BioChem - DOS

Co-fermentation of hemicellulose and starch from barley straw and grain for efficient pentoses utilization in acetone-butanol-ethanol production

Bioresource technology : biomass, bioenergy, biowastes, conversion technologies, biotransformations, production technologies

Yang, Ming; Kuittinen, Suvi; Zhang, Junhua; Vepsä lä inen, Jouko; Keinä nen, Markku; Pappinen, Ari

<P><B>Abstract</B></P> <P>This study aims to efficiently use hemicellulose-based biomass for ABE (acetone&ndash;butanol&ndash;ethanol) production by co-fermentation with starch-based biomass. Two processes were investigated: (I) co-fermentation of sugars derived from hemicellulose and starch in a mixture of barley straw and grain that was pretreated with dilute acid; (II) co-fermentation of straw hemicellulosic hydrolysate and gelatinized grain slurry in which the straw was pretreated with dilute acid. The two processes produced 11.3 and 13.5g/L ABE that contains 7.4 and 7.8g/L butanol, respectively. In process I, pretreatment with 1.0% H<SUB>2</SUB>SO<SUB>4</SUB> resulted in better ABE fermentability than with 1.5% H<SUB>2</SUB>SO<SUB>4</SUB>, but only 19% of pentoses were consumed. In process II, 95% of pentoses were utilized even in the hemicellulosic hydrolysate pretreated with more severe condition (1.5% H<SUB>2</SUB>SO<SUB>4</SUB>). The results suggest that process II is more favorable for hemicellulosic biomass utilization, and it is also attractive for sustainable biofuel production due to great biomass availability.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Two co-fermentations of hemicellulose and starch-based biomass were studied. </LI> <LI> Lower concentration of H<SUB>2</SUB>SO<SUB>4</SUB> resulted in good ABE fermentability in process I. </LI> <LI> Process II facilitated pentoses utilization during the fermentation. </LI> <LI> Process II could relieve the effect of inhibitors on fermentation. </LI> <LI> Process II is attractive for ABE production from hemicellulosic biomass. </LI> </UL> </P>

2015

Elsevier

0960-8524

179

pp.128-135

10.1016/j.biortech.2014.12.005

http://click.ndsl.kr/servlet/OpenAPIDetailView?keyValue=05787966&target=NART&cn=NART71285376

ABE (acetone&#x2013; butanol&#x2013; ethanol); Starch; Hemicellulose; Co-fermentation; Pentoses;