Bioethanol production from Chlorella vulgaris ESP-31 grown in unsterilized swine wastewater

[Display omitted] •Chlorella microalgal strains were cultivated in diluted swine wastewater (SW)•Algal carbohydrate content was higher in 25% (v/v) SW and 25% (w/v) BG-11.•Light intensity affected biomass and carbohydrate accumulation trends.•Inoculum size did not influence biomass and carbohydrate...

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Bibliographic Details
Published in:Bioresource technology 2022-05, Vol.352, p.127086-127086, Article 127086
Main Authors: Acebu, Paula Isabel G., de Luna, Mark Daniel G., Chen, Chun-Yen, Abarca, Ralf Ruffel M., Chen, Jih-Heng, Chang, Jo-Shu
Format: Article
Language:English
Subjects:
Bioethanol production
Carbohydrate accumulation
Microalgae
Total nitrogen removal
Wastewater treatment
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Summary:[Display omitted] •Chlorella microalgal strains were cultivated in diluted swine wastewater (SW)•Algal carbohydrate content was higher in 25% (v/v) SW and 25% (w/v) BG-11.•Light intensity affected biomass and carbohydrate accumulation trends.•Inoculum size did not influence biomass and carbohydrate accumulation.•Chlorella vulgaris biomass grown in SW was successfully converted to bioethanol. The potential of microalgae to remove nutrients from swine wastewater and accumulate carbohydrates was examined. Chlorella sorokiniana AK-1 and Chlorella vulgaris ESP-31 were grown in 10% unsterilized swine wastewater and obtained a maximum carbohydrate content and productivity of 42.5% and 189 mg L−1d−1, respectively. At 25% wastewater and 25% BG-11 concentration, the maximum carbohydrate productivity and total nitrogen removal efficiency of C. vulgaris ESP-31 were improved to 266 mg L−1d−1 and 54.2%, respectively. Further modifications in light intensity, inoculum size, and harvesting period enhanced the biomass growth, carbohydrate concentration, and total nitrogen assimilation to 3.6 gL−1, 1.8 gL−1, and 92.2%, respectively. Ethanol fermentation of the biomass resulted in bioethanol yield and concentration of 84.2% and 4.2 gL−1, respectively. Overall, unsterilized swine wastewater was demonstrated as a cost-effective nutrient source for microalgal cultivation which further increases the economic feasibility and environmental compatibility of bioethanol production with concomitant swine wastewater treatment.
ISSN:0960-8524
1873-2976
DOI:10.1016/j.biortech.2022.127086