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Article: Colloidal interactions and fouling of NF and RO membranes: A review

TitleColloidal interactions and fouling of NF and RO membranes: A review
Authors
KeywordsColloidal Fouling
Concentration Polarization
Critical Flux
Limiting Flux
Nanofiltration (Nf)
Reverse Osmosis (Ro)
Issue Date2011
PublisherElsevier BV. The Journal's web site is located at http://www.elsevier.com/locate/cis
Citation
Advances In Colloid And Interface Science, 2011, v. 164 n. 1-2, p. 126-143 How to Cite?
AbstractColloids are fine particles whose characteristic size falls within the rough size range of 1-1000 nm. In pressure-driven membrane systems, these fine particles have a strong tendency to foul the membranes, causing a significant loss in water permeability and often a deteriorated product water quality. There have been a large number of systematic studies on colloidal fouling of reverse osmosis (RO) and nanofiltration (NF) membranes in the last three decades, and the understanding of colloidal fouling has been significantly advanced. The current paper reviews the mechanisms and factors controlling colloidal fouling of both RO and NF membranes. Major colloidal foulants (including both rigid inorganic colloids and organic macromolecules) and their properties are summarized. The deposition of such colloidal particles on an RO or NF membrane forms a cake layer, which can adversely affect the membrane flux due to 1) the cake layer hydraulic resistance and/or 2) the cake-enhanced osmotic pressure. The effects of feedwater compositions, membrane properties, and hydrodynamic conditions are discussed in detail for inorganic colloids, natural organic matter, polysaccharides, and proteins. In general, these effects can be readily explained by considering the mass transfer near the membrane surface and the colloid-membrane (or colloid-colloid) interaction. The critical flux and limiting flux concepts, originally developed for colloidal fouling of porous membranes, are also applicable to RO and NF membranes. For small colloids (diameter ≪ 100 nm), the limiting flux can result from two different mechanisms: 1) the diffusion-solubility (gel formation) controlled mechanism and 2) the surface interaction controlled mechanism. The former mechanism probably dominates for concentrated solutions, while the latter mechanism may be more important for dilute solutions. Future research needs on RO and NF colloidal fouling are also identified in the current paper. © 2010 Elsevier B.V. All rights reserved.
Persistent Identifierhttp://hdl.handle.net/10722/185400
ISSN
2015 Impact Factor: 7.813
2015 SCImago Journal Rankings: 2.314
ISI Accession Number ID
References

 

DC FieldValueLanguage
dc.contributor.authorTang, CYen_US
dc.contributor.authorChong, THen_US
dc.contributor.authorFane, AGen_US
dc.date.accessioned2013-07-30T07:32:16Z-
dc.date.available2013-07-30T07:32:16Z-
dc.date.issued2011en_US
dc.identifier.citationAdvances In Colloid And Interface Science, 2011, v. 164 n. 1-2, p. 126-143en_US
dc.identifier.issn0001-8686en_US
dc.identifier.urihttp://hdl.handle.net/10722/185400-
dc.description.abstractColloids are fine particles whose characteristic size falls within the rough size range of 1-1000 nm. In pressure-driven membrane systems, these fine particles have a strong tendency to foul the membranes, causing a significant loss in water permeability and often a deteriorated product water quality. There have been a large number of systematic studies on colloidal fouling of reverse osmosis (RO) and nanofiltration (NF) membranes in the last three decades, and the understanding of colloidal fouling has been significantly advanced. The current paper reviews the mechanisms and factors controlling colloidal fouling of both RO and NF membranes. Major colloidal foulants (including both rigid inorganic colloids and organic macromolecules) and their properties are summarized. The deposition of such colloidal particles on an RO or NF membrane forms a cake layer, which can adversely affect the membrane flux due to 1) the cake layer hydraulic resistance and/or 2) the cake-enhanced osmotic pressure. The effects of feedwater compositions, membrane properties, and hydrodynamic conditions are discussed in detail for inorganic colloids, natural organic matter, polysaccharides, and proteins. In general, these effects can be readily explained by considering the mass transfer near the membrane surface and the colloid-membrane (or colloid-colloid) interaction. The critical flux and limiting flux concepts, originally developed for colloidal fouling of porous membranes, are also applicable to RO and NF membranes. For small colloids (diameter ≪ 100 nm), the limiting flux can result from two different mechanisms: 1) the diffusion-solubility (gel formation) controlled mechanism and 2) the surface interaction controlled mechanism. The former mechanism probably dominates for concentrated solutions, while the latter mechanism may be more important for dilute solutions. Future research needs on RO and NF colloidal fouling are also identified in the current paper. © 2010 Elsevier B.V. All rights reserved.en_US
dc.languageengen_US
dc.publisherElsevier BV. The Journal's web site is located at http://www.elsevier.com/locate/cisen_US
dc.relation.ispartofAdvances in Colloid and Interface Scienceen_US
dc.subjectColloidal Foulingen_US
dc.subjectConcentration Polarizationen_US
dc.subjectCritical Fluxen_US
dc.subjectLimiting Fluxen_US
dc.subjectNanofiltration (Nf)en_US
dc.subjectReverse Osmosis (Ro)en_US
dc.titleColloidal interactions and fouling of NF and RO membranes: A reviewen_US
dc.typeArticleen_US
dc.identifier.emailTang, CY: tangc@hku.hken_US
dc.identifier.authorityTang, CY=rp01765en_US
dc.description.naturelink_to_subscribed_fulltexten_US
dc.identifier.doi10.1016/j.cis.2010.10.007en_US
dc.identifier.pmid21094487-
dc.identifier.scopuseid_2-s2.0-79955472213en_US
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-79955472213&selection=ref&src=s&origin=recordpageen_US
dc.identifier.volume164en_US
dc.identifier.issue1-2en_US
dc.identifier.spage126en_US
dc.identifier.epage143en_US
dc.identifier.isiWOS:000291421300011-
dc.publisher.placeNetherlandsen_US
dc.identifier.scopusauthoridTang, CY=35489259800en_US
dc.identifier.scopusauthoridChong, TH=15135067400en_US
dc.identifier.scopusauthoridFane, AG=35593963600en_US

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