OIL/WATER SEPARATOR

PROBLEM TO BE SOLVED: To provide an oil/water separator which can unite an oil to be separated with fine bubbles even if the oil is fine and reduce the oil concentration of a liquid to be treated below the oil concentration level of an effluent. SOLUTION: The oil/water separator 10 keeps the air dissolved in the liquid to be treated by being pressed by a pump 31 with an air supply into the liquid to be treated to eject the dissolved air as bubbles with the liquid to be treated from a nozzle 33 in a pipeline 13 arranged in the lower part of a treatment tank 81, and to supply the liquid to be treated ejecting from the nozzle 33 with bubbles from the pipe line 13 to the treatment tank 81, so that the oil contained in the liquid to be treated is made to float with bubbles in the treatment tank 81 and the liquid to be treated is separated into water and the oil, wherein a communicating hole 91 is arranged which sucks the liquid to be treated of the treatment tank by flow of the liquid to be treated ejecting from the nozzle 33 to the pipe line 13. COPYRIGHT: (C)2007,JPO&INPIT