Journal
BIORESOURCE TECHNOLOGY
Volume 239, Issue -, Pages 244-249Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.biortech.2017.05.019
Keywords
Biofuel; Clostridium autoethanogenum; Mixed cultures; Polyhydroxyalkanoates; Syngas fermentation
Funding
- Spanish Ministry of Economy and Competitiveness (MINECO)
- European FEDER funds [CTQ2013-45581-R]
- Xunta de Galicia (Spain) [ED481B 2016/195-0]
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Syngas bioconversion is a promising method for bioethanol production, but some VFA remains at the end of fermentation. A two-stage process was set-up, including syngas fermentation as first stage under strict anaerobic conditions using C. autoethanogenum as inoculum, with syngas (CO/CO2/H-2/N-2, 30/10/20/40) as gaseous substrate. The second stage consisted in various fed-batch assays using a highly enriched PHA accumulating biomass as inoculum, where the potential for biopolymer production from the remaining acetic acid at the end of the syngas fermentation was evaluated. All of the acetic acid was consumed and accumulated as biopolymer, while ethanol and 2,3-butanediol remained basically unused. It can be concluded that a high C/N ratio in the effluent from the syngas fermentation stage was responsible for non-consumption of alcohols. A maximum PHA content of 24% was reached at the end of the assay. (C) 2017 Elsevier Ltd. All rights reserved.
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