Abstract: The sludge filtration device comprises: a filter (1) placed over an approximately horizontal box (4), this filter (1) constituting, in its filtration position, the bottom of a filter chamber (8) of essentially vertical axis; a piston (10) suitable for closing the filter chamber in the top part; means (3, 11) for causing relative movement between the box (4) provided with the filter (1) and the piston (10) so that a liquid filtrate flows downwards through the filter (1) and so that a cake of solid matter remains on the filter (1) at the end of the operation; and a scraper device (31) provided for removing this cake. The piston is made in the form of a filter piston (10) so that a liquid effluent passes through the filter piston (10) as the volume of the filter chamber (8) is being decreased, and a suction pumping means (P) is provided for removing the effluent above the filter piston (10).

Abstract: An apparatus and a method using the apparatus are described for the separation by filtration of a solid phase and a liquid phase from a sludge. A pressure is exerted on the sludge with the aid of a piston in a filtration chamber having a filter. The filter is extracted from the chamber and the surface of the filter is swept using a scraper device. The invention can be used for the treatment of liquid manure.