Stick or leave – Pushing methanogens to biofilm formation for ex situ biomethanation
[Display omitted] •Substantial enhancement of methanogenic biofilm activity at short HRT.•Planktonic hydrogenotrophic methanogens restricted biofilm growth at long HRT.•Acetate accumulation at short HRT due to increased homoacetogenesis.•Selected hydrogenotrophic biofilm species independent of HRT a...
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| Published in | Bioresource technology Vol. 291; p. 121784 |
|---|---|
| Main Authors | , , , , , , |
| Format | Journal Article |
| Language | English |
| Published |
England
Elsevier Ltd
01.11.2019
|
| Subjects | |
| Online Access | Get full text |
| ISSN | 0960-8524 1873-2976 1873-2976 |
| DOI | 10.1016/j.biortech.2019.121784 |
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| Abstract | [Display omitted]
•Substantial enhancement of methanogenic biofilm activity at short HRT.•Planktonic hydrogenotrophic methanogens restricted biofilm growth at long HRT.•Acetate accumulation at short HRT due to increased homoacetogenesis.•Selected hydrogenotrophic biofilm species independent of HRT and sludge source.
Biomethanation exploits the ability of methanogenic archaea to convert CO2 and renewable H2 from electrolysis to biomethane. Biofilm reactors are promising for biomethanation scale-up due to high CH4 productivity and low energy input for H2 gas-liquid mass transfer. Effects of operational conditions on biofilm dynamics remain largely uncharacterized but may increase reactor potentials further. This study investigated the effect of hydraulic retention time (HRT) on methanogenic biofilm activity and composition. Commercial carriers floating in liquid were exposed to H2/CO2 for 87 days with the liquid phase being subject to either 18 hours, 10 days, or 20 days HRT. Methanogenic biofilms were dominated by hydrogenotrophic methanogens, but biofilm CH4 productivity was enhanced at 18 hours HRT due to wash-out of competing planktonic species, which otherwise hampered proliferation of biofilm biomass at long HRT. It is suggested that high-rate biofilm reactors can increase methanogenic biofilm activity by minimizing the liquid’s H2 exposure. |
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| AbstractList | Biomethanation exploits the ability of methanogenic archaea to convert CO₂ and renewable H₂ from electrolysis to biomethane. Biofilm reactors are promising for biomethanation scale-up due to high CH₄ productivity and low energy input for H₂ gas-liquid mass transfer. Effects of operational conditions on biofilm dynamics remain largely uncharacterized but may increase reactor potentials further. This study investigated the effect of hydraulic retention time (HRT) on methanogenic biofilm activity and composition. Commercial carriers floating in liquid were exposed to H₂/CO₂ for 87 days with the liquid phase being subject to either 18 hours, 10 days, or 20 days HRT. Methanogenic biofilms were dominated by hydrogenotrophic methanogens, but biofilm CH₄ productivity was enhanced at 18 hours HRT due to wash-out of competing planktonic species, which otherwise hampered proliferation of biofilm biomass at long HRT. It is suggested that high-rate biofilm reactors can increase methanogenic biofilm activity by minimizing the liquid’s H₂ exposure. Biomethanation exploits the ability of methanogenic archaea to convert CO and renewable H from electrolysis to biomethane. Biofilm reactors are promising for biomethanation scale-up due to high CH productivity and low energy input for H gas-liquid mass transfer. Effects of operational conditions on biofilm dynamics remain largely uncharacterized but may increase reactor potentials further. This study investigated the effect of hydraulic retention time (HRT) on methanogenic biofilm activity and composition. Commercial carriers floating in liquid were exposed to H /CO for 87 days with the liquid phase being subject to either 18 hours, 10 days, or 20 days HRT. Methanogenic biofilms were dominated by hydrogenotrophic methanogens, but biofilm CH productivity was enhanced at 18 hours HRT due to wash-out of competing planktonic species, which otherwise hampered proliferation of biofilm biomass at long HRT. It is suggested that high-rate biofilm reactors can increase methanogenic biofilm activity by minimizing the liquid's H exposure. Biomethanation exploits the ability of methanogenic archaea to convert CO2 and renewable H2 from electrolysis to biomethane. Biofilm reactors are promising for biomethanation scale-up due to high CH4 productivity and low energy input for H2 gas-liquid mass transfer. Effects of operational conditions on biofilm dynamics remain largely uncharacterized but may increase reactor potentials further. This study investigated the effect of hydraulic retention time (HRT) on methanogenic biofilm activity and composition. Commercial carriers floating in liquid were exposed to H2/CO2 for 87 days with the liquid phase being subject to either 18 hours, 10 days, or 20 days HRT. Methanogenic biofilms were dominated by hydrogenotrophic methanogens, but biofilm CH4 productivity was enhanced at 18 hours HRT due to wash-out of competing planktonic species, which otherwise hampered proliferation of biofilm biomass at long HRT. It is suggested that high-rate biofilm reactors can increase methanogenic biofilm activity by minimizing the liquid's H2 exposure.Biomethanation exploits the ability of methanogenic archaea to convert CO2 and renewable H2 from electrolysis to biomethane. Biofilm reactors are promising for biomethanation scale-up due to high CH4 productivity and low energy input for H2 gas-liquid mass transfer. Effects of operational conditions on biofilm dynamics remain largely uncharacterized but may increase reactor potentials further. This study investigated the effect of hydraulic retention time (HRT) on methanogenic biofilm activity and composition. Commercial carriers floating in liquid were exposed to H2/CO2 for 87 days with the liquid phase being subject to either 18 hours, 10 days, or 20 days HRT. Methanogenic biofilms were dominated by hydrogenotrophic methanogens, but biofilm CH4 productivity was enhanced at 18 hours HRT due to wash-out of competing planktonic species, which otherwise hampered proliferation of biofilm biomass at long HRT. It is suggested that high-rate biofilm reactors can increase methanogenic biofilm activity by minimizing the liquid's H2 exposure. [Display omitted] •Substantial enhancement of methanogenic biofilm activity at short HRT.•Planktonic hydrogenotrophic methanogens restricted biofilm growth at long HRT.•Acetate accumulation at short HRT due to increased homoacetogenesis.•Selected hydrogenotrophic biofilm species independent of HRT and sludge source. Biomethanation exploits the ability of methanogenic archaea to convert CO2 and renewable H2 from electrolysis to biomethane. Biofilm reactors are promising for biomethanation scale-up due to high CH4 productivity and low energy input for H2 gas-liquid mass transfer. Effects of operational conditions on biofilm dynamics remain largely uncharacterized but may increase reactor potentials further. This study investigated the effect of hydraulic retention time (HRT) on methanogenic biofilm activity and composition. Commercial carriers floating in liquid were exposed to H2/CO2 for 87 days with the liquid phase being subject to either 18 hours, 10 days, or 20 days HRT. Methanogenic biofilms were dominated by hydrogenotrophic methanogens, but biofilm CH4 productivity was enhanced at 18 hours HRT due to wash-out of competing planktonic species, which otherwise hampered proliferation of biofilm biomass at long HRT. It is suggested that high-rate biofilm reactors can increase methanogenic biofilm activity by minimizing the liquid’s H2 exposure. |
| ArticleNumber | 121784 |
| Author | de Jonge, Nadieh Nielsen, Jeppe Lund Jensen, Mads Borgbjerg Ottosen, Lars Ditlev Mørck Strübing, Dietmar Koch, Konrad Kofoed, Michael Vedel Wegener |
| Author_xml | – sequence: 1 givenname: Mads Borgbjerg surname: Jensen fullname: Jensen, Mads Borgbjerg organization: Department of Engineering, Aarhus University, Hangøvej 2, DK-8200 Aarhus N., Denmark – sequence: 2 givenname: Dietmar surname: Strübing fullname: Strübing, Dietmar organization: Chair of Urban Water Systems Engineering, Technical University of Munich, Am Coloumbwall 3, 85748 Garching, Germany – sequence: 3 givenname: Nadieh surname: de Jonge fullname: de Jonge, Nadieh organization: Department of Chemistry and Bioscience, Aalborg University, Fredrik Bajers Vej 7H, DK-9220 Aalborg, Denmark – sequence: 4 givenname: Jeppe Lund surname: Nielsen fullname: Nielsen, Jeppe Lund organization: Department of Chemistry and Bioscience, Aalborg University, Fredrik Bajers Vej 7H, DK-9220 Aalborg, Denmark – sequence: 5 givenname: Lars Ditlev Mørck surname: Ottosen fullname: Ottosen, Lars Ditlev Mørck organization: Department of Engineering, Aarhus University, Hangøvej 2, DK-8200 Aarhus N., Denmark – sequence: 6 givenname: Konrad orcidid: 0000-0001-5425-0169 surname: Koch fullname: Koch, Konrad organization: Chair of Urban Water Systems Engineering, Technical University of Munich, Am Coloumbwall 3, 85748 Garching, Germany – sequence: 7 givenname: Michael Vedel Wegener surname: Kofoed fullname: Kofoed, Michael Vedel Wegener email: mvk@eng.au.dk organization: Department of Engineering, Aarhus University, Hangøvej 2, DK-8200 Aarhus N., Denmark |
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•Substantial enhancement of methanogenic biofilm activity at short HRT.•Planktonic hydrogenotrophic methanogens restricted biofilm growth at... Biomethanation exploits the ability of methanogenic archaea to convert CO and renewable H from electrolysis to biomethane. Biofilm reactors are promising for... Biomethanation exploits the ability of methanogenic archaea to convert CO2 and renewable H2 from electrolysis to biomethane. Biofilm reactors are promising for... Biomethanation exploits the ability of methanogenic archaea to convert CO₂ and renewable H₂ from electrolysis to biomethane. Biofilm reactors are promising for... |
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| Title | Stick or leave – Pushing methanogens to biofilm formation for ex situ biomethanation |
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