BioChem - DOS

Butanol production from hydrothermolysis-pretreated switchgrass: Quantification of inhibitors and detoxification of hydrolyzate

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

Liu, Kan; Atiyeh, Hasan K.; Pardo-Planas, Oscar; Ezeji, Thaddeus C.; Ujor, Victor; Overton, Jonathan C.; Berning, Kalli; Wilkins, Mark R.; Tanner, Ralph S.

<P><B>Abstract</B></P> <P>The present study evaluated butanol production from switchgrass based on hydrothermolysis pretreatment. The inhibitors present in the hydrolyzates were measured. Results showed poor butanol production (1g/L) with non-detoxified hydrolyzate. However, adjusting the pH of the non-detoxified hydrolyzate to 6 and adding 4g/L CaCO<SUB>3</SUB> increased butanol formation to about 6g/L. There was about 1g/L soluble lignin content (SLC), and various levels of furanic and phenolic compounds found in the non-detoxified hydrolyzate. Detoxification of hydrolyzates with activated carbon increased the butanol titer to 11g/L with a total acetone, butanol and ethanol (ABE) concentration of 17g/L. These results show the potential of butanol production from hydrothermolysis pretreated switchgrass.</P> <P><B>Highlights</B></P> <P> <UL> <LI> pH adjustment and CaCO<SUB>3</SUB> addition to switchgrass hydrolyzate improved ABE production. </LI> <LI> Switchgrass hydrolyzate contained both furanic and phenolic inhibitors. </LI> <LI> Activated carbon detoxification removed detected inhibitors except cinnamaldehyde. </LI> <LI> Detoxification of switchgrass hydrolyzate increased butanol titer from 1 to 11g/L. </LI> <LI> 17g/L total ABE was produced with detoxified hydrolyzate. </LI> </UL> </P>

2015

Elsevier

0960-8524

189

pp.292-301

10.1016/j.biortech.2015.04.018

http://click.ndsl.kr/servlet/OpenAPIDetailView?keyValue=05787966&target=NART&cn=NART72052684

Switchgrass; Hydrothermolysis; Butanol fermentation; Detoxification; Clostridium acetobutylicum ATCC 824