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 C, 1.84 mL hydrogen peroxide/g
bagasse) and hydrolysis conditions (3.5 FPU/g bagasse of cellulase and 25 CBU/g bagasse of b-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.