Preliminary analysis - effect of a rotary generator of hydrodynamic cavitation on rheology and methane yield of wastewater sludge

Blagojevič, Marko (avtor), Bizjan, Benjamin (avtor), Zupanc, Mojca (avtor), Gostiša, Jurij (avtor), Slemenik Perše, Lidija (avtor), Gradišar Centa, Urška (avtor), Stres, Blaž (avtor), Novak, Uroš (avtor), Likozar, Blaž (avtor), Rak, Gašper (avtor), Kolbl Repinc, Sabina (avtor)

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.

• Jezik: Angleški jezik
• Ključne besede: waste sludge, hydrodynamic cavitation, pinned disc, rheology, surface tension, dewaterability, methane
• Vrsta gradiva: Članek v reviji
• Tipologija: 1.01 - Izvirni znanstveni članek
• Organizacija: FS - Fakulteta za strojništvo ; BF - Biotehniška fakulteta ; FGG - Fakulteta za gradbeništvo in geodezijo
• Status publikacije: Objavljeno
• Različica publikacije: Objavljena publikacija
• Leto izida: 2024
• Št. strani: 12 str.
• Številčenje: Vol. 107
• PID: 20.500.12556/RUL-168270
• UDK: 628.3
• ISSN pri članku: 1350-4177
• DOI: 10.1016/j.ultsonch.2024.106943
• COBISS.SI-ID: 198974723
• Datum objave v RUL: 07.04.2025

Gradivo je del revije

• Naslov: Ultrasonics sonochemistry
• Skrajšan naslov: Ultrason. sonochem.
• Založnik: Butterworth-Heinemann, Elsevier
• ISSN: 1350-4177
• COBISS.SI-ID: 707668

Licence

• Licenca: CC BY-NC 4.0, Creative Commons Priznanje avtorstva-Nekomercialno 4.0 Mednarodna
• Povezava: http://creativecommons.org/licenses/by-nc/4.0/deed.sl
• Opis: Licenca Creative Commons, ki prepoveduje komercialno uporabo, vendar uporabniki ne rabijo upravljati materialnih avtorskih pravic na izpeljanih delih z enako licenco.