抄録
We have made a prototype of an ultrasonic sterilizer which induces cavitation utilizing the squeeze-film effect. It is demonstrated by experiments that the sterilizer can inactivate cryptosporidium oosysts efficiently. When the oosysts are batched by the sterilizer for ten minutes, more than 96% of the oosysts is inactivated. In the continuous treatment at the flow rate from 33 to 1500 ml a minute, 78.7% to 96.9% of the oosysts is inactivated. Moreover, the experimental results show that the ratio of inactivation becomes high as increase of the flow rate. Running costs of the sterilizer can be much lower than that of a conventional ultrasonic sterilizer.
