Biobutanol production from sugarcane straw: Defining optimal biomass loading for improved ABE fermentation

Autor(es)

Pratto, Bruna ^{[1, 2]} ; Chandgude, Vijaya ^[2] ; de Sousa Junior, Ruy ^{[1, 3]} ; Goncalves Cruz, Antonio Jose ^{[1, 3]} ; Bankar, Sandip ^[2]

Afiliação do(s) autor(es)

^[1] Univ Fed Sao Carlos, Chem Engn Grad Program, Rod Washington Luis Km 235, BR-13565905 Sao Carlos, SP - Brazil

^[2] Aalto Univ, Sch Chem Engn, Dept Bioprod & Biosyst, POB 16100, FI-00076 Aalto - Finland

^[3] Univ Fed Sao Carlos, Chem Engn Dept, Rod Washington Luis Km 235, BR-13565905 Sao Carlos, SP - Brazil

• Tipo de documento: Artigo Científico
• Fonte: INDUSTRIAL CROPS AND PRODUCTS; v. 148, JUN 2020.
• Citações Web of Science: 0

Resumo

Key objective of this work was to evaluate the use of cellulosic fraction from sugarcane straw pretreated by liquid hot water (LHW) for butanol production via acetone-butanol-ethanol (ABE) fermentation. Separated hydrolysis and fermentation (SHF), and pre-saccharification and simultaneous saccharification and fermentation (PSSF) were investigated at 10 and 15 % w/v biomass loading. For 15 % w/v, the synergistic effect of weak acids and phenolic compounds made the sugarcane straw hydrolysate poorly fermentable. The 10 % w/v solid load was more favorable (similar to 4-fold higher) in both SHF and PSSF strategies with respect to the ABE production, without including a detoxification step. However, PSSF achieved higher ABE titer (10.5 g/L - SHF; 13.5 g/L - PSSF) and productivity (0.09 g/(L.h) - SHF; 0.14 g/(L.h) - PSSF) when compared with SHF. Using best condition (PSSF at 10 % w/v), it would be possible to estimate a yield of 169 L ABE per ton pretreated sugarcane straw (or 84.5 L ABE per ton of raw sugarcane straw), containing 65 L acetone, 95 L butanol, and 9 L ethanol. This result represents a process efficiency of 28 %, based on carbohydrates content in raw material. (AU)

• Processo FAPESP: 16/10636-8 - Da fábrica celular à biorrefinaria integrada Biodiesel-Bioetanol: uma abordagem sistêmica aplicada a problemas complexos em micro e macroescalas
• Beneficiário: Roberto de Campos Giordano
• Modalidade de apoio: Auxílio à Pesquisa - Programa BIOEN - Temático