Abstract: The invention relates to a vertical agitator for wastewater and the like received in a sedimentation tank, wherein an agitator tool (5) is mounted on a drive shaft (4) extending vertically from a drive (1) mounted above a tank floor (2), wherein a free end (E2) of a shaft section (7) extending from the agitator tool (5) in the direction of the tank floor (2) is held in a safety bearing (14), wherein the safety bearing (14) is held in a retaining device (8) supported on the tank floor (2), wherein the retaining device (8) comprises a receiving section (9) for a receiving device (12) receiving the safety bearing (14). In order to simplify installation, the invention proposes that the receiving section (9) comprises a recess (11) opening in a substantially horizontal direction for laterally inserting the shaft section (7).

Abstract: A device for decanting a supernatant includes a decanter which is pivotally attached to a clarifier and which includes a decanter head that has a water inlet opening, a pivoting device which is connected to the decanter via an actuator with an adjustable length for raising and lowering the water inlet opening relative to a floor of the clarifier, a first measuring device for measuring a fill level of the wastewater received in the clarifier, a device for determining a length of the actuator, an evaluating device with which a distance of the water inlet opening of the decanter to the floor of the clarifier can be determined from the length of the actuator, and a controller for controlling the pivoting device such that a water inlet opening immersion depth, which results from the difference between the fill level and the distance, is kept in a specified range.

Abstract: The invention relates to a horizontal agitator for producing a flow in a clarifier, a propeller being connected to a submersible motor which is axially offset in relation thereto, wherein the propeller and the submersible motor are designed such that a flow in a direction from the propeller towards the submersible motor is produced when the submersible motor is operated, and wherein plate-shaped flow guide elements are provided downstream of the propeller and extend in at least an axial plane that runs substantially parallel to the propeller axis. In order to improve the efficiency of the horizontal agitator, it is proposed in accordance with the invention to support the submersible motor on a bottom of the clarifier via at least two first flow guide elements.

Abstract: The invention relates to a horizontal agitator for producing a flow in a clarifier, a submersible motor and a propeller drivingly connected thereto forming an assembly unit, wherein a receiving portion for removably attaching the assembly unit is provided and can be supported on the bottom of the clarifier, and wherein a guide for guiding the assembly unit along a substantially vertical movement path between a surfacing position above a maximum nominal sewage level defined for the clarifier and the receiving portion is provided. In order to improve the efficiency of the horizontal agitator and to reduce complexity of manufacture, the guide is formed by at least one first cable extending between the surfacing position and the receiving portion.

Abstract: The invention relates to an arrangement for producing a flow in a wastewater treatment tank (1), comprising a substantially horizontal bottom (B) and a horizontal mixer (2, 3, 4), which is provided in the wastewater treatment tank (1) and which has a propeller (4) driven by means of a propeller shaft (3). According to the invention, in order to save energy to produce flows, the axis (A) of the propeller shaft (3) is tilted relative to the bottom (B) by an angle ? of 1 to 10° in such a way that a flow directed toward a surface (O) of the wastewater (W) can be produced by the horizontal mixer (2, 3, 4).

Abstract: The invention relates to a horizontal agitator for producing a substantially horizontal flow in a wastewater treatment tank, a propeller being installed on a polygonal shaft driven by means of a submersible motor, wherein the propeller is produced form a first material, which is formed from a polymer reinforced with first fibres, and as hub has a sleeve which corresponds to the outer shape of the polygonal shaft and which is produced from a second material which is different from the first material.

Abstract: The invention relates to a device for aerating a suspension held in a treatment tank, in particular wastewater, activated sludge and the like, with a frame having longitudinal spars (1) and a compressed-air diffuser (3), the housing (G) of which has a multiplicity of first connecting pieces (4) for the connection of air diffuser lines (5) and a second connecting piece (6) for the connection of an air feed line, wherein the housing (G) is fastened to the frame such that first axes of the first connecting pieces (4) run approximately parallel to a plane containing the longitudinal spars (1). To simplify assembly, it is proposed that a second axis of the second connecting piece (6) forms an angle of 30 to 60° with the plane.

Abstract: The invention relates to a decanter (2) for separating a supernatant arranged above a sludge in a settlement tank (1), wherein a withdrawal device (5, 16) with a receiving pipe (9, 18), which extends in the manner of a T-piece approximately perpendicular to a discharge pipe (4, 17), is attached to one end of the discharge pipe (4, 17). To reduce the production cost, it is proposed in accordance with the invention for the receiving pipe (9, 18) to be a polygonal pipe produced from sheet metal.

Abstract: The invention relates to a stirring device for activated sludges comprising a hyperboloid stirring body (2) attached to a shaft (1), wherein a plurality of transport ribs (3) are provided on the top (O) of the stirring body (2) running toward the circumferential boundary (UM) thereof, wherein the transport ribs (3) have an oblique course, at least in sections, relative to a radial direction, and wherein an oblique position of the transport ribs (3) is selected such that, when the stirring body (2) rotates in a predetermined rotational direction (R), a flow is generated that is directed radially outward away from the circumferential boundary (UM) of the stirring body (2). In order to improve the efficiency of the stirring device, the invention proposes that at least one propeller (6) be attached to the shaft (1) that, when the stirring body (2) rotates in the rotational direction (R), generates a flow (A) directed toward the top (O) of the stirring body (2).

Abstract: The invention relates to a drive device for the immersed operation below a surface of a liquid (F), particularly for the immersed operation in a clearing basin, having a drive shaft (5) guided out of a housing, wherein the drive shaft (5) is guided through an axial face seal (12, 13) received in a sealing chamber (10) for sealing the housing against penetrating liquid. In order to improve the service life of the seal, the invention provides that a line (22) is connected to the sealing chamber (10) for receiving an oil supply and is guided to above the surface of the liquid (F).

Abstract: A stirring device for activated sludges contained in a basin includes a stirring body having a hyperboloidal wall with a lower circumferential surface, and a funnel-shaped recess underside the hyperboloidal wall; a shaft attached to the stirring body; an air supply line adapted to extend along a bottom of the basin and having a vertical section to supply air into the recess of the stirring body; a disk arranged underside the stirring body and spaced away from the lower circumferential surface to form an annular gap therewith; and shear ribs formed under the lower circumferential surface to extend along the lower circumferential surface and surround the annular gap. The vertical section of the air supply line extends coaxially through the disk in relation to the shaft so that when the stirring body is rotating, the shear ribs distribute air bubbles through the annular gap.

Abstract: The invention relates to a device for gassing liquids, in particular for aerating sewage and the like, comprising a lower housing element (1), which has a substantially round opening area and a gas inlet port (24), a disc-shaped upper housing element (10), corresponding to the opening area, for covering the opening area, the upper housing element (10) having an upper side (O) facing away from the lower housing element (1), and a number of gas through-openings (13) being provided in the vicinity of a peripheral edge of the upper housing element (10), passing through the upper side (O), and a perforated gassing membrane (19), covering over the upper side (O) of the upper housing element (10).

Abstract: The invention relates to a horizontal agitator for producing a flow in a clearing basin, wherein a propeller (2) comprising a plurality of blades (4) is connected to a submersible motor (1) disposed axially thereto. In order to increase the efficiency of the horizontal agitator, according to the invention plate-shaped flow conducting elements (8) extending in at least one axial plane are provided downstream of the propeller (2).

Abstract: The invention relates to a device for aerating a suspension held in a treatment tank, in particular wastewater, activated sludge and the like, with a frame having longitudinal spars (1) and a compressed-air diffuser (3), the housing (G) of which has a multiplicity of first connecting pieces (4) for the connection of air diffuser lines (5) and a second connecting piece (6) for the connection of an air feed line, wherein the housing (G) is fastened to the frame such that first axes of the first connecting pieces (4) run approximately parallel to a plane containing the longitudinal spars (1). To simplify assembly, it is proposed that a second axis of the second connecting piece (6) forms an angle of 30 to 60° with the plane.

Abstract: The invention relates to a vertical agitator for wastewater and the like received in a sedimentation tank, wherein an agitator tool (5) is mounted on a drive shaft (4) extending vertically from a drive (1) mounted above a tank floor (2), wherein a free end (E2) of a shaft section (7) extending from the agitator tool (5) in the direction of the tank floor (2) is held in a safety bearing (14), wherein the safety bearing (14) is held in a retaining device (8) supported on the tank floor (2), wherein the retaining device (8) comprises a receiving section (9) for a receiving device (12) receiving the safety bearing (14). In order to simplify installation, the invention proposes that the receiving section (9) comprises a recess (11) opening in a substantially horizontal direction for laterally inserting the shaft section (7).

Abstract: The invention relates to a method for biologically cleaning wastewater (A), comprising the following steps: providing a treatment basin (B) having a floor (1) and at least one wall (2) extending from the floor at a wall height (W), having an inlet opening (3) and having at least one outflow opening (9) in the range from 0 to a maximum of 0.5 times the wall height (W), feeding the wastewater (A) through the inlet opening (3) into the treatment basin (B), bringing the wastewater (A) into contact with microorganisms seeded in loose growth bodies (12) received in the treatment basin (B), and discharging the wastewater (A) at least partially cleaned by the action of the microorganisms from the treatment basin (B) through the outflow opening (9), wherein the growth bodies (12) are retained in the treatment basin (B).

Abstract: The invention relates to a device for cleaning wastewater, wherein at least one flow channel (S, S1, S2) having at least one horizontal agitator (5) disposed therein in the treatment basin (B), and wherein a cross-sectional surface (Q) of the flow channel (S, S1, S2) extending perpendicularly to the flow direction (SR) increases steadily upstream and downstream from the horizontal agitator (5).

Abstract: The invention relates to a horizontal agitator for producing a flow in a clearing basin, wherein a propeller (2) having a plurality of blades (4) is connected to a submersible motor (1) axially disposed thereto. In order to increase the efficiency of the horizontal agitator, according to the invention the propeller (2) and the submersible motor (1) are configured such that during operation of the submersible motor (1) a flow (P2) that is directed from the propeller (2) to the submersible motor (1) is produced.