Energy Analysis in Acoustic Cavitation

Vichare, Nilesh P.; Senthilkumar, Paramasivam; Moholkar, V. S.; Gogate, Parag R.; Pandit, Aniruddha B.

doi:10.1021/ie9906159

Cited by 131 publications

(40 citation statements)

References 7 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The expansion of the bubble is assumed as isothermal and its total compression is considered as adiabatic [41,42]. These assumptions, which are widely accepted since the lifetime of an oscillation at high frequency is relatively short with a very rapidly occurring collapse event, were pointed out by Yasui et al [43] using a more detailed model.…”

Section: Theoretical Packagementioning

confidence: 99%

Persulfate-enhanced sonochemical degradation of naphthol blue black in water: Evidence of sulfate radical formation

Ferkous

Merouani

Hamdaoui

et al. 2017

Ultrasonics Sonochemistry

136

View full text Add to dashboard Cite

This work explores the effect of persulfate (PS) on the sonochemical degradation of organic pollutants taking naphthol blue black (NBB), an anionic diazo dye, as a substrate model. The sonolytic experiments were conducted in the absence and presence of PS under various experimental conditions including acoustic power (10-80W), frequency (20 and 585kHz) and saturating gas (argon, air and nitrogen). Experimental results showed that PS decomposition into sulfate radical (SO) takes place by sonolysis and increasing PS concentration up to 1g/L would result in an increase in the NBB degradation rate. It was found that the PS-enhanced effect was strongly operating parameters dependent. The positive effect of PS decreased with increasing power and the best enhancing effect was obtained for the lowest acoustic power. Correspondingly, the PS-enhanced effect was more remarkable at low frequency (20kHz) than that observed at high frequency ultrasound (585kHz). Nitrogen saturating gas gave the best enhanced effect of PS than argon and air atmospheres. Theoretical (computer simulation of bubble collapse) and experimental measurements of the yields of free radical generation under the different experimental conditions have been made for interpreting the obtained effects of PS on the sonochemical degradation of the dye pollutant. The experimental findings were attributed to the fact that radical-radical recombination reactions occur at faster rate than the radical-organic reaction when the concentration of free radicals is too high (at higher sonochemical conditions).

show abstract

Section: Theoretical Packagementioning

confidence: 99%

Persulfate-enhanced sonochemical degradation of naphthol blue black in water: Evidence of sulfate radical formation

Ferkous

Merouani

Hamdaoui

et al. 2017

Ultrasonics Sonochemistry

136

View full text Add to dashboard Cite

show abstract

“…Normally, cavitational intensity decreases with an increase in temperature due to the formation of vaporous cavities which collapse less violently [23][24][25]. However, the Fenton process, in terms of generation of hydroxyl radicals, is significantly enhanced at higher operating temperatures [26][27][28][29].…”

Section: Effect Of Operating Temperaturementioning

confidence: 99%

Industrial wastewater treatment using hydrodynamic cavitation and heterogeneous advanced Fenton processing

Chakinala

Gogate

Burgess

et al. 2009

Chemical Engineering Journal

Self Cite

173

View full text Add to dashboard Cite

a b s t r a c tA combination of hydrodynamic cavitation and heterogeneous advanced Fenton process (AFP) based on the use of zero valent iron as the catalyst has been investigated for the treatment of real industrial wastewater. The effect of various operating parameters such as inlet pressure, temperature, and the presence of copper windings on the extent of mineralization as measured by total organic carbon (TOC) content have been studied with the aim of maximizing the extent of degradation. It has been observed that increased pressures, higher operating temperature and the absence of copper windings are more favourable for a rapid TOC mineralization. A new approach of latent remediation has also been investigated where hydrodynamic cavitation is only used as a pre-treatment with an aim of reducing the overall cost of pollutant degradation. It has been observed that approach of latent remediation works quite well with about 50-60% removal of TOC using only minimal initial treatment by hydrodynamic cavitation.

show abstract

“…The expansion of the bubble is assumed as isothermal and its total compression is considered as adiabatic [36,37]. These assumptions, which are widely accepted since the lifetime of an oscillation at high frequency is relatively short with a very rapidly occurring collapse event, were pointed out by Yasui et al [38] using a more detailed model.…”

Section: Single Bubble Sonochemistry Modelmentioning

confidence: 99%

Experimental and numerical investigation of the effect of liquid temperature on the sonolytic degradation of some organic dyes in water

Merouani

Hamdaoui

Boutamine

et al. 2016

Ultrasonics Sonochemistry

View full text Add to dashboard Cite

This paper presents a comprehensive experimental and numerical investigation of the effects of liquid temperature on the sonochemical degradation of three organic dyes, Rhodamine B (RhB), Acid orange 7 (AO7) and Malachite green (MG), largely used in the textile industry. The experiments have been carried out for an ultrasonic frequency of 300 kHz. The obtained experimental results were discussed using a new approach combining the results of single-bubble event and the number of active bubbles. The single-bubble event was predicted using a model that combines the bubble dynamics with chemical kinetics occurring inside a bubble during the strong collapse. The number of active bubbles was predicted using a method developed in our previous work. The experiments showed that the degradation rate of the three dyes increased significantly with increasing liquid temperature in the range 25-55°C. It was predicted that the main pathway of pollutants degradation is the attack by OH radicals. The simulations showed that there exists an optimum liquid temperature of about 35°C for the production of OH inside a bubble whereas the number of active bubbles increased sharply with the rise of the liquid temperature. It was predicted that the overall production rate of OH increased with increasing liquid temperature in the range 25-55°C. Finally, it was concluded that the effect of liquid temperature on the sonochemical degradation of the three dyes in aqueous phase was controlled by the number of active bubbles in the range 35-55°C and by both the number of bubbles and the single bubble yield in the range 25-35°C.

show abstract

Energy Analysis in Acoustic Cavitation

Cited by 131 publications

References 7 publications

Persulfate-enhanced sonochemical degradation of naphthol blue black in water: Evidence of sulfate radical formation

Persulfate-enhanced sonochemical degradation of naphthol blue black in water: Evidence of sulfate radical formation

Industrial wastewater treatment using hydrodynamic cavitation and heterogeneous advanced Fenton processing

Experimental and numerical investigation of the effect of liquid temperature on the sonolytic degradation of some organic dyes in water

Contact Info

Product

Resources

About