Sludge concentration and dewatering equipment based on synergistic effect of electric field and rotational flow field

Abstract

This invention provides a sludge thickening and dewatering device based on the synergistic effect of an electric field and a vortex field, relating to the field of sludge treatment technology. The device includes a vertical tank, an electric field pretreatment structure, an electric field vortex dewatering structure, and a high-voltage power supply. The electric field pretreatment structure is located outside the vertical tank, its outlet is connected to the vertical tank, and it is tangent to the side wall of the tank. The electric field vortex dewatering structure is installed inside the vertical tank. Both the electric field pretreatment structure and the electric field vortex dewatering structure are electrically connected to the high-voltage power supply. The sludge is first pretreated by the high-frequency, high-voltage AC electric field generated by the electric field pretreatment structure, and then enters the vertical tank in a vortex manner. The high-frequency, high-voltage AC electric field generated by the electric field vortex dewatering structure performs secondary treatment on the sludge entering the vertical tank.

Description

Technical Field

[0001] This invention relates to the field of sludge treatment technology, and in particular to a sludge thickening and dewatering device based on the synergistic effect of electric field and swirling field. Background Technology

[0002] In recent years, with the continuous increase in wastewater treatment volume, sludge production has also risen accordingly. To alleviate the treatment pressure caused by sludge production, a highly efficient sludge thickening technology is urgently needed. Sludge is a byproduct of wastewater treatment and may contain a large amount of toxic and harmful substances. It must be reduced, rendered harmless, and stabilized before discharge. A typical sludge treatment process includes sludge thickening, sludge digestion, dewatering and drying, and sludge disposal. Sludge disposal has certain requirements regarding sludge moisture content. To promptly treat toxic and harmful substances and utilize beneficial substances, sludge must be thickened and dewatered to reduce its organic matter content and moisture content, thereby reducing the sludge volume and facilitating transportation and disposal. Therefore, sludge thickening and dewatering is a key approach to reducing sludge volume and achieving sludge reduction, rendering harmless, and stabilizing. It is also a crucial link affecting the efficiency and cost of subsequent digestion and disposal.

[0003] Current sludge thickening and dewatering methods primarily rely on gravity settling, which suffers from drawbacks such as long processing time, low efficiency, and large footprint. While horizontal spiral thickeners offer higher efficiency, they suffer from poor operational stability and high costs. Both gravity settling and centrifugal separation can only separate free water and some interstitial water from the sludge, failing to remove bound water. Therefore, how to further remove bound water from the sludge while maintaining a small footprint and high thickening and dewatering efficiency is a pressing issue that sludge thickening and dewatering equipment must address. Summary of the Invention

[0004] The purpose of this invention is to provide a sludge thickening and dewatering device based on the synergistic effect of electric field and swirling field. The various technical effects of the preferred technical solutions provided by this invention are described in detail below.

[0005] To achieve the above objectives, the present invention provides the following technical solution:

[0006] This invention provides a sludge thickening and dewatering device based on the synergistic effect of an electric field and a cyclone field, comprising a vertical tank, an electric field pretreatment structure, an electric field cyclone dewatering structure, and a high-voltage power supply. The electric field pretreatment structure is located outside the vertical tank, its outlet is connected to the vertical tank, and it is tangent to the side wall of the vertical tank. The electric field cyclone dewatering structure is installed inside the vertical tank, and both the electric field pretreatment structure and the electric field cyclone dewatering structure are electrically connected to the high-voltage power supply.

[0007] The sludge is first pretreated by the high-frequency, high-voltage AC electric field generated by the electric field pretreatment structure, and then enters the vertical tank in a swirling manner. The high-frequency, high-voltage AC electric field generated by the electric field swirling dewatering structure performs secondary treatment on the sludge entering the vertical tank.

[0008] Optionally, the electric field pretreatment structure includes a cylindrical insulated electrode, a metal tube, and an electrode support. The cylindrical insulated electrode is fixed inside the metal tube by the electrode support. The central axes of the cylindrical insulated electrode and the metal tube coincide. One end of the cylindrical insulated electrode is connected to the positive terminal of the high-voltage power supply, and the metal tube is connected to the negative terminal of the high-voltage power supply. A pretreatment channel exists between the cylindrical insulated electrode and the metal tube, and a high-frequency high-voltage alternating electric field is generated in the pretreatment channel.

[0009] Optionally, the electric field pretreatment structure further includes an inlet pipe, an insulating bend, and a tangential pipe. The inlet pipe, the insulating bend, the metal circular pipe, and the tangential pipe are connected in sequence via flanges. One end of the cylindrical insulating electrode extends through the side wall of the insulating bend and is connected to the positive terminal of the high-voltage power supply. The tangential pipe is connected to the lower part of the vertical tank and is tangential to the side wall of the vertical tank.

[0010] Optionally, a first insulating layer is provided on the outer surface of the cylindrical insulating electrode, the thickness of which is 0.5 to 1.5 mm.

[0011] Optionally, the first insulating layer is formed by spraying aluminum oxide onto the outer surface of the cylindrical insulating electrode, or by casting epoxy resin onto the outer surface of the cylindrical insulating electrode.

[0012] Optionally, the electric field vortex dehydration structure includes a spatial electrode assembly, a vortex breaker, and a water-blocking weir plate. The spatial electrode assembly, the vortex breaker, and the water-blocking weir plate are installed sequentially from bottom to top inside the vertical tank. The spatial electrode assembly is electrically connected to the high-voltage power supply.

[0013] Optionally, the space electrode assembly includes a connecting cylinder, metal helical blades, insulating helical blades, and a fixing bracket. The metal helical blades are fixedly wound around the outer wall of the connecting cylinder in a helical direction, and the insulating helical blades are fixedly wound around the outer wall of the connecting cylinder in a helical direction. There are multiple metal helical blades and multiple insulating helical blades, which are spaced apart. The insulating helical blades are connected to the positive terminal of the high-voltage power supply, and the metal helical blades are connected to the negative terminal of the high-voltage power supply. The outer wall of the connecting cylinder is connected to the inner wall of the vertical tank through the fixing bracket.

[0014] Optionally, the outer surface of the insulating spiral blade is provided with a second insulating layer, the thickness of which is 2 to 4 mm.

[0015] Optionally, the vortex-breaking component includes a fixed cylinder and vortex-breaking blades. There are multiple vortex-breaking blades, all of which are distributed along the circumferential direction of the fixed cylinder. The two ends of the vortex-breaking blades are respectively connected to the outer wall of the fixed cylinder and the inner wall of the vertical tank.

[0016] Optionally, a sludge discharge pipe is provided at the bottom of the vertical tank, an exhaust pipe is provided at the top of the vertical tank, and a water outlet pipe is provided on the upper side wall of the vertical tank.

[0017] The water-blocking weir plate includes an overflow cylinder and an annular plate. The lower end of the overflow cylinder is connected to the inner wall of the vertical tank through the annular plate. The height of the annular plate is lower than the bottom height of the water outlet pipe, and the height of the upper end of the overflow cylinder is higher than the top height of the water outlet pipe.

[0018] This invention provides a sludge thickening and dewatering device based on the synergistic effect of an electric field and a swirling flow field. It features a vertical, compact structure, small footprint, and ease of transportation and installation. The electric field pretreatment structure and the electric field swirling flow dewatering structure are integrated into the vertical tank. The sludge is first pretreated by a high-frequency, high-voltage AC electric field generated by the electric field pretreatment structure. Under the action of the electric field, the cells within the sludge particles rupture, releasing the bound water and improving sludge fluidity. Then, it enters the vertical tank in a swirling flow. The high-frequency, high-voltage AC electric field generated by the electric field swirling flow dewatering structure performs secondary treatment on the sludge entering the vertical tank. Under the action of the electric field, the small-diameter bound water particles in the sludge coalesce into larger droplets for deep dewatering. Simultaneously, utilizing the centrifugal force of the swirling flow and the principle of shallow sedimentation, the separation of sludge and water phases is accelerated, enhancing the sludge dewatering effect, reducing processing time, and achieving higher thickening and dewatering efficiency. It achieves both cell wall breaking and thickening dewatering of sludge, featuring a small footprint and high dewatering efficiency. It is particularly suitable for urban wastewater treatment plants. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 This is a schematic diagram of the sludge thickening and dewatering equipment based on the synergistic effect of electric field and swirling flow field provided in an embodiment of the present invention;

[0021] Figure 2 This is a schematic diagram of the cylindrical insulated electrode of the sludge thickening and dewatering equipment based on the synergistic effect of electric field and swirling flow field provided in the embodiments of the present invention;

[0022] Figure 3 This is a schematic diagram of the spatial electrode assembly of the sludge thickening and dewatering device based on the synergistic effect of electric field and swirling field provided in an embodiment of the present invention;

[0023] Figure 4 This is a schematic diagram of the vortex-breaking component of a sludge thickening and dewatering device based on the synergistic effect of an electric field and a swirling flow field, provided in an embodiment of the present invention.

[0024] In the diagram: 1. Inlet pipe; 2. Cylindrical insulated electrode; 3. Insulated bend; 4. Electric field pretreatment structure; 5. Metal circular pipe; 6. Tangential pipe; 7. Electric field vortex dehydration structure; 8. Spatial electrode assembly; 9. Vortex breaker; 10. Weir plate; 11. Exhaust pipe; 12. Water outlet pipe; 13. Sludge discharge pipe; 14. Electrode support; 15. Fixed support; 16. Metal spiral blade; 17. Insulated spiral blade; 18. Vortex breaker blade; 19. Connecting cylinder; 20. Fixed cylinder. Detailed Implementation

[0025] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of this invention will be described in detail below. Obviously, the described embodiments are merely some embodiments of this invention, and not all embodiments. Based on the embodiments of this invention, all other implementation methods obtained by those skilled in the art without creative effort are within the scope of protection of this invention.

[0026] In the description of this invention, it should be noted that, unless otherwise stated, "a plurality of" means two or more; the terms "upper," "lower," "left," "right," "inner," "outer," "front end," "rear end," "head," "tail," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention. Furthermore, the terms "first," "second," "third," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0027] In the description of this invention, it should also be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0028] Electric field dewatering technology utilizes a high-frequency electric field to weaken the interfacial membrane strength of water droplets, promoting droplet aggregation and increasing particle size, thus accelerating sludge settling. Simultaneously, the instantaneous high-intensity electric field acts on the cell membranes of microorganisms within the sludge, creating a transmembrane potential difference. When this potential difference exceeds a critical value, it triggers membrane rupture or the formation of nanoscale pores, leading to the release of intracellular organic matter and bound water into the extracellular space. This process effectively disrupts extracellular polymeric substances (EPS) in the sludge, reducing its hydrophilicity and thus decreasing the bound water content.

[0029] This invention provides a sludge thickening and dewatering device based on the synergistic effect of an electric field and a vortex field. The device comprises a vertical tank, an electric field pretreatment structure 4, an electric field vortex dewatering structure 7, and a high-voltage power supply. The electric field pretreatment structure 4 is located outside the vertical tank, its outlet is connected to the vertical tank, and the electric field pretreatment structure 4 is tangent to the side wall of the vertical tank. The electric field vortex dewatering structure 7 is installed inside the vertical tank, and both the electric field pretreatment structure 4 and the electric field vortex dewatering structure 7 are electrically connected to the high-voltage power supply.

[0030] The sludge is first pretreated by the high-frequency, high-voltage AC electric field generated by the electric field pretreatment structure 4, and then enters the vertical tank in a swirling manner. The high-frequency, high-voltage AC electric field generated by the electric field swirling dewatering structure 7 performs secondary treatment on the sludge entering the vertical tank. This invention provides a sludge thickening and dewatering device based on the synergistic effect of an electric field and a swirling field. It features a vertical, compact structure, small footprint, and ease of transportation and installation. The electric field pretreatment structure 4 and the electric field swirling dewatering structure 7 are integrated on a vertical tank. The sludge is first pretreated by the high-frequency, high-voltage AC electric field generated by the electric field pretreatment structure 4. Under the action of the electric field, the cells within the sludge particles rupture, releasing the bound water inside, thus improving the sludge's fluidity. The sludge then enters the vertical tank in a swirling manner. The high-frequency, high-voltage AC electric field generated by the electric field swirling dewatering structure 7 performs secondary treatment on the sludge entering the vertical tank. Under the action of the electric field, the small-diameter bound water in the sludge particles agglomerates into large water droplets, achieving deep dewatering. Simultaneously, utilizing the centrifugal force of the swirling flow and the principle of shallow sedimentation, the separation of sludge and water phases is accelerated, enhancing the sludge dewatering effect, reducing processing time, and achieving higher thickening and dewatering efficiency. This device achieves both cell wall breaking and thickening / dewatering of the sludge, featuring a small footprint and high dewatering efficiency.

[0031] As an optional implementation, the electric field pretreatment structure 4 includes a cylindrical insulated electrode 2, a metal tube 5, and an electrode support 14. The cylindrical insulated electrode 2 is fixed inside the metal tube 5 by the electrode support 14, which supports the cylindrical insulated electrode 2 so that the central axes of the cylindrical insulated electrode 2 and the metal tube 5 coincide. There are at least two electrode supports 14. One end of the cylindrical insulated electrode 2 is connected to the positive terminal of the high-voltage power supply, and the metal tube 5 is connected to the negative terminal of the high-voltage power supply. A pretreatment channel exists between the cylindrical insulated electrode 2 and the metal tube 5, generating a high-frequency high-voltage AC electric field, i.e., a non-uniform high-frequency high-voltage AC electric field. The high-voltage power supply can be a high-frequency high-voltage pulse AC power supply with a voltage of 0-30kV, a frequency of 50-5000Hz, a duty cycle of 0-30%, and a square wave waveform. The optimal frequency, voltage, and duty cycle need to be selected based on the specific physicochemical properties of the sludge.

[0032] As an optional implementation, the electric field pretreatment structure 4 also includes an inlet pipe 1, an insulating bend 3, and a tangential pipe 6. The insulating bend 3 is a curved structure made of insulating materials such as polytetrafluoroethylene. The inlet pipe 1, the insulating bend 3, the metal round pipe 5, and the tangential pipe 6 are connected sequentially by flanges for easy assembly and disassembly. The lengths of the cylindrical insulating electrode 2 and the metal round pipe 5 can be changed according to the actual sludge treatment volume on site, thus changing the range of the high-frequency high-voltage AC electric field. One end of the cylindrical insulating electrode 2 extends through the side wall of the insulating bend 3 and is connected to the positive terminal of the high-voltage power supply. The tangential pipe 6 is connected to the lower part of the vertical tank and is tangential to the side wall of the vertical tank. The sludge pretreated by the high-frequency high-voltage AC electric field will enter the vertical tank through the tangential pipe 6 in a swirling manner. The inlet pipe 1 is connected to the sludge tank through a pipe and a pump body, thereby allowing the sludge in the sludge tank to be transported into the inlet pipe 1.

[0033] As an optional embodiment, a first insulating layer is provided on the outer surface of the cylindrical insulating electrode 2. The thickness of the first insulating layer is 0.5 to 1.5 mm. The first insulating layer has good insulation and sealing properties by spraying aluminum oxide on the outer surface of the cylindrical insulating electrode 2 or by casting epoxy resin onto the outer surface of the cylindrical insulating electrode 2.

[0034] As an optional implementation, the electric field vortex dehydration structure 7 includes a spatial electrode assembly 8, a vortex breaker 9, and a water-blocking weir plate 10. The spatial electrode assembly 8, the vortex breaker 9, and the water-blocking weir plate 10 are installed sequentially from bottom to top inside the vertical tank. The spatial electrode assembly 8 is electrically connected to a high-voltage power supply.

[0035] As an optional implementation, the space electrode assembly 8 includes a connecting cylinder 19, a metal helical blade 16, an insulating helical blade 17, and a fixing bracket 15. The metal helical blade 16 is fixedly wound around the outer wall of the connecting cylinder 19 in a helical direction, and the insulating helical blade 17 is fixedly wound around the outer wall of the connecting cylinder 19 in a helical direction. There are multiple metal helical blades 16 and insulating helical blades 17, which are spaced apart. The insulating helical blade 17 is connected to the positive terminal of the high-voltage power supply, and the metal helical blade 16 is connected to the negative terminal of the high-voltage power supply. The outer wall of the connecting cylinder 19 is connected to the inner wall of the vertical tank through the fixing bracket 15. The fixing bracket 15 can be multiple strip plates, all of which are distributed along the circumferential direction of the connecting cylinder 19. The two ends of the strip plates are fixedly connected to the outer wall of the connecting cylinder 19 and the inner wall of the vertical tank, respectively. Sludge enters the spatial electrode assembly 8 through the tangential pipe 6, forming a strong vortex. It flows upwards along the wall of the spiral blades (i.e., metal spiral blades 16 or insulated spiral blades 17). Under centrifugal force, the denser sludge particles move to the upper surface of the spiral blades and fall down to the bottom of the vertical tank, then are discharged through the sludge discharge pipe 13. The less dense aqueous phase moves to the lower surface of the spiral blades, moves up along the lower surface to the upper space of the vertical tank, passes through the fixed support 15, and enters the vortex breaker 9. In the flow channel formed by multiple spiral blades, the principle of shallow sedimentation accelerates the separation of sludge and aqueous phase. Simultaneously, a non-uniform high-frequency high-voltage alternating electric field is formed between adjacent metal spiral blades 16 and insulated spiral blades 17. Dipole coalescence and dielectric electrophoretic coalescence further remove bound water from the sludge. That is, by utilizing the synergistic effect of electric field-vortex and shallow sedimentation, deep, rapid, and efficient dewatering of sludge is achieved. Multiple through holes can be provided on the circumferential sidewall of the connecting cylinder 19.

[0036] As an optional implementation, a second insulating layer is provided on the outer surface of the insulating spiral blade 17. The thickness of the second insulating layer is 2-4 mm. The second insulating layer is formed by spraying aluminum oxide onto the outer surface of the insulating spiral blade 17 or by casting epoxy resin onto the outer surface of the insulating spiral blade 17. The metal spiral blade 16 is manufactured using 3D printing technology.

[0037] As an optional implementation, the vortex-breaking component 9 includes a fixed cylinder 20 and vortex-breaking blades 18. Multiple vortex-breaking blades 18 are distributed along the circumferential direction of the fixed cylinder 20, with both ends of each blade connected to the outer wall of the fixed cylinder 20 and the inner wall of the vertical tank, respectively. The sludge passes through the spatial electrode assembly 8, and the separated aqueous phase enters the vortex-breaking component 9. Under the action of the vortex-breaking blades 18, the fluid that has passed through the spiral blades and generated vortices is broken and stabilized, allowing the aqueous phase to flow smoothly upwards through the vortex-breaking component 9 and into the weir plate 10.

[0038] As an optional implementation, a sludge discharge pipe 13 is provided at the bottom of the vertical tank, and the dewatered sludge is discharged from the sludge discharge pipe 13 at the bottom of the vertical tank. An exhaust pipe 11 is provided at the top of the vertical tank, and a water outlet pipe 12 is provided on the upper side wall of the vertical tank.

[0039] The weir plate 10 includes an overflow cylinder and an annular plate. The lower end of the overflow cylinder is connected to the inner wall of the vertical tank via the annular plate. The height of the annular plate is lower than the bottom height of the water outlet pipe 12, and the height of the upper end of the overflow cylinder is higher than the top height of the water outlet pipe 12. The water phase passing through the vortex breaking structure 9 enters the overflow cylinder, then overflows from the lower end of the overflow cylinder, enters the outside of the overflow cylinder, and is discharged from the water outlet pipe 12. A small amount of gas generated during the sludge thickening and dewatering process is discharged through the exhaust pipe 11 at the top of the vertical tank.

[0040] The working principle of this invention is as follows: Sludge enters from the inlet pipe 1 and is first pretreated by a non-uniform high-frequency high-voltage alternating electric field generated between the cylindrical insulating electrode 2 and the metal circular tube 5. This pretreatment breaks down the cell wall structure inside the sludge particles, releasing the bound water inside and improving the sludge's fluidity. Then, it passes through the tangential tube 6 to form a swirling flow and enters the spatial electrode assembly 8. Under the action of a non-uniform high-frequency high-voltage alternating electric field formed between the adjacent metal spiral blades 16 and the insulating spiral blades 17, the small-diameter bound water in the sludge aggregates into large water droplets, resulting in deep dewatering. Meanwhile, under the action of centrifugal force, the density difference causes the heavier sludge to move to the upper surface of the spiral blades and settle downwards along that surface, while the lighter water phase moves to the lower surface of the spiral blades and moves upwards along that surface. After passing through the vortex-breaking blades 18 for vortex breaking and flow stabilization, it finally overflows through the weir plate 10 to the water outlet pipe 12 and flows out. A small amount of gas generated during this process is discharged with the exhaust pipe 11. The dewatered sludge settles to the bottom of the vertical tank and is discharged through the sludge discharge pipe 13, thus realizing the sludge concentration and dewatering process.

[0041] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A sludge thickening and dewatering device based on the synergistic effect of an electric field and a swirling flow field, characterized in that, It includes a vertical tank, an electric field pretreatment structure (4), an electric field cyclone dehydration structure (7), and a high-voltage power supply, among which, The electric field pretreatment structure (4) is located on the outside of the vertical tank. The outlet of the electric field pretreatment structure (4) is connected to the vertical tank and the electric field pretreatment structure (4) is tangent to the side wall of the vertical tank. The electric field vortex dehydration structure (7) is installed inside the vertical tank. Both the electric field pretreatment structure (4) and the electric field vortex dehydration structure (7) are electrically connected to the high voltage power supply. The sludge is first pretreated by the high-frequency high-voltage AC electric field generated by the electric field pretreatment structure (4), and then enters the vertical tank in a swirling manner. The high-frequency high-voltage AC electric field generated by the electric field swirling dewatering structure (7) performs secondary treatment on the sludge entering the vertical tank. The electric field pretreatment structure (4) includes a cylindrical insulating electrode (2), a metal tube (5), and an electrode support (14). The cylindrical insulating electrode (2) is fixed inside the metal tube (5) by the electrode support (14). The central axes of the cylindrical insulating electrode (2) and the metal tube (5) coincide. One end of the cylindrical insulating electrode (2) is connected to the positive terminal of the high-voltage power supply, and the metal tube (5) is connected to the negative terminal of the high-voltage power supply. There is a pretreatment channel between the cylindrical insulating electrode (2) and the metal tube (5), and a high-frequency high-voltage AC electric field is generated in the pretreatment channel. The electric field vortex dehydration structure (7) includes a spatial electrode assembly (8), a vortex breaker (9), and a water-blocking weir plate (10). The spatial electrode assembly (8), the vortex breaker (9), and the water-blocking weir plate (10) are installed in the vertical tank from bottom to top. The spatial electrode assembly (8) is electrically connected to the high-voltage power supply. The space electrode assembly (8) includes a connecting cylinder (19), a metal spiral blade (16), an insulating spiral blade (17), and a fixed bracket (15). The metal spiral blade (16) is fixedly wound around the outer wall of the connecting cylinder (19) in a spiral direction, and the insulating spiral blade (17) is fixedly wound around the outer wall of the connecting cylinder (19) in a spiral direction. There are multiple metal spiral blades (16) and insulating spiral blades (17). The metal spiral blades (16) and insulating spiral blades (17) are spaced apart. The insulating spiral blade (17) is connected to the positive terminal of the high-voltage power supply, and the metal spiral blade (16) is connected to the negative terminal of the high-voltage power supply. The outer wall of the connecting cylinder (19) is connected to the inner wall of the vertical tank through the fixed bracket (15).

2. The sludge thickening and dewatering equipment based on the synergistic effect of electric field and swirling field according to claim 1, characterized in that, The electric field pretreatment structure (4) also includes an inlet pipe (1), an insulating bend (3), and a tangential pipe (6). The inlet pipe (1), the insulating bend (3), the metal round pipe (5), and the tangential pipe (6) are connected in sequence by flanges. One end of the cylindrical insulating electrode (2) passes through the side wall of the insulating bend (3) and is connected to the positive terminal of the high-voltage power supply. The tangential pipe (6) is connected to the lower part of the vertical tank and is tangential to the side wall of the vertical tank.

3. The sludge thickening and dewatering equipment based on the synergistic effect of electric field and swirling field according to claim 1, characterized in that, The outer surface of the cylindrical insulating electrode (2) is provided with a first insulating layer, the thickness of which is 0.5 to 1.5 mm.

4. The sludge thickening and dewatering equipment based on the synergistic effect of electric field and swirling field according to claim 3, characterized in that, The first insulating layer is formed by spraying aluminum oxide onto the outer surface of the cylindrical insulating electrode (2) or by casting epoxy resin onto the outer surface of the cylindrical insulating electrode (2).

5. The sludge thickening and dewatering equipment based on the synergistic effect of electric field and swirling field according to claim 1, characterized in that, The outer surface of the insulating spiral blade (17) is provided with a second insulating layer, the thickness of which is 2-4 mm.

6. The sludge thickening and dewatering equipment based on the synergistic effect of electric field and swirling flow field according to claim 1, characterized in that, The vortex-breaking component (9) includes a fixed cylinder (20) and vortex-breaking blades (18). There are multiple vortex-breaking blades (18), and all the vortex-breaking blades (18) are distributed along the circumferential direction of the fixed cylinder (20). The two ends of the vortex-breaking blades (18) are respectively connected to the outer wall of the fixed cylinder (20) and the inner wall of the vertical tank.

7. The sludge thickening and dewatering equipment based on the synergistic effect of electric field and swirling field according to claim 1, characterized in that, The bottom of the vertical tank is provided with a sludge discharge pipe (13), the top of the vertical tank is provided with an exhaust pipe (11), and the upper side wall of the vertical tank is provided with a water outlet pipe (12). The weir plate (10) includes an overflow cylinder and an annular plate. The lower end of the overflow cylinder is connected to the inner wall of the vertical tank through the annular plate. The height of the annular plate is lower than the bottom height of the water outlet pipe (12), and the height of the upper end of the overflow cylinder is higher than the top height of the water outlet pipe (12).

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