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Title: Alkali pretreatment of softwood spruce and hardwood birch by NaOH/thiourea, NaOH/urea, NaOH/urea/thiourea, and NaOH/PEG for improve of ethanol and biogas production
Authors: Mohsenzadeh, A.
Jeihanipour, A.
Karimi, K.
Taherzadeh, M.J.
Department: University of Borås. School of Engineering
Issue Date: 2012
Journal Title: Journal of Chemical Technology and Biotechnology
ISSN: 0268-2575
Volume: 87
Issue: 8
Pages: 1209-1214
Publisher: John Wiley & Sons Ltd.
Publication type: article, peer reviewed scientific
Keywords: alkaline pretreatment
enzymatic hydrolysis
Subject Category: Subject categories::Engineering and Technology::Industrial Biotechnology
Research Group: Biotechnology
Area of Research: Resource Recovery
Strategic Research Area: Resource Recovery
Abstract: Alkali-dissolution pretreatment of softwood spruce and hardwood birch to improve ethanol and biogas production was investigated. The pretreatments were carried out at different temperatures between − 15 and 80 °C with NaOH/thiourea (7/5.5 wt%), NaOH/urea (7/12 wt%), NaOH/urea/thiourea (7/8/6.5 wt%), and NaOH/PEG (7/1 wt%) aqueous solutions. The pretreated materials were then subjected to enzymatic hydrolysis for 72 h. The pretreatments by NaOH/thiourea at − 15 °C improved the hydrolysis yields of spruce from 11.7% to 57% of theoretical yield, and for birch from 23.1% to 83% of theoretical yield. The enzymatic hydrolysis and fermentation of these pretreated materials by NaOH/thiourea with baker's yeast resulted in 54.0% of theoretical yield compared with 10.9% for untreated spruce and 80.9% of theoretical yield compared with 12.9% for untreated birch. Furthermore, anaerobic digestion of pretreated materials resulted in 0.36 L g−1 VS methane compared with 0.23 L g−1 VS for untreated birch, and 0.21 L g−1 VS compared with 0.03 L g−1 VS for untreated spruce.
DOI: 10.1002/jctb.3695
Sustainable development: sustainable development
Appears in Collections:Artiklar och rapporter / Articles and reports (IH)

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