Treatment device and method

Abstract

Treatment device (10) for treating a mixture formed at least from a liquid, organic solids and inorganic, mineral solids, in particular for separating inorganic, mineral solids contaminated with organic solids from a liquid, comprising a container (11) for receiving the mixture, which container is designed to taper in a funnel-shaped manner in a direction (18) of a longitudinal axis (12) of the container, wherein the container has an upper region (13) in which an inlet (16) of the treatment device, located outwardly in a radial direction (42) relative to the longitudinal axis, is provided for tangentially introducing the mixture into the container and an outlet (17) of the treatment device is provided for discharging the liquid containing the organic solids from the container,a central region (14) arranged adjacent to the upper region in the direction of the longitudinal axis and a lower region (15) arranged adjacent to the central region in the direction of the longitudinal axis for forming a sediment (19) from the inorganic, mineral solids, and a discharge device (33) connected to the lower region for discharging the inorganic, mineral solids forming the sediment, wherein, the treatment device comprises a sleeve (20) arranged in the upper region, extending in the direction of the longitudinal axis, forming a guide device and open on both sides, which is designed to guide the mixture introduced into the container through the inlet between an outer wall (21) of the sleeve and an inner wall (22) of the container from the upper region to the middle region, characterized by that the sleeve is further configured to guide the liquid containing the organic solids through an interior space (24) of the sleeve, which is delimited by an inner wall (23) of the sleeve, for discharge from the drain from the central region to the upper region, wherein the sleeve, with an end (25) of the sleeve located opposite to the direction of the longitudinal axis, lies in a liquid-tight manner in the radial direction on the outside against the inner wall of the container.

Description

The invention relates to a treatment device and a method for treating a mixture formed at least from a liquid, organic solids and inorganic mineral solids, in particular for separating inorganic mineral solids contaminated with organic solids from a liquid, comprising a container for receiving the mixture, which container is formed so as to taper like a funnel in a direction of a longitudinal axis of the container, wherein the container comprises an upper region in which an inlet of the treatment device, which inlet is located on the outside in a direction radial with respect to the longitudinal axis, is provided for tangentially introducing the mixture into the container and an outlet of the treatment device for discharging the liquid substantially containing the organic solids from the container, a central region arranged adjacent to the upper region in the direction of the longitudinal axis and a lower region arranged adjacent to the central region in the direction of the longitudinal axis for forming a base set consisting essentially of the inorganic mineral solids, and a discharge device connected to the lower region for discharging the inorganic mineral solids forming the base set, wherein the treatment device comprises a sleeve which is arranged in the upper region and extends in the direction of the longitudinal axis and forms a guide device and is open on both sides and is configured to guide the mixture introduced into the container through the inlet between an outer wall of the sleeve and an inner wall of the container from the upper region to the central region.A treatment device of the type mentioned at the beginning is sufficiently known from the prior art and is used, for example, in wastewater cleaning installations in the form of a sand classifier or sand washer in order to separate sand contaminated with organic solids from a sand-water mixture. The sand-water mixture is introduced into the container by means of the inlet. By a guided path in the container, the organic solids are kept suspended and fed to the path while the sand in the container sedimentes. The sand is subsequently dewatered from the container and discharged by means of the discharge device. While the task of a sand classifier is regularly limited to separating the sand and discharging it as dry as possible, a sand scrubber regularly has the additional task of treating the sand in order to reduce a proportion of the organic solids contained in the sand. In this case, the sedimented sand in the container is separated from residual organic solids in an upflow method, for example with addition of water, by means of a stirring device.The treatment devices known from the prior art are regularly designed for a deposition rate of 95% for a grain size of 200 μm and greater. Such a separation efficiency is often not sufficient in practice, since the sand introduced into a wastewater treatment plant can also have a grain size of less than 200 μm. Sand threads which are regularly arranged upstream of the treatment devices have therefore already been improved to a separation efficiency of 95% for a grain size of approximately 100 μm and greater. Thus, there is a need to design the treatment devices likewise to a deposition capacity of 95% for a grain size of approximately 100 μm and larger. It is known that this improved separation efficiency can be achieved by reducing a feed quantity by a factor of 5 to 6. Consequently, a treatment device which has been designed for a deposition rate of 95% for a grain size of 200 μm and greater at a feed rate of 30 1 / s would have to be charged with a feed rate of 5 1 / s in order to achieve an improved deposition rate of 95% for a grain size of approximately 100 μm and greater. Such a reduction of the feed quantity is disadvantageous, however, and frequently even not possible at all in the known treatment devices.Furthermore, DE 197 29 802 C2 discloses a treatment device which additionally comprises a spiral guide device which is arranged in the upper region of the container and extends in the direction of the longitudinal axis and is configured to guide the mixture from the inlet to a funnel-like outlet channel of the treatment device which is connected to the outlet and forms an overflow weir and is arranged centrally in the upper region, coaxially with the longitudinal axis. The guide device is arranged on a mixture surface or liquid surface. By means of the guide device, floating substances are to be guided in a direction of the outlet centrally arranged in the upper region, a separation performance of the treatment device is to be improved and a direct flow of the mixture in a direction of the outlet channel or of the overflow weir centrally arranged in the upper region is to be prevented.It is disadvantageous in the treatment device known from the prior art that the mixture flows into the container at a comparatively high flow speed, which ensures strong turbulences and thus makes it difficult to separate the sand. Furthermore, the likewise centrally arranged outlet connected to the outlet channel arranged centrally in the upper region also constitutes a source of interference which additionally ensures comparatively large turbulences which make the separation of the sand difficult. In addition, a length of the overflow weir is comparatively short, due to the central arrangement and the funnel-like configuration, which leads to a comparatively large overflow height or weir edge loading and thus to a comparatively high flow speed in a region in front of the overflow weir. A position and length of the overflow weir is therefore not selected to be optimum. Moreover, it has been found in practice that the spiral-shaped design of the guide device is disadvantageous because the mixture after introduction into the container flows for the most part in the container in the radial direction outwards downwards in the direction of the longitudinal axis to the central region and the liquid containing the organic solids then flows in the central region inwards in the radial direction, counter to the direction of the longitudinal axis, to the upper region and the overflow weir.DE 199 53 961 A1 and DE 195 01 034 A1 each disclose a treatment apparatus of the essentially generic type. The object of the present invention is therefore to propose a treatment device and a method for treating a mixture formed at least from a liquid, organic solids and inorganic, mineral solids, which treatment device overcomes the disadvantages of the treatment devices known from the prior art and enables an improved separation performance to be achieved.This object is achieved by a treatment apparatus having the features of claim 1 and a method having the features of claim 15.The treatment device according to the invention for the treatment of a mixture formed at least from a liquid, organic solids and organic mineral solids, in particular for the separation of inorganic mineral solids contaminated with organic solids from a liquid, comprises a container for receiving the mixture, which is formed so as to taper like a funnel in a direction of a longitudinal axis of the container, wherein the container comprises an upper region in which an inlet of the treatment device, which inlet is located on the outside in a direction radial with respect to the longitudinal axis, is provided for the tangential introduction of the mixture into the container and an outlet of the treatment device for the discharge of the liquid substantially containing the organic solids from the container, a central region arranged adjacent to the upper region in the direction of the longitudinal axis and a lower region arranged adjacent to the central region in the direction of the longitudinal axis for forming a sediment substantially from the inorganic mineral solids, and a discharge device connected to the lower region for discharging the inorganic mineral solids forming the sediment, wherein the treatment device comprises a sleeve which is arranged in the upper region and extends in the direction of the longitudinal axis and forms a guide device and is open on both sides and is configured to be configured to, the mixture introduced into the container through the inlet between an outer wall of the sleeve and an inner wall of the container from the upper region to the middle region, and the liquid containing the organic solids to be guided, traversing an inner space bounded by an inner wall of the sleeve, for discharge from the outlet from the middle region to the upper region, wherein the sleeve bears against the inner wall of the container on the outside in the radial direction with an end of the sleeve opposite the direction of the longitudinal axis.According to the invention, a sleeve which is open on both sides and forms a guide device is thus provided in the upper region, which sleeve is configured to guide the mixture introduced into the container through the inlet between an outer wall of the sleeve and an inner wall of the container from the upper region to the central region. As a result, a flow of the mixture can be equalized between the outer wall of the sleeve and the inner wall of the container and a flow velocity of the mixture can be reduced, whereby disadvantageous turbulences, which make it difficult to separate the inorganic mineral solids, can be avoided. In other words, a region of the container formed between the outer wall of the sleeve and the inner wall of the container can form a kind of stilling region for the mixture introduced into the container, so that the mixture can subsequently flow at a reduced flow speed in the direction of the longitudinal axis downwards into the central region of the container. In the central region, the liquid containing the organic solids can distribute over an entire diameter of the central region counter to the direction of the longitudinal axis above the sediment or the sedimented inorganic mineral solids, in particular sand. Subsequently, the liquid containing the organic solids can flow uniformly upward in the middle region in the radial direction inward, counter to the direction of the longitudinal axis, toward the upper region. At the same time, the sleeve is configured to guide the liquid containing the organic solids for discharge from the outlet from the central region to the upper region, wherein the liquid containing the organic solids traverses an interior space of the sleeve bounded by the inner wall of the sleeve. Furthermore, the sleeve can prevent a direct flow of the mixture from the inlet in a direction of the outlet and can separate the mixture flowing radially outwards downwards in the direction of the longitudinal axis from the liquid flowing radially inwards counter to the direction of the longitudinal axis upwards and containing the organic solids. As a result, the guide device adapted to an actual flow behavior of the mixture or of the liquid containing the organic solids therefore ensures that turbulences and comparatively high flow speeds of the mixture or of the liquid containing the organic solids can be avoided, so that a separation performance of the treatment device can be substantially improved.The mixture can be, in particular, a sand-water mixture. The inorganic mineral solids can be sand in particular.The discharge device can comprise a discharge screw and a drive means. By means of the discharge screw, the inorganic, mineral solids can be dewatered from the container and discharged. Furthermore, the discharge device can have, preferably at the end, a discharge channel by means of which the inorganic, mineral solids can be discharged. Below the ejection channel, a collecting container for receiving the inorganic mineral solids cleaned from the organic solids can be arranged. To separate residual organic solids, a liquid, in particular water, can additionally be added to the inorganic mineral solids forming or sedimented the sediment, which liquid can pass into the middle region of the container via a further inlet of the treatment device arranged in the middle region of the container.The container may be arranged on a frame.Owing to the tangential introduction of the mixture into the container, turbulences can additionally be avoided.The inlet may have an inlet flange. Furthermore, the outlet can have an outlet flange.The term "sleeve" is to be understood as a body which is preferably rotationally symmetrical with respect to its longitudinal axis and which is formed hollow on the inside along the longitudinal axis of the body.The sleeve is open on both sides. Consequently, the sleeve can have an opening of the sleeve at one end of the sleeve and a further opening of the sleeve opposite the opening at a further end of the sleeve opposite the end, which can delimit the interior space of the sleeve together with the inner wall of the sleeve. A longitudinal axis of the sleeve may pierce the opening and the further opening. The interior space may form a passage of the sleeve. Preferably, a thickness of the sleeve, i.e. a distance between the inner wall of the sleeve and an outer wall of the sleeve, is comparatively small. Furthermore, a diameter of the sleeve, i.e. an extension perpendicular to the longitudinal direction of the sleeve, can be comparatively large compared to a height of the sleeve, i.e. an extension in the longitudinal direction of the sleeve.The container can comprise a cylindrical section at the end opposite to the direction of the longitudinal axis and a frustoconical section arranged adjacent to the cylindrical section in the longitudinal direction. The sleeve may be arranged in the container overlapping the cylindrical portion and the frustoconical portion. It is likewise possible to arrange the sleeve at a height of the cylindrical section or of the frustoconical section. The discharge device can be arranged in the direction of the longitudinal axis adjacent to or below the frustoconical section. Nevertheless, it is also possible for the container to be designed at the end in a conical or frustoconical manner counter to the direction of the longitudinal axis. A cone shape or truncated cone shape can then extend as far as an upper edge of the container.The container can advantageously be configured rotationally symmetrically with respect to the longitudinal axis and have a circular cross section.The sleeve can be conical or conical.Advantageously, the sleeve can be formed tapering in the direction of the longitudinal axis, in the form of a hollow truncated cone. Consequently, a shape of the sleeve may be adapted to the funnel shape of the container such that the outer wall of the sleeve may extend at least partially parallel to the inner wall of the container such that the mixture between the outer wall of the sleeve and the inner wall of the container may be optimally guided. An opening angle of the sleeve can then be selected to correspond to an opening angle of the container. In principle, however, the sleeve can also have a different shape. For example, the sleeve can also be hollow cylindrical. The shape of the sleeve may be adapted to a shape of the container and to an arrangement of the sleeve in the container. In particular, a cross-sectional shape of the sleeve can be adapted to a cross-sectional shape of the container.Advantageously, the sleeve and the container can be arranged coaxially with respect to the longitudinal axis. However, the sleeve may be disposed in the container such that the longitudinal axis of the sleeve is spaced from the longitudinal axis of the container in the radial direction, parallel to the longitudinal axis of the container. Likewise, the longitudinal axis of the sleeve can be inclined by an angle with respect to the longitudinal axis of the container. Advantageously, the longitudinal axis of the sleeve is aligned with the longitudinal axis of the container.Advantageously, the inlet can be arranged at a height from the sleeve. The mixture introduced into the container can thus pass directly into the stilling region formed between the outer wall of the sleeve and the inner wall of the container. At the same time, the tangential introduction of the mixture into the container can ensure that the mixture does not flow frontally against the outer wall of the sleeve, whereby additional turbulences can be avoided.Advantageously, the inlet can be arranged adjacent to the outlet in the direction of the longitudinal axis. In other words, the outlet can be arranged above the inlet.Furthermore, the outlet can be arranged located on the outside in the radial direction. Because the outlet is then not centrally arranged in the upper region, as in the treatment device known from the prior art, turbulences can additionally be avoided.Furthermore, the outlet can be arranged offset from the inlet by an angle of preferably 90° in an azimuthal direction with respect to the longitudinal axis. In principle, the angle can be suitably selected.According to the invention, the sleeve bears with an end of the sleeve opposite the direction of the longitudinal axis on the outside of the inner wall of the container in a liquid-tight manner in the radial direction. In other words, no gap is then formed between the inner wall of the container and the end of the sleeve. This makes it possible to prevent the liquid containing the organic solids, which flows from the central region into the upper region and after it has completely passed through the interior of the sleeve, from reaching the end of the sleeve back into the inflow region or into the settling region in a overflowing manner. Therefore, the sleeve can bear with the end opposite the direction of the longitudinal axis on the outside in the radial direction firmly and liquid-tight against the inner wall of the container. The outlet can then be arranged counter to the longitudinal direction adjacent to the sleeve, i.e. above the sleeve. Likewise, the at least partial, liquid-tight contact of the sleeve on the container can prevent the untreated mixture from entering an area above the sleeve, where the outlet can be arranged. If the sleeve is formed conically or hollow-frusto-conical and the cylindrical section of the container and the frusto-conical section of the container are arranged overlapping in the container, the end of the sleeve opposite the direction of the longitudinal axis can, as it were, automatically strike the inner wall of the container on the outside in the radial direction and bear against it, preferably liquid-tight. An opening angle of the sleeve or of the cone or of the hollow truncated cone can then be selected to match an opening angle of the truncated cone-shaped section of the container. In principle, however, a gap formed between the inner wall of the container and the end of the sleeve, depending on the shape and arrangement of the sleeve, can also be closed by suitable means, for example by an annular element. It is likewise possible to achieve a closure of the gap by selecting the opening angle of the sleeve to be greater than the opening angle of the container.Advantageously, the treatment device can comprise a drain channel which is arranged at least partially in the sleeve and is connected to the drain and can form an overfall weir. The liquid containing the organic solids can then pass via the overflow weir into the outlet channel and from there to the outlet.The outlet channel can project beyond the sleeve counter to the direction of the longitudinal axis.In an advantageous embodiment of the invention, the outlet channel can essentially form a circular ring.Advantageously, a diameter of the outlet channel can be smaller than a diameter of the sleeve, wherein the outlet channel can form the overflow weir on both sides. In this case, an edge running along an outer circle of the circular ring can form a first overflow weir and an edge running along an inner circle of the circular ring can form a second overflow weir. As a result, a length of the overflow weir can be increased considerably, which can result in a comparatively small overflow height or weir edge load, which can keep the flow velocity of the liquid containing the organic solids in front of a weir edge small and can not cause any large changes in a mixture level or liquid level formed in the container even in the case of varying inflow amounts in the container. This embodiment is particularly advantageous and makes it possible, in particular, to achieve a separation performance of 95% for a grain size of approximately 100 μm and greater with an essentially unchanged feed quantity. In principle, a treatment device known from the prior art, which has been equipped with the guiding device and outlet channel according to the invention, can then be used. Further complicated structural changes are then not required.Advantageously, the outlet channel and the container can be arranged coaxially with respect to the longitudinal axis. In principle, however, a longitudinal axis of the outlet channel can also be spaced apart from the longitudinal axis of the container and run parallel thereto. Advantageously, the container, the outlet channel and the sleeve can be arranged coaxially with respect to the longitudinal axis.Furthermore, the outlet channel can have, in a region of the outlet channel which is connected to the outlet, a preferably arcuate guide element which can be configured to guide the liquid containing the organic solids from the outlet channel to the outlet. If the discharge channel essentially forms a circular ring, the discharge channel can have two arcuate guide elements, which can ensure that the liquid containing the organic solids, which flows from a first half of the circular ring in a direction of the discharge, can flow not beyond the region of the discharge channel which is connected to the discharge, for example, into a second half of the discharge channel, but can be guided directly to the discharge. Thus, a draining amount can be advantageously increased.Advantageously, the treatment device can comprise a stirring device with a stirring element carrier, preferably aligned with the longitudinal axis, and at least one stirring element arranged on the stirring element carrier in the lower region. Furthermore, the stirring device can comprise a drive means. By means of the stirring device and an additional addition of a liquid, in particular water, the inorganic mineral solids can be separated from the remaining organic solids in an upflow process. Advantageously, the stirring elements can be paddle-shaped.The treatment device can advantageously be designed as a sand classifier or sand washer.Further advantageous embodiments of the treatment device are evident from the feature descriptions of the dependent claims referring back to method claim 15.In the method according to the invention for the treatment of a mixture formed at least from a liquid, organic solids and inorganic mineral solids, in particular for the separation of inorganic mineral solids contaminated with organic solids from a liquid, by means of a treatment device, the mixture is accommodated in a container of the treatment device which is formed so as to taper like a funnel in a direction of a longitudinal axis of the container, wherein the mixture is introduced tangentially into the container by means of an inlet of the treatment device provided in an upper region of the container and located on the outside in a direction radial with respect to the longitudinal axis, and the liquid substantially containing the organic solids is discharged from the container by means of an outlet of the treatment device provided in the upper region, wherein in a central region of the container which is arranged adjacent to the upper region in the direction of the longitudinal axis, adjacent to a central region of the container which is arranged adjacent to the upper region in the direction of the longitudinal axis, In a further embodiment, the invention provides a method for the production of a lower region of the container which is arranged in the upper region and is open on both sides, wherein the inorganic mineral solids which form the base are discharged by means of a discharge device of the treatment apparatus which is connected to the lower region, wherein the mixture introduced into the container through the inflow is guided between an outer wall of the sleeve and an inner wall of the container from the upper region to the middle region by means of a sleeve which is arranged in the upper region and extends in the direction of the longitudinal axis and forms a guide device, and the liquid which contains the organic solids is guided, traversing an inner space of the sleeve which is bounded by an inner wall of the sleeve, for discharge from the outflow from the middle region to the upper region, wherein the sleeve bears with an end of the sleeve opposite the direction of the longitudinal axis on the outside of the inner wall of the container in a liquid-tight manner in the radial direction. Regarding the advantageous effects of the method according to the invention, reference is made to the description of the advantages of the treatment device according to the invention.Advantageously, a flow of the mixture can be equalized between the outer wall of the sleeve and the inner wall of the container and a flow velocity of the mixture can be reduced.Furthermore, the liquid containing the organic solids can flow in the middle region in the radial direction inwards counter to the longitudinal axis to the upper region. Consequently, the central region can comprise a radially outer region and a radially inner region, wherein the mixture in the radially outer region can flow coming from the upper region in the longitudinal direction downwards and the liquid containing the organic solids can flow in the radially inner region counter to the direction of the longitudinal axis reaching the upper region.Advantageously, the liquid containing the organic solids can flow into a discharge channel of the treatment device, which is arranged partially in the sleeve and is connected to the outlet and projects beyond the sleeve counter to the direction of the longitudinal axis and forms essentially a circular ring with a smaller diameter than a diameter of the sleeve and forms a double-sided fall weir.Advantageously, the mixture can be introduced into the container below a mixture level or liquid level formed in the container.Further advantageous embodiments of the method are evident from the feature descriptions of the dependent claims referring back to the device claim 1.Preferred embodiments of the invention are explained in more detail below with reference to the attached drawings.The following are shown: FIG. 1 is a side view of a treatment device; FIG. 2 is a further side view of the treatment device; FIG. 3 is a front view of the treatment device; FIG. 4 is a rear view of the treatment device; FIG. 5 is a plan view of the treatment device; FIG. 6 shows a lateral sectional view of the treatment device; FIG. 7 is an upper sectional view of the treatment device; FIG. 8 shows a lateral sectional view of the treatment device, which shows a flow profile.A combination of FIGS. 1 to 8 shows a treatment device 10 which comprises a container 11 for receiving a mixture formed at least from a liquid, organic solids and inorganic mineral solids, not shown here, wherein the container 11 is formed so as to taper in a funnel shape in a direction 18 shown in FIG. 6 of a longitudinal axis 12 of the container 11 also shown in FIG. 6. The treatment apparatus 11 further comprises a frame 41 on which the container 11 is arranged, and a discharge device 33 for discharging a sediment 19 formed by the inorganic mineral solids, which sediment is shown in FIG. 8. The discharge device 33 comprises a discharge screw 34, which is driven by a drive means 35 of the discharge device 33. Furthermore, the discharge device 33 comprises at the end a discharge channel 36, by means of which the inorganic mineral solids cleaned from and discharged from the organic solids can be discharged into a collecting container, not shown here, which can be arranged below the discharge channel 36.As shown in FIG. 6, the container 11 has an upper region 13, a middle region 14 and a lower region 15. In the upper region 13, an inlet 16 of the treatment device 10 situated on the outside in a direction 42 radial with respect to the longitudinal axis 12 and shown in FIG. 7 is provided for tangentially introducing the mixture into the container 11 and an outlet 17 of the treatment device 10 is provided for discharging the liquid substantially containing the organic solids from the container 11. The inlet 16 has an inlet flange 37, while the outlet 17 has an outlet flange 38. Furthermore, the outlet 17 is arranged offset by 90° with respect to the inlet 16 in an azimuthal direction 40 with respect to the longitudinal axis 12, which is shown in FIG. 7.The treatment apparatus 10 further comprises a stirring device 29 with a stirring element carrier 30 shown in FIG. 6 aligned with the longitudinal axis 12 and, in the lower region 15 in which the sediment 19 is formed, stirring elements 31 arranged on the stirring element carrier 30, which stirring elements are shown in FIGS. 6 and 7. The stirring device 29 further comprises a drive means 32, by means of which the stirring element carrier 30 can be set in rotation.As can be seen from FIGS. 6 to 8, the treatment apparatus 10 comprises, in the upper region 13, a sleeve 20 which extends in the direction 18 of the longitudinal axis 12 and forms a guide device. The sleeve 20 is open on both sides and is designed to taper in the direction 18 of the longitudinal axis 12 and to be hollow truncated cone-shaped. The sleeve 20 is configured to guide the mixture introduced into the container 11 through the inlet 16 between an outer wall 21 of the sleeve 20 and an inner wall 22 of the container 11 from the upper region 13 to the middle region 14 and to guide the liquid containing the organic solids, traversing an inner space 24 of the sleeve 20 bounded by an inner wall 23 of the sleeve 20, for expansion out of the outlet 17 from the middle region 14 to the upper region 13. In this case, the liquid containing the organic solids flows in the middle region 14 in the radial direction 42 inwards, counter to the direction 18 of the longitudinal axis 12, to the upper region 13, After the liquid containing the organic solids has passed through the sleeve 20, it flows into a circular-shaped outlet channel 26 of the treatment device 10 which is arranged partially in the sleeve 20 and is connected to the outlet 17 and protrudes beyond the sleeve 20 counter to the direction 18 of the longitudinal axis 12 and forms a double-sided overflow weir 27. The outlet channel 26 has, in a region 43 of the outlet channel 26 which is connected to the outlet 17, two guide elements 28 of arcuate configuration which are configured to guide the liquid containing the organic solids from the outlet channel 26 to the outlet 17.The container 11, the sleeve 20 and the outlet channel 26 are arranged coaxially with respect to the longitudinal axis 12.Furthermore, a diameter of the discharge channel 26, not shown here, is smaller than a diameter of the sleeve 20, not shown here.The sleeve 20 bears with an end 25 of the sleeve 20 opposite the direction 18 of the longitudinal axis 12 against the inside wall 22 of the container 11 in a liquid-tight manner on the outside in the radial direction 42. The inlet 16 is disposed at a height from the sleeve 20. Furthermore, the inlet 16 is arranged adjacent to the longitudinal axis 12 in the direction 18, i.e. below the outlet 17.Due to the advantageous combination of the sleeve 20 forming the guide device with the circular ring-shaped outlet channel 26 forming the overflow weir 27 on both sides, it is possible to achieve a separation capacity of 95% for a grain size of approximately 100 μm and greater with the treatment device 10 with a substantially unchanged feed quantity.

Claims

Treatment device (10) for treating a mixture formed at least from a liquid, organic solids and inorganic mineral solids, in particular for separating inorganic mineral solids contaminated with organic solids from a liquid, comprising a container (11) for receiving the mixture, which container is formed so as to taper in a funnel shape in a direction (18) of a longitudinal axis (12) of the container, wherein the container comprises an upper region (13) in which an inlet (16) of the treatment device, which inlet is located on the outside in a direction (42) radial with respect to the longitudinal axis, is provided for tangentially introducing the mixture into the container and an outlet (17) of the treatment device for discharging the liquid containing the organic solids from the container, a central region (14) arranged adjacent to the upper region in the direction of the longitudinal axis and having a lower region (15) arranged adjacent to the central region in the direction of the longitudinal axis for forming a sediment (19) from the inorganic mineral solids, and a discharge device (33) connected to the lower region for discharging the inorganic mineral solids forming the sediment, wherein the treatment device comprises a sleeve (20) arranged in the upper region and extending in the direction of the longitudinal axis and forming a guide device and open on both sides, which sleeve is configured to guide the mixture introduced into the container through the inlet between an outer wall (21) of the sleeve and an inner wall (22) of the container from the upper region to the central region, characterized in that the sleeve is further configured to guide the mixture introduced into the container through the inlet from the upper region to the central region, the liquid containing the organic solids to be guided traversing an interior space (24) of the sleeve delimited by an inner wall (23) of the sleeve for discharge from the outlet from the central region to the upper region, wherein the sleeve bears against the inner wall of the container on the outside in the radial direction in a liquid-tight manner with an end (25) of the sleeve situated opposite the direction of the longitudinal axis.Treatment device according to claim 1, characterised in that the sleeve (20) is formed tapering in the direction (18) of the longitudinal axis (12), in the form of a hollow truncated cone.Treatment device according to claim 1 or 2, characterised in that the sleeve (20) and the container (11) are arranged coaxially with respect to the longitudinal axis (12).Treatment device according to one of Claims 1 to 3, characterized in that the inlet (16) is arranged at a height from the sleeve (20).Treatment device according to one of the preceding claims, characterized in that the inlet (16) is arranged adjacent to the outlet (17) in the direction (18) of the longitudinal axis (12).Treatment device according to one of the preceding claims, characterized in that the outlet (17) is arranged on the outside in the radial direction (42).Treatment device according to one of the preceding claims, characterized in that the treatment device (10) comprises a drain channel (26) which is arranged at least partially in the sleeve (20) and is connected to the drain (17) and forms an overflow weir (27).Treatment device according to claim 7, characterised in that the outlet channel (26) projects beyond the sleeve (20) counter to the direction (18) of the longitudinal axis (12).Treatment device according to claim 7 or 8, characterised in that the outlet channel (26) forms a circular ring.Treatment device according to claim 9, characterised in that a diameter of the outlet channel (26) is smaller than a diameter of the sleeve (20), wherein the outlet channel forms the overflow weir (27) on both sides.Treatment device according to one of claims 7 to 10, characterised in that the outlet channel (26) and the container (11) are arranged coaxially to one another with respect to the longitudinal axis (12).Treatment device according to one of claims 9 to 11, characterised in that the outlet channel (26) has, in a region (43) of the outlet channel which is connected to the outlet (17), a, preferably arcuate, guide element (28) which is configured to guide the liquid containing the organic solids from the outlet channel to the outlet.Treatment device according to one of the preceding claims, characterized in that the treatment device (10) comprises a stirring device (29) having a stirring element carrier (30), preferably aligned with the longitudinal axis (12), and at least one stirring element (31) arranged on the stirring element carrier in the lower region (15).Treatment device according to one of the preceding claims, characterized in that the treatment device (10) is designed as a sand classifier or sand washer.Method for treating a mixture formed at least from a liquid, organic solids and inorganic mineral solids, in particular for separating inorganic mineral solids contaminated with organic solids from a liquid, by means of a treatment device (10), wherein the mixture is accommodated in a container (11) of the treatment device which is formed so as to taper in a funnel shape in a direction (18) of a longitudinal axis (12) of the container, wherein the mixture is introduced tangentially into the container by means of an inlet (16) of the treatment device provided in an upper region (13) of the container and located on the outside in a direction (42) radial with respect to the longitudinal axis, and the liquid containing the organic solids is discharged from the container by means of an outlet (17) of the treatment device provided in the upper region, wherein in an outlet (17) of the treatment device adjacent to a central region (14) of the container in the direction of the longitudinal axis, which is arranged in the direction of the longitudinal axis adjacent to the upper region, a sediment (19) is formed from the inorganic mineral solids in the lower region (15) of the container, wherein the inorganic mineral solids forming the sediment are discharged by means of a discharge device (33) of the treatment device connected to the lower region, wherein by means of a sleeve (20) which is arranged in the upper region and extends in the direction of the longitudinal axis and forms a guide device and is open on both sides, the mixture introduced into the container through the inlet is guided from the upper region to the middle region between an outer wall (21) of the sleeve and an inner wall (22) of the container, characterized in that, by means of the sleeve, the liquid containing the organic solids is furthermore guided traversing an interior space (24) of the sleeve delimited by an inner wall (23) of the sleeve for discharge from the outlet from the central region to the upper region, wherein the sleeve bears with an end (25) of the sleeve opposite the direction of the longitudinal axis on the outside of the inner wall of the container in a liquid-tight manner in the radial direction.Method according to claim 15, characterised in that a flow of the mixture is equalised between the outer wall (21) of the sleeve and the inner wall (22) of the container and a flow speed of the mixture is reduced.Method according to Claim 15 or 16, characterized in that the liquid containing the organic solids flows in the central region (14) in the radial direction (42) on the inside, counter to the direction (18) of the longitudinal axis (12), reaching the upper region (13).Method according to one of Claims 15 to 17, characterized in that the liquid containing the organic solids flows into a discharge channel (26) of the treatment device (10), which is arranged partially in the sleeve (20) and is connected to the outlet (17) and projects beyond the sleeve counter to the direction (18) of the longitudinal axis (12) and forms a circular ring having a smaller diameter than a diameter of the sleeve and forms a double-sided overflow weir (27).Method according to one of Claims 15 to 18, characterized in that the mixture is introduced into the container below a mixture level or liquid level formed in the container (11).

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