Membrane structure-dependent limiting flux behavior and membrane selectivity loss during gypsum scaling : implications for pressure-retarded osmosis operation and membrane design
Herein, we systematically investigated the influence of membrane structural properties on limiting flux behavior and selectivity loss during gypsum scaling in osmotically driven membrane processes. We selected two typical osmotic membranes, thin-film composite (TFC) polyamide (PA) membrane and integ...
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sg-ntu-dr.10356-1542192021-12-16T05:04:31Z Membrane structure-dependent limiting flux behavior and membrane selectivity loss during gypsum scaling : implications for pressure-retarded osmosis operation and membrane design Fei, Jingyuan Mai, Weiting Cheng, Pak Shing Shi, Jeffrey Liu, Zongwen She, Qianhong School of Civil and Environmental Engineering Singapore Membrane Technology Centre Engineering::Civil engineering Pressure-Retarded Osmosis Gypsum Scaling Herein, we systematically investigated the influence of membrane structural properties on limiting flux behavior and selectivity loss during gypsum scaling in osmotically driven membrane processes. We selected two typical osmotic membranes, thin-film composite (TFC) polyamide (PA) membrane and integrally asymmetric cellulose triacetate (CTA) membrane with different structures, for gypsum scaling tests in active-layer-facing-draw-solution orientation (an operating mode preferred for pressure-retarded osmosis). Compared to the CTA membrane, the TFC membrane suffered severer internal scaling and achieved a lower limiting flux primarily due to its greater structural parameter that induced severer internal concentration polarization (ICP)-enhanced scaling. The limiting flux is inversely proportional to the membrane structural parameter. For the first time we observed that the TFC membrane suffered a drastic loss of integrity and selectivity after gypsum scaling in PRO. We confirmed that the thin PA layer of TFC membrane is more prone to being damaged by the growth of gypsum crystals inside the confined and unstirred support layer, whereas the integrally asymmetric membrane with a thicker active layer could better maintain its integrity. While TFC membrane is the mainstream for PRO in osmotic power harvesting, our study suggests that the integrally asymmetric membrane may be more suitable under severe scaling conditions. Nanyang Technological University This research was supported by the Faculty of Engineering and Information Technologies Early Career Researcher Funding Scheme at The University of Sydney, Australia. Q.S. is also grateful to the support of the Start-up Grant (SUG) from Nanyang Technological University, Singapore. 2021-12-16T05:04:31Z 2021-12-16T05:04:31Z 2020 Journal Article Fei, J., Mai, W., Cheng, P. S., Shi, J., Liu, Z. & She, Q. (2020). Membrane structure-dependent limiting flux behavior and membrane selectivity loss during gypsum scaling : implications for pressure-retarded osmosis operation and membrane design. Desalination, 492, 114644-. https://dx.doi.org/10.1016/j.desal.2020.114644 0011-9164 https://hdl.handle.net/10356/154219 10.1016/j.desal.2020.114644 2-s2.0-85089014192 492 114644 en Desalination © 2020 Elsevier B.V. All rights reserved. |
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Engineering::Civil engineering Pressure-Retarded Osmosis Gypsum Scaling Fei, Jingyuan Mai, Weiting Cheng, Pak Shing Shi, Jeffrey Liu, Zongwen She, Qianhong Membrane structure-dependent limiting flux behavior and membrane selectivity loss during gypsum scaling : implications for pressure-retarded osmosis operation and membrane design |
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Herein, we systematically investigated the influence of membrane structural properties on limiting flux behavior and selectivity loss during gypsum scaling in osmotically driven membrane processes. We selected two typical osmotic membranes, thin-film composite (TFC) polyamide (PA) membrane and integrally asymmetric cellulose triacetate (CTA) membrane with different structures, for gypsum scaling tests in active-layer-facing-draw-solution orientation (an operating mode preferred for pressure-retarded osmosis). Compared to the CTA membrane, the TFC membrane suffered severer internal scaling and achieved a lower limiting flux primarily due to its greater structural parameter that induced severer internal concentration polarization (ICP)-enhanced scaling. The limiting flux is inversely proportional to the membrane structural parameter. For the first time we observed that the TFC membrane suffered a drastic loss of integrity and selectivity after gypsum scaling in PRO. We confirmed that the thin PA layer of TFC membrane is more prone to being damaged by the growth of gypsum crystals inside the confined and unstirred support layer, whereas the integrally asymmetric membrane with a thicker active layer could better maintain its integrity. While TFC membrane is the mainstream for PRO in osmotic power harvesting, our study suggests that the integrally asymmetric membrane may be more suitable under severe scaling conditions. |
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School of Civil and Environmental Engineering |
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School of Civil and Environmental Engineering Fei, Jingyuan Mai, Weiting Cheng, Pak Shing Shi, Jeffrey Liu, Zongwen She, Qianhong |
format |
Article |
author |
Fei, Jingyuan Mai, Weiting Cheng, Pak Shing Shi, Jeffrey Liu, Zongwen She, Qianhong |
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Fei, Jingyuan |
title |
Membrane structure-dependent limiting flux behavior and membrane selectivity loss during gypsum scaling : implications for pressure-retarded osmosis operation and membrane design |
title_short |
Membrane structure-dependent limiting flux behavior and membrane selectivity loss during gypsum scaling : implications for pressure-retarded osmosis operation and membrane design |
title_full |
Membrane structure-dependent limiting flux behavior and membrane selectivity loss during gypsum scaling : implications for pressure-retarded osmosis operation and membrane design |
title_fullStr |
Membrane structure-dependent limiting flux behavior and membrane selectivity loss during gypsum scaling : implications for pressure-retarded osmosis operation and membrane design |
title_full_unstemmed |
Membrane structure-dependent limiting flux behavior and membrane selectivity loss during gypsum scaling : implications for pressure-retarded osmosis operation and membrane design |
title_sort |
membrane structure-dependent limiting flux behavior and membrane selectivity loss during gypsum scaling : implications for pressure-retarded osmosis operation and membrane design |
publishDate |
2021 |
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https://hdl.handle.net/10356/154219 |
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1720447197633314816 |