Oily wastewater is the major problem of many industries such as crude oil production, oil refinery, petrochemical industry,metal processing, food processing, textile processing, compressor condensates, lubricant, and cooling agents, metallurgical, floor washing, etc. The amount of oil in oil/water emulsions varies from industry to industry. The importance of separation of oil from oil/water mixtures is due to its toxic characteristics and severe environmental hazards. The size of the oil droplets in emulsion is usually in the range of 0.1–10 m. Environmental guidelines require that maximum total oil and grease concentrations in release waters are 10–15 mg/L . Several techniques are used for theseparation of emulsions such as physical, chemical, and biological