A Critical Assessment of Microbiological Biogas to Biomethane Upgrading Systems

Advances in Biochemical Engineering/biotechnology
Simon K-M R Rittmann

Abstract

Microbiological biogas upgrading could become a promising technology for production of methane (CH(4)). This is, storage of irregular generated electricity results in a need to store electricity generated at peak times for use at non-peak times, which could be achieved in an intermediate step by electrolysis of water to molecular hydrogen (H(2)). Microbiological biogas upgrading can be performed by contacting carbon dioxide (CO(2)), H(2) and hydrogenotrophic methanogenic Archaea either in situ in an anaerobic digester, or ex situ in a separate bioreactor. In situ microbiological biogas upgrading is indicated to require thorough bioprocess development, because only low volumetric CH(4) production rates and low CH(4) fermentation offgas content have been achieved. Higher volumetric production rates are shown for the ex situ microbiological biogas upgrading compared to in situ microbiological biogas upgrading. However, the ex situ microbiological biogas upgrading currently suffers from H(2) gas liquid mass transfer limitation, which results in low volumetric CH(4) productivity compared to pure H(2)/CO(2) conversion to CH(4). If waste gas utilization from biological and industrial sources can be shown without reduction in volumetri...Continue Reading

Citations

May 21, 2016·Frontiers in Microbiology·Ruth-Sophie Taubner, Simon K-M R Rittmann
Jun 27, 2018·FEMS Microbiology Reviews·Christopher T StraubRobert M Kelly
Nov 18, 2018·Folia Microbiologica·Lisa-Maria MauerhoferSimon K-M R Rittmann
Mar 7, 2021·Communications Biology·Lisa-Maria MauerhoferSimon K-M R Rittmann

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