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Ultrasonic wave can be generated in the liquid when cavitation

The ultrasonic wave is a physical energy, acting on the liquid when cavitation can be generated. The so-called cavitation means under the action of ultrasonic waves, the liquid in the microbubble generating oscillation, and the collapse of a series of processes. The moment of rupture of cavitation bubbles, which can produce high-energy, high-temperature, high-pressure, discharge and plasma phenomenon. Therefore, high-energy, high-frequency ultrasonic wave has been applied to the degradation of pollutants. High energy ultrasound, and other conditions, such as extreme pH values, H2O2, Photooxidation Fenten oxidation and electrochemical oxidation when used in combination, more effective degradation of pollutants. High-energy, high-frequency ultrasound can kill the microorganisms. The low-energy, low-frequency ultrasonic radiation on the role of microorganisms is diverse, effect depends primarily on the size of the ultrasonic power, frequency level, the role of the length of time and the traits of the microorganism itself. The ultrasonic irradiation to the aqueous phase of the activity of the enzymes and microorganisms can increase or decrease.

Low-energy ultrasound is widely used in enzyme engineering, cell engineering and fermentation engineering. However, low-energy and low frequency ultrasound technology applications in biological wastewater treatment rarely reported. Reported the ultrasonic assisted under optimal conditions be able to speed up the removal of glucose analog preparation of COD in wastewater. Another study showed that low-energy ultrasonic radiation microorganisms can accelerate the degradation of pollutants.

Azo widely used in cotton spinning and silk printing and dyeing process, there are a lot in the wastewater. This study selected representative nonbiodegradable material, study the ultrasonic activated sludge biological degradation accelerated and the related influencing factors that increase the permeability of the cell membrane with ultrasonic intensity, there is an increasing trend. When the ultrasonic intensity of 1.6W / L, chroma removal rate increased 13.1%, but 11% of the increase in the value of the permeability of the film under the same conditions, when the ultrasonic intensity of 40W / L of increased membrane permeability value of 39.0%, the increase in value of the color removal rate of only 9.3%. membrane permeability and non-linear relationship between the color removal rate, indicating that the membrane permeability is not the only factor to affect the color removal rate.

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