Decarbonizing ethanol production via gas fermentation

Impact of the CO/H2/CO2 mix source on greenhouse gas emissions and production costs

Journal Article (2022)
Author(s)

E.F. Almeida Benalcazar (TU Delft - BT/Biotechnology and Society, University of Campinas)

HJ Noorman (DSM, TU Delft - BT/Bioprocess Engineering)

Rubens Maciel Maciel Filho (University of Campinas)

J. Posada Duque (TU Delft - BT/Biotechnology and Society)

Research Group
BT/Bioprocess Engineering
Copyright
© 2022 E.F. Almeida Benalcazar, H.J. Noorman, Rubens Maciel Filho, J.A. Posada Duque
DOI related publication
https://doi.org/10.1016/j.compchemeng.2022.107670
More Info
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Publication Year
2022
Language
English
Copyright
© 2022 E.F. Almeida Benalcazar, H.J. Noorman, Rubens Maciel Filho, J.A. Posada Duque
Research Group
BT/Bioprocess Engineering
Volume number
159
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Abstract

This study explores key success factors for ethanol production via fermentation of gas streams, by assessing the effects of eight process variables driving the fermentation performance on the production costs and greenhouse gas emissions. Three fermentation feedstocks are assessed: off-gases from the steel industry, lignocellulosic biomass-derived syngas and a mixture of H2 and CO2. The analysis is done through a sequence of (i) sensitivity analyses based on stochastic simulations and (ii) multi-objective optimizations. In economic terms, the use of steel off-gas leads to the best performance and the highest robustness to low mass transfer coefficients, low microbial tolerance to ethanol, acetic-acid co-production and to dilution of the gas feed with CO2, due to the relatively high temperature at which the gas feedstock is available. The ethanol produced from the three feedstocks lead to lower greenhouse gas emissions than fossil-based gasoline and compete with first and second generation ethanol.