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Article: Combined Effect of Activated Carbon Particles and Non-Adsorptive Spherical Beads as Fluidized Media on Fouling, Organic Removal and Microbial Communities in Anaerobic Membrane Bioreactor

TitleCombined Effect of Activated Carbon Particles and Non-Adsorptive Spherical Beads as Fluidized Media on Fouling, Organic Removal and Microbial Communities in Anaerobic Membrane Bioreactor
Authors
KeywordsAnaerobic fluidized bed bioreactor
GAC
ABS media
Energy reduction
Issue Date2021
PublisherMDPI AG. The Journal's web site is located at http://www.mdpi.com/journal/membranes
Citation
Membranes, 2021, v. 11 n. 5, article no. 365 How to Cite?
AbstractThe combined effect of acrylonitrile butadiene styrene (ABS) spherical beads and granular activated carbon (GAC) particles as fluidized media on the performance of anaerobic fluidized bed membrane bioreactor (AFMBR) was investigated. GAC particles and ABS beads were fluidized together in a single AFMBR to investigate membrane fouling and organic removal efficiency as well as energy consumption. The density difference between these two similarly sized media caused the stratified bed layer where ABS beads are fluidized above the GAC along the membrane. Membrane relaxation was effective to reduce the fouling and trans-membrane pressure (TMP) below 0.25 bar could be achieved at 6 h of hydraulic retention time (HRT). More than 90% of soluble chemical oxygen demand (SCOD) was removed after 80 d operation. Biogas consisting of 65% of methane was produced by AFMBR, suggesting that combined use of GAC and ABS beads did not have any adverse effect on methane production during the operational period. Scanning Electron Microscope (SEM) examinations showed the adherence of microbes to both media. However, 16S rRNA results revealed that fewer microbes attached to ABS beads than GAC. There were also compositional differences between the ABS and GAC microbial communities. The abundance of the syntrophs and exoelectrogens population on ABS beads was relatively low compared to that of GAC. Our result implied that syntrophic synergy and possible occurrence of direct interspecies electron transfer (DIET) might be facilitated in AFMBR by GAC, while traditional methanogenic pathways were dominant in ABS beads. The electrical energy required was 0.02 kWh/m3, and it was only about 13% of that produced by AFMBR.
Persistent Identifierhttp://hdl.handle.net/10722/303932
ISSN
2023 Impact Factor: 3.3
2023 SCImago Journal Rankings: 0.551
PubMed Central ID
ISI Accession Number ID

 

DC FieldValueLanguage
dc.contributor.authorKwon, D-
dc.contributor.authorLam, TYC-
dc.contributor.authorKim, M-
dc.contributor.authorTan, GYA-
dc.contributor.authorLee, PH-
dc.contributor.authorKim, J-
dc.date.accessioned2021-09-23T08:52:49Z-
dc.date.available2021-09-23T08:52:49Z-
dc.date.issued2021-
dc.identifier.citationMembranes, 2021, v. 11 n. 5, article no. 365-
dc.identifier.issn2077-0375-
dc.identifier.urihttp://hdl.handle.net/10722/303932-
dc.description.abstractThe combined effect of acrylonitrile butadiene styrene (ABS) spherical beads and granular activated carbon (GAC) particles as fluidized media on the performance of anaerobic fluidized bed membrane bioreactor (AFMBR) was investigated. GAC particles and ABS beads were fluidized together in a single AFMBR to investigate membrane fouling and organic removal efficiency as well as energy consumption. The density difference between these two similarly sized media caused the stratified bed layer where ABS beads are fluidized above the GAC along the membrane. Membrane relaxation was effective to reduce the fouling and trans-membrane pressure (TMP) below 0.25 bar could be achieved at 6 h of hydraulic retention time (HRT). More than 90% of soluble chemical oxygen demand (SCOD) was removed after 80 d operation. Biogas consisting of 65% of methane was produced by AFMBR, suggesting that combined use of GAC and ABS beads did not have any adverse effect on methane production during the operational period. Scanning Electron Microscope (SEM) examinations showed the adherence of microbes to both media. However, 16S rRNA results revealed that fewer microbes attached to ABS beads than GAC. There were also compositional differences between the ABS and GAC microbial communities. The abundance of the syntrophs and exoelectrogens population on ABS beads was relatively low compared to that of GAC. Our result implied that syntrophic synergy and possible occurrence of direct interspecies electron transfer (DIET) might be facilitated in AFMBR by GAC, while traditional methanogenic pathways were dominant in ABS beads. The electrical energy required was 0.02 kWh/m3, and it was only about 13% of that produced by AFMBR.-
dc.languageeng-
dc.publisherMDPI AG. The Journal's web site is located at http://www.mdpi.com/journal/membranes-
dc.relation.ispartofMembranes-
dc.rightsThis work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.-
dc.subjectAnaerobic fluidized bed bioreactor-
dc.subjectGAC-
dc.subjectABS media-
dc.subjectEnergy reduction-
dc.titleCombined Effect of Activated Carbon Particles and Non-Adsorptive Spherical Beads as Fluidized Media on Fouling, Organic Removal and Microbial Communities in Anaerobic Membrane Bioreactor-
dc.typeArticle-
dc.identifier.emailLam, TYC: theo222@hku.hk-
dc.identifier.emailTan, GYA: gyatan@hku.hk-
dc.identifier.authorityTan, GYA=rp02550-
dc.description.naturepublished_or_final_version-
dc.identifier.doi10.3390/membranes11050365-
dc.identifier.pmid34069901-
dc.identifier.pmcidPMC8157586-
dc.identifier.scopuseid_2-s2.0-85107004977-
dc.identifier.hkuros325091-
dc.identifier.volume11-
dc.identifier.issue5-
dc.identifier.spagearticle no. 365-
dc.identifier.epagearticle no. 365-
dc.identifier.isiWOS:000654304100001-
dc.publisher.placeSwitzerland-

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