Agricultural and Biosystems Engineering, Food Science and Human Nutrition, Biorenewable Resources and Technology, Environmental Science, Sustainable Agriculture, Center for Bioplastics and Biocomposites, Center for Crops Utilization Research
Journal or Book Title
Research Focus Area(s)
Biological and Process Engineering and Technology
While fermentation is usually done at a fixed temperature, in this study, the effect of having a controlled variable temperature was analyzed. A nonlinear system was used to model batch ethanol fermentation, using corn as substrate and the yeast Saccharomyces cerevisiae, at five different fixed and controlled variable temperatures. The lower temperatures presented higher ethanol yields but took a longer time to reach equilibrium. Higher temperatures had higher initial growth rates, but the decay of yeast cells was faster compared to the lower temperatures. However, in a controlled variable temperature model, the temperature decreased with time with the initial value of 40 ∘ C. When analyzing a time window of 60 h, the ethanol production increased 20% compared to the batch with the highest temperature; however, the yield was still 12% lower compared to the 20 ∘ C batch. When the 24 h’ simulation was analyzed, the controlled model had a higher ethanol concentration compared to both fixed temperature batches.
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Souza, Augusto C. M.; Mousaviraad, Mohammad; Mapoka, Kenneth O. M.; and Rosentrater, Kurt A., "Kinetic Modeling of Corn Fermentation with S. cerevisiae Using a Variable Temperature Strategy" (2018). Agricultural and Biosystems Engineering Publications. 931.