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Article: Effects of seed sludge properties and selective biomass discharge on aerobic sludge granulation

TitleEffects of seed sludge properties and selective biomass discharge on aerobic sludge granulation
Authors
KeywordsAerobic granulation
Microbial community
Settling velocity
Sludge property
Issue Date2010
PublisherElsevier BV. The Journal's web site is located at http://www.elsevier.com/locate/cej
Citation
Chemical Engineering Journal, 2010, v. 160 n. 1, p. 108-114 How to Cite?
AbstractThis study was carried out to investigate the effects of seed sludge properties and the selective sludge discharge method on aerobic granulation in biological wastewater treatment. Small-loose flocs and larger-denser flocs were separated from raw activated sludge by sedimentation in a settling column. The two types of sludge were used as seed biomass in two laboratory batch reactors for the granulation experiment. A fixed daily sludge discharge ratio of around 10% of slow-settling sludge was applied to the two reactors. The results showed that aerobic granules could be formed in the reactors from both seed sludge of different structural and settling properties. The initial washout of small-loose sludge flocs during the start-up of the bioreactors did not appear to be a crucial factor for granulation. The key operating parameter was the daily discharge of relatively slow-settling biomass from the reactors. PCR-DGGE analysis showed insignificant differences between the bacterial communities of the mature granular sludge in the two reactors. It implied that continuous discharge of small and slow-settling flocs removed these competitors for substrate uptake from the system and hence made the substrate more available for large and compact flocs and granules. This selective sludge discharge facilitated the growth and accumulation of denser sludge in the reactor, leading to complete granulation. © 2010 Elsevier B.V. All rights reserved.
Persistent Identifierhttp://hdl.handle.net/10722/129137
ISSN
2015 Impact Factor: 5.31
2015 SCImago Journal Rankings: 1.743
ISI Accession Number ID
Funding AgencyGrant Number
Research Grants Council (RGC) of the Hong Kong SAR GovernmentHKU7144/E07
National Natural Science Foundation of China50828802
Funding Information:

This research was supported by grant HKU7144/E07 from the Research Grants Council (RGC) of the Hong Kong SAR Government and grant 50828802 from the National Natural Science Foundation of China. The technical assistance of Mr. Keith C.H. Wong is highly appreciated.

References

 

DC FieldValueLanguage
dc.contributor.authorSheng, Gpen_HK
dc.contributor.authorLi, Ajen_HK
dc.contributor.authorLi, Xyen_HK
dc.contributor.authorYu, Hqen_HK
dc.date.accessioned2010-12-23T08:32:54Z-
dc.date.available2010-12-23T08:32:54Z-
dc.date.issued2010en_HK
dc.identifier.citationChemical Engineering Journal, 2010, v. 160 n. 1, p. 108-114en_HK
dc.identifier.issn1385-8947en_HK
dc.identifier.urihttp://hdl.handle.net/10722/129137-
dc.description.abstractThis study was carried out to investigate the effects of seed sludge properties and the selective sludge discharge method on aerobic granulation in biological wastewater treatment. Small-loose flocs and larger-denser flocs were separated from raw activated sludge by sedimentation in a settling column. The two types of sludge were used as seed biomass in two laboratory batch reactors for the granulation experiment. A fixed daily sludge discharge ratio of around 10% of slow-settling sludge was applied to the two reactors. The results showed that aerobic granules could be formed in the reactors from both seed sludge of different structural and settling properties. The initial washout of small-loose sludge flocs during the start-up of the bioreactors did not appear to be a crucial factor for granulation. The key operating parameter was the daily discharge of relatively slow-settling biomass from the reactors. PCR-DGGE analysis showed insignificant differences between the bacterial communities of the mature granular sludge in the two reactors. It implied that continuous discharge of small and slow-settling flocs removed these competitors for substrate uptake from the system and hence made the substrate more available for large and compact flocs and granules. This selective sludge discharge facilitated the growth and accumulation of denser sludge in the reactor, leading to complete granulation. © 2010 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/cejen_HK
dc.relation.ispartofChemical Engineering Journalen_HK
dc.subjectAerobic granulationen_HK
dc.subjectMicrobial communityen_HK
dc.subjectSettling velocityen_HK
dc.subjectSludge propertyen_HK
dc.titleEffects of seed sludge properties and selective biomass discharge on aerobic sludge granulationen_HK
dc.typeArticleen_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.cej.2010.03.017en_HK
dc.identifier.scopuseid_2-s2.0-77951119213en_HK
dc.identifier.hkuros178453en_US
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-77951119213&selection=ref&src=s&origin=recordpageen_HK
dc.identifier.volume160en_HK
dc.identifier.issue1en_HK
dc.identifier.spage108en_HK
dc.identifier.epage114en_HK
dc.identifier.isiWOS:000278171000016-
dc.publisher.placeNetherlandsen_HK
dc.identifier.scopusauthoridSheng, Gp=34573573700en_HK
dc.identifier.scopusauthoridLi, Aj=24338209600en_HK
dc.identifier.scopusauthoridLi, Xy=26642887900en_HK
dc.identifier.scopusauthoridYu, Hq=13008678100en_HK
dc.identifier.citeulike6869252-

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