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Recycling of process streams in ethanol production from softwoods based on enzymatic hydrolysis

Stenberg, K; Tengborg, C; Galbe, Mats LU ; Zacchi, Guido LU ; Palmqvist, E and Hahn-Hägerdal, Bärbel LU (1998) In Applied Biochemistry and Biotechnology 70-2. p.697-708
Abstract
In ethanol production from lignocellulose by enzymatic hydrolysis and fermentation, it is desirable to minimize addition of fresh-water and waste-water streams, which leads to an accumulation of substances in the process. This study shows that the amount of fresh water used and the amount of waste water thereby produced in the production of fuel ethanol from softwood, can be reduced to a large extent by recycling of either the stillage stream or part of the liquid stream from the fermenter. A reduction in fresh-water demand of more than 50%, from 3 kg/kg dry raw material to 1.5 kg/kg dry raw material was obtained without any negative effects on either hydrolysis or fermentation. A further decrease in the amount of fresh water, to... (More)
In ethanol production from lignocellulose by enzymatic hydrolysis and fermentation, it is desirable to minimize addition of fresh-water and waste-water streams, which leads to an accumulation of substances in the process. This study shows that the amount of fresh water used and the amount of waste water thereby produced in the production of fuel ethanol from softwood, can be reduced to a large extent by recycling of either the stillage stream or part of the liquid stream from the fermenter. A reduction in fresh-water demand of more than 50%, from 3 kg/kg dry raw material to 1.5 kg/kg dry raw material was obtained without any negative effects on either hydrolysis or fermentation. A further decrease in the amount of fresh water, to one-fourth of what was used without recycling of process streams, resulted in a considerable decrease in the ethanol productivity and a slight decrease in the ethanol yield. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
ethanol production, recycling, softwood, inhibition, steam pretreatment
in
Applied Biochemistry and Biotechnology
volume
70-2
pages
697 - 708
publisher
Humana Press
external identifiers
  • wos:000073769000065
  • pmid:18576034
  • scopus:0031829859
ISSN
1559-0291
DOI
10.1007/BF02920181
language
English
LU publication?
yes
id
dd12aa47-e8aa-43c2-89ab-8cf21c4b811f (old id 3911451)
date added to LUP
2013-06-28 14:17:56
date last changed
2017-01-01 05:03:37
@article{dd12aa47-e8aa-43c2-89ab-8cf21c4b811f,
  abstract     = {In ethanol production from lignocellulose by enzymatic hydrolysis and fermentation, it is desirable to minimize addition of fresh-water and waste-water streams, which leads to an accumulation of substances in the process. This study shows that the amount of fresh water used and the amount of waste water thereby produced in the production of fuel ethanol from softwood, can be reduced to a large extent by recycling of either the stillage stream or part of the liquid stream from the fermenter. A reduction in fresh-water demand of more than 50%, from 3 kg/kg dry raw material to 1.5 kg/kg dry raw material was obtained without any negative effects on either hydrolysis or fermentation. A further decrease in the amount of fresh water, to one-fourth of what was used without recycling of process streams, resulted in a considerable decrease in the ethanol productivity and a slight decrease in the ethanol yield.},
  author       = {Stenberg, K and Tengborg, C and Galbe, Mats and Zacchi, Guido and Palmqvist, E and Hahn-Hägerdal, Bärbel},
  issn         = {1559-0291},
  keyword      = {ethanol production,recycling,softwood,inhibition,steam pretreatment},
  language     = {eng},
  pages        = {697--708},
  publisher    = {Humana Press},
  series       = {Applied Biochemistry and Biotechnology},
  title        = {Recycling of process streams in ethanol production from softwoods based on enzymatic hydrolysis},
  url          = {http://dx.doi.org/10.1007/BF02920181},
  volume       = {70-2},
  year         = {1998},
}