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Article: Settling velocities and permeabilities of microbial aggregates

TitleSettling velocities and permeabilities of microbial aggregates
Authors
KeywordsBiological floc
Fractal
Microbial aggregate
Particle
Permeability
Settling velocity
Issue Date2002
PublisherPergamon. The Journal's web site is located at http://www.elsevier.com/locate/watres
Citation
Water Research, 2002, v. 36 n. 12, p. 3110-3120 How to Cite?
AbstractThe hydrodynamics of microbial aggregates, including settling velocity and permeability features, were investigated through detailed settling experiments. Microbial aggregates ranging from 1.0 to 2.5mm were generated in a lab-scale sequencing batch reactor (SBR) and also collected from a full-scale activated sludge (AS) treatment process. An apparatus of vertically connected double settling columns, filled with solutions of different densities, was used to measure the settling velocities and thus to characterise the internal permeation of individual microbial aggregates. It was demonstrated that the microbial aggregates were highly porous and fractal. However, their settling velocities observed in deionised water, EDTA and NaCl solutions were only slightly faster than predicted by Stokes' law for identical but impermeable particles. The fluid collection efficiencies calculated from measured settling velocities were less than 0.10 for most microbial aggregates, which was much lower than those previously determined for non-biological aggregates of latex microspheres. It is suggested that microbial aggregates could have a largely reduced permeability, as the pores between the microorganisms in the aggregates may be clogged by the cell's exopolymeric material with the water retained. © 2002 Elsevier Science Ltd. All rights reserved.
Persistent Identifierhttp://hdl.handle.net/10722/70923
ISSN
2015 Impact Factor: 5.991
2015 SCImago Journal Rankings: 2.772
ISI Accession Number ID
References

 

DC FieldValueLanguage
dc.contributor.authorLi, XYen_HK
dc.contributor.authorYuan, Yen_HK
dc.date.accessioned2010-09-06T06:27:19Z-
dc.date.available2010-09-06T06:27:19Z-
dc.date.issued2002en_HK
dc.identifier.citationWater Research, 2002, v. 36 n. 12, p. 3110-3120en_HK
dc.identifier.issn0043-1354en_HK
dc.identifier.urihttp://hdl.handle.net/10722/70923-
dc.description.abstractThe hydrodynamics of microbial aggregates, including settling velocity and permeability features, were investigated through detailed settling experiments. Microbial aggregates ranging from 1.0 to 2.5mm were generated in a lab-scale sequencing batch reactor (SBR) and also collected from a full-scale activated sludge (AS) treatment process. An apparatus of vertically connected double settling columns, filled with solutions of different densities, was used to measure the settling velocities and thus to characterise the internal permeation of individual microbial aggregates. It was demonstrated that the microbial aggregates were highly porous and fractal. However, their settling velocities observed in deionised water, EDTA and NaCl solutions were only slightly faster than predicted by Stokes' law for identical but impermeable particles. The fluid collection efficiencies calculated from measured settling velocities were less than 0.10 for most microbial aggregates, which was much lower than those previously determined for non-biological aggregates of latex microspheres. It is suggested that microbial aggregates could have a largely reduced permeability, as the pores between the microorganisms in the aggregates may be clogged by the cell's exopolymeric material with the water retained. © 2002 Elsevier Science Ltd. All rights reserved.en_HK
dc.languageengen_HK
dc.publisherPergamon. The Journal's web site is located at http://www.elsevier.com/locate/watresen_HK
dc.relation.ispartofWater Researchen_HK
dc.subjectBiological flocen_HK
dc.subjectFractalen_HK
dc.subjectMicrobial aggregateen_HK
dc.subjectParticleen_HK
dc.subjectPermeabilityen_HK
dc.subjectSettling velocityen_HK
dc.titleSettling velocities and permeabilities of microbial aggregatesen_HK
dc.typeArticleen_HK
dc.identifier.openurlhttp://library.hku.hk:4550/resserv?sid=HKU:IR&issn=0043-1354&volume=36&issue=12&spage=3110&epage=3120&date=2002&atitle=Settling+velocities+and+permeabilities+of+microbial+aggregatesen_HK
dc.identifier.emailLi, XY:xlia@hkucc.hku.hken_HK
dc.identifier.authorityLi, XY=rp00222en_HK
dc.description.naturelink_to_subscribed_fulltext-
dc.identifier.doi10.1016/S0043-1354(01)00541-3en_HK
dc.identifier.pmid12171410-
dc.identifier.scopuseid_2-s2.0-0036088926en_HK
dc.identifier.hkuros68956en_HK
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-0036088926&selection=ref&src=s&origin=recordpageen_HK
dc.identifier.volume36en_HK
dc.identifier.issue12en_HK
dc.identifier.spage3110en_HK
dc.identifier.epage3120en_HK
dc.identifier.isiWOS:000177109900022-
dc.publisher.placeUnited Kingdomen_HK
dc.identifier.scopusauthoridLi, XY=26642887900en_HK
dc.identifier.scopusauthoridYuan, Y=36553559300en_HK

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