| Autor: |
Hoffstadt K; Institute NOWUM-Energy, University of Applied Sciences Aachen, Heinrich-Mussmann-Str. 1, 52428 Juelich, Germany., Nikolausz M; Department of Microbial Biotechnology, Helmholtz Centre for Environmental Research-UFZ, Permoserstr. 15, 04318 Leipzig, Germany., Krafft S; Institute NOWUM-Energy, University of Applied Sciences Aachen, Heinrich-Mussmann-Str. 1, 52428 Juelich, Germany., Bonatelli ML; Department of Microbial Biotechnology, Helmholtz Centre for Environmental Research-UFZ, Permoserstr. 15, 04318 Leipzig, Germany., Kumar V; Institute NOWUM-Energy, University of Applied Sciences Aachen, Heinrich-Mussmann-Str. 1, 52428 Juelich, Germany., Harms H; Department of Applied Microbial Ecology, Helmholtz Centre for Environmental Research-UFZ, Permoserstr. 15, 04318 Leipzig, Germany., Kuperjans I; Institute NOWUM-Energy, University of Applied Sciences Aachen, Heinrich-Mussmann-Str. 1, 52428 Juelich, Germany. |
| Abstrakt: |
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 LCH4LR∗d (methane production [L CH4 ] per liter of reactor volume [L R ] 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. |
