Integral hollow fiber membrane with chemical cross-linking for pressure retarded osmosis operated in the orientation of active layer facing feed solution

Pressure retarded osmosis (PRO) is an innovative technique to yield osmotic energy. Nevertheless, the PRO performance is exacerbated by the severe membrane fouling occurring within the porous support. It is a potential alternative for sustainable power harvesting to change the membrane orientation f...

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Main Authors: Li, Ye, Zhao, Shanshan, Setiawan, Laurentia, Zhang, Lizhi, Wang, Rong
Other Authors: School of Civil and Environmental Engineering
Format: Article
Language:English
Published: 2019
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Online Access:https://hdl.handle.net/10356/85314
http://hdl.handle.net/10220/50431
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Institution: Nanyang Technological University
Language: English
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spelling sg-ntu-dr.10356-853142020-09-26T22:01:50Z Integral hollow fiber membrane with chemical cross-linking for pressure retarded osmosis operated in the orientation of active layer facing feed solution Li, Ye Zhao, Shanshan Setiawan, Laurentia Zhang, Lizhi Wang, Rong School of Civil and Environmental Engineering Singapore Membrane Technology Centre Nanyang Environment and Water Research Institute Integral Membrane Pressure Retarded Osmosis Engineering::Environmental engineering::Water treatment Pressure retarded osmosis (PRO) is an innovative technique to yield osmotic energy. Nevertheless, the PRO performance is exacerbated by the severe membrane fouling occurring within the porous support. It is a potential alternative for sustainable power harvesting to change the membrane orientation from active layer facing draw solution (AL−DS) or PRO mode to active layer facing feed solution (AL−FS) or FO mode for a low-fouling propensity. A novel integral PRO hollow fiber membrane was developed in this work by phase inversion and followed with a facile cross-linking post-treatment. The structure and properties of the resultant membrane were systematically investigated using a series of characterization protocols. The PRO performance of the membrane was studied under various hydraulic pressures at the AL−FS orientation. The results reveal that the substrate with sponge-like structure and relatively dense inner surface can better withstand high pressure in PRO process. Two steps of cross-linking endowed the membrane with a smaller pore size on the outer surface that exhibits high rejection against various inorganic salts. The novel integral membrane can achieve a stable power density output around 4.3 W m−2 at 12 ~ 13 bar hydraulic pressure, using a real wastewater reverse osmosis (RO) retentate and 1.0 M sodium chloride as the feed and draw stream, correspondingly. This result demonstrates that the PRO operation in the AL−FS orientation (FO mode) offers a significant advantage over the AL−DS orientation (PRO mode) by eliminating the pretreatment of the feed water or/and other measures associated with membrane fouling control in the PRO mode. To implement the PRO operation with the AL−FS orientation, developing a robust membrane with an integral structure is critical. The newly developed integral hollow fiber membrane via chemical cross-linking presents the potential for PRO operation in the AL−FS orientation. NRF (Natl Research Foundation, S’pore) EDB (Economic Devt. Board, S’pore) Accepted version 2019-11-18T07:13:20Z 2019-12-06T16:01:21Z 2019-11-18T07:13:20Z 2019-12-06T16:01:21Z 2017 Journal Article Li, Y., Zhao, S., Setiawan, L., Zhang, L., & Wang, R. (2018). Integral hollow fiber membrane with chemical cross-linking for pressure retarded osmosis operated in the orientation of active layer facing feed solution. Journal of Membrane Science, 550, 163-172. doi:10.1016/j.memsci.2017.12.074 0376-7388 https://hdl.handle.net/10356/85314 http://hdl.handle.net/10220/50431 10.1016/j.memsci.2017.12.074 en Journal of Membrane Science © 2017 Elsevier B.V. All rights reserved. This paper was published in Journal of Membrane Science and is made available with permission of Elsevier B.V. 33 p. application/pdf
institution Nanyang Technological University
building NTU Library
country Singapore
collection DR-NTU
language English
topic Integral Membrane
Pressure Retarded Osmosis
Engineering::Environmental engineering::Water treatment
spellingShingle Integral Membrane
Pressure Retarded Osmosis
Engineering::Environmental engineering::Water treatment
Li, Ye
Zhao, Shanshan
Setiawan, Laurentia
Zhang, Lizhi
Wang, Rong
Integral hollow fiber membrane with chemical cross-linking for pressure retarded osmosis operated in the orientation of active layer facing feed solution
description Pressure retarded osmosis (PRO) is an innovative technique to yield osmotic energy. Nevertheless, the PRO performance is exacerbated by the severe membrane fouling occurring within the porous support. It is a potential alternative for sustainable power harvesting to change the membrane orientation from active layer facing draw solution (AL−DS) or PRO mode to active layer facing feed solution (AL−FS) or FO mode for a low-fouling propensity. A novel integral PRO hollow fiber membrane was developed in this work by phase inversion and followed with a facile cross-linking post-treatment. The structure and properties of the resultant membrane were systematically investigated using a series of characterization protocols. The PRO performance of the membrane was studied under various hydraulic pressures at the AL−FS orientation. The results reveal that the substrate with sponge-like structure and relatively dense inner surface can better withstand high pressure in PRO process. Two steps of cross-linking endowed the membrane with a smaller pore size on the outer surface that exhibits high rejection against various inorganic salts. The novel integral membrane can achieve a stable power density output around 4.3 W m−2 at 12 ~ 13 bar hydraulic pressure, using a real wastewater reverse osmosis (RO) retentate and 1.0 M sodium chloride as the feed and draw stream, correspondingly. This result demonstrates that the PRO operation in the AL−FS orientation (FO mode) offers a significant advantage over the AL−DS orientation (PRO mode) by eliminating the pretreatment of the feed water or/and other measures associated with membrane fouling control in the PRO mode. To implement the PRO operation with the AL−FS orientation, developing a robust membrane with an integral structure is critical. The newly developed integral hollow fiber membrane via chemical cross-linking presents the potential for PRO operation in the AL−FS orientation.
author2 School of Civil and Environmental Engineering
author_facet School of Civil and Environmental Engineering
Li, Ye
Zhao, Shanshan
Setiawan, Laurentia
Zhang, Lizhi
Wang, Rong
format Article
author Li, Ye
Zhao, Shanshan
Setiawan, Laurentia
Zhang, Lizhi
Wang, Rong
author_sort Li, Ye
title Integral hollow fiber membrane with chemical cross-linking for pressure retarded osmosis operated in the orientation of active layer facing feed solution
title_short Integral hollow fiber membrane with chemical cross-linking for pressure retarded osmosis operated in the orientation of active layer facing feed solution
title_full Integral hollow fiber membrane with chemical cross-linking for pressure retarded osmosis operated in the orientation of active layer facing feed solution
title_fullStr Integral hollow fiber membrane with chemical cross-linking for pressure retarded osmosis operated in the orientation of active layer facing feed solution
title_full_unstemmed Integral hollow fiber membrane with chemical cross-linking for pressure retarded osmosis operated in the orientation of active layer facing feed solution
title_sort integral hollow fiber membrane with chemical cross-linking for pressure retarded osmosis operated in the orientation of active layer facing feed solution
publishDate 2019
url https://hdl.handle.net/10356/85314
http://hdl.handle.net/10220/50431
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