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
The 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 AF...
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doaj-b627e5be60df4f8882bf95f8ca6a4d582021-06-01T00:20:42ZengMDPI AGMembranes2077-03752021-05-011136536510.3390/membranes11050365Combined Effect of Activated Carbon Particles and Non-Adsorptive Spherical Beads as Fluidized Media on Fouling, Organic Removal and Microbial Communities in Anaerobic Membrane BioreactorDaeeun Kwon0Theo Y.C. Lam1Minseok Kim2Giin-Yu Amy Tan3Po-Heng Lee4Jeonghwan Kim5Department of Environmental Engineering, Program in Environmental and Polymer Engineering, Inha University, Inharo 100, Michuholgu, Incheon 22212, KoreaDepartment of Civil Engineering, The University of Hong Kong, Pokfulam, Hong KongDepartment of Environmental Engineering, Program in Environmental and Polymer Engineering, Inha University, Inharo 100, Michuholgu, Incheon 22212, KoreaDepartment of Civil Engineering, The University of Hong Kong, Pokfulam, Hong KongDepartment of Civil and Environmental Engineering, Imperial College London, London SW7 2AZ, UKDepartment of Environmental Engineering, Program in Environmental and Polymer Engineering, Inha University, Inharo 100, Michuholgu, Incheon 22212, KoreaThe 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/m<sup>3</sup>, and it was only about 13% of that produced by AFMBR.https://www.mdpi.com/2077-0375/11/5/365anaerobic fluidized bed bioreactorGACABS mediaenergy reduction |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Daeeun Kwon Theo Y.C. Lam Minseok Kim Giin-Yu Amy Tan Po-Heng Lee Jeonghwan Kim |
spellingShingle |
Daeeun Kwon Theo Y.C. Lam Minseok Kim Giin-Yu Amy Tan Po-Heng Lee Jeonghwan Kim 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 Membranes anaerobic fluidized bed bioreactor GAC ABS media energy reduction |
author_facet |
Daeeun Kwon Theo Y.C. Lam Minseok Kim Giin-Yu Amy Tan Po-Heng Lee Jeonghwan Kim |
author_sort |
Daeeun Kwon |
title |
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 |
title_short |
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 |
title_full |
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 |
title_fullStr |
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 |
title_full_unstemmed |
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 |
title_sort |
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 |
publisher |
MDPI AG |
series |
Membranes |
issn |
2077-0375 |
publishDate |
2021-05-01 |
description |
The 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/m<sup>3</sup>, and it was only about 13% of that produced by AFMBR. |
topic |
anaerobic fluidized bed bioreactor GAC ABS media energy reduction |
url |
https://www.mdpi.com/2077-0375/11/5/365 |
work_keys_str_mv |
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