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Role of Electrode Reaction of Electrolyte in Electrokinetic-Fenton Process for Phenanthrene Removal  

Park Ji-Yeon (Korea Institute of Energy Research)
Kim Sang-Joon (Department of Chemical & Biomolecular Engineering, KAIST)
Lee You-Jin (Department of Chemical & Biomolecular Engineering, KAIST)
Yang Ji-Won (Department of Chemical & Biomolecular Engineering, KAIST)
Publication Information
Journal of Soil and Groundwater Environment / v.11, no.1, 2006 , pp. 7-13 More about this Journal
Abstract
The effects of electrolytes were investigated on the removal efficiency when several different electrolytes were used to change the electrode reaction in an electrokinetic (EK)-Fenton process to remediate phenanthrene-contaminated soil. Electrical potential gradient decreased initially due to the ion entrance into soil and then increased due to the ion extraction from soil under the electric field. Accumulated electroosmotic flow was $NaCl>KH_2PO_4>MgSO_4$ at the same concentration because the ionic strength of $MgSO_4$ was the highest and $Mg(OH)_2$ formed near the cathode reservoir plugged up soil pore to inhibit water flow. When hydrogen peroxide was contained in electrolyte solution, removal efficiency increased by Fenton reaction. When NaCl was used as an electrolyte compound, chlorine ($Cl_2$) was generated at the anode and dissolved to form hypochlorous acid (HClO), which increased phenanthrene removal. Therefore, the electrode reaction of electrolyte in the anode reservoir as well as its transport into soil should be considered to improve removal efficiency of EK-Fenton process.
Keywords
Electrokinetic-Fenton process; Phenanthrene; Hydrogen peroxide; Sodium chloride; Hypochlorous acid;
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