Journal of Korean Society on Water Environment (한국물환경학회지)

Korean Society on Water Environment (한국물환경학회)
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Molecular Size Distributions of NOM in Conventional and Advanced Water Treatment Processes

기존수처리 공정 및 고도정수처리 공정에서 NOM의 분자크기 분포 변화

  • Choi, Il-Hwan (Water Analysis and Research Center, Korea Water Resources Corporation) ;
  • Jung, Yu-Jin (Water Analysis and Research Center, Korea Water Resources Corporation)
  • 최일환 (한국수자원공사 수돗물분석연구센터) ;
  • 정유진 (한국수자원공사 수돗물분석연구센터)
  • Received : 2008.06.02
  • Accepted : 2008.10.14
  • Published : 2008.11.30
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Abstract

The purpose of this study was to find out the variation between molecular size distribution (MSD) of natural organic matter (NOM) in raw waters after different water treatment processes like conventional process (coagulation, flocculation, filtration) followed by advanced oxidation process (ozonation, GAC adsorption). The MSD of NOM of Suji pilot plant were determined by Liquid Chromatography-Organic Carbon Detection (LC-OCD) which is a kine of high-performance size-exclusion chromatography (HPSEC) with nondispersive infrared (NDIR) detector and $UV_{254}$ detector. Five distinct fractions were generally separated from water samples with the Toyopearl HW-50S column, using 28 mmol phosphate buffer at pH 6.58 as an eluent. Large and intermediate humic fractions were the most dominant fractions in surface water. High molecular weight (HMW) matter was clearly easier to remove in coagulation and clarification than low molecular weight (LMW) matter. Water treatment processes removed the two largest fractions almost completely shifting the MSD towards smaller molecular size in DW. No more distinct variation of MSD was observed by ozone process after sand filtration but the SUVA value were obviously reduced during increase of the ozone doses. UVD results and HS-Diagram demonstrate that ozone induce not the variation of molecular size of humic substance but change the bond structure from aromatic rings or double bonds to single bond. Granular activated carbon (GAC) filtration removed 8~9% of organic compounds and showed better adsorption property for small MSD than large one.

Keywords

References

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