Abstract: A staged filter apparatus (1) for mechanically separating solids from liquids flowing in channels, gutters or conduits, which has a multiplicity of stage screen bars (7′) connected to form a stationary grating (7), and a multiplicity of stage screen bars (6′) connected to form a movable grating (6), the gratings (6, 7) being arranged inclined in the direction of flow inside the flowing liquid starting from a level situated below the surface, and the stage screen bars (6′, 7′) being constructed in a stepped fashion in the direction facing the incoming flow, and in which the movable grating (6) can be actuated by means of a drive device (8) on a track. The stationary grating (7) being surrounded at least laterally by frame parts (3, 4), is distinguished in that all the drive elements (11, 12, 19; 13) of the movable grating (6) are essentially arranged in the common plane formed by the stationary grating (7) and the movable grating (6) in the zero position.

Abstract: A process and, respectively a device, for treating screenings from the mechanical cleaning stage of a sewage treatment plant is defined in that the screenings have electromagnetic waves in the frequency range between 1 GHz (gigahertz) and 1 THz (terahertz), so-called microwaves, applied to them for a predeterminable period.