Gypsum scaling and membrane integrity of osmotically driven membranes: The effect of membrane materials and operating conditions

The emerging thin film composite (TFC) forward osmosis (FO) and pressure retarded osmosis (PRO) membranes generally have better separation properties compared with their cellulose triacetate (CTA) counterparts. Nevertheless, their scaling performance has been rarely reported. In the current study, t...

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Main Authors: Zhang, Minmin, Wang, Yi-Ning, Järvelä, Eliisa, Wei, Jing, Kyllönen, Hanna, Wang, Rong, Tang, Chuyang Y.
Other Authors: School of Civil and Environmental Engineering
Format: Article
Language:English
Published: 2015
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Online Access:https://hdl.handle.net/10356/80879
http://hdl.handle.net/10220/38875
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Institution: Nanyang Technological University
Language: English
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spelling sg-ntu-dr.10356-808792020-03-07T11:43:28Z Gypsum scaling and membrane integrity of osmotically driven membranes: The effect of membrane materials and operating conditions Zhang, Minmin Wang, Yi-Ning Järvelä, Eliisa Wei, Jing Kyllönen, Hanna Wang, Rong Tang, Chuyang Y. School of Civil and Environmental Engineering Singapore Membrane Technology Centre DRNTU::Engineering::Environmental engineering::Water treatment The emerging thin film composite (TFC) forward osmosis (FO) and pressure retarded osmosis (PRO) membranes generally have better separation properties compared with their cellulose triacetate (CTA) counterparts. Nevertheless, their scaling performance has been rarely reported. In the current study, the phenomenon of membrane integrity loss as a result of scaling is reported for the first time for osmotically driven membrane processes (ODMPs). The results show that the TFC membrane suffered marked flux reduction during the scaling in the active-layer-facing-feed-solution (AL-FS) orientation, accompanied with the severe damage of the membrane active layer. The membrane integrity loss is attributed to the scale formation and growth in the confined space between the membrane and the feed spacer. Compared with the CTA membrane, the TFC was more prone to scaling and membrane damage due to its unfavorable physiochemical properties (presence of Ca2+ binding sites and ridge-and-valley roughness). Although antiscalant addition was shown to be effective for scaling control in AL-FS, it was ineffective in the active-layer-facing-draw-solution orientation. The current study reveals the critical need for scaling control in ODMP processes with respect to the membrane integrity and flux stability. The results also have far-reaching implications for FO and PRO membrane design and process operation. MOE (Min. of Education, S’pore) Accepted version 2015-12-01T04:27:46Z 2019-12-06T14:16:29Z 2015-12-01T04:27:46Z 2019-12-06T14:16:29Z 2016 Journal Article Wang, Y.-N., Järvelä, E., Wei, J., Zhang, M., Kyllönen, H., Wang, R., et al. (2015). Gypsum scaling and membrane integrity of osmotically driven membranes: The effect of membrane materials and operating conditions. Desalination, 377, 1-10. 0011-9164 https://hdl.handle.net/10356/80879 http://hdl.handle.net/10220/38875 10.1016/j.desal.2015.08.024 en Desalination © 2015 Elsevier B.V. This is the author created version of a work that has been peer reviewed and accepted for publication by Desalination, Elsevier B.V. It incorporates referee’s comments but changes resulting from the publishing process, such as copyediting, structural formatting, may not be reflected in this document. The published version is available at: [http://dx.doi.org/10.1016/j.desal.2015.08.024]. 23 p. + figures and tables application/pdf application/pdf application/pdf
institution Nanyang Technological University
building NTU Library
country Singapore
collection DR-NTU
language English
topic DRNTU::Engineering::Environmental engineering::Water treatment
spellingShingle DRNTU::Engineering::Environmental engineering::Water treatment
Zhang, Minmin
Wang, Yi-Ning
Järvelä, Eliisa
Wei, Jing
Kyllönen, Hanna
Wang, Rong
Tang, Chuyang Y.
Gypsum scaling and membrane integrity of osmotically driven membranes: The effect of membrane materials and operating conditions
description The emerging thin film composite (TFC) forward osmosis (FO) and pressure retarded osmosis (PRO) membranes generally have better separation properties compared with their cellulose triacetate (CTA) counterparts. Nevertheless, their scaling performance has been rarely reported. In the current study, the phenomenon of membrane integrity loss as a result of scaling is reported for the first time for osmotically driven membrane processes (ODMPs). The results show that the TFC membrane suffered marked flux reduction during the scaling in the active-layer-facing-feed-solution (AL-FS) orientation, accompanied with the severe damage of the membrane active layer. The membrane integrity loss is attributed to the scale formation and growth in the confined space between the membrane and the feed spacer. Compared with the CTA membrane, the TFC was more prone to scaling and membrane damage due to its unfavorable physiochemical properties (presence of Ca2+ binding sites and ridge-and-valley roughness). Although antiscalant addition was shown to be effective for scaling control in AL-FS, it was ineffective in the active-layer-facing-draw-solution orientation. The current study reveals the critical need for scaling control in ODMP processes with respect to the membrane integrity and flux stability. The results also have far-reaching implications for FO and PRO membrane design and process operation.
author2 School of Civil and Environmental Engineering
author_facet School of Civil and Environmental Engineering
Zhang, Minmin
Wang, Yi-Ning
Järvelä, Eliisa
Wei, Jing
Kyllönen, Hanna
Wang, Rong
Tang, Chuyang Y.
format Article
author Zhang, Minmin
Wang, Yi-Ning
Järvelä, Eliisa
Wei, Jing
Kyllönen, Hanna
Wang, Rong
Tang, Chuyang Y.
author_sort Zhang, Minmin
title Gypsum scaling and membrane integrity of osmotically driven membranes: The effect of membrane materials and operating conditions
title_short Gypsum scaling and membrane integrity of osmotically driven membranes: The effect of membrane materials and operating conditions
title_full Gypsum scaling and membrane integrity of osmotically driven membranes: The effect of membrane materials and operating conditions
title_fullStr Gypsum scaling and membrane integrity of osmotically driven membranes: The effect of membrane materials and operating conditions
title_full_unstemmed Gypsum scaling and membrane integrity of osmotically driven membranes: The effect of membrane materials and operating conditions
title_sort gypsum scaling and membrane integrity of osmotically driven membranes: the effect of membrane materials and operating conditions
publishDate 2015
url https://hdl.handle.net/10356/80879
http://hdl.handle.net/10220/38875
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