Use of Chelating Agents in Electrochemical Remediation of Contaminated Soil

Yeung, Albert T.; Gu, Yingying

doi:10.1061/9780784412183.ch09

Cited by 12 publications

(2 citation statements)

References 211 publications

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“…It was reported that, lowering soil pH with HCl may increase the leaching potential of metals and Cl -to groundwater and the formation of some insoluble salts (i.e., PbCl 2 ; Yeung and Gu 2011). Weak acid such as citric acid and acetic acid are environmental friendly and biodegradable, while their effect on lowering soil pH is not as effective as strong acid (Yeung and Gu 2012). As supported by the present study, EKF seemed an effective technique to lower soil pH (Puppala et al 1997).…”

Section: Effect Of the Electrokinetic Field (Ekf) On Soil Phssupporting

confidence: 58%

The distribution and elevated solubility of lead, arsenic and cesium in contaminated paddy soil enhanced with the electrokinetic field

Mao

Han

Shao

et al. 2016

Int. J. Environ. Sci. Technol.

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The objectives of this study were to investigate fractionation, solubility and potential bioavailability of Pb, As and Cs in Mississippi River Delta paddy soil under an electrokinetic field (EKF). Effects of EKF on soil pH changes and solid-phase distributions of metal(loid)s were examined. Results showed that fractionation of Pb, As and Cs was largely determined by the nature of elements, loading levels and EKF treatment. Native Pb in the soil was mostly in the amorphous iron oxide, organic matter and residual fractions, native As in the amorphous iron oxide, easily reducible oxide and residue fractions while native Cs in the residue fraction. Added Pb, As and Cs showed distinguished solid-phase distributions: Pb dominantly in the organic matter fraction; As in the amorphous iron oxide fraction, and Cs in the residue with a significant watersoluble plus exchangeable fraction. EKF treatment is effective on lowering soil pH to 1.5 near the anode due to water electrolysis releasing proton which is beneficial for dissolution of metal(loid)s, increasing their overall solubility. The acidification in the anode soil efficiently increased the water-soluble Pb and the exchangeable Cs, implying enhanced solubility and elevated their overall potential bioavailability in the anode region while lower solubility in the cathode area. The building up of watersoluble As in the anode region may be from electromigration of As anion from the cathode. This study shows significant enhancement of redistribution, elevated solubility and overall bioavailability of Pb, As and Cs in Mississippi Delta paddy soil under the EKF.

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Section: Effect Of the Electrokinetic Field (Ekf) On Soil Phssupporting

confidence: 58%

The distribution and elevated solubility of lead, arsenic and cesium in contaminated paddy soil enhanced with the electrokinetic field

Mao

Han

Shao

et al. 2016

Int. J. Environ. Sci. Technol.

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“…Electrokinetics provides an efficient approach to enhance the interaction among bacteria, contaminants, and bacterial nutrients and electron acceptors under in situ conditions [4][5][6]. During electrokinetic process, a dc electric field is imposed upon the contaminated soil to transport contaminants, bacteria, nutrients, etc., through the soil matrix by mechanisms of electroosmosis, electromigration, and/or electrophoresis [7,8].…”

Section: Introductionmentioning

confidence: 99%

Preliminary Study on Bio-Electrokinetic Remediation of Saturated Oil-Contaminated Soil

Xing

Shi

et al. 2014

AMR

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Bio-electrokinetic remediation of oil-contaminated soil is a promising technology. In this study, three bio-electrokinetic remediation experiments were carried out to study the effects of external addition of oil-degrading bacteria by electrokinetics and different operational parameters on oil decontamination in saturated soil. Results showed that oil in soil migrated from the anode towards the cathode with forward electroosmotic flow and accumulated near the cathode. Oil was barely degraded without external addition of oil-degrading bacteria. Although electrolytes were refreshed every 12 hr, soil pH varied greatly at the electrodes under unidirectional operation. When electrode polarity was reversed every 2 hr, soil pH was efficiently controlled within the range of 6.35-9.75. The relative oil concentrations after the bidirectional experiment were in the range of 0.81-0.84 after 20 days of treatment. The relatively low oil degradation rate may be due to the facultative aerobic environment in the saturated soil matrix.

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Electrokinetic Remediation Technique: An Integrated Approach to Finding New Strategies for Restoration of Saline Soil and to Control Seawater Intrusion

2014

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Many applications of electrokinetic remediation have focused on the removal of heavy metals. However, the application of electrokinetic technology in salt removal from contaminated soils and groundwater has not been extensively explored. Given the current global challenge and the impact of soil and groundwater salinity, it is tempting to suggest that the research community should apply this technology to generate in‐depth knowledge for determining the feasibility and efficiency of electrokinetic remediation in salt removal, particularly in addressing seawater intrusion in coastal aquifers, which is creating growing challenges in the freshwater supply, mainly in coastal and arid regions, in view of growing populations, economic and industrial growth, and climate change. This Review shows that there is a need to begin formulating a knowledge base about categories of materials, efficiencies, and limitations. Furthermore, the viability of this technology in the real field suggests a need to gain more insight into electrokinetic applications in this area. The versatility of electrokinetic remediation in different settings is demonstrated in this Review, as is its capability to address diverse remediation challenges. The available literature is critically assessed; novel and improved electrokinetic remediation and the important trends in this field are outlined. The Review aims to summarize the evolution and current status of electrokinetic remediation research with a view of starting a debate around the possibility of applying it as a pretreatment mechanism to control seawater intrusion.

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Use of Chelating Agents in Electrochemical Remediation of Contaminated Soil

Cited by 12 publications

References 211 publications

The distribution and elevated solubility of lead, arsenic and cesium in contaminated paddy soil enhanced with the electrokinetic field

The distribution and elevated solubility of lead, arsenic and cesium in contaminated paddy soil enhanced with the electrokinetic field

Preliminary Study on Bio-Electrokinetic Remediation of Saturated Oil-Contaminated Soil

Electrokinetic Remediation Technique: An Integrated Approach to Finding New Strategies for Restoration of Saline Soil and to Control Seawater Intrusion

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