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Article: Fate of aerobic bacterial granules with fungal contamination under different organic loading conditions

TitleFate of aerobic bacterial granules with fungal contamination under different organic loading conditions
Authors
KeywordsAerobic granulation
Bacterial granules
Biological wastewater treatment
FISH-CLSM
Fungal granules
PCR-DGGE
Issue Date2010
PublisherPergamon. The Journal's web site is located at http://www.elsevier.com/locate/chemosphere
Citation
Chemosphere, 2010, v. 78 n. 5, p. 500-509 How to Cite?
AbstractAerobic sludge granulation is an attractive new technology for biological wastewater treatment. However, the instability of aerobic granules caused by fungal growth is still one of the main problems encountered in granular bioreactors. In this study, laboratory experiments were conducted to investigate the fate and transformation of aerobic granules under different organic loading conditions. Bacterial granules (2-3 mm) in a poor condition with fungi-like black filamentous growth were seeded into two 1 L batch reactors. After more than 100 d of cultivation, the small seed granules in the two reactors had grown into two different types of large granules (>20 mm) with different and unique morphological features. In reactor R1 with a high organic loading rate of 2.0 g COD L-1 d-1, the black filaments mostly disappeared from the granules, and the dominance of rod-shaped bacteria was recovered. In contrast, at a low loading of 0.5 g COD L-1 d-1 in reactor R2, the filaments eventually became dominant in the black fungal granules. The bacteria in R1 granules had a unique web-like structure with large pores of a few hundred μm in size, which would allow for effective substrate and oxygen transport into the interior of the granules. DNA-based molecular analysis indicated the evolution of the bacterial population in R1 and that of the eukaryal community in R2. The experimental results suggest that a high loading rate can be an effective means of helping to control fungal bloom, recover bacterial domination and restore the stability of aerobic granules that suffer from fungal contamination. © 2009 Elsevier Ltd. All rights reserved.
Persistent Identifierhttp://hdl.handle.net/10722/124585
ISSN
2015 Impact Factor: 3.698
2015 SCImago Journal Rankings: 1.536
ISI Accession Number ID
Funding AgencyGrant Number
Research Grants Council (RGC) of the Hong Kong SAR GovernmentN-HKU737/04
HKU7144/E07
Natural Science Foundation of China50828802
Funding Information:

This research was supported by Grants N-HKU737/04 and HKU7144/E07 from the Research Grants Council (RGC) of the Hong Kong SAR Government and Grant 50828802 from the Natural Science Foundation of China. The technical assistance of Mr Keith C.H. Wong is highly appreciated.

References

 

DC FieldValueLanguage
dc.contributor.authorLi, Ajen_HK
dc.contributor.authorZhang, Ten_HK
dc.contributor.authorLi, Xyen_HK
dc.date.accessioned2010-10-31T10:42:42Z-
dc.date.available2010-10-31T10:42:42Z-
dc.date.issued2010en_HK
dc.identifier.citationChemosphere, 2010, v. 78 n. 5, p. 500-509en_HK
dc.identifier.issn0045-6535en_HK
dc.identifier.urihttp://hdl.handle.net/10722/124585-
dc.description.abstractAerobic sludge granulation is an attractive new technology for biological wastewater treatment. However, the instability of aerobic granules caused by fungal growth is still one of the main problems encountered in granular bioreactors. In this study, laboratory experiments were conducted to investigate the fate and transformation of aerobic granules under different organic loading conditions. Bacterial granules (2-3 mm) in a poor condition with fungi-like black filamentous growth were seeded into two 1 L batch reactors. After more than 100 d of cultivation, the small seed granules in the two reactors had grown into two different types of large granules (>20 mm) with different and unique morphological features. In reactor R1 with a high organic loading rate of 2.0 g COD L-1 d-1, the black filaments mostly disappeared from the granules, and the dominance of rod-shaped bacteria was recovered. In contrast, at a low loading of 0.5 g COD L-1 d-1 in reactor R2, the filaments eventually became dominant in the black fungal granules. The bacteria in R1 granules had a unique web-like structure with large pores of a few hundred μm in size, which would allow for effective substrate and oxygen transport into the interior of the granules. DNA-based molecular analysis indicated the evolution of the bacterial population in R1 and that of the eukaryal community in R2. The experimental results suggest that a high loading rate can be an effective means of helping to control fungal bloom, recover bacterial domination and restore the stability of aerobic granules that suffer from fungal contamination. © 2009 Elsevier Ltd. All rights reserved.en_HK
dc.languageengen_HK
dc.publisherPergamon. The Journal's web site is located at http://www.elsevier.com/locate/chemosphereen_HK
dc.relation.ispartofChemosphereen_HK
dc.rightsCreative Commons: Attribution 3.0 Hong Kong License-
dc.subjectAerobic granulationen_HK
dc.subjectBacterial granulesen_HK
dc.subjectBiological wastewater treatmenten_HK
dc.subjectFISH-CLSMen_HK
dc.subjectFungal granulesen_HK
dc.subjectPCR-DGGEen_HK
dc.titleFate of aerobic bacterial granules with fungal contamination under different organic loading conditionsen_HK
dc.typeArticleen_HK
dc.identifier.openurlhttp://library.hku.hk:4550/resserv?sid=HKU:IR&issn=0045-6535&volume=78&issue=5&spage=500&epage=509&date=2010&atitle=Fate+of+the+aerobic+bacterial+granules+with+fungal+contamination+under+different+organic+loading+conditionsen_HK
dc.identifier.emailZhang, T:zhangt@hkucc.hku.hken_HK
dc.identifier.emailLi, Xy:xlia@hkucc.hku.hken_HK
dc.identifier.authorityZhang, T=rp00211en_HK
dc.identifier.authorityLi, Xy=rp00222en_HK
dc.description.naturepostprint-
dc.identifier.doi10.1016/j.chemosphere.2009.11.040en_HK
dc.identifier.pmid20031190-
dc.identifier.scopuseid_2-s2.0-73049104136en_HK
dc.identifier.hkuros175524en_HK
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-73049104136&selection=ref&src=s&origin=recordpageen_HK
dc.identifier.volume78en_HK
dc.identifier.issue5en_HK
dc.identifier.spage500en_HK
dc.identifier.epage509en_HK
dc.identifier.isiWOS:000274370900002-
dc.publisher.placeUnited Kingdomen_HK
dc.identifier.scopusauthoridLi, Aj=24338209600en_HK
dc.identifier.scopusauthoridZhang, T=24470677400en_HK
dc.identifier.scopusauthoridLi, Xy=26642887900en_HK
dc.identifier.citeulike6480960-

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