Arrangement for separation of a suspension or emulsion from liquids by flotation

Claim 1

Arrangement for the separation of suspensions or emulsions from liquids by flotation, comprising a vessel with a side wall, a partition wall within said side wall defining a flotation space with an upper and a lower part, means for supplying liquid to be treated to the arrangement, means for the removal of treated liquid, means for the removal of flotated foam and of sedimented sludge, the lower part of the flotation space widening from the bottom upwards to a top part, the supply of the treated liquid terminating in the flotation space, means for the removal of foam provided with an inlet at the top part of the flotation space and continuing downwards at an inclination beyond the flotation vessel, a collecting space for cleaned liquid formed between the wall of the vessel and the upper part of the partition wall in the upper part of the tank and separated by the upper part of the partition wall from the flotation space, transfer openings provided in the partition wall above the maximum width thereof, said transfer openings connecting the flotation space with the space for cleaned liquid, a rectifying wall provided in front of said transfer openings for preventing passage of the flotated suspension into the collecting space of cleaned liquid, and means including a collecting trough for the removal of cleaned liquid in the top part of the collecting space for cleaned liquid.