Journal of Korean Society for Atmospheric Environment (한국대기환경학회지)

Korean Society for Atmospheric Environment (한국대기환경학회)
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Odor Emission from Sediments in Sewer Systems and Odor Removal using an Electrolytic Oxidation Process

하수관거에 퇴적된 유기물에 의한 악취 발생과 산화전리시스템을 이용한 악취 저감

  • Ahn, Hae-Young (Department of Civil and Environmental Engineering, Sejong University) ;
  • Shin, Seung-Kyu (Department of Civil and Environmental Engineering, Sejong University) ;
  • Song, Ji-Hyeon (Department of Civil and Environmental Engineering, Sejong University)
  • 안해영 (세종대학교 건설환경공학과) ;
  • 신승규 (세종대학교 건설환경공학과) ;
  • 송지현 (세종대학교 건설환경공학과)
  • Received : 2011.10.25
  • Accepted : 2011.12.01
  • Published : 2011.12.31
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Abstract

Odor emission from domestic sewer systems has become a serious environmental problem. An investigation on a sewer manhole revealed that anaerobic decay of sediment organic matters (SOMs) and related declines of oxidation reduction potential (ORP) in the sediment layer were the main reason of the production of volatile sulfur compounds. In addition, as the anaerobic decaying period continued, the odor intensity rapidly increased with increasing concentrations of $H_2S$ and dimethyl sulfide. As a feasible method to control SOMs and to minimize odor emission potentials, an electrolytic oxidation process has been employed to the sediment sludge phase. In this study, voltages applied to the electrolytic oxidation process were varied as a main system parameter, and its effects on odor removal efficiencies and reaction characteristics were investigated. At the applied voltages greater than 20 V, the system efficiently oxidized the organic matter, and the ORP in the sludge phase increased rapidly. As a consequence, the removal efficiency of hydrogen sulfide was found to be >99% within 60 minutes of the electrolytic oxidation. Overall, the electrolytic oxidation process can be an alternative to control odor emission from sewer systems, and a threshold input energy needs to be determined to achieve effective operation of the process.

Keywords

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