Acetogenic Fermentation From Oxygen Containing Waste Gas.

Autor: Mohr T; Technical Biology, Institute of Process Engineering in Life Science, Karlsruhe Institute of Technology, Karlsruhe, Germany., Infantes A; Technical Biology, Institute of Process Engineering in Life Science, Karlsruhe Institute of Technology, Karlsruhe, Germany., Biebinger L; Technical Biology, Institute of Process Engineering in Life Science, Karlsruhe Institute of Technology, Karlsruhe, Germany., de Maayer P; Faculty of Science, School of Molecular & Cell Biology, University of the Witwatersrand, Johannesburg, South Africa., Neumann A; Technical Biology, Institute of Process Engineering in Life Science, Karlsruhe Institute of Technology, Karlsruhe, Germany.
Jazyk: angličtina
Zdroj: Frontiers in bioengineering and biotechnology [Front Bioeng Biotechnol] 2019 Dec 20; Vol. 7, pp. 433. Date of Electronic Publication: 2019 Dec 20 (Print Publication: 2019).
DOI: 10.3389/fbioe.2019.00433
Abstrakt: The microbial production of bulk chemicals from waste gas is becoming a pertinent alternative to industrial strategies that rely on fossil fuels as substrate. Acetogens can use waste gas substrates or syngas (CO, CO 2 , H 2 ) to produce chemicals, such as acetate or ethanol, but as the feed gas often contains oxygen, which inhibits acetogen growth and product formation, a cost-prohibitive chemical oxygen removal step is necessary. Here, we have developed a two-phase microbial system to facilitate acetate production using a gas mixture containing CO and O 2 . In the first phase the facultative anaerobic carboxydotroph Parageobacillus thermoglucosidasius was used to consume residual O 2 and produce H 2 and CO 2 , which was subsequently utilized by the acetogen Clostridium ljungdahlii for the production of acetate. From a starting amount of 3.3 mmol of CO, 0.52 mmol acetate was produced in the second phase by C. ljungdahlii . In this set-up, the yield achieved was 0.16 mol acetate/mol CO, a 63% of the theoretical maximum. This system has the potential to be developed for the production of a broad range of bulk chemicals from oxygen-containing waste gas by using P. thermoglucosidasius as an oxygen scrubbing tool.
(Copyright © 2019 Mohr, Infantes, Biebinger, de Maayer and Neumann.)
Databáze: MEDLINE
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