Device for treating wastewater

Abstract

Device for the treatment of sediment-laden wastewater, with - an elongated pelvis (1), - a water inlet (9) into the basin (1), - a water outlet (11) from the basin (1), - wherein the water inlet (9) and the water outlet (11) are arranged on opposite ends of the elongated basin (1), - a sludge collection chamber in the lower part of the basin (1), as well as - a plurality of flow guide means (16) which - form a multitude of parallel flow paths (17) between each other and - are arranged in several packages (15) arranged one behind the other in the main flow direction, each having a plurality of flow guiding means (16), which - individually around a horizontal axis (22) from a working position in which - the flow paths (17) of successively arranged packages (15) are aligned with each other and in a vertical longitudinal section the flow guide means (16) run horizontally, are arranged to be pivoted into a cleaning position in which - the flow guide means (16) run vertically.

Description

[0001] The invention relates to a device for treating sediment-contaminated wastewater.

[0002] Such a device is already known. It contains several modules made of parallel, flat sheets or profiles in an approximately rectangular basin, forming flow paths for the water between them. In an operating position, the sheets are inclined at an angle of approximately 30° to the vertical. From this operating position, the modules can be tilted into a vertical position. As the water flows through the spaces between the sheets, the sediment can settle on the sheets (DE 10 2010 003 633 A1). In the cleaning position, the sediment can flow downwards from the sheets into a collection chamber, from which it can then be removed.

[0003] Also known is a lamella clarifier in which the sheets forming flow paths between them are arranged horizontally in the working position and can be individually pivoted up into a vertical cleaning position (DE 20 2009 007 728 U1).

[0004] Also known is a filter system for wastewater in which a plurality of plates are arranged to form layered flow paths with a slight gradient (CH 703152 B1).

[0005] A device for treating wastewater from sediment is known from German patent application DE 10 2010 003 633 A1. The device provides a tank with an inlet below stacks of lamellar flow guides. An outlet is then arranged above the stacks. The stacks, which consist of inclined flow guide plates, with all plates arranged parallel to each other, are consequently flowed through from bottom to top and also at an angle.

[0006] A lamella clarifier is known from the German utility model DE 20 2009 007 728 U1. Horizontally arranged lamellae are arranged in a tank. The entire tank can be pivoted about a pivot axis. The tank is enclosed except for an inlet and an outlet. The lamellae can only be pivoted into a cleaning position together with the tank. An angle of approximately 65 degrees exists between a separation position, in which the lamellae are arranged horizontally, and a cleaning position.

[0007] Another device for treating sediment-laden wastewater is known from German patent application DE 10 2005 004 230 A1. The device comprises an elongated basin. Arranged within the basin is a stack of lamellae, through which the water flows diagonally from top to bottom. The lamellae can be pivoted from a separation position to a cleaning position.

[0008] Another device for treating sediment-laden wastewater is known from German patent DE 40 17 229 C2. The device comprises an elongated basin with a water inlet and a water outlet, the water inlet and the water outlet being arranged on opposite ends of the elongated basin. A sludge collection chamber is arranged in the lower region of the basin, and a plurality of flow guides are provided, which form a plurality of parallel flow paths between one another. The plurality of flow guides forms a single, fixed package.

[0009] The invention is based on the object of creating a device for treating sediment-laden wastewater which has an improved efficiency.

[0010] To achieve this object, the invention proposes a device having the features recited in claim 1. Further developments of the invention are the subject of subclaims.

[0011] The basin in which the flow guides are arranged is usually cuboid-shaped. The inlet and outlet are located at opposite ends of the elongated basin. Due to the cuboid shape of the basin, the space can be effectively utilized by rectangular packages or modules of flow guides. The horizontal arrangement of the flow guides provides ample space for the sediment to settle. The sediment remains on the flow guides, preventing it from being mixed back into the incoming water. To clean the flow guides, they are pivoted into a vertical position so that the sediment slides off. This cleaning process can be performed when no water is flowing in.

[0012] By arranging several packages of flow guides one behind the other, the usually elongated basin can be used effectively without the individual flow guides becoming too long.

[0013] The flow paths of two adjacent packages of flow guide means are aligned with each other in such a way that the flow from the package at the front in the flow direction passes undisturbed into the package at the rear in the flow direction.

[0014] In the cleaning position, the flow guides run vertically to allow the sediment to slide off. A deviation from the vertical can also be sufficient.

[0015] In a further development of the invention, it can be provided that the flow guiding means of adjacent, i.e. successively arranged, packages of flow guiding means are arranged one behind the other with little or preferably no space between them.

[0016] In a further development of the invention, the flow guide means can be plate-shaped, so that the flow paths are formed in layers. These can be flat plates or plates provided with corrugations or ridges, with the corrugations or ridges ideally running in the direction of flow.

[0017] It is also possible, as proposed by the invention in a further embodiment, that the flow guiding means are designed in a profile-like manner, so that column-like flow paths are formed.

[0018] Flow guides of both types can also be combined. The transitions between plate-shaped, corrugated flow guides and profile-shaped flow guides can also be fluid. For example, stacked tubes can also be considered as flow guides.

[0019] The flow guides are arranged as pivotable packages. A drive can be provided for pivoting the packages. It can be provided that the packages can be pivoted individually, for example, by providing a separate drive for each package. However, it is also possible to have only one drive, which can be coupled to the individual packages.

[0020] In a further embodiment of the invention, however, it can also be provided that the packages can be pivoted together. This can be achieved either by a single drive common to all packages or by coupling individual drives.

[0021] It makes sense to position the drive outside or above the pool.

[0022] In a further embodiment of the invention, a constriction can be formed at the end of the flow paths, for example, by the plates forming the flow paths having a bend in their end region. This can achieve a more uniform flow through all flow paths.

[0023] In a further development of the invention, a drive can be provided for the short-stroke reciprocating movement of the flow guide means underwater. This short-stroke movement underwater is intended to rinse and thus detach the sediment from the flow guide means.

[0024] The longitudinal direction of the tank in which the flow guides are arranged usually also forms the main flow direction. It can be provided that the rotation axis of at least one set of flow guides, in particular all sets, runs perpendicular to the main flow direction. This allows the tank's space to be utilized as effectively as possible.

[0025] However, it can also be provided that the axis of rotation of at least one package of flow guiding means, in particular of all packages, runs parallel to the main flow direction.

[0026] It was mentioned at the beginning that in a vertical longitudinal section, the flow guides run horizontally. In a further embodiment, the flow guides of at least one package of flow guides can be arranged horizontally, forming horizontally running layers or horizontally running columns as flow paths. In this case, the sediment remains on the flow guides until deliberate cleaning takes place.

[0027] For example, the flow guide stacks can be cuboid-shaped. If the flow guides are plates, the plates are arranged one above the other, with their corners located at the edges of a cuboid.

[0028] However, it is also possible for the flow guide means to be arranged in such a way that they form the shape of a parallelogram in a vertical section running in the main flow direction.

[0029] In a further embodiment of the invention, it can be provided that the axis of rotation is arranged in the lower region of the respective package of flow guiding means.

[0030] Further features, details, and advantages of the invention will become apparent from the claims and the abstract, both of which are incorporated by reference into the description, the following description of preferred embodiments of the invention, and the drawings. Herein: Fig. 1 shows a longitudinal section through a device proposed by the invention for clarifying sediment-laden wastewater; Fig. 2 a longitudinal section through the device of the Fig. 1 in a different operating state; Fig. 3 a longitudinal section showing the arrangement of the flow guide means in the cleaning position; Fig. 4 a cross section through a package of flow guides along line A - A in Fig. 1; Fig. 5 one of the Fig. 4 corresponding cross-section in a modified embodiment; Fig. 6 a longitudinal section through a device of a further embodiment; Fig. 7 a longitudinal section through yet another embodiment; Fig. 8 simplifies, on an enlarged scale, the formation of flow guide means in a modified embodiment.

[0031] Fig. Figure 1 shows a longitudinal section of the device proposed by the invention for treating wastewater containing sediment. The device comprises a tank 1 that is essentially cuboid-shaped. The tank includes a bottom 2, a front end wall 3, a rear end wall 4 opposite the front end wall, and two side walls 5. The bottom 2 of the tank 1 is designed as a slightly inclined plane, with the gradient running toward the front end wall 3. At the lowest point of the tank at the end of the gradient, i.e., immediately behind the front end wall 3, a sludge sump 6 with an outlet 7 is formed. The outlet 7 can be opened from above the tank edge.

[0032] A water inlet 9 is located in the front end wall 3, through which the wastewater, which is to be freed from sediment, flows into the tank 1. The inlet can be by gravity or by means of a pump. A flow distributor 10 is located behind the water inlet 9 to divide and distribute the flow within the tank.

[0033] On the rear end wall 4 opposite the front end wall 3, a water outlet 11 is formed. In the example shown, this outlet is designed as an overflow weir, i.e., as a slot extending perpendicular to the plane of the drawing over most of the rear end wall 4. A baffle 12 is arranged in front of the water outlet to retain floating matter and light liquids. Behind the rear end wall 4, a chamber 13 is arranged, from which the water leaves the device through an outlet 14.

[0034] The direction from left to right in Fig. 1, ie from the front end wall 3 to the rear end wall 4 forms the main flow direction and at the same time represents the longitudinal direction of the basin 1.

[0035] In the example shown, two packages 15 of flow guides 16 are arranged in the tank 1. In the simplest case, these are flat plates. These plates are arranged parallel to one another and form flow paths 17 between them. The distance between adjacent flow guides 16 within a package 15 is the same for all flow paths 17. In the working position shown, all flow guides 16 and thus the flow paths 17 formed between them run horizontally. The uppermost flow guide 16 is at the height of the maximum water level 18, which is determined by the water outlet 11. The lowest flow guide 16 is at a specific distance 19 from the floor 2 of the tank 1. This distance 19 forms a sludge collection chamber.

[0036] The water entering the basin 1 flows through the flow paths 17 to the outlet 11. Overflow is prevented by an upper cross board 20, and underflow by a cross board 21 arranged at the rear end of the second package 15. The two cross boards 20, 21 extend between the two side walls 5. In the Fig. 1 Sealing strips not shown in front of and behind the packages 15 prevent water from flowing between the side walls 5 of the basin 1 and the packages 15.

[0037] The flow guide means 16 of each package 15 are of the same size and are combined in such a way that in the Fig. In the vertical longitudinal section shown in Figure 1, the ends of the flow guides 16 form a parallelogram. The flow guides 16 of the first pack 15 are at the same height as the flow guides 16 of the second pack 15. As a result, the flow paths 17 lead flush from the first pack into the second pack 15. The distance between the two packs 15 is negligibly small; it is shown larger in the figures for clarity. Both packs 15 of flow guides 16 are identically designed.

[0038] Each package is pivotally mounted on a pivot axis 22 in the region of its front lower edge. The pivot axis 22 is mounted in a pivot bearing 23 on each of the two side walls 5. The two rear upper edges of the two packages 15 are connected to each other by a link 24.

[0039] The device described so far operates as follows. The water entering the basin is divided by the flow distributor 10 and distributed in the space in front of the stacks 15 of flow guides 16 within the basin. The water then flows through the flow paths 17 in individual laminar flow layers. During this flow, sediment contained in the water settles on top of the flow guides 16. The water, freed from the sediment, leaves the basin through the water outlet 11.

[0040] The sediment remains on the flow guides 16.

[0041] To remove the sediment from the flow paths 17, the device proposed by the invention offers two options. For this purpose, there is a drive 25, which is schematically illustrated in the figures. The drive 25 is connected via a rod 26 to the rear upper end of the first set 15 of flow guide means 16 and, via the aforementioned guide rod 24, also to the second set 15.

[0042] The first cleaning option consists in pivoting the packages 15 back and forth several times around the rotational axis 22 with the aid of the drive 25, at a relatively small angle, when the supply is turned off but the container 1 is still filled with water. Fig. 2. It is therefore a short-stroke movement that is repeated several times. This creates back and forth currents in the flow paths 17, which loosen and rinse away the sediment. The sediment thus reaches the sludge collection chamber. The second cleaning option then takes place, in which the packages 15 are pivoted into their cleaning position, in which the flow guides 16 run essentially vertically or at least sufficiently steeply. The sludge loosened by the back and forth movement now flows out of the flow paths together with the water. The basin is now emptied, for example, into a wastewater sewer, whereby most of the sludge is disposed of. The remaining sludge can then be removed from the sludge collection chamber, for example using a flushing tip.

[0043] After removing the sludge through the outlet 7, the packages 15 of flow guide means are returned to their Fig. 1 shown working position tilted back.

[0044] The drive indicated in the figures and described here represents one possibility for moving the flow guide means 16. It can also be constructed differently.

[0045] Fig. 4 shows a simplified section along line A - A in Fig. 1 by a package of flow guide means 16. The flow guide means 16 also run horizontally in this vertical section running transversely to the longitudinal direction, so that the flow paths 17 are formed as horizontal layers.

[0046] Fig. 5 shows one of the Fig. 4 corresponding cross-section through a package of flow guides 16a, which are also designed as flat plates, but are arranged at an angle. This creates flow paths 17, which are designed at an angle, but through which water flows in a horizontal direction, i.e. perpendicular to the section plane of the Fig. 5. When the flow guide means 16a are arranged in this way, the sediment can already reach the sludge collection chamber while the water is flowing downwards in the direction of the arrows.

[0047] Fig. 6 shows a modified embodiment in which the packages of flow guide means also have the parallelogram shape, but are oriented in the opposite direction to the arrangement of the Fig. 1 to 3. Accordingly, the packages 15 are mounted at their rear, lower end with a rotation axis 22 in the pivot bearing 23, and the pivoting is effected by a drive 25 in the region of the rear end wall 4 of the basin 1.

[0048] Instead of a parallelogram-like arrangement of the flow guide means 16 within a package, the flow guide means 16 can also be arranged in cuboid shape, see the Fig. 7. A separate drive 25 can be provided for each package.

[0049] It is also possible that the cuboidal design of packages of flow guide means is not pivoted in the direction of the front end wall 3, as in Fig. 7, but in the direction of the rear bulkhead 4 according to the arrangement of the Fig. 6.

[0050] Fig.Figure 8 shows, in a highly simplified form, another possibility that can be applied to the devices of the preceding embodiments. Here, the flow guides 16 are designed as flat metal sheets. The rear end of each flow guide 16 of the rearward pack 15 in the flow direction is bent and forms a small ledge 27, which leads to a narrowing of the cross-section of the flow paths 17 of the rearward pack 15 in the flow direction. This narrowing leads to a more uniform flow through all flow paths 17. Furthermore, this measure also serves to prevent sediment from being carried away with the flow and mixing back into the outflowing water.

[0051] Something similar can also be achieved by arranging the flat sheets not exactly horizontally, but slightly rising, in the range of a few degrees of angle to the horizontal.

Claims

[1] Device for the treatment of sediment-laden wastewater, with - an elongated pelvis (1), - a water inlet (9) into the basin (1), - a water outlet (11) from the basin (1), - wherein the water inlet (9) and the water outlet (11) are arranged on opposite ends of the elongated basin (1), - a sludge collection chamber in the lower part of the basin (1), as well as - a plurality of flow guide means (16) which - form a multitude of parallel flow paths (17) between each other and - are arranged in several packages (15) arranged one behind the other in the main flow direction, each having a plurality of flow guiding means (16), which - individually around a horizontal axis (22) from a working position in which - the flow paths (17) of successively arranged packages (15) are aligned with each other and in a vertical longitudinal section the flow guide means (16) run horizontally, are arranged to be pivoted into a cleaning position in which - the flow guide means (16) run vertically. [2] Device according to claim 1, in which the flow guiding means (16) of adjacent packages (15) are arranged one behind the other without any gap or with a very small, namely negligible, gap. [3] Device according to claim 1 or 2, in which the flow guiding means (16) are plate-shaped and form layer-like flow paths (17). [4] Device according to one of the preceding claims, in which the flow guiding means (16) are profile-like and form column-like flow paths. [5] Device according to one of the preceding claims, with a motor drive (25) designed individually for pivoting the packages (15). [6] Device according to one of the preceding claims, with a drive (25) pivoting the packages (15) together. [7] Device according to one of the preceding claims, with a constriction of the flow paths (17) arranged at the end of the flow paths (17). [8] Device according to one of the preceding claims, with a drive (25) for the short-stroke reciprocating movement of the flow guiding means (16) under water. [9] Device according to one of the preceding claims, in which the axis of rotation (22) of at least one package (15) extends transversely to the main flow direction. [10] Device according to one of the preceding claims, in which the axis of rotation of at least one package runs parallel to the main flow direction. [11] Device according to one of the preceding claims, in which the flow guiding means (16) of at least one package (15) are arranged horizontally to form horizontally extending layer-like or column-like flow paths (17). [12] Device according to one of the preceding claims, in which the flow guiding means (16) of at least one package (15) are arranged obliquely to form obliquely running layer-like flow paths (17) transversely to the main flow direction. [13] Device according to one of the preceding claims, in which the flow guiding means (16) of a package (15) are arranged in cuboid shape. [14] Device according to one of claims 1 to 12, in which the flow guiding means (16) of a package (15) are arranged in prism form. [15] Device according to one of the preceding claims, in which the axis of rotation (22) is arranged in the lower region of the respective conductive agent package (15).

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