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Introducing low-quality feedstocks in bioethanol production: efficient conversion of the lignocellulose fraction of animal bedding through steam pretreatment

Sanchis Sebastia, Miguel LU orcid ; Erdei, Borbala LU ; Kovacs, Krisztina LU ; Galbe, Mats LU and Wallberg, Ola LU orcid (2019) In Biotechnology for Biofuels 12.
Abstract
Background
Animal bedding remains an underutilized source of raw material for bioethanol production, despite the economic and environmental benefits of its use. Further research concerning the optimization of the production process is needed, as previously tested pretreatment methods have not increased the conversion efficiency to the levels necessary for commercialization of the process.

Results
We propose steam pretreatment of animal bedding, consisting of a mixture of straw and cow manure, to deliver higher ethanol yields. The temperature, residence time and pH were optimized through response-surface modeling, where pretreatment was evaluated based on the ethanol yield obtained through simultaneous saccharification and... (More)
Background
Animal bedding remains an underutilized source of raw material for bioethanol production, despite the economic and environmental benefits of its use. Further research concerning the optimization of the production process is needed, as previously tested pretreatment methods have not increased the conversion efficiency to the levels necessary for commercialization of the process.

Results
We propose steam pretreatment of animal bedding, consisting of a mixture of straw and cow manure, to deliver higher ethanol yields. The temperature, residence time and pH were optimized through response-surface modeling, where pretreatment was evaluated based on the ethanol yield obtained through simultaneous saccharification and fermentation of the whole pretreated slurry. The results show that the best conditions for steam pretreatment are 200 °C, for 5 min at pH 2, at which an ethanol yield of about 70% was obtained. Moreover, the model also showed that the pH had the greatest influence on the ethanol yield, followed by the temperature and then the residence time.

Conclusions
Based on these results, it appears that steam pretreatment could unlock the potential of animal bedding, as the same conversion efficiencies were achieved as for higher-quality feedstocks such as wheat straw. (Less)
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author
; ; ; and
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
Animal bedding, Steam pretreatment, Bioethanol, Response-surface modelling
in
Biotechnology for Biofuels
volume
12
article number
215
publisher
BioMed Central (BMC)
external identifiers
  • scopus:85072262862
  • pmid:31528203
ISSN
1754-6834
DOI
10.1186/s13068-019-1558-9
language
English
LU publication?
yes
id
35123ef9-b100-4f82-8cdd-94ad26ff6fa2
date added to LUP
2019-09-11 09:18:43
date last changed
2023-11-19 13:53:09
@article{35123ef9-b100-4f82-8cdd-94ad26ff6fa2,
  abstract     = {{Background<br/>Animal bedding remains an underutilized source of raw material for bioethanol production, despite the economic and environmental benefits of its use. Further research concerning the optimization of the production process is needed, as previously tested pretreatment methods have not increased the conversion efficiency to the levels necessary for commercialization of the process.<br/><br/>Results<br/>We propose steam pretreatment of animal bedding, consisting of a mixture of straw and cow manure, to deliver higher ethanol yields. The temperature, residence time and pH were optimized through response-surface modeling, where pretreatment was evaluated based on the ethanol yield obtained through simultaneous saccharification and fermentation of the whole pretreated slurry. The results show that the best conditions for steam pretreatment are 200 °C, for 5 min at pH 2, at which an ethanol yield of about 70% was obtained. Moreover, the model also showed that the pH had the greatest influence on the ethanol yield, followed by the temperature and then the residence time.<br/><br/>Conclusions<br/>Based on these results, it appears that steam pretreatment could unlock the potential of animal bedding, as the same conversion efficiencies were achieved as for higher-quality feedstocks such as wheat straw.}},
  author       = {{Sanchis Sebastia, Miguel and Erdei, Borbala and Kovacs, Krisztina and Galbe, Mats and Wallberg, Ola}},
  issn         = {{1754-6834}},
  keywords     = {{Animal bedding; Steam pretreatment; Bioethanol; Response-surface modelling}},
  language     = {{eng}},
  month        = {{09}},
  publisher    = {{BioMed Central (BMC)}},
  series       = {{Biotechnology for Biofuels}},
  title        = {{Introducing low-quality feedstocks in bioethanol production: efficient conversion of the lignocellulose fraction of animal bedding through steam pretreatment}},
  url          = {{http://dx.doi.org/10.1186/s13068-019-1558-9}},
  doi          = {{10.1186/s13068-019-1558-9}},
  volume       = {{12}},
  year         = {{2019}},
}