Production of biofuels from soybean straw and hull hydrolysates obtained by subcritical water hydrolysis. (May 2021)

• Record Type: Journal Article
• Authors: Vedovatto, Felipe; Bonatto, Charline; Bazoti, Suzana F.; Venturin, Bruno; Alves Jr., Sérgio L.; Kunz, Airton; Steinmetz, Ricardo L.R.; Treichel, Helen; Mazutti, Marcio A.; Zabot, Giovani L.; Tres, Marcus V.
• Is Part Of: Bioresource technology. Volume 328(2021)
• Publication Date: 2021-05
• Subjects: Bioethanol -- Biogas -- Hull -- Straw -- Subcritical fluid; Biomass -- Periodicals; Biomass energy -- Periodicals; Bioremediation -- Periodicals; Agricultural wastes -- Periodicals; Factory and trade waste -- Periodicals; Organic wastes -- Periodicals; Bioénergie -- Périodiques; Déchets agricoles -- Périodiques; Déchets industriels -- Périodiques; Déchets organiques -- Périodiques; Déchets (Combustible) -- Périodiques; 662.88
• DOI: 10.1016/j.biortech.2021.124837
• Languages: English
• ISSNs: 0960-8524

Abstract

Graphical abstract: Highlights: Subcritical water hydrolysis produced fermentable sugars at 220 °C. Ethanol was produced from soybean straw and hull hydrolysates. The yeast Wickerhamomyces sp. UFFS-CE-3.1.2 was used. The fermented hydrolysates of straw increased biogas production by more than 60%. Abstract: The objective of this study was to evaluate the ethanol production by Wickerhamomyces sp. using soybean straw and hull hydrolysates obtained by subcritical water hydrolysis and, afterward, the biogas production using the fermented hydrolysates. Ethanol was produced using the straw and hull hydrolysates diluted and supplement with glucose, reaching 5.57 ± 0.01 g/L and 6.11 ± 0.11 g/L, respectively. The fermentation in a bioreactor with changing the pH to 7.0 allowed achieving maximum ethanol production of 4.03 and 3.60 g/L for straw and hull hydrolysates at 24 h, respectively. The biogas productions obtained for the fermented hydrolysates of straw with and without changing the pH were 739 ± 37 and 652 ± 34 NmL/gVSad, respectively. The fermented hydrolysate of hull without changing the pH presented 620 ± 26 NmL/gVSad . The soybean residues produced biofuels, indicating these residues show potential as raw material for renewable energy production.