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Energies 2019, 12(3), 526;

Application of Hydrodynamic Cavitation for Improving Methane Fermentation of Sida hermaphrodita Silage

University of Warmia and Mazury in Olsztyn, Department of Environment Engineering, Warszawska 117, 10-720 Olsztyn, Poland
Czestochowa University of Technology, J.H. Dąbrowskiego 69, 42-201 Częstochowa, Poland
Author to whom correspondence should be addressed.
Received: 3 January 2019 / Revised: 31 January 2019 / Accepted: 3 February 2019 / Published: 7 February 2019
(This article belongs to the Section Sustainable Energy)
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Hydrodynamic cavitation was recently applied as a biomass pretreatment method. Most of the studies which used hydrodynamic cavitation were applied to pretreated sugarcane bagasse or reed. High biomass yield of Sida hermaphrodita points out the necessity of studies on its effective pretreatment before methane fermentation, especially because its “wood-like” characteristics could present different disintegration properties than other lignocellulose biomass. Thus, the aim of the study was to investigate the influence of duration of hydrodynamic cavitation on lignocellulose composition in Sida hermaphrodita silage, and the assessment of disintegrated biomass as a substrate for methane fermentation. The study showed a slight decrease in lignin, cellulose, and hemicellulose content in biomass after hydrodynamic cavitation, which resulted in a higher content of carbohydrates in the liquid fraction of disintegrated substrates. Methane production was 439.1 ± 45.0 L CH4/kg total solids (TS) from the substrate disintegrated for 20 min. However, the most effective time for methane production was hydrodynamic cavitation of the substrate for 5 min. At this pretreatment duration, the highest values for chemical oxygen demand (COD), total organic carbon (TOC), and carbohydrate reduction were also noted. The study proved that hydrodynamic cavitation applied for 5 min allowed obtaining an energy profit of 0.17 Wh/g TS. The studies on a laboratory scale indicated that the technology of hydrodynamic cavitation of Sida hermaphrodita could be economically applied for methane fermentation on a large scale. View Full-Text
Keywords: Virginia mallow; Virginia fanpetals; hydrodynamic cavitation; biogas production Virginia mallow; Virginia fanpetals; hydrodynamic cavitation; biogas production

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Zieliński, M.; Rusanowska, P.; Krzywik, A.; Dudek, M.; Nowicka, A.; Dębowski, M. Application of Hydrodynamic Cavitation for Improving Methane Fermentation of Sida hermaphrodita Silage. Energies 2019, 12, 526.

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