Can rapid pressure decrease induced by supercavitation efficiently eradicate Legionella pneumophila bacteria?

Šarc, Andrej; Oder, Martina; Dular, Matevž

doi:10.1080/19443994.2014.979240

Cited by 34 publications

(20 citation statements)

References 33 publications

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“…In the mentioned cases the formation of bubbles is usually not desired. There are other research fields and applications in which bubble formation is desired, e.g., the cleaning of surfaces (Verhaagen and Fernandez Rivas 2015;Bolanos-Jimenez et al 2017), the removal of bacteria and germs in water (Sarc et al 2016), the fragmentation of kidney stones in the human body by acoustic cavitation called lithotripsy, the targeted release of pharmacological agents (both Brennen 2015) and the enhancement of the efficiency of mixing processes (Spiridonov 2015).…”

Section: Introductionmentioning

confidence: 99%

Bubble nucleation from micro-crevices in a shear flow

et al. 2017

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The formation of gas bubbles at gas cavities located in walls bounding the flow occurs in many technical applications, but is usually hard to observe. Even though, the presence of a fluid flow undoubtedly affects the formation of bubbles, there are very few studies that take this fact into account. In the present paper new experimental results on bubble formation (diffusiondriven nucleation) from surface nuclei in a shear flow are presented. The observed gas-filled cavities are micrometre-sized blind holes etched in silicon substrates. We measure the frequency of bubble generation (nucleation rate), the size of the detaching bubbles and analyse the growth of the surface nuclei. The experimental findings support an extended understanding of bubble formation as a self-excited cyclic process and can serve as validation data for analytical and numerical models.

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Section: Introductionmentioning

confidence: 99%

Bubble nucleation from micro-crevices in a shear flow

et al. 2017

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“…Concurrently, we developed several cavitation reactors [26] and filed several national [27] and international [28] patents. The shift from applied towards basic research came with studies of cavitation influence on bacteria Legionella pneumophila [29]. In our next study, it was demonstrated that the least aggressive cavitation type (supercavitation) hydrodynamically is the most destructive against the bacteria [30].…”

Section: Contributions Of Our Research Group On the Topic Of Hc Use Imentioning

confidence: 78%

Cavitation as a Potential Technology for Wastewater Management – An Example of Enhanced Nutrient Release from Secondary Pulp and Paper Mill Sludge

Sežun

Kosel

Zupanc

et al. 2019

SV-JME

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Wastewater recycling and sludge removal in the paper industry account for about 60 % of all process costs. New and environmentally friendly wastewater treatment techniques are, therefore, continually being developed. Cavitation exploitation is currently a well-investigated topic that is also interesting for the paper production industry. This study investigates efficiency of hydrodynamic cavitation alone and in combination with the addition of NaOH for the treatment of secondary pulp and paper mill sludge in order to enhance nutrient release. First, two laboratory-scale devices were tested: the blow-through and the rotating hydrodynamic cavitation generator. The latter set-up proved to be more efficient: therefore, further experiments were performed on its pilot-scale version. The results showed an increase of soluble chemical oxygen demand (CODs) by 514 mg/L, total nitrogen (Nt) by 17.4 mg/L, and total phosphorous (Pt) by 2.3 mg/L. To further increase nutrient release combination of cavitation and sludge sample alkalinization was tested. The addition of NaOH and 30 min cavitation of secondary sludge (500 L) significantly improved CODs and Nt release by 2400 mg/L and 120 mg/L, respectively. Microbiological photos revealed a definite disintegration of sludge flocks. According to our estimates, 1.9 kg of released CODs from alkaline pre-treated and cavitated sludge would cost only one euro.

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“…One more time harnessing cavitation may bring desired results. Use of cavitation for pathogen deactivation [38] and [39] and wastewater treatment is well developed [26] and [27].…”

Section: Conclusion and Discussionmentioning

confidence: 99%

Influence of Hydrodynamic Cavitation on Intensification of Laundry Aqueous Detergent Solution Preparation

Perdih

Širok

Dular

2017

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Washing machines are one of the most energy and water demanding domestic appliances. Over years, a significant effort of the scientific community has been invested into making laundry more "sustainable". Nevertheless, the preparation of detergent solution has been entirely overlooked step of laundering. The preparation of aqueous detergent solutions in the currently available washing machines takes up to 10 minutes. In this work, we propose a design of a special rotary hydrodynamic cavitation generator, which would impact this process. New detergent dissolution rates have been experimentally tested on the laboratory model washing machine using the designed cavitation generator. The dissolution rates have been determined from the measurements of the undissolved detergent after the specific time of treatment. Additionally, the influence of hydrodynamic cavitation on that process has been isolated and investigated. To do so, two flow regimes have been established: the regime with cavitation present and the regime where cavitation was not present. In order to evaluate cavitational intensity, pressure oscillations inside cavitation generator have been recorded. Results indicate that cavitation significantly increases the detergent dissolution rates. In the cavitation flow regime, more than 80 % of the detergent is dissolved in approximately 10 seconds. With no cavitation present, about 150 seconds are needed to dissolve the same amount of the detergent. Intensification of the process can be attributed to mechanical effects of cavitation. This research shows that use of the cavitation generators in the washing machines could lead to shorter washing programs and henceforth potential water and energy savings. Highlights• Hydrodynamic cavitation was used to prepare aqueous detergent solution.• Special rotary hydrodynamic cavitation generator was designed.• Cavitation significantly improves detergent dissolution rates. • Cavitation generators could improve water and energy efficiency of washing machines.

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Can rapid pressure decrease induced by supercavitation efficiently eradicate Legionella pneumophila bacteria?

Cited by 34 publications

References 33 publications

Bubble nucleation from micro-crevices in a shear flow

Bubble nucleation from micro-crevices in a shear flow

Cavitation as a Potential Technology for Wastewater Management – An Example of Enhanced Nutrient Release from Secondary Pulp and Paper Mill Sludge

Influence of Hydrodynamic Cavitation on Intensification of Laundry Aqueous Detergent Solution Preparation

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