Evaluation of air gap membrane distillation process running under sub-atmospheric conditions: Experimental and simulation studies

Handle URI:
http://hdl.handle.net/10754/550420
Title:
Evaluation of air gap membrane distillation process running under sub-atmospheric conditions: Experimental and simulation studies
Authors:
Alsaadi, Ahmad S.; Francis, Lijo; Maab, Husnul; Amy, Gary L.; Ghaffour, Noreddine ( 0000-0003-2095-4736 )
Abstract:
The importance of removing non-condensable gases from air gap membrane distillation (AGMD) modules in improving the water vapor flux is presented in this paper. Additionally, a previously developed AGMD mathematical model is used to predict to the degree of flux enhancement under sub-atmospheric pressure conditions. Since the mathematical model prediction is expected to be very sensitive to membrane distillation (MD) membrane resistance when the mass diffusion resistance is eliminated, the permeability of the membrane was carefully measured with two different methods (gas permeance test and vacuum MD permeability test). The mathematical model prediction was found to highly agree with the experimental data, which showed that the removal of non-condensable gases increased the flux by more than three-fold when the gap pressure was maintained at the saturation pressure of the feed temperature. The importance of staging the sub-atmospheric AGMD process and how this could give better control over the gap pressure as the feed temperature decreases are also highlighted in this paper. The effect of staging on the sub-atmospheric AGMD flux and its relation to membrane capital cost are briefly discussed.
KAUST Department:
Water Desalination and Reuse Research Center (WDRC)
Citation:
Ahmad S. Alsaadi, Lijo Francis, Husnul Maab, Gary L. Amy, Noreddine Ghaffour, Evaluation of air gap membrane distillation process running under sub-atmospheric conditions: Experimental and simulation studies, Journal of Membrane Science, http://dx.doi.org/10.1016/j.memsci.2015.04.008
Publisher:
Elsevier BV
Journal:
Journal of Membrane Science
Issue Date:
16-Apr-2015
DOI:
10.1016/j.memsci.2015.04.008
Type:
Article
ISSN:
03767388
Additional Links:
http://linkinghub.elsevier.com/retrieve/pii/S0376738815003129
Appears in Collections:
Articles; Water Desalination and Reuse Research Center (WDRC)

Full metadata record

DC FieldValue Language
dc.contributor.authorAlsaadi, Ahmad S.en
dc.contributor.authorFrancis, Lijoen
dc.contributor.authorMaab, Husnulen
dc.contributor.authorAmy, Gary L.en
dc.contributor.authorGhaffour, Noreddineen
dc.date.accessioned2016-04-07T10:02:03Zen
dc.date.available2015-04-21T14:10:32Zen
dc.date.available2016-04-07T10:02:03Zen
dc.date.issued2015-04-16en
dc.identifier.citationAhmad S. Alsaadi, Lijo Francis, Husnul Maab, Gary L. Amy, Noreddine Ghaffour, Evaluation of air gap membrane distillation process running under sub-atmospheric conditions: Experimental and simulation studies, Journal of Membrane Science, http://dx.doi.org/10.1016/j.memsci.2015.04.008en
dc.identifier.issn03767388en
dc.identifier.doi10.1016/j.memsci.2015.04.008en
dc.identifier.urihttp://hdl.handle.net/10754/550420en
dc.description.abstractThe importance of removing non-condensable gases from air gap membrane distillation (AGMD) modules in improving the water vapor flux is presented in this paper. Additionally, a previously developed AGMD mathematical model is used to predict to the degree of flux enhancement under sub-atmospheric pressure conditions. Since the mathematical model prediction is expected to be very sensitive to membrane distillation (MD) membrane resistance when the mass diffusion resistance is eliminated, the permeability of the membrane was carefully measured with two different methods (gas permeance test and vacuum MD permeability test). The mathematical model prediction was found to highly agree with the experimental data, which showed that the removal of non-condensable gases increased the flux by more than three-fold when the gap pressure was maintained at the saturation pressure of the feed temperature. The importance of staging the sub-atmospheric AGMD process and how this could give better control over the gap pressure as the feed temperature decreases are also highlighted in this paper. The effect of staging on the sub-atmospheric AGMD flux and its relation to membrane capital cost are briefly discussed.en
dc.publisherElsevier BVen
dc.relation.urlhttp://linkinghub.elsevier.com/retrieve/pii/S0376738815003129en
dc.rightsNOTICE: this is the author’s version of a work that was accepted for publication in Journal of Membrane Science. Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be reflected in this document. Changes may have been made to this work since it was submitted for publication. A definitive version was subsequently published in Journal of Membrane Science, 16 April 2015. DOI: 10.1016/j.memsci.2015.04.008en
dc.subjectMembrane distillation (MD)en
dc.subjectAir gap widthen
dc.subjectHeat and mass transfer coefficientsen
dc.subjectSub-atmospheric pressureen
dc.subjectGas permeanceen
dc.titleEvaluation of air gap membrane distillation process running under sub-atmospheric conditions: Experimental and simulation studiesen
dc.typeArticleen
dc.contributor.departmentWater Desalination and Reuse Research Center (WDRC)en
dc.identifier.journalJournal of Membrane Scienceen
dc.eprint.versionPost-printen
kaust.authorAlsaadi, Ahmad Salemen
kaust.authorFrancis, Lijoen
kaust.authorMaab, Husnulen
kaust.authorAmy, Gary L.en
kaust.authorGhaffour, Noreddineen

Version History

VersionItem Editor Date Summary
2 10754/550420grenzdm2016-04-07 10:58:22.0Addition of accepted manuscript file received from Noreddine Ghaffour.
1 10754/550420.1wangh0e2015-04-21 15:10:32.0null
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