Valorization of sugarcane bagasse through biofuel and value-added soluble metabolites production: Optimization of alkaline hydrothermal pretreatment

Autor(es)

Soares, Lais A. ; Solano, Magnolia G. ; Lindeboom, Ralph E. F. ; Lier, Jules B. van ; Silva, Edson L. ; Varesche, Maria B. A.

• Tipo de documento: Artigo Científico
• Fonte: BIOMASS & BIOENERGY; v. 165, p. 7-pg., 2022-08-26.

Resumo

Sugarcane bagasse (SCB) is increasingly considered as a potential source for bioenergy or bulk chemicals pro-duction. However, efficient pretreatment techniques need to be developed to make full use of its potential. A central composite design was employed to evaluate the effect of temperature (146.4-213.6 C), NaOH con-centration (0.7-2.3 M) and treatment time (3.2-36.8 min) on the hydrothermal pretreatment of SCB. Glucose was the abundant fermentable sugar released in the hydrolysate (4.0 g/L) and its concentration was significantly (p-value < 0.05) affected by temperature and NaOH concentration. Sugars released in the hydrolysate and the remaining cellulose, hemicellulose, and lignin in the pretreated fiber were anaerobically co-digested in batch thermophilic assays (55 C). Propionate, one of the most promising platform chemicals, was the main metabolite produced (0.5 g/L) and its concentration was significantly affected by temperature and NaOH concentration. Both NaOH concentration and pretreatment duration significantly affected methane composition in the biogas (p-value < 0.05 and 0,10 respectively). Defluviitoga, and Methanothermobacter genera were favored in response to alkaline hydrothermal pretreatment at the central point conditions (180 C, 1.5 M NaOH, 20 min). (AU)

• Processo FAPESP: 18/25748-1 - Prétratamentos hidrotérmico, solar e laser e digestão em alta pressão para otimizar a bioconversão do bagaço de cana-de-açúcar e recuperação de químicos de alto valor
• Beneficiário: Laís Américo Soares
• Modalidade de apoio: Bolsas no Exterior - Estágio de Pesquisa - Pós-Doutorado
• Processo FAPESP: 17/07194-6 - Análise integrada da degradação de bagaço de cana de açúcar e licor de pentoses em reator anaeróbio de leito fixo compartimentado termofílico
• Beneficiário: Laís Américo Soares
• Modalidade de apoio: Bolsas no Brasil - Pós-Doutorado
• Processo FAPESP: 15/06246-7 - Aplicação do conceito de biorrefinaria a estações de tratamento biológico de águas residuárias: o controle da poluição ambiental aliado à recuperação de matéria e energia
• Beneficiário: Marcelo Zaiat
• Modalidade de apoio: Auxílio à Pesquisa - Temático