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Inhibition of hydrogen-yielding dark fermentation by ascomycetous yeasts

Detman, Anna and Chojnacka, Aleksandra and Mielecki, Damian and Błaszczyk, Mieczysław and Sikora, Anna (2018) Inhibition of hydrogen-yielding dark fermentation by ascomycetous yeasts. International Journal of Hydrogen Energy, 43 (24). pp. 10967-10979.

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Official URL: https://www.sciencedirect.com/science/article/pii/...


Hydrogen-yielding fermentation conducted in bioreactors is an alternative method of hydrogen production. However, unfavourable processes can seriously inhibit bio-hydrogen generation during the acidogenic step of anaerobic digestion. Here, ascomycetous yeasts were identified as a major factor inhibiting the production of bio-hydrogen by fermentation.Changes in the performance of hydrogen-producing bioreactors including metabolic shift,quantitative changes in the fermentation products, decreased pH, instability of the microbialcommunity and consequently a dramatic drop in bio-hydrogen yield were observed following yeast infection. Ascomycetous yeasts from the genera Candida, Kazachstania and Geotrichum were isolated from hydrogen-producing bioreactors. Yeast metabolites secreted into the growth medium showed antibacterial activity. Our studies indicate that yeast infection of hydrogen-producing microbial communities is one of the serious obstacles to use dark fermentation as an alternative method of bio-hydrogen production. It also explains why studies on hydrogen fermentation are still limited to the laboratory or pilot-scale systems.

Item Type:Article
Subjects:Q Science > QR Microbiology
ID Code:1581
Deposited By: Dr Anna Sikora
Deposited On:12 Oct 2018 10:21
Last Modified:12 Oct 2018 10:21

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