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Microorganisms
Volume 12
Issue 1
10.3390/microorganisms12010109
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Article

Changes in Microbiota Composition during the Anaerobic Digestion of Macroalgae in a Three-Stage Bioreactor

by
Dovilė Vasiliauskienė
1,2,
Mantas Pranskevičius
2,
Regimantas Dauknys
3,
Jaunius Urbonavičius
1,2,
Juliana Lukša
1,4,
Vadym Burko
5 and
Alvydas Zagorskis
2,3,*
1
Department of Chemistry and Bioengineering, Vilnius Gediminas Technical University, Sauletekio av. 11, 10223 Vilnius, Lithuania
2
Institute of Environmental Protection, Vilnius Gediminas Technical University, 10223 Vilnius, Lithuania
3
Department of Environmental Protection and Water Engineering, Vilnius Gediminas Technical University, 10223 Vilnius, Lithuania
4
Laboratory of Genetics, Nature Research Centre, 08412 Vilnius, Lithuania
5
Department of Primary Science Institute of Modern Technologies, Pryazovskyi State Technical University, 87555 Mariupol, Ukraine
*
Author to whom correspondence should be addressed.
Microorganisms 2024, 12(1), 109; https://doi.org/10.3390/microorganisms12010109
Submission received: 1 December 2023 / Revised: 28 December 2023 / Accepted: 3 January 2024 / Published: 5 January 2024
(This article belongs to the Special Issue Microbial Biotechnology for a Circular Bioeconomy: From Nature's Toolbox to Industrial Innovation)
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Abstract

The use of microalgae as a raw material for biogas production is promising. Macroalgae were mixed with cattle manure, wheat straw, and an inoculant from sewage sludge. Mixing macroalgae with co-substrates increased biogas and methane yield. The research was carried out using a three-stage bioreactor. During biogas production, the dynamics of the composition of the microbiota in the anaerobic chamber of the bioreactor was evaluated. The microbiota composition at different organic load rates (OLRs) of the bioreactor was evaluated. This study also demonstrated that in a three-stage bioreactor, a higher yield of methane in biogas was obtained compared to a single-stage bioreactor. It was found that the most active functional pathway of methane biosynthesis is PWY-6969, which proceeds via the TCA cycle V (2-oxoglutarate synthase). Microbiota composition and methane yield depended on added volatile solids (VSadded). During the research, it was found that after reducing the ORL from 2.44 to 1.09 kg VS/d, the methane yield increased from 175.2 L CH4/kg VSadded to 323.5 L CH4/kg VSadded.
Keywords: biogas; methane; macroalgae; three-stage bioreactor; microbiota biogas; methane; macroalgae; three-stage bioreactor; microbiota

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MDPI and ACS Style

Vasiliauskienė, D.; Pranskevičius, M.; Dauknys, R.; Urbonavičius, J.; Lukša, J.; Burko, V.; Zagorskis, A. Changes in Microbiota Composition during the Anaerobic Digestion of Macroalgae in a Three-Stage Bioreactor. Microorganisms 2024, 12, 109. https://doi.org/10.3390/microorganisms12010109

AMA Style

Vasiliauskienė D, Pranskevičius M, Dauknys R, Urbonavičius J, Lukša J, Burko V, Zagorskis A. Changes in Microbiota Composition during the Anaerobic Digestion of Macroalgae in a Three-Stage Bioreactor. Microorganisms. 2024; 12(1):109. https://doi.org/10.3390/microorganisms12010109

Chicago/Turabian Style

Vasiliauskienė, Dovilė, Mantas Pranskevičius, Regimantas Dauknys, Jaunius Urbonavičius, Juliana Lukša, Vadym Burko, and Alvydas Zagorskis. 2024. "Changes in Microbiota Composition during the Anaerobic Digestion of Macroalgae in a Three-Stage Bioreactor" Microorganisms 12, no. 1: 109. https://doi.org/10.3390/microorganisms12010109

APA Style

Vasiliauskienė, D., Pranskevičius, M., Dauknys, R., Urbonavičius, J., Lukša, J., Burko, V., & Zagorskis, A. (2024). Changes in Microbiota Composition during the Anaerobic Digestion of Macroalgae in a Three-Stage Bioreactor. Microorganisms, 12(1), 109. https://doi.org/10.3390/microorganisms12010109

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