<p>Rotary disc filter structure, of the type made up of a central drum bearing - on the outer surface - filter discs parallel to each other arranged coaxially transversal with respect to the drum and provided with a filter membrane on the two surfaces orthogonal to the axis, comprising a plurality of modules with annular section (3) made up of: pairs of radial elements (29) shaped with a radial development part (30) and a circumferential development part (31) consecutively associable in series with the adjacent circumferential parts (31) of the other radial elements (29) to form two annular surfaces 40 on the two opposite faces of the disc (1); circumferential elements (34) for closing the annular sections (3) arranged consecutively in series between each pair of radial elements (29); frameworks (37) for supporting the filter membrane (2) reproducing the perimeter of said annular sections (3) proximally constrained to said circumferential development parts (31) of said pairs of radial elements (29) and distally constrained to said circumferential elements (34) for closing said annular sections (3); side covers (49) of the radial development parts (30) of said pairs of radial elements (29) accommodating the radial sides of said frameworks (37) for supporting the filter membrane (2).</p>
