대한환경공학회지 (Journal of Korean Society of Environmental Engineers)

  • 제38권9호
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  • Pages.476-481
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  • 2016
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  • 1225-5025(pISSN)
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  • 2383-7810(eISSN)
대한환경공학회 (Korean Society of Environmental Engineers)
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나권형 모듈을 이용한 압력지연삼투 공정의 에너지생산에 관한 연구

Assessment of Power Generation by Pressure Retarded Osmosis Process from Spiral-Wound Membrane Pilot-Plant

  • 투고 : 2016.01.18
  • 심사 : 2016.08.15
  • 발행 : 2016.09.30
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초록

압력지연삼투는 삼투압을 구동력으로 하여 에너지를 생산하는 새로운 막 기술이다. 압력지연삼투는 반투과성 막을 사이에 두고 삼투압으로 인해 저농도의 유입원수가 고농도의 유도용액으로 이동하는 것이다. 본 연구는 역삼투 공정의 농축수를 유도용액으로, 역삼투 공정의 생산수를 유입원수로 하여 8인치 나권형 막모듈의 성능을 평가 하였다. 실험에 사용된 유입원수와 유도용액의 유량은 2.4 L/min, 5.0 L/min, 10.0 L/min, 압력범위는 5 bar에서 30 bar이다. 유입원수와 유도용액의 농도, 유입유량, 유입비에 따른 공정 성능의 영향을 본 연구에서 확인 하였다. 중요 결과로 유도용액의 농도의 증가는 압력지연삼투 공정의 전력밀도, 투과수량을 향상시키는 결과를 보였다. 유입유량의 증가 또한 전력밀도와 투과수량을 향상시키는 결과를 보였다. 또한 최대 전력밀도를 형성하는 유입원수와 유도용액의 최적 유입비는 1:1의 비에서 나타났다.

Pressure retarded osmosis (PRO) is a quite new technique for power generation using an osmotically driven membrane process. In the PRO process, water permeates through a semipermeable membrane from a low concentration feed solution to a high concentration draw solution due to osmotic pressure. This study carried out to evaluate the performance of the 8 in spiral wound membrane module using reverse osmosis concentrate for a draw solution and reverse osmosis permeate for a feed solution. Three different flowrates of draw and feed solution, such as 2.4 L/min, 5.0 L/min, and 10.0 L/min were used to estimate the power density and water flux under various range of hydraulic pressure differences between 5 bar and 30 bar. In addition, the effects of feed and draw solution concentration, flowrate, and mixing ratio on 8 in spiral wound PRO membrane module performance were investigated in this study. As major results, increases of the draw solution concentration lead to the improvement of power denstiy, and water flux. Also, increase of flowrate resulted in the improvement of power density and water flux. In addition, optimal mixing ratio of draw and feed solution inlet flowrate was found to be 1:1 to attain a maximum power denstiy.

키워드

참고문헌

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