Application of cavitational reactors for water disinfection: Current status and path forward

Gogate, Parag R.

doi:10.1016/j.jenvman.2007.07.001

Cited by 172 publications

(92 citation statements)

References 60 publications

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“…Bubbles can be produced by cavitation, initiated by hydrodynamic means, ultrasound, a laser or particle beam [10], or by direct dispersion of the gas in a liquid with different diffusers, usually made from porous materials [11], with gas flow through a submerged nozzle or orifice [12][13][14], in swirling jet flow [15], a Venturi nozzle [16], etc. An excellent state-of-theart review of different schemes and devices for small-bubble generation and their applications can be found in a recent paper [17].…”

Section: Introductionmentioning

confidence: 99%

Generation of Two‐Phase Air‐Water Flow with Fine Microbubbles

2016

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Aiming at the development of a low-cost technology for multipurpose water and surface treatment in the chemical industry and beyond, using microbubbles, a novel scheme of liquid-gas interaction within a specially designed bubble generator was tested. Its efficiency for the production of microbubbles with a size distribution in the micron range is confirmed. The basic element of the device is a vortex chamber with water supply through tangential ducts, while the gas (air) is introduced in a highly turbulent swirling flow of water in radial direction through the orifice in the gas supply duct, located on the chamber axis. Bubble diameters, bubble velocities in the pipe flow and effect of the output pressure on the bubble size distribution were studied.

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Section: Introductionmentioning

confidence: 99%

Generation of Two‐Phase Air‐Water Flow with Fine Microbubbles

2016

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“…16 Discussion until : 2016 (Cui et al, 2010;Torres et al, 2008;Son et al, 2012). 그러나 초음파 기술이 실제 현장에 적용되기 까지 는 많은 연구가 필요할 것으로 판단되는데, 특히 대부분 의 고도산화처리공정에서 제기되고 있는 scale-up에 대한 고려가 초음파 기술 분야에서도 역시 지속적으로 제기되 고 있다 (Son et al, 2011;Gogate, 2007 (1)…”

Section: 서 론unclassified

The Effect of Liquid Height on Sonochemical Reactions in 74 kHz Sonoreactors

Son¹

2016

Journal of Soil and Groundwater Environment

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Acoustic cavitation can induce various sonochemical effects including pyrolysis and radical reactions and sonophysical effects including microjets and shockwave. In environmental engineering field, ultrasound technology using sonochemical effects can be useful for the removal and mineralization of recalcitrant trace pollutants in aqueous phase as one of emerging advanced oxidation processes (AOPs). In this study, the effect of liquid height, the distance from the transducer to the water surface, on sonochemical oxidation reactions was investigated using KI dosimetry. As the liquid height/ volume increased (40~400 mm), the cavitation yield steadily increased even though the power density drastically decreased. It was found that the enhancement at higher liquid height conditions was due to the formation of standing wave field, where cavitation events could stably occur and a large amount of oxidizing radicals such as OH radicals could be continuously provided.

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“…Without the energy input, the cavity can no longer sustain itself and implodes during the compression cycle of ultrasonic wave. It is this implosion of the cavity that creates an unusual environment for chemical reactions (Gogate 2007;Rooze et al 2013). Localized hot spots are formed, which reach temperatures and pressures around 5000 K and 500 atm, respectively, depending on factors, such as ultrasonic power, frequency, hydrostatic pressure, temperature, solvent property, and dissolved gas (Gogate 2007;Gogate et al 2001Gogate et al , 2003.…”

Section: Mechanism Of the Sonochemical Processmentioning

confidence: 99%

Sonochemical techniques to degrade pharmaceutical organic pollutants

2015

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Pharmaceuticals are one of the chemical groups largely used in health care, diagnosis aids, cure, treatment, and prevention of disease. Increasing production and use of pharmaceutical products has led to the entry of these products into the environment and eventual pollution. Several processes have been studied including the use of ultrasound for the removal of these pollutants from the aquatic environment. This review summarizes recent research advances dealing with the development of sonochemical technologies for the degradation of pharmaceutical organic pollutants. The review also includes the mechanism of sonochemical processes, the characteristics of irradiation sources, and the types of reactors used. Moreover, the important factors affecting the sonochemical oxidation efficiency are discussed, including the electrical power, frequency, and temperature. Finally, this paper discusses the recent applications of sonochemical processes on the degradation of pharmaceutical organic pollutants and suggests new research directions for the development of this promising technology.

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Application of cavitational reactors for water disinfection: Current status and path forward

Cited by 172 publications

References 60 publications

Generation of Two‐Phase Air‐Water Flow with Fine Microbubbles

Generation of Two‐Phase Air‐Water Flow with Fine Microbubbles

The Effect of Liquid Height on Sonochemical Reactions in 74 kHz Sonoreactors

Sonochemical techniques to degrade pharmaceutical organic pollutants

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