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http://dx.doi.org/10.11001/jksww.2017.31.4.303

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

Han, Man Jae (Toray Chemical Korea Inc., R&D Institute)
Sim, Yeonju (Toray Chemical Korea Inc., R&D Institute)
Lee, Jong Hwa (Toray Chemical Korea Inc., R&D Institute)
Publication Information
Journal of Korean Society of Water and Wastewater / v.31, no.4, 2017 , pp. 303-310 More about this Journal
Abstract
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.
Keywords
Pressure retarded osmosis; Power density; PRO module; Thin-film composite membrane;
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