Drum screen, solid-liquid separation device and wastewater treatment plant equipped therewith, and solid-liquid separation process

Abstract

Sieve drum device (14) for separating solids from a solid-liquid mixture comprising: a sieve drum (18) which is formed with a sieve jacket (20) and a receiving opening (22) for receiving the solid-liquid mixture into the interior of the sieve drum (18), wherein the sieve jacket (20) is formed with a sieve surface (46) for sieving out solids from the solid-liquid mixture, one or more strip or roller brushes (86) for brushing the sieve jacket (20) from the outside and for loosening solids adhering inside, a rotating device (24) for rotating the sieve drum (18) and a solids removal device (34) for removing solids accumulating inside the screen shell (20) from the screen drum (18), wherein the rotary device (24) has a control which is designed to alternately reverse the direction of rotation of the screen drum, a) wherein the sieve drum (18) is closed at one end (28) and / or b) wherein the solids removal device (34) has a collection trough (70) arranged at least partially inside the screen drum (18) with an upper opening (72) for the insertion of solids from above and for the rinsing of solids from the screen drum (18).

Description

[0001] The invention relates to a sieve drum device for separating solids from a solid-liquid mixture comprising: a sieve drum which is designed with a sieve shell and a receiving opening for receiving the solid-liquid mixture into the interior of the sieve drum, wherein the sieve shell is designed with a sieve surface for sieving out solids from the solid-liquid mixture, a rotating device for rotating the sieve drum and The invention relates to a solids removal device for removing solids accumulating inside the screen drum. It further relates to a solids-liquid separation device equipped with such a screen drum device. The invention also relates to a wastewater treatment plant equipped with such a device. Finally, the invention relates to a separation process that can be carried out with such a screen drum device.

[0002] Such screening drums and screening drum devices, which are used, for example, in wastewater treatment to separate solids from wastewater, are known from the following publications: • Company brochure “ROTAMAT® screening plant Ro 2 / RPPS” from Huber SE with the print mark 0.2 / 8-4.2014-4.2004 • Company brochure “HUBER Fine Screen Drum RoMesh®” with the print mark 0.15 / 5-4.2012-8.2004 • HUBER Report - Practical Reports: “HUBER expands its machine program with another fine screening machine”, website http: / / www.huber.de / de / huber-report / praxisberichte / rechen-und-sieb...”, downloaded on May 12, 2016; • Company brochure ROTO-SIEVE 13-51 of the company ROTO-SIEVE AB, date of printing unknown.

[0003] German patent DE 3432811 A1 also discloses a rotary sieve for separating liquids and solids. A sieve drum has four lifting rungs arranged at equal intervals around the circumference of the drum, as well as a collection trough to collect solids that fall from the lifting rungs.

[0004] DE 103 02 494 B3 discloses a device for removing screen material from liquid flowing in a channel. The device has an inclined screen frame with guide plates and a screw conveyor with a feed hopper.

[0005] A rotary screen for removing solids from wastewater is known from GB 2 241 905 A. The rotary screen has wedge-shaped, circumferential wires and a chute for collecting the solids, the chute having a rake for removing solids from the wires.

[0006] A rotary sieve with angled guide plates is known from GB 2 314 032 A.

[0007] WO 96 / 30 102 A1 describes a drainage device with a rotary screen and a channel extending in a longitudinal direction of the rotary screen, with a feed screw.

[0008] According to this, drum screening plants in various designs are state of the art, see the aforementioned prospectus documents.

[0009] The known systems have conveying devices for the screened material that pass through the drum or spiral conveyors attached to the inner wall of the drum, which convey the retained material towards the end of the drum.

[0010] The disadvantages of the known machines are: Relative movements or scraping processes break down already sieved materials, allowing them to escape again through the sieve holes or slits. The problem is that especially finely ground microfibers and Cellulose particles tend to re-link themselves. Undesirable braiding in downstream equipment is a frequent consequence.

[0011] Particularly in wastewater treatment plants, significant problems with so-called "clumps" frequently occur. These clumps have increased sharply in recent years, which can be attributed to changing hygiene habits among the population. Microfiber cloths, solid cellulose wipes from the care sector, and moist toilet paper are the primary causes of this problem.

[0012] Another disadvantage of the known drum screen systems with passages on both ends is that, for flow-related reasons, the fluid level in the drums cannot be too high, which limits the throughput capacity.

[0013] The object of the invention is therefore to improve a sieve drum device of the type mentioned at the outset in such a way that it is simple in design and yet has improved sieving performance, in particular with regard to throughput and / or avoidance of braiding.

[0014] This problem is solved by a sieve drum device according to claim 1.

[0015] Advantageous embodiments are the subject of the dependent claims.

[0016] Advantageous uses are specified in the further claims.

[0017] According to a first aspect, the invention provides a sieve drum device for separating solids from a solid-liquid mixture comprising: a sieve drum which is designed with a sieve shell and a receiving opening for receiving the solid-liquid mixture into the interior of the sieve drum, wherein the sieve shell is designed with a sieve surface for sieving out solids from the solid-liquid mixture, one or more strip or roller brushes for brushing the screen casing from the outside and for loosening solids adhering to the inside, a rotary device for rotating the sieve drum, wherein the rotary device has a control designed to alternately reverse the direction of rotation of the sieve drum and a solids removal device for removing solids that accumulate inside the screen shell from the screen drum.

[0018] According to an alternative, the sieve drum is designed to be closed at at least one end.

[0019] According to another alternative, the solids removal device has a collection trough located at least partially inside the screen drum, with an upper opening for the insertion of solids from above and for rinsing the solids out of the screen drum.

[0020] It is preferred that at least one guide bar, extending inwards with at least one directional component in the direction of the axis of rotation, projects on the inside of the sieve shell in order to transport the solid material accumulating on the inside upwards in the circumferential direction.

[0021] It is preferred that several guide rails are provided.

[0022] It is preferred that several guide strips are distributed around the circumference.

[0023] It is preferred that at least one guide strip has a scoop-like profile, in particular bent or angled, in order to transport liquid upwards to above the upper opening of the collection tray.

[0024] It is preferred that several shovel-shaped guide vanes with opposite shovel directions are provided.

[0025] It is preferred that at least one guide strip is designed as a guide plate.

[0026] It is preferred that the receiving opening is provided at a first end face of the sieve drum and that the sieve drum is completely closed at the opposite second end face.

[0027] It is preferred that the upper opening of the collection tray is arranged above the axis of rotation of the sieve drum.

[0028] It is preferred that the collection tray has a drain pipe for the solids to be flushed out.

[0029] It is preferred that the collection basin has an inner bottom surface inclined towards a drain for the solids to be flushed out.

[0030] It is preferred that the solids removal device includes a solids transport device formed outside the screen drum, which is connected to a drain of the collection trough to receive and transport away flushed-out solids.

[0031] It is preferred that the transport device includes a liquid separation device for separating liquid from the discharged solid.

[0032] It is preferred that the transport device has a screw with a sieve surface, wherein sieve openings of the sieve surface are smaller than sieve openings of the sieve shell.

[0033] It is preferred that the axis of rotation of the sieve drum is horizontal or substantially horizontal.

[0034] According to another aspect, the invention provides a solid-liquid separation device for separating solids from liquids in the context of wastewater treatment, comprising a screen drum device according to one of the preceding embodiments and a housing for receiving the screen drum or a channel through which the solid-liquid mixture flows and into which the screen drum is inserted.

[0035] According to another aspect, the invention provides a wastewater treatment facility, in particular a sewage treatment plant, comprising a screen drum device or a solid-liquid separation device according to one of the preceding embodiments.

[0036] According to a further aspect, the invention provides a method for separating solids from a solid-liquid mixture comprising: feeding the solid-liquid mixture into a sieve drum having a sieve shell; rotating the sieve drum to transport solids accumulated on the inside of the sieve shell upwards; brushing the sieve shell from the outside and loosening solids adhering to the inside with one or more bar or roller brushes; dropping the solids into a liquid-tight collection tray; flushing the solids out of the collection tray; and intermittently changing the direction of rotation of the sieve drum.

[0037] Preferably, the method is carried out using a sieve drum device according to one of the preceding embodiments.

[0038] A particularly preferred embodiment of the invention proposes a drum sieve system designed for the gentle separation of fine and fibrous solids from a liquid-solid mixture.

[0039] Preferably, an internally fed sieve drum is provided, which is partially open on the inlet side and completely closed on the opposite side.

[0040] Preferably, the screen drum, which is fed from the inside, can optionally be fed under pressure, e.g., via pumps. In this case, the screen drum housing can be completely enclosed.

[0041] The internally fed screen drum can optionally also be used in gravity flow, directly in the fluid stream. In this case, it can be completely or only partially immersed in the fluid stream. The screen drum housing is open at its lowest point (e.g., housing without a bottom plate).

[0042] Preferably, a collection tray for the screened material is provided in the center of the screen drum, extending the length of the screen drum in the inner direction and being open at the top. Preferably, the upper, open area of ​​the collection tray is higher than the central axis of the drum.

[0043] Preferably, the collection tray is closed at the end and has a rectangular or round drain pipe at the front. The bottom of the collection tray preferably slopes towards the drain pipe.

[0044] The screening drum device preferably comprises several guide rails, e.g., guide plates, attached to the screening surface in the longitudinal direction of the screening drum. These guide plates ensure that the screened material falls in a controlled manner into the collection tray below in the segment between two guide plates.

[0045] Preferably, the guide strips / baffles are angled or curved. Angled or curved guide strips / baffles ensure that a certain proportion of the liquid in the drum is discharged upwards to the discharge point.

[0046] The shape of the guide plates then acts similarly to a scoop. Upon reaching the deflection point, the liquid falls into the collection tray, causing the material in the tray to drain towards the tray's outlet.

[0047] Preferably, one or more spray nozzles are mounted longitudinally across the outside of the drum. These spray nozzles are preferably designed such that the material adhering to the inside of the screen surface is sprayed into the material collection tray. The sprayed water preferably also serves as a transport medium for the material in the screen tray, for example, towards a drain pipe.

[0048] In particular, the screen drum device comprises one or more strip or roller brushes, which are preferably mounted longitudinally across the outside of the drum. These are preferably designed such that the brush bristles pierce the screen drum holes or slots from the outside in. Material lodged in the screen drum holes or slots is pressed into the screenings collection trough.

[0049] In particular, the direction of rotation of the sieve drum is changed at intervals. This ensures that the bristles do not permanently bend in one direction, but are straightened again and again.

[0050] "Felting" caused by long-fiber components, such as hair and cords, is also avoided by frequently changing the direction of rotation.

[0051] In a preferred embodiment of the sieve drum device, the sieved material adhering to the inner surface of the sieve basket is gently discharged and cannot re-enter the process fluid flow in the area where mechanical stress is exerted by spray nozzles or brushes.

[0052] This screened material falls into the collection trough and flows out of the trough, preferably into a separate separation device that separates the liquid from the liquid-solid mixture, or into the intake of a pump. For example, the solid-liquid mixture can be conveyed by pump and pressure line to a more distant screening material treatment plant, such as a belt press, centrifuge, sludge basin, etc.

[0053] According to a further advantageous embodiment, the liquid-solid separation device can also have an independent screen screw with integrated screen press, directly flanged to the outlet pipe of the screenings collection trough.

[0054] According to one embodiment, the material separation device is connected to the discharge pipe of the trough, for example, by means of a rotatable flange. Preferably, a helical or screw screen is connected to the rotatable flange. This screen preferably has a perforated or slotted screen at its lowest point. Preferably, the screen openings should be smaller than or equal to the screen openings of the drum screen. The screen at the lowest point of the screen shells of the material separation and discharge device is preferably cleaned by means of brushes located on the flanks of the screw conveyor. Since the material is mechanically stressed by the brush cleaning and can escape through the screen openings in a comminuted state (and is thus a braiding material), the discharge from the screen zone is preferably fed back into the fine screen drum.

[0055] The filtrate from the screen material separation device is preferably screened again and does not enter the downstream system components directly.

[0056] According to a preferred embodiment, the screening material separation and discharge device can be mounted vertically or at an angle on the discharge pipe of the screening material collection trough due to the rotating flange. This allows for a variable discharge point of the material to be discharged. Easy adaptation to containers or conveying systems is ensured.

[0057] To obtain enough liquid for a pumpable material, the guide plates can also be designed as scoops.

[0058] Exemplary embodiments of the invention are explained in more detail below with reference to the accompanying drawings. These show: Fig. 1 a partially sectioned solid-liquid separation device for separating solids from liquids with a sieve drum device and a housing; Fig. 2 a partially cut-away side view of the solid-liquid separation device for separating solids from liquids seen from the right in Fig. 1; Fig. 3 a longitudinal section through the solid-liquid separator according to the Fig. 1 and Fig. 2 in a stand-alone training program; Fig. 4 a cross-section through the solid-liquid separation device when used in a channel through which the solid-liquid mixture to be treated flows; Fig. 5 the solid-liquid separator of Fig. 4 in longitudinal section; Fig. 6. Another embodiment of the solid-liquid separation device with a different configuration of a solid removal device for removing the solids screened out by the sieve drum device; and Fig. 7 A photograph of a sieve drum of the sieve drum device as seen from an incoming viewpoint.

[0059] In the Fig. 1, Fig. 2, Fig. 3, Fig. 4, Fig. 5 to Fig. Figure 6 shows different embodiments of a solid-liquid separation device 10 for separating solids from liquids, which differ in their application and the design of a transport device 12 for transporting solids. The solid-liquid separation device 10 has a screen drum device 14 and a housing 16 for this purpose. The screen drum device 14 has a screen drum 18, which is designed with a screen jacket 20 and a receiving opening 22 for receiving the solid-liquid mixture into the interior of the screen drum 18. A photograph of the preferred screen drum 18, and in particular its interior, is shown in Figure 6. Fig. 7 shown.

[0060] The following will be based on the representation in the Fig. 1, Fig. 2 and Fig. 7 First, the general structure of preferred embodiments of the solid-liquid separation device 10 and its sieve drum device 14 is explained, before special adaptations to different types of application are explained in more detail with reference to the remaining figures.

[0061] The sieve drum device 14 therefore comprises the sieve drum 18, a rotary device 24 for rotating the sieve drum 18 and a solids removal device 34 for removing solids accumulating inside the sieve shell 20 from the sieve drum 18.

[0062] The sieve drum 18 is cylindrical and has the sieve shell 20 and an open inlet 26 at a first end face 27. At the second end face 28 opposite the inlet 26, the sieve drum 18 is closed.

[0063] The sieve drum 18 has, in particular at its first end face 18, a stiffening ring 30 to which the sieve shell 20 is attached, and on which the sieve drum 18 is supported in a bearing assembly 32. At its second end face 28, the sieve drum 18 is closed with a cover 36, which has a closed disc 38 and an annular support flange 40 to which the sieve shell 20 is attached, and on which the sieve drum 18 is supported in a further bearing assembly 32. A shaft 42 is provided on the outside of the disc 38 in a rotationally fixed manner, and the rotary device 24 for driving the rotary motion of the sieve drum 18 engages with this shaft.

[0064] The sieve jacket 20 is designed with a sieve surface 46 for sieving solids from the solid-liquid mixture. For this purpose, the sieve jacket 20 is formed, for example, from a perforated sheet 48 with, for example, round holes as sieve openings 50, or, in embodiments not shown in detail, from a sieve grid made of longitudinal and transverse struts.

[0065] Inside the sieve drum, several guide bars 52 extending longitudinally through the sieve drum 18 are provided, projecting inwards from the sieve surface.

[0066] The guide strips 52 are designed in the form of guide plates and are angled or bent in profile, so that they are provided with a scoop-shaped cavity 54, similar to scoop strips or paddle strips. In the illustrated embodiment, two adjacent strips are aligned with their cavity openings relative to each other.

[0067] The guide bars 52 are aligned with at least one directional component in the direction of the central axis of the screen drum 18, which acts as the axis of rotation, and in particular parallel to the central axis. When the screen drum 18 rotates, the material adhering to the screen surface – solids – is moved circumferentially. As the guide bar 52 moves upwards, it serves as a discharge chute for the solids, guiding and discharging them into the solids discharge device 34.

[0068] The scoop-shaped design also transports liquid in the circumferential direction. Due to the different orientations of the scoop-like cavities 54, the first guide bars act as scoops when the screen drum 18 rotates in one direction, and the second guide bars, oriented in the opposite direction, act as scoops when the screen drum rotates in the other direction.

[0069] The rotary device 24 has a first bearing device 32 for supporting the lifting ring 30 and a second bearing device 32 for supporting the support flange 40 and a rotary drive 56.

[0070] The bearing assemblies 32 are identical, so only one of them is shown in the drawings. They comprise a chain 58 or a circular arc, which is suspended from a positionally adjustable suspension 60 inside the housing 16 and on which several rollers 62 are rotatably mounted, on which the screen drum 18 rolls with its bearing surfaces at the respective end faces 27, 28. The bearing assemblies 32 are arranged at the same height. The axis of rotation of the screen drum 18 is oriented in a horizontal direction.

[0071] The rotary drive 56 comprises an electric motor 64 with a control unit 66, which is designed to reverse the direction of rotation of the sieve drum 18 from time to time. The output shaft of the electric motor 64 is connected to the shaft 42 of the sieve drum 18 via a chain drive 68.

[0072] The solids removal device 34 has a collection trough 70 for receiving and rinsing the solids from the screen drum 18 and the transport device 12 for conveying the solids washed out of the collection trough 70.

[0073] The collection tray 70 is formed from a liquid-tight wall 74 and is trough-shaped, open at the top, i.e., with an upper opening 72. The collection tray 70 extends lengthwise through the screen drum 18. The edge of the upper opening 72 is located above the central axis of the screen drum. The upper opening 72 is designed such that solid material transported upwards by the guide rails 52 can be discharged into the upper opening 72 when the screen drum 18 rotates.

[0074] The collection tray 70 can be funnel-shaped. The bottom 76 of the collection tray 70 is designed as a channel and / or slope to flush the solids towards a drain 78 of the collection tray 70.

[0075] The collection trough 70 contains no other active transport units, i.e., no augers, buckets, or the like. The removal of the solids deposited in the collection trough 70 occurs solely through flushing.

[0076] In one embodiment, liquid is scooped upwards by means of the guide rails 52 and discharged together with the solids. In another embodiment, a liquid inlet 80 is provided for filling with leaching liquid. Preferably, both measures are provided.

[0077] In the illustrated embodiment, the sieve drum device 14 has spray nozzles 82 above the sieve drum 18, which spray the sieve shell 20, e.g., from the outside, and spray off solids adhering to the inside in order to discharge them into the collection tray 70. The spray nozzles 82 simultaneously serve as the liquid inlet 80. The spray nozzles 82 are provided, for example, on several spray nozzle strips 84, which extend axially above the sieve drum 18, each laterally offset from the center outwards, but above the upper opening 72.

[0078] Furthermore, 12 brushes 86 are provided at the upper part of the screen drum device, which brush the screen shell 20 from the outside and also contribute to the removal of solids adhering inside. The brushes 86 are arranged, for example, on brush strips 88 that extend axially above the upper opening 72. In an embodiment not shown, brush rollers are provided.

[0079] In the illustrated embodiment, the collection tray 70 is attached to the inner wall of the housing 14, which faces the first open end 27 of the screen drum 18, and extends into the screen drum 18 through this open end 27. The drain 78 is also located on this front wall 90 of the housing 14 and is designed, in particular, as a drain pipe.

[0080] The transport device 12 receives the flushed-out solids and the flushing liquid at the outlet 78 of the collection basin 70.

[0081] In one embodiment, the transport device 12 is equipped with a liquid separation device 91 to separate the liquid from the washed-out solids. For this purpose, in the embodiment of the Fig. 1, Fig. 2, Fig. 3, Fig. 4 to Fig. 5 A sieve surface 92 is provided on a transport pipe 94. Liquid exiting there is returned to the inlet in front of the sieve drum 18.

[0082] In this embodiment, the transport pipe 94 is, for example, vertically oriented and internally equipped with a screw conveyor (not shown) for transporting the solids upwards. This screw conveyor can be driven by a screw drive 98 with an electric motor 100. The solids can thus be conveyed to the area above a container 110 and discharged into the container 110 via a discharge chute 112. Preferably, the transport pipe 94 is attached to the discharge pipe by means of an annular flange, so that it can be mounted on the housing 16 in a selectable orientation and thus adapted to the local situation for the removal of the solids.

[0083] In the design of the Fig. 6 is a modification of the transport device 12, a pump 102 for pumping the solids and the floating liquid through a transport pipe 104 in order to supply this solid-liquid mixture, for example, to a washing press (not shown) for washing and pressing out the screened material or other configurations of separate liquid separation devices 91.

[0084] In the design of the Fig. 1, Fig. 2 to Fig. 3. The housing 14 is designed as a closed housing, which stands freestanding, e.g., in a room of a wastewater treatment plant, and is fed under pressure to the solid-liquid mixture via an inlet 96 in the form of a pipe. The liquid, freed from solids by the screen drum 18, is fed via an outlet 106, here also designed as a pipe leading out of the housing 14, to further processing, e.g., a biological treatment stage.

[0085] In the design of the Fig. 4, Fig. 5 to Fig. In Figure 6, the solid-liquid separator 10 is inserted into a channel 108, through which, for example, wastewater is fed to a wastewater treatment plant (e.g., a sewage treatment plant). The housing 14 is designed to be open in such a way that the solid-liquid mixture to be treated, e.g., wastewater, can flow in at the inlet 96, and the liquid exiting the screen jacket 20 can continue to flow in the channel 108 at the outlet 106. Reference symbol list: 10 Solid-liquid separator 12 Transport equipment 14 Sieve drum device 16 cases 18 sieve drum 20 sieve jacket 22 Intake opening 24 Rotary device 26 open inbound 27 first end face 28 second end face 30 stiffening ring 32 Storage facility 34 Solid material removal system 36 lids 38 disc 40 Support flange 42 wave 46 sieve area 48 perforated sheet metal 50 sieve openings 52 guide rails 54 cavity 56 Rotary drive 58 (carrying) chain of the storage facility 60 Suspension 62 rolls 64 Electric motor (sieve drum) 66 Control 68 chain drives 70 Collection tray 72 upper opening 74 wall 76 Floor 78 Drain 80 Liquid inlet 82 Spray nozzle 84 spray nozzle strip 86 brush 88 Brush strip 90 front wall of the housing 91 Liquid separator 92 sieve area 94 Transport pipe 96 inflows 98 worm drive 100 Electric motor (worm gear) 102 Pump 104 Transport pipe 106 Procedure 108 channels 110 containers 112 Discharge chute

Claims

A sieve drum device (14) for separating solids from a solid-liquid mixture, comprising: a sieve drum (18) formed with a sieve shell (20) and a receiving opening (22) for receiving the solid-liquid mixture into the interior of the sieve drum (18), wherein the sieve shell (20) is formed with a sieve surface (46) for sieving solids from the solid-liquid mixture; one or more strip or roller brushes (86) for brushing the sieve shell (20) from the outside and for loosening solids adhering to the inside; a rotary device (24) for rotating the sieve drum (18); and a solids removal device (34) for removing solids accumulating inside the sieve shell (20) from the sieve drum (18), wherein the rotary device (24) has a control configured to to alternate the direction of rotation of the sieve drum,a) wherein the screen drum (18) is closed at one end (28) and / or b) wherein the solids removal device (34) has a collection trough (70) arranged at least partially inside the screen drum (18) with an upper opening (72) for feeding the solids in from above and for rinsing the solids out of the screen drum (18). Sieve drum device according to claim 1, characterized in that several scoop-shaped guide strips (52) extending at least with one directional component in the direction of the axis of rotation are distributed around the circumference on the inside of the sieve shell (18) and project inwards with opposite scoop direction in order to transport the solid material accumulating on the inside of the sieve shell (20) upwards in the circumferential direction. Sieve drum device according to claim 2, characterized by at least one or all of the following features: that the guide bars (52) are designed in a scoop-like profile in order to transport liquid upwards to above the upper opening (72) of the collection trough (70); that the guide bars (52) are each designed as a guide plate. Sieve drum device according to one of the preceding claims, characterized in that the receiving opening (22) is provided at a first end face (27) of the sieve drum (18) and that the sieve drum (18) is completely closed at the opposite second end face (28). Screen drum device according to one of the preceding claims, characterized by at least one, several or all of the following features: that the upper opening (72) of the collection trough (70) is arranged above the axis of rotation of the screen drum (18); that the collection trough (70) has a drain pipe for the solids to be flushed out; that the collection trough (70) has an inner bottom surface inclined towards a drain for the solids to be flushed out; Screen drum device according to one of the preceding claims, characterized in that the solids removal device (34) has a transport device (12) for solids formed outside the screen drum (18), which is connected to a drain of the collection trough (70) to receive and transport washed-out solids. Sieve drum device according to claim 6, characterized in that the transport device (12) has a liquid separation device for separating liquid from the washed-out solid. Sieve drum device according to one of claims 6 or 7, characterized in that the transport device (12) has a screw with a sieve surface (92), wherein sieve openings of the sieve surface (92) are smaller than or equal to sieve openings of the sieve shell (20). Sieve drum device according to one of the preceding claims, characterized in that the axis of rotation of the sieve drum (18) is horizontally or substantially horizontally aligned. Solid-liquid separation device (10) for separating solids from liquids in the context of wastewater treatment, comprising a screen drum device (14) according to one of the preceding claims and a housing (16) for receiving the screen drum (18) and / or a channel (108) through which the solid-liquid mixture flows and into which the screen drum (18) is inserted. Wastewater treatment device or sewage treatment plant comprising a screen drum device (18) according to any one of claims 1 to 9 or a solid-liquid separation device (10) according to claim 10. A method for separating solids from a solid-liquid mixture comprising: feeding the solid-liquid mixture into a screen drum (18) having a screen shell (20); rotating the screen drum (18) to transport solids accumulated on the inside of the screen shell (20); brushing the screen shell (20) from the outside and loosening solids adhering to the inside with one or more strip or roller brushes (86); dropping the solids into a liquid-tight collection tray (70), flushing the solids out of the collection tray (70), and intermittently changing the direction of rotation of the screen drum. Method according to claim 12, characterized by using a sieve drum device (14) according to one of claims 1 to 9.

Images