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Investigation into cavitational intensity and COD reduction performance of the pinned disc reactor with various rotor-stator arrangements
ID Gostiša, Jurij (Author), ID Zupanc, Mojca (Author), ID Dular, Matevž (Author), ID Širok, Brane (Author), ID Levstek, Meta (Author), ID 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
Typology:1.01 - Original Scientific Article
Organization:FS - Faculty of Mechanical Engineering
Publication status:Published
Publication version:Version of Record
Year:2021
Number of pages:11 str.
Numbering:Vol. 77, art. 105669
PID:20.500.12556/RUL-128668 This link opens in a new window
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
Publication date in RUL:22.07.2021
Views:728
Downloads:197
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Record is a part of a journal

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

Licences

License:CC BY-NC-ND 4.0, Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International
Link:http://creativecommons.org/licenses/by-nc-nd/4.0/
Description:The most restrictive Creative Commons license. This only allows people to download and share the work for no commercial gain and for no other purposes.

Secondary language

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

Projects

Funder:ARRS - Agencija za raziskovalno dejavnost Republike Slovenije
Project number:P2-0401
Name:Energetsko strojništvo

Funder:Drugi - Drug financer ali več financerjev
Funding programme:University of Ljubljana, UL Innovation Fund
Project number:820-1/2020-35

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