Membrane Fouling Potential of Secondary Effluent Organic Matter (EfOM) from Conventional Activated Sludge Process

Handle URI:
http://hdl.handle.net/10754/348467
Title:
Membrane Fouling Potential of Secondary Effluent Organic Matter (EfOM) from Conventional Activated Sludge Process
Authors:
Wei, Chunhai; Amy, Gary L.
Abstract:
Secondary effluent organic matter (EfOM) from a conventional activated sludge process was filtered through constant-pressure dead-end filtration tests with a sequential ultrafiltration (UF, molecular weight cut-off (MWCO) of 10k Dalton) and nanofiltration (NF, MWCO of 200 Dalton) array to investigate its membrane fouling potential. Advanced analytical methods including liquid chromatography with online carbon detection (LC-OCD) and fluorescent excitation-emission matrix (F-EEM) were employed for EfOM characterization. EfOM consisted of humic substances and building blocks, low molecular weight (LMW) neutrals, biopolymers (mainly proteins) and hydrophobic organics according to the sequence of their organic carbon fractions. The UF rejected only biopolymers and the NF rejected most humics and building blocks and a significant part of LMW neutrals. Simultaneous occurrence of cake layer and standard blocking during the filtration process of both UF and NF was identified according to constant-pressure filtration equations, which was possibly caused by the heterogeneous nature of EfOM with a wide MW distribution (several ten to several million Dalton). Thus the corresponding two fouling indices (kc for cake layer and ks for standard blocking) from UF and NF could characterize the fouling potential of macromolecular biopolymers and low to intermediate MW organics (including humics, building blocks, LMW neutrals), respectively. Compared with macromolecular biopolymers, low to intermediate MW organics exhibited a much higher fouling potential due to their lower molecular weight and higher concentration.
KAUST Department:
Water Desalination and Reuse Research Center (WDRC)
Citation:
Membrane Fouling Potential of Secondary Effluent Organic Matter (EfOM) from Conventional Activated Sludge Process 2012 Journal of Membrane and Separation Technology
Publisher:
Lifescience Global
Journal:
Journal of Membrane and Separation Technology
Issue Date:
2012
DOI:
10.6000/1929-6037.2012.01.02.7
Type:
Article
ISSN:
19296037
Additional Links:
http://www.lifescienceglobal.com/journals/journal-of-membrane-and-separation-technology/volume-1-number-2
Appears in Collections:
Articles; Water Desalination and Reuse Research Center (WDRC)

Full metadata record

DC FieldValue Language
dc.contributor.authorWei, Chunhaien
dc.contributor.authorAmy, Gary L.en
dc.date.accessioned2015-04-02T13:28:18Zen
dc.date.available2015-04-02T13:28:18Zen
dc.date.issued2012en
dc.identifier.citationMembrane Fouling Potential of Secondary Effluent Organic Matter (EfOM) from Conventional Activated Sludge Process 2012 Journal of Membrane and Separation Technologyen
dc.identifier.issn19296037en
dc.identifier.doi10.6000/1929-6037.2012.01.02.7en
dc.identifier.urihttp://hdl.handle.net/10754/348467en
dc.description.abstractSecondary effluent organic matter (EfOM) from a conventional activated sludge process was filtered through constant-pressure dead-end filtration tests with a sequential ultrafiltration (UF, molecular weight cut-off (MWCO) of 10k Dalton) and nanofiltration (NF, MWCO of 200 Dalton) array to investigate its membrane fouling potential. Advanced analytical methods including liquid chromatography with online carbon detection (LC-OCD) and fluorescent excitation-emission matrix (F-EEM) were employed for EfOM characterization. EfOM consisted of humic substances and building blocks, low molecular weight (LMW) neutrals, biopolymers (mainly proteins) and hydrophobic organics according to the sequence of their organic carbon fractions. The UF rejected only biopolymers and the NF rejected most humics and building blocks and a significant part of LMW neutrals. Simultaneous occurrence of cake layer and standard blocking during the filtration process of both UF and NF was identified according to constant-pressure filtration equations, which was possibly caused by the heterogeneous nature of EfOM with a wide MW distribution (several ten to several million Dalton). Thus the corresponding two fouling indices (kc for cake layer and ks for standard blocking) from UF and NF could characterize the fouling potential of macromolecular biopolymers and low to intermediate MW organics (including humics, building blocks, LMW neutrals), respectively. Compared with macromolecular biopolymers, low to intermediate MW organics exhibited a much higher fouling potential due to their lower molecular weight and higher concentration.en
dc.publisherLifescience Globalen
dc.relation.urlhttp://www.lifescienceglobal.com/journals/journal-of-membrane-and-separation-technology/volume-1-number-2en
dc.rightsThis is an open access article licensed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/by-nc/3.0/ ) which permits unrestricted, non-commercial use, distribution and reproduction in any medium, provided the work is properly cited.en
dc.titleMembrane Fouling Potential of Secondary Effluent Organic Matter (EfOM) from Conventional Activated Sludge Processen
dc.typeArticleen
dc.contributor.departmentWater Desalination and Reuse Research Center (WDRC)en
dc.identifier.journalJournal of Membrane and Separation Technologyen
dc.eprint.versionPublisher's Version/PDFen
dc.contributor.affiliationKing Abdullah University of Science and Technology (KAUST)en
kaust.authorWei, Chunhaien
kaust.authorAmy, Gary L.en
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