Journal of Korean Society on Water Environment (한국물환경학회지)

Korean Society on Water Environment (한국물환경학회)
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Removal of Sulfamethoxazole using Ozonation or UV Radiation; Kinetic Study and Effect of pH

오존 처리 및 UV 조사를 이용한 Sulfamethoxazole 제거; 동역학적 고찰 및 pH 영향

  • Jung, Yeonjung (Department of Environmental Engineering, YIEST Yonsei University) ;
  • Kim, Wangi (Department of Environmental Engineering, YIEST Yonsei University) ;
  • Jang, Hayoung (Department of Environmental Engineering, YIEST Yonsei University) ;
  • Choi, Yanghwun (Department of Environmental Engineering, YIEST Yonsei University) ;
  • Oh, Byungsoo (Gwangiu Institute of Science and Technology, Center for Seawater Desalination Plant) ;
  • Kang, Joonwun (Department of Environmental Engineering, YIEST Yonsei University)
  • 정연정 (연세대학교 환경공학부) ;
  • 김완기 (연세대학교 환경공학부) ;
  • 장하영 (연세대학교 환경공학부) ;
  • 최양훈 (연세대학교 환경공학부) ;
  • 오병수 (광주과학기술원 해수담수화플랜트 사업단) ;
  • 강준원 (연세대학교 환경공학부)
  • Received : 2007.10.16
  • Accepted : 2007.12.12
  • Published : 2008.01.30
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Abstract

This study was performed to assess the potential use of ozone or UV radiation for the treatment of water contaminated with sulfamethoxazole (SMX), which is frequently used antibiotic in human and veterinary medicines, especially focusing on the kinetic study and effect of pH. In a study using ozone alone, kinetic study was performed to determine second-order rate constant ($k_{O3,SMX}$) for the reactions of SMX with ozone, which was found to be $1.9{\times}10^6M^{-1}s^{-1}$ at pH 7. The removal efficiencies of SMX by ozone were decreased with increase of pH due to rapid decomposition of ozone under the condition of various pH (2.5, 5.3, 7, 8, 10). In a UV irradiation study at 254 nm, a kinetic model for direct photolysis of SMX was developed with determination of quantum yield ($0.08mol\;Einstein^{-1}$) and molar extinction coefficient ($15,872M^{-1}cm^{-1}$) values under the condition of quantum shielding due to the presence of reaction by-products formed during photolysis. For effect of pH on photolysis of SMX, SMX in the anionic state ($S^-$, pH > 5.6), most prevalent form at environmentally relevant pH values, degraded more slowly than in the neutral state (SH, 1.85 < pH < 5.6) by UV radiation at 254 nm.

Keywords

Acknowledgement

Supported by : 한국과학재단

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