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Optimization of the Ex Situ Biomethanation of Hydrogen and Carbon Dioxide in a Novel Meandering Plug Flow Reactor: Start-Up Phase and Flexible Operation.
- Source :
- Bioengineering (Basel); Feb2024, Vol. 11 Issue 2, p165, 18p
- Publication Year :
- 2024
-
Abstract
- With the increasing use of renewable energy resources for the power grid, the need for long-term storage technologies, such as power-to-gas systems, is growing. Biomethanation provides the opportunity to store energy in the form of the natural gas-equivalent biomethane. This study investigates a novel plug flow reactor that employs a helical static mixer for the biological methanation of hydrogen and carbon dioxide. In tests, the reactor achieved an average methane production rate of 2.5 L C H 4 L R ∗ d (methane production [L<subscript>CH4</subscript>] per liter of reactor volume [L<subscript>R</subscript>] per day [d]) with a maximum methane content of 94%. It demonstrated good flexibilization properties, as repeated 12 h downtimes did not negatively impact the process. The genera Methanothermobacter and Methanobacterium were predominant during the initial phase, along with volatile organic acid-producing, hydrogenotrophic, and proteolytic bacteria. The average ratio of volatile organic acid to total inorganic carbon increased to 0.52 ± 0.04, while the pH remained stable at an average of pH 8.1 ± 0.25 from day 32 to 98, spanning stable and flexible operation modes. This study contributes to the development of efficient flexible biological methanation systems for sustainable energy storage and management. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 23065354
- Volume :
- 11
- Issue :
- 2
- Database :
- Complementary Index
- Journal :
- Bioengineering (Basel)
- Publication Type :
- Academic Journal
- Accession number :
- 175646788
- Full Text :
- https://doi.org/10.3390/bioengineering11020165