Alkaline hydrogen peroxide pretreatment, enzymatic hydrolysis and fermentation of sugarcane bagasse to ethanol

Author(s)

Rabelo, Sarita C. ^[1] ; Andrade, Rafael R. ^[1] ; Maciel Filho, Rubens ^[1] ; Costa, Aline C. ^[1]

Affiliation

^[1] Univ Estadual Campinas, UNICAMP, Sch Chem Engn, BR-13083970 Campinas, SP - Brazil

• Document type: Journal article
• Source: FUEL; v. 136, p. 349-357, NOV 15 2014.
• Web of Science Citations: 43

Abstract

The pretreatment of sugarcane bagasse with alkaline hydrogen peroxide was evaluated for second generation ethanol production via enzymatic hydrolysis and fermentation using Saccharomyces cerevisiae. Factorial designs were used to determine the need for particle size reduction as well as to optimize pretreatment conditions and enzymes loadings in the hydrolysis. The influence of increasing solids loadings in the pretreatment and hydrolysis stages was determined; batch fermentation of pure hydrolysate, as well as continuous fermentation of hydrolysate concentrated with sugarcane molasses were performed. Furthermore, mass balances were used to determine the mass of ethanol obtained by mass of raw bagasse in different operational conditions. The pretreatment increased bagasse enzymatic digestibility without the need for prior size reduction. In the optimal pretreatment (1 h, 25 degrees C, 1.84 mL hydrogen peroxide/g bagasse) and hydrolysis conditions (3.5 FPU/g bagasse of cellulase and 25 CBU/g bagasse of beta-glucosidase), 416.7 kg glucose/ton of raw bagasse were obtained. Fermentation of pure hydrolysate led to an ethanol yield of 187.85 kg/ton of raw bagasse. (C) 2014 Elsevier Ltd. All rights reserved. (AU)

• FAPESP's process: 07/01525-9 - Evaluation of pre-treatment and modeling of enzymatic hydrolysis of sugar cane bagasse for ethanol production
• Grantee: Sarita Candida Rabelo
• Support Opportunities: Scholarships in Brazil - Doctorate