Impacts of operating conditions and solution chemistry on osmotic membrane structure and performance

Handle URI:
http://hdl.handle.net/10754/598571
Title:
Impacts of operating conditions and solution chemistry on osmotic membrane structure and performance
Authors:
Wong, Mavis C.Y.; Martinez, Kristina; Ramon, Guy Z.; Hoek, Eric M.V.
Abstract:
Herein, we report on changes in the performance of a commercial cellulose triacetate (CTA) membrane, imparted by varied operating conditions and solution chemistries. Changes to feed and draw solution flow rate did not significantly alter the CTA membrane's water permeability, salt permeability, or membrane structural parameter when operated with the membrane skin layer facing the draw solution (PRO-mode). However, water and salt permeability increased with increasing feed or draw solution temperature, while the membrane structural parameter decreased with increasing draw solution, possibly due to changes in polymer intermolecular interactions. High ionic strength draw solutions may de-swell the CTA membrane via charge neutralization, which resulted in lower water permeability, higher salt permeability, and lower structural parameter. This observed trend was further exacerbated by the presence of divalent cations which tends to swell the polymer to a greater extent. Finally, the calculated CTA membrane's structural parameter was lower and less sensitive to external factors when operated in PRO-mode, but highly sensitive to the same factors when the skin layer faced the feed solution (FO-mode), presumably due to swelling/de-swelling of the saturated porous substructure by the draw solution. This is a first attempt aimed at systematically evaluating the changes in performance of the CTA membrane due to operating conditions and solution chemistry, shedding new insight into the possible advantages and disadvantages of this material in certain applications. © 2011 Elsevier B.V.
Citation:
Wong MCY, Martinez K, Ramon GZ, Hoek EMV (2012) Impacts of operating conditions and solution chemistry on osmotic membrane structure and performance. Desalination 287: 340–349. Available: http://dx.doi.org/10.1016/j.desal.2011.10.013.
Publisher:
Elsevier BV
Journal:
Desalination
KAUST Grant Number:
KUS-C1-018-02
Issue Date:
Feb-2012
DOI:
10.1016/j.desal.2011.10.013
Type:
Article
ISSN:
0011-9164
Sponsors:
The work presented in this publication was supported by Award No. KUS-C1-018-02, made by King Abdullah University of Science and Technology (KAUST). GZR was supported by a Vaadia-BARD Post-doctoral Fellowship Award No. FI-435-2010 from BARD, The United States-Israel Binational Agricultural Research and Development Fund.
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Full metadata record

DC FieldValue Language
dc.contributor.authorWong, Mavis C.Y.en
dc.contributor.authorMartinez, Kristinaen
dc.contributor.authorRamon, Guy Z.en
dc.contributor.authorHoek, Eric M.V.en
dc.date.accessioned2016-02-25T13:32:21Zen
dc.date.available2016-02-25T13:32:21Zen
dc.date.issued2012-02en
dc.identifier.citationWong MCY, Martinez K, Ramon GZ, Hoek EMV (2012) Impacts of operating conditions and solution chemistry on osmotic membrane structure and performance. Desalination 287: 340–349. Available: http://dx.doi.org/10.1016/j.desal.2011.10.013.en
dc.identifier.issn0011-9164en
dc.identifier.doi10.1016/j.desal.2011.10.013en
dc.identifier.urihttp://hdl.handle.net/10754/598571en
dc.description.abstractHerein, we report on changes in the performance of a commercial cellulose triacetate (CTA) membrane, imparted by varied operating conditions and solution chemistries. Changes to feed and draw solution flow rate did not significantly alter the CTA membrane's water permeability, salt permeability, or membrane structural parameter when operated with the membrane skin layer facing the draw solution (PRO-mode). However, water and salt permeability increased with increasing feed or draw solution temperature, while the membrane structural parameter decreased with increasing draw solution, possibly due to changes in polymer intermolecular interactions. High ionic strength draw solutions may de-swell the CTA membrane via charge neutralization, which resulted in lower water permeability, higher salt permeability, and lower structural parameter. This observed trend was further exacerbated by the presence of divalent cations which tends to swell the polymer to a greater extent. Finally, the calculated CTA membrane's structural parameter was lower and less sensitive to external factors when operated in PRO-mode, but highly sensitive to the same factors when the skin layer faced the feed solution (FO-mode), presumably due to swelling/de-swelling of the saturated porous substructure by the draw solution. This is a first attempt aimed at systematically evaluating the changes in performance of the CTA membrane due to operating conditions and solution chemistry, shedding new insight into the possible advantages and disadvantages of this material in certain applications. © 2011 Elsevier B.V.en
dc.description.sponsorshipThe work presented in this publication was supported by Award No. KUS-C1-018-02, made by King Abdullah University of Science and Technology (KAUST). GZR was supported by a Vaadia-BARD Post-doctoral Fellowship Award No. FI-435-2010 from BARD, The United States-Israel Binational Agricultural Research and Development Fund.en
dc.publisherElsevier BVen
dc.subjectCellulose triacetateen
dc.subjectConcentration polarizationen
dc.subjectForward osmosisen
dc.subjectMembrane structural parameteren
dc.titleImpacts of operating conditions and solution chemistry on osmotic membrane structure and performanceen
dc.typeArticleen
dc.identifier.journalDesalinationen
dc.contributor.institutionUniversity of California, Los Angeles, Los Angeles, United Statesen
dc.contributor.institutionPrinceton University, Princeton, United Statesen
kaust.grant.numberKUS-C1-018-02en
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