The aim of this work is to present an alternative technique for the treatment of waters contaminated by dispersed oil. Furthermore, the treatment system should achieve high removal efficiencies even under unfavorable conditions, when oil is finely dispersed in water phase and oil droplet sizes range of 10 – 30 μm and concentrations between 100 and 200 mg/L. The system presented in this work focuses the association of centrifugal separation led in hydrocyclone and the flotation operation. The considered system is characterized by the association of these two processes, resulting the set-up in a compact unit (centrifugal flotation system). The bubbles generation, the flocculation and the droplet-bubble contact were performed through a static mixer, while the separation of the phase rich in oil (froth phase) was promoted by a hydrocyclone. The oil-in-water emulsions were prepared from crude oil from P-31 platform (PETROBRAS), with 29 oAPI. The emulsions used to be very stable with oil droplet sizes between 10 and 20 μm and concentrations between 90 and 125 mg/L.
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