Journal of Korean Society of Water and Wastewater (상하수도학회지)

The Korean Society of Water and Wastewater (대한상하수도학회)
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Optimum dimensionally stable anode with volatilization and electrochemical advanced oxidation for volatile organic compounds treatment

전극의 부반응 기포발생에 따른 휘발특성과 전기화학고도산화능을 동시에 고려한 휘발성 유기화합물 처리용 최적 불용성전극 개발

  • Cho, Wan-Cheol (Department of Environmental Engineering, Korea Maritime and Ocean University) ;
  • Poo, Kyung-Min (Department of Environmental Engineering, Korea Maritime and Ocean University) ;
  • Lee, Ji-Eun (Department of Environmental Engineering, Korea Maritime and Ocean University) ;
  • Kim, Tae-Nam (Department of Environmental Engineering, Korea Maritime and Ocean University) ;
  • Chae, Kyu-Jung (Department of Environmental Engineering, Korea Maritime and Ocean University)
  • 조완철 (한국해양대학교 환경공학과) ;
  • 부경민 (한국해양대학교 환경공학과) ;
  • 이지은 (한국해양대학교 환경공학과) ;
  • 김태남 (한국해양대학교 환경공학과) ;
  • 채규정 (한국해양대학교 환경공학과)
  • Received : 2018.11.21
  • Accepted : 2019.01.09
  • Published : 2019.02.15
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Abstract

Volatile organic compounds(VOCs) are toxic carcinogenic compounds found in wastewater. VOCs require rapid removal because they are easily volatilized during wastewater treatment. Electrochemical advanced oxidation processes(EAOPs) are considered efficient for VOC removal, based on their fast and versatile anodic electrochemical oxidation of pollutants. Many studies have reported the efficiency of removal of various types of pollutants using different anodes, but few studies have examined volatilization of VOCs during EAOPs. This study examined the removal efficiency for VOCs (chloroform, benzene, trichloroethylene and toluene) by oxidization and volatilization under a static stirred, aerated condition and an EAOP to compare the volatility of each compound. The removal efficiency of the optimum anode was determined by comparing the smallest volatilization ratio and the largest oxidization ratio for four different dimensionally stable anodes(DSA): Pt/Ti, $IrO_2/Ti$, $IrO_2/Ti$, and $IrO_2-Ru-Pd/Ti$. EAOP was operated under same current density ($25mA/cm^2$) and electrolyte concentration (0.05 M, as NaCl). The high volatility of the VOCs resulted in removal of more than 90% within 30 min under aerated conditions. For EAOP, the $IrO_2-Ru/Ti$ anode exhibited the highest VOC removal efficiency, at over 98% in 1 h, and the lowest VOC volatilization (less than 5%). Chloroform was the most recalcitrant VOC due to its high volatility and chemical stability, but it was oxidized 99.2% by $IrO_2-Ru/Ti$, 90.2% by $IrO_2-Ru-Pd/Ti$, 78% by $IrO_2/Ti$, and 75.4% by Pt/Ti anodes The oxidation and volatilization ratios of the VOCs indicate that the $IrO_2-Ru/Ti$ anode has superior electrochemical properties for VOC treatment due to its rapid oxidation process and its prevention of bubbling and volatilization of VOCs.

Keywords

References

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