A Critical Assessment of Microbiological Biogas to Biomethane Upgrading Systems

Autor(en)
Simon Karl-Maria Rasso Rittmann
Abstrakt

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 volumetric CH(4) productivity, as well as if the aim of a single stage conversion to a CH(4) fermentation offgas content exceeding 95 vol% can be demonstrated, ex situ microbiological biogas upgrading with pure or enrichment cultures of methanogens could become a promising future technology for almost CO(2)-neutral biomethane production.

Organisation(en)
Department für Ökogenomik und Systembiologie
Journal
Advances in Biochemical Engineering/Biotechnology
Band
151
Seiten
117-135
ISSN
0724-6145
DOI
https://doi.org/10.1007/978-3-319-21993-6_5
Publikationsdatum
2015
Peer-reviewed
Ja
ÖFOS 2012
Biochemie
Link zum Portal
https://ucris.univie.ac.at/portal/de/publications/a-critical-assessment-of-microbiological-biogas-to-biomethane-upgrading-systems(b7827e95-3335-4511-97fa-073b1abe967a).html