Preprint Article Version 1 Preserved in Portico This version is not peer-reviewed

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

Version 1 : Received: 17 May 2023 / Approved: 18 May 2023 / Online: 18 May 2023 (11:08:13 CEST)

A peer-reviewed article of this Preprint also exists.

Holl, E.; Oskina, A.; Baier, U.; Lemmer, A. Optimization of Thermodynamic Parameters of the Biological Hydrogen Methanation in a Trickle-Bed Reactor for the Conditioning of Biogas to Biomethane. Energies 2023, 16, 4720. Holl, E.; Oskina, A.; Baier, U.; Lemmer, A. Optimization of Thermodynamic Parameters of the Biological Hydrogen Methanation in a Trickle-Bed Reactor for the Conditioning of Biogas to Biomethane. Energies 2023, 16, 4720.

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 (H2), biogas with a high methane (CH4) content can be fed into the gas grid without restrictions. For this purpose, the CH4 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 CH4 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 m³/(m³·d). The process performance is highly dependent on the H2:CO2 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.

Keywords

Biological methanation; trickle-bed reactor; biogas upgrading; high pressure; biomethane; optimization of thermodynamic parameters

Subject

Environmental and Earth Sciences, Sustainable Science and Technology

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