Third generation bioethanol from invasive macroalgae Sargassum muticum using autohydrolysis pretreatment as first step of a biorefinery

RENEWABLE ENERGY

卷:141

Article

del Rio, Pablo G.¹  Dominguez, Elena¹  Dominguez, Viana D.¹  Romani, Aloia²  Domingues, Lucilia²  Garrote, Gil¹ 

[1] Univ Vigo, Fac Sci, Dept Chem Engn, Campus Ourense, As Lagoas 32004, Ourense, Spain

[2] Univ Minho, CEB Ctr Biol Engn, Campus Gualtar, P-4710057 Braga, Portugal

关键词: Sargassum muticum;    Invasive seaweed;    Autohydrolysis;    Enzymatic hydrolysis;    Simultaneous saccharification and fermentation;    Industrial strains;   

DOI  :  10.1016/j.renene.2019.03.083

来源: Elsevier

【 摘 要 】

Sargassum muticum, an invasive macroalgae in Europe, was employed as material for third generation bioethanol production. As a first step, autohydrolysis was chosen as an eco-friendly pretreatment, seeking for a high enzymatic susceptibility of the solid phase and high content of hexoses as glucose, galactose and mannose, in both liquid and solid phases, which can be subsequently transformed in ethanol via fermentation. Besides, the search of a minimum consumption of energy in the pretreatment is also a key challenge in bioethanol production. At optimum conditions of autohydrolysis pretreatment, more than 90% of the glucan was recovered in the solid phase (while the other 10% appeared as glucooligosaccharides and glucose in the liquid phase). In the enzymatic hydrolysis carried out with the solid phases, glucan to glucose conversions of 94 and 89% were obtained, with the solid mixed with water and the whole slurry, respectively. Moreover, the whole slurry experiments, where all hexoses present in the raw material (glucose, galactose and mannose) from the solid and the liquid phases are fermented, allows to reach maximum ethanol yields of 80% (14.10 g of ethanol/L) referred to the theoretical yield, in a short time. (C) 2019 Elsevier Ltd. All rights reserved.

【 授权许可】

Free