Abstract: A filter arrangement comprises a belt filter for the separation of particles from a liquid, for which purpose the liquid is caused to flow towards the filter through an inlet (13) at one end of the filter, and the separated particles are collected at the opposite end. The belt filter consists of an endless filter belt (10) which runs over guide rollers (2, 3) in the direction of the water as it flows in, and supports and drains the particles as they are conveyed on an upper, forward-moving part of the filter belt from one end to the opposite end over a first drainage zone. A second drainage zone is arranged on the upper part (11) of the belt by the arrangement of a drainage arrangement (17) which comprises a blower unit (18) extending across the entire width of the filter belt (10) to direct currents of air against the under-side of the upper part (11) of the filter belt (10), so as to blow water from the belt and the particles over the second drainage zone.

Abstract: The present invention relates to a device for the separation of a liquid from a sludge (12) or a liquid containing particles by means of a rotatable drum (1), inside which an inlet device for the supply of a sludge (12) or of a liquid containing particles debouches, the jacket (3) of said drum exhibiting ports (2) for making said separation of liquid possible, the drum (1) in its interior exhibiting a screw-type flange element (11) for the forward feed of the sludge, which flange (11) follows the rotating movement of the drum, said flange (11) extending from the inside of the jacket (3A) of the drum in direction towards the center (13) of the same.The invention makes possible an effective supply of sludge (12) etc. to the interior of the drum and an effective separation of liquid from said sludge (12).