Please use this identifier to cite or link to this item: https://scholarbank.nus.edu.sg/handle/10635/90452
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dc.titleUnderstanding of low osmotic efficiency in forward osmosis: Experiments and modeling
dc.contributor.authorSu, J.
dc.contributor.authorChung, T.-S.
dc.contributor.authorHelmer, B.J.
dc.contributor.authorde Wit, J.S.
dc.date.accessioned2014-10-09T07:05:26Z
dc.date.available2014-10-09T07:05:26Z
dc.date.issued2013-03-05
dc.identifier.citationSu, J., Chung, T.-S., Helmer, B.J., de Wit, J.S. (2013-03-05). Understanding of low osmotic efficiency in forward osmosis: Experiments and modeling. Desalination 313 : 156-165. ScholarBank@NUS Repository.
dc.identifier.issn00119164
dc.identifier.urihttp://scholarbank.nus.edu.sg/handle/10635/90452
dc.description.abstractThis study discloses the critical factors that result in the low osmotic efficiency in forward osmosis (FO). Specifically, dual-layer hollow fiber membranes are prepared with newly-synthesized cellulose acetate propionate (CAP) as the outer active layer and commercial cellulose acetate (CA) as the inner sublayer. By carefully analyzing the hollow fiber cross section images, the porosity of the sublayer is found to be nonuniformly distributed at different locations. Viewing the membrane matrix as three consecutive layers, i.e., the active layer, the sublayer and the interface between them, the draw solute concentration profiles within each layer, the osmotic pressure gradients across each layer, and the transport resistance of each layer are determined. One interesting observation is that the active layer of the CAP-CA hollow fibers creates much larger resistance than the interface and the sublayer, indicating that the low osmotic efficiency (i.e., low water flux) is mainly due to the low water permeability of the active layer while internal concentration polarization (ICP) within the sublayer is less important. For any membranes, the active layer-sublayer interface also creates certain transport resistance. These findings provide a valuable reference for the understanding of FO and the design of advanced FO membranes. © 2013 Elsevier B.V.
dc.description.urihttp://libproxy1.nus.edu.sg/login?url=http://dx.doi.org/10.1016/j.desal.2012.12.022
dc.sourceScopus
dc.subjectConcentration profile
dc.subjectForward osmosis
dc.subjectOsmotic efficiency
dc.subjectTransport resistance
dc.subjectWater flux
dc.typeArticle
dc.contributor.departmentCHEMICAL & BIOMOLECULAR ENGINEERING
dc.description.sourcetitleDesalination
dc.description.volume313
dc.description.page156-165
dc.description.codenDSLNA
dc.identifier.isiut000315702900019
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