title: Optimization of sugarcane bagasse autohydrolysis for methane production from hemicellulose hydrolyzates in a biorefinery concept.
abstract: This study aimed to optimize through design of experiments, the process variables (temperature - T, time - t and solid-to-liquid ratio - SLR) for sugarcane bagasse (SB) autohydrolysis (AH) to obtain hemicellulose hydrolyzates (HH) prone to anaerobic digestion (AD) and biochemical methane production (BMP). The results indicated that severe AH conditions, which lead to maximum hemicelluloses dissolution and sugar content in the HH, were not the best for BMP, probably due to the accumulation of toxic/recalcitrant compounds (furans and lignin). Mild AH conditions (170°C, 35min and SLR=0.33) led to the highest BMP (0.79Nm(3)kg TOC(-1)), which was confirmed by the desirability tool. HH produced by AH carried out at the desired condition DC2 (178.6°C, 43.6min and SLR=0.24) showed the lowest accumulation of inhibitory compounds and volatile fatty acids (VFA) and highest BMP (1.56Nm(3)kg TOC(-1)). The modified Gompertz model best fit the experimental data and led to a maximum methane production rate (R) of 2.6mmol CH4d(-1) in the best condition.
authors.affiliation: Laboratório de Química Tecnológica e Ambiental, Departamento de Química, Instituto de Ciências Exatas e Biológicas, Universidade Federal de Ouro Preto, Campus Universitário Morro do Cruzeiro, s/n°, Bauxita, 35400-000 Ouro Preto, MG, Brazil. Electronic address: brunobaeta@iceb.ufop.br.
authors.forename: Bruno Eduardo Lôbo
authors.initials: BE
authors.lastname: Baêta
authors.affiliation: Laboratório de Química Tecnológica e Ambiental, Departamento de Química, Instituto de Ciências Exatas e Biológicas, Universidade Federal de Ouro Preto, Campus Universitário Morro do Cruzeiro, s/n°, Bauxita, 35400-000 Ouro Preto, MG, Brazil.
authors.forename: Diego Roberto Sousa
authors.initials: DR
authors.lastname: Lima
authors.affiliation: Laboratório de Química Tecnológica e Ambiental, Departamento de Química, Instituto de Ciências Exatas e Biológicas, Universidade Federal de Ouro Preto, Campus Universitário Morro do Cruzeiro, s/n°, Bauxita, 35400-000 Ouro Preto, MG, Brazil.
authors.forename: Oscar Fernando Herrera
authors.initials: OF
authors.lastname: Adarme
authors.affiliation: Laboratório de Química Tecnológica e Ambiental, Departamento de Química, Instituto de Ciências Exatas e Biológicas, Universidade Federal de Ouro Preto, Campus Universitário Morro do Cruzeiro, s/n°, Bauxita, 35400-000 Ouro Preto, MG, Brazil.
authors.forename: Leandro Vinícius Alves
authors.initials: LV
authors.lastname: Gurgel
authors.affiliation: Laboratório de Química Tecnológica e Ambiental, Departamento de Química, Instituto de Ciências Exatas e Biológicas, Universidade Federal de Ouro Preto, Campus Universitário Morro do Cruzeiro, s/n°, Bauxita, 35400-000 Ouro Preto, MG, Brazil.
authors.forename: Sérgio Francisco de
authors.initials: SF
authors.lastname: Aquino
mesh_terms: D056804:Biofuels; D001709:Biotechnology / Q000379:methods*; D002241:Carbohydrates / Q000096:biosynthesis; D002482:Cellulose / Q000737:chemistry / Q000378:metabolism; D005663:Furans / Q000378:metabolism; D006868:Hydrolysis; D008031:Lignin / Q000737:chemistry / Q000378:metabolism; D008697:Methane / Q000096:biosynthesis*; D011134:Polysaccharides / Q000737:chemistry / Q000378:metabolism*; D031786:Saccharum / Q000737:chemistry* / Q000378:metabolism; D013696:Temperature
chemical_list: D056804:Biofuels; D002241:Carbohydrates; D005663:Furans; D011134:Polysaccharides; C007916:hemicellulose; D002482:Cellulose; D008031:Lignin; C027433:bagasse; D008697:Methane
keywords: Anaerobic digestion; Autohydrolysis pretreatment; Biomethane; Hemicellulose hydrolyzate; Sugarcane bagasse