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Priority claimed from JP6175241Aexternal-prioritypatent/JPH0838806A/en
Application filed by Fsk IncfiledCriticalFsk Inc
Application grantedgrantedCritical
Publication of TW358798BpublicationCriticalpatent/TW358798B/en
A kind of separating oil from water contaminated with emulsified oil and having several thousand ppm oil, comprising: (a) introducing the oil-contaminated water in a separation tank; (b) adding 5 to 30 ppm surfactant in the oil-contaminated water, the surfactant being selected from aryl quaternary ammonium salt, alkyl imidazoline salt, polyoxyethylene alkylamine, imidazoline betaine and carboxyl betaine; (c) cycling the oil-contaminated water obtained in (b) into a bubble-generating apparatus and introducing air into the apparatus and mixing the water with air bubbles; and (d) jetting out the air-water mixture obtained in (c) into the separation tank so the oil particles enveloped by air bubbles float up.