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Bioethanol production from acid pretreated microalgal hydrolysate using microwave-assisted heating wet torrefaction

[Display omitted] •Feasible bioethanol production from acid pretreated microalgal hydrolysate using wet torrefaction.•Carbohydrate-rich microalga C. vulgaris ESP-31 showed better performance in bioethanol production.•Reducing sugar by-product 5-HMF act as the fermentation inhibitor in bioethanol pro...

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Bibliographic Details
Published in:Fuel (Guildford) 2020-11, Vol.279, p.118435, Article 118435
Main Authors: Yu, Kai Ling, Chen, Wei-Hsin, Sheen, Herng-Kuang, Chang, Jo-Shu, Lin, Chih-Sheng, Ong, Hwai Chyuan, Show, Pau Loke, Ling, Tau Chuan
Format: Article
Language:English
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Summary:[Display omitted] •Feasible bioethanol production from acid pretreated microalgal hydrolysate using wet torrefaction.•Carbohydrate-rich microalga C. vulgaris ESP-31 showed better performance in bioethanol production.•Reducing sugar by-product 5-HMF act as the fermentation inhibitor in bioethanol production.•The highest ethanol yield achieved was 0.0761 g ethanol/ (g microalgae). This study focused on the bioethanol production from the co-production of solid biochar and liquid hydrolysate under microwave-assisted heating wet torrefaction towards a sustainable green technology. The two indigenous microalgal biomass undergone dilute acid pretreatment using wet torrefaction to produce microalgal hydrolysates and biochar at operating conditions of 160–170 °C with holding times of 5–10 min. The hydrolysates were utilized for fermentation with the yeast Saccharomyces cerevisiae at 29 °C in a dark condition at a non-agitation state for 120 h. The concentrations of total reducing sugar, reducing sugar by-product, and bioethanol in the hydrolysates were determined. The carbohydrate-rich microalga C. vulgaris ESP-31 showed a good performance in bioethanol production. Microalgal hydrolysate obtained after the pretreatment consisted of a total reducing sugar with the highest concentration of 98.11 g/L. The formation of by-product 5-hydroxymethyl-2-furaldehyde (5-HMF), which might act as the fermentation inhibitor that led to the low ethanol yield, was also analyzed. The highest ethanol yield achieved was 7.61% with a maximum experimental conversion probability of 95.22%. This study has demonstrated the feasible bioethanol production from microalgal hydrolysate through microwave-assisted heating wet torrefaction using dilute acids and the optimization of bioethanol production can be carried out for better performance in the future study.
ISSN:0016-2361
1873-7153
DOI:10.1016/j.fuel.2020.118435