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

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.

Keywords

hydrodynamic cavitation;wastewater treatment;pinned disc reactors;flow visualization;performance evaluation;

Data

Language: English
Year of publishing:
Typology: 1.01 - Original Scientific Article
Organization: UL FS - Faculty of Mechanical Engineering
UDC: 532.528
COBISS: 70807811 Link will open in a new window
ISSN: 1350-4177
Views: 446
Downloads: 159
Average score: 0 (0 votes)
Metadata: JSON JSON-RDF JSON-LD TURTLE N-TRIPLES XML RDFA MICRODATA DC-XML DC-RDF RDF

Other data

Secondary language: Slovenian
Secondary keywords: hidrodinamska kavitacija;odpadne vode;kavitacijski reaktorji;turbostroji;vizualizacija;učinkovitost razgradnje KPK;
Type (COBISS): Article
Pages: str. 1-11
Issue: ǂVol. ǂ77
Chronology: Sept. 2021
DOI: 10.1016/j.ultsonch.2021.105669
ID: 13163783