As one of the sterilization method,ultrasound has received much research attention.Ultrasound alone can have a good sterilization effect.However,if ultrasound is used in industrial settings and required to kill bacteria at a high rate,very high ultrasonic power is needed,consuming a great deal of energy.In other words,as a means of sterilization,ultrasound alone is too expensive to be used in the industrial en- vironment.Nonetheless,when used in conjunction with other sterilization technique,the effect of u...