BioChem - DOS

Techno-economic assessment of high-solid simultaneous saccharification and fermentation and economic impacts of yeast consortium and on-site enzyme production technologies

Energy : technologies, resources, reserves, demands, impact, conservation, management, policy

Khajeeram, Sutamat; Unrean, Pornkamol

<P><B>Abstract</B></P> <P>An efficient simultaneous saccharification and fermentation (SSF) at high-solid loading are keys to the successful commercialization of lignocellulose-based process. In the present work, technological and economical potentials of high-solid SSF for sugarcane bagasse-to-ethanol conversion process [6] was analyzed based on process flowsheet simulation for an estimation of the minimal ethanol selling price (MESP). Based on techno-economic assessment a high-solid SSF process platform for a low-cost lignocellulosic ethanol production was designed composing of (1) yeast consortium for C<SUB>5</SUB> and C<SUB>6</SUB> sugars co-fermentation and (2) cellulase/on-site hemicellulase enzyme mixtures acting synergistically for efficient saccharification. Implementing the integrated SSF process with on-site enzymes and yeast consortium, the MESP could be reduced to as low as 15.7 Baht/L equivalent to 1.66 USD/gal which is a 6% lower than the current market selling price of 1.76 USD/gal. Thus, the on-site enzymes together with cellulase-hemicellulase synergism to lower enzyme demand as well as the yeast consortium technology to increase ethanol titer from C<SUB>5</SUB>/C<SUB>6</SUB> co-fermentation would provide economic feasibility for the future cellulosic ethanol production in the industrial scale. Such process platform is also an important strategy for the development of low-cost biorefinery industry that can outperform the current sugar-based process for the production of biofuels.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Comparative techno-economic assessment of high-solid SSF processes was performed. </LI> <LI> Low-cost SSF process was designed with yeast consortium and on-site enzymes mixture. </LI> <LI> Designed SSF provided economic feasibility with $1.66/gal minimal ethanol price. </LI> </UL> </P>

2017

Elsevier

0360-5442

1873-6785

122

pp.194-203

10.1016/j.energy.2017.01.090

http://click.ndsl.kr/servlet/OpenAPIDetailView?keyValue=05787966&target=NART&cn=NART77608728

High-solid SSF; On-site enzymes; Cellulase and hemicellulase synergism; Yeast consortium technology; Techno-economic analysis