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Treatment of Liquid Waste Containing Highly Concentrated Ethylenediaminetetraaceticacid by Using Underwater Electrical Discharge  

Jo, Jin-Oh (Department of Chemical and Biological Engineering, Cheju National University)
Mok, Young-Sun (Department of Chemical and Biological Engineering, Cheju National University)
Kang, Duk-Won (Korea Electric Power Research Institute)
Publication Information
Journal of Korean Society of Environmental Engineers / v.29, no.5, 2007 , pp. 564-570 More about this Journal
Abstract
This study investigated the treatment of liquid waste containing highly concentrated iron(III)-ethylenediaminetetraaceticacid (Fe(III)-EDTA) of 70,000 mg/L by an underwater electrical discharge process using low voltage and high current. When AC voltage is applied to the discharging electrode with the other electrode grounded, the temperature of the liquid waste around the discharging electrode rapidly increases, and at the same time, hydrogen and oxygen gases are formed at the electrode as a result of electrochemical reactions. Ultimately, gases formed by vaporization of water and electrochemical reactions cover the electrode. Since the liquid waste is electrically conductive, it elongates the ground electrode up to the border of the gas layer, where electrical discharge occurs. Without hydrogen peroxide, electrical discharge was able to remove about 50% of Fe(III)-EDTA. As the concentration of hydrogen peroxide added increased, the removal efficiency of Fe(III)-EDTA increased. When the molar ratio of hydrogen peroxide to the initial Fe(III)-EDTA was higher than 24.7, more than 80 g of Fe(III)-EDTA was removed with an energy of 1 kWh. A comparison between tungsten and steel electrodes showed that electrode material did not affect the Fe(III)-EDTA removal. In the present underwater electrical discharge process, the removal of Fe(III)-EDTA was completed within 30 min at molar ratios of hydrogen peroxide to the initial Fe(III)-EDTA higher than 24.7.
Keywords
Underwater Electrical Discharge; Liquid Waste; Fe(III)-EDTA; Hydrogen Peroxide;
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Times Cited By KSCI : 1  (Citation Analysis)
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