상하수도학회지 (Journal of Korean Society of Water and Wastewater)

  • 제23권5호
  • /
  • Pages.669-678
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  • 2009
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  • 1225-7672(pISSN)
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  • 2287-822X(eISSN)
대한상하수도학회 (The Korean Society of Water and Wastewater)
권호 표지

전기펜톤공정을 이용한 석유화학공장 폐활성슬러지의 감량화 가능성 평가

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

  • 정종민 (한국과학기술연구원 환경기술연구단) ;
  • 김경일 (한국과학기술연구원 환경기술연구단) ;
  • 심나타리아 (한국과학기술연구원 환경기술연구단) ;
  • 박철희 ((주) SK 기술원) ;
  • 이상협 (한국과학기술연구원 환경기술연구단)
  • 투고 : 2009.08.24
  • 심사 : 2009.10.12
  • 발행 : 2009.10.15
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초록

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.

키워드

과제정보

연구 과제 주관 기관 : (주) SK 에너지

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