| 摘要 |
PROBLEM TO BE SOLVED: To excellently degas and sterilize water without using chemicals, a filter membrane or an ion exchange membrane by installing a vacuum degassing device in which water to treat is boiled at a low temperature with the aid of ultrasonic wave energy and a circulation-type degassing device in which the degassed water is pressurized and expanded adiabatically in a reduced pressure chamber. SOLUTION: Water is taken into an introducing cylinder 3 after being descaled in an electrode cylinder 1 when a stop valve 23 and a inlet solenoid valve 24 is opened with a degassing chamber 8 kept in a high vacuum state by a vacuum pump 22. Gases in the water are separated as bubbles from ultrasonic wave vibration elements 31 by radiating ultrasonic waves onto the water in the introducing cylinder 3. Such degassed water is stored in a water storing space which is interconnected with an inner circumferential chamber 8a and an outer circumferential chamber 8b at the respective bottoms in the degassing chamber 8, and the water is overflowed into a circulating degassing tank 19 when the level of the water is over an overflow outlet 9. After the degassed water is fed by pressure to an injection nozzle 18 by a circulating pump 13, the degassed water is expanded adiabatically by colliding against the inner wall surface of a circulating degassing tank 19, resulting in sterilization to break down microorganism in the water.
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