DE10057269A1 - Separation device for separating liquid from solids and their use - Google Patents

Abstract

The invention relates to a separating device for separating liquid (18) from solids (31), in particular for separating liquid (18) from separated material, which has previously been separated from a solid-liquid mixture (33), comprising: DOLLAR A - a screw conveyor (1), DOLLAR A - provided with a housing (2), shaft (4) and a conveyor helix (3) - a compacting zone (15) in which solid matter conveyed by the screw conveyor (1) is compressed to squeeze out liquid, DOLLAR A - a sieve surface (16), in particular at the compacting zone (15), and DOLLAR A - a solids discharge section (7), to which extruded solids are guided away from the axis of rotation of the screw conveyor (1). To improve the dewatering effect, the invention proposes a counter-conveying device (9) for conveying solid matter in a direction (10) opposite at least with a directional component of the conveying direction (8) of the screw conveying device (1) in such a way that in the compacting zone ( 15) and / or on the solids discharge section (7), the solids are put under pressure by the counter-conveyor (10), so as to increase the squeezing forces for squeezing out liquid or the squeezing forces (P) for pushing out squeezed solids out of the separating device. Alternatively or additionally, to improve the drainage effect, the invention provides that the screen surface (16) at least ...

Description

The invention relates to a separating device for separating liquid from solids, in particular for separating liquid from separated material, which has previously been separated from a solid-liquid mixture, comprising:
a screw conveyor device provided with a housing, shaft and a spiral conveyor,

• - A compacting zone, in which the screw conveyor conveys the solid is compressed to squeeze out liquid,
• - A screen surface, especially at the compacting zone, and
• - A solid discharge section, on which pressed solid from the Axis of rotation of the screw conveyor is guided away.

The invention also relates to the use of such a separation device. Such a separation device and its use is known from DE 42 11 606 C1 known.

The separation device according to the invention is intended primarily in the area of the mecha African wastewater treatment can be used. Mechanical wastewater treatment In many municipal sewage treatment plants, screening or computing plants with one integrated press zone, which is also referred to as a drainage zone. Such machines separate solids from a solid-liquid mixture, transport the material by means of a screw conveyor or a spiral and dewater remove the separated material by pressing it, for example in a con to throw off tainer. In order to save disposal costs, it is as dry as possible Remaining material wanted.

An example of such a separation device is mentioned in the above DE 42 11 606 C1 known. In this known separator, solid that adheres a separation area located in a solid-liquid mixture melt, by means of a screw conveyor with a housing, a shaft and a  Conveying spiral conveyed upwards from the liquid phase. At the end of the conveyor line a compacting zone is provided in which the solid for dewatering, i.e. H. for separating liquid, is pressed. In the upper area of the screw conveyor dereinrichtung the housing merges into a chute, through which the separated Solid is thrown down into a container. Before and in the area of the The compacting zone is formed after the chute. In the Compacting zone, the solid is compressed into a graft. This too is pressed together by a slidably adjustable fixed or fe the resiliently mounted counter pressure plate is reinforced.

How the water squeezed out during the pressing is drained off is in the DE 42 11 606 C1 did not say anything. It is just a screening area - the separation area - At the beginning of the conveyor line to sieve the solid out of the waste water spoke.

A disadvantage of previously known separation devices of the type mentioned at the outset is that mostly rinse water, d. H. Fresh water is needed to remove deposits and crusts to avoid in a press water drain area. The drainage performance previously known separators of the type mentioned are often unsatisfied gend, d. H. the discarded residual material is usually still relatively moist and needs one expensive disposal. In addition, there are special conditions at the installation site, because below the drop zone, containers for the removal of the fired where good things can be provided.

The invention has for its object a separation device of the ge named type with increased drainage capacity.

This object is achieved by a separating device with the features of claims 1 or 9 solved.

To achieve the object, a separating device of the type mentioned at the outset has one Counter-conveyor device, by means of which solid against the conveying direction of the Screw conveying direction for increasing the pressure in the compacting zone and / or can be promoted at the solids discharge section, so that the extrusion forces to Aus press liquid or the ejection forces to eject pressed solid Increase material from the separator. The - for example by means of a (motor)  Drive unit driven - counter-conveyor creates a counter pressure in the direction of the solids discharge section by the screw conveyor material. Due to this back pressure, the pumped solid tends to to dodge radially or tangentially with respect to the longitudinal axis of the shaft.

The counter-conveyor does not necessarily have to parallel the solid in opposite directions Feed back or counter-feed to the direction of the conveyor shaft. To increase the press printing in one place, such as in the compacting zone and / or at the festival it is sufficient if the counter-conveying direction with little at least one directional component is directed against the conveying direction.

Just because of the increased pressure, there is already a known pressure Separation devices improved squeezing and thus drainage effect. on Because of the aforementioned radial or tangential forces, it is also possible to press out Material in a new direction - tangential or radial to the axis of the screw conveyor - transport. Because of this, it is possible not only to repress the pressed material to be thrown down or diagonally downwards. The material can - with appropriate additional effort - also from the side, diagonally upwards or vertically upwards be promoted.

This has the advantage that greater freedom for the design of the Ab cutting device are given, since it is not necessarily in every case directly below a container must be parked at the upper end of the screw conveyor.

But also for other reasons, especially with regard to the drainage effect, it may be advantageous to eject the material laterally or upwards. Through the to Ejecting required force, the solid that has already been squeezed out is jammed and due to compressed again by friction and static pressure. The solid also has one longer dwell time inside the machine, which also increases the drainage result improved. The training according to the invention can therefore be used for a subsequent drain achieve.

In addition, due to the counter-conveyor device, even with otherwise conventional Licher design, achieve an improved discharge of the solid.  

According to the invention, however, an improvement in drainage is additional or alternative achievable in that the shaft with or an additional screening surface for ablau fen is provided with liquid discharged or squeezed out of the solid.

If you were to dewater the material through an outer screen jacket, you could due to the pressing effect with the already pressed out further add any solid. This has the disadvantage of being more internal Solid cannot be freed of its liquid despite strong compression. The The invention overcomes this disadvantage, which was discovered for the first time, in that (only or too additionally) the shaft is provided with or a screen surface. This can also be done remove the water or other liquid from the inner solid areas.

Advantageous embodiments of the invention are the subject of the dependent claims.

The shaft is advantageously in the form of a hollow shaft with screen openings and in particular as formed a lower end open tube with sieve openings. According to one particularly preferred embodiment is a connected to the drive shaft or this bil perforated tube, open at the bottom, inside the coil, which is also called Can designate inner screw tube provided. The inner screw tube is in front preferably only within the uppermost area of the conveyor spiral, for example inside half of the top two to five turns. The funding spiral is included attached their turns to the inner screw tube, for example welded, wherein the inner screw tube further preferably as part of the shaft for torque transmission from a drive unit to the conveyor spiral. The inner screw tube enables a drain of the press water from the center of the located in the compacting zone located solid. Incidentally, the pressed solid is in the compacting zone or press zone also often referred to as "press cake". The press water flows through the lower pipe opening, via the spiral cavities or between the spiral exits and the inside of the conveyor pipe back into the lower solid separation zone, where the Solid is separated from the liquid phase on the separation surface. The Press water then flows through the sieve openings located there into the drain the liquid flow. The solids contained in the press water are returned directly held.

Due to the shaft provided with the screen surface according to the invention, in particular for smaller separators with a smaller diameter - to an outer one  Sieve jacket with rinsing device can be dispensed with. Provide one with sieve openings An inner pipe can also be used for drainage results with an outer one Improve the screened separator.

Various counter-conveying devices are conceivable, which are used to increase the Pressure on the press cake are suitable. Since anyway because of the snail Rotary drive is available, counter-conveyor systems with screw conveyor surfaces or screw conveyors or similar axial conveyors, which are a promotion enable axially to an axis of rotation, preferred. One could counter that tion provided screw conveyor surfaces, which are referred to below as the first screw conveyor surfaces are referred to, also coiled or ge in the same direction Design wounds, then counter-promotion by an opposite rotation would be aimed. But if you have at least one screw conveyor surface of the Ge gene delivery device winds in the opposite direction to the delivery helix achieve counter-funding during the run. In particular, the conveyor spiral can then and the screw conveying surface on jointly driven shafts and in particular can also be arranged on the same shaft, which is structurally special is easy to do. In a preferred embodiment, one is common same shaft, designed such that it extends beyond the conveyor helix. The For this purpose, the conveyor spiral ends, for example, before the solids discharge section, while the wave extends beyond. The counter conveyor before seen at least in part in the conveying direction of the conveyor helix behind the festival material discharge section is arranged to ge beyond the solid discharge section Promoting conveyed solids back to the solids discharge section preferably on this shaft, a helical or propeller-shaped Ge gene delivery element - for example a screw conveyor designed for counter-delivery shovel, hereinafter referred to as counter-conveying scoop, or one for counter-conveying formed spiral segment, in the following first spiral segment called - or even more preferably several such counter-conveyor elements - on. The Slope of the first screw conveyor surface of the counter-conveyor can may be constant, but for compacting the solid to be returned it can also be provided that the flank height or axial screw height of the first Screw conveying area seen in the counter-conveying direction reduced.  

Some screw conveyors that remove solids from a solid-liquid Discharge mixture, at least egg for cleaning purposes or for return Part of the solid from time to time, mostly briefly in the "reverse direction" ben, d. H. the spiral conveyor is rotated against its direction of rotation. A disgust Device with a screw conveyor device operated in this way becomes an example as described in WO 93/01000, for the also with regard to special Aus configurations of the invention essential further details, in particular with regard the construction of the conveyor as well as its control, its operation and Ver expressly referenced. In the case of a counter-conveyor that is connected to the För derwelle or its drive is coupled, a reversal of the direction of rotation Conveying the solids detected by the counter-conveyor in the conveying direction effect what is already being conveyed beyond the solids discharge section Solid is undesirable. One for a temporary reverse operation of the screw conveyor The embodiment of the invention adapted to the device therefore sees one of the counterfor the device associated with the conveying element, which also when the conveying helix rotates contrary to the direction of funding for a return of itself in the direction of funding see beyond the compacting zone and / or the solids discharge section Lich solid back to the compacting zone and / or the solids discharge section provides. For example, it would be conceivable to have a device for reversing the inclination of the first screw conveyor surfaces when the direction of rotation of the separating device is reversed provided. This would be constructive but relatively complex and maintenance-intensive. It is there forth preferred that the counter-conveyor device on the one hand at least one with the ge Ge formed in the opposite direction to the first helical screw conveyor surfaces gene conveyor element, the solid when the shaft rotates in the direction of rotation in the opposite direction conveying direction promotes, and on the other hand at least one of these Förderele has elements. The conveying element could, for example, be one with a conveying helix Axial conveyor element provided in the same direction with a second screw conveyor surface his. In a preferred embodiment is on the shaft to form one in two Directions effective counter-conveyor on a wavelength half to the För first spiral spiral segment - in the form of a Half of a screw turn - as a counter-conveying element and on the other shafts along the second half a second screw spiral wound in the same direction as the conveyor spiral segment - in the form of a mirror image of the first screw element half of a screw turn - arranged as a conveying element such that the merging the respective ends into one another so that no material is free  The ends of counter-conveying or conveying elements as seen in the conveying direction ter the counter conveyor can get.

Embodiments of the invention are described below with reference to the accompanying figures explained in more detail. In it shows

Figure 1 is a partially broken away schematic sketchy side view of a first embodiment of a worm at the upper end portion of a conveyor, with which separated solids are discharged from waste water to be treated, trained separator for separating liquid from the solids.

Fig. 2 is a sectional side view of a second embodiment of such a separation device;

Fig. 3 is a section along the line III-III of Fig. 2;

FIG. 4 is a plan view of a screw conveyor shaft used in the separating device according to FIG. 2;

Fig. 5 is a sectional side view of a third embodiment of such a separation device;

Fig. 6 is a section along the line VI-VI of Fig. 5; and

FIG. 7 is a plan view of a screw conveyor shaft used in the separating device according to FIG. 5.

Figs. 1, 2, 3, 5 and 6 show, respectively all or part of a screw conveyor 1 as part of a solid-liquid separation apparatus 30 for the largest possible separation of solids 31 and liquid 18, 32 of a solid-liquid mixture 33rd With the separator 30 z. B. Solids can be separated from waste water. For the general structure of such separation devices 30 provided with screw conveyor devices 1 , express reference is made to DE 42 11 606 C1. The innovation described here is primarily aimed at the apparatus for carrying out a separation of the liquid from the separated solid after the solid has separated out, ie in particular the dewatering of solids filtered from wastewater or from sieved solids. For this purpose, the pressing and discharge area 34 shown separately in FIGS . 2 and 5 - end area of the conveying path - of the separating device 30 is designed as a separating device for separating the liquid from the solid.

The screw conveyor 1 has a housing 2 , a conveyor helix 3 and a shaft 4 . The shaft 4 is connected to the gear unit of a drive unit 5 for rotating the feed spiral 3 .

According to an embodiment shown in FIG. 1, the housing 2 is provided with an ejection tube 6 , through which solid 31 can be ejected from the separation device. The discharge pipe 6 defines a solid discharge section 7 . From the shock tube 6 is arranged laterally and / or upwardly projecting on the housing 2 according to the embodiment shown in FIG. 1.

In the exemplary embodiments shown in FIGS . 2 to 7, instead of the ejection tube 6, a solids discharge section 7 defining the discharge of the solid material 31 downwardly opening discharge opening 6 a in the housing 2 is shown.

As can be seen from FIGS. 2 and 5, the conveyor spiral 3 ends in the conveying direction 8 of the screw conveyor device 1 in front of the solids discharge section 7 . Seen further in the conveying direction 8 , a counter-conveying device 9, which is arranged entirely or for the most part behind the solids removal section 7 , is provided for conveying further conveyed solids in a counter-conveying direction 10 directed against the conveying direction 8 .

According to the exemplary embodiment of FIG. 1, the counter-conveyor device 9 is formed by a screw conveyor with its own drive unit 35, which is designed separately from the shaft 4 and the conveyor helix 3 .

In the embodiments according to FIGS . 2 to 7, on the other hand, the counter-conveying device 9 comprises at least one counter-conveying element extending radially outwards from the shaft 4 in the form of a helically wound counter-conveying scoop 11 or a first worm-spiral segment 19 .

The counter-conveying device 9 has screw conveying surfaces 12 , 21 directed towards the conveying helix 3 , which act similarly to the conveying helix 3 when the counter-conveying device 9 rotates the material attacking it in the counter-conveying direction 10 . On the counter-conveyor elements 11 , 19 in the opposite direction to the Schraubenwen del 3 coiled or convoluted first screw conveyor surfaces 12 are present, which act upon the material attacking it in the counter-conveying direction 10 when the counter-conveyor device 9 rotates in the conveying direction of rotation F of the conveying helix 3 .

The counter-conveyor elements 11 , 19 are firmly seated on the common shaft 4 , so that the counter-conveyor elements 11 , 19 rotate together with the conveyor spiral 3 when driven by the motor drive unit 5 .

In the example shown in Figs. 2 to 4 embodiment, four counter-conveyor acting are feln 11 is provided, but it can also be any other number of article conveying blades 11 may be provided. On the other hand, in the embodiment shown in FIGS . 5 to 7, a first screw spiral segment 19 is provided as a counter-conveying element, together with a second screw spiral element 20 designed and arranged in mirror image to the first screw spiral segment 19 . The second screw spiral segment 20 is provided with a second screw conveying surface 21 , which is coiled or coiled in the same direction as the conveying spiral 3 , so that even when the shaft 4 rotates counter to the conveying direction of rotation F, conveying solid seen in the conveying direction 8 behind the solids discharge section 7 in Ge counter-conveying direction 10 is possible.

The shaft 4 is either itself formed as a hollow tube with sieve openings 13 - inner screw tube 14 -, or the shaft 4 in an embodiment, not shown, has an inner shaft which is covered by a sieve jacket with the formation of drainage channels for press water. In embodiments not shown, the housing 2 is also provided with a screen jacket.

In the illustrated exemplary embodiments, the inner screw tube 14 extends only within the uppermost three turns of the conveying helix 3 , where it is fastened, in particular welded, to the inner screw tube 14 . The inner screw tube thus serves to transmit torque from the motor drive unit 5 (indicated in FIGS . 2 to 7 only by the connecting pin of the shaft 4 to a geared motor) to the feed screw 3 . In embodiments that are not shown, the inner screw tube 14 extends into the lower end region of the screw conveyor device 1 , where it ends openly. At the lower end region of the screw conveyor 1 is in operation the liquid-solid phase or the solid-liquid mixture 33 , from which the solid 31 is immersed in this phase or in this solid-liquid mixture 33 screening screen 36 or grid is separated out and is conveyed out by the screw conveyor 1 .

A compacting zone 15 is formed in the area of the upper end of the conveying helix 3 up to the counter-conveying device 9 , within which conveyed solid can be compressed, so that liquid 18 still contained therein is pressed out.

Due to the above-described special embodiment of the screw conveyor Rich device 1 is an arbitrary orientation of the place or to the discharge opening 6 a optionally be disposed ejection tube 6 possible. It is not only possible to run sideways, but also to arrange it diagonally or directly upwards. It is also conceivable to use flexible ejection paths, for example ejection hoses or hose pipes that also lead to the side or upwards. An exhaust pipe can also be provided with an additional screen surface.

The function of the devices described above is as follows:

On the screening screen 36 separated solids 31 is rich by the screw conveyor device 1 , more precisely by its conveyor helix (s) 3 , up to its upper end area - the pressing and discharge area 34 . There is brought over the solids discharge section 7 also conveyed solid back through the counter-conveyor 9 in Ge counter-conveying direction 10 . The back or counter-conveyed solid thus presses on the solid further conveyed from below by the conveying helix 3 . In this way, the solid located in the compacting zone 15 is compressed and pressed into a press cake 17 and dewatered.

The squeezed liquid - press water 18 - escapes through the surface of the shaft 4 , which is formed as a sieve surface 16 due to the sieve openings 13, and through the cavity of the shaft - through the inside of the inner screw tube 14 - downwards back into the solid-liquid mixture 33 directed. Any residual solids in the press water 18 are flushed up to the solids separation zone, in which solids are separated out from the solid-liquid mixture 33 , where they will again settle, for example, in the separating sieve 36 and be carried out by the screw conveyor 1 .

Due to the opposite conveyance in the directions 10 and 8 , the press cake material has a tendency to move radially outwards, which is indicated by the arrows P. The pressed out solid - - through the discharge pipe 6 or the discharge opening 6 a getrie ben Due to this evasive or ejection forces P, the presscake material. In the discharge pipe 6 , it is jammed due to friction and due to the static pressure and thus further compressed. The backwater also ensures greater compaction in the compacting zone 15 , which in turn leads to further dewatering of the press cake 17 . The material is then fed through the discharge pipe 6 or the discharge opening 6 a to a container 37 ( FIG. 1).

The embodiment shown in FIGS. 5 to 7 is set up for temporary reverse operation of the screw conveyor device 1 . If the shaft 4, for example supply purposes for cleaning or, (not shown) to a solid in an existing in the solids separation zone washing device due rotated counter to the conveying direction of rotation F, so applied not the first screw conveyor surface 12 as in the forward mode but the second screw conveyor surface 21, the fact attacking material in the opposite direction of conveyance 10 . The two screw conveying surfaces 12 , 21 merge into one another at their respective circumferential ends 22 , 23 , as shown in FIG. 7. In this way, ge reaches neither in forward nor in reverse operation in spite of the counter-rotation of the screw segments 19 and 20 material at their circumferential ends past the Ge gene conveying device 9 .

LIST OF REFERENCE NUMBERS SEPARATION DEVICE FOR SEPARATING LIQUID FROM SOLIDS

1

Screw conveyor

2

casing

3

conveying helix

4

wave

5

power unit

6

discharge pipe

6

a discharge opening

7

solids discharge

8th

conveying direction

9

Against conveyor

10

Against the conveying direction

11

Against delivery blades

12

first screw conveying surface

13

screen openings

14

Snails inner tube

15

compacting

16

Screen area

17

press cake

18

press water

19

first spiral segment

20

second helix segment

21

second screw conveying surface

22

front circumferential ends of the spiral segments

23

rear circumferential ends of the spiral segments

30

Solid-liquid separator

31

solid fuel

32

liquid

33

Solid-liquid mixture, especially waste water

34

Press and discharge area

35

Counter-conveyor drive unit

36

Aussonderungssieb

37

Container
F Direction of conveyance
P ejection forces

Claims (13)

1. Separating device for separating liquid ( 18 ) from solids ( 31 ), in particular for separating liquid ( 18 ) from material to be separated, which has previously been separated from a solid-liquid mixture ( 33 ), comprising:
a Schne provided with housing (2), shaft (4) and a conveyor helix (3) ckenfördereinrichtung (1),
a compacting zone ( 15 ), in which solid matter conveyed by the screw conveyor device ( 1 ) is compressed to squeeze out liquid ( 18 ),
a screen surface ( 16 ), in particular at the compacting zone ( 15 ), and
a solids discharge section ( 7 ), on which pressed solid ( 17 ) is guided away from the axis of rotation of the screw conveyor device ( 1 ),
characterized by a counter-conveyor ( 9 ) for conveying solids in at least one directional component of the conveying direction ( 8 ) of the Förderwen del ( 3 ) opposite direction ( 10 ) in such a way that in the Kompaktie tion zone ( 15 ) and / or on Solid discharge section ( 7 ) located solid ( 17 ) is pressurized by the counter-conveyor ( 10 ) so as to increase the squeezing forces for squeezing out liquid or the squeezing forces (P) for pushing out squeezed solid ( 24 ) out of the separating device. 2. Separation device according to claim 1, characterized in that the counter-conveyor ( 9 ) has at least one rotatably arranged first screw benförderfläche ( 12 ). 3. Separating device according to claim 2, characterized in that the at least one first screw conveying surface ( 12 ) is wound in the opposite direction to the conveying helix ( 3 ). 4. Separating device according to one of claims 2 or 3, characterized in that the counter-conveyor ( 9 ) at least one with the in the conveying direction ( 8 ) of the screw conveyor ( 1 ) over the conveyor spiral ( 3 ) extending shaft ( 4 ) of the screw conveyor ( 1 ) or a preferably concentrically arranged there own shaft of the counter-conveyor ( 9 ) for common rotation verbun denes screw-shaped or propeller-shaped counter-conveyor element ( 11 , 19 ), on which the first screw conveyor surface ( 12 ) is formed. 5. Separation device according to one of claims 1 to 4, characterized in
that the conveyor helix ( 3 ) for cleaning purposes and / or for returning solid matter in a solids separation zone, a washing zone, a swirling zone or the like at the beginning of the conveying path of the conveyor helix is counter to the direction of rotation (F) and
that the counter-conveying device ( 9 ) is assigned a conveying element ( 26 , 27 ) which, when the conveying helix ( 3 ) rotates counter to the conveying direction of rotation (F), is seen in the conveying direction ( 8 ) beyond the compacting zone ( 15 ) and / or the solids discharge section ( 7 ) located solids in the direction of the compacting zone ( 15 ) and / or the solids discharge section ( 7 ) promotes, in particular feeds back. 6. Separation device according to claim 5, in particular also according to claim 4, characterized in
that the counter-conveyor ( 9 ) has an axial conveyor, which is connected to the shaft ( 4 ) of the screw conveyor ( 1 ) for common rotation, is preferably designed as such an axial conveyor, and
that the axial conveying device, in addition to a counter-conveying element ( 11 , 12 ) designed in the opposite direction to the conveying helix ( 3 ), in such a way that it conveys solids when the shaft ( 4 ) rotates in the conveying direction of rotation in the opposite conveying direction ( 10 ), also has the conveying element ( 26 , 27 ) which is designed as an axial conveying element ( 26 ) in the same direction as the conveying helix ( 3 ) - in particular screw-shaped or propeller-shaped and with a second screw conveying surface ( 27 ) coiled with the conveying helix ( 3 ). 7. Separation device according to one of claims 2 to 4 and / or according to claim 6, characterized in that the flank height or screw height of one, several or all of the screw conveying surfaces ( 12 ) is constant or seen in the counter-conveying direction ( 10 ). 8. Separating device according to one of claims 1 to 7, characterized in
that the conveyor helix ( 3 ) seen in the conveying direction ( 8 ) ends before the solids discharge section ( 7 ) and / or
that the counter-conveying device ( 9 ), seen in the conveying direction ( 8 ), is arranged behind the solids dispensing section ( 7 ) for counter-conveying or back conveying, seen in the conveying direction ( 8 ), beyond the compacting zone ( 15 ) and / or the solids discharge section ( 7 ) located solid back or back to the compacting zone ( 15 ) and / or to the solids discharge section ( 7 ). 9. Separating device for separating liquid ( 18 ) from solids ( 31 ), in particular for separating liquid ( 18 ) from material to be separated, which has previously been separated from a solid-liquid mixture ( 33 ), comprising:
a, with the housing (2), shaft (4) and a conveyor helix (3) provided with screw conveyor (1, 20)
a compacting zone ( 15 ) in which solid matter ( 17 ) conveyed by the screw conveying device ( 1 , 20 ) is compressed to squeeze out liquid ( 25 ),
a liquid-permeable screen surface ( 16 ), in particular at the compacting zone ( 15 ), and
a solids discharge section ( 7 ), on which pressed solid ( 24 ) is guided away from the axis of rotation of the screw conveyor device ( 1 , 20 ),
characterized in that the shaft ( 4 ) is provided with the screen surface ( 16 ) or at least part of the screen surface ( 16 ) is formed on the shaft ( 4 ). 10. Separating device according to one of claims 1 to 9, characterized in that the shaft ( 4 ) is designed as a hollow shaft with sieve openings ( 13 ) and in particular as a tube ( 14 ) open at a lower end. 11. Separating device according to claim 10, characterized in that the sieve openings ( 13 ) in the entire area or a partial area of the compacting zone ( 15 ) on the shaft ( 4 ), but preferably not in the area of the solids removal section ( 7 ), are formed. 12. Separating device according to one of claims 1 to 11, characterized in that the solids discharge section ( 7 ) with a tangential or radial direction component, in particular in the horizontal direction and / or upwards, from the axis of rotation of the conveyor spiral ( 3 ) extending away Ejection pipe ( 6 ), through which the solid is pressed due to the pressure of the opposing conveyors ( 8 , 10 ). 13. Use of the separating device according to one of claims 1 to 12:

• a) in a solid-liquid separating device ( 30 ) which separates solid from a solid-liquid mixture ( 33 ), in particular in a pressing and discharge area ( 34 ) of such a separating device ( 30 ), for removing any solids present in the separated solids Liquid and / or
• b) for dewatering solids separated from waste water.