Sludge screening device

Abstract

The invention discloses a sludge screener, which belongs to the technical field of wastewater treatment, is used for separating activated sludge from sludge mixed liquor, and comprises a primary separation pipe and a secondary separation pipe, a primary feed port is used for pumping the sludge mixed liquor into the primary separation pipe, and a secondary feed port is used for pumping the sludge mixed liquor into the secondary separation pipe; the sludge mixed liquid is primarily separated in the process of flowing towards the first-stage discharge port along the pipe wall of the first-stage separation pipe in a spiral flowing manner; the sludge screener further comprises a second-stage separation part, and the second-stage separation part can convey separation liquid to the second-stage separation pipe and form separation vortexes on the periphery of the sludge mixed liquid. The separation vortex pumps low middle air pressure in the spiral flowing process, pressure difference is provided for the sludge mixed liquid and the outer space of the sludge mixed liquid, the centrifugal force of the sludge mixed liquid is enhanced through the pressure difference, and part of high-quality activated sludge in the sludge mixed liquid is driven by the higher centrifugal force to move towards the outer separation vortex, so that the sludge separation effect is improved. The further separation of the activated sludge in the sludge mixed liquid is realized.

Description

Technical Field

[0001] The present application belongs to the technical field of wastewater treatment, and in particular relates to a sludge screener. Background Art

[0002] The activated sludge method is a wastewater treatment technology based on activated sludge. It is a bioengineering technology that uses a series of artificially enhanced and controlled technical measures to fully exert the physiological functions of microorganisms in the activated sludge to oxidize and decompose organic pollutants, thereby achieving wastewater purification.

[0003] Activated sludge usually contains light sludge or particles such as filaments. The poor sludge settling characteristics cause biomass loss, resulting in sludge expansion and high sludge production, which affects the water purification effect. Therefore, screening high-quality sludge is of great significance to the normal operation of the activated sludge wastewater treatment system.

[0004] Traditional sludge screeners usually use gravity sedimentation to separate the high-density particles or silky sludge inside the activated sludge to purify the activated sludge. However, this screening method can usually only separate some high-quality coarse activated sludge particles, and cannot effectively screen some low-quality fine activated sludge particles, and the screening efficiency of high-quality activated sludge cannot be effectively guaranteed. Summary of the invention

[0005] The present application provides a sludge screener to solve the technical problem that the traditional sludge screener has a poor separation effect on the activated sludge in the sludge mixture.

[0006] The technical solution adopted in this application is:

[0007] A sludge screener is used to separate activated sludge from a sludge mixture, comprising a primary separation tube and a secondary separation tube, wherein the primary separation tube comprises a primary feed port and a primary discharge port, wherein the secondary separation tube has a secondary feed port connected to the primary separation tube, wherein the primary feed port is used to pump the sludge mixture into the primary separation tube, and achieve preliminary separation in the process of the sludge mixture flowing in a spiral flow along the tube wall of the primary separation tube toward the primary discharge port; a turning zone is provided in the primary separation tube on the flow path of the sludge mixture toward the primary discharge port, so that the sludge mixture changes its movement direction through the turning zone in the process of flowing toward the primary discharge port and enters the secondary separation tube in a spiral flow from the secondary feed port; the sludge screener also comprises a secondary separation element, which can transport separation liquid to the secondary separation tube and form a separation vortex on the periphery of the sludge mixture for increasing the centrifugal force of the sludge mixture.

[0008] The sludge screen described in this application also includes the following additional technical features:

[0009] The secondary separation component includes a pump liquid component and a closed shell. The closed shell cooperates with the secondary separation tube to form a liquid supply cavity. The tube wall of the secondary separation tube is provided with a plurality of infusion ports connected to the liquid supply cavity. The pump liquid component can transport separation liquid to the liquid supply cavity.

[0010] The angle α between the plane where the opening direction of the infusion port is located and the plane where the tangent line of the cross-section circle of the secondary separation tube is located satisfies 0°<α≤30°, and / or the angle β between the plane where the opening direction of the infusion port is located and the tube wall of the secondary separation tube satisfies 70°≤β≤85°.

[0011] The secondary separation element also includes an infusion tube connected to the infusion port, the extension direction of the infusion tube is consistent with the opening direction of the infusion port, and the separation liquid in the liquid supply cavity is transported to the secondary separation tube through the infusion tube.

[0012] A plurality of infusion groups are arranged at intervals along the extension direction of the secondary separation tube, and the infusion groups include a plurality of infusion ports whose projections toward the axial direction of the secondary separation tube overlap.

[0013] The first-stage separation tube and the second-stage separation tube both extend in a vertical direction, and an extension line of an axis of the first-stage separation tube coincides with an extension line of an axis of the second-stage separation tube.

[0014] The first-level feed pipe includes a cylindrical section and a conical section. The first-level feed port is arranged in the cylindrical section. One end of the conical section is connected to the cylindrical section, and the other end extends in a direction away from the cylindrical section with a gradually decreasing cross-sectional area. At least a partial area within the conical section constitutes the return zone.

[0015] It also includes a reflection plate arranged in the return zone, a flow gap is arranged between the reflection plate and the tube wall of the first-stage separation tube, and the reflection plate has a reflection surface facing the second-stage feed port.

[0016] The ratio of the width of the flow gap to the width of the reflecting surface is 11%-25%.

[0017] It also includes a pumping component, which includes a variable frequency pump and a feed pipe. The variable frequency pump delivers the sludge mixture to the primary feed inlet through the feed pipe. The variable frequency pump can adjust the pumping power to adjust the speed at which the sludge mixture enters the primary separation pipe.

[0018] Due to the adoption of the above technical solution, the beneficial effects achieved by this application are as follows:

[0019] 1. The sludge screener of the present application includes a primary separation tube. When the sludge mixture is screened and purified, the sludge mixture is first transported to the primary separation tube through the primary feed port. Under the combined action of centrifugal force and its own gravity, the sludge mixture will spirally flow along the tube wall of the primary separation tube toward the primary discharge port. Due to the different densities of the internal components of the sludge mixture, during the spiral flow of the sludge mixture, the activated sludge with higher density and better sedimentation performance will be subjected to a greater centrifugal force and separated to the outside of the sludge mixture. As the sludge mixture flows in spirals, the air pressure at the central axis of the spiral flow will be reduced to form a low-pressure area or even a negative pressure area, while the filamentous sludge with relatively low density, poor activity and sedimentation characteristics will be subjected to less centrifugal force, and therefore will be continuously moved toward the middle under the action of the pressure difference in the spiral flow, thereby realizing the primary separation of the activated sludge in the sludge mixture. When the sludge mixture moves to the return zone, the low-density sludge mixture mainly composed of filamentous sludge in the middle will be affected by the return force of the return zone and change its movement direction, moving toward the secondary feed port and entering the secondary separation tube from the secondary feed port. The separated high-quality activated sludge is discharged through the primary discharge port. The sludge mixture entering the secondary separation tube from the secondary feed port will flow in a spiral under the action of centrifugal force, and the separation liquid transported by the secondary separation element will form a spiral flow separation vortex on the outside of the sludge mixture under the combined action of its own centrifugal force and gravity. The separation vortex lowers the middle air pressure during the spiral flow, so that the air pressure outside the sludge mixture is reduced, and then a greater pressure difference is provided for the sludge mixture and its outer space. This part of the pressure difference enhances the centrifugal force of the sludge mixture, and some of the lower-density fine-particle activated sludge in the sludge mixture is driven by a stronger centrifugal force to move toward the outer separation vortex and be adsorbed by the separation vortex, thereby achieving the sludge mixture. Further separation of activated sludge in the liquid; in addition, the low-density fine-particle sludge in the sludge mixed liquor is returned to the primary separation tube through the secondary feed port under the drive of the separation vortex, and is discharged from the primary discharge port together with the separation vortex. In this process, the separation vortex can also flush the activated sludge separated by the preliminary separation in the primary separation tube, and discharge it through the primary discharge port together with the activated sludge separated by the preliminary separation, thereby reducing the possibility of the activated sludge separated by the preliminary separation being adsorbed on the wall of the primary separation tube, thereby reducing the possibility of the activated sludge blocking the primary discharge port, and providing stability guarantee for the smooth separation of the activated sludge.

[0020] 2. As a preferred embodiment of the present application, the secondary separation component includes a pump liquid assembly and a closed shell, the closed shell cooperates with the secondary separation tube to form a liquid supply cavity, the tube wall of the secondary separation tube is provided with a plurality of infusion ports connected to the liquid supply cavity, and the pump liquid assembly can transport the separation liquid to the liquid supply cavity. The separation liquid is pumped into the liquid supply chamber by the pump liquid component, and the separation liquid in the liquid supply chamber is then transported into the secondary separation tube through multiple infusion ports, and the liquid flows of the separation liquid output from the multiple infusion ports together form a separation vortex, which improves the uniformity of the formation of the separation vortex and helps to maintain the flow dynamics of the separation vortex; in addition, the design of the liquid supply chamber allows the pump liquid component to fill the pump liquid component first when pumping the separation liquid into the secondary separation tube, and the pumping component continues to inject the separation liquid into the liquid supply chamber, and the separation liquid in the liquid supply chamber is uniformly injected into the secondary separation tube through each infusion port, so that the separation liquid input into the secondary separation tube from each infusion port has the same transport kinetic energy, that is, has the same initial velocity, thereby forming a stable separation vortex together, avoiding the occurrence of separation vortex instability caused by the difference in kinetic energy of the separation liquid transported by the infusion port; furthermore, by providing a closed casing and a liquid supply chamber, only one set of pump liquid components is required to realize the separation liquid delivery to multiple infusion ports, without the need to provide multiple sets of pump liquid components to separately transport the separation liquid to the infusion ports, thereby optimizing the structural design of the secondary separation component.

[0021] 3. As a preferred embodiment of the present application, the angle α between the extension line of the opening direction of the infusion tube and the tangent line of the cross-section circle of the secondary separation tube is set to satisfy 0°<α≤30°, so that the opening direction of the infusion tube is kept close to the tube wall of the secondary separation tube to a certain extent. In this way, when the separation liquid enters the secondary separation tube from the infusion tube, the separation liquid can quickly approach the tube wall of the secondary separation tube and flow in a spiral along the tube wall under the guidance of the tube wall, thereby reducing the probability that the separation liquid and the tube wall of the secondary separation tube collide violently and fail to quickly form a separation vortex. At the same time The kinetic energy loss after the separation liquid collides with the wall of the secondary separation tube is reduced, which helps to improve the spiral flow rate of the separation vortex and enhance the adsorption efficiency of the activated sludge in the sludge mixture; and the angle β between the extension line of the opening direction of the infusion tube and the wall of the secondary separation tube satisfies 70°≤β≤85°, which provides the separation liquid entering the secondary separation tube with an initial velocity along the length direction of the secondary separation tube, so that the separation liquid can move faster along the wall of the secondary separation tube toward the secondary feed port in the form of a spiral flow, thereby realizing the rapid transportation of the adsorbed activated sludge.

[0022] 4. As a preferred embodiment of the present application, by setting an infusion tube, when the separation liquid in the liquid supply cavity enters the secondary separation tube through the infusion port, it will first enter the infusion tube. Before moving to the infusion port, the separation liquid in the infusion tube has adjusted its flow direction after experiencing a collision with the inner wall of the infusion tube during the flow process, so that the separation liquid enters the secondary separation tube along the opening direction of the infusion port together; that is, by setting the infusion tube, a guiding effect is provided for the separation liquid entering the secondary separation tube, reducing the probability of collision and collapse of the separation liquid caused by different flow directions at the initial stage of entering the secondary separation tube, thereby effectively ensuring the kinetic energy strength of the separation liquid after entering the secondary separation tube, and providing a guarantee for the stability of the formation of the separation vortex. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The drawings described herein are used to provide a further understanding of the present application and constitute a part of the present application. The illustrative embodiments of the present application and their descriptions are used to explain the present application and do not constitute an improper limitation on the present application. In the drawings:

[0024] Figure 1 A cross-sectional view of a sludge screen in one embodiment of the present application Figure 1 ;

[0025] Figure 2 A cross-sectional view of a sludge screen in one embodiment of the present application Figure 2 ;

[0026] Figure 3 for Figure 2 A magnified view of part A;

[0027] Figure 4 A cross-sectional view of a sludge screen structure according to an embodiment of the present invention Figure 1 ;

[0028] Figure 5 A cross-sectional view of a sludge screen structure according to an embodiment of the present invention Figure 2 ;

[0029] Figure 6 This is a schematic diagram of the structure of a sludge screen part in one implementation mode of the present application.

[0030] in:

[0031] 1. Primary separation tube; 11. Primary feed port; 12. Primary discharge port; 13. Cylindrical section; 14. Conical section;

[0032] 2. Secondary separation tube; 21. Secondary feed port; 22. Secondary discharge port; 23. Infusion port;

[0033] 3. Secondary separation component; 31. Enclosed casing; 311. Liquid inlet channel; 32. Pump liquid assembly; 321. Infusion pump; 322. Transmission tube; 33. Liquid supply cavity; 34. Infusion tube;

[0034] 4. Reflector; 41. Reflecting surface;

[0035] 5. Current clearance;

[0036] 6. Pumping assembly; 61. Variable frequency pump; 62. Feed pipe. DETAILED DESCRIPTION

[0037] In order to more clearly illustrate the overall concept of the present application, a detailed description is given below in an illustrative manner in conjunction with the accompanying drawings.

[0038] In the following description, many specific details are set forth to facilitate a full understanding of the present application. However, the present application may also be implemented in other ways different from those described herein. Therefore, the protection scope of the present application is not limited by the specific embodiments disclosed below. It should be noted that the embodiments of the present application and the features in each embodiment may be combined with each other without conflict.

[0039] In addition, in the description of the present application, it should be understood that the orientations or positional relationships indicated by the terms "top", "bottom", "inside", "outside", "axial", "radial", "circumferential", etc. are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0040] In this application, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, an electrical connection, or a communication; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0041] In the present application, unless otherwise clearly specified and limited, a first feature "above" or "below" a second feature may be that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in an appropriate manner in any one or more embodiments or examples.

[0042] like Figures 1 to 6 As shown, a sludge screener is used to separate activated sludge from a sludge mixture, comprising a primary separation tube 1 and a secondary separation tube 2, wherein the primary separation tube 1 comprises a primary feed port 11 and a primary discharge port 12, and the secondary separation tube 2 comprises a secondary feed port 21 connected to the primary separation tube 1, wherein the primary feed port 11 is used to pump the sludge mixture into the primary separation tube 1, and make the sludge mixture flow in a spiral flow along the tube wall of the primary separation tube 1 toward the primary discharge port 12 to achieve preliminary separation; a return zone is provided in the primary separation tube 1 on the flow path of the sludge mixture toward the primary discharge port 12, so that the sludge mixture changes its movement direction through the return zone during its flow toward the primary discharge port 12 and enters the secondary separation tube 2 in a spiral flow from the secondary feed port 21; the sludge screener also comprises a secondary separation element 3, which can transport separation liquid to the secondary separation tube 2 and form a separation vortex on the periphery of the sludge mixture for increasing the centrifugal force of the sludge mixture.

[0043] The sludge screener of the present application includes a primary separation tube 1. When the sludge mixture is screened and purified, the sludge mixture is first transported to the primary separation tube 1 through the primary feed port 11. Under the combined effect of centrifugal force and its own gravity, the sludge mixture will spirally flow along the wall of the primary separation tube 1 toward the primary discharge port. Due to the different densities of the components inside the sludge mixture, during the spiral flow of the sludge mixture, the activated sludge with higher density and better sedimentation performance will be subjected to a greater centrifugal force and separated to the outside of the sludge mixture. As the sludge mixture spirals, the air pressure at the central axis of the spiral flow will be reduced to form a low-pressure zone or even a negative pressure zone. The filamentous sludge with relatively low density, poor activity and sedimentation characteristics is subjected to less centrifugal force, and therefore will be continuously moved toward the middle under the effect of the pressure difference during the spiral flow, thereby realizing the primary separation of the activated sludge in the sludge mixture. When the sludge mixture moves to the return zone, the low-density sludge mixture mainly composed of filamentous sludge in the middle will be affected by the return force of the return zone and change its movement direction, moving toward the secondary feed port 21 and entering the secondary separation tube 2 from the secondary feed port 21. The separated high-quality activated sludge is discharged through the primary discharge port 11. The sludge mixture entering the secondary separation tube 2 from the secondary feed port 21 will flow in a spiral under the action of centrifugal force, and the separation liquid transported by the secondary separation element 3 forms a spiral flow separation vortex on the outside of the sludge mixture under the combined action of its own centrifugal force and gravity. The separation vortex draws down the middle air pressure during the spiral flow, so that the air pressure outside the sludge mixture is reduced, and then provides a greater pressure difference between the sludge mixture and its outer space. This part of the pressure difference enhances the centrifugal force of the sludge mixture, and some of the lower-density fine-particle activated sludge in the sludge mixture is driven by a stronger centrifugal force to move toward the outer separation vortex and is adsorbed by the separation vortex, thereby achieving the active sludge in the sludge mixture. Further separation of sludge; in addition, the low-density fine-particle sludge in the sludge mixture is driven by the separation vortex and returns to the primary separation tube 1 through the secondary feed port 21, and is discharged from the primary discharge port 11 together with the separation vortex. In this process, the separation vortex can also flush the activated sludge separated by the preliminary separation in the primary separation tube 1, and discharge it through the primary discharge port 11 together with the activated sludge separated by the preliminary separation, thereby reducing the possibility of the activated sludge separated by the preliminary separation being adsorbed on the tube wall of the primary separation tube 1, thereby reducing the possibility of the activated sludge blocking the primary discharge port 12, and providing stability guarantee for the smooth separation of the activated sludge.

[0044] Specifically, the workflow of the sludge filter of this application is as follows: Figure 2The motion trajectory of the sludge mixture and the separation vortex is schematically drawn. When the sludge mixture enters the primary separation tube 1 through the primary feed port 11, due to its certain initial velocity, it will spirally flow along the wall of the primary distribution tube 1 to the primary discharge port 12 according to the trajectory of the curve S1. The sludge mixture will be affected by the centrifugal force during the spiral flow, so that the high-quality activated sludge coarse particles with higher density are thrown to the outside of the sludge mixture. When the sludge mixture moves to the return zone, the sludge mixture with lower density in the middle part changes its direction of travel due to the return force and enters the secondary separation tube 2 through the secondary feed port 21 in the form of a suspended spiral flow along the trajectory shown by the curve S2. In this process, the sludge mixture and the walls of the primary separation tube 1 and the secondary separation tube 2 are No contact occurs, and the separated activated sludge is discharged from the primary separation tube 1 through the primary discharge port 12, thus achieving a primary separation of the sludge mixture; when the sludge mixture enters the secondary separation tube 2, it is still in a suspended state without contact with the tube wall of the secondary separation tube 2 and spirally rises along the curve S2. The separation vortex composed of the separation liquid on the outside of the sludge mixture generates a drag on the sludge mixture through its spiral flow along the tube wall of the secondary separation tube 2 along the trajectory of the curve S3, which adsorbs the activated sludge fine particles with lower density in the sludge mixture. This part of the activated sludge is adsorbed into the separation vortex under the action of the drag, and the separation vortex carries the activated sludge along the tube wall of the secondary separation tube 2 and spirals into the primary separation tube 1, and is discharged through the primary discharge port 12, thus achieving a secondary separation of the sludge.

[0045] Preferably, the diameter of the primary separation tube 1 is larger than the diameter of the secondary separation tube 2, and the density of the separation liquid is larger than the density of the sludge mixed liquid.

[0046] Preferably, the first-stage separation tube 1 is cylindrical at a position corresponding to the first-stage feed port 11 , and the opening direction of the first-stage feed port 11 is parallel to the tangent direction of the cross section of the first-stage separation tube 1 .

[0047] Preferably, the secondary separation tube 2 further includes a secondary discharge port 22 , and the sludge mixed liquid entering the secondary separation tube 2 from the secondary feed port 21 is discharged through the secondary discharge port 22 .

[0048] As a preferred embodiment of the present application, Figure 1 , Figure 4 As shown, the secondary separation component 3 includes a pump liquid component 32 and a closed shell 31. The closed shell 31 cooperates with the secondary separation tube 2 to form a liquid supply cavity 33. The tube wall of the secondary separation tube 2 is provided with a plurality of infusion ports 23 connected to the liquid supply cavity 33. The pump liquid component 32 can transport the separation liquid to the liquid supply cavity 33.

[0049] The separation liquid is pumped into the liquid supply chamber 33 by the pump liquid component 32, and the separation liquid in the liquid supply chamber 33 is then transported to the secondary separation tube 2 through multiple infusion ports 23. The liquid flows of the separation liquid output by the multiple infusion ports 23 together form a separation vortex, which improves the uniformity of the formation of the separation vortex and helps to maintain the flow dynamics of the separation vortex. In addition, the design of the liquid supply chamber 33 allows the pump liquid component 32 to be filled first when pumping the separation liquid into the secondary separation tube 2, and the pump liquid component 32 continues to inject the separation liquid into the liquid supply chamber 33. The separation liquid in the liquid supply chamber 33 is evenly distributed through each infusion port 23. is injected into the secondary separation tube 2, so that the separation liquid input into the secondary separation tube 2 from each infusion port 23 has the same conveying kinetic energy, that is, has the same initial velocity, thereby jointly forming a stable separation vortex, avoiding the occurrence of separation vortex instability caused by the difference in kinetic energy of the separation liquid conveyed by the infusion port 23; furthermore, by setting the closed shell 31 and the liquid supply cavity 33, only one set of pump liquid assembly 32 is required to realize the separation liquid conveyance to multiple infusion ports 23, and there is no need to set up multiple sets of pump liquid assemblies 32 to convey the separation liquid to the infusion ports 23 respectively, thereby optimizing the structural design of the secondary separation component 3.

[0050] Preferably, the pump liquid assembly 32 includes an infusion pump 321 and a transmission tube 322 connecting the infusion pump 321 with the liquid supply cavity 33, and the infusion pump 321 transports the separation liquid into the liquid supply cavity 33 through the transmission tube 322; the closed shell 31 is provided with a liquid inlet channel 311 connected with the transmission tube 322.

[0051] Specifically, the secondary separation tube 2 is cylindrical. The present embodiment does not limit the direction in which the infusion port 23 is opened, and any of the following embodiments may be adopted:

[0052] Embodiment 1: Figure 4 As shown, the angle α between the plane where the opening direction of the infusion port 23 is located and the plane where the tangent line of the cross-section circle of the secondary separation tube 2 is located satisfies 0°<α≤30°.

[0053] Embodiment 2: Figure 3 As shown, the angle β between the plane where the opening direction of the infusion port 23 is located and the tube wall of the secondary separation tube 2 satisfies 70°≤β≤85°.

[0054] Embodiment 3: Figures 2 to 4 As shown, the angle α between the plane where the opening direction of the infusion port 23 is located and the plane where the tangent line of the cross-section circle of the secondary separation tube 2 is located satisfies 0°<α≤30°, and the angle β between the plane where the opening direction of the infusion port 23 is located and the tube wall of the secondary separation tube 2 satisfies 70°≤β≤85°.

[0055] The angle α between the extension line of the opening direction of the infusion tube 34 and the tangent line of the cross-section circle of the secondary separation tube 2 is set to satisfy 0°<α≤30°, so that the opening direction of the infusion tube 34 is kept close to the tube wall of the secondary separation tube 2 to a certain extent. In this way, when the separation liquid enters the secondary separation tube 2 from the infusion tube 34, the separation liquid can quickly get close to the tube wall of the secondary separation tube 2 and flow in a spiral along the tube wall under the guidance of the tube wall, which reduces the probability that the separation liquid and the tube wall of the secondary separation tube 2 will collide violently and fail to quickly form a separation vortex, and at the same time reduces the separation liquid and the secondary separation tube 2. The kinetic energy loss after the collision with the tube wall of the secondary separation tube 2 helps to increase the spiral flow rate of the separation vortex and enhance the adsorption efficiency of the activated sludge in the sludge mixture; and the angle β between the extension line of the opening direction of the infusion tube 34 and the tube wall of the secondary separation tube 2 satisfies 70°≤β≤85°, which provides the separation liquid entering the secondary separation tube 2 with an initial velocity along the length direction of the secondary separation tube 2, so that the separation liquid can move faster along the tube wall of the secondary separation tube 2 toward the secondary feed port 21 in the form of a spiral flow, thereby realizing the rapid transportation of the adsorbed activated sludge.

[0056] As another preferred embodiment of this embodiment, Figures 1 to 4 As shown, the secondary separation element 3 also includes an infusion tube 34 connected to the infusion port 23, and the extension direction of the infusion tube 34 is consistent with the opening direction of the infusion port 23. The separation liquid in the liquid supply cavity 33 is transported to the secondary separation tube 2 through the infusion tube 34.

[0057] By setting up the infusion tube 34, when the separation liquid in the liquid supply cavity 33 enters the secondary separation tube 2 through the infusion port 23, it will first enter the infusion tube 34. Before moving to the infusion port 23, the separation liquid in the infusion tube 34 has adjusted its flow direction after experiencing a collision with the inner wall of the infusion tube 34 during the flow process, so that the separation liquid enters the secondary separation tube 2 along the opening direction of the infusion port 23; that is, by setting up the infusion tube 34, a guiding effect is provided for the separation liquid entering the secondary separation tube 2, and the probability of collision and collapse caused by different flow directions in the separation liquid at the initial stage of entering the secondary separation tube 2 is reduced, thereby effectively ensuring the kinetic energy intensity of the separation liquid after entering the secondary separation tube 2, and providing a guarantee for the stability of the formation of the separation vortex.

[0058] As another preferred embodiment of this implementation mode, Figure 1 , Figure 2As shown, a plurality of infusion groups are arranged at intervals along the extension direction of the secondary separation tube 2, and the infusion group includes a plurality of infusion ports 23 whose projections overlap in the axial direction of the secondary separation tube 2. In this arrangement, when the separation vortex moves along the inner wall of the secondary separation tube 2 toward the secondary feed port 21, there is an infusion group on its flow trajectory to supplement the separation liquid, because as the separation vortex continues to flow along the inner wall of the secondary separation tube 2, it will suffer kinetic energy loss due to the friction of the inner wall of the secondary separation tube 2 and other effects during the flow, which in turn affects its spiral flow efficiency. By setting up the infusion group, the separation liquid with sufficient kinetic energy can continuously supplement the separation vortex, effectively improving the kinetic energy uniformity of the separation vortex on the spiral flow path, and providing a guarantee for the separation function of the separation vortex.

[0059] As a preferred implementation of the present application, Figure 1 , Figure 2 As shown, the primary separation tube 1 and the secondary separation tube 2 are both extended in the vertical direction, and the axis extension line of the primary separation tube 1 coincides with the axis extension line of the secondary separation tube 2. After the sludge mixture undergoes a primary separation of the activated sludge in the primary material distribution pipe, it will spiral upward into the secondary separation tube 2 with the axis of the primary separation tube 1 as the rotation axis under the action of the return force in the return zone, thereby avoiding the possibility of deviation of the moving trajectory caused by gravity deviation during the movement of the sludge mixture from the primary separation tube 1 to the secondary separation tube 2. In addition, the activated sludge separated in the primary separation tube 1 can slide down along the tube wall of the primary separation tube 1 under the action of its own weight and be discharged from the primary discharge port 12, reducing the possibility of the activated sludge converging and clogging in the primary separation tube 1; furthermore, the separation vortex in the secondary separation tube 2 rotates from top to bottom into the primary separation tube 1 after adsorbing part of the activated sludge, and approaches the tube wall of the primary separation tube 1 under the action of centrifugal force, which plays an auxiliary flushing role for the activated sludge separated in the primary separation tube 1, further reducing the probability of the activated sludge separated in the primary separation tube 1 being blocked in the primary separation tube 1 during a separation process.

[0060] The present application does not limit the structural form of the primary separation tube 1 and the return zone, which can adopt any of the following embodiments:

[0061] Implementation method 1: Figure 6 As shown, the primary feed pipe includes a cylindrical section 13 and a conical section 14, the primary feed port 11 is arranged in the cylindrical section 13, one end of the conical section 14 is connected to the cylindrical section 13, and the other end extends in a direction away from the cylindrical section 13 and the cross-sectional area gradually decreases, and at least a partial area within the conical section 14 constitutes the return zone.

[0062] Specifically, the primary discharge port 12 is located at one end of the conical section 14 away from the cylindrical section 13 and its projection toward the cylindrical section 13 falls within the secondary feed port 21. When the sludge mixture enters the primary separation tube 1 from the primary feed port 11, the sludge mixture is restricted by the wall of the primary separation tube 1, so that the sludge mixture rotates along the wall of the primary separation tube 1 toward the primary discharge port 12. When it moves to the conical section 14, the inner diameter of the conical section 14 gradually decreases, and the rotation speed of the sludge mixture will continue to accelerate. Due to the uneven pressure distribution along the radial direction when the sludge mixture flows in a spiral direction, the closer it is to the axis of the primary separation tube 1, the smaller it is and approaches zero when it reaches the axis, becoming a low-pressure area or even a vacuum area, causing the sludge mixture to move toward the axial direction. At the same time, due to the gradual reduction of the aperture at the bottom of the conical section 14, the sludge mixture cannot be quickly discharged from the primary discharge port 12, and the secondary feed port 21 is in a low-pressure area, forcing the sludge mixture to move from the high-pressure area to the secondary feed port 21 in the low-pressure area, thereby forming a return of the sludge mixture. Figure 6 As shown, taking the first-level separation tube 1 set vertically as an example, affected by the spiral flow of the sludge mixture, the air pressure in the area close to the axis is relatively low, and the sludge mixture gradually moves closer to the axis of the first-level separation tube 1 during the spiral movement from top to bottom, while the high-quality activated sludge in the sludge mixture has a relatively large density and is subjected to a relatively large centrifugal force. As the rotation speed increases, the centrifugal force continues to increase. When the centrifugal force is greater than the liquid resistance of the sludge mixture to it, the activated sludge will move toward the wall of the first-level separation tube 1 and separate from the sludge mixture; and the sludge mixture entering the conical section 14 has a continuously increasing rotation speed, and the more it moves downward, the faster its spiral flow speed is, and the space at the bottom of the conical section 14 is relatively small, so the sludge mixture cannot be discharged in time, so it spirals from bottom to top to the secondary feed port 21 in the low-pressure zone. That is, the return force of the lower return zone in this embodiment refers to the pressure from the high-pressure zone around the first-level separation tube 1 to the low-pressure zone at its axis.

[0063] Implementation method 2: Figure 1 As shown, it also includes a reflector 4 arranged in the return zone, a flow gap 5 is arranged between the reflector 4 and the tube wall of the first-stage separation tube 1, and the reflector 4 has a reflective surface 41 facing the second-stage feed port 21. Figure 1As shown, taking the vertical setting of the first-level separation tube 1 as an example, affected by the spiral flow of the sludge mixture, the air pressure in the area close to the axis is relatively low, and the sludge mixture gradually approaches the axis of the first-level separation tube 1 during the spiral movement from top to bottom, while the high-quality activated sludge in the sludge mixture has a large density and is subjected to a large centrifugal force. When the centrifugal force is greater than the liquid resistance of the sludge mixture to it, the activated sludge will move toward the wall of the first-level separation tube 1, separate from the sludge mixture, and slide through the flow gap 5 to the first-level discharge port 12; when the sludge mixture moves to the return zone, it changes its movement direction due to the reflection effect of the reflector 4, thereby spirally rising from bottom to top to the second-level feed port 21 and entering the second-level separation tube 2.

[0064] Preferably, the primary separation pipe 1 is provided with an inward section, and the activated sludge after the primary separation is gathered and collected to the primary discharge port 12 under the action of the pipe wall of the inward section.

[0065] As a preferred embodiment of the second implementation mode, Figure 1 As shown, the ratio of the width of the flow gap 5 to the width of the reflecting surface 41 is 11%-25%. In this way, the reflecting surface 41 has a sufficient reflecting width, thereby providing a return force to the sludge mixture, reducing the probability that the sludge mixture fails to contact the reflecting surface 41 and flows out of the flow gap 5; in addition, sufficient movement space is reserved for the separated activated sludge, reducing the probability of blockage of the separated activated sludge. Figure 1 Schematically depicting the width of the flow gap 5 and the width of the reflecting surface 41 , L1 and L2 refer to the width of the flow gap, L3 refers to the width of the reflecting surface 41 , 11%<L1 / L3<25%, 11%<L2 / L3<25%.

[0066] As a preferred embodiment of the present application, Figure 1 As shown, it also includes a pumping assembly 6, which includes a variable frequency pump 61 and a conveying pipe 62. The variable frequency pump 61 conveys the sludge mixed liquid to the primary feed port 11 through the conveying pipe 62. The variable frequency pump 61 can adjust the pumping power to adjust the speed at which the sludge mixed liquid enters the primary separation pipe 1. Since the centrifugal force of the sludge mixed liquid in the spiral flow process is proportional to the movement speed, the variable frequency pump 61 is provided to convey the sludge mixed liquid to the primary separation pipe 1 at different speeds, provide different initial velocities for the sludge mixed liquid, and adjust the centrifugal force of the sludge mixed liquid according to the separation needs for sludge mixed liquids with different components and different separation requirements.

[0067] Preferably, the primary discharge port is connected to the activated sludge tank, and the separated activated sludge is discharged into the activated sludge tank through the primary discharge port. The feed pipe 62 is connected to the activated sludge tank, and the activated sludge in the activated sludge tank is transported to the sludge screener for separation and purification through the pumping component 6.

[0068] Anything not described in this application can be achieved by adopting or drawing on existing technologies.

[0069] The various embodiments in this specification are described in a progressive manner, and the same or similar parts between the various embodiments can be referenced to each other, and each embodiment focuses on the differences from other embodiments.

[0070] The above is only an embodiment of the present application and is not intended to limit the present application. For those skilled in the art, the present application may have various changes and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the scope of the claims of the present application.

Claims

1. A sludge screener for separating activated sludge from a sludge mixture, characterized in that: It comprises a primary separation pipe and a secondary separation pipe, wherein the primary separation pipe comprises a primary feed port and a primary discharge port, the secondary separation pipe has a secondary feed port connected to the primary separation pipe, the primary feed port is used to pump the sludge mixed liquid into the primary separation pipe, and the sludge mixed liquid is initially separated during the process of flowing in a spiral flow along the wall of the primary separation pipe toward the primary discharge port; A turning zone is provided in the first-stage separation tube on the flow path of the sludge mixed liquid toward the first-stage discharge port, so that the sludge mixed liquid changes its movement direction through the turning zone during its flow toward the first-stage discharge port and enters the second-stage separation tube through the second-stage feed port in the form of spiral flow; The sludge screen also includes a secondary separation element, which can transport separation liquid to the secondary separation pipe and form a separation vortex around the sludge mixed liquid to increase the centrifugal force of the sludge mixed liquid.

2. The sludge screening device according to claim 1, characterized in that: The secondary separation component includes a pump liquid component and a closed shell. The closed shell cooperates with the secondary separation tube to form a liquid supply cavity. The tube wall of the secondary separation tube is provided with a plurality of infusion ports connected to the liquid supply cavity. The pump liquid component can transport separation liquid to the liquid supply cavity.

3. The sludge screening device according to claim 2, characterized in that: The angle α between the plane where the opening direction of the infusion port is located and the plane where the tangent line of the cross-section circle of the secondary separation tube is located satisfies 0°<α≤30°, and / or the angle β between the plane where the opening direction of the infusion port is located and the tube wall of the secondary separation tube satisfies 70°≤β≤85°.

4. The sludge screening device according to claim 2 or 3, characterized in that: The secondary separation element also includes an infusion tube connected to the infusion port, the extension direction of the infusion tube is consistent with the opening direction of the infusion port, and the separation liquid in the liquid supply cavity is transported to the secondary separation tube through the infusion tube.

5. The sludge screening device according to claim 2, characterized in that: A plurality of infusion groups are arranged at intervals along the extension direction of the secondary separation tube, and the infusion groups include a plurality of infusion ports whose projections toward the axial direction of the secondary separation tube overlap.

6. The sludge screening device according to claim 1, characterized in that: The first-stage separation tube and the second-stage separation tube both extend in a vertical direction, and an extension line of an axis of the first-stage separation tube coincides with an extension line of an axis of the second-stage separation tube.

7. The sludge screening device according to claim 1, characterized in that: The first-level feed pipe includes a cylindrical section and a conical section. The first-level feed port is arranged in the cylindrical section. One end of the conical section is connected to the cylindrical section, and the other end extends in a direction away from the cylindrical section with a gradually decreasing cross-sectional area. At least a partial area within the conical section constitutes the return zone.

8. The sludge screening device according to claim 1, characterized in that: It also includes a reflection plate arranged in the return zone, a flow gap is arranged between the reflection plate and the tube wall of the first-stage separation tube, and the reflection plate has a reflection surface facing the second-stage feed port.

9. The sludge screening device according to claim 8, characterized in that: The ratio of the width of the flow gap to the width of the reflecting surface is 11%-25%.

10. The sludge screening device according to claim 1, characterized in that: It also includes a pumping component, which includes a variable frequency pump and a feed pipe. The variable frequency pump delivers the sludge mixture to the primary feed inlet through the feed pipe. The variable frequency pump can adjust the pumping power to adjust the speed at which the sludge mixture enters the primary separation pipe.

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