Stability of ex situ biological methanation of H2/CO2 with a mixed microbial culture in a pilot scale bubble column reactor - Archive ouverte HAL Access content directly
Journal Articles Bioresource Technology Year : 2022

Stability of ex situ biological methanation of H2/CO2 with a mixed microbial culture in a pilot scale bubble column reactor

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Léa Laguillaumie
  • Function : Author
  • PersonId : 1181540
Yan Rafrafi
  • Function : Author
  • PersonId : 1019266
Elisabeth Moya-Leclair
  • Function : Author
  • PersonId : 964408
Delphine Delagnes
  • Function : Author
  • PersonId : 1181431
Simon Dubos
  • Function : Author
  • PersonId : 1181434
M. Sperandio
Etienne Paul

Abstract

Biological methanation is a promising technology for gas and carbon valorisation. Therefore, process stability is required to allow its scale up and development. A pilot scale bubble column reactor was used for ex situ biological methanation with Mixed Microbial Culture (MMC). A 16S rRNA high throughput sequencing analysis revealed the MMC reached a stable composition with 50-60% Methanobacterium in closed liquid mode, a robust genus adapted to large scale constraints. Class MBA03 was identified as an indicator of process stability. Methanogenic genera moved toward 50% of Methanothermobacter when intensifying the process, and proteolytic activity was identified while 94% of H2/CO2 was converted into methane at 4NL.L-1.d-1. This study gives clarifications on the origin of volatile fatty acids (VFA) apparitions. Acetate and propionate accumulated when methanogenic activity weakened due to nutritive deficiency, and when PH2 reached 0.7 bar. The MMC withstood a storage period of 34d at room temperature indicating its suitability for industrial constraints.
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Dates and versions

hal-03836933 , version 1 (02-11-2022)

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Léa Laguillaumie, Yan Rafrafi, Elisabeth Moya-Leclair, Delphine Delagnes, Simon Dubos, et al.. Stability of ex situ biological methanation of H2/CO2 with a mixed microbial culture in a pilot scale bubble column reactor. Bioresource Technology, 2022, 354, ⟨10.1016/j.biortech.2022.127180⟩. ⟨hal-03836933⟩
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