Ultrasonic cavitation effect provides probable conditions for degradation of harmful organic substance, and thus realizes wastewater treatment by ultrasonic technology. In sewage treatment process, acoustic cavitation can greatly increase the degradation rate. By collapse of bubbles, a large amount of energy will be released to cause chemical bonds cleavage, and form hydroxyl (OH) and hydrogen (H) radicals, and oxidize dissolved organic compounds, formed as a consequence of OH, HO2, inorganic ions, and other easily degradable organism. So ultrasonic method can make non-biodegradable organics easily to degradation.

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