Membrane Journal (멤브레인)

The Membrane Society of Korea (한국막학회)
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Optimal Flow Rate Evaluation for Low Energy, High Efficiency Cleaning of Forward Osmosis (FO)

정삼투 공정의 저에너지 고효율 세정을 위한 최적 유속 평가

  • Kim, Yihyang (School of Civil, Environmental and Architectural Engineering, Korea University) ;
  • Kim, Jungbin (School of Civil, Environmental and Architectural Engineering, Korea University) ;
  • Zhan, Min (School of Civil, Environmental and Architectural Engineering, Korea University) ;
  • Min, Dahae (School of Civil, Environmental and Architectural Engineering, Korea University) ;
  • Hong, Seungkwan (School of Civil, Environmental and Architectural Engineering, Korea University)
  • 김이향 (고려대학교 공과대학 건축사회환경공학부) ;
  • 김정빈 (고려대학교 공과대학 건축사회환경공학부) ;
  • 잔민 (고려대학교 공과대학 건축사회환경공학부) ;
  • 민다혜 (고려대학교 공과대학 건축사회환경공학부) ;
  • 홍승관 (고려대학교 공과대학 건축사회환경공학부)
  • Received : 2019.11.29
  • Accepted : 2019.12.20
  • Published : 2019.12.31
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Abstract

Forward osmosis (FO) is operated at a lower pressure than reverse osmosis (RO), which has great advantages in terms of fouling control, maintenance, membrane cleaning, and potential energy reduction. In particular, since the membrane fouling layer of the forward osmosis process has a relatively loose and dispersed property, it is possible to control the membrane fouling by physical cleaning, unlike the reverse osmosis process. However, existing studies do not apply the proper cleaning flow rate for forward osmosis physical cleaning, and thus there is a limit that the optimal operation can not be performed. Therefore, this study aims to evaluate the justification of proper flow rate that can show high efficiency cleaning with economical energy amount. The membrane fouling experiments of the forward osmosis process were maintained at a circulating flow rate of 8.54 cm/s and the recovery rates were compared with the three cleaning flow rates. As a result of this experiment, it was confirmed that the 2 × speed cleaning showed the same efficiency as the water permeability recovery rate of the 3 × speed cleaning, and it was confirmed that the 2 × speed cleaning was an appropriate flow rate with high cleaning efficiency and economical SEC.

정삼투 공정(forward osmosis, FO)은 역삼투 공정(reverse osmosis, RO)에 비해 저압으로 운영되므로 오염 제어, 유지 보수, 막 세정 및 잠재적 에너지 저감 측면에서 큰 이점이 있어 다양한 분야에 적용할 수 있는 기술이다. 특히, 정삼투 공정의 막오염층이 비교적 느슨하고 분산된 특성을 가지므로 역삼투 공정과 달리 물리세정만으로도 충분한 막오염 제어가 가능하다. 하지만 기존 연구들의 경우 정삼투 물리세정에 적합한 세정 유속을 적용하지 않아 최적화 운전을 하지 못했다는 한계가 있다. 따라서 이 연구는 경제적인 에너지량으로 높은 효율의 세정을 보일 수 있는 적절한 유속의 정당성 평가를 목적으로 한다. 정삼투 공정 막오염 실험을 8.54 cm/s 순환 유속으로 유지하고 세 가지 세정유속으로 회복률과 SEC (specific energy consumption) 비교 평가하였다. 이 실험의 결과로 2배속 세정이 3배속 세정의 수투과도 회복률 만큼의 높은 효율을 보이는 동시에, 2배속 세정이 높은 세정효율 및 경제적인 SEC를 보이는 적절한 유속이라는 것을 확인하였다.

Keywords

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