Journal of Korean Society of Water and Wastewater (상하수도학회지)

The Korean Society of Water and Wastewater (대한상하수도학회)
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Effects of temperature and pressure on process performance in brackish water reverse osmosis

기수 역삼투 공정에서 온도와 압력이 공정성능에 미치는 영향

  • Sun-A An (Department of Environmental Engineering and Energy, Myongji University) ;
  • Cheol-Gyu Park (Department of Environmental Engineering and Energy, Myongji University) ;
  • Jin-San Lee (Department of Environmental Engineering and Energy, Myongji University) ;
  • Seong-Min Cho (Department of Environmental Engineering and Energy, Myongji University) ;
  • Han-Seung Kim (Department of Environmental Engineering and Energy, Myongji University)
  • 안선아 (명지대학교 환경에너지공학과) ;
  • 박철규 (명지대학교 환경에너지공학과) ;
  • 이진산 (명지대학교 환경에너지공학과) ;
  • 조성민 (명지대학교 환경에너지공학과) ;
  • 김한승 (명지대학교 환경에너지공학과)
  • Received : 2022.12.20
  • Accepted : 2023.02.14
  • Published : 2023.02.15
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Abstract

This study was conducted to evaluate the filtration performance according to the feed temperature composed of NaCl and the operating pressure of the brackish water reverse osmosis (BWRO) process. The temperature is known that decides the filtration performance of reverse osmosis (RO). It is noted that temperature increase activates the permeate of salts due to augment of diffusivity and mass transfer. Filtration of the lab-scale RO system was performed with constant pressure and the constant flow was simulated. The salt rejection measured by the concentration of the feed and permeate was compared with water permeability and salt permeability in the conditions containing various temperatures (5, 10, 15, 20, 25, and 30℃) and pressures (10, 12, 15, and 18 bar). An increase in feed temperature from 5 ℃ to 30 ℃ caused a 4.65% decrease in salt rejection in CSM, due to an increase in salt permeability (4.06 times) rather than an increase in water permeability (2.62 times). Specific energy consumption (SEC) was calculated by using an electricity meter set in the RO system. It was expected that the SEC by the increases in temperature and pressure decreased due to the viscosity decline of the feed and the permeate flux augment, respectively. The SEC decreased by 63.4% in CSM and by 54.3% in Nittodenko when the feed temperature increased from 5 ℃ to 30 ℃. It discussed how to operate the optimal RO process through the effect of temperature and operating pressure and the comparison of SEC.

Keywords

Acknowledgement

본 연구는 한국환경산업기술원 "수열 활용확대 기술 및 환경적합성 기술개발사업(G232020120073)"의 지원으로 수행되었습니다.

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