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Solid-salt pressure-retarded osmosis with exothermic dissolution energy for sustainable electricity production
- Authors
- Choi, Wook; Bae, Harim; Ingole, Pravin G.; Lee, Hyung Keun; Kwak, Sung Jo; Jeong, Nam Jo; Park, Soon-Chul; Kim, Jong Hak; Lee, Jonghwi; Park, Chul Ho
- Issue Date
- Mar-2015
- Publisher
- TECHNO-PRESS
- Keywords
- salinity gradient power; pressure-retarded osmosis; exothermic; calcium chloride; solid salt
- Citation
- MEMBRANE WATER TREATMENT, v.6, no.2, pp 113 - 126
- Pages
- 14
- Journal Title
- MEMBRANE WATER TREATMENT
- Volume
- 6
- Number
- 2
- Start Page
- 113
- End Page
- 126
- ISSN
- 2005-8624
2092-7037
- 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/m(2) with exothermic energy and 8.9 W/m(2) 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 similar to 13% of the theoretical value.
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