Improvement of the bioethanol production process from rice husks

ARISMENDY, A.M.; FELISSIA F. E.; MENDIETA, C. M.; CHAMORRO, E. R.; AREA, M.C.

CELLULOSE CHEMISTRY AND TECHNOLOGY

EDITURA ACAD ROMANE

Lugar: RUMANIA; Año: 2020 vol. 54 p. 689 - 698

0576-9787

This work aims to compare the production of bioethanol from rice husk through the simultaneous hydrolysis and fermentation process (SSF) and the hydrolysis followed by fermentation process (SHF). The raw material was pretreated under mild conditions with sodium hydroxide. Initially, the influence of the particle size was evaluated, using the enzymatic hydrolysis of the pretreated milled and unmilled husk. Subsequently, the efficiencies of Saccharomyces cerevisiae IMR 1181 (SC 1181) and Saccharomyces cerevisiae IMR 1507 (SC 1507) yeasts were compared using the SSF process. Finally, the SSF and SHF processes were compared using the SC 1181 yeast. Although little more glucose is generated with the ground husk (36.6% vs. 35.5%), grinding costs have to be considered. The SC1507 yeast performed best at all times. Bioethanol yields for SHF and SSF with SC 1181 were 35.3% and 38.2%, respectively. Maximum yields in SSF were 43.9% for SC 1507 and 38% for SC 1181.