Separating device for magnetic carrier and sludge

Abstract

The invention discloses a magnetic carrier and sludge separation device, and aims to overcome the defect that an existing magnetic carrier is difficult to separate from sludge. The device comprises a rotational flow cylinder, a feeding pipe, an overflow pipe and a magnetic force adjusting structure, the rotational flow cylinder comprises an upper cylinder and a lower conical barrel, an underflow opening is formed in the bottom of the conical barrel, the feeding pipe is communicated with the rotational flow cylinder along the tangent line of the cylinder, the overflow pipe is arranged on the upper portion of the rotational flow cylinder and is coaxial with the rotational flow cylinder, and the magnetic force adjusting structure is arranged on the lower portion of the rotational flow cylinder. The magnetic force adjusting structure is arranged at the lower part of the cyclone cylinder and generates a magnetic field; and the magnetic field improves the separation efficiency of the magnetic carrier and the sludge. Sludge and the magnetic carrier are separated through magnetic force and gravity of the magnetic field on the magnetic carrier, the separation efficiency is improved, and the magnetic carrier can be reused.

Description

Technical Field

[0001] The invention relates to the field of sewage treatment, and more particularly to a device for separating magnetic carriers and sludge. Background Art

[0002] In the sewage treatment process, biological treatment is highly dependent. The biodegradability of sewage is improved through conditioning. By providing microorganisms with oxygen-rich, anaerobic and anaerobic environments, the biological activities of various microbial populations under different oxygen contents are utilized to fix free nitrogen, phosphorus and other elements to form sludge. The precipitation of solidified sludge is accelerated by flocculants, thereby separating the sludge from the water body. This process is the general sewage treatment process.

[0003] In order to reduce the residence time of water flow and speed up flocculation, magnetic flocculants are used with relevant technology to make suspended matter adsorb and flocculate with magnetic flocculants to form larger flocs. As the coagulation time increases, the flocs gradually increase and settle to the bottom of the sewage, thereby achieving the removal of suspended matter. The reason why magnetic flocculants settle faster than general flocculants is that magnetic flocculants have a higher specific gravity and can be separated from the clear liquid faster with the help of magnetic separation devices.

[0004] The related technology also provides an iron-based magnetic carbon carrier based on magnetic flocculation, which uses its porous and positively charged properties to directly serve as a nucleating agent for granular sludge cultivation in the biochemical process.

[0005] However, current magnetic carriers are mixed with sludge and are difficult to separate. Summary of the invention

[0006] The invention overcomes the defect that the existing magnetic carrier is difficult to separate from the sludge, and provides a magnetic carrier and sludge separation device which can separate the magnetic carrier and the sludge by utilizing magnetism.

[0007] In order to solve the above technical problems, the present invention adopts the following technical solutions: A magnetic carrier and sludge separation device is used to separate the magnetic carrier and the sludge, comprising a cyclone cylinder, a feed pipe, an overflow pipe and a magnetic adjustment structure, wherein the cyclone cylinder comprises an upper cylindrical cylinder and a lower conical barrel, a bottom flow port is provided at the bottom of the conical barrel, the feed pipe is connected to the cyclone cylinder along the tangent of the cylindrical cylinder, the overflow pipe is arranged at the upper part of the cyclone cylinder and is coaxial with the cyclone cylinder, and the magnetic adjustment structure is arranged at the lower part of the cyclone cylinder and generates a magnetic field, and the magnetic field improves the separation efficiency of the magnetic carrier and the sludge.

[0008] The separation device uses a high-velocity mixed flow to enter the cyclone through a tangent line, and moves downward in a spiral under gravity. Restricted by the cone barrel, the further the mixed flow moves downward, the higher the flow velocity, forming the external cyclone (also referred to as the rotation direction below). Under the action of centrifugal force, the material with higher density occupies the external space, while the material with lower density is located on the inside. Since the bottom flow port of the cyclone separator is greatly reduced, the liquid cannot be quickly discharged from the bottom flow port, and the overflow port in the center of the top cover of the cyclone chamber moves part of the fluid toward it because it is in a low-pressure area, thus forming an upward rotational motion and being discharged from the overflow port. For the mixed flow of the present application, the magnetic carrier and the sludge adsorbed on the outside can be separated by density difference, the magnetic carrier can be discharged from the bottom flow port, and the sludge can be discharged from the overflow port as overflow.

[0009] Preferably, the overflow tube is provided with a propeller blade outside, and the propeller blade is fixedly connected to the tube wall of the overflow tube. The rotation direction of the propeller blade is consistent with the rotation direction of the material in the separation device, and the spiral angle of the propeller blade points to the top of the cyclone tube. The structure is used to reduce energy dissipation. Specifically, there is a short-circuit flow that does not participate in the external cyclone and the internal cyclone near the top of the cyclone tube. The short-circuit flow flows along the side wall, top cover and overflow tube of the cylindrical tube, and finally merges with the internal cyclone and is discharged from the overflow port of the overflow tube. The present application makes improvements on this, and a propeller blade fixedly connected to the outer wall of the overflow tube is provided. When the mixed flow enters the cyclone tube, the cyclone directions of the mixed flow are in the same direction at all places, and the liquid in the propeller blade also rotates synchronously to form a spiral flow. Under the influence of the shape of the propeller blade, the liquid in the propeller blade moves upward, which is opposite to the flow direction of the liquid in the short-circuit flow, thereby interrupting the short-circuit flow, reducing energy dissipation, and reducing the amount of unseparated materials.

[0010] Preferably, the magnetic force adjustment structure comprises an excitation device arranged on the periphery of the cone barrel, and the magnetic field is provided by the excitation device.

[0011] Preferably, there are several excitation devices, which are arranged at equal intervals around the cone barrel. The structure generates a uniform magnetic field.

[0012] Preferably, each excitation device is alternately divided into N excitation groups, and the excitation groups are energized alternately. The structure is used to prevent magnetic carriers from being adsorbed and accumulated.

[0013] Preferably, the inner wall of the cone barrel near the bottom flow outlet is embedded with a plurality of convex strips, and the length direction of the convex strips is arranged along the height direction. The magnetic carrier is adsorbed by the structure, so that this part of the magnetic carrier produces relative movement relative to the rotation direction, thereby increasing the probability of friction. Through friction, the stubborn sludge attached to the surface of the magnetic carrier is peeled off, the agglomerated magnetic carrier is separated, and the activity of the magnetic carrier is restored. The arrangement of the convex strips is such that the impact of the spiral fluid and the vertical convex strips will generate a downward component force, forcing the magnetic carrier to sink faster than the swirl, and because the sludge is peeled off, the magnetic carrier has a higher specific gravity and a greater density, and is easier and more preferentially discharged from the bottom flow outlet.

[0014] Preferably, the cross section of the convex strip is provided with an embedding portion and a protruding portion for installation in the cone barrel, the edge of the protruding portion is an asymmetric arc, and the curvature of the upstream portion is smaller than that of the downstream portion. The shape of the convex strip can reduce the total resistance of the swirl flow and reduce energy consumption.

[0015] Preferably, the excitation device is connected to the convex strip, and the excitation device can magnetize the convex strip. Through the above structure, the magnetism of the convex strip can be improved, and the efficiency of the frictional stripping of sludge can be improved.

[0016] Preferably, the cross section of the feed pipe is rectangular. The structure can reduce the wear on the cyclone cylinder.

[0017] Compared with the prior art, the present invention has the following beneficial effects: (1) The sludge and magnetic carrier are separated by the magnetic force of the magnetic field on the magnetic carrier and the gravity, so that the magnetic carrier can be reused; (2) The magnetic carrier is adsorbed by the convex strips, and the magnetic carrier and the mixed flow are moved relative to each other. The collision and friction are used to further peel off the fixed sludge, thus eliminating the subsequent shear magnetic separation process. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 is a schematic diagram of the present invention; Figure 2 is a schematic diagram of an overflow pipe of the present invention; Figure 3 It is a schematic diagram of the convex strip of the present invention; Figure 4 It is a schematic diagram of the arrangement of the convex strips and the excitation device of the present invention; In the figure: Cyclone tube 1, cylindrical tube 2, cone barrel 3, feeding pipe 4, overflow pipe 5, propeller blade 6, regulating wing 7, excitation device 8, bottom flow port 9, convex strip 10, protruding part 11, embedded part 12, external vortex 13, internal vortex 14, short-circuit flow 15. DETAILED DESCRIPTION

[0019] The present disclosure is further described below in conjunction with the accompanying drawings and embodiments.

[0020] It should be noted that the following detailed descriptions are illustrative and are intended to provide further explanation of the present application. Unless otherwise specified, all technical and scientific terms used herein have the same meanings as those commonly understood by those skilled in the art to which the present application belongs.

[0021] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0022] In the present disclosure, terms such as "upper", "lower", "left", "right", "front", "back", "vertical", "horizontal", "side", "bottom" and the like indicating directions or positional relationships are based on the directions or positional relationships shown in the accompanying drawings. They are relational words determined only for the convenience of describing the structural relationships of the various parts or elements of the present disclosure, and do not specifically refer to any part or element in the present disclosure and should not be understood as limitations on the present disclosure.

[0023] In the present disclosure, terms such as "fixed connection", "connected", "connection", etc. should be understood in a broad sense, indicating that it can be fixedly connected, integrally connected or detachably connected; it can be directly connected or indirectly connected through an intermediate medium. For relevant scientific research or technical personnel in this field, the specific meanings of the above terms in the present disclosure can be determined according to specific circumstances, and they cannot be understood as limitations on the present disclosure.

[0024] Example: A magnetic carrier and sludge separation device is used for separating magnetic carrier and sludge.

[0025] The separation carrier is connected to the secondary sedimentation tank of the existing sewage treatment production line to receive the mixed flow of water, sludge and magnetic carrier. Among them, the magnetic carrier is used as a flocculant in the existing production line to flocculate the suspended solids in the water, and also as a nucleus for the attachment of bacteria. As a magnetic carrier with magnetic properties, the magnetic carrier will agglomerate to make the granular sludge stable and dense.

[0026] The separation device comprises a cyclone 1, a feed pipe 4, an overflow pipe 5 and a magnetic force adjustment structure. The feed pipe 4 is connected to the existing secondary sedimentation tank through a pipeline, and the kinetic energy is provided by the pump body, and the pipe diameter is reduced to accelerate the mixed flow.

[0027] The cyclone 1 comprises an upper cylindrical tube 2 and a lower conical barrel 3, wherein the top of the cylindrical tube 2 is closed and the lower part is connected to the conical barrel 3. An overflow pipe 5 is arranged at the upper part of the cyclone 1 and is coaxial with the cyclone 1, and the overflow pipe 5 is inserted into the cyclone 1. A bottom flow port 9 is arranged at the bottom of the conical barrel 3.

[0028] The feed pipe 4 is connected to the cyclone drum 1 along the tangent line of the cylindrical drum 2, and the cross section of the feed pipe 4 is rectangular. The structure can reduce the wear on the cyclone drum 1.

[0029] The magnetic force regulating structure is arranged at the lower part of the cyclone 1 and generates a magnetic field, which improves the separation efficiency of the magnetic carrier and the sludge. The cyclone is made of non-magnetic conductive material. This arrangement enables the magnetic flux lines to pass through the outer shell of the cyclone 1 and act on the mixed flow.

[0030] In some embodiments, a propeller blade 6 is provided outside the overflow pipe 5, and the propeller blade 6 is fixedly connected to the pipe wall of the overflow pipe 5. The rotation direction of the propeller blade 6 is consistent with the rotation direction of the material in the separation device, and the spiral angle of the propeller blade 6 points to the top of the cyclone cylinder 1.

[0031] The mixed flow has a flow form of short-circuit flow 15 in the cyclone tube 1. The short-circuit flow 15 circulates along the side wall, top cover and overflow pipe 5 of the cylindrical tube 2, and finally merges with the inner cyclone 14 and is discharged from the overflow port of the overflow pipe 5. The short-circuit flow 15 consumes the kinetic energy of the mixed flow and directly enters the overflow product without separation, which directly affects the separation effect.

[0032] The present application makes an improvement on this, and sets a propeller blade 6 fixedly connected to the outer wall of the overflow pipe 5. When the mixed flow enters the cyclone tube 1, the cyclone directions of the mixed flow are in the same direction, and the liquid in the propeller blade 6 also rotates synchronously along the path defined by the propeller blade 6. Under the influence of the shape of the propeller blade 6, the liquid in the propeller blade 6 moves upward, which is opposite to the flow direction of the liquid in the short-circuit flow 15, thereby interrupting the short-circuit flow 15, reducing energy dissipation, and reducing the amount of unseparated materials.

[0033] In some embodiments, the edge of the propeller blade 6 is provided with an adjustment wing 7, and the adjustment wing 7 is made of a flexible material, and the adjustment wing 7 is tilted upward without being acted upon by an external force. This structure is to further reduce energy consumption on the basis of the aforementioned propeller blade 6. The propeller blade 6 arranged outside the aforementioned overflow pipe 5 makes the mixed flow move upward, opposite to the flow direction of the short-circuit flow 15, so that the two offset each other and destroy the circulation formation of the short-circuit flow 15. This requires the flow velocity of the mixed flow, the shape of the cyclone 1, the feed viscosity of the mixed flow, the shape of the propeller blade 6, etc. to match, so as to achieve a just symmetrical effect. If the pressure generated by the short-circuit flow 15 is greater than the lift generated by the propeller blade 6, the short-circuit flow 15 will be weakened but still exist; otherwise, it will cause a waste of the kinetic energy of the mixed flow. This requires the targeted manufacture of the overflow pipe 5 with the propeller blade 6, which will increase the cost. Therefore, this embodiment provides a flexible adjustment wing 7 installed on the edge of the propeller blade 6.

[0034] In some embodiments, the regulating wing 7 is installed on the end of the propeller blade 6 by secondary molding. In this embodiment, the end of the propeller blade 6 is provided with a socket for accessing the root of the regulating wing 7 .

[0035] The regulating wing 7 changes its shape according to the pressure of the short-circuit flow 15 to increase or decrease the lift of the driven mixed flow. Specifically, when the power of the short-circuit flow 15 is greater than the lift of the propeller blades 6 and the regulating wing 7, the regulating wing 7 is subjected to downward pressure, thereby expanding the volume of the propeller blades 6 that affects the mixed flow, thereby generating more lift during the spiral motion, and offsetting the downward force of the short-circuit flow 15; when the pressure generated by the short-circuit flow 15 is small, the regulating wing 7 is tilted upward under the action of its own elasticity, thereby reducing the amount of influence on the mixed flow, and the corresponding lift is weaker, reducing the waste of kinetic energy of the mixed flow. This structure can make the propeller blades 6 more adaptable and versatile, can further reduce the kinetic energy loss of the mixed flow, and can also be widely used in cyclones of different scenarios and specifications.

[0036] In some embodiments, the magnetic force regulating structure includes an excitation device 8 disposed on the periphery of the cone barrel 3. The magnetic field is provided by the excitation device 8. The number of the excitation devices 8 is several, and the excitation devices 8 are arranged at equal intervals around the cone barrel 3. The structure generates a uniform magnetic field. Each excitation device 8 is alternately divided into N excitation groups, and the excitation groups are alternately energized. The structure prevents magnetic carriers from being adsorbed and accumulated.

[0037] Since the magnetic carrier carries both the role of bacterial strain and flocculant, the magnetic carrier not only aggregates with other magnetic carriers, but also includes sludge particles that are easily separated during flocculation, and fixed sludge growing on the surface of the magnetic carrier from the outside to the inside. The surface of the magnetic carrier has a porous structure to increase its surface area. The bacterial colony structure growing on the magnetic carrier fills the surface of the magnetic carrier, with aerobic colonies growing on the outermost layer, facultative anerobic colonies living in the middle layer, and anaerobic colonies growing in the inner layer. With the recycling of the magnetic carrier, its bacterial layer will continue to thicken, resulting in a decrease in the proportion of aerobic bacteria in the outermost layer, a decrease in the proportion of aerobic bacteria, the disappearance of facultative anerobic colonies in the middle layer that cannot obtain oxygen and die, and the growth of anaerobic bacteria, which will cause an imbalance between aerobic, facultative anerobic, and anaerobic bacteria, and will also affect the effectiveness of aeration during sewage treatment.

[0038] According to common knowledge, the method of use is to peel off the fixed bacterial layer through a shearing machine and a magnetic separation device, and maintain the volume within a certain range during the circulation life of the magnetic carrier. However, this method requires the installation of additional equipment. This embodiment is improved on this basis, so that the separation device has a grinding function, reuses its separation function, and only directly peels off the flocculated sludge and the bacterial colony structure growing on the magnetic carrier in the separation device, thereby reducing the volume of the group with the magnetic carrier as the sclerotium, maintaining the number ratio of aerobic, facultative anoxic and anaerobic bacteria in the bacterial group in the subsequent recycling, maintaining the normal sewage treatment function, and improving robustness.

[0039] The inner wall of the cone barrel 3 near the bottom flow port 9 is embedded with a plurality of convex strips 10, and the length direction of the convex strips 10 is arranged along the height direction. The magnetic carrier is adsorbed by the structure, so that this part of the magnetic carrier produces relative movement relative to the rotation direction, thereby increasing the probability of friction. Through friction, the stubborn sludge attached to the surface of the magnetic carrier is peeled off, the agglomerated magnetic carrier is separated, and the activity of the magnetic carrier is restored. The arrangement of the convex strips 10 makes the spiral fluid impact and the vertical convex strips 10 produce a downward component force, forcing the magnetic carrier to sink faster than the swirl, and because the sludge is peeled off, the magnetic carrier has a higher specific gravity and a higher density, and is easier and more preferentially discharged from the bottom flow port 9. The cross section of the convex strip 10 is provided with an embedded portion 12 and a protruding portion 11 for installation in the cone barrel 3, and the edge of the protruding portion 11 is an asymmetric arc, and the curvature of the upstream portion is smaller than that of the downstream portion. The shape of the convex strip 10 can reduce the total resistance to the swirl and reduce energy consumption.

[0040] The excitation device 8 is connected to the convex strips 10, and the excitation device 8 can magnetize the convex strips 10. With the above structure, the magnetism of the convex strips 10 can be improved, and the efficiency of the frictional stripping of sludge can be improved.

[0041] When the excitation device 8 is started, the convex strip 10 connected to the excitation device 8 is magnetized, and the magnetized convex strip 10 attracts magnetic carriers. Some magnetic carriers adhere to the outer edge of the protruding part 11 of the convex strip 10 near the upstream direction, and rub and collide with the magnetic carriers flowing with the mixed flow, thereby peeling off the bacterial layer on its surface. Since the convex strip 10 is vertically arranged in the height direction, the mixed flow will provide the convex strip 10 in a static state with an inclined force in the direction of the mixed flow. The convex strip 10 attached to the convex strip moves on the surface of the convex strip 10 or other magnetic carriers for a certain period of time under the pressure of the outer vortex 13 of the mixed flow, and then detaches from the convex strip 10 with the outer vortex 13. The convex strip 10 is located at the bottom of the cyclone, and the detached magnetic carrier flows out from the bottom flow port 9, and the peeled bacterial layer debris follows the inner vortex 14 into the overflow pipe 5 for discharge.

[0042] The final mixed flow includes sludge aggregated by flocculation, fixed sludge under stripping, magnetic carriers that have not been stripped, and magnetic carriers after stripping, from small to large specific gravity. The latter two are discharged from the bottom flow port 9, and the former two are discharged from the overflow port. With the recycling of magnetic carriers, the volume of magnetic carriers can be controlled within a certain range.

[0043] In production practice, lining the inner wall of the hydrocyclone with smooth wear-resistant rubber will increase the flow resistance and reduce the separation efficiency. The inner surface roughness and assembly accuracy of the hydrocyclone have little effect on its production capacity, separation efficiency and other performance parameters. Therefore, the convex strips 10 provided in the present application have little effect on the production capacity and separation efficiency.

[0044] As the excitation group switches, the convex strips 10 to which the magnetic carrier is attached lose their magnetism, and the magnetic carrier is only connected to the convex strips 10 by surface tension. As the mixed flow swirls, the magnetic carrier separates from the convex strips 10. This structure can avoid the accumulation of magnetic carriers and increase the resistance in the cyclone 1.

[0045] The separation device uses a high-velocity mixed flow to enter the cyclone tube 1 through a tangent line, and moves downward in a spiral under gravity. Restricted by the cone barrel 3, the further the mixed flow moves downward, the higher the flow velocity, forming the outer cyclone 13 (also referred to as the rotation direction below). Under the action of centrifugal force, the material with higher density occupies the external space, while the material with lower density is located on the inside. Since the bottom flow port 9 of the cyclone separator is greatly reduced, the liquid cannot be quickly discharged from the bottom flow port 9, and the overflow port in the center of the top cover of the cyclone chamber moves part of the fluid toward it because it is in a low-pressure area, thus forming an upward rotational motion and being discharged from the overflow port. For the mixed flow of the present application, the magnetic carrier and the sludge adsorbed on the outside can be separated by density difference, the magnetic carrier can be discharged from the bottom flow port 9, and the sludge can be discharged from the overflow port as overflow.

[0046] The embodiments described above are only preferred solutions of the present invention and are not intended to limit the present invention in any form. Other variations and modifications are possible without exceeding the technical solutions described in the claims.

Claims

1. A magnetic carrier and sludge separation device for separating magnetic carrier and sludge, characterized in that: It includes a cyclone cylinder, a feeding pipe, an overflow pipe and a magnetic adjustment structure. The cyclone cylinder includes an upper cylindrical cylinder and a lower conical barrel. The bottom of the conical barrel is provided with an underflow port. The feeding pipe is connected to the cyclone cylinder along the tangent of the cylindrical cylinder. The overflow pipe is arranged at the upper part of the cyclone cylinder and is coaxial with the cyclone cylinder. The magnetic adjustment structure is arranged at the lower part of the cyclone cylinder and generates a magnetic field. The magnetic field improves the separation efficiency of the magnetic carrier and the sludge.

2. The device for separating magnetic carrier and sludge according to claim 1, characterized in that: A propeller blade is arranged outside the overflow pipe, and the propeller blade is fixedly connected to the pipe wall of the overflow pipe. The rotation direction of the propeller blade is consistent with the rotation direction of the material in the separation device, and the spiral angle of the propeller blade points to the top of the cyclone cylinder.

3. The device for separating magnetic carrier and sludge according to claim 2, characterized in that: The magnetic force adjustment structure includes an excitation device arranged on the periphery of the cone barrel.

4. The device for separating magnetic carrier and sludge according to claim 3, characterized in that: There are several excitation devices, and the excitation devices are arranged at equal intervals around the cone barrel.

5. The device for separating magnetic carrier and sludge according to claim 4, characterized in that: Each excitation device is alternately divided into N excitation groups, and the excitation groups are energized alternately.

6. The device for separating magnetic carrier and sludge according to claim 1, characterized in that: A plurality of convex strips are embedded in the inner wall of the cone barrel close to the bottom flow outlet, and the length direction of the convex strips is arranged along the height direction.

7. The device for separating magnetic carrier and sludge according to claim 6, characterized in that: The cross section of the convex strip is provided with an embedding portion and a protruding portion for installation in the conical barrel, the edge of the protruding portion is an asymmetric arc, and the curvature of the upstream portion is smaller than that of the downstream portion.

8. A magnetic carrier and sludge separation device according to claim 4 or 7, characterized in that: The excitation device is connected to the convex strip, and the excitation device can magnetize the convex strip.

9. The device for separating magnetic carrier and sludge according to claim 1, characterized in that: The cross section of the feeding pipe is rectangular.

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