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Article: Influences of extracellular polymeric substances (EPS) on the characteristics of activated sludge under non-steady-state conditions

TitleInfluences of extracellular polymeric substances (EPS) on the characteristics of activated sludge under non-steady-state conditions
Authors
KeywordsActivated Sludge
Bioflocculation
Dewaterability
Extracellular Polymeric Substances (Eps)
Non-Steady-State Condition
Sedimentation
Issue Date2009
PublisherElsevier Ltd. The Journal's web site is located at http://www.elsevier.com/locate/procbio
Citation
Process Biochemistry, 2009, v. 44 n. 1, p. 91-96 How to Cite?
AbstractLaboratory experiments were carried out on activated sludge (AS) to investigate the correlations between the content of extracellular polymeric substances (EPS) and the performance of biosolids-water separation, including sludge flocculation, sedimentation, compression, and dewatering, under non-steady-state conditions. On three stabilized AS reactors changes were made in sludge retention time (SRT), substrate composition, and loading rate, respectively, to bring about unstable operation to the reactors. A two-step heating method was used to extract from the sludge the easily extractable EPS, or loosely bound EPS (LB-EPS), and tightly bound EPS (TB-EPS), respectively. The experimental results demonstrate dynamic changes in sludge characteristic and EPS production under the non-steady-state conditions. During the early phase of transition after a change was imposed, the sludge became generally worse in flocculation, compressibility, and dewaterability. With the acclimatization of the biomass to the new process conditions, biosolids-water separation showed a general trend of improvement. Changes in AS process condition also resulted in considerable variations in EPS production. The change of the LB-EPS content appeared to be more significant than that of the TB-EPS. Throughout the non-steady-state operation, the sludge flocculating behavior, settleability, compressibility, and dewaterability had a positive correlation with the LB-EPS content; however, no correlation could be found between these properties and the TB-EPS content. The results suggest that although EPS is essential to biofloc formation, excessive EPS in the form of LB-EPS would weaken cell attachment and deteriorate the AS floc structure, resulting in poor biosolids-water separation. © 2008 Elsevier Ltd. All rights reserved.
Persistent Identifierhttp://hdl.handle.net/10722/150482
ISSN
2015 Impact Factor: 2.529
2015 SCImago Journal Rankings: 0.937
ISI Accession Number ID
Funding AgencyGrant Number
Research Grants Council (RGC) of the Hong Kong SAR Government, ChinaHKU7114/04E
N-HKU737/04
Funding Information:

This research was supported by Grants HKU7114/04E and N-HKU737/04 from the Research Grants Council (RGC) of the Hong Kong SAR Government, China. The technical assistance of Mr. Keith C.H. Wong is highly appreciated.

References

 

DC FieldValueLanguage
dc.contributor.authorYang, Sfen_US
dc.contributor.authorLi, Xyen_US
dc.date.accessioned2012-06-26T06:05:05Z-
dc.date.available2012-06-26T06:05:05Z-
dc.date.issued2009en_US
dc.identifier.citationProcess Biochemistry, 2009, v. 44 n. 1, p. 91-96en_US
dc.identifier.issn1359-5113en_US
dc.identifier.urihttp://hdl.handle.net/10722/150482-
dc.description.abstractLaboratory experiments were carried out on activated sludge (AS) to investigate the correlations between the content of extracellular polymeric substances (EPS) and the performance of biosolids-water separation, including sludge flocculation, sedimentation, compression, and dewatering, under non-steady-state conditions. On three stabilized AS reactors changes were made in sludge retention time (SRT), substrate composition, and loading rate, respectively, to bring about unstable operation to the reactors. A two-step heating method was used to extract from the sludge the easily extractable EPS, or loosely bound EPS (LB-EPS), and tightly bound EPS (TB-EPS), respectively. The experimental results demonstrate dynamic changes in sludge characteristic and EPS production under the non-steady-state conditions. During the early phase of transition after a change was imposed, the sludge became generally worse in flocculation, compressibility, and dewaterability. With the acclimatization of the biomass to the new process conditions, biosolids-water separation showed a general trend of improvement. Changes in AS process condition also resulted in considerable variations in EPS production. The change of the LB-EPS content appeared to be more significant than that of the TB-EPS. Throughout the non-steady-state operation, the sludge flocculating behavior, settleability, compressibility, and dewaterability had a positive correlation with the LB-EPS content; however, no correlation could be found between these properties and the TB-EPS content. The results suggest that although EPS is essential to biofloc formation, excessive EPS in the form of LB-EPS would weaken cell attachment and deteriorate the AS floc structure, resulting in poor biosolids-water separation. © 2008 Elsevier Ltd. All rights reserved.en_US
dc.languageengen_US
dc.publisherElsevier Ltd. The Journal's web site is located at http://www.elsevier.com/locate/procbioen_US
dc.relation.ispartofProcess Biochemistryen_US
dc.rightsProcess Biochemistry. Copyright © Elsevier Ltd.-
dc.subjectActivated Sludgeen_US
dc.subjectBioflocculationen_US
dc.subjectDewaterabilityen_US
dc.subjectExtracellular Polymeric Substances (Eps)en_US
dc.subjectNon-Steady-State Conditionen_US
dc.subjectSedimentationen_US
dc.titleInfluences of extracellular polymeric substances (EPS) on the characteristics of activated sludge under non-steady-state conditionsen_US
dc.typeArticleen_US
dc.identifier.emailLi, Xy:xlia@hkucc.hku.hken_US
dc.identifier.authorityLi, Xy=rp00222en_US
dc.description.naturelink_to_subscribed_fulltexten_US
dc.identifier.doi10.1016/j.procbio.2008.09.010en_US
dc.identifier.scopuseid_2-s2.0-58049195666en_US
dc.identifier.hkuros164561-
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-58049195666&selection=ref&src=s&origin=recordpageen_US
dc.identifier.volume44en_US
dc.identifier.issue1en_US
dc.identifier.spage91en_US
dc.identifier.epage96en_US
dc.identifier.isiWOS:000262571700013-
dc.publisher.placeUnited Kingdomen_US
dc.identifier.scopusauthoridYang, Sf=7406949577en_US
dc.identifier.scopusauthoridLi, Xy=26642887900en_US

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