Journal of Korean Society of Water and Wastewater (상하수도학회지)

The Korean Society of Water and Wastewater (대한상하수도학회)
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Considerations to design high-pressure membrane system to produce high quality potable water with lower organic matter concentration

유기물 농도가 낮은 고품질 정수 생산을 위한 고압막여과 공정 설계 시 고려사항

  • Jeon, Jongmin (Department of Civil Engineering, Pukyong National University) ;
  • Kim, Seong-Su (Smart Water Research Institute, K-water Institute) ;
  • Seo, Inseok (Smart Water Research Institute, K-water Institute) ;
  • Kim, Suhan (Department of Civil Engineering, Pukyong National University)
  • 전종민 (부경대학교 토목공학과) ;
  • 김성수 (한국수자원공사 K-water연구원 스마트워터연구소) ;
  • 서인석 (한국수자원공사 K-water연구원 스마트워터연구소) ;
  • 김수한 (부경대학교 토목공학과)
  • Received : 2020.08.28
  • Accepted : 2020.11.18
  • Published : 2020.12.15
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Abstract

High-pressure membrane system like nanofiltration(NF) and reverse osmosis(RO) was investigated as a part of water treatment processes to produce high quality potable water with low organic matter concentration through membrane module tests and design simulation. River water and sand filtration permeate in Busan D water treatment plant were selected as feed water, and NE4040-90 and RE4040-Fen(Toray Chemical Korea) were used as NF and RO membranes, respectively. Total organic carbon(TOC) concentrations of NF and RO permeates were mostly below 0.5 mg/l and the average TOC removal rates of NF and RO membranes were 93.99% and 94.28%, respectively, which means NF used in this study is competitive with RO in terms of organic matter removal ability. Different from ions rejection tendency, the TOC removal rate increases at higher recovery rates, which is because the portion of higher molecular weight materials in the concentrated raw water with increasing recovery rate increases. Discharge of NF/RO concentrates to rivers may not be acceptable because the increased TDS concentration of the concentrates can harm the river eco-system. Thus, the idea of using NF/RO concentrate as the raw water for industrial water production was introduced. The design simulation results with feed water and membranes used in this work reveal that the raw water guideline can be satisfied if the recovery rate of NF/RO system is designed below 80%.

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References

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