20.500.12556/RUL-151587 The use of hydrodynamic cavitation for waste-to-energy approach to enhance methane production from waste activated sludge Anaerobic digestion in wastewater treatment plants converts its unwanted end product – waste activated sludge into biogas. Even if the process is well established, pre-treatment of the sludge can further improve its efficiency. In this study, four treatment regimes for increasing methane production through prior sludge disintegration were investigated using lab-scale cavitation generator and real sludge samples. Three different cavitating (attached cavitation regime, developed cloud shedding cavitation regime and cavitation in a wake regime) and one non-cavitating regime at elevated static pressure were studied in detail for their effectiveness on physical and chemical properties of sludge samples. Volume-weighted mean diameter D[4,3] of sludge's particles decreased by up to 92%, specific surface area increased by up to 611%, while viscosity (at a shear rate of 3.0 s$^{−1}$) increased by up to 39% in the non-cavitating and decreased by up to 24% in all three cavitating regimes. Chemical changes were more pronounced in cavitating regimes, where released soluble chemical oxygen demand (sCOD) and increase of dissolved organic matter (DOM) compounds by up to 175% and 122% were achieved, respectively. Methane production increased in all four cases, with the highest increase of 70% corresponding to 312 mL CH$_4$ g$^{−1}$ COD. However, this treatment was not particularly efficient in terms of energy consumption. The best energy balance was found for the regime with a biochemical methane potential increase of 43%. hydrodynamic cavitation waste activated sludge disintegration viscosity methane production energy balance hidrodinamska kavitacija aktivno odpadno blato dezintegracija viskoznost proizvodnja metana energijska bilanca true false true Angleški jezik Slovenski jezik Članek v reviji 2023-10-11 08:57:24 2023-10-11 08:57:25 2024-02-13 11:40:38 0000-00-00 00:00:00 2023 0 0 11 str. Vol. 347, art. 119074 Dec. 2023 0000-00-00 Zaloznikova Objavljeno NiDoloceno 0000-00-00 0000-00-00 0000-00-00 532.528 0301-4797 10.1016/j.jenvman.2023.119074 167876867 Zupanc...The_use_of_hydrodynamic_cavitation_for_waste-to-energy_approach_to_enhance_methane_production_from_waste_activated_sludge.pdf Zupanc...The_use_of_hydrodynamic_cavitation_for_waste-to-energy_approach_to_enhance_methane_production_from_waste_activated_sludge.pdf 1 8142C28FD3BD363A8E1B57B1385B0225 b54ff2317fe88e67214dfc8fdedd26460c35e578165fca4daa19b3ab6bad79bb c599843a-6804-11ee-9b9b-0050569b8976 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=176585 https://www.sciencedirect.com/science/article/pii/S0301479723018625 1 70140d10-6803-11ee-9b9b-0050569b8976 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=176584 Fakulteta za strojništvo Fakulteta za gradbeništvo in geodezijo 0 0 0