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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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 |
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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. |
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School of Civil and Environmental Engineering |
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School of Civil and Environmental Engineering She, Qianhong Jin, Xue Tang, Chuyang Y. |
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She, Qianhong Jin, Xue Tang, Chuyang Y. |
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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 |
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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 |
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2013 |
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https://hdl.handle.net/10356/100263 http://hdl.handle.net/10220/13614 |
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