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An Application of Orifice Hydrodynamic Cavitation Reactor for Tertiary Treatment of Wastewater Treatment Plant Effluents

Szaja Aleksandra, Montusiewicz Agnieszka, Lebiocka Magdalena, Skrzypiec Jan

Advances in Science and Technology. Research Journal

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2023

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Vol. 17, no 6

98--107

EN

In this paper, a multi-orifice hydrodynamic cavitator (HC) has been applied as an effective device for water reclamation. Municipal wastewater after mechanical and biological treatment has been applied as a medium. The effectiveness of using this device has been evaluated on the basis on the microbiological indicators. Moreover, optimization of operating parameters was evaluated. Two experiments with different inlet pressure of 0.4 and 0.6 MPa were performed. The samples for analyses were taken at the following time intervals: 0, 15, 30, 60 and 90 min. The application of HC reactor provided the effective destruction of microorganisms, thus allowing for subsequent use of reclaimed water. With regard to Escherichia coli and Coliform bacteria destruction, the longest time of 90 min and higher pressure of 0.6 MPa might be considered as the most advantageous conditions to perform cavitation. In both cases, the microbes were deactivated in over 50%. In the case of Enterococci, Pseudomonas aeruginosa and colony count, more beneficial results were found at lower pressure of 0.4 MPa and 90 min. Therein, the high level of microorganisms destruction was achieved varied between 81 and 92%. The applied HC allowed for selecting optimal operating parameters and process control through the application of gauge system.

2

Możliwość oceny liczby kawitacji w procesach kawitacji hydrodynamicznej z uwzględnieniem wpływu geometrii wzbudnika kawitacji

Lenik K., Ozonek J.

Pomiary Automatyka Robotyka

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2012

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R. 16, nr 6

60-63

PL

W artykule omówiono problematykę określenia wielkości liczby kawitacji w strefie skawitowanej cieczy w funkcji ciśnienia zasilania oraz długości strefy kawitacji z uwzględnieniem wpływu kształtu wzbudnika kawitacji. Badania przeprowadzono na opisanym stanowisku doświadczalnym, z wykorzystanymi do rejestracji manometrami piezoelektrycznymi i wykonanymi torami pomiarowymi, współpracującymi z komputerowym systemem zbierania i przetwarzania danych. W pracy podano przykłady zmian ciśnienia i temperatury po stronie rozprężnej kawitatora, a także zmian ciśnienia w funkcji odległości od miejsca powstawania kawitacji. Omówiono także możliwości oceny pulsacji ciśnienia w funkcji odległości od wzbudnika. Opracowana metodyka badań umożliwia analizę wpływu konstrukcji wzbudnika kawitacji hydrodynamicznej na długość strefy skawitowanej cieczy oraz określenia lokalnych oscylacji ciśnienia kawitacji.

EN

The paper presents the determination problem of cavitation number in cavitation zone in liquids as as the function of supply pressure and of the length of the cavitation zone. The problem concerns the influence of the orifice plates geometry. The research is described on experimental setup developed with the use of piezoelectric manometers to record the tracks compatible with the computer measuring system of data collection and processing. The paper gives some examples of changes in downstream pressure as well as temperature and pressure changes as the function of distance from the source of cavitation. The possibility of evaluation of pulse pressure at specified distances from the orifice plate is discussed. The presented research methodology allows for the analysis of the effect of orifice plate geometry on the length of the cavitation zone as well as the determination of local pressure oscillations in cavitation zone.

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Effect of different design features of the reactor on hydrodynamic cavitation process

Ozonek J., Lenik K.

Archives of Materials Science and Engineering

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2011

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Vol. 52, nr 2

112-117

EN

Purpose: The determination of the effect of the change of inducers' shape and surface on the cavitation process. Design/methodology/approach: Experimental studies of the effect of pressure changes in the function of the construction change of cavitation inducer on the hydrodynamic cavitation process. Findings: Selected effects of the cavitation process were discussed with variable pressures obtained by changing the geometry of cavitation inducer. Research limitations/implications: Analysis of the cavitation process in the function of geometric features of the cavitation inducer. Practical implications: The possibility of controlling the hydrodynamic cavitation process. Originality/value: The assessment of the effect of the cavitation reactor selection on the process or/and the selection of the solution for the specific conditions of the course of the cavitation process.