Enhanced electrokinetic remediation of mixed contaminants from a high buffering soil by focusing on mobility risk

The electrokinetic remediation of an agricultural soil contaminated with heavy metals was studied using organic acids as facilitating agents. The unenhanced electrokinetic treatment using deionized water as processing fluid did not show any significant mobilization and removal of heavy metals due to the low solubilization of metals and precipitation at high pH conditions close to the cathode. EDTA and citric acid 0.1 M were used as facilitating agents to favor the dissolution and transportation of metals. The organic acids were added to the catholyte and penetrated into the soil specimen by electromigration. EDTA formed negatively charged complexes. Citric acid formed neutral metal complexes in the soil pH conditions (pH = 2–4). Citric acid was much more effective in the dissolution and transportation out of the soil specimen of complexed metals. In order to enhance the removal of metals, the concentration of citric acid was increased up to 0.5 M, resulting in the removal of 78.7% of Cd, 78.6% of Co, 72.5% of Cu, 73.3% of Zn, 11.8% of Cr and 9.8% of Pb.

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Towards the application of electrokinetic remediation for nuclear site decommissioning

Journal of Hazardous Materials ◽

10.1016/j.jhazmat.2021.125274 ◽

2021 ◽

Vol 413 ◽

pp. 125274

Author(s):

Jamie M. Purkis ◽

Phil E. Warwick ◽

James Graham ◽

Shaun D. Hemming ◽

Andrew B. Cundy

Keyword(s):

Electrokinetic Remediation ◽

Nuclear Site

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Electrokinetic Remediation of Dredged Contaminated Sediments

Electrokinetic Remediation for Environmental Security and Sustainability ◽

10.1002/9781119670186.ch5 ◽

2021 ◽

pp. 99-139

Author(s):

Kristine B. Pedersen ◽

Ahmed Benamar ◽

Mohamed T. Ammami ◽

Florence Portet‐Koltalo ◽

Gunvor M. Kirkelund

Keyword(s):

Electrokinetic Remediation ◽

Contaminated Sediments

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Removal of heavy metal from soil and groundwater by in-situ electrokinetic remediation

Water Science & Technology ◽

10.2166/wst.2000.0586 ◽

2000 ◽

Vol 42 (7-8) ◽

pp. 335-343 ◽

Cited By ~ 4

Author(s):

S. Shiba ◽

S. Hino ◽

Y. Hirata ◽

T. Seno

Keyword(s):

Heavy Metals ◽

Heavy Metal ◽

Electric Potential ◽

Potential Gradient ◽

Electrokinetic Remediation ◽

Contaminated Aquifer ◽

Physico Chemical ◽

Operational Variables ◽

Mass Transport Process

The operational variables of electrokinetic remediation have not been cleared yet, because this method is relatively new and is an innovative technique in the aquifer remediation. In order to investigate the operational variables of the electrokinetic remediation, a mathematical model has been constructed based on the physico chemical mass transport process of heavy metals in pore water of contaminated aquifer. The transport of the heavy metals is driven not only by the hydraulic flow due to the injection of the purge water but also by the electromigration due to the application of the electric potential gradient. The electric potential between anode and cathode is the important operational variable for the electrokinetic remediation. From the numerical simulations with use of this model it is confirmed that the remediation starts from the up stream anode and gradually the heavy metal is transported to the down stream cathode and drawn out through the purge water.

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