Abstract: An underwater clearing device for round sewage treatment basins having an approximately radially extending clearing device formed as a rake blade (8) that is revolvingly driven and sweeps along the bottom (2) of the round sewage treatment basin. The drive of the rake blade (8) being coupled to the rake blade (8) radially on the outside or radially on the inside via a toothed ring (11) provided solely for the revolving movement of the rake blade (8). The rake blade (8) and frame (10) forming a unit arranged under water. A driven transverse conveyor (31) may be provided instead of rake blade.

Abstract: A device for cleaning large quantities of water (3) of rakings at overflow edges (2), especially from rain water reservoirs, rivers, etc., with a stationary separation area (10), which is formed as a section of a cylinder jacket (7) with an axis (8) parallel to the overflow edge, through which the quantity of water flows is provided. A takeover device (11), which is driven about an axis (8) of the cylinder jacket (7), is assigned to the separation area (10) for removing the rakings separated at the separation area (10).

Abstract: A long sand trap for separating and removing sand from inflow channels, particularly of sewage treatment plants is provided with a settling channel (1) having in particular a trapezoidal cross-section and extending along a straight path. A transporting conveyor device (8) which is acting opposite to the direction of flow is provided in the bottom area (6). A classifying conveyor device (10) discharges the sand delivered from the transporting conveyor device (8) in an upwardly inclined manner. The classifying conveyor device (10) is arranged in the central longitudinal plane (3) of the settling channel (1). It has a discharge chute (17) which can be used selectively left-hand or right-hand.

Abstract: An apparatus for compressing and washing contaminated raked-off or screened material, particularly in sewage treatment plants, having a screw conveyor device with horizontal shafts (2, 3). There is a washing zone (33) with washer nozzles (34, 38) and compacting zones (21, 47) arranged before and after the washing zone. The washing zone (33) is divided into two sections (31, 32) adjacent to each other, in each of which a defined water level (35), occupying approx. 1/4 to 1/3 of the height of the cross-section of the housing (1), is present. In the first section (31) of the washing zone (33), the washer nozzles (34, 36) are arranged both above and below the water level (35). In the second section (32) of the washing zone (33), the housing for the screw conveyor device is provided with openings (40) arranged laterally to define the water level.

Abstract: A continuously and automatically functioning device for the drainage of sludge treated with a flocculent, especially of sewage sludge, comprising a screw conveyor installation with a driven conveyor screw consisting of shaft (16) and helix (17) and a screen wall (18). The screw conveyor installation possesses a first cylindrical area (10) of a large diameter and gap width followed by a conical area (12) for purposes of volume reduction in the throughput direction of the sludge. Connected to the conical area (12) of the screw conveyor installation is at least one pressure area (13) which, with the diameter of the shaft (16) being constant, possesses a decreasing lead of the conveyor helix (17) at the side of the entrance, and in its final area carries a conical piece (49) placed upon the shaft (16).

Abstract: The invention relates to a device for the removal of particles and/or screenings from a liquid running in a laundry. A screen with openings in the shape of a cylinder jacket reaches into the laundry and is tilted upwards. The screen is partly immersed in the liquid, and parallel haulage track for the material is provided. The track is located spaced from the screen, and has the form of a screw conveyor with a housing, a shaft and a conveyor helix. The conveyor helix moves alongside the screen and picks up the material and transports it upwards. The openings with their lengthwise direction are inclined relative to the axis of the cylindrical jacket-shaped screen so that they are situated approximately parallel to the effective direction of the total force exerted on the material by the conveyor helix.

Abstract: A device for removing material screened or filtered out of a liquid flowing in a channel. It consists of an unpowered cylindrical grating that merges into a screw-type conveyor. The grating slants down, partly immersed in the liquid, to the bottom of the channel. The bars of the grating extend over its total length leaving longitudinal interstices between them. The upward-sloping conveyor comprises a housing, a shaft, and a worm and conveys the screened-out material to a depositing point. The worm picks up the screened-out material as it scrapes the bars of the grating and conveys the material upward, constantly keeping the grating clean. The grating bars (8) are more or less triangular or trapezoidal in cross-section, with rounded-off edges, and positioned in such a way that one side (25) of the triangular or trapezoidal cross-section is oriented tangential to the circumference of the conveyor worm (16).

Abstract: A device for removing screened or sifted material from liquid flowing in a gutter (1) has a sloping cylindrical grizzly (11) that is mounted in the gutter, that is partly immersed in the liquid, and that has a face that is open upstream and closed downstream. The device also has a conveyor (5) that is positioned coaxial to the grizzly, that leads to an ejection point (18) outside of the liquid, and that has a powered shaft (7) and a housing (6). The conveyor has an intake funnel (9) for the screened or sifted material in the vicinity of the grizzly. The device also has a separator (15) for the screened or sifted material positioned above the intake funnel. The grizzly (11) is rotated. The separator (15) is positioned stationary on the outside of the grizzly (11) and releases screened or sifted material that adheres to the inside of the grizzly.