Evaluation of Electrolyte and Electrode Spacing for Application of Electrokinetic Remediation

Electrokinetic remediation (EKR) is the most efficient technique for remediation of fine-grained soil. The primary removal mechanisms of heavy metal in EKR are the electromigration and electroosmosis flow under appropriate electric gradients. Most EKR studies have researched the variation according to the electrolyte and electric voltage. Also, EKR could be influenced by the migration velocity of ions, while few studies have investigated the effect of moisture content. In this study, soil moisture was controlled by using tap water and NaOH as electrolytes to enhance electromigration and electroosmosis flow. In both electrolytes, the higher moisture content led to the more As removal efficiency, but there were no differences between tap water and NaOH. Therefore, tap water was the most cost-effective electrolyte to remove As from fine-grained soil.

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Soil moisture could enhance electrokinetic remediation of arsenic-contaminated soil

Shin

Park

Baek

2017

Environ Sci Pollut Res

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Applicability of Soil Washing with Neutral Phosphate for Remediation of Arsenic-contaminated Soil at the Former Janghang Smelter Site

Im¹,

Kim

Yang³

et al. 2014

Journal of Soil and Groundwater Environment

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In accordance with the view on remediated soil as a resource, this study assessed the applicability of soil washing with the neutral phosphate for remediation of arsenic (As)-contaminated soil. Three soil samples of different land uses (i.e., rice paddy, upland field and forest land) were collected from the study site, and the aqua regia-extractable As concentrations were 59.2, 30.8 and 53.1 mg/kg, respectively. Among the neutral phosphate reagents, ammonium phosphate showed the highest As washing efficiency. The optimized washing condition was 2-hr washing with 0.5 M ammonium phosphate solution (pH 6) and soil to liquid ratio of 1 : 5. The extraction efficiencies of As did not guarantee the residual soil As concentrations to satisfy the Korea soil regulatory level (i.e., Worrisome level) in the three soil samples. To enhance washing efficiency, the As-contaminated soil was submerged in washing solution (1 : 1, w/v) for 24 hr and 1-hr washing with 0.5 M ammonium phosphate solution was tested. As extraction efficiencies of 36.1 (rice paddy), 21.4 (upland field) and 26.4% (forest land) were attained, which satisfied the Worrisome level for Region 1 (25 mg/kg of As) in rice paddy, but not in upland field and forest land.

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Evaluation of Electrolyte and Electrode Spacing for Application of Electrokinetic Remediation

Cited by 2 publications

References 28 publications

Soil moisture could enhance electrokinetic remediation of arsenic-contaminated soil

Soil moisture could enhance electrokinetic remediation of arsenic-contaminated soil

Applicability of Soil Washing with Neutral Phosphate for Remediation of Arsenic-contaminated Soil at the Former Janghang Smelter Site

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