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

Yu, Kai Ling and Chen, Wei Hsin and Sheen, Herng Kuang and Chang, Jo Shu and Lin, Chih Sheng and Ong, Hwai Chyuan and Show, Pau Loke and Ling, Tau Chuan (2020) Bioethanol production from acid pretreated microalgal hydrolysate using microwave-assisted heating wet torrefaction. Fuel, 279. p. 118435. ISSN 0016-2361, DOI

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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. © 2020 Elsevier Ltd

Item Type: Article
Funders: University of Malaya , Malaysia under the SATU Joint Research Scheme with the grant number of ST023-2019 and partnership grant with National Cheng Kung University (NCKU), Taiwan, under the grant number of RK002-2019, Higher Education Sprout Project, Ministry of Education to the Headquarters of University Advancement , Taiwan at NCKU, Ministry of Science and Technology, Taiwan , R.O.C., under grant numbers of MOST 106-2923-E-006-002-MY3 and MOST 109-3116-F-006-016-CC1
Uncontrolled Keywords: Bioethanol and biochar; Wet torrefaction; Microalgae; Hydrolysate; Acid hydrolysis; Alternative fuel
Subjects: Q Science > Q Science (General)
Q Science > QH Natural history
Divisions: Faculty of Science > Institute of Biological Sciences
Depositing User: Ms. Juhaida Abd Rahim
Date Deposited: 10 Feb 2021 00:58
Last Modified: 10 Feb 2021 00:58

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