| 摘要 |
PROBLEM TO BE SOLVED: To provide a compact gravitational separation apparatus enhanced in the flotation separation efficiency of a floating substance in treated water and capable of shortening the time required in flotation separation. SOLUTION: The treated water reaches a gravitational separation structure 31 and an oil component is subjected to floatation separation in respective inclined flow channels 32. That is, the oil component rising in the respective inclined flow channels 32 gradually rises along the undersurfaces of the inclined separation plates 3 for the upper walls of the respective inclined flow channels 32 to move to floating passages (a) from their upper side openings. Thereafter, the oil component rises through the floating passages (a) to be discharged to the upper part of the gravitational separation structure 31. As a result, the compactification of the gravitational separation apparatus 50 is achieved, the flotation separation efficiency of the oil component in the treated water is enhanced and the time required in the flotation separation can be shortened. Further, since flow obstructing members 5 are provided to the floating passages (a) at a predetermined pitch in a water flowing direction, the vertical rising of the oil component in the floating passages (a) is hardly obstructed by the treated water. COPYRIGHT: (C)2009,JPO&INPIT
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