Abstract
To provide new insight into the dark fermentation process, a multi-lateral study was performed to study the microbiology of 20 different lab-scale bioreactors operated in four different countries (Brazil, Chile, Mexico, and Uruguay). Samples (29) were collected from bioreactors with different configurations, operation conditions, and performances. The microbial communities were analyzed using 16S rRNA genes 454 pyrosequencing. The results showed notably uneven communities with a high predominance of a particular genus. The phylum Firmicutes predominated in most of the samples, but the phyla Thermotogae or Proteobacteria dominated in a few samples. Genera from three physiological groups were detected: high-yield hydrogen producers (Clostridium, Kosmotoga, Enterobacter), fermenters with low-hydrogen yield (mostly from Veillonelaceae), and competitors (Lactobacillus). Inocula, reactor configurations, and substrates influence the microbial communities. This is the first joint effort that evaluates hydrogen-producing reactors and operational conditions from different countries and contributes to understand the dark fermentation process.
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Acknowledgments
This work was performed in the frame of the Bio-hydrogen Latin America network. The following projects and institutions funded this work: ANII project FSE 6437 and FSE 102488 (Uruguay), SEP-CONACYT 240087 (UNAM, México), PAPIIT project IT 100113 (DGAPA-UNAM, México), SEP-CONACYT 132483 (IPICYT, México), KBBE-7PM GRAIL 613667 (Chile). L.F. and J.W. are funded by ANII-Uruguay grants.
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Etchebehere, C., Castelló, E., Wenzel, J. et al. Microbial communities from 20 different hydrogen-producing reactors studied by 454 pyrosequencing. Appl Microbiol Biotechnol 100, 3371–3384 (2016). https://doi.org/10.1007/s00253-016-7325-y
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DOI: https://doi.org/10.1007/s00253-016-7325-y