Journal of Korean Society on Water Environment (한국물환경학회지)

Korean Society on Water Environment (한국물환경학회)
권호 표지

Formation and Removal of Trihalomethanes based on Characterization of Hydrophobic and Hydrophilic Precursors

전구물질의 소수성 및 친수성 특성에 따른 트리할로메탄의 생성과 제거에 관한 연구

  • Jeon, Heekyung (Korea Institute of Science and Technology) ;
  • Kim, Junsung (Department of Civil and Environmental Engineering, University of Massachusetts) ;
  • Choi, Yoonchan (Busan Development Institute) ;
  • Choi, Haeyeon (Department of Food and Nutrition, Sookmyung women's University) ;
  • Chung, Yong (Department of Preventive Medicine and Public Health, Yonsei University College of Medicine)
  • 전희경 (한국과학기술연구원) ;
  • 김준성 (메사추세츠 주립대학교) ;
  • 최윤찬 (부산발전연구원) ;
  • 최해연 (숙명여자대학교) ;
  • 정용 (연세대학교 의과대학 예방의학교실)
  • Received : 2007.11.19
  • Accepted : 2008.01.29
  • Published : 2008.01.30
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Abstract

The Dissolved Organic Carbon (DOC) existing in a water includes both hydrophobic and hydrophilic substances however, most of the discussion focuses on hydrophobic substances. The hydrophobic fraction was easily removed by absorption or coagulation more than hydrophilic fraction. Therefore, control of the hydrophilic fraction is very important in water treatment process. This study is to determine the variation of DOC, the removal efficiency of DOC, and Trihalomethane formation potential (THMFP) after each stage of water treatment process by fractionating Natural Organic Matters (NOM) into hydrophobic and hydrophilic substance. DOC from raw water was fractionated at acidic pH (pH<2) using XAD 8 resin column, into two fraction : hydrophobic substance (i.e. humic substance) adsorbed on XAD 8 and hydrophilic substance which represent the organics contained in the final effluent. THMFP was carried out according to the following set condition: Cl2/DOC=4 mg/mg, incubation at $25^{\circ}C$ in darkness, pH 7 adjust with HCl or NaOH as necessary, and 72hour-contact time. THMs analyzed in this study were chloroform, bromodichloromethane, dibromochloromethan, and bromoform. Sewage was almost evenly split between the hydrophobic (56%) and hydrophilic fraction (44%). But, Aldrich humic substance (AHS) was found to contain less hydrophilics (14%) than hydrophobics (86%). The formation of THMs may depend on the source which is characterized by the composition of organic matters such as AHS and sewage. The THMFP yield of sewage and AHS were assessed as follows. The value of the THMFP reaction yield, AHS $172.65{\mu}g/mg$, is much higher than that of sewage $41.68{\mu}g/mg$. This illustrates possible significant difference in THMFP according to the component type and the proportion of organic matter existing in water source. Apparently AHS react with chlorine to produce more THMFP than do the smaller molecules found in sewage. Water treatment process may reduce THMFP, nevertheless residual DOC (the more hydrophilic substance) has significant THMFP. Further reduction in organic halide precursors requires application of alternative treatment techniques.

Keywords

References

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