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Article: Role of gelling soluble and colloidal microbial products in membrane fouling

TitleRole of gelling soluble and colloidal microbial products in membrane fouling
Authors
KeywordsChemicals And Cas Registry Numbers
Issue Date2009
PublisherAmerican Chemical Society. The Journal's web site is located at http://pubs.acs.org/est
Citation
Environmental Science And Technology, 2009, v. 43 n. 24, p. 9341-9347 How to Cite?
AbstractThe mechanism underlying gel layer formation on membrane surfaces from soluble and colloidal microbial products (SCMPs) produced under unfavorable operational conditions for membrane bioreactors (MBRs) has been investigated using supernatants from a bench-scale MBR. SCMPs can be grossly classified into gelling and nongelling SCMPs with the gelling fraction associated mostly with the polysaccharide content. The significant role played by multivalent metals in gel formation through metal-ligand complexation has been confirmed. Functional groups of the gelling SCMPs were determined by pH titration and ξ potential measurement as amine/phenolic sites (pKa 9.3 and 8.0), carboxylic sites (pKa 6.6, 4.9, and ca. 4.0), and phosphoric sites (pK a ca. 2.5). The carboxylic sites were more directly involved with multivalent cation complexation; however, the gelling propensity of the SCMP dispersion was minimally affected by pH change in the circum-neutral pH range, suggesting that the strong carboxylic sites were principally responsible for gel formation. The SCMPs demonstrated a high potential for gel formation given the high density of the strong carboxylic acid groups of about 0.44 mmol/g-TOC and a moderate calcium binding stability constant of about 4.9 × 103 M-1. © 2009 American Chemical Society.
Persistent Identifierhttp://hdl.handle.net/10722/132398
ISSN
2015 Impact Factor: 5.393
2015 SCImago Journal Rankings: 2.664
ISI Accession Number ID
Funding AgencyGrant Number
Australian Research Council through ARC DiscoveryDP0665515
Funding Information:

Funding provided by the Australian Research Council through ARC Discovery grant DP0665515 is gratefully acknowledged.

References

 

DC FieldValueLanguage
dc.contributor.authorWang, XMen_HK
dc.contributor.authorWaite, TDen_HK
dc.date.accessioned2011-03-28T09:24:07Z-
dc.date.available2011-03-28T09:24:07Z-
dc.date.issued2009en_HK
dc.identifier.citationEnvironmental Science And Technology, 2009, v. 43 n. 24, p. 9341-9347en_HK
dc.identifier.issn0013-936Xen_HK
dc.identifier.urihttp://hdl.handle.net/10722/132398-
dc.description.abstractThe mechanism underlying gel layer formation on membrane surfaces from soluble and colloidal microbial products (SCMPs) produced under unfavorable operational conditions for membrane bioreactors (MBRs) has been investigated using supernatants from a bench-scale MBR. SCMPs can be grossly classified into gelling and nongelling SCMPs with the gelling fraction associated mostly with the polysaccharide content. The significant role played by multivalent metals in gel formation through metal-ligand complexation has been confirmed. Functional groups of the gelling SCMPs were determined by pH titration and ξ potential measurement as amine/phenolic sites (pKa 9.3 and 8.0), carboxylic sites (pKa 6.6, 4.9, and ca. 4.0), and phosphoric sites (pK a ca. 2.5). The carboxylic sites were more directly involved with multivalent cation complexation; however, the gelling propensity of the SCMP dispersion was minimally affected by pH change in the circum-neutral pH range, suggesting that the strong carboxylic sites were principally responsible for gel formation. The SCMPs demonstrated a high potential for gel formation given the high density of the strong carboxylic acid groups of about 0.44 mmol/g-TOC and a moderate calcium binding stability constant of about 4.9 × 103 M-1. © 2009 American Chemical Society.en_HK
dc.languageengen_US
dc.publisherAmerican Chemical Society. The Journal's web site is located at http://pubs.acs.org/esten_HK
dc.relation.ispartofEnvironmental Science and Technologyen_HK
dc.subjectChemicals And Cas Registry Numbersen_US
dc.titleRole of gelling soluble and colloidal microbial products in membrane foulingen_HK
dc.typeArticleen_HK
dc.identifier.emailWang, XM: wangxm@hku.hken_HK
dc.identifier.authorityWang, XM=rp01452en_HK
dc.description.naturelink_to_subscribed_fulltexten_US
dc.identifier.doi10.1021/es9013129en_HK
dc.identifier.pmid20000527-
dc.identifier.scopuseid_2-s2.0-72849119537en_HK
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-72849119537&selection=ref&src=s&origin=recordpageen_HK
dc.identifier.volume43en_HK
dc.identifier.issue24en_HK
dc.identifier.spage9341en_HK
dc.identifier.epage9347en_HK
dc.identifier.eissn1520-5851-
dc.identifier.isiWOS:000272462500048-
dc.publisher.placeUnited Statesen_HK
dc.identifier.scopusauthoridWang, XM=23092524200en_HK
dc.identifier.scopusauthoridWaite, TD=7004869232en_HK

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