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Erschienen in: Biomass Conversion and Biorefinery 6/2021

28.03.2020 | Original Article

Effect of different heat treatments of inoculum on the production of hydrogen and volatile fatty acids by dark fermentation of sugarcane vinasse

verfasst von: Flaviane Eva Magrini, Gabriela Machado de Almeida, Denis da Maia Soares, Laura Fuentes, Claudia Ecthebehere, Lademir Luiz Beal, Maurício Moura da Silveira, Suelen Paesi

Erschienen in: Biomass Conversion and Biorefinery | Ausgabe 6/2021

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Abstract

Vinasse the main residue of bioethanol production can be used as a substrate in microbiological processes to obtain value-added products. However, it is necessary to use a microbial consortium with high capacity to produce hydrogen (H2) and volatile fatty acids (VFA). There is no consensus on the best inoculum pretreatment to eliminate hydrogen-consuming bacteria. Thus, the present study evaluated the influence of three methods of heat pretreatment of the inoculum: T1 = 90 °C/10 min; T2 = 105 °C/120 min; T3 = 121 °C/20 min for the production of H2 and VFA using vinasse as substrate. The effect of the concentration of vinasse and the initial pH (5, 6 and 7) were also evaluated. The highest hydrogen production (821.34 mL) and yield (4.75 mmol H2 g−1 COD) was obtained using undiluted vinasse at pH 6 and T1 pretreatment. The highest number of copies of the Fe-hydrogenase genes confirms the higher H2 production. The presence of Clostridium and facultative anaerobic microorganisms Bacillus and Enterobacter in the microbial consortia were confirmed by isolation and PCR-DGGE. The highest production of VFA was obtained at pH 7 and T3 pretreatment. This study showed that dark fermentation could be driven by the inoculum pretreatment and pH selecting different process either for the production of H2 or VFA from vinasse in natura, without addition of supplements.

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Metadaten
Titel
Effect of different heat treatments of inoculum on the production of hydrogen and volatile fatty acids by dark fermentation of sugarcane vinasse
verfasst von
Flaviane Eva Magrini
Gabriela Machado de Almeida
Denis da Maia Soares
Laura Fuentes
Claudia Ecthebehere
Lademir Luiz Beal
Maurício Moura da Silveira
Suelen Paesi
Publikationsdatum
28.03.2020
Verlag
Springer Berlin Heidelberg
Erschienen in
Biomass Conversion and Biorefinery / Ausgabe 6/2021
Print ISSN: 2190-6815
Elektronische ISSN: 2190-6823
DOI
https://doi.org/10.1007/s13399-020-00687-0

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