Patent ID: 7303686

Claim:
Apparatus for separation of flocculating suspension by filtration in a fluidized layer of a sludge blanket comprising: an essentially upward widening separator having inclined outer walls, the inner volume of said separator containing a separation space and being provided with an inlet of liquid with suspension in a bottom part of said separator and means for withdrawal of liquid without suspension in an upper part of said separator, in the separation space, in operation, there is formed a fluidized layer of sludge blanket, above the surface of which purified water is located, thickened suspension being withdrawn from the separation space, wherein the separation space in the separator, at least in one place over the inlet into the separator and under the sludge blanket surface, is upwards suddenly widened, and at the level of this sudden widening at least one withdrawal spot of an excess thickened suspension, falling as density streams along at least one of said inclined outer walls from the fluidized layer of sludge blanket, is located inside the separation space in the separator.