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

Autor(es)

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

Afiliação do(s) autor(es)

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

• Tipo de documento: Artigo Científico
• Fonte: FUEL; v. 136, p. 349-357, NOV 15 2014.
• Citações Web of Science: 43

Resumo

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)

• Processo FAPESP: 07/01525-9 - Avaliação de pré-tratamentos e modelagem da hidrólise enzimática do bagaço de cana-de-açúcar para produção de etanol
• Beneficiário: Sarita Candida Rabelo
• Modalidade de apoio: Bolsas no Brasil - Doutorado