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Article: Impact of gel layer formation on colloid retention in membrane filtration processes

TitleImpact of gel layer formation on colloid retention in membrane filtration processes
Authors
KeywordsConcentration polarization (CP)
Filterability
Fouling mechanism
Gel layer structure
Stirred cell
Issue Date2008
PublisherElsevier BV. The Journal's web site is located at http://www.elsevier.com/locate/memsci
Citation
Journal Of Membrane Science, 2008, v. 325 n. 1, p. 486-494 How to Cite?
AbstractColloidal particles in the feed streams of membrane filtration processes control membrane fouling rate in many instances. In this study, the non-gelling colloidal Na-alginate and the gelling colloidal Ca-alginate are employed to investigate the significance of gel layer formation in membrane filtration processes in terms of contribution to membrane fouling and supplementary impurity removal. The results show that contribution of colloidal particles to membrane fouling depends on the gelling propensity of the colloids and the operational mode (constant pressure or constant flux) implemented. A small dose of either Na-alginate or Ca-alginate was found to greatly increase membrane fouling rate during constant pressure filtration. Both the resistance to removal by application of shear and the lower susceptibility of the concentration polarization layer to shear resulted in more severe fouling during constant flux filtration in the presence of Ca-alginate assemblages than in the presence of Na-alginate. Apparent channel sizes of the Ca-alginate gel layer were calculated from the material properties of the fouling layer. Incomplete catalase retention highlighted the likely heterogeneity in size of liquid transport pathways. Adsorption also contributed to the trapping of colloidal particles according to the retention behaviour of BSA by the Ca-alginate gel layer. Gel layer formation propensity should be seriously considered for the operation of membrane filtration processes. Two simple methods based on (i) a permeability recovery experiment and (ii) comparison of dead-end filtration behaviour with and without shear application are proposed for evaluation of the gelling propensity of colloidal dispersions. © 2008 Elsevier B.V. All rights reserved.
Persistent Identifierhttp://hdl.handle.net/10722/132402
ISSN
2015 Impact Factor: 5.557
2015 SCImago Journal Rankings: 2.042
ISI Accession Number ID
References

 

DC FieldValueLanguage
dc.contributor.authorWang, XMen_HK
dc.contributor.authorWaite, TDen_HK
dc.date.accessioned2011-03-28T09:24:09Z-
dc.date.available2011-03-28T09:24:09Z-
dc.date.issued2008en_HK
dc.identifier.citationJournal Of Membrane Science, 2008, v. 325 n. 1, p. 486-494en_HK
dc.identifier.issn0376-7388en_HK
dc.identifier.urihttp://hdl.handle.net/10722/132402-
dc.description.abstractColloidal particles in the feed streams of membrane filtration processes control membrane fouling rate in many instances. In this study, the non-gelling colloidal Na-alginate and the gelling colloidal Ca-alginate are employed to investigate the significance of gel layer formation in membrane filtration processes in terms of contribution to membrane fouling and supplementary impurity removal. The results show that contribution of colloidal particles to membrane fouling depends on the gelling propensity of the colloids and the operational mode (constant pressure or constant flux) implemented. A small dose of either Na-alginate or Ca-alginate was found to greatly increase membrane fouling rate during constant pressure filtration. Both the resistance to removal by application of shear and the lower susceptibility of the concentration polarization layer to shear resulted in more severe fouling during constant flux filtration in the presence of Ca-alginate assemblages than in the presence of Na-alginate. Apparent channel sizes of the Ca-alginate gel layer were calculated from the material properties of the fouling layer. Incomplete catalase retention highlighted the likely heterogeneity in size of liquid transport pathways. Adsorption also contributed to the trapping of colloidal particles according to the retention behaviour of BSA by the Ca-alginate gel layer. Gel layer formation propensity should be seriously considered for the operation of membrane filtration processes. Two simple methods based on (i) a permeability recovery experiment and (ii) comparison of dead-end filtration behaviour with and without shear application are proposed for evaluation of the gelling propensity of colloidal dispersions. © 2008 Elsevier B.V. All rights reserved.en_HK
dc.languageengen_US
dc.publisherElsevier BV. The Journal's web site is located at http://www.elsevier.com/locate/memscien_HK
dc.relation.ispartofJournal of Membrane Scienceen_HK
dc.subjectConcentration polarization (CP)en_HK
dc.subjectFilterabilityen_HK
dc.subjectFouling mechanismen_HK
dc.subjectGel layer structureen_HK
dc.subjectStirred cellen_HK
dc.titleImpact of gel layer formation on colloid retention in membrane filtration processesen_HK
dc.typeArticleen_HK
dc.identifier.emailWang, XM: wangxm@hku.hken_HK
dc.identifier.authorityWang, XM=rp01452en_HK
dc.description.naturelink_to_subscribed_fulltexten_US
dc.identifier.doi10.1016/j.memsci.2008.08.016en_HK
dc.identifier.scopuseid_2-s2.0-53249151514en_HK
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-53249151514&selection=ref&src=s&origin=recordpageen_HK
dc.identifier.volume325en_HK
dc.identifier.issue1en_HK
dc.identifier.spage486en_HK
dc.identifier.epage494en_HK
dc.identifier.isiWOS:000262946700060-
dc.publisher.placeNetherlandsen_HK
dc.identifier.scopusauthoridWang, XM=23092524200en_HK
dc.identifier.scopusauthoridWaite, TD=7004869232en_HK

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