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Semicontinuous diffusion fermentation of fodder beets for fuel ethanol and cubed protein feed production

Semicontinuous diffusion fermentation of fodder beets for fuel ethanol and cubed protein feed... 10.1002/bit.260310710.abs A novel, semicontinuous diffusion fermentation system was used to produce fuel ethanol and a cubed protein feed (CPF) from fodder beets at an intermediate scale. In the process, fodder beet cubes were augered diagonally upward against a flow of 0.26N H2SO4 and yeast in a tubular fermentor. Exiting one end of the fermentor was CPF, while fermented beer (6–9% (v/v) ethanol) exited the other end. Retention times for beer and CPF were 264 and 72 h, respectively. Contamination was controlled by maintaining the fermentation pH between 2.1 and 2.6 using H2SO4. Production costs for a greatly scaled‐up (times 1400) conceptual version of this system (using a continuous rather than a semicontinuous processing mode) were projected by calculation to be $0.529/L for 95% ethanol (net of a $0.112/L credit for CPF). The calculated energy balance (energy output‐energy input ratio) was estimated to be 3.04. In calculating the energy balance, the output energy of the CPF and input energy for growing the fodder beets were not included. A design for the scaled‐up plant is provided. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Biotechnology and Bioengineering Wiley

Semicontinuous diffusion fermentation of fodder beets for fuel ethanol and cubed protein feed production

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References (26)

Publisher
Wiley
Copyright
Copyright © 1988 John Wiley & Sons, Inc.
ISSN
0006-3592
eISSN
1097-0290
DOI
10.1002/bit.260310710
pmid
18584666
Publisher site
See Article on Publisher Site

Abstract

10.1002/bit.260310710.abs A novel, semicontinuous diffusion fermentation system was used to produce fuel ethanol and a cubed protein feed (CPF) from fodder beets at an intermediate scale. In the process, fodder beet cubes were augered diagonally upward against a flow of 0.26N H2SO4 and yeast in a tubular fermentor. Exiting one end of the fermentor was CPF, while fermented beer (6–9% (v/v) ethanol) exited the other end. Retention times for beer and CPF were 264 and 72 h, respectively. Contamination was controlled by maintaining the fermentation pH between 2.1 and 2.6 using H2SO4. Production costs for a greatly scaled‐up (times 1400) conceptual version of this system (using a continuous rather than a semicontinuous processing mode) were projected by calculation to be $0.529/L for 95% ethanol (net of a $0.112/L credit for CPF). The calculated energy balance (energy output‐energy input ratio) was estimated to be 3.04. In calculating the energy balance, the output energy of the CPF and input energy for growing the fodder beets were not included. A design for the scaled‐up plant is provided.

Journal

Biotechnology and BioengineeringWiley

Published: May 1, 1988

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