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

dc.contributor.author Wang, XiaoMao en_US
dc.contributor.author Waite, T en_US
dc.date.accessioned 2021-11-25T14:13:41Z
dc.date.available 2021-11-25T14:13:41Z
dc.date.issued 2008 en_US
dc.description.abstract Colloidal 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_US
dc.identifier.issn 0376-7388 en_US
dc.identifier.uri http://hdl.handle.net/1959.4/42254
dc.language English
dc.language.iso EN en_US
dc.rights CC BY-NC-ND 3.0 en_US
dc.rights.uri https://creativecommons.org/licenses/by-nc-nd/3.0/au/ en_US
dc.source Legacy MARC en_US
dc.subject.other Microfiltration en_US
dc.subject.other Adsorption en_US
dc.subject.other Alginate en_US
dc.subject.other Calcium en_US
dc.subject.other Calcium en_US
dc.subject.other Calcium en_US
dc.subject.other Calcium en_US
dc.subject.other Calcium en_US
dc.subject.other Calcium en_US
dc.subject.other Calcium en_US
dc.subject.other Calcium en_US
dc.subject.other Calcium en_US
dc.subject.other Calcium en_US
dc.subject.other Calcium en_US
dc.subject.other Calcium en_US
dc.title Impact of gel layer formation on colloid retention in membrane filtration processes en_US
dc.type Journal Article en
dcterms.accessRights metadata only access
dspace.entity.type Publication en_US
unsw.accessRights.uri http://purl.org/coar/access_right/c_14cb
unsw.relation.faculty Engineering
unsw.relation.ispartofissue 1 en_US
unsw.relation.ispartofjournal Journal of Membrane Science en_US
unsw.relation.ispartofpagefrompageto 486-494 en_US
unsw.relation.ispartofvolume 325 en_US
unsw.relation.originalPublicationAffiliation Wang, XiaoMao, Civil & Environmental Engineering, Faculty of Engineering, UNSW en_US
unsw.relation.originalPublicationAffiliation Waite, T, Civil & Environmental Engineering, Faculty of Engineering, UNSW en_US
unsw.relation.school School of Civil and Environmental Engineering *
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