Quality Assessment of Biogas-Producing Macroalgae from Azov Sea and Šventoji River

Alvydas Zagorskis (), Akvilė Gotovskienė and Vladimir Monin
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Alvydas Zagorskis: Research Institute of Environmental Protection, Vilnius Gediminas Technical University, 10223 Vilnius, Lithuania
Akvilė Gotovskienė: Research Institute of Environmental Protection, Vilnius Gediminas Technical University, 10223 Vilnius, Lithuania
Vladimir Monin: Department of Primary Science Institute of Modern Technologies, Pryazovskyi State Technical University, 87555 Mariupol, Ukraine

Sustainability, 2023, vol. 15, issue 19, 1-17

Abstract: The decline of fossil fuels, the increase in greenhouse gases, and the global demand for energy are driving the search for alternative energy sources. Anaerobic digestion is a promising technology because it can convert organic biomass into biogas. As the climate warms, there is an increase in the biomass of plant origin in water bodies, and ecosystems are unable to clean themselves. The novelty of the work is that it determines the energetic values of macroalgae growing in the Sea of Azov and freshwater bodies using theoretical and experimental methods. This work aims to show that macroalgae and aquatic plants can be an excellent raw material for biogas production. By mixing them with co-substrates such as cattle manure, higher biogas and methane yields can be obtained. When Cladophora glomerata and Enteromorpha intestinalis macroalgae are mixed with cattle manure, the biogas yield is up to 458.8 mL/gVS and 397.9 mL/gVS, respectively. Methane concentration remained high and reached 62.4–64.1%. The obtained research results show the high energy value of biogas and the energy potential of biomass. Macroalgae increased the energy potential of biogas to 22.9 MJ/m 3 , and the energy potential of biomass reached 2.40 MJ/Kg. Due to its high energy value, biogas produced from the considered substrates can be an excellent alternative to fossil fuels. Integrating aquatic macroalgae into anaerobic digestion is a promising approach for a waste-free marine and freshwater system.

Keywords: biogas; cattle manure; energy potential; macroalgae; methane (search for similar items in EconPapers)
JEL-codes: O13 Q Q0 Q2 Q3 Q5 Q56 (search for similar items in EconPapers)
Date: 2023
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