抄録
In pure liquids and solutions, generation and collapse of bubbles caused by ultrasound result in extraordinary high local temperature and pressure. This phenomenon leads to physical and chemical effects called sonochemistry. Sonochemistry are attributed to high temperature and production of OH and H radicals that can decompose different kinds of water pollutant such as chlorinated organic materials, surfactants, polymers and germs. Among the technologies for wastewater treatment, the sonochemical method is very attractive because it is easy and safe to operate, and hardly produces its by-products. Development of a sonochemical reactor with high efficiency is necessary for its practical application. Calorimetry of water is used for evaluating the ultrasound power in the reactor. The sonochemical efficiency is defined as the ratio of number of reacted molecules to ultrasound energy. For small reactors, the sonochemical efficiency has maximum values in the frequency range from 200 to 600 kHz. On the other hand, for large reactors, the sonochemical efficiency depends on the dimensions of the reactor in addition to frequency. Liquid mixing and the superposition of two ultrasonic fields enhance sonochemical reactions. The combination of sonochemical and other oxidation methods is a promising technology of decomposing water pollutants.
https://ror.org/04chrp450 
