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Effect of reduction in yeast and enzyme concentrations in a simultaneous-saccharification-and-fermentation-based bioethanol process - Technical and economic evaluation

Wingren, Anders LU ; Galbe, Mats LU ; Roslander, Christian LU ; Rudolf, Andreas LU and Zacchi, Guido LU (2005) In Applied Biochemistry and Biotechnology 122(1-3). p.485-499
Abstract
The ethanol production cost in a simultaneous saccharification and fermentation-based bioethanol process is influenced by the requirements for yeast production and for enzymes. The main objective of this study was to evaluate-technically and economically-the influence of these two factors on the production cost. Abase case with 5 g/L of baker's yeast and an initial concentration of water-insoluble solids of 5% resulted in an experimental yield of 85%. When these data were implemented in Aspen Plus, yeast was assumed to be produced from sugars in the hydrolysate, reducing the overall ethanol yield to 69%. The ethanol production cost was 4.80 SEK/L (2.34 US$/gal). When adapted yeast was used at 2 g/L, an experimental yield of 74% was... (More)
The ethanol production cost in a simultaneous saccharification and fermentation-based bioethanol process is influenced by the requirements for yeast production and for enzymes. The main objective of this study was to evaluate-technically and economically-the influence of these two factors on the production cost. Abase case with 5 g/L of baker's yeast and an initial concentration of water-insoluble solids of 5% resulted in an experimental yield of 85%. When these data were implemented in Aspen Plus, yeast was assumed to be produced from sugars in the hydrolysate, reducing the overall ethanol yield to 69%. The ethanol production cost was 4.80 SEK/L (2.34 US$/gal). When adapted yeast was used at 2 g/L, an experimental yield of 74% was achieved and the estimated ethanol production cost was the same as in the base case. A 50% reduction in enzyme addition resulted in an increased production cost, to 5.06 SEK/L (2.47 US$/gal) owing to reduced ethanol yield. (Less)
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author
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Contribution to journal
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published
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in
Applied Biochemistry and Biotechnology
volume
122
issue
1-3
pages
485 - 499
publisher
Humana Press
external identifiers
  • wos:000229975200044
  • scopus:18844409134
ISSN
1559-0291
language
English
LU publication?
yes
id
afeda86d-8b06-46f8-89f6-fac0e39c1271 (old id 151660)
alternative location
http://www.ingentaconnect.com/content/hum/abab
http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=pubmed&dopt=Abstract&list_uids=15920258&query_hl=2&itool=pubmed_docsum
date added to LUP
2007-06-25 16:45:59
date last changed
2017-09-24 03:28:32
@article{afeda86d-8b06-46f8-89f6-fac0e39c1271,
  abstract     = {The ethanol production cost in a simultaneous saccharification and fermentation-based bioethanol process is influenced by the requirements for yeast production and for enzymes. The main objective of this study was to evaluate-technically and economically-the influence of these two factors on the production cost. Abase case with 5 g/L of baker's yeast and an initial concentration of water-insoluble solids of 5% resulted in an experimental yield of 85%. When these data were implemented in Aspen Plus, yeast was assumed to be produced from sugars in the hydrolysate, reducing the overall ethanol yield to 69%. The ethanol production cost was 4.80 SEK/L (2.34 US$/gal). When adapted yeast was used at 2 g/L, an experimental yield of 74% was achieved and the estimated ethanol production cost was the same as in the base case. A 50% reduction in enzyme addition resulted in an increased production cost, to 5.06 SEK/L (2.47 US$/gal) owing to reduced ethanol yield.},
  author       = {Wingren, Anders and Galbe, Mats and Roslander, Christian and Rudolf, Andreas and Zacchi, Guido},
  issn         = {1559-0291},
  language     = {eng},
  number       = {1-3},
  pages        = {485--499},
  publisher    = {Humana Press},
  series       = {Applied Biochemistry and Biotechnology},
  title        = {Effect of reduction in yeast and enzyme concentrations in a simultaneous-saccharification-and-fermentation-based bioethanol process - Technical and economic evaluation},
  volume       = {122},
  year         = {2005},
}