Journal of Korean Society of Water and Wastewater (상하수도학회지)

The Korean Society of Water and Wastewater (대한상하수도학회)
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Effects of magnetic ion exchange resin with PACI coagulation on removal of natural organic matter and MF fouling

자성체 이온교환 수지와 PACI 응집에 의한 국내 주요 수계 내 자연유기물 제거 특성 및 막오염 저감 효과

  • 최양훈 (건국대학교 공과대학 환경공학과) ;
  • 정영미 (한국과학기술연구원 환경기술연구단) ;
  • 김영삼 (건국대학교 공과대학 환경공학과) ;
  • 이승렬 (건국대학교 공과대학 환경공학과) ;
  • 권지향 (건국대학교 공과대학 환경공학과) ;
  • 권순범 (한국수자원공사 수자원연구소)
  • Received : 2007.07.26
  • Accepted : 2008.02.05
  • Published : 2008.02.15
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Abstract

The application of magnetic ion exchange resin($MIEX^{(R)}$) is effective for natural organic matter(NOM) removal and for control of the formation of disinfection byproducts(DBPs). NOM removal is also enhanced by adding $MIEX^{(R)}$ with coagulant such as polyaluminium chloride(PACl) in conventional drinking water treatment systems. In the application of $MIEX^{(R)}$, it is important to understand changes of NOM characteristics such as hydrophobicity and molecular weight distributions with $MIEX^{(R)}$ or $MIEX^{(R)}$+coagulant treatment.To observe characteristics of NOM by treatment with $MIEX^{(R)}$ or $MIEX^{(R)}$+coagulant, four major drinking water sources were employed. Results showed that the addition of $MIEX^{(R)}$ to coagulation significantly reduced the amount of coagulant required for the optimum removal of dissolved organic matter(DOC) and turbidity in the all four waters. The DOC removal was also increased approximately 20%, compared to coagulant treatment alone. The process with $MIEX^{(R)}$ and coagulant showed that complementary removal of hydrophobic and hydrophilic fraction of DOC. The combined processes preferentially removed the fractions of intermediate (3,000-10,000 Da) and low (< 500 Da) molecular weight. The microfiltration test showed that membrane cake resistance was decreased for waters with flocs from $MIEX^{(R)}$+coagulant. A porous layer was formed to $MIEX^{(R)}$ on the membrane surface and the layer consequently inhibited settling of coagulant flocs, which could act on a foulant.

Keywords

Acknowledgement

Supported by : 한국수자원공사

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