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Total solid content drives hydrogen production through microbial selection during thermophilic fermentation

Abstract : In this study, the effect of total solid content (TS) on thermophilic hydrogen production from wheat straw was investigated. Six TS contents ranging from wet to dry conditions (10-34%TS) were tested in batch tests. A decrease of H₂ yields was observed and three statistical groups were distinguished according to the TS content: wet conditions (10% and 14%TS) with 15.3 ± 1.6 NmlH₂ gTS(-1), intermediate conditions (19%TS) with 6.4 ± 1.0 NmlH₂ gTS(-1) and dry conditions (25-34%TS) with 3.4 ± 0.8 NmlH₂ gTS(-1). Such a decrease in biohydrogen yields was related to a metabolic shift with an accumulation of lactic acid under dry conditions. Concomitantly, a microbial population shift was observed with a dominance of species related to the class Clostridia under wet conditions, and a co-dominance of members of Bacilli, Clostridia classes and Bacteroidetes phylum under dry conditions.
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https://hal.inrae.fr/hal-02640079
Contributor : Migration Prodinra <>
Submitted on : Thursday, May 28, 2020 - 1:43:27 PM
Last modification on : Friday, February 5, 2021 - 4:03:06 AM

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Jean-Charles Motte, Eric Trably, Jérôme Hamelin, Renaud Escudie, Anaïs Bonnafous, et al.. Total solid content drives hydrogen production through microbial selection during thermophilic fermentation. Bioresource Technology, Elsevier, 2014, 166, pp.610-615. ⟨10.1016/j.biortech.2014.05.078⟩. ⟨hal-02640079⟩

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