Membrane and Water Treatment

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Solid-salt pressure-retarded osmosis with exothermic dissolution energy for sustainable electricity production

  • Choi, Wook (Greenhouse Gas Research Center, Korea Institute of Energy Research (KIER)) ;
  • Bae, Harim (Jeju Global Research Center (JGRC), Korea Institute of Energy Research (KIER)) ;
  • Ingole, Pravin G. (Greenhouse Gas Research Center, Korea Institute of Energy Research (KIER)) ;
  • Lee, Hyung Keun (Greenhouse Gas Research Center, Korea Institute of Energy Research (KIER)) ;
  • Kwak, Sung Jo (Jeju Global Research Center (JGRC), Korea Institute of Energy Research (KIER)) ;
  • Jeong, Nam Jo (Jeju Global Research Center (JGRC), Korea Institute of Energy Research (KIER)) ;
  • Park, Soon-Chul (Jeju Global Research Center (JGRC), Korea Institute of Energy Research (KIER)) ;
  • Kim, Jong Hak (Department of Chemical and Biomolecular Engineering, Yonsei University) ;
  • Lee, Jonghwi (Department of Chemical Engineering and Materials Science, Chung-Ang University) ;
  • Park, Chul Ho (Jeju Global Research Center (JGRC), Korea Institute of Energy Research (KIER))
  • Received : 2014.10.01
  • Accepted : 2014.12.30
  • Published : 2015.03.25
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Abstract

Salinity gradient power (SGP) systems have strong potential to generate sustainable clean electricity for 24 hours. Here, we introduce a solid-salt pressure-retarded osmosis (PRO) system using crystal salt powders rather than seawater. Solid salts have advantages such as a small storage volume, controllable solubility, high Gibbs dissolution energy, and a single type of water intake, low pretreatment costs. The power densities with 3 M draw solutions were $11W/m^2$ with exothermic energy and $8.9W/m^2$ without at 35 bar using a HTI FO membrane (water permeability $A=0.375L\;m^{-2}h^{-1}bar^{-1}$). These empirical power densities are ~13% of the theoretical value.

Keywords

Acknowledgement

Supported by : Korea Institute of Energy Research (KIER)

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