BigPatents India

Apparatus for solid-liquid gravity separation, particularly of sludge from purification stations comprising a planar, fixed thickening or draining grate (2), to which the sludge is continuously supplied, said sludge being permanently scraped by a scraping system having flexible blades (4), wherein said grate is constituted by a plurality of bars (6, 6"), whose gaps vary continuously over their lengths between the inlet (1) and the outlet (3) of the apparatus, the value of the gaps between the bars of the grate (2), together with their cross-section being chosen so as to obtain a percentage vacuum exceeding 30% and which may reach 50%,