Journal of Korean Society of Water and Wastewater (상하수도학회지)

The Korean Society of Water and Wastewater (대한상하수도학회)
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Verification of Silt Density Index (SDI) as a fouling index for reverse osmosis (RO) feed water

역삼투 공정 파울링 지표로서 SDI(Silt Density Index)의 적합성 검증

  • 김수한 (부경대학교 토목공학과) ;
  • 김충환 (한국수자원공사 K-water연구원 상하수도연구소) ;
  • 강석형 (한국수자원공사 K-water연구원 상하수도연구소) ;
  • 이원태 (한국건설기술연구원 건설환경연구실) ;
  • 임재림 (한국수자원공사 K-water연구원 상하수도연구소)
  • Published : 2011.08.15
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Abstract

Silt Density Index (SDI) has been used as a fouling index for reverse osmosis (RO) processes for decades. In order to decrease RO fouling, feed water should meet SDI standard, which was used to select a proper pretreatment system for RO processes. However, SDI is supposed to be sensitive only to particles larger than 0.45 ${\mu}m$ in terms of diameters while nanoparticles and dissolved organic matter can be potent foulants for RO processes. Our study started from the suspected performance of SDI as a RO fouling index. SDI data from pilot plants located world wide including South Korea were collected and analyzed. Suspended partcle concentration (i.e., turbidity and particle counts), and dissolved organic matter concentration (i.e., dissolved orgnaic carbon (DOC) concentration) data were also collected and compared to SDI values of same water samples. We found that SDI values were not only affected by suspended particle concentration but also by dissolved organic matter concentration. Therefore SDI can be used as a reasonable fouling index for RO feed water because the main foulants for RO processes are suspended particle and dissolved organic matter.

Keywords

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