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Energy and Fertilizer Recovery from Cavitated Cyanobacterial Slurries

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Abstract:

The escalating energy crisis and eutrophication of the Dnieper River cascade, worsened by military actions and the Kakhovka HPP dam destruction, demand a shift toward valorizing aquatic biomass. This study presents a full-cycle biotechnological approach to convert hyper-productive cyanobacteria, mainly Microcystis aeruginosa, from an environmental threat into a valuable resource. To overcome the structural resilience of cyanobacterial cell walls, we applied vibro-resonant cavitation (VRC) at 37–110 Hz. VRC outperforms acoustic and hydrodynamic methods in disintegration efficiency and continuous-flow scalability. Processed biomass produces high-purity biogas (75–80% methane) with a calorific value of 18–25 MJ/m³. The residual digestate serves as an effective organomineral fertilizer (NPK: 12.7%, 1.3%, 2.1%). Ecotoxicological tests with Daphnia magna show a 7.5–12.7 fold reduction in substrate toxicity due to microcystin degradation. With seasonal biomass accumulation of 4.14×10⁷ tons in Kremenchuk and Kam'yansk reservoirs, this approach could generate 18.84 million m³ of methane and 25 million tons of safe liquid fertilizers annually, supporting Ukraine’s post-war bio-based recovery.

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Periodical:

Advances in Science and Technology (Volume 174)

Pages:

55-64

DOI:

https://doi.org/10.4028/p-OfumI1

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Online since:

April 2026

Authors:

Volodymyr Nykyforov, Myroslav Malovanyy, Ivan Tymchuk, Oksana Kushnir, Petro Matviiv*, Maksym Karachun, Nazar Grytsenko

Keywords:

Anaerobic Digestion, Biomethane, Circular Bioeconomy, Dnieper River, Microcystin Detoxification, Microcystis Aeruginosa, Vibro-Resonant Cavitation

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© 2026 Trans Tech Publications Ltd. All Rights Reserved

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