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Applicability Evaluation of Electrodes Exchange and Mixed Solution for Enhanced Electrokinetic Process  

Lee, Noh-Sup (Department of Environmental Engineering, Konkuk University)
Park, Sung-Soo (Han-River Basin Environmental Office, Ministry of Environment)
NamKoong, Wan (Department of Environmental Engineering, Konkuk University)
Publication Information
Applied Chemistry for Engineering / v.18, no.4, 2007 , pp. 391-395 More about this Journal
Abstract
This study investigated the feasibility of enhanced electrokinetic (EK) remediation of soil contaminated with approximately 20000 Pb-mg/kg. Enhanced EK remediation was evaluated by using mixed solution (0.3 M acetic acid and 0.03 M EDTA, EK-M) and by exchanging electrodes for preventing precipitation of metal hydrate. For the EK-M, the lead removal efficiency was only 2% lower than the case where 0.03 M EDTA was solely used (EK-Blank, EK-B). Considering the costly expense of EDTA, the application of EK-M would be economically viable. The efficiency of of EK-E was higher by 2% than the EK-B method. More impertantly, the pH values of entire soil packed column presented to be neutral (7~8) in the EK-E process. Unlike to EK-B and EK-M, the deposition of heavy metals to any specific area was avoided in the EK-E process.
Keywords
electrokinetic process; heavy metal removal; electrode exchange; mixed flushing solution; soil remediation;
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