Bioaugmentation enhances dark fermentative hydrogen production in cultures exposed to short-term temperature fluctuations

Hydrogen-producing mixed cultures were subjected to a 48-h downward or upward temperature fluctuation from 55 to 35 or 75 °C. Hydrogen production was monitored during the fluctuations and for three consecutive batch cultivations at 55 °C to evaluate the impact of temperature fluctuations and bioaugm...

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Bibliographic Details
Published in:Applied microbiology and biotechnology 2020-01, Vol.104 (1), p.439-449
Main Authors: Okonkwo, Onyinye, Escudie, Renaud, Bernet, Nicolas, Mangayil, Rahul, Lakaniemi, Aino-Maija, Trably, Eric
Format: Article
Language:English
Subjects:
Bioenergy and Biofuels
Biomedical and Life Sciences
Bioremediation
Biotechnology
Environmental Sciences
Fermentation
Fluctuations
Hydrogen
Hydrogen production
Life Sciences
Microbial Genetics and Genomics
Microbiology
Mixed culture
Temperature
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Summary:Hydrogen-producing mixed cultures were subjected to a 48-h downward or upward temperature fluctuation from 55 to 35 or 75 °C. Hydrogen production was monitored during the fluctuations and for three consecutive batch cultivations at 55 °C to evaluate the impact of temperature fluctuations and bioaugmentation with synthetic mixed culture of known H 2 producers either during or after the fluctuation. Without augmentation, H 2 production was significantly reduced during the downward temperature fluctuation and no H 2 was produced during the upward fluctuation. H 2 production improved significantly during temperature fluctuation when bioaugmentation was applied to cultures exposed to downward or upward temperatures. However, when bioaugmentation was applied after the fluctuation, i.e., when the cultures were returned to 55 °C, the H 2 yields obtained were between 1.6 and 5% higher than when bioaugmentation was applied during the fluctuation. Thus, the results indicate the usefulness of bioaugmentation in process recovery, especially if bioaugmentation time is optimised.
ISSN:0175-7598
1432-0614
DOI:10.1007/s00253-019-10203-8