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Article: Gel layer formation and hollow fiber membrane filterability of polysaccharide dispersions

TitleGel layer formation and hollow fiber membrane filterability of polysaccharide dispersions
Authors
KeywordsFilterability
Filtration model
Gelation
Porosity
Solid fraction
Specific resistance
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. 322 n. 1, p. 204-213 How to Cite?
AbstractGel layer formation on the membrane surface during filtration plays a significant role in membrane fouling that, in many instances, controls water production and energy consumption in the treatment of waters and wastewaters. In this study, alginate is selected as a model of the polysaccharides prevalent in wastewaters which, on membrane filtration, may form a gel on the membrane surface which subsequently limits filtrate throughput. We show that over the range of the applied pressures of 11.7-135 kPa considered here, constant pressure ultrafiltration of alginate follows the behavior of cake filtration. The material properties of the alginate are determined by the employment of the previously developed steady-state filtration approach. The consolidation of the gel layer is found to be controlled by the hydraulic flow resistance rather than the rearrangement of particles. Under these conditions, it is valid to apply the derived material properties for the quantification of both constant pressure and constant flux filtration. The gel layer formed from alginate is very compressible and far from uniform over its depth. Within the range of the applied pressures, the gel layer is very porous with a water content of more than 96% but very low Darcy permeability of less than 1 × 10-17 m2. During hollow fiber membrane filtration, the local flux is neither uniform nor constant along the fiber length, resulting in non-uniformity of the growth rate, the average porosity and the thickness of the gel layer. The non-uniformity is most apparent at the start of filtration and then gradually diminishes as the gel layer builds up with ongoing filtration. © 2008 Elsevier B.V. All rights reserved.
Persistent Identifierhttp://hdl.handle.net/10722/132403
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.accessioned2011-03-28T09:24:10Z-
dc.date.available2011-03-28T09:24:10Z-
dc.date.issued2008en_HK
dc.identifier.citationJournal Of Membrane Science, 2008, v. 322 n. 1, p. 204-213en_HK
dc.identifier.issn0376-7388en_HK
dc.identifier.urihttp://hdl.handle.net/10722/132403-
dc.description.abstractGel layer formation on the membrane surface during filtration plays a significant role in membrane fouling that, in many instances, controls water production and energy consumption in the treatment of waters and wastewaters. In this study, alginate is selected as a model of the polysaccharides prevalent in wastewaters which, on membrane filtration, may form a gel on the membrane surface which subsequently limits filtrate throughput. We show that over the range of the applied pressures of 11.7-135 kPa considered here, constant pressure ultrafiltration of alginate follows the behavior of cake filtration. The material properties of the alginate are determined by the employment of the previously developed steady-state filtration approach. The consolidation of the gel layer is found to be controlled by the hydraulic flow resistance rather than the rearrangement of particles. Under these conditions, it is valid to apply the derived material properties for the quantification of both constant pressure and constant flux filtration. The gel layer formed from alginate is very compressible and far from uniform over its depth. Within the range of the applied pressures, the gel layer is very porous with a water content of more than 96% but very low Darcy permeability of less than 1 × 10-17 m2. During hollow fiber membrane filtration, the local flux is neither uniform nor constant along the fiber length, resulting in non-uniformity of the growth rate, the average porosity and the thickness of the gel layer. The non-uniformity is most apparent at the start of filtration and then gradually diminishes as the gel layer builds up with ongoing filtration. © 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.subjectFilterabilityen_HK
dc.subjectFiltration modelen_HK
dc.subjectGelationen_HK
dc.subjectPorosityen_HK
dc.subjectSolid fractionen_HK
dc.subjectSpecific resistanceen_HK
dc.titleGel layer formation and hollow fiber membrane filterability of polysaccharide dispersionsen_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.2008.05.033en_HK
dc.identifier.scopuseid_2-s2.0-53249086464en_HK
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-53249086464&selection=ref&src=s&origin=recordpageen_HK
dc.identifier.volume322en_HK
dc.identifier.issue1en_HK
dc.identifier.spage204en_HK
dc.identifier.epage213en_HK
dc.identifier.isiWOS:000259014400026-
dc.publisher.placeNetherlandsen_HK
dc.identifier.scopusauthoridWang, XM=23092524200en_HK
dc.identifier.scopusauthoridWaite, TD=7004869232en_HK

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