Abstract: A bottom seal, at the lower end of a step screen, is adapted to convey solid particles and other objects positioned in flowing water. The step screen has a grating including alternately fixed and movable lamellar rods with intermediate gaps to allow the water to pass through the grating. The bottom seal extends substantially across the entire width of the grating to seal the ducts that arise between the fixed lamellar rods at their lowermost step as the movable lamellar rods move upwards between the fixed lamellar rods. The bottom seal includes an elongate bottom cover, which at its longitudinal edge upstream is, via hinges, pivotally connected to the step screen via a bottom step upstream of the bottom cover.

Abstract: The invention relates to a grit washer for separating organic pollutants from grit in wastewater treatment plants, said device comprising a container (2) which has a material supply inlet (5), a grit outlet (7), a separating water inlet (6) and a liquid discharging means (10). The container (2) has a vibrating means (8) arranged inside the container (2) in order to separate, while vibrating in cooperation with the supplied separating water, the grit from organic matter. The invention also relates to a device for separating solid matter in flowing liquids in wastewater treatment plants, the device comprising a screening unit (30) which is arrangeable in a duct with flowing liquid, the screening unit (30) having movably arranged discharging means (39) which feed the solid matter up to an unloading portion (35) having a vibrating means (46) which releases the solid matter from the unloading portion (35).

Abstract: A bottom seal, at the lower end of a step screen, is adapted to convey solid particles and other objects positioned in flowing water. The step screen has a grating including alternately fixed and movable lamellar rods with intermediate gaps to allow the water to pass through the grating. The bottom seal extends substantially across the entire width of the grating to seal the ducts that arise between the fixed lamellar rods at their lowermost step as the movable lamellar rods move upwards between the fixed lamellar rods. The bottom seal includes an elongate bottom cover, which at its longitudinal edge upstream is, via hinges, pivotally connected to the step screen via a bottom step upstream of the bottom cover.

Abstract: A separating grid (1) for collection and removal of solid particles and objects (4) from running water (2) in a channel (2). The separating grid (1) comprises a stand (9) including a separating unit (10) formed by separating grid bars (11, 12) positioned side by side in such a manner that fixed grid bars (11) alternate with mobile grid bars (12), said grid bars formed with collection and removal means (13). The fixed grid bars (11) are securely attached to the stand whereas the mobile grid bars (12) are connected at their upper ends (17) to a drive unit (18) and at their lower ends (16) they are arranged for controlled movement in the stand. The drive unit imparts to the mobile grid bars a movement which at the upper end of the bars follows a closed path but in a direction towards their lower ends follows successively and increasingly flattened, elliptical paths changing at the lower ends into an essentially rectilinear to-and-fro movement path.