Microalgae derived biomass and bioenergy production enhancement through biogas purification and wastewater treatment

B. Miyawaki, A.B. Mariano, J.V.C. Vargas, W. Balmant, A.C. Defrancheschi, D.O. Corrêa, B. Santos, N.F.H. Selesu, J.C. Ordonez and V.M. Kava

Renewable Energy, 2021, vol. 163, issue C, 1153-1165

Abstract: Microalgae were grown in 12-L airlift photobioreactors (PBR) containing biodigested swine manure (BSM), cattle manure (BCM) and domestic sewage (BDS), with 5% v/v, 25% v/v and 30% v/v respectively and compared with synthetic medium CHU. BSM with biogas/air mixture (10% CO2) injection on the 8th day led to of 13,257 ± 430 × 104 cell mL−1, and 2.0 ± 0.16 g L−1 dry biomass with a 26% lipid content, which was approximately 70% higher than with air. After microalgae purification, biogas at the PBR outlet averaged 91% v/v CH4. In terms of bioenergy: i) the biogas lower heating value (LHV) increased from 22,554 to 33,294 kJ m−3 (47.6%) with BSM, and similarly with BCM and BDS; ii) lipid content was increased, and iii) biohydrogen production is expected to increase from the PBR. For wastewater bioremediation, the microalgae Tetradesmus obliquus were able to remove 99.3% of ammonia and 99.2% of phosphorus concentration from BSM. There was a 96% BOD (628 mg L−1 to 23.3 mg L−1) and 91% COD reduction (1262 mg L−1 to 132 mg L−1). There was a 70% increase in biomass production and up to 4-fold lipid content increase with the procedure in comparison to air injection.

Keywords: Tetradesmus obliquus; Biofuels; Sustainable energy; Wastewater; Bioremediation; Air transport (search for similar items in EconPapers)
Date: 2021
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Citations: View citations in EconPapers (2)

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Persistent link: https://EconPapers.repec.org/RePEc:eee:renene:v:163:y:2021:i:c:p:1153-1165

DOI: 10.1016/j.renene.2020.09.045

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