Osmotic power production from salinity gradient resource by pressure retarded osmosis : effects of operating conditions and reverse solute diffusion

Pressure retarded osmosis (PRO) is a potential technology to harvest the renewable osmotic power from the salinity-gradient resources. This study systematically investigated the effects of operating conditions (feed and draw solution concentration, membrane type, membrane orientation, and temperatur...

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Main Authors: She, Qianhong, Jin, Xue, Tang, Chuyang Y.
Other Authors: School of Civil and Environmental Engineering
Format: Article
Language:English
Published: 2013
Online Access:https://hdl.handle.net/10356/100263
http://hdl.handle.net/10220/13614
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Institution: Nanyang Technological University
Language: English
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spelling sg-ntu-dr.10356-1002632020-03-07T11:43:44Z Osmotic power production from salinity gradient resource by pressure retarded osmosis : effects of operating conditions and reverse solute diffusion She, Qianhong Jin, Xue Tang, Chuyang Y. School of Civil and Environmental Engineering Singapore Membrane Technology Centre Pressure retarded osmosis (PRO) is a potential technology to harvest the renewable osmotic power from the salinity-gradient resources. This study systematically investigated the effects of operating conditions (feed and draw solution concentration, membrane type, membrane orientation, and temperature) and reverse solute diffusion on PRO performance using commercially available osmotic membranes. The PRO performance was improved by decreasing the feed solution concentration, increasing the draw solution concentration, orientating the membrane with active layer facing draw solution (AL-DS), and increasing temperature. The membrane with higher water permeability, lower solute permeability and lower structure parameter performed better in PRO process. However, the experimentally obtained power densities for all the membranes used in this study were lower than the predictions from conventional ICP model that assumes membrane separation parameters are constant in PRO process. It was found that this was mainly caused by the severe reverse solute diffusion and thus the enhanced internal concentration polarization (ICP) in PRO. The specific reverse solute flux was found to increase with increasing the applied hydraulic pressure, but the increase of experimental results was much more drastic than the theoretic prediction especially under higher hydraulic pressure, probably due to the increased solute permeability caused by membrane deformation. 2013-09-23T08:38:19Z 2019-12-06T20:19:20Z 2013-09-23T08:38:19Z 2019-12-06T20:19:20Z 2012 2012 Journal Article She, Q., Jin, X.,& Tang, C. Y. (2012). Osmotic power production from salinity gradient resource by pressure retarded osmosis: Effects of operating conditions and reverse solute diffusion. Journal of Membrane Science, 401-402262-273. https://hdl.handle.net/10356/100263 http://hdl.handle.net/10220/13614 10.1016/j.memsci.2012.02.014 en Journal of membrane science
institution Nanyang Technological University
building NTU Library
country Singapore
collection DR-NTU
language English
description Pressure retarded osmosis (PRO) is a potential technology to harvest the renewable osmotic power from the salinity-gradient resources. This study systematically investigated the effects of operating conditions (feed and draw solution concentration, membrane type, membrane orientation, and temperature) and reverse solute diffusion on PRO performance using commercially available osmotic membranes. The PRO performance was improved by decreasing the feed solution concentration, increasing the draw solution concentration, orientating the membrane with active layer facing draw solution (AL-DS), and increasing temperature. The membrane with higher water permeability, lower solute permeability and lower structure parameter performed better in PRO process. However, the experimentally obtained power densities for all the membranes used in this study were lower than the predictions from conventional ICP model that assumes membrane separation parameters are constant in PRO process. It was found that this was mainly caused by the severe reverse solute diffusion and thus the enhanced internal concentration polarization (ICP) in PRO. The specific reverse solute flux was found to increase with increasing the applied hydraulic pressure, but the increase of experimental results was much more drastic than the theoretic prediction especially under higher hydraulic pressure, probably due to the increased solute permeability caused by membrane deformation.
author2 School of Civil and Environmental Engineering
author_facet School of Civil and Environmental Engineering
She, Qianhong
Jin, Xue
Tang, Chuyang Y.
format Article
author She, Qianhong
Jin, Xue
Tang, Chuyang Y.
spellingShingle She, Qianhong
Jin, Xue
Tang, Chuyang Y.
Osmotic power production from salinity gradient resource by pressure retarded osmosis : effects of operating conditions and reverse solute diffusion
author_sort She, Qianhong
title Osmotic power production from salinity gradient resource by pressure retarded osmosis : effects of operating conditions and reverse solute diffusion
title_short Osmotic power production from salinity gradient resource by pressure retarded osmosis : effects of operating conditions and reverse solute diffusion
title_full Osmotic power production from salinity gradient resource by pressure retarded osmosis : effects of operating conditions and reverse solute diffusion
title_fullStr Osmotic power production from salinity gradient resource by pressure retarded osmosis : effects of operating conditions and reverse solute diffusion
title_full_unstemmed Osmotic power production from salinity gradient resource by pressure retarded osmosis : effects of operating conditions and reverse solute diffusion
title_sort osmotic power production from salinity gradient resource by pressure retarded osmosis : effects of operating conditions and reverse solute diffusion
publishDate 2013
url https://hdl.handle.net/10356/100263
http://hdl.handle.net/10220/13614
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