| 摘要 |
PROBLEM TO BE SOLVED: To provide an oil separation tank with a simple structure and capable of reliably separating oil in waste water even when the flow rate of the waste water is increased.SOLUTION: A backing plate 7 into which waste water W discharged from a drainage pipe 5 falls is provided in a lower part of an outlet 5a of the drainage pipe 5. A curved part 7b flowing down the backing plate 7 on a downstream side of a position at which the waste water W in the backing plate 7 falls, and imparting an upward swirl flow F2 to the waste water W flowing into a first measure M1 on an uppermost stream side out of a plurality of measures is formed. |
