Oil droplet flotation unit with weirs and hydraulic means

The present invention relates to a flotation apparatus for separating in particular oil from a dispersion containing water as continuous phase and oil as dispersed phase, the apparatus comprising a vessel comprising in its longitudinal direction one or more longitudinal cell sections, wherein at least one of the one or more longitudinal cell sections comprises:- at least one underflow weir,- at least one overflow weir, wherein the overflow weir is located in a distance to and displaced in the direction to the downstream end of the vessel from the underflow weir,- at least one gas injection means being located vertically below the underflow weir or being located in the channel formed between the underflow weir and the overflow weir,- at least one removal means for removing the second fraction being formed during the operation of the flotation apparatus on the liquid level from the liquid level and- at least one hydraulic means for hydraulically pushing the second fraction being formed during the operation of t