상하수도학회지 (Journal of Korean Society of Water and Wastewater)

  • 제31권4호
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  • Pages.303-310
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  • 2017
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  • 1225-7672(pISSN)
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  • 2287-822X(eISSN)
대한상하수도학회 (The Korean Society of Water and Wastewater)
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고성능 PRO 모듈 개발 및 운전조건이 모듈 성능에 미치는 영향

The development of high-performance PRO module and effects of operating condition on the performance of PRO module

  • 한만재 (도레이케미칼(주) 기술연구소) ;
  • 심연주 (도레이케미칼(주) 기술연구소) ;
  • 이종화 (도레이케미칼(주) 기술연구소)
  • 투고 : 2017.06.23
  • 심사 : 2017.08.02
  • 발행 : 2017.08.29
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초록

Pressure retarded osmosis(PRO) has attracted much attention as potential technology to reduce the overall energy consumption for reverse osmosis(RO) desalination. The RO/PRO hybrid process is considered as the most logical next step for future desalination. The PRO process aims to harness the osmotic energy difference of two aqueous solutions separated by a semipermeable membrane. By using the concentrated water(RO brine) discharged from existing RO plants, the PRO process can effectively exploit a greater salinity gradient to reduce the energy cost of processing concentrated water. However, in order to use RO brine as the draw solution, PRO membrane must have high water flux and enough mechanical strength to withstand the high operational pressure. This study investigates the development of a thin film composite PRO membrane and spiral wound module for high power density. Also, the influence of membrane backing layer on the overall power density was studied using the characteristic factors of PRO membranes. Finally, the performance test of an 8-inch spiral wound module was carried out under various operating conditions(i.e. hydraulic pressure, flow rate, temperature). As the flow rate and temperature increased under the same hydraulic pressure, the PRO performance increased due to the growth of water permeability coefficient and osmotic pressure. For a high performance PRO system, in order to optimize the operating conditions, it is highly recommended that the flow pressure be minimized while the flow rate is maintained at a high level.

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참고문헌

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