Improvement of ethanol production by extractive fed-batch fermentation in a drop column bioreactor
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RESEARCH PAPER
Improvement of ethanol production by extractive fed‑batch fermentation in a drop column bioreactor Diego A. Lemos1 · Jorge L. S. Sonego1 · Antonio J. G. Cruz1 · Alberto C. Badino1 Received: 28 May 2020 / Accepted: 21 July 2020 © Springer-Verlag GmbH Germany, part of Springer Nature 2020
Abstract The use of fed-batch extractive fermentation can overcome inhibitory effects caused by the substrate and ethanol to the yeast cells, since it allows regulate the substrate concentration and remove the product as it is produced. The present study describes the modelling and experimental validation of ethanol production in fed-batch extractive fermentation with in situ ethanol removal by oleic acid in a non-conventional drop column bioreactor (DCB) operated under industrial conditions. The model developed using the hybrid Andrews–Levenspiel equation and ethanol distribution coefficient parameter (KDE) provided an excellent description of the fed-batch extractive ethanol fermentation process with oleic acid. Furthermore, extractive fedbatch fermentation allowed the feed up to 306.6 kg m−3 of substrate (total reducing sugars), with total ethanol concentration in extractive fermentation in the ranging 100.3–139.8 kg m−3 (12.7–17.7 ºGL), 19.9–67.2% higher when compared with the conventional process without ethanol removal. Moreover, this process has the advantage of less effluent generated and energy consumption for ethanol recovery when compared to the conventional process. Keywords Bioethanol · Fed-batch extractive fermentation · Liquid–liquid extraction · Drop column bioreactor · High substrate concentration
Introduction The production of biofuels has been developed to reduce carbon dioxide emission and global warming, which has made the quest for alternative fuels a high priority. Bioethanol is a renewable and sustainable liquid fuel being produced by fermentation of sugars derived from mainly sugarcane and cornstarch. It is an alternative to reduce environmental and energy problems in the world and one of its main advantages is that it is a renewable source of energy that helps reduce greenhouse gas (GHG) emissions. The emission reduction is proportionally related to the decrease in the use of fossil fuels [1], as also the carbon dioxide emitted to the atmosphere is recaptured by the sugarcane that will grow in the next cycle. Moreover, of all available options, sugarcane ethanol is the most commercially successful product among biomass fuels currently produced [2]. Brazil is the second * Alberto C. Badino [email protected] 1
Chemical Engineering Graduate Program, Federal University of São Carlos, Rod. Washington Luís, km 235, São Carlos, SP 13565‑905, Brazil
largest bioethanol producer representing approximately 27% of the world supply [3]. According to data for the 2018/2019 harvest, 33.1 billion liters of ethanol were produced in Brazil [4]. In Brazilian distilleries, ethanol is produced by fermentation of sugarcane and around 85% of distilleries use the fed-batch mode for the fermentation process
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