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Influence of different SSF conditions on ethanol production from corn stover at high solids loadings

Gladis, Arne; Bondesson, Pia-Maria LU ; Galbe, Mats LU and Zacchi, Guido LU (2015) In Energy Science & Engineering 3(5). p.481-489
Abstract
In this study, three different kinds of simultaneous saccharification and fermentation (SSF) of washed pretreated corn stover with water-insoluble solids (WIS) content of 20% were investigated to find which one resulted in highest ethanol yield at high-solids loadings. The different methods were batch SSF, prehydrolysis followed by batch SSF and fed-batch SSF. Batch-SSF resulted in an ethanol yield of 75–76% and an ethanol concentration of 53 g/L. Prehydrolysis prior to batch SSF did not improve the ethanol yield compared with batch SSF. Fed-batch SSF, on the other hand, increased the yield, independent of the feeding conditions used (79–81%, 57–60 g/L). If the initial amount of solids during fed-batch SSF was lowered, the yield could be... (More)
In this study, three different kinds of simultaneous saccharification and fermentation (SSF) of washed pretreated corn stover with water-insoluble solids (WIS) content of 20% were investigated to find which one resulted in highest ethanol yield at high-solids loadings. The different methods were batch SSF, prehydrolysis followed by batch SSF and fed-batch SSF. Batch-SSF resulted in an ethanol yield of 75–76% and an ethanol concentration of 53 g/L. Prehydrolysis prior to batch SSF did not improve the ethanol yield compared with batch SSF. Fed-batch SSF, on the other hand, increased the yield, independent of the feeding conditions used (79–81%, 57–60 g/L). If the initial amount of solids during fed-batch SSF was lowered, the yield could be improved to some extent. When decreasing the enzyme dosage, the greatest decrease in yield was seen in the fed-batch mode (75%), while lower or the same yield was seen in batch mode with and without prehydrolysis (73%). This resulted in similar ethanol yields in all methods. However, the residence time to achieve the final ethanol yield was shorter using fed-batch. This shows that fed-batch can be a better alternative also at a lower enzyme loading. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
Fed-batch; prehydrolysis; solid loading; SSF; steam pretreatment
in
Energy Science & Engineering
volume
3
issue
5
pages
481 - 489
external identifiers
  • scopus:84992205487
DOI
10.1002/ese3.83
language
English
LU publication?
yes
id
19f52858-80d0-44e8-8763-c4221c695441
date added to LUP
2016-10-04 08:54:27
date last changed
2017-10-22 05:20:04
@article{19f52858-80d0-44e8-8763-c4221c695441,
  abstract     = {In this study, three different kinds of simultaneous saccharification and fermentation (SSF) of washed pretreated corn stover with water-insoluble solids (WIS) content of 20% were investigated to find which one resulted in highest ethanol yield at high-solids loadings. The different methods were batch SSF, prehydrolysis followed by batch SSF and fed-batch SSF. Batch-SSF resulted in an ethanol yield of 75–76% and an ethanol concentration of 53 g/L. Prehydrolysis prior to batch SSF did not improve the ethanol yield compared with batch SSF. Fed-batch SSF, on the other hand, increased the yield, independent of the feeding conditions used (79–81%, 57–60 g/L). If the initial amount of solids during fed-batch SSF was lowered, the yield could be improved to some extent. When decreasing the enzyme dosage, the greatest decrease in yield was seen in the fed-batch mode (75%), while lower or the same yield was seen in batch mode with and without prehydrolysis (73%). This resulted in similar ethanol yields in all methods. However, the residence time to achieve the final ethanol yield was shorter using fed-batch. This shows that fed-batch can be a better alternative also at a lower enzyme loading.},
  author       = {Gladis, Arne and Bondesson, Pia-Maria and Galbe, Mats and Zacchi, Guido},
  keyword      = {Fed-batch; prehydrolysis; solid loading; SSF; steam pretreatment},
  language     = {eng},
  number       = {5},
  pages        = {481--489},
  series       = {Energy Science & Engineering},
  title        = {Influence of different SSF conditions on ethanol production from corn stover at high solids loadings},
  url          = {http://dx.doi.org/10.1002/ese3.83},
  volume       = {3},
  year         = {2015},
}