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Effect of ionic Strength of Electrolyte on Phenanthrene Removal in Electrokinetic-Fenton Process  

Park Ji-Yeon (Department of Chemical & Biomolecular Engineering, KAIST)
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.10, no.4, 2005 , pp. 18-25 More about this Journal
Abstract
Characteristics of phenanthrene removal in an electrokinetic (EK)-Fenton process were investigated in a viewpoint of concentration and ionic strength of electrolytes. When three kinds of electrolytes (NaCl, $KH_2PO_4,\;and\;MgSO_4$) were used, the increase in electrolyte concentration caused the decrease of electrical potential gradient. The increase of electrical conductivity was due to the increase of ionic concentration in soil. The decrease of accumulated electroosmotic flow (EOF) with increase in electrolyte concentration was due to the decrease of zeta potential. The removal efficiency was in proportion to accumulated EOF which depended on ionic strength. Total energy expenditure without electrolyte was 10-30 times higher than its with 0.5 M electrolyte. The lower removal efficiency was caused by the lower energy expenditure with 0.5 M one. An effective EK-Fenton process was determined from considering the removal efficiency and the energy expenditure, simultaneously.
Keywords
Electrokinetic-Fenton process; Electrolyte; Ionic strength; Hydrogen peroxide;
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