1. Introduction
Once oil comes in contact with water, it forms emulsion that needs to be treated before it is disposed, because of toxic and hazardous properties of its components. Current methods for treatment of oily wastewater before their disposal remain unsatisfactory. Even very low oil concentrations are toxic for microorganisms responsible for biodegradation in conventional sewage processes and therefore, removal of the oil phase is essential before effluent disposal. The oil removal process usually involves emulsion destabilization, which is not simple stage due to the presence of emulsifying agents that facilitate their stabilization [1], [2], [3] and [4]. Numerous techniques have been proposed for removal of oil so far [5], [6], [7] and [8].