Sedimentation device

Abstract

The invention relates to a sedimentation device for material contained in liquid, in particular precipitation water, comprising a sedimentation insert (12) which has a vertical axis (26) and which, in the position of use, is inserted in a shaft element (13), the sedimentation insert (12) having an inlet chamber (18) which is delimited by an inlet-chamber side wall (20) equipped with at least one lateral inlet opening (19) and which has an exit opening (23) at the bottom of the inlet chamber, and the sedimentation insert (12) having an outlet chamber (28) which adjoins the inlet chamber (18) and which is delimited in such a way by an outlet-chamber side wall equipped with at least one lateral outlet opening (24) that a liquid flow generated in a through-flow direction (25) from the inlet opening (19) to the discharge opening (24) exits at the discharge opening (24). According to the invention, the inlet chamber (18) is assigned a surface deposition device (39) for the deposition of contaminants floating in the region of the liquid surface of the liquid flowing into the inlet chamber (18).

Description

[0001]

[0002] June 17, 2025

[0003] 3P Technik Filtersysteme GmbH, Robert-Bosch-Straße 16 - 18, 73337 Bad Überkingen

[0004] Sedimentation facility

[0005] The invention relates to a sedimentation device for material contained in liquid, in particular rainwater, with a sedimentation insert having a vertical axis, which in the operating position is inserted into a shaft element, wherein the sedimentation insert has an inlet chamber which is bounded by an inlet chamber side wall equipped with at least one lateral inlet opening and has an outlet opening on its underside, and wherein the sedimentation insert has an outlet chamber adjacent to the inlet chamber which is bounded by an outlet chamber side wall equipped with at least one lateral outlet opening such that a liquid flow generated in a flow direction from the inlet opening to the outlet opening exits at the outlet opening.

[0006] A sedimentation device of the type mentioned above is described, for example, in DE 10 2019 203 116 A1. The sedimentation insert disclosed therein has an inlet chamber which is bounded by an inlet chamber side wall equipped with a lateral inlet opening and has an outlet opening on its underside, with a flow breaker device associated with the outlet opening.

[0007] P 35687 / PCT

[0008] June 17, 2025 is the date. The sedimentation unit further features an outlet chamber surrounding the inlet chamber in a ring-shaped configuration. This outlet chamber is bounded by an inner outlet chamber side wall, a bottom, and an outer outlet chamber side wall, with the outlet opening being formed at the boundaries of the outlet chamber. The outer outlet chamber side wall forms a weir, for example, a toothed weir.

[0009] Sedimentation systems of the type described are primarily used to separate dirt, dust, debris, etc., washed up during rainfall events. It is also essential to ensure that washed-up objects, such as branches, aluminum cans, plastic parts, or similar items, are retained. In particular, rainwater retention systems that fill up during heavy rainfall require the discharge of the accumulated rainwater. Discharging the accumulated rainwater directly into the sewer system or for infiltration without the intermediate use of a sedimentation system is problematic.

[0010] Another problem with precipitation events is floating contaminants, i.e., contaminants that largely remain on the surface of the liquid, especially rainwater, and therefore cannot be separated by sedimentation using conventional sedimentation facilities.

[0011] The task of the invention is therefore to create a sedimentation facility of the type mentioned at the beginning, which is more versatile than conventional sedimentation facilities, in particular reducing the problem of floating impurities described above.

[0012] P 35687 / PCT

[0013] June 17, 2025. This problem is solved by a sedimentation device with the features of independent claim 1. Further developments of the invention are presented in the dependent claims.

[0014] The sedimentation device according to the invention is characterized in that a surface separation device for separating floating impurities in the area of ​​the liquid surface of the liquid flowing into the inlet chamber is assigned to the inlet chamber.

[0015] Floating contaminants include solids, such as microplastic particles, but also liquid contaminants that are carried along the surface due to their lower density compared to the carrier fluid. The liquid in question is primarily rainwater. A typical example of a floating liquid contaminant is oil or grease washed onto the water's surface.

[0016] With the help of the surface separation device, it is therefore possible to remove not only settling suspended solids by means of sedimentation, but also those on floating contaminants.

[0017] The idea is therefore to equip a sedimentation facility, which primarily represents a deep separator, with a surface separator, thus combining deep separation and surface separation in one facility.

[0018] In a further development of the invention, the surface separation device includes a skimmer.

[0019] P 35687 / PCT

[0020] June 17, 2025 In a particularly preferred configuration, the skimmer is designed as an overflow skimmer, with at least one overflow opening, especially on the inlet chamber side wall, for discharging floating contaminants. Advantageously, the overflow skimmer is designed as a weir skimmer.

[0021] In a further development of the invention, the surface separation device includes at least one retention cell with a cell height axis for retaining the contaminants. The retention cell is expediently designed as a retention tank. The retention cell is expediently a component designed separately from the sedimentation insert.

[0022] The sedimentation insert is preferably made of a plastic component. The retention cell, particularly in the form of a retention tank, is also advantageously made of a plastic component.

[0023] In a further development of the invention, the overflow pipe enters the retention cell via an inlet opening. Advantageously, the overflow pipe is designed as an overflow tube, which is connected on one side to the overflow opening at the inlet chamber and on the other side to the inlet opening at the retention cell.

[0024] In a particularly preferred configuration, the retention cell is connected to the discharge chamber via a return flow arrangement. The partial flow discharged from the inlet chamber can thus be largely returned to the sedimentation unit via the return flow arrangement, thereby preventing the retention cell from filling up.

[0025] P 35687 / PCT

[0026] June 17, 2025 Particularly preferably, the return arrangement comprises a dip tube arranged in the retention cell, in particular aligned along the cell's vertical axis, with a dip tube inlet opening pointing towards the bottom of the retention cell. Advantageously, the return arrangement also comprises a return pipe, which is connected to the dip tube on one side and to the discharge chamber on the other, in particular via a return opening opening that opens onto the side wall of the discharge chamber.

[0027] In a particularly preferred configuration, the immersion tube inlet opening is located in the region of the cell bottom. Advantageously, the opening cross-section of the immersion tube widens towards the immersion tube inlet opening.

[0028] In a particularly preferred embodiment, the inlet opening has an inlet edge and the outlet opening has an outlet edge, wherein a height difference forming a gradient in the flow direction is formed between the inlet edge and the outlet edge. The height difference ensures a continuous fluid flow from the sedimentation insert into the retention cell and back.

[0029] The arrangement of the immersion tube inlet opening significantly below the liquid level at the return opening, i.e., particularly in the area of ​​the cell bottom, ensures that there is no return of the floating impurities, which would largely accumulate on the liquid surface in the retention cell.

[0030] In a further development of the invention, the overflow openings have an overflow edge and the return opening a return-

[0031] P 35687 / PCT

[0032] June 17, 2025, running edge on, wherein a height offset forming a gradient in the direction of flow is formed between the overflow edge and the return edge.

[0033] In a further development of the invention, the inlet chamber features a circulation section in which the incoming liquid is set into a circulating flow by means of initial flow guides. This circulating flow, which can also be described as tangential flow or vortex flow, causes a lengthening of the settling time of sedimenting or sinking suspended solids, as they are forced onto a spiral path due to the circulating flow.

[0034] In a further development of the invention, the first flow guide elements have a flow-guiding element arranged downstream of the inlet opening in the direction of flow, which is expediently designed as a deflector plate. This makes it possible to arrange the inlet opening on the inlet chamber in such a way that the incoming fluid flows radially in and is directed by the flow-guiding element towards the wall of the inlet chamber, thereby generating the circulating flow.

[0035] Alternatively, it would also be conceivable to arrange the inlet opening in such a way that the incoming liquid already flows in tangentially by means of the orientation of the inlet opening and is directed towards the wall of the inlet chamber.

[0036] In a further development of the invention, a flow breaker device for breaking the liquid flow, especially circulation flow, is assigned to the outflow opening of the inlet chamber. This prevents,

[0037] P 35687 / PCT

[0038] June 17, 2025, that in the sedimentation chamber located below the outflow opening of the sedimentation insert, already settled sediment is stirred up.

[0039] In a further development of the invention, the inlet opening on the cell wall of the retention cell is connected to a second flow guide for directing the flow into the area of ​​the inner wall of the retention cell. Preferably, the second flow guide has a deflector plate. In contrast to the first flow guide, the second flow guide ensures a calming of the flow in the retention cell, thereby preventing unintentional sinking of floating contaminants due to turbulence.

[0040] In a further development of the invention, the outlet chamber side wall is designed as a weir, preferably a weir, in particular a toothed weir.

[0041] A preferred embodiment of the invention is shown in the drawing and is explained in more detail below.

[0042] The drawing shows:

[0043] Figure 1 shows a side view of a preferred embodiment of the inventive sedimentation device and

[0044] Figure 2 shows a top view of the sedimentation facility of Figure 1.

[0045] Figures 1 and 2 show a preferred embodiment of the inventive sedimentation device 11. The sedimentation device 11 is described below by way of example.

[0046] P 35687 / PCT

[0047] The use of the sedimentation device 11 for separating material contained in rainwater, especially sediments in the form of dirt particles, was described on June 17, 2025. In principle, it would be possible to treat liquids other than water with the sedimentation device 11; however, its main application is the treatment of rainwater, especially rainwater. Furthermore, the sedimentation device is suitable for separating floating contaminants, for example, floating particles such as microplastic particles, but also liquid contaminants such as oil, grease, or the like.

[0048] In the described example, the sedimentation unit 11 can be located upstream or downstream of a stormwater retention basin, or within the stormwater retention basin itself, so that rainwater accumulated in the retention basin can be discharged via the sedimentation unit. According to the legal regulations governing separation of stormwater and water, the untreated discharge of accumulated stormwater, for example from a stormwater retention basin, into the sewer system, into a body of water, or for infiltration is no longer permitted, thus necessitating the treatment of such accumulated stormwater.

[0049] However, the use of the inventive sedimentation facility 11 is not linked to a rainwater retention basin, but the sedimentation facility 11 can be used wherever rainwater is discharged into the sewer system, into a body of water or for infiltration.

[0050] As shown in Figures 1 and 2, the sedimentation device 11 has a sedimentation insert which, in its operating position, is inserted into a shaft element 13 (in dashed lines). The example shown in Figure 1

[0051] P 35687 / PCT

[0052] June 17, 2025. The shaft element 13 is generally made of concrete and is buried in the ground. The shaft element 13 has a shaft casing 14, which is open at the top and closed at the bottom by a shaft base 15. The lower part of the shaft element 13 and the shaft base 15 together form a sump or sediment collection chamber. The shaft casing 14 is expediently cylindrical.

[0053] Because the shaft element 13 is open at the top, the sedimentation insert 12 can be easily inserted into the shaft element 13 from above. As shown particularly in Figure 1, the shaft element 13 has a shaft inlet opening (not shown) on the shaft shell 14 and a shaft outlet opening (not shown) arranged diametrically opposite to a longitudinal axis of the shaft element on the shaft shell 14.

[0054] In contrast to the shaft element 13, the sedimentation insert 12 is expediently a plastic component. The sedimentation insert 12 can, for example, be manufactured using plastic rotary molds.

[0055] The sedimentation insert 12 has an inlet chamber 18, which is bounded by an inlet chamber side wall 20 equipped with a lateral inlet opening 19. The inlet opening 19 is oriented such that incoming water flows radially inwards.

[0056] The inlet opening 19 of the inlet chamber 18 is connected to the shaft inlet opening via an inlet pipe 21, preferably the inlet pipe 21 extending beyond the outside of the shaft shell 14.

[0057] P 35687 / PCT

[0058] June 17, 2025. The inlet chamber 18 has an inlet section 22 associated with the inlet opening 19, which can also be referred to as a circulation section. The inlet section 22 is bounded by a cylindrical part of the inlet chamber side wall 20.

[0059] The inlet chamber 18 has an outlet opening 23 on its underside, wherein the outlet opening 23 is associated with a flow-breaking device for breaking the flow of a liquid flow generated between the inlet opening 19 and an outlet opening 24 in a flow direction 25.

[0060] The inlet chamber 18 has an outlet section 27 downstream of the inlet section 22 of the inlet chamber 18 in the flow direction 25, and which is associated with the outlet opening 23. In this example, the outlet section 27 is funnel-shaped. The outlet section 27 expediently forms a hydrodynamic shut-off. The outlet opening 23 is located on the underside of the outlet section 27.

[0061] Downstream of the inlet opening 19 in the flow direction 25, first flow guides are arranged in the inlet chamber 18 such that incoming water is set into a tangential flow. The first flow guides have a flow-guiding element (not shown) in the form of a deflector. The deflector can, for example, be designed as an angled profile, which is expediently integrally connected to the inlet chamber side wall 20. The deflector can also have a vertical leg that extends in the vertical direction of the inlet chamber and is inclined relative to the outlet surface of the inlet opening 19, such that incoming water rebounds from the inner wall of the vertical leg, which serves as a guide surface, and flows in the direction of

[0062] P 35687 / PCT

[0063] June 17, 2025, inner wall of the inlet chamber side wall 20, where a circulation flow or tangential flow is then generated. The vertical leg can be integrally connected to a horizontal leg, which is connected at an angle to the vertical leg and is also integrally connected to the inlet chamber side wall.

[0064] As shown particularly in Figure 1, the sedimentation insert 12 has an outlet chamber 28 that surrounds the inlet chamber 18 in an annular manner and is bounded by an inner outlet chamber side wall 29 and an outer outlet chamber side wall 30. Advantageously, in this example, the inner outlet chamber side wall is formed by the inlet chamber side wall 20. The outlet chamber also has a bottom, which can, for example, be integrally connected to the inlet chamber side wall 20. The same applies to the outer outlet chamber side wall 30. As shown particularly in Figures 1 and 2, the outlet opening 24 is located at the boundary of the outlet chamber 28, in particular at the outer outlet chamber side wall 30.

[0065] The outlet opening 24 can be height-adjustable. This height adjustability can be achieved by making the outlet opening 24 part of a slide (not shown) which is mounted in a height-adjustable manner on a slide guide (not shown) on the outer outlet chamber side wall 30.

[0066] As shown particularly in Figures 1 and 2, the outlet opening 24 is connected to the shaft drain opening 17 via an outlet pipe 31. The height adjustability of the outlet opening 24, in particular by means of the slide valve, serves to compensate for a height difference between the outlet opening 24 and the shaft drain opening 17.

[0067] P 35687 / PCT

[0068] June 17, 2025 As shown particularly in Figure 1, the outer outlet chamber side wall 30 is designed as a weir 32. In this example, the weir 32 is designed as a dam, expediently as a toothed dam. The toothed dam has a row of teeth 33 forming the upper edge of the outer outlet chamber side wall, with a plurality of teeth 34 arranged circumferentially, in particular at uniform intervals from one another. The teeth 34, which can also be referred to as teeth, have the shape of isosceles triangles in this example. Thus, triangular overflow cross-sections 35, in particular having the shape of isosceles triangles, are formed between each adjacent tooth 34. The triangular overflow cross-sections 35 allow a uniform overflow of water that flows from the outside, overflowing the toothed dam, into the outlet chamber 28.As already mentioned, the flow breaker device is assigned to the outlet opening 23 of the inlet chamber 20 and serves to break the turbulent tangential flow or circulation flow in the inlet chamber 20. This is intended to prevent material settled on the shaft floor 15 from being stirred up again. The flow breaker device has several flow breaker elements 36a-c positioned transversely to the flow direction, which are located downstream of the outlet opening 23 in the flow direction 25, i.e., below the inlet chamber 18.

[0069] The flow-breaking elements 36a-c are sword-shaped in this example and are expediently shown as three plate-like flow-breaking elements 36a-c arranged at regular intervals in a star shape. The flow-breaking elements 36a-c are integrally connected and together form a support frame 37 for the inlet and outlet chamber located above it.

[0070] P 35687 / PCT

[0071] June 17, 2025 18, 28. Height-adjustable feet can be found on the underside of the stand 37, making it possible to adjust the installation position of the sedimentation insert 12.

[0072] The flow-breaking device also has a grid, which in the example shown is arranged slightly below the outlet opening 23. The grid also serves to break up the turbulent tangential or circulating flow in the inlet chamber 18.

[0073] An essential element of the sedimentation device 11 is a surface separation device 39 assigned to the inlet chamber for separating floating impurities from the liquid surface, in particular water surface, of the liquid, in particular water, flowing into the inlet chamber 18.

[0074] With the inventive sedimentation device, it is therefore possible to carry out both deep sedimentation and surface sedimentation.

[0075] The surface separation device 39 has a skimmer in the form of an overflow skimmer 40. In this example, the overflow skimmer 40 is designed as a weir skimmer and has an overflow opening 41 formed on the inlet chamber side wall 20 for discharging floating contaminants by means of a diverted partial flow of the liquid flowing into the inlet chamber 18.

[0076] The surface separation device 39 also has at least one retention cell 43 having a cell height axis 42 for retaining the floating contaminants.

[0077] P 35687 / PCT

[0078] June 17, 2025. The containment cell 43 is expediently designed as a containment tank. The containment tank is also expediently a plastic component.

[0079] The retention cell 43 is a component designed separately from the sedimentation insert, which is hydrologically connected to the sedimentation insert in a manner described in more detail below.

[0080] The retention cell has a cell wall 44 and a cell floor 45, which is expediently open towards the top.

[0081] As shown in particular in Figure 2, the overflow opening 41 arranged on the inlet chamber side wall 20 is connected to the retention cell 43 by means of an overflow line 46.

[0082] The overflow pipe 46 is designed as an overflow tube that extends essentially perpendicular to the vertical axis 26 of the sedimentation insert 12 and perpendicular to the vertical axis 42 of the cell, with a slight gradient towards the retention cell. The overflow tube has several distinct pipe sections, one of which has an overflow opening 41 at an inlet section 47.

[0083] As exemplified in Figure 2, the inlet section 47 can taper in a funnel shape towards the retention cell, thereby forming an overflow opening 41 with a relatively large cross-section on the inlet chamber side wall. A cylindrical transport section 48 adjoins the inlet section 47 in the direction of the retention cell 43 and penetrates the cell wall 44 of the retention cell 43. Finally, the overflow pipe terminates in the retention cell 43 by means of a terminal section 49, at which an inlet opening 50 is located.

[0084] P 35687 / PCT

[0085] 17 June 2025 is trained. Advantageously, the mouth section 49 has a curvature such that the inlet opening 50 points towards the cell wall 44.

[0086] As shown particularly in Figure 2, the inlet opening 50 on the cell wall 44 of the retention cell 43 is connected to a second flow guide 51 for the flow direction into the area of ​​the inner wall of the retention cell 53. In the example shown, the second flow guide has a deflector plate 52, which directs the water flowing out of the inlet opening into the area of ​​the inner wall of the cell wall 44.

[0087] The surface separation device 39 also has a return arrangement 52, which connects the retention cell 53 with the discharge chamber 28.

[0088] The return arrangement 52 has a dip tube 53 arranged in the retention cell 43, in particular aligned along the cell's vertical axis 42, which has a dip tube inlet opening 54 pointing towards the cell bottom 45. The return arrangement 52 also has a return pipe 55, which is connected on one side to the dip tube 53 and on the other side to the outlet chamber 28 via a return opening 56 that opens onto the outlet chamber side wall 30.

[0089] As shown particularly in Figure 1, the dip tube has a dip tube inlet section 57 at which the dip tube inlet opening 54 is located. The dip tube inlet section 57 has a significantly larger cross-section than the rest of the dip tube, meaning that the dip tube widens towards the dip tube inlet opening 54.

[0090] P 35687 / PCT

[0091] June 17, 2025. To ensure a flow from the inlet opening 19 via the overflow opening 41 into the retention cell 43 and via the return arrangement 52 back into the outlet chamber 58, this flow path is designed with a gradient. The inlet opening 19 has an inlet edge 58, while the outlet opening 24 has an outlet edge 59. Between the inlet edge 58 and the outlet edge 59, a vertical offset is formed, creating a gradient in the flow direction 25. This vertical offset is also formed between an overflow edge 60 of the overflow opening 41 and a return edge 61 of the return opening 56.

[0092] During operation, rainwater laden with sediment and floating contaminants flows into the inlet chamber 18 via the inlet pipe 21 and the inlet opening 19. The incoming rainwater encounters the flow-guiding element in the form of the deflector and is directed towards the inner wall of the inlet chamber 18. This creates a circulation or tangential flow, which ensures a relatively high velocity and thus a high throughput within the inlet chamber 18. Water flows downwards in the inlet chamber 18 and enters the funnel-shaped outlet chamber 32, where it then exits through the outlet opening 23 into the interior of the shaft element 13. The flow-breaking device with its plate-like flow-breaking elements ensures that the flow is calmed, i.e., it breaks the tangential flow. Sediments washed along with the water settle at the bottom of shaft 15.The star-shaped flow breaker elements prevent a tangential flow at the bottom of the shaft 15 .

[0093] The rainwater now rises inside the shaft element 13 and overflows the weir 38 in the form of the

[0094] P 35687 / PCT

[0095] June 17, 2025, Zackenwehrs. The overflowing rainwater is essentially free of the sediments that have settled at the bottom of shaft 15. The rainwater passes over the Zackenwehr into the discharge chamber 28, from where it can only drain through the outlet opening 24. The rainwater, thus cleaned, then drains through the outlet opening 24 and can from there be directed into the sewer system, a body of water, or into infiltration.

[0096] Simultaneously with the previously described deep sediment separation, surface separation of floating contaminants takes place by means of the surface separator device 39. Here, a partial flow of the water entering the inlet chamber flows out via the overflow opening 51, and the floating contaminants located on the surface are thereby carried away, i.e., diverted. This partial flow reaches the outlet section 49 via the overflow pipe, where it is transported by the second flow guide 51, in the form of a deflector plate, towards the inner wall of the cell wall of the retention cell 43, thus preventing rapid radial inflow and subsequent turbulence. The suspended impurities, such as suspended particles or liquid contaminants in the form of oil or grease, accumulate on the water surface in the retention tank.

[0097] To prevent the retention tank from filling up, a return arrangement 52 is provided, with a dip tube that extends relatively deep into the water body in the retention tank, so that it is essentially excluded that floating contaminants are returned via the dip tube inlet opening 54, since, as already mentioned, they adhere to the water surface or are carried away by any

[0098] P 35687 / PCT

[0099] June 17, 2025. Turbulences float a short distance below the water's surface, but not at the depth where the inlet opening 54 of the submerged tube is located. The backflowing water then enters the outlet chamber 28 via the return pipe, from where it flows out through the outlet opening 24, essentially free of floating impurities.

[0100] P 35687 / PCT

[0101] June 17, 2025

Claims

Claims 1. Sedimentation device for material contained in liquid, in particular rainwater, comprising a sedimentation insert (12) having a vertical axis (26), which in the operating position is inserted into a shaft element (13), wherein the sedimentation insert (12) has an inlet chamber (18) which is bounded by an inlet chamber side wall (20) equipped with at least one lateral inlet opening (19) and has an outlet opening (23) on its underside, and wherein the sedimentation insert (12) has an outlet chamber (28) adjoining the inlet chamber (18), which is bounded by an outlet chamber side wall equipped with at least one lateral outlet opening (24) such that a liquid flow generated in a flow direction (25) from the inlet opening (19) to the outlet opening (24) exits at the outlet opening (24), characterized in thatthat the inlet chamber (18) is assigned a surface separation device (39) for separating floating impurities in the area of ​​the liquid surface of the liquid flowing into the inlet chamber (18).

2. Sedimentation device according to claim 1, characterized in that the surface separation device (39) has a skimmer. P 35687 / PCT June 17, 2025 3. Sedimentation device according to claim 2, characterized in that the skimmer is designed as an overflow skimmer (40), with at least one overflow opening (41) formed in particular on the inlet chamber side wall (20) for the discharge of floating impurities by means of a diverted partial flow of the liquid flowing into the inlet chamber (18).

4. Sedimentation device according to one of the preceding claims, characterized in that the surface separation device (39) has at least one retention cell (43) having a cell height axis (42), in particular a retention tank, for retaining the floating impurities.

5. Sedimentation device according to one of claims 3 or 4, characterized in that the overflow opening (41) is connected to the retention cell (43) by means of an overflow line (46), in particular an overflow pipe.

6. Sedimentation device according to claim 5, characterized in that the overflow pipe (46) opens into the retention cell (43) by means of an inlet opening (50).

7. Sedimentation device according to one of claims 4 to 6, characterized in that the retention cell (43) is connected to the discharge chamber (28) via a return arrangement (52).

8. Sedimentation device according to claim 7, characterized in that the return arrangement (52) has a dip tube (53) arranged in the retention cell (43), in particular aligned along the cell's vertical axis (42), with a direction towards a cell bottom (45) of the P 35687 / PCT June 17, 2025 retention cell (43) with immersion tube inlet opening (54) and that the return arrangement (52) has a return pipe (55) which is connected on the one hand to the immersion tube (53) and on the other hand to a return opening (56) which opens in particular on the outlet chamber side wall (30) with the outlet chamber (28).

9. Sedimentation device according to claim 8, characterized in that the inlet opening (19) has an inlet edge (58) and the outlet opening (24) has an outlet edge (59), wherein a height offset forming a gradient in the direction of flow is formed between the inlet edge (58) and the outlet edge (59).

10. Sedimentation device according to one of claims 4 to 9, characterized in that the overflow opening (51) has an overflow edge (60) and the return opening (56) has a return edge (61), wherein a height offset forming a gradient in the flow direction (25) is formed between the overflow edge (60) and the return edge (61).

11. Sedimentation device according to one of the preceding claims, characterized in that the inlet chamber (18) has an inlet section (22) in which the inflowing fluid can be set into a circulating flow by means of first flow guides.

12. Sedimentation device according to claim 11, characterized in that the first flow guide means has a flow guide element, in particular a deflector plate, arranged in the flow direction after the inlet opening (19). P 35687 / PCT June 17, 2025 22 13. Sedimentation device according to one of the preceding claims, characterized in that a flow breaker device for breaking the flow of liquid, in particular circulation flow, is associated with the outlet opening (23) of the inlet chamber (18).

14. Sedimentation device according to one of claims 6 to 13, characterized in that the inlet opening (50) on the cell wall (44) of the retention cell (43) is associated with second flow guides (51) for the flow direction into the area of ​​the inner wall of the retention cell (43), wherein preferably the second flow guides (51) have a deflecting plate.

15. Sedimentation device according to one of the preceding claims, characterized in that the outlet chamber side wall (30) is designed as a weir (32), preferably a weir, in particular a toothed weir. P 35687 / PCT June 17, 2025

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