Effects of acids pre-treatment on the microbial fermentation process for bioethanol production from microalgae

Phwan, Chai Kee and Chew, Kit Wayne and Sebayang, Abdi Hanra and Ong, Hwai Chyuan and Ling, Tau Chuan and Malek, Marlinda Abdul and Ho, Yeek-Chia and Show, Pau Loke (2019) Effects of acids pre-treatment on the microbial fermentation process for bioethanol production from microalgae. Biotechnology for Biofuels, 12 (1). p. 191. ISSN 1754-6834, DOI https://doi.org/10.1186/s13068-019-1533-5.

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Official URL: https://doi.org/10.1186/s13068-019-1533-5


Background: Microalgae are one of the promising feedstock that consists of high carbohydrate content which can be converted into bioethanol. Pre-treatment is one of the critical steps required to release fermentable sugars to be used in the microbial fermentation process. In this study, the reducing sugar concentration of Chlorella species was investigated by pre-treating the biomass with dilute sulfuric acid and acetic acid at different concentrations 1%, 3%, 5%, 7%, and 9% (v/v). Results: 3,5-Dinitrosalicylic acid (DNS) method, FTIR, and GC-FID were employed to evaluate the reducing sugar concentration, functional groups of alcohol bonds and concentration of bioethanol, respectively. The two-way ANOVA results (p < 0.05) indicated that there was a significant difference in the concentration and type of acids towards bioethanol production. The highest bioethanol yield obtained was 0.28 g ethanol/g microalgae which was found in microalgae sample pre-treated with 5% (v/v) sulfuric acid while 0.23 g ethanol/g microalgal biomass was presented in microalgae sample pre-treated with 5% (v/v) acetic acid. Conclusion: The application of acid pre-treatment on microalgae for bioethanol production will contribute to higher effectiveness and lower energy consumption compared to other pre-treatment methods. The findings from this study are essential for the commercial production of bioethanol from microalgae. © 2019 The Author(s).

Item Type: Article
Funders: Fundamental Research Grant Scheme, Malaysia (FRGS/1/2015/SG05/UNIM/03/1), Overseas Researcher under Fel‑ lowship of Japan Society for the Promotion of Science (JSPS), iRMC Bold 2025, Universiti Tenaga Nasional, Malaysia (Grant Code: RJO 1043 6494)
Uncontrolled Keywords: Bioethanol; Fermentation; Microalgae; Pre-treatment; Reducing sugar concentration
Subjects: Q Science > Q Science (General)
Q Science > QR Microbiology
T Technology > TA Engineering (General). Civil engineering (General)
Divisions: Faculty of Engineering
Faculty of Science > Institute of Biological Sciences
Depositing User: Ms. Juhaida Abd Rahim
Date Deposited: 12 Feb 2020 01:31
Last Modified: 12 Feb 2020 01:31
URI: http://eprints.um.edu.my/id/eprint/23751

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