Microalgae derived biomass and bioenergy production enhancement through biogas purification and wastewater treatment
2021
Miyawaki, B. | Mariano, A.B. | Vargas, J.V.C. | Balmant, W. | Defrancheschi, A.C. | Corrêa, D.O. | Santos, B. | Selesu, N.F.H. | Ordonez, J.C. | Kava, V.M.
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.
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