Journal
BIORESOURCE TECHNOLOGY
Volume 292, Issue -, Pages -Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.biortech.2019.121963
Keywords
Fractionation; Advanced oxidative pretreatment; Second-generation ethanol; Fermentation; Biogas
Funding
- Universidade Federal de Ouro Preto (UFOP)
- Fundacao de Amparo a Pesquisa do Estado de Minas Gerais (FAPEMIG) [CEX-APQ-01376-18]
- Conselho Nacional de Desenvolvimento Cientifico e Tecnologico (CNPq) [482126/2013-2]
- CNPq [305099/2016-7]
- Coordenacao de Aperfeicoamento de Pessoal de Nivel Superior - Brasil (CAPES) [001]
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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 L-ethanol ton(S)(B)(-1). Biogas production by anaerobic digestion of residual liquid streams of the pretreatment steps yielded 27.46 NLCH4 kgs(SB)(-1). An energy balance was estimated for the SB fractionation.
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