Agricultural and Biosystems Engineering Publications

Campus Units

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

Document Type

Article

Publication Version

Published Version

Publication Date

4-24-2018

Journal or Book Title

Bioengineering

Volume

5

Issue

2

First Page

34

Research Focus Area(s)

Biological and Process Engineering and Technology

DOI

10.3390/bioengineering5020034

Abstract

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.

Comments

This article is published as Souza, A. C. M., M. Mousaviraad, K. O. M. Mapoka, and K. A. Rosentrater. "Kinetic Modeling of Corn Fermentation with S. cerevisiae Using a Variable Temperature Strategy." Bioengineering 5, no. 2 (2018): 34. DOI: 10.3390/bioengineering5020034. Posted with permission.

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Open

Creative Commons License

Creative Commons Attribution 4.0 License
This work is licensed under a Creative Commons Attribution 4.0 License.

Copyright Owner

The Authors

Language

en

File Format

application/pdf

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