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Title: Gypsum scaling and membrane integrity of osmotically driven membranes: The effect of membrane materials and operating conditions
Authors: Zhang, Minmin
Wang, Yi-Ning
Järvelä, Eliisa
Wei, Jing
Kyllönen, Hanna
Wang, Rong
Tang, Chuyang Y.
Keywords: DRNTU::Engineering::Environmental engineering::Water treatment
Issue Date: 2016
Source: 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.
Series/Report no.: Desalination
Abstract: 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.
ISSN: 0011-9164
DOI: 10.1016/j.desal.2015.08.024
Schools: School of Civil and Environmental Engineering 
Research Centres: Singapore Membrane Technology Centre 
Rights: © 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: [].
Fulltext Permission: open
Fulltext Availability: With Fulltext
Appears in Collections:CEE Journal Articles

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