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

Yu, KL; Chen, WH; Sheen, HK; Chang, JS; Lin, CS; Ong, HC; Show, PL; Ling, TC

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

Yu, KL Chen, WH Sheen, HK Chang, JS Lin, CS Ong, HC Show, PL Ling, TC

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Publisher:: ELSEVIER SCI LTD
Publication Type:: Journal Article
Citation:: Fuel, 2020, 279
Issue Date:: 2020-11-01

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Field	Value	Language
dc.contributor.author	Yu, KL
dc.contributor.author	Chen, WH
dc.contributor.author	Sheen, HK
dc.contributor.author	Chang, JS
dc.contributor.author	Lin, CS
dc.contributor.author	Ong, HC
dc.contributor.author	Show, PL
dc.contributor.author	Ling, TC
dc.date.accessioned	2020-11-06T20:07:10Z
dc.date.available	2020-11-06T20:07:10Z
dc.date.issued	2020-11-01
dc.identifier.citation	Fuel, 2020, 279
dc.identifier.issn	0016-2361
dc.identifier.issn	1873-7153
dc.identifier.uri	http://hdl.handle.net/10453/143804
dc.description.abstract	© 2020 Elsevier Ltd 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.
dc.language	English
dc.publisher	ELSEVIER SCI LTD
dc.relation.ispartof	Fuel
dc.relation.isbasedon	10.1016/j.fuel.2020.118435
dc.rights	info:eu-repo/semantics/closedAccess
dc.subject	0306 Physical Chemistry (incl. Structural), 0904 Chemical Engineering, 0913 Mechanical Engineering
dc.subject.classification	Energy
dc.title	Bioethanol production from acid pretreated microalgal hydrolysate using microwave-assisted heating wet torrefaction
dc.type	Journal Article
utslib.citation.volume	279
utslib.for	0306 Physical Chemistry (incl. Structural)
utslib.for	0904 Chemical Engineering
utslib.for	0913 Mechanical Engineering
pubs.organisational-group	/University of Technology Sydney/Faculty of Engineering and Information Technology
pubs.organisational-group	/University of Technology Sydney/Faculty of Engineering and Information Technology/School of Information, Systems and Modelling
pubs.organisational-group	/University of Technology Sydney
utslib.copyright.status	closed_access	*
dc.date.updated	2020-11-06T20:07:06Z
pubs.publication-status	Accepted
pubs.volume	279

Abstract:

© 2020 Elsevier Ltd 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.

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