaminated Kaolin by Pulsed Electrochemical Treatment Coupled with a Permeable Reactive Barrier: Tuning Removal Efficiency and Energy Consumption

Zhang,

Zang,

Zhao

et al. 2023

Toxics

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Lead contamination in soil has emerged as a significant environmental concern. Recently, pulse electrochemical treatment (PECT) has garnered substantial attention as an effective method for mitigating lead ions in low-permeability soils. However, the impact of varying pulse time gradients, ranging from seconds to hours, under the same pulse duty cycle on lead removal efficiency (LRE) and energy consumption in PECT has not been thoroughly investigated. In this study, a novel, modified PECT method is proposed, which couples PECT with a permeable reaction barrier (PRB) and adds acetic acid to the catholyte. A comprehensive analysis of LRE and energy consumption is conducted by transforming pulse time. The results show that the LREs achieved in these experiments were as follows: PCb-3 s (89.5%), PCb-1 m (91%), PCb-30 m (92.9%), and PCb-6 h (91.9%). Importantly, these experiments resulted in significant reductions in energy consumption, with decreases of 68.5%, 64.9%, 51.8%, and 47.4% compared to constant voltage treatments, respectively. It was observed that LRE improved with an increase in both pulse duration and voltage gradient, albeit with a corresponding rise in energy consumption. The results also revealed that corn straw biochar as a PRB could enhance LRE by 6.1% while adsorbing migrating lead ions. Taken together, the present data highlights the potential of modified PECT technology for remediation of lead-contaminated soil, which provides an optimal approach to achieve high LRE while minimizing energy consumption.

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Section: Resultsmentioning

confidence: 99%