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

Jean-Charles Motte1, Eric Trably1, Jérôme Hamelin1

  • 1INRA, UR0050, Laboratoire de Biotechnologie de l'Environnement, Avenue des Etangs, Narbonne F-11100, France.

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Summary

Higher total solid content (TS) significantly reduces thermophilic hydrogen production from wheat straw. Dry conditions led to lower yields due to lactic acid accumulation and shifts in microbial communities.

Keywords:
BiohydrogenDark fermentationLignocellulosic residuesSolid-state processeshydA genes

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Area of Science:

  • Biotechnology
  • Renewable Energy
  • Microbiology

Background:

  • Thermophilic hydrogen production offers a sustainable biofuel pathway.
  • Wheat straw is an abundant lignocellulosic biomass resource.
  • Optimizing process conditions is crucial for efficient biohydrogen yields.

Purpose of the Study:

  • To investigate the impact of varying total solid content (TS) on thermophilic hydrogen production from wheat straw.
  • To correlate hydrogen yields with metabolic and microbial shifts under different TS conditions.

Main Methods:

  • Batch tests were conducted using wheat straw at six different TS levels (10-34%).
  • Hydrogen (H₂) yields were measured and statistically analyzed.
  • Metabolic byproducts (lactic acid) and microbial community composition were analyzed.

Main Results:

  • Hydrogen yields decreased significantly with increasing TS content.
  • Three distinct yield groups were identified: wet (10-14% TS), intermediate (19% TS), and dry (25-34% TS).
  • Dry conditions (≥25% TS) resulted in lactic acid accumulation and shifts in microbial populations, favoring Bacilli and Bacteroidetes alongside Clostridia.

Conclusions:

  • Total solid content is a critical factor influencing thermophilic hydrogen production efficiency from wheat straw.
  • Dry conditions negatively impact hydrogen yields by altering microbial metabolism and community structure.
  • Further research should focus on optimizing TS levels and managing microbial dynamics for enhanced biohydrogen generation.