To provide a separation method of a granulation type in which the emulsion state of emulsified oil contained in water extracted from a gravity separation tank is destructed by adding a treating agent to do fine separation and an apparatus for the method.
Raw water is supplied in an ascending flow to the gravity separation tank (1), oil is adhered to a netlike skeleton body (3) packed in the contact separation chamber (4) of the tank (1) and converted into oil drops, the oil drops in which buoyancy is superior to adhesion are floated from the chamber (4), and the granulated oil in the raw water is separated. Next, the emulsified oil which could not be treated in the chamber (4) is extracted from the tank (1), agitated by a line mixer (12) while being added with the treating agent, supplied to a precise separation tank after being passed through a strainer (15), and passed through a lipophilic fiber sheet (18) housed in a fine separation chamber (21) to adsorb the oil to the fibers. The oil extracted from the sheet (18) by buoyancy is floated from the chamber (21), and the granulated oil and treatment water are separated and discharged. High separation efficiency can be kept over a long time.
MIZOBUCHI KATSUNOBU
FUJITA KUNIO
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