Flow-mode water treatment under simultaneous hydrodynamic cavitation and plasma

Абрамов, В. О.; Abramova, Anna V.; Cravotto, Giancarlo; Nikonov, Roman V.; Fedulov, Igor S.; Иванов, В. К.

doi:10.1016/j.ultsonch.2020.105323

Cited by 58 publications

(33 citation statements)

References 53 publications

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“…In actual numbers, 6 L of cyanobacteria contaminated water (5 × 10 5 cells/mL) was disinfected in less than 15 s. This volume efficiency is a remarkable improvement over the known methods of underwater discharge generation (Table 1), even when we compare the HCPJ with a few known works where authors also employed cavitation clouds to sustain the underwater discharge [29,32,33]. Very recently, a plasma-cavitation device for water treatment of throughput similar to ours was presented in [30], but unfortunately no details were given in the article with respect to discharge ignition or energy consumption, so we can not make a qualified comparison to our previous results in [28]. In both of these plasma-cavitation device experiments [28,30], the high volumetric efficiency (of almost 1 m 3 /h) was obtained for direct plasma remediation of water.…”

Section: Introductionmentioning

confidence: 58%

“…Very recently, a plasma-cavitation device for water treatment of throughput similar to ours was presented in [30], but unfortunately no details were given in the article with respect to discharge ignition or energy consumption, so we can not make a qualified comparison to our previous results in [28]. In both of these plasma-cavitation device experiments [28,30], the high volumetric efficiency (of almost 1 m 3 /h) was obtained for direct plasma remediation of water. However, according to our best knowledge, so far, there are no reports on using such devices for the production of PAW as an active medium itself, allowing flow rates close to 1 m 3 /h to produce PAW with proven remote, ex-plasma biocidal activity.…”

Section: Introductionmentioning

confidence: 90%

“…Organic dye removal alternating current arc in a cavitation field 400 mL/min [29] Organic dye and E. coli removal discharge in cavitation field 16,700 mL/min [30] 1 The first published results of the HCPJ discharge setup operated at atmospheric pressure conditions.…”

Section: Introductionmentioning

confidence: 99%

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Mass Production of Plasma Activated Water: Case Studies of Its Biocidal Effect on Algae and Cyanobacteria

Čech

Šťahel

Ráheľ

et al. 2020

Water

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Efficient treatment of contaminated water in industrially viable volumes is still a challenging task. The hydrodynamic cavitation plasma jet (HCPJ) is a promising plasma source for industrial-scale generation of biologically active environments at high flow rates of several m3/h. The combined effect of a hydro-mechanical phenomenon consisting of hydrodynamic cavitation and electrical discharge in cavitation voids was found to be highly efficient for large-volume generation of reactive oxygen species, ultraviolet (UV) radiation, and electro-mechanical stress in a liquid environment. Here, the persistence of biocidal properties of HCPJ-activated water (i.e., plasma-activated water (PAW)) was tested by the study of algae and cyanobacteria inactivation. Algae and cyanobacteria cultivated in media containing PAW (1:1) were completely inactivated after 72 h from first exposure. The test was performed at a total power input of up to 0.5 kWh/m3 at the treated liquid flow rate of 1 m3/h. A beneficial modification of our previous HCPJ design is described and thoroughly characterized with respect to the changes of hydrodynamic flow conditions as well as discharge performance and its optical characteristics. The modification proved to provide high biocidal activity of the resulting PAW, which confirms a strong potential for further design optimization of this promising water (liquid) plasma source.

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Section: Introductionmentioning

confidence: 58%

Section: Introductionmentioning

confidence: 90%

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Mass Production of Plasma Activated Water: Case Studies of Its Biocidal Effect on Algae and Cyanobacteria

Čech

Šťahel

Ráheľ

et al. 2020

Water

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“…Hence, discharge plasma in a gas-liquid water environment is considered one of the most promising technologies that can be applied in various fields, i.e., water pollutant removal, biological inactivation, polymer surface modification, chemical synthesis, and nanoparticle synthesis [6][7][8][9][10]. In addition to the chemical effects, the discharge plasma in the gas-liquid water environment also results in physical effects, i.e., ultraviolet radiation and shockwave Plasma 2021, 4 310 generation [6,7,[11][12][13][14][15][16][17]. Another advantage regarding the use of discharge plasma in the gas-liquid water environment is that the discharge plasma is usually more easily formed in the gas phase than in the liquid state.…”

Section: Introductionmentioning

confidence: 99%

Pulsed Discharge Plasma in High-Pressure Environment for Water Pollutant Degradation and Nanoparticle Synthesis

Diono

Machmudah

Kanda

et al. 2021

Plasma

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The application of high-voltage discharge plasma for water pollutant decomposition and the synthesis of nanoparticles under a high-pressure argon gas environment (~4 MPa) was demonstrated. The experiments were carried out in a batch-type system at room temperature with a pulsed DC power supply (15.4 to 18.6 kV) as a discharge plasma source. The results showed that the electrode materials, the pulsed repetition rates, the applied number of pulses, and the applied voltages had a significant effect on the degradation reactions of organic compounds. Furthermore, carbon solid materials from glycine decomposition were generated during the high-voltage discharge plasma treatment under high-pressure conditions, while Raman spectra and the HRTEM images indicated that titanium dioxide with a brookite structure and titanium carbide nanoparticles were also formed under these conditions. It was concluded that this process is applicable in practice and may lead to advanced organic compound decomposition and metal-based nanoparticle synthesis technologies.

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“…Only the formation of cold plasma in the fluid flow gave encouraging results among methods involving the use of electric current. The inactivation of microorganisms achieved by this method can reach up to 99.99%, even at very high initial concentrations (25 × 10 7 bact./mL, which corresponds to wastes in medical institutions) [10]. However, being a technique not fully investigated and optimized, a real application was not reported.…”

Section: Introductionmentioning

confidence: 99%

Influence of Acoustic Oscillations on Continuous-Flow Water Disinfection

et al. 2020

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Water disinfection and potential sterilization in continuous flow was achieved in a hybrid reactor with a broadband hydrodynamic emitter combined with ultrasonic vibrations at different frequencies and with excess pressure. Such a combination showed synergistic effects by increasing the acoustic power in the reactor vortex flow. The present combined physical treatment, compared with sonication alone, could increase microorganism inactivation by 15–20%.

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Flow-mode water treatment under simultaneous hydrodynamic cavitation and plasma

Cited by 58 publications

References 53 publications

Mass Production of Plasma Activated Water: Case Studies of Its Biocidal Effect on Algae and Cyanobacteria

Mass Production of Plasma Activated Water: Case Studies of Its Biocidal Effect on Algae and Cyanobacteria

Pulsed Discharge Plasma in High-Pressure Environment for Water Pollutant Degradation and Nanoparticle Synthesis

Influence of Acoustic Oscillations on Continuous-Flow Water Disinfection

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