Title: Bioethanol production from C1 gases using alternative media by syngas fermentation

Authors: Mine Gungormusler; Nuri Azbar; Tugba Keskin

Addresses: Department of Genetics and Bioengineering, Izmir University of Economics, 35330, Izmir, Turkey ' Department of Bioengineering, Ege University, 35100, Izmir, Turkey ' Department of Environmental Protection Technologies, Izmir Democracy University, 35140, Izmir, Turkey

Abstract: The main aim of the present study was to evaluate the effects of the presence or absence of trace elements and yeast extract on growth and ethanol production by Clostridium ragsdalei grown on C1 gas dominated syngas (60% CO, 10% CO₂, 10% CH₄, 10% H₂, 10% N₂). Comparison of whey powder and glucose syrup as low-cost substitutes helped develop a more cost-effective medium formulation to produce ethanol from syngas with significantly higher yields, achieving up to a 3.8-fold improvement with co-utilisation of syngas and glucose syrup. In addition, the results provided further insights into medium manipulation and possible modifications to decrease total costs for increased ethanol production by solventogenic acetogens via syngas fermentation by achieving a 15.6% reduction in the cost of fermentation medium.

Keywords: bioethanol; syngas; C1 gases; clostridium ragsdalei; whey; glucose syrup; cost reduction; syngas fermentation; batch bioreactor; anaerobic; medium substitution; low cost nutrients.

DOI: 10.1504/IJGW.2022.125079

International Journal of Global Warming, 2022 Vol.28 No.1, pp.42 - 59

Received: 17 Sep 2021
Accepted: 24 Jan 2022
Published online: 25 Aug 2022 *

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