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

Wook Choi, Harim Bae, Pravin G. Ingole, Hyung Keun Lee, Sung Jo Kwak, Nam Jo Jeong, Soon Chul Park, Jong Hak Kim, Jonghwi Lee, Chul Ho Park

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3 Citations (Scopus)

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 11 W/m2 with exothermic energy and 8.9 W/m2 without at 35 bar using a HTI FO membrane (water permeability A = 0.375 L m-2 h-1 bar-1). These empirical power densities are ~13% of the theoretical value.

Original languageEnglish
Pages (from-to)113-126
Number of pages14
JournalMembrane Water Treatment
Volume6
Issue number2
DOIs
Publication statusPublished - 2015 Jan 1

All Science Journal Classification (ASJC) codes

  • Chemical Engineering(all)
  • Water Science and Technology

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    Choi, W., Bae, H., Ingole, P. G., Lee, H. K., Kwak, S. J., Jeong, N. J., Park, S. C., Kim, J. H., Lee, J., & Park, C. H. (2015). Solid-salt pressure-retarded osmosis with exothermic dissolution energy for sustainable electricity production. Membrane Water Treatment, 6(2), 113-126. https://doi.org/10.12989/mwt.2015.6.2.113