Fractionation of sugarcane bagasse using hydrothermal and advanced oxidative pretreatments for bioethanol and biogas production in lignocellulose biorefineries

[Display omitted] •The proposed SB fractionation strategy led to substantial savings of H2O2.•Alkaline extraction after hydrothermal pretreatment led to high delignification.•The higher accessibility of pretreated SB led to an enzymatic conversion of 88.9%.•190.8 Lethanol tonSB−1 were produced by fe...

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Bibliographic Details
Published in:Bioresource technology 2019-11, Vol.292, p.121963-121963, Article 121963
Main Authors: Bittencourt, Gustavo Amaro, Barreto, Elisa da Silva, Brandão, Rogélio Lopes, Baêta, Bruno Eduardo Lobo, Gurgel, Leandro Vinícius Alves
Format: Article
Language:English
Subjects:
Advanced oxidative pretreatment
Biogas
Fermentation
Fractionation
Second-generation ethanol
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Summary:[Display omitted] •The proposed SB fractionation strategy led to substantial savings of H2O2.•Alkaline extraction after hydrothermal pretreatment led to high delignification.•The higher accessibility of pretreated SB led to an enzymatic conversion of 88.9%.•190.8 Lethanol tonSB−1 were produced by fermentation using S. cerevisiae LBCM1047.•The anaerobic digestion of residual liquid streams produced 27.46 Nm3CH4 tonSB−1. The fractionation of sugarcane bagasse (SB) by hydrothermal pretreatment (HP, autohydrolysis) followed by alkaline extraction (AE) and advanced oxidative pretreatment (AOP) for production of second-generation ethanol and biogas was investigated. The AOP of SB was optimized using a Doehlert design, varying the applied H2O2 load, liquid-to-solid ratio (LSR), and time. The responses evaluated were yield (Y), residual cellulose (RC), delignification (DE), and enzymatic conversion (EC). The AE of SB pretreated by HP led to 61.8% DE (using 0.2 mol L−1 NaOH). This high lignin removal enabled substantial savings of H2O2 in the AOP. The optimized AOP conditions led to 78% Y, 82.2% RC, 42.7% DE, and 88.9% EC (overall glucose yield of 60.9%). Fermentation of the enzymatic hydrolysate with Saccharomyces cerevisiae yielded 190.8 Lethanol tonSB−1. Biogas production by anaerobic digestion of residual liquid streams of the pretreatment steps yielded 27.46 NLCH4 kgSB−1. An energy balance was estimated for the SB fractionation.
ISSN:0960-8524
1873-2976
DOI:10.1016/j.biortech.2019.121963