| 摘要 |
PROBLEM TO BE SOLVED: To effectively sterilize the inside of a recovery and circulation system for resistivity adjusted water without influencing the resistivity value of recovered water. SOLUTION: The recovered water from a can inspection process 10 is sequentially supplied to and treated in an ozone decomposer 1, a fine particle remover 2 and an ultraviolet sterilizer 3. After adding ozone to a part of effluent water from the ultraviolet sterilizer 3 in an ozone dissolver 4, the effluent water is circulated to the can inspection process 10. By adding ozone in the ozone dissolver 4, subsequent circulation piping and can inspection process 10 are sterilized. After removing residual ozone in the ozone decomposer 1, ultraviolet irradiation is carried out in the ultraviolet sterilizer 3, which prevents a change in the resistivity value due to ozone decomposition by ultraviolet rays.
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