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Investigation into cavitational intensity and COD reduction performance of the pinned disc reactor with various rotor-stator arrangements
Gostiša, Jurij (Author), Zupanc, Mojca (Author), Dular, Matevž (Author), Širok, Brane (Author), Levstek, Meta (Author), Bizjan, Benjamin (Author)

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Abstract
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.

Language:English
Keywords:hydrodynamic cavitation, wastewater treatment, pinned disc reactors, flow visualization, performance evaluation
Work type:Article (dk_c)
Tipology:1.01 - Original Scientific Article
Organization:FS - Faculty of Mechanical Engineering
Year:2021
Number of pages:Str. 1-11
Numbering:Vol. 77
UDC:532.528
ISSN on article:1350-4177
DOI:10.1016/j.ultsonch.2021.105669 This link opens in a new window
COBISS.SI-ID:70807811 This link opens in a new window
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Downloads:39
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Record is a part of a journal

Title:Ultrasonics Sonochemistry
Shortened title:Ultrason. sonochem.
Publisher:Butterworth-Heinemann, Elsevier Science
ISSN:1350-4177
COBISS.SI-ID:707668 This link opens in a new window

Document is financed by a project

Funder:ARRS - Agencija za raziskovalno dejavnost Republike Slovenije (ARRS)
Project no.:P2-0401
Name:Energetsko strojništvo

Funder:Drugi - Drug financer ali več financerjev
Funding Programme:UL inovacijski sklad
Project no.:820-1/2020-35

Secondary language

Language:Slovenian
Keywords:hidrodinamska kavitacija, odpadne vode, kavitacijski reaktorji, turbostroji, vizualizacija, učinkovitost razgradnje KPK

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