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Cultivation Strategies of Clostridium autoethanogenum on Xylose and Carbon Monoxide Combination

Marcel Mann,G. Munch,L. Regestein,L. Rehmann

Published 2020 in ACS Sustainable Chemistry & Engineering

ABSTRACT

Clostridium autoethanogenum is capable of converting C1 carbon sources such as CO and CO2, as well as C5 carbon sources such as xylose, into various products, rendering it suitable for syngas conversion. However, pure gas fermentations generally have low volumetric productivity caused by low cell mass concentrations, resulting from low specific growth rates and low gas–liquid mass transfer. The strong dependency on gas–liquid mass transfer causes data generated in serum bottles to often deviate from experiments in stirred tank reactors. This study therefore characterizes growth and product formation in both the serum bottle and stirred tank reactor, while investigating a sequential and simultaneous feeding of xylose and gaseous carbon substrates. The ratio of the product was shown to be independent of the initial xylose concentration in serum bottles, while in stirred tank reactor experiments the product ratio changed under xylose-limited conditions. The product ethanol caused inhibiting effects which cou...

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