Water pollution is a kind of environment problems all over the world and phenol wastewater is been concerned for it is toxic and difficult to be degraded.In this paper,the principle and application in wastewater treatment of ultrasonic cavitation are introduced. Then phenol which is a typification of phenolic compounds is chosen as the research object. The feasibility and influencing factors are studied in the degradation of phenolic compounds by ultrasonic cavitation、H_2O_2、Fenton reagent、CuO/H_2O_...