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Article: Granular activated carbon for aerobic sludge granulation in a bioreactor with a low-strength wastewater influent

TitleGranular activated carbon for aerobic sludge granulation in a bioreactor with a low-strength wastewater influent
Authors
KeywordsAerobic granulation
Granular activated carbon (GAC)
Low-strength wastewater
Microbial community
Sequencing batch reactor (SBR)
Wastewater treatment
Issue Date2011
PublisherPergamon. The Journal's web site is located at http://www.elsevier.com/locate/seppur
Citation
Separation And Purification Technology, 2011, v. 80 n. 2, p. 276-283 How to Cite?
AbstractAerobic sludge granulation is rather difficult or impossible for the treatment of low-strength wastewater. In this study, a novel technique involving granular activated carbon (GAC) was developed for rapid aerobic granulation under a low organic loading condition. Laboratory experiments were conducted with two sequencing batch reactors (SBRs) running side by side. One reactor had fine GAC added to the sludge mixture, and the other had no GAC added. A low-strength organic wastewater with a chemical oxygen demand (COD) concentration of only 200 mg/L was used as the influent to the SBRs. The morphology, physical properties, and bacterial community structure of the sludge in the two reactors were characterized and compared throughout the experiments. The results showed that granules could not be formed in the SBR without added GAC. However, complete granulation was achieved in the SBR with GAC addition. Selective discharge of slow settling sludge was also essential to the granulation process. Adding GAC to the seed sludge mixture, together with the selective discharge of small and loose sludge flocs, facilitated the retention and growth of bacterial cells on GAC in attached-growth mode, leading to complete granulation. In addition, the use of GAC produced aerobic granules with strong cores to help maintain the long-term stability of mature granules. With granulation, the solid-liquid separation property of the sludge was greatly improved. Once granules were formed, the granules were quite stable and GAC addition was no longer needed. Therefore, adding GAC is a simple and effective strategy to initiate granule formation for complete sludge granulation in bioreactors treating low-strength organic wastewater. © 2011 Elsevier B.V. All rights reserved.
Persistent Identifierhttp://hdl.handle.net/10722/137236
ISSN
2015 Impact Factor: 3.299
2015 SCImago Journal Rankings: 1.100
ISI Accession Number ID
Funding AgencyGrant Number
Research Grants Council (RGC)HKU7144/E07
University Grants Council (UGC) of the Hong Kong SAR GovernmentSEG_HKU10
Natural Science Foundation of China50828802
Funding Information:

This research was supported by Grants HKU7144/E07 from the Research Grants Council (RGC) and SEG_HKU10 from the University Grants Council (UGC) 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.

Grants

 

DC FieldValueLanguage
dc.contributor.authorLi, Ajen_HK
dc.contributor.authorLi, Xyen_HK
dc.contributor.authorYu, Hqen_HK
dc.date.accessioned2011-08-26T14:21:38Z-
dc.date.available2011-08-26T14:21:38Z-
dc.date.issued2011en_HK
dc.identifier.citationSeparation And Purification Technology, 2011, v. 80 n. 2, p. 276-283en_HK
dc.identifier.issn1383-5866en_HK
dc.identifier.urihttp://hdl.handle.net/10722/137236-
dc.description.abstractAerobic sludge granulation is rather difficult or impossible for the treatment of low-strength wastewater. In this study, a novel technique involving granular activated carbon (GAC) was developed for rapid aerobic granulation under a low organic loading condition. Laboratory experiments were conducted with two sequencing batch reactors (SBRs) running side by side. One reactor had fine GAC added to the sludge mixture, and the other had no GAC added. A low-strength organic wastewater with a chemical oxygen demand (COD) concentration of only 200 mg/L was used as the influent to the SBRs. The morphology, physical properties, and bacterial community structure of the sludge in the two reactors were characterized and compared throughout the experiments. The results showed that granules could not be formed in the SBR without added GAC. However, complete granulation was achieved in the SBR with GAC addition. Selective discharge of slow settling sludge was also essential to the granulation process. Adding GAC to the seed sludge mixture, together with the selective discharge of small and loose sludge flocs, facilitated the retention and growth of bacterial cells on GAC in attached-growth mode, leading to complete granulation. In addition, the use of GAC produced aerobic granules with strong cores to help maintain the long-term stability of mature granules. With granulation, the solid-liquid separation property of the sludge was greatly improved. Once granules were formed, the granules were quite stable and GAC addition was no longer needed. Therefore, adding GAC is a simple and effective strategy to initiate granule formation for complete sludge granulation in bioreactors treating low-strength organic wastewater. © 2011 Elsevier B.V. All rights reserved.en_HK
dc.languageengen_US
dc.publisherPergamon. The Journal's web site is located at http://www.elsevier.com/locate/seppuren_HK
dc.relation.ispartofSeparation and Purification Technologyen_HK
dc.rightsCreative Commons: Attribution 3.0 Hong Kong License-
dc.rightsNOTICE: this is the author’s version of a work that was accepted for publication in Separation and Purification Technology. Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be reflected in this document. Changes may have been made to this work since it was submitted for publication. A definitive version was subsequently published in Separation and Purification Technology, 2011, v. 80 n. 2, p. 276-283. DOI: http://dx.doi.org/10.1016/j.seppur.2011.05.006-
dc.subjectAerobic granulationen_HK
dc.subjectGranular activated carbon (GAC)en_HK
dc.subjectLow-strength wastewateren_HK
dc.subjectMicrobial communityen_HK
dc.subjectSequencing batch reactor (SBR)en_HK
dc.subjectWastewater treatmenten_HK
dc.titleGranular activated carbon for aerobic sludge granulation in a bioreactor with a low-strength wastewater influenten_HK
dc.typeArticleen_HK
dc.identifier.openurlhttp://library.hku.hk:4550/resserv?sid=HKU:IR&issn=1383-5866&volume=80&issue=2&spage=276&epage=283&date=2011&atitle=Granular+activated+carbon+for+aerobic+sludge+granulation+in+a+bioreactor+with+a+low-strength+wastewater+influent-
dc.identifier.emailLi, Xy:xlia@hkucc.hku.hken_HK
dc.identifier.authorityLi, Xy=rp00222en_HK
dc.description.naturepostprint-
dc.identifier.doi10.1016/j.seppur.2011.05.006en_HK
dc.identifier.scopuseid_2-s2.0-84864753001en_HK
dc.identifier.hkuros190467en_US
dc.identifier.volume80en_US
dc.identifier.issue2-
dc.identifier.spage276en_US
dc.identifier.epage283en_US
dc.identifier.isiWOS:000293310300012-
dc.publisher.placeUnited Kingdomen_HK
dc.relation.projectEnvironmental Bio-Nano Interface (EBNI) Characterization System-
dc.identifier.scopusauthoridLi, Aj=24338209600en_HK
dc.identifier.scopusauthoridLi, Xy=26642887900en_HK
dc.identifier.scopusauthoridYu, Hq=13008678100en_HK
dc.identifier.citeulike9380863-

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