CA2421728C

CA2421728C - Sedimentation filtration installation

Info

Publication number: CA2421728C
Application number: CA002421728A
Authority: CA
Inventors: Klaus Hoffmann
Original assignee: Individual
Current assignee: Individual
Priority date: 2000-09-11
Filing date: 2001-09-11
Publication date: 2009-11-10
Anticipated expiration: 2021-09-11
Also published as: EP1324812B1; WO2002020121A2; WO2002020121A3; ATE262366T1; US20030116500A1; CA2421728A1; US6868974B2; ES2218460T3; EP1324812A2; DE50101802D1

Abstract

For increasing the capacity of a continuously operating sedimentation filtration device, it is suggested to supply the processing liquid to be cleaned before or adjacent to the filter body (2) on opposed sides into the sedimentation container (1), wherein underneath the filter body (2) a comparatively high settling chamber (7) is formed and between the filter body (2) and the supply lines a separating plate (6) is provided so that the processing liquid to be cleaned is guided mandatorily into the settling chamber (7). The cross-sections of the supply lines provided on opposed sides are comparatively large so that only minimal flow velocities of the incoming medium will occur.

Description

Literal Translation of PCT/DE01/03486 (WO 02720121) Sedimentation Filtration Installation The invention relates to a continuously operating sedimentation filtration installation for cleaning contaminated processing liquids such cooling agents;
hydroforming water; drilling, rolling, grinding, and turning emulsions;
rinsing water; and the like. The installation is comprised of a sedimentation container with a plurality of plate-shaped filter elements arranged at a slant and extending parallel to one another at a spacing to one another. The filter elements together form a filter body. The installation further comprises a removal device for the deposited sediment, a supply opening into the sedimentation container for introducing contaminated processing liquid, and a clean liquid tank connected to an overflow of the sedimentation container and configured for receiving the filtered processing liquid.

Sedimentation filtration devices are used for cleaning processing liquids which are contaminated during a production or machining process by particles whose relative density is greater than that of the actual processing liquid. These particles settle in a container as a result of the gravity acting on them and form a so-called sediment which must be removed from the sedimentation container by means of suitable devices.

In order to increase the settling speed of the particles and thus the throughput of such a device, plate-shaped filter elements are arranged according to the prior art in the interior of the sedimentation container and are positioned at a slant and spaced from one another by means of spacer elements.

By means of the described arrangement of the filter elements, the deposition Lit. TRL of PCT/DE01/03486 (WO 02/20121) flled 9/11/2001 - Inventor(s): Klaus Hoffmann path of the individual particles is drastically reduced; in the known devices, it is presently approximately 5 to 15 mm.

As a result of shortening the deposition path, the dirt particles to be removed practically do not disturb one another during deposition so that the cleaning effect and capacity of such devices is increased in comparison to simple settling containers.

The sediment deposited on the filter elements is removed by means of blowpipes arranged underneath the filter body, wherein, in the case of large size installation, the filter elements are brought into a vertical position by suitable adjusting devices for the task of blowing off the sediment.

The thick particle cake then sinks from the filter elements onto the bottom of the settling container from where it is removed by scraper belts or similar removal devices.

In the known devices, the processing liquid to be cleaned is supplied by means of a supply pipeline adjacent to the filter body such that the processing liquid flows mainly laterally into the filter body.

In order to prevent that air bubbles, which would disturb the settling process, are introduced with the processing liquid into the sedimentation container, the supply lines have sufficiently sized venting lines. Since during cleaning of the filter elements by means of compressed air it is advantageous to have a low liquid level, this level can be adjusted by means of pumps.

The cleaned processing liquid passes through an overflow in the sedimentation container into a clean liquid tank from where it can be returned into the corresponding machining or production process.

Lit. TRL of PCT/DE01/03486 (WO 02/20121) filed 9/11/2001 - Inventor(s): Klaus Hoffmann In addition to removal of dirt particles of higher relative density from the processing liquid, there often occurs a contamination of processing liquid with so-called foreign oil, in particular, in metal processing, wherein the foreign oil has a smaller relative density in comparison to the processing liquid and, as a result of this, will float to the surface of the liquid in the sedimentation container. At the surface, it can be skimmed off by corresponding weirs and removal devices, wherein the overflow from the sedimentation container to the clean liquid tank is arranged closely underneath the upper liquid level.

In the known sedimentation filtration devices of the afore described configuration and function type, the processing liquid to be cleaned is supplied via a pipeline having a comparatively minimal flow cross-section and opening laterally adjacent to or before the filter body. The free space which is formed underneath the filter body is relatively low in the devices of the prior art because it is desired to have a minimal height of the entire installation.

The described filtration devices however have a minimal throughput and are prone to disturbances when an increased dirt loading of the processing liquid is present.

It is therefore an object of the invention to provide a reliably operating sedimentation filtration device with increased throughput.

This object is solved according to the invention in that, for supplying the processing liquid into the sedimentation container, at least two connecting sockets are provided on opposite sides of the container that open adjacently to or in front of the filter elements; in that a settling chamber filled with liquid is provided between the bottom side of the filter body and the bottom of the sedimentation container whose vertical height is at least one fifth of the vertical height of the filter body; and in that a flow conducting plate is provided between Lit. TRL of PCT/DEOI/03486 (WO 02/20121) filed 9/11/2001 - Inventor(s): Klaus Hoffmann the filter body and the connecting sockets which mandatorily guides the supplied processing liquid into the settling chamber.

By means of these measures according to the invention, the flow velocity of the medium flowing into the settling container, for identical pipeline diameter, is already cut at least in half, wherein this effect can be increased even more by enlarged pipe cross-sections. At the same time, the flow direction in front of the settling chamber is reversed so that only locally limited flow swirls will occur which only minimally reduce the settling velocity of the dirt particles.
Moreover, with this measure it is prevented that already deposited sediment is again whirled up into the area of the filter body. The flow conducting plate provided between the filter body and the connecting sockets separates the incoming processing liquid initially from the filter body and guides it into the settling chamber underneath the filter elements from where the processing liquid flows from the bottom to the top through the filter body. As a result of the reduction of the flow velocity, greater dirt particles have already settled beforehand.
Also, increasing the height of the settling chamber contributes to a calming effect on the turbulent flow so that less sediment is whirled up.

The connecting sockets opening laterally adjacent to or before the filter body can be widened in a box shape for achieving an additional reduction of the inflow velocity, wherein the connecting sockets extend preferably at a slant into the settling chamber in order to avoid pre-sedimentation within the connecting sockets. Because of the slanted position of the connecting sockets, the sediment which is settling thereon slides into the settling container and can be removed from it by means of the aforementioned scraper belt. This measure is important, in particular, for a high dirt loading of the processing liquid.

As mentioned already before, for cleaning the filter elements it is recommended, in order to facilitate removal of the sediment, to position the filter elements Lit. TRL of PCT/DE01/03486 (WO 02/20121) filed 9/11/2001 - Inventor(s): Klaus Hoffmann vertically during the process of blowing compressed air by means of blowpipes arranged underneath the filter body . For this purpose, preferably a pneumatic drive or pivoting device is used which pivots the individual filter elements from the slanted working position into the vertical position. The filter elements are comprised, for example, of steel plates which are seated in a sawtooth-shaped receptacle and can be pivoted by means of the aforementioned drive device engaging the upper end of the filter elements.

The receptacle for the filter elements is preferably arranged approximately centrally on opposite sides of the filter body. In this way, the filter elements when positioned vertically are pivoted about a central pivot so that the required adjusting forces are minimized.

In order not to have to connect the individual filter elements with the drive device for the pivoting action, it is possible to arrange before, behind, and between the filter elements driving plates which rests against the filter elements or their spacer elements and are pivotably connected with their upper ends to the pivoting device. The filter elements are simultaneously tilted by means of a synchronous pivoting of the driving plates about the pivot.

In order to accelerate the cleaning process carried out by means of the compressed air to be blown in, according to another embodiment of the invention it is provided that several blowpipes are arranged underneath the filter body and that the blowpipes are controlled by individual valves. The blow pressure is approximately three to six bar.

In order to prevent plugging of the blowpipes or to be able to remove sediment that has entered via the outflow openings, the blowpipes are preferably loadable at both ends with compressed air. In this way, the cleaning effect on the filter elements is improved also.

Lit. TRL of PCT/DE01/03486 (WO 02/20121) filed 9/11/2001 - Inventor(s): Klaus Hoffmann In order to be able to effectively remove the sediment deposited on the filter elements, an unbalance-type shaker can be provided additionally which engages the filter elements or the driving plates.

The removal device for removing the deposited sediment from the bottom of the settling chamber is preferably configured as a so-called scraper belt. This scraper belt is comprised of severable removal strips arranged parallel to one another and supported on two chain guides. The removal strips are pulled across the bottom of the settling chamber.

In order to minimize hooking or wear of the removal strips or of the container bottom, spacer guides can be provided that extend transversely relative to the removal strips. Between them a permanent sediment layer is deposited which also minimizes wear.

The scraper belt is preferably guided and deflected by means of cylindrical rolls in the settling container. The rolls have grooves engaged by the drive chains in a positive-locking way. The drive of the chains is realized to be synchronous by means of corresponding pinions wherein the deflection of the scraper belt from its horizontal run in the container bottom into the removal direction extending upwardly at a slant is realized by means of two rolls or pinions which are arranged relative to one another with vertical displacement. In this way, the deflection angle is increased which provides a significant advantage with regard to calm running of the chain and, over all, reduces the wear of the scraper belt.
In order to be able to safely remove the sediment which is entrained by the slantedly upwardly running removal strips, at the upper deflection point of the scraper belt special stripper devices are preferably provided which, for example, are comprised of pendulously suspended stripper elements which automatically place themselves onto the removal strips and move relative to the removal strips Lit. TRL of PCT/DE01/03486 (WO 02/20121) filed 9/11/2001 - Inventor(s): Klaus Hoffmann upon further running of the chain so that the sediment deposited or conveyed here is stripped off and drops into a collecting container arranged underneath the scraper belt.

For removing top-floating foreign liquids from a surface of a processing liquid contained in the sedimentation container, for example, a suction pump, a skimmer, or an oil removal belt with rib-shaped stripper elements positioned at a spacing to one another can be provided. In order to ensure removal of the foreign oil that has floated to the top as completely as possible, on opposed sides of the oil removal belt strip-shaped floating oil barriers can be provided which ascend in the direction toward the overflow weir for the foreign oil. In this way, a lateral flow of the oil is prevented and an almost complete removal is achieved.

In order to ensure a continuous skimming or sucking off of the foreign oil, it is also expedient to adjust the liquid level in the sedimentation container to a constant value. For this purpose, for example, ultrasound sensors are provided which detect the respective liquid level in a contactless way and which adjust by means of controllable governing devices, such as overflow flaps, pumps, or the like, the preset value. For a corresponding height of the overflow toward the clean liquid tank closely underneath the adjusted liquid level, it is also ensured by means of the liquid level control that practically no foreign oil will flow into the clean liquid tank.

It should be noted that the filtration device, for maintaining the physical/chemical parameters, in particular, the operating temperature of the processing liquid, can be provided with additional devices such as cooling devices, heaters, metering pumps and the like, which are optionally arranged in an additional tank.

Moreover, it was found to be expedient to configure the spacer elements for the Lit. TRL of PCT/DE01/03486 (WO 02/20121) filed 9/11/2001 - Inventor(s): Klaus Hoffmann filter elements as parallel extending spacer strips so that a preferred sedimentation in the longitudinal direction of the filter elements is prevented.

By means of an additional tank arranged between the sedimentation container and the clean liquid tank, the cleaning of the filter body can be simplified. The additional tank is provided with a slanted bottom, for example, with a V-shape, and with one or several pumps which remove by pumping at the deepest location the collected sludge and convey it, for example, to the intake area of the sedimentation container. The additional tank can have vertically arranged flow conducting plates which divide it into several chambers. They serve for receiving processing liquid from the sedimentation container when its liquid level is to be lowered for cleaning the filtration elements.
In accordance with this invention, there is provided a continuously operating sedimentation filtration device for cleaning contaminated processing liquid, comprising a sedimentation container with a plurality of plate-shaped filter elements, arranged at a slant and extending parallel to one another at a spacing to one another, the filter elements forming a filter body, further comprising a removal device for the deposited sediment, a supply opening into the sedimentation container for introducing contaminated processing liquid, and a clean liquid tank connected to an overflow of the sedimentation container for receiving the cleaned processing liquid, wherein, for supplying the processing liquid into the sedimentation container, at least two connecting sockets are provided that open on opposed sides of the container adjacent to or before the filter elements, wherein between the bottom side of the filter body and the bottom of the sedimentation container a settling chamber filled with liquid is provided, whose vertical height is at least 1/5 of the vertical height of the filter body, characterized in that a separating plate is provided between the filter body and the connecting sockets which separates the supplied processing liquid from the filter body and guides it mandatorily into the settling chamber, from where the processing liquid flows through the filter body from the bottom to the top, and wherein the removal device for the deposited sediment is a scraper belt guided from a horizontal running direction across the bottom of the sedimentation container into a slantedly upwardly extending removal direction across at least two rolls or pinions that are vertically staggered relative to one another.

The invention will be explained in the following in an exemplary fashion with the aid of the drawing.

It is shown in:

Fig. 1 a schematic longitudinal section of the sedimentation filtration device according to the invention;

Fig. 2 a cross-section of the filtration device according to Fig. 1 in the area of the sedimentation container in a first embodiment;

Fig. 3 a cross-section of the filtration device according to Fig. 1 in the area of the sedimentation container in a second embodiment;

Fig. 4 a lateral sectional view of the filter body, the driving plates, and the pivoting device;

- 8a -Fig. 5 a schematic plan view onto the sedimentation filtration device;
Fig. 6 a view of the scraper belt with the chain guides;

Fig. 7 a side view of the upper drive pinion for the scraper belt with the pendulous strippers;

Fig. 8 a lateral sectional view of the controllable level control flap; and Fig. 9 a plan view and a section view of a filter element with parallel extending spacer elements.

The sedimentation filtration device schematically illustrated in Fig. I is comprised substantially of a sedimentation container 1 with a filter body 2 which is comprised of several parallel extending filter elements 3 spaced apart from one another. The spacing of the individual filter elements 3 relative to one another is determined by means of parallel extending spacer strips 4 which are welded onto the filter elements 3 (see Fig. 9).

By means of a supply line 5 opening at opposed sides into the sedimentation container 1 before or adjacent to the filter body 2 (compare Figs. 2 and 3), the processing liquid to be cleaned is introduced into the sedimentation container 1.
The filter body 2 is separated by means of an angled separation plate 6, welded onto the lateral walls of the sedimentation container 1, from the incoming processing liquid such that the processing liquid flows first into the settling chamber 7 which is formed underneath the filter body 2. From here, the contaminated processing liquid rises through the filter body 2 to the top and runs via lateral flow channels 8, 9 (compare Fig. 5) across the weir 10 first into an intermediate cooling tank 11 with a cooling device 12 and from there across the weir 13 into the clean liquid tank 14 from where it is returned by means of the Lit. TRL of PCT/DE01/03486 (WO 02/20121) filed 9/11/2001 - Inventor(s): Klaus Hoffmann supply pumps 15 into the processing circuit.

In the settling chamber 7 underneath the filter body 2 a scraper belt 16 is provided whose removal strips 17 (compare Fig. 6) are pulled across the bottom 18 of the sedimentation container I in the longitudinal direction of the filtration device and entrain the deposited sediment and move it out of the sedimentation container 1 in the upward direction. The scraper belt 16 is driven and deflected at its ends by pinions 19, 20 and guided about profile rolls 21, 22 which are arranged relative to one another with vertical displacement so that the deflection angle between the horizontal run area and the slantedly upwardly extending conveying area becomes more flat. The roll 23 serves as a tensioning element.
In the area of the pinion 19, a stripper devices 24 is provided with which the removed sediment is automatically stripped from the removal strips 17 of the scraper belt 16; it will be explained in the following in more detail in connection with Fig. 7.

The supply lines 5 have sufficiently sized venting pipes 25 through which entrained air bubbles, which could cause foam formation within the sedimentation container 1 and a disruption of the sedimentation process, are removed effectively.

In the upper area of the sedimentation container 1 two lateral floating oil barriers 26 are provided through which the foreign oil floating to the top is forced into an oil chamber 27 (compare Fig. 5).

The foreign oil which is collected in the oil chamber 27 can be removed to by means of the oil suction pump 28.

Underneath the foreign oil, a dirt pump 29 conveys the processing liquid and Lit. TRL of PCT/DE01/03486 (WO 02/20121) filed 9/11/2001 - Inventor(s): Klaus Hoffmann sediment back into the sedimentation container 1. An additional pump 30 serves as a circulation pump and ensures a continuous circulation of the liquid in the sedimentation container 1 in the case of standstill of the device.

By means of a metering pump 31 in the settling chamber 7, it is possible, for example, to add oil in the case of cleaning being performed on emulsions having a preset oil/water ratio that must be maintained.

In the sectional illustration of Fig. 2, it is illustrated that the supply line 5 opens at opposed sides into the sedimentation container 1 before or adjacent to the filter body 2, wherein the supply pipes 32, 33 open at a slant into the sedimentation container 1 and have a comparatively large cross-section.

The settling chamber 7 arranged underneath the filter body 2 has a height which is greater than one fifth of the vertical filter height; the scraper belt 16 guided on the chains 34, 35 is running in this chamber 7.

In the embodiment illustrated in Fig. 3, the supply pipes 36, 37 are widened to a box shape so that the intake cross-section for the processing liquid into the sedimentation container 1 is again enlarged in comparison to the embodiment of Fig. 2 .

With reference to the sectional illustration according to Fig. 4, an adjusting linkage 38 will be explained which is used for pivoting the filter elements 3.
The filter elements 3 are combined to filter element packages 39, 40 between which driving plates 41, 42, 43, 44 are arranged. The driving plates and the filter element packages are supported in a pivotable way on a central receptacle 45 wherein the driving plates are pivotably connected with their upper ends to the adjusting linkage 38. By extending an adjusting cylinder 46, the individual driving plates can be moved from the slanted working position into a vertical cleaning Lit. TRL of PCT/DE01/03486 (WO 02/20121) filed 9/11/2001 - Inventor(s): Klaus Hoffmann position; this is illustrated by the filter element package 40.

In this position, by means of the compressed air line 47 compressed air can be blown into the space between the filter elements 3 so that the deposited sediment can be removed and drops downwardly into the settling chamber 7.
For supporting the cleaning process, a shaker (not illustrated) can engage the linkage 38.

In the plan view according to Fig. 5, the position of the oil chamber 27 is illustrated. An overflow line 48, which opens underneath the liquid level, returns the processing liquid into the sedimentation container I while an oil cup 49 serves for sucking off the removed oil by means of the oil suction pump 28 (compare Fig. 1).

In Fig. 5, the lateral flow channels 8, 9 are also illustrated through which the cleaned processing liquid flows laterally in the direction to the clean liquid tank 14.

In the illustration according to Fig. 6, the individual components of the scraper belt 16 are illustrated. The scraper belt is comprised of T-shaped removal strips 17 which are fastened laterally on driving pawls 50 which are fastened, in turn, on oppositely arranged chain members 51, 52. The scraper belt 16 runs in the longitudinal direction of the filtration device according to Fig. 1 to the left across the profiled rolls 21, 22 wherein the transverse legs 53 of the removal strips move the deposited sediment in front of them and at a slant upwardly to the stripper device 24.

Such a stripper device 24 is illustrated in Fig. 7. It is comprised substantially of a plate 54 which is bent at its forward end and arranged between the pinions 19, 20. By means of a hinge 55 it is pivotably supported on a holder 56. In a lower Lit. TRL of PCT/DE01/03486 (WO 02/20121) filed 9/11/2001 - Inventor(s): Klaus Hoffmann position, the bent end 57 of the plate 54 rests against the surface of the transverse legs 53 and scrapes off the sediment 58 positioned on the leg 53 to the left as a result of the relative movement caused by the continuing movement of the scraper belt 16 so that the sediment 58 drops into a container arranged underneath the stripper device 24.

Upon further movement of the scraper belt 16 the plate 54 then moves into an approximately horizontal upper position from which it drops down again when it is no longer in engagement with the upper transverse leg 53 so that the stripping process can be repeated.

In Fig. 8, an adjustable flap 59 is illustrated with which the liquid level in the sedimentation container 1 can be adjusted. The flap 59 is pivotably supported on a hinge 60 and can be pivoted on a circular path by means of the adjusting cylinder 61 and the angular pawl 62 welded to the flap 59, wherein the angular pawl 62 is connected pivotably to the adjusting cylinder 61. The adjusting cylinder 61 itself is pivotably connected to the hinge 63 and can be adjusted by means of the electric motor 64 so that, depending on the position of the flap 59, the desired liquid level results in the sedimentation container.

The configuration of the individual filter elements 3 with the spacer strips 4 is illustrated in plan view and in section in Fig. 9. In contrast to the bulging portions provided according to the prior art on the filter elements 3 and arranged staggered relative to one another, no preferred sedimentation fan results for the parallel extending spacer strips 4 so that longer operating times of the filtration device are possible between the individual cleaning intervals.

Lit. TRL of PCT/DE01/03486 (WO 02/20121) filed 9/11/2001 - Inventor(s): Klaus Hoffmann List of Reference Numerals 1) sedimentation container 31) metering pump 2) filter body 32) supply pipe 3) filter elements 33) supply pipe 4) spacer strips 34) chain 5) supply line 35) chain 6) separating plate 36) supply pipe 7) settling chamber 37) supply type 8) flow channel 38) adjusting linkage 9) flow channel 39) filter element package 10) weir 40) filter element package 11) cooling tank 41) driving plate 12) cooling device 42) driving plate 13) weir 43) driving plate 14) clean liquid tank 44) driving plate 15) supply pumps 45) receptacle 16) scraper belt 46) adjusting cylinder 17) removal strip 47) compressed air line 18) bottom 48) overflow line 19) pinion 49) oil cup 20) pinion 50) driving pawl 21) profile roll 51) chain member 22) profile roll 52) chain member 23) tensioning element, roll 53) transverse leg 24) stripper device 54) plate 25) venting pipe 55) hinge 26) floating oil barrier 56) holder 27) oil chamber 57) bent end 28) oil suction pump 29) dirt pump 30) circulation pump Lit. TRL of PCT/DE01/03486 (WO 02/20121) filed 9111/2001 - Inventor(s): Klaus Hoffmann 58) sediment 59) adjustable flap 60) hinge 61) adjusting cylinder 62) angular pawl 63) hinge 64) electric motor Lit. TRL of PCT/DE01/03486 (WO 02/20121) filed 9/11/2001 - Inventor(s): Klaus Hoffmann

Claims

CLAIMS:

1. Continuously operating sedimentation filtration device for cleaning contaminated processing liquid, comprising a sedimentation container with a plurality of plate-shaped filter elements, arranged at a slant and extending parallel to one another at a spacing to one another, the filter elements forming a filter body, further comprising a removal device for the deposited sediment, a supply opening into the sedimentation container for introducing contaminated processing liquid, and a clean liquid tank connected to an overflow of the sedimentation container for receiving the cleaned processing liquid, wherein, for supplying the processing liquid into the sedimentation container (1), at least two connecting sockets are provided that open on opposed sides of the container adjacent to or before the filter elements (3), wherein between the bottom side of the filter body (2) and the bottom of the sedimentation container (1) a settling chamber (7) filled with liquid is provided, whose vertical height is at least 1/5 of the vertical height of the filter body (2), characterized in that a separating plate (6) is provided between the filter body (2) and the connecting sockets which separates the supplied processing liquid from the filter body (2) and guides it mandatorily into the settling chamber (7), from where the processing liquid flows through the filter body (2) from the bottom to the top, and wherein the removal device for the deposited sediment is a scraper belt (16) guided from a horizontal running direction across the bottom (18) of the sedimentation container (1) into a slantedly upwardly extending removal direction across at least two rolls (21, 22) or pinions that are vertically staggered relative to one another.

2. Sedimentation filtration device according to claim 1, characterized in that the supply for introducing the contaminated processing liquid is vented.

3. Sedimentation filtration device according to claim 1, characterized in that the connecting sockets for introducing the processing liquid into the sedimentation container (1) are widened to a box shape.

4. Sedimentation filtration device according to one of the claims 1 or 3, characterized in that the filter elements (3) or the filter body (2) is pivotable from the slanted working position into a cleaning position extending approximately perpendicularly to the horizontal.

5. Sedimentation filtration device according to claim 4, wherein the filter elements (3) or the filter body (2) is pivotable by means of a pneumatic drive device.

6. Sedimentation filtration device according to one of the claims 1 to 5, characterized in that, for cleaning the filter elements (3) or the filter body (2), blowpipes that can be loaded with compressed air are provided underneath the filter body (2) in the sedimentation container (1).

7. Sedimentation filtration device according to claim 6, characterized in that the blowpipes can be controlled individually by compressed air valves with compressed air.

8. Sedimentation filtration device according to claim 6 or 7, characterized in that the blowpipes have compressed air connectors on both ends.

9. Sedimentation filtration device according to one of the claims 1 to 8, characterized in that an unbalance-type shaker is provided for cleaning the filter elements (3) or the filter body (2).

10. Sedimentation filtration device according to one of the claims 1 to 9, characterized in that the scraper belt (16) is comprised of removal strips (17) guided on chains and arranged parallel to one another at a spacing to one another, which strips run across the bottom (18) of the sedimentation container (1).

11. Sedimentation filtration device according to one of the claims 1 to 10, characterized in that in the bottom area of the sedimentation container (1) at least two spacer guides are provided extending transversely to the movement direction of the removal strips (17) and resting against the underside of the removal strips (17).

12. Sedimentation filtration device according to one of the claims 1 to 11, characterized in that, for driving, for deflecting, or for tightening the chains of the scraper belt (16), pinions or cylindrical rolls with grooves are provided and engaged by the chain members (51), (52) of the chains in a positive-locking way.

13. Sedimentation filtration device according to one of the claims 1 to 12, characterized in that the filter elements (3) have spacer elements in the form of spacer strips (4) extending parallel to one another.

14. Sedimentation filtration device according to one of the claims 1 to 13, characterized in that an oil removal belt, running above the liquid level and provided with rib-shaped strippers positioned at the spacing to one another; a skimmer; or an oil suction pump is provided for removal of foreign oil floating on the processing liquid.

15. Sedimentation filtration device according to one of the claims 1 to 14, characterized in that in the sedimentation container (1) above the filter body (2) two laterally arranged at least partially slantedly extending stay-shaped floating oil barriers (26) are provided.

16. Sedimentation filtration device according to one of the claims 1 to 15, characterized in that the liquid level of the processing liquid in the sedimentation container (1) is adjustable by means of a level control.

17. Sedimentation filtration device according to claim 16, characterized in that the liquid level of the processing liquid is detected by ultrasound sensors and is adjustable by controllable governing devices.

18. Sedimentation filtration device according to claim 17, wherein the controllable governing devices are overflow flaps.

19. Sedimentation filtration device according to one of the claims 1 to 18, characterized in that for removal of the sediment (58) from the removal strips (17) of the scraper belt (16) a pendulously suspended stripper device (24) is provided acting abrasively on the topside of the removal strips (17) and moving relative to the scraper belt (16) or the removal strips (17).