Investigation into cavitational intensity and COD reduction performance of the pinned disc reactor with various rotor-stator arrangements

Gostiša, Jurij (avtor), Zupanc, Mojca (avtor), Dular, Matevž (avtor), Širok, Brane (avtor), Levstek, Meta (avtor), Bizjan, Benjamin (avtor)

In this study, the hydrodynamic cavitation and wastewater treatment performance of a rotary generator with pin disk for hydrodynamic cavitation are investigated. Various geometrical features and arrangements of rotor and stator pins were evaluated to improve the configuration of the cavitation device. The pilot device used to perform the experiments was upgraded with a transparent cover that allows visualization of the hydrodynamic cavitation in the rotor-stator region with high-speed camera and simultaneous measurement of pressure fluctuations. Based on the hydrodynamic characteristics, three arrangements were selected and evaluated with respect to the chemical effects of cavitation on a 200-liter wastewater influent sample. The experimental results show that the rotational speed and the spacing of the rotor pins have the most significant effect on the cavitation intensity and effectiveness, while the pin diameter and the surface roughness are less significant design parameters. Cavitation intensity increases with pin velocity, but can be inhibited if the pins are arranged too close together. At best configuration, COD was reduced by 31% in 15 liquid passes, consuming 8.2 kWh/kg COD. The number of liquid passes also proved to be an important process parameter for improving the energy efficiency.

• Jezik: Angleški jezik
• Ključne besede: hydrodynamic cavitation, wastewater treatment, pinned disc reactors, flow visualization, performance evaluation
• Vrsta gradiva: Članek v reviji
• Tipologija: 1.01 - Izvirni znanstveni članek
• Organizacija: FS - Fakulteta za strojništvo
• Status publikacije: Objavljeno
• Različica publikacije: Objavljena publikacija
• Leto izida: 2021
• Št. strani: 11 str.
• Številčenje: Vol. 77, art. 105669
• PID: 20.500.12556/RUL-128668
• UDK: 532.528
• ISSN pri članku: 1350-4177
• DOI: 10.1016/j.ultsonch.2021.105669
• COBISS.SI-ID: 70807811
• Datum objave v RUL: 22.07.2021

Gradivo je del revije

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

Licence

• Licenca: CC BY-NC-ND 4.0, Creative Commons Priznanje avtorstva-Nekomercialno-Brez predelav 4.0 Mednarodna
• Povezava: http://creativecommons.org/licenses/by-nc-nd/4.0/deed.sl
• Opis: Najbolj omejujoča licenca Creative Commons. Uporabniki lahko prenesejo in delijo delo v nekomercialne namene in ga ne smejo uporabiti za nobene druge namene.

Sekundarni jezik

• Jezik: Slovenski jezik
• Ključne besede: hidrodinamska kavitacija, odpadne vode, kavitacijski reaktorji, turbostroji, vizualizacija, kemijska potreba po kisiku, KPK, učinkovitost razgradnje KPK

Projekti

• Financer: ARRS - Agencija za raziskovalno dejavnost Republike Slovenije
• Številka projekta: P2-0401
• Naslov: Energetsko strojništvo

• Financer: Drugi - Drug financer ali več financerjev
• Program financ.: University of Ljubljana, UL Innovation Fund
• Številka projekta: 820-1/2020-35