Filtrate separating device with flexible deformable liquid and gas impermeable wall

Filtrate separating device comprising a pair of walls defining a receiving space for sludge to be filtered, a frame connecting and sealing said walls, at least one filter mat placed on a respective wall in the receiving space with a filtrate space being disposed therebetween, a sludge intake connected to said receiving space and a filtrate drain connected to the filtrate space between each wall and filter mat;

• wherein said walls are displaceable away from each other for the removal of a dry filter cake, freed from filtrate by opening of the frame;
• wherein at least one of the walls is formed of a flexibly deformable liquid and gas impermeable material;
• wherein spacers are located between each wall and filter mat in a manner enabling them to follow movements of the respective wall and filter mat;
• wherein said frame comprises a respective rigid frame part connected to each wall, with the frame parts being connected to one another in a sealing manner by a sealing arrangement;
• and wherein the filtrate drain is at least indirectly connected to a vacuum pump in a manner enabling a partial vacuum to be drawn in each filtrate space.