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Article: Stability of sludge flocs under shear conditions

TitleStability of sludge flocs under shear conditions
Authors
KeywordsAerobic sludge
Anaerobic sludge
Shear sensitivity
Sludge flocs
Stability
Surface characteristics
Issue Date2008
PublisherElsevier BV. The Journal's web site is located at http://www.elsevier.com/locate/bej
Citation
Biochemical Engineering Journal, 2008, v. 38 n. 3, p. 302-308 How to Cite?
AbstractThe shear stability and surface characteristics of aerobic and anaerobic flocs that are formed in biological wastewater treatment processes were investigated. The aerobic flocs of activated sludge were found to be more stable during the shear test, with a low shear sensitivity of 0.032, than the anaerobic flocs of sludge digestion, which had a higher shear sensitivity of 0.088. In addition, the surface characteristics of the sludge flocs, such as hydrophobicity, surface charge and fractal dimension, changed rather differently for the aerobic and anaerobic flocs during the shear tests. The significant changes took place in the first 30 min when the flocs were exposed to an elevated shear and little change was observed in the later stages of the shear tests. For quantitative description on the concentration of small primary particles in sludge solution, a modified adhesion-erosion model was used to describe the stability of the sludge flocs under shear conditions. The modification takes into account the effect of Brownian motion on particle dynamics in a sludge suspension, which effectively extends the application of the model to systems with a low shear intensity. © 2007 Elsevier B.V. All rights reserved.
Persistent Identifierhttp://hdl.handle.net/10722/70967
ISSN
2015 Impact Factor: 2.463
2015 SCImago Journal Rankings: 0.973
ISI Accession Number ID
References

 

DC FieldValueLanguage
dc.contributor.authorSheng, GPen_HK
dc.contributor.authorYu, HQen_HK
dc.contributor.authorLi, XYen_HK
dc.date.accessioned2010-09-06T06:27:42Z-
dc.date.available2010-09-06T06:27:42Z-
dc.date.issued2008en_HK
dc.identifier.citationBiochemical Engineering Journal, 2008, v. 38 n. 3, p. 302-308en_HK
dc.identifier.issn1369-703Xen_HK
dc.identifier.urihttp://hdl.handle.net/10722/70967-
dc.description.abstractThe shear stability and surface characteristics of aerobic and anaerobic flocs that are formed in biological wastewater treatment processes were investigated. The aerobic flocs of activated sludge were found to be more stable during the shear test, with a low shear sensitivity of 0.032, than the anaerobic flocs of sludge digestion, which had a higher shear sensitivity of 0.088. In addition, the surface characteristics of the sludge flocs, such as hydrophobicity, surface charge and fractal dimension, changed rather differently for the aerobic and anaerobic flocs during the shear tests. The significant changes took place in the first 30 min when the flocs were exposed to an elevated shear and little change was observed in the later stages of the shear tests. For quantitative description on the concentration of small primary particles in sludge solution, a modified adhesion-erosion model was used to describe the stability of the sludge flocs under shear conditions. The modification takes into account the effect of Brownian motion on particle dynamics in a sludge suspension, which effectively extends the application of the model to systems with a low shear intensity. © 2007 Elsevier B.V. All rights reserved.en_HK
dc.languageengen_HK
dc.publisherElsevier BV. The Journal's web site is located at http://www.elsevier.com/locate/bejen_HK
dc.relation.ispartofBiochemical Engineering Journalen_HK
dc.rightsBiochemical Engineering Journal. Copyright © Elsevier BV.en_HK
dc.subjectAerobic sludgeen_HK
dc.subjectAnaerobic sludgeen_HK
dc.subjectShear sensitivityen_HK
dc.subjectSludge flocsen_HK
dc.subjectStabilityen_HK
dc.subjectSurface characteristicsen_HK
dc.titleStability of sludge flocs under shear conditionsen_HK
dc.typeArticleen_HK
dc.identifier.openurlhttp://library.hku.hk:4550/resserv?sid=HKU:IR&issn=1369-703X&volume=38&spage=302&epage=308&date=2008&atitle=Stability+of+sludge+flocs+under+shear+conditionsen_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/j.bej.2007.07.026en_HK
dc.identifier.scopuseid_2-s2.0-38849113318en_HK
dc.identifier.hkuros149602en_HK
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-38849113318&selection=ref&src=s&origin=recordpageen_HK
dc.identifier.volume38en_HK
dc.identifier.issue3en_HK
dc.identifier.spage302en_HK
dc.identifier.epage308en_HK
dc.identifier.isiWOS:000253700400004-
dc.publisher.placeNetherlandsen_HK
dc.identifier.scopusauthoridSheng, GP=34573573700en_HK
dc.identifier.scopusauthoridYu, HQ=13008678100en_HK
dc.identifier.scopusauthoridLi, XY=26642887900en_HK

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