20.500.12556/RUL-168270 Preliminary analysis - effect of a rotary generator of hydrodynamic cavitation on rheology and methane yield of wastewater sludge Slightly acidic (pH 5.1) waste sludge with 4.7 % Total Solids (TS) was treated on a laboratory scale pined disc rotary generator of hydrodynamic cavitation (PD RGHC). Influence of four rotor discs with different number of cavitation generation units (CGUs) was investigated: 8-pins, 12-pins, 16-pins and 8-prism elements. The effect of hydrodynamic cavitation (HC) was investigated by analyzing rheological properties, surface tension, dewaterability, and particle size distribution. After subjecting the sludge to 30 cavitation passes, the dewatering ability of the sludge significantly decreased, resulting in a more than two-fold increase in Capillary Suction Time (CST). All regimes were successful in disintegrating particles to smaller sizes. A slight increase of sludge surface tension was measured post cavitation. Cavitated samples displayed a zero-shear viscosity, in contrast to the untreated sample, where viscosity noticeably increased as shear stress decreased. HC did not improve methane yield. Statistically significant correlations between physio-chemical properties and apparent viscosity at low shear stress were identified. Although there were no discernible statistical differences in sludge characteristics, some trends are visible among investigated CGU designs and warrant further research. waste sludge hydrodynamic cavitation pinned disc rheology surface tension dewaterability methane true false true Angleški jezik Ni določen Članek v reviji 2025-04-07 12:40:30 2025-04-07 12:40:34 2025-04-08 04:02:34 0000-00-00 00:00:00 2024 0 0 12 str. Vol. 107 jul. 2024 0000-00-00 Zaloznikova Objavljeno NiDoloceno 0000-00-00 0000-00-00 0000-00-00 628.3 1350-4177 10.1016/j.ultsonch.2024.106943 198974723 Blagojevic,_Bizjan_..._Preliminarypdf.pdf Blagojevic,_Bizjan_..._Preliminarypdf.pdf 1 D963C10F1937B4037D327AD388AFCB46 9f64e36f2ac8c5c01319ceb6d95970cfc65c4c765923ac7a188b20bc36018358 4725bf27-139c-11f0-b232-0050569b8976 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=201418 https://doi.org/10.1016/j.ultsonch.2024.106943 1 ad0e2669-139b-11f0-b232-0050569b8976 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=201416 Fakulteta za strojništvo Biotehniška fakulteta Fakulteta za gradbeništvo in geodezijo 0 0 0