| 摘要 |
PROBLEM TO BE SOLVED: To dispose of pollutants adhering to bubbles efficiently. SOLUTION: The surface of polluted water W stored in a polluted water tank 2 is moved vertically between an upper part sensor 5 and a lower part sensor 6 with the movement of the surface controlled by a control part 7 so that the bubbles B accumulated on the surface are discharged efficiently from a bubble discharge duct 24.
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