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Optimization of Thermodynamic Parameters of the Biological Hydrogen Methanation in a Trickle-Bed Reactor for the Conditioning of Biogas to Biomethane

Author

Listed:
  • Elena Holl

    (State Institute of Agricultural Engineering and Bioenergy, University of Hohenheim, 70599 Stuttgart, Germany)

  • Anastasia Oskina

    (State Institute of Agricultural Engineering and Bioenergy, University of Hohenheim, 70599 Stuttgart, Germany)

  • Urs Baier

    (Specialist Department for Biocatalysis and Process Technology, School of Life Sciences and Facility Management, ZHAW Zurich University of Applied Sciences, 8400 Winterthur, Switzerland)

  • Andreas Lemmer

    (State Institute of Agricultural Engineering and Bioenergy, University of Hohenheim, 70599 Stuttgart, Germany)

Abstract

The increased demand for resources and energy that is developing with rising global consumption represents a key challenge for our generation. Biogas production can contribute to sustainable energy production and closing nutrient cycles using organic residues or as part of a utilization cascade in the case of energy crops. Compared to hydrogen (H 2 ), biogas with a high methane (CH 4 ) content can be fed into the gas grid without restrictions. For this purpose, the CH 4 content of the biogas must be increased from 52 to 60% after anaerobic digestion to more than 96%. In this study, biological hydrogen methanation (BHM) in trickling-bed reactors (TBR) is used to upgrade biogas. Design of experiments (DoE) is used to determine the optimal process parameters. The performance of the reactors is stable under all given conditions, reaching a “low” gas grid quality of over 90%. The highest CH 4 content of 95.626 ± 0.563% is achieved at 55 °C and 4 bar, with a methane formation rate (MFR) of 5.111 ± 0.167 m 3 /(m 3 ·d). The process performance is highly dependent on the H 2 :CO 2 ratio in the educts, which should be as close as possible to the stochiometric ratio of 4. In conclusion, BHM is a viable approach to upgrade biogas to biomethane quality and can contribute to a sustainable energy grid.

Suggested Citation

  • Elena Holl & Anastasia Oskina & Urs Baier & Andreas Lemmer, 2023. "Optimization of Thermodynamic Parameters of the Biological Hydrogen Methanation in a Trickle-Bed Reactor for the Conditioning of Biogas to Biomethane," Energies, MDPI, vol. 16(12), pages 1-13, June.
    • Handle: RePEc:gam:jeners:v:16:y:2023:i:12:p:4720-:d:1171425
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    References listed on IDEAS

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    1. Andreas Lemmer & Timo Ullrich, 2018. "Effect of Different Operating Temperatures on the Biological Hydrogen Methanation in Trickle Bed Reactors," Energies, MDPI, vol. 11(6), pages 1-11, May.
    2. Westerholm, M. & Isaksson, S. & Karlsson Lindsjö, O. & Schnürer, A., 2018. "Microbial community adaptability to altered temperature conditions determines the potential for process optimisation in biogas production," Applied Energy, Elsevier, vol. 226(C), pages 838-848.
    3. Burkhardt, Marko & Busch, Günter, 2013. "Methanation of hydrogen and carbon dioxide," Applied Energy, Elsevier, vol. 111(C), pages 74-79.
    4. JONES, Bradley & GOOS, Peter, 2012. "I-optimal versus D-optimal split-plot response surface designs," Working Papers 2012002, University of Antwerp, Faculty of Business and Economics.
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