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A study on reduction of excess sludge in activated sludge system from a petrochemical plant using electro fenton process  

Chung, Chong Min (한국과학기술연구원 환경기술연구단)
Kim, Kyung Il (한국과학기술연구원 환경기술연구단)
Shim, Natalia (한국과학기술연구원 환경기술연구단)
Park, Chul Hee ((주) SK 기술원)
Lee, Sang Hyup (한국과학기술연구원 환경기술연구단)
Publication Information
Journal of Korean Society of Water and Wastewater / v.23, no.5, 2009 , pp. 669-678 More about this Journal
Abstract
The reduction of excess activated sludge from petrochemical plant was investigated by the electro fenton (E-Fenton) process using electrogenerated hydroxyl radicals which lead to mineralization of activated sludge to $CO_2$, water and inorganic ions. Factors affecting the disintegration efficiency of excess activated sludge in E-Fenton process were examined in terms of five criteria: pH, $H_2O_2/Fe^{2+}$ molar ratio, current density, initial MLSS (mixed liquid suspended solids) concentration, $H_2O_2$ feeding mode. TSS total suspended solid and $TCOD_{cr}$ reduction rate increased with the increasing $H_2O_2/Fe^{2+}$ molar ratio and current density until 42 and $6.7 mA/cm^2$, respectively but further increase of $H_2O_2/Fe^{2+}$ molar ratio and current density would reduce the reduction rate. On the other hand, as expected, increasing pH and initial MLSS concentration of activated sludge decreas TSS and $TCOD_{cr}$ reduction rate. The E-Fenton process was gradually increased during first 30 minutes and then linearly proceed till 120 minutes. The optimal E-Fenton condition showed TSS reduction rate of 62~63% and $TCOD_{cr}$ (total chemical oxygen demand) reduction rate of 55~56%. Molar ratio $H_2O_2/Fe^{2+} = 42$ was determined as optimal E-Fenton condition with initial $Fe^{2+}$ dose of 5.4 mM and current density of $6.7{\sim}13.3 mA/cm^2$, initial MLSS of 7,600 mg/L and pH 2 were chosen as the most efficient E-Fenton condition.
Keywords
electro fenton (E-Fenton) process; pH; $H_2O_2/Fe^{2+}$ molar ratio; current density; MLSS; $H_2O_2$ feeding mode;
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