The use of power ultrasound for water treatment

Pétrier, Christian

doi:10.1016/b978-1-78242-028-6.00031-4

Cited by 37 publications

(28 citation statements)

References 161 publications

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“…An increase in ultrasonic intensity may increase the number of active cavitation bubbles and the production of hydroxyl radicals. Similar results have been reported in the literature [4,21,[24][25][26]. Under ultrasonic irradiation, there is a linear relationship between the H2O2 concentration generated and irradiation time (Figure 2a).…”

Section: Resultssupporting

confidence: 90%

“…The hydroxyl radical exhibits a high oxidation potential and can oxidize organic substrates directly, causing their degradation or mineralization [1,4,5]. However, hydroxyl radicals have a very short lifetime, and tend to combine with one another to form H2O2 [2,3,10].…”

Section: Resultsmentioning

confidence: 99%

“…Ultrasonic irradiation of liquids causes acoustic cavitations, i.e., the formation, growth and implosive collapse of bubbles. Such cavitation generates local sites of high temperature and pressure for short periods of time, with these being responsible for unusual sonochemical effects [3,4]. The cavitation process is influenced by several factors such as frequency, gas properties (solubility, heat capacity ratio, thermal conductivity) and solvent properties (vapor pressure, density, viscosity, surface tension).…”

Section: Introductionmentioning

confidence: 99%

“…However, the presence of oxygen also allows the H . forming OOH to be scavenged, with this acting as an oxidizing agent [4,7,8]. The hydroxyl radicals generated during cavitation can be used in the oxidative degradation of organic pollutants in an aqueous system [9][10][11].…”

Section: Introductionmentioning

confidence: 99%

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Sonochemical Formation of Hydrogen Peroxide

Ziembowicz

Kida

Koszelnik

2017

The 2nd International Electronic Conference on Water Sciences

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Abstract:The work detailed in this study utilized 20 kHz ultrasonic irradiation as a mechanism of hydrogen peroxide production. The effects of various operating parameters were investigated, including ultrasonic intensity; solution pH; source of water; initial dibutyl phthalate concentration and the presence of hydrogen peroxide. During the irradiation, the H2O2 concentration was monitored. The results indicate that H2O2 is produced by cavitation during ultrasonic irradiation. An increase in ultrasonic intensity increases the amount of hydrogen peroxide produced. The initial pH of the solution does not affect the efficiency of processes substantially. H2O2 is regarded as one of the most effective additives enhancing the sonochemical production of hydroxyl radicals and hydrogen peroxide. Above a 0.1 mM dose of H2O2, the amount of H2O2 formed decreased as the concentration of H2O2 increased. Thus, the concentration of hydrogen peroxide plays a crucial role in the extent to which the effectiveness of the combined process is enhanced. The negative effect on reactions of the presence of additional components in the reaction solution was also confirmed. It was therefore concluded that the experimental evaluation of optimum parameters of hybrid processes is a matter of importance.

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Section: Resultssupporting

confidence: 90%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Sonochemical Formation of Hydrogen Peroxide

Ziembowicz

Kida

Koszelnik

2017

The 2nd International Electronic Conference on Water Sciences

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“…Moreover, high temperatures can cause degassing of the liquid phase reducing the number of microsite available for cavitation. The degradation rate of organic compounds was shown to be directly proportional to temperature as organic molecules migrated from the bulk solution to the gas-liquid interface region where the temperature and hydroxyl radical concentration are high (Gallego-Juárez and Graff 2015;Neis 2015;Pétrier 2015). This phenomenon was observed by Im et al (2013) while investigating ultrasound degradation of acetaminophen and naproxen in the presence of singlewalled carbon nanotubes.…”

Section: Influence Of the Temperaturementioning

confidence: 92%

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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Degradation of residual dyes in textile wastewater by ozone: Comparison between mixed and bubble column reactors

et al. 2016

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A noticeable amount of dyes may remain in the wastewater downstream of dyeing facilities giving anaesthetic colourations as well as environmental concerns. Conventional biological treatment alone cannot guarantee a sufficient decolouration and tertiary treatments have to be necessarily considered. Two oxidation schemes by ozone were considered in this work. A bubble column reactor (as a benchmark, in agreement with industrial applications) and a recycle well‐mixed reactor were compared to reach the highest decolouration of standard dyes. In addition, hydrodynamic and ultrasonic cavitation were considered in the recycled well‐mixed reactor to intensify its performance. The decolouration analysis was carried out for two dye classes (reactive and disperse), characterized by very different physical and chemical features. It appeared that some benefit was brought by ultrasound cavitation in the case of disperse dye only, while the degradation of the reactive dye was not intensified by the above hydraulic phenomenon. Ozone treatment was protracted to obtain different decolouration degrees of wastewater generated by wool dyeing. The resulting water was tested as a recycled process fluid to prepare fresh dyeing liquors, where devising the minimum decolouration degree became one of the quality specifications for recycling water back to dyeing.

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The use of power ultrasound for water treatment

Cited by 37 publications

References 161 publications

Sonochemical Formation of Hydrogen Peroxide

Sonochemical Formation of Hydrogen Peroxide

Sonochemical techniques to degrade pharmaceutical organic pollutants

Degradation of residual dyes in textile wastewater by ozone: Comparison between mixed and bubble column reactors

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