A device for treating production wastewater of a paper mill

Abstract

The application discloses a paper mill production wastewater treatment device, and belongs to the wastewater composite treatment field, which comprises a treatment part; the treatment part comprises a cylindrical section, a liquid inlet tangentially arranged on the cylindrical section and communicated with an inner chamber of the cylindrical section, an overflow pipe fixed on the upper end of the cylindrical section and extending into the inner chamber of the cylindrical section, a conical section integrally formed with the lower end of the cylindrical section, and a discharge port arranged on the lower end of the conical section; the application further comprises a premixing part fixed on one side of the outer wall of the cylindrical section and communicated with the liquid inlet; when the paper mill wastewater enters the premixing part, the negative pressure generated by the high-speed fluid is used to suck the magnetic seeds and coagulants in the feeding port; the violent turbulence in the premixing part can make the magnetic seeds, coagulants, fine fibers and fillers in the wastewater fully contact in a very short time, form a "micro-flocculation body" with the magnetic seeds as the core, supplement the flocculants in the shear zone, and can "wrap" and "repair" the primary flocculation body, so that the breaking effect caused by the feeding impact is offset.

Description

Technical Field

[0001] This invention relates to the field of wastewater composite treatment, and more specifically, to a wastewater treatment device for paper mill workshops. Background Technology

[0002] The papermaking industry generates a large amount of wastewater during production. Papermaking wastewater has a complex composition, containing a large amount of fine fibers, lignin, fillers (such as kaolin and calcium carbonate), and various chemical additives. It is characterized by high suspended solids (SS) concentration and high color.

[0003] Currently, the front-end treatment of wastewater from paper mills often employs cyclone separation in combination with other processes (such as air flotation and screens). However, in practical applications, existing paper mill wastewater treatment devices still face the following technical bottlenecks: The density difference between the fine fibers, fillers, and nascent flocs in papermaking wastewater and water is extremely small, resulting in weak radial centrifugal force on the particles, making it difficult for them to adhere to the container wall. At the same time, the enhanced swirling field, designed to increase throughput, generates severe shear stress, causing the loosely structured nascent flocs to easily break down during high-speed rotation, reverting to more difficult-to-separate particles and escaping through the overflow pipe with the central upward flow. This severely affects the wastewater purification effect and treatment rate. Summary of the Invention

[0004] In view of the problems existing in the prior art, the purpose of this invention is to provide a wastewater treatment device for papermaking workshops.

[0005] To solve the above problems, the present invention adopts the following technical solution.

[0006] A wastewater treatment device for a paper mill workshop includes a treatment section; The processing unit includes a cylindrical section, an inlet tangentially formed in the cylindrical section and connected to the internal cavity of the cylindrical section, an overflow pipe fixed to the upper end of the cylindrical section and extending into the internal cavity of the cylindrical section, a conical section integrally formed with the lower end of the cylindrical section, and a discharge port formed at the lower end of the conical section. It also includes a premixing section fixed to one side of the outer wall of the cylindrical section and connected to the liquid inlet, a feed inlet on the outer wall of the premixing section for adding magnetic seeds and coagulants to the liquid in the premixing section, tangential input ports on the inner walls of the cylindrical section and the conical section, a first feed pipe fixed to the outer wall of the cylindrical section and connected to one of the tangential input ports, and a second feed pipe fixed to the outer wall of the conical section and connected to the other tangential input port.

[0007] Furthermore, the inner wall of the conical section is integrally formed with a helical flange.

[0008] Furthermore, the first and second feed pipes are used to input flocculants. The flocculants enter the cylindrical and conical sections tangentially through two tangential input ports and combine with micro-flocculents with magnetic seeds as the core.

[0009] Furthermore, it also includes multiple magnetic field processing components located outside the conical section and arranged in a gradient, and the magnetic field processing components include a bracket fixed to the outer wall of the conical section, an electromagnetic induction coil fixed outside the bracket, and a heat insulation layer located between the electromagnetic induction coil and the outer wall of the conical section.

[0010] Furthermore, the heat insulation layer is a hollow structure or a heat insulation pad, and the bracket is a non-magnetic heat insulation bracket.

[0011] Furthermore, it also includes a pre-magnetization treatment component, which includes a non-magnetic tube body with one end fixed to the premixing part and the other end fixed to one side of the outer wall of the cylindrical section, two sets of magnetic cores fixed to the outer wall of the non-magnetic tube body, and an electromagnetic coil fixedly sleeved outside the non-magnetic tube body and located outside the two sets of magnetic cores.

[0012] Furthermore, the outer wall of the non-magnetic tube body is provided with two sets of mounting grooves, and the two sets of magnetic cores are respectively fixed in the two sets of mounting grooves. The magnetic cores are triangular or trapezoidal teeth, and the tips of the magnetic cores face the center of the non-magnetic tube body.

[0013] Furthermore, a housing is fixed to the outside of the non-magnetic tube body, and the housing covers the outside of the electromagnetic coil.

[0014] Furthermore, the processing unit is also equipped with a flow stabilizing assembly, which includes a flow stabilizing cone located above the junction of the lower part of the cone section and the discharge port, a first radial support plate connecting the outer wall of the flow stabilizing cone to the inner wall of the cone section, and a flow stabilizing pipe that passes through the flow stabilizing cone and is fixed inside the flow stabilizing cone. The upper end of the flow stabilizing pipe extends into the overflow pipe and the central axis of the flow stabilizing pipe coincides with the central axis of the cylindrical section. A second radial support plate is fixed to the outer wall of one end of the flow stabilizing pipe that enters the overflow pipe, and the other end of the second radial support plate is connected to the inner wall of the overflow pipe. The lower end of the flow stabilizing pipe is flush with the bottom of the flow stabilizing cone, and the inside of the flow stabilizing pipe is hollow.

[0015] Furthermore, a third feed pipe is fixed to the outer wall of the flow stabilizing pipe. The flow stabilizing pipe, the third feed pipe, the second radial support plate, and the overflow pipe are all provided with internal flow channels. The overflow pipe has a feed interface on its outer wall that communicates with the internal flow channels.

[0016] Compared with the prior art, the beneficial effects of the present invention are as follows: (1) Since papermaking wastewater contains a large number of fine fibers, conventional cyclone flow can easily break them up. This invention overcomes the technical prejudice that papermaking wastewater fiber flocs are easily broken by making the cohesive force of the micro-flocs greater than the shear force of the cyclone flow. When the papermaking wastewater enters the premixing section, the magnetic seed and coagulant in the feed inlet are drawn in by the negative pressure generated by the high-speed fluid. The violent turbulence in the premixing section can make the magnetic seed, coagulant and fine fibers and fillers in the wastewater come into full contact in a very short time, forming a "micro-floc" with the magnetic seed as the core. After the magnetic seed is added, the overall density of the composite flocs formed is greatly increased, which allows the fine suspended matter that is originally difficult to settle to quickly move towards the wall of the container and enter the discharge port. Meanwhile, a tangential inlet is set in the cylindrical section, and flocculant is added in the shear zone to "wrap" and "repair" the nascent flocs, offsetting the crushing effect caused by the impact of the feed. Flocculant is sprayed again in the conical section, which is equivalent to adding a layer of "reinforcing ribs" to the already formed flocs, ensuring that the flocs not only do not break during high-speed rotation, but also become denser through "collision-coagulation". The wastewater enters in a "micro-flocculated" state and "grows while rotating" during the swirling process. This mode makes the flow field more stable and reduces the chance of solid particles escaping directly from the overflow pipe. The speed of swirling treatment is much faster than gravity settling, which can cope with the large fluctuations in wastewater flow in paper mills.

[0017] (2) This scheme is equipped with a magnetic field treatment component. The magnetic field is designed to be a gradient distribution that gradually increases from top to bottom. In this way, the magnetic seeds are subjected to not only radial outward force, but also axial downward force, which induces the magnetic seeds to spiral down towards the discharge port. In addition, the magnetic field can also forcefully "pull" the flocs containing magnetic seeds to the outward swirling area, which greatly reduces the turbidity of the overflow water. During the downward flow of the flocs, the binding force they are subjected to becomes stronger and stronger, which produces a "squeezing" effect, causing the magnetic flocs to further aggregate into clusters at the bottom of the cone. Before being discharged, they are compressed by magnetic force against the cone wall, which significantly increases the solid content of the sludge discharged from the grit outlet and reduces the treatment burden of subsequent sludge dewatering. At the same time, the annular electromagnetic field not only provides pulling force, but also causes the magnetic seeds in it to be oriented along the direction of the magnetic field lines, forming a "chain structure". This magnetic chain structure acts as the "skeleton" of the flocs, which enhances the structural strength of the flocs from the inside, so that they not only do not break in the strong shear field, but can also capture more fine particles through magnetic attraction.

[0018] (3) This scheme is equipped with a pre-magnetization treatment component. When the micro flocs in the premixing section enter the treatment section through the pre-magnetization treatment component, the magnetic seeds will be instantaneously magnetized when passing through the magnetic field generated by the electromagnetic coil. When the magnetic seeds leave the pre-magnetization area and enter the treatment section, although the external magnetic field disappears, the magnetic seeds retain residual magnetism. The magnetic seeds with residual magnetism will generate dipoles that attract each other, forming tiny "magnetic chains" or "magnetic clusters". This "cohesive force" provided by magnetic force is more stable than the van der Waals force provided by flocculant alone, so that the flocs after entering the treatment section have initial structural strength. Pre-magnetization makes the magnetic seeds oriented. In the strong shear field of the subsequent entry into the treatment section, this will enhance the shear modulus of the flocs. In the high-speed turbulence of the treatment section, the breakage rate of the pre-magnetized flocs will be significantly reduced, ensuring the integrity of the subsequent centrifugal separation. At the same time, the pre-magnetized flocs are usually more compact and round than the flocs formed by natural flocculation. The more compact particles have a smaller drag coefficient in the swirling field and a faster centrifugal settling speed.

[0019] (4) This scheme is equipped with a flow stabilizing component. The flow stabilizing cone is like an "umbrella" that blocks the area directly above the discharge port, changes the direction of flow field convergence, and forces the starting point of the inner swirling flow to move upward. This prevents the magnetic flocs that have settled to the bottom of the cone by centrifugal force and magnetic force from being forcibly "absorbed" back by the central negative pressure and carried to the overflow pipe, thus reducing the turbidity of the overflow water. The flow stabilizing pipe forcibly fixes the path of the central streamline, providing a dedicated channel for the central air column or the lightest fluid, so that the downward swirling flow of the outer layer and the upward flow of the inner layer do not interfere with each other, and changes the swirling flow field from "turbulent rotation" to "stable axis rotation". Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram of the structure of the first feed pipe and the second feed pipe of the present invention; Figure 3 This is a cross-sectional view of the cone section and the current stabilizing component of the present invention; Figure 4 For the present invention Figure 4 Enlarged schematic diagram of the structure at point A in the middle; Figure 5 This is a schematic diagram of the current stabilization component structure of the present invention; Figure 6 For the present invention Figure 3 Enlarged schematic diagram of the structure at point B; Figure 7 This is a cross-sectional view of the premixing section and premagnetization treatment assembly of the present invention; Figure 8 This is a schematic diagram of the mounting groove and magnetic core structure of the present invention.

[0021] Explanation of the labels in the diagram: 1. Processing section; 11. Liquid inlet; 12. Overflow pipe; 13. Cylindrical section; 14. Conical section; 15. Discharge port; 16. Spiral flange; 17. Tangential input port; 2. Premixing section; 21. Feed inlet; 3. First feed pipe; 4. Second feed pipe; 5. Magnetic field processing assembly; 51. Support; 52. Electromagnetic induction coil; 53. Heat insulation layer; 6. Flow stabilizing assembly; 61. Flow stabilizing cone; 62. Flow stabilizing pipe; 63. First radial support plate; 64. Second radial support plate; 7. Pre-magnetization processing assembly; 71. Non-magnetic tube body; 72. Electromagnetic coil; 73. Housing; 74. Mounting groove; 75. Magnetic core; 8. Third feed pipe; 81. Inner flow channel; 82. Feed interface. Detailed Implementation

[0022] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0023] Please see Figures 1 to 8 A wastewater treatment device for a paper mill workshop includes a treatment unit 1; The processing unit 1 includes a cylindrical section 13, an inlet 11 tangentially formed in the cylindrical section 13 and connected to the internal cavity of the cylindrical section 13, an overflow pipe 12 fixed to the upper end of the cylindrical section 13 and extending into the internal cavity of the cylindrical section 13, a conical section 14 integrally formed with the lower end of the cylindrical section 13, and a discharge port 15 formed at the lower end of the conical section 14. It also includes a premixing section 2 fixed to one side of the outer wall of the cylindrical section 13 and connected to the liquid inlet 11; a feed inlet 21 opened on the outer wall of the premixing section 2 for adding magnetic seeds and coagulants to the liquid in the premixing section 2; a tangential input port 17 opened on the inner wall of the cylindrical section 13 and the inner wall of the conical section 14; a first feed pipe 3 fixed to the outer wall of the cylindrical section 13 and connected to one of the tangential input ports 17; and a second feed pipe 4 fixed to the outer wall of the conical section 14 and connected to the other tangential input port 17.

[0024] The inner wall of the conical section 14 is also integrally formed with a spiral flange 16.

[0025] The first feed pipe 3 and the second feed pipe 4 are used to input flocculant. The flocculant enters the cylindrical section 13 and the conical section 14 tangentially through two tangential input ports 17 and combines with the micro-flocs with magnetic seeds as the core.

[0026] By adopting the above technical solution, wastewater enters the inlet 11 through the premixing section 2. The premixing section 2 is a venturi tube, and the inlet 21 is connected to the throat. When the wastewater passes through the premixing section 2, the flow rate in the throat increases. At the same time, the inlet 21 is connected to a pipe for supplying premixing agent (composed of magnetic seed and coagulant). When papermaking wastewater enters the premixing section 2, the negative pressure generated by the high-speed fluid draws in the premixing agent in the inlet 21. The violent turbulence in the premixing section can make the magnetic seed, coagulant and fine fibers and fillers in the wastewater come into full contact in a very short time, forming micro-flocs with the magnetic seed as the core. The micro-flocs enter the cylindrical section 13 with the liquid from the inlet 11 and form a vortex in the cylindrical section 13. After the magnetic seed is added, the overall density of the composite flocs is greatly increased, so that the fine suspended matter that is originally difficult to settle can quickly move towards the inner wall of the cylindrical section 13 and the conical section 14 and be discharged from the discharge port 15. Tangential inlets 17 are provided on the inner walls of both the cylindrical section 13 and the conical section 14. The tangential inlets 17 are inclinedly located on the inner walls of the cylindrical section 13 and the conical section 14. Both the first feed pipe 3 and the second feed pipe 4 are externally connected to pipes supplying flocculant. When wastewater and micro-flocculents enter the cylindrical section 13, the flocculant in the first feed pipe 3 is discharged into the cylindrical section 13 through one of the tangential inlets 17, replenishing the shear zone within the cylindrical section 13 with flocculant. This allows for the "wrapping" and "repairing" of the nascent flocculents, counteracting the crushing effect caused by the impact of the feed. When micro-flocculents enter... When entering the cone section 14, the flocculant in the second feed pipe 4 is discharged into the cone section 14 through another tangential inlet 17, which is equivalent to adding another layer of "reinforcing ribs" to the already formed flocs, ensuring that the flocs not only do not break during high-speed rotation, but also become denser through "collision-coagulation"; allowing the wastewater to enter in a "micro-flocculated" state, "growing while rotating" during the swirling process. This mode makes the flow field more stable, reduces the chance of solid particles escaping directly from the overflow pipe 12, and the speed of swirling treatment is much faster than gravity settling, which can cope with the large fluctuations in wastewater flow in paper mills; Force analysis: The specific gravity of flocs (fibers, lignin, fillers) in ordinary papermaking wastewater is typically around 1.02-1.05, with a very small density difference from water. According to the centrifugal force formula: It is the formula for centrifugal force in circular motion in classical mechanics; Centrifugal force, measured in Newtons (N); in the processing section, it represents the inertial force that causes particles to move away from the center and towards the container wall. The mass of the particles is expressed in kilograms. Tangential velocity, measured in meters per second, refers to the linear velocity of a particle as it rotates with the fluid. The radius of rotation, measured in meters, refers to the distance from the particle to the central axis of the processing unit.

[0027] The unfolding form in a fluid environment is In treating papermaking wastewater, the particles are submerged in water. At this time, the particles are subjected not only to outward centrifugal force but also to inward centripetal buoyancy from the liquid. Therefore, the effective mass determines the separation efficiency.

[0028] This refers to the density of solid particles (or flocs); The density of the liquid (in this application, it refers to the density of papermaking wastewater); The density difference is the key to separation; if The particles are heavier than water, so they are thrown outwards and discharged from the bottom outlet. if Particles that are lighter than water, such as certain oils, tend to aggregate inwards and are discharged from the overflow outlet. if When the centrifugal force is zero, the particles will remain suspended in the water and cannot be separated by rotation. Increase The original flocs (fibers, lignin) in papermaking wastewater have a density very close to that of water, and the density difference is also relatively close. When magnetic powder is introduced as a magnetic seed to form composite flocs, the overall density will increase significantly, the density difference will become higher, and the centrifugal force will double. Increase By spraying flocculants, small micro-magnetic flocs aggregate into larger flocs, increasing their volume. According to the formula, centrifugal force is proportional to volume, further enhancing the separation effect.

[0029] like Figure 3 and Figure 4 As shown, it also includes a plurality of magnetic field processing components 5 located outside the conical section 14 and arranged in a gradient, and the magnetic field processing components 5 include a bracket 51 fixed on the outer wall of the conical section 14, an electromagnetic induction coil 52 fixed outside the bracket 51, and a heat insulation layer 53 located between the electromagnetic induction coil 52 and the outer wall of the conical section 14.

[0030] The heat insulation layer 53 is a hollow structure or a heat insulation pad, and the bracket 51 is a non-magnetic heat insulation bracket 51.

[0031] By employing the above technical solution, a high-frequency pulsed current is supplied to the electromagnetic induction coil 52, and the magnetic force acts intermittently like a "vibrator," causing the magnetic seeds to be continuously carried downstream by the mainstream fluid during their migration towards the wall, preventing them from clumping together. Simultaneously, the magnetic field treatment component 5 is designed with a gradient distribution that gradually increases from top to bottom. This ensures that the magnetic seeds experience not only a radially outward component but also an axially downward component, inducing them to spiral down towards the discharge port 15. Furthermore, the magnetic field can forcibly "pull" the flocs containing the magnetic seeds towards the outward swirling area, significantly reducing the turbidity of the overflow water. The flocs, as they migrate towards the wall... During the download process, the binding force becomes stronger and stronger, which produces a "squeezing" effect, causing the magnetic flocs to further aggregate into clumps at the bottom of the cone. Before being discharged, they are compressed against the cone wall by magnetic force, which significantly increases the solids content of the sludge discharged from the grit outlet and reduces the processing burden of subsequent sludge dewatering. At the same time, the annular electromagnetic field not only provides tension, but also causes the magnetic seeds in it to align in the direction of the magnetic field lines, forming a "chain structure". This magnetic chain structure acts as the "skeleton" of the flocs, enhancing the structural strength of the flocs from the inside. This allows them not to break in a strong shear field, but to capture more fine particles through magnetic attraction. In practical applications, the axial / tangential fluid shear force must be greater than the frictional force between the magnetic seed and the wall surface, i.e. ; in, For fluid drag, it is the "thrust" or "shear force" generated on magnetic seed particles when the fluid (wastewater) flows tangentially or axially. It is the force that makes the particles move downward to the settling outlet, and the unit is Newton. Centrifugal force is the force generated by particles rotating at high speed with a swirling current, directed radially outward (towards the inner wall), and its unit is Newton. It is magnetic attraction, the radial outward (towards the inner wall) attraction generated by an external magnetic field on a magnetic seed, and its unit is Newton; The coefficient of friction is the frictional characteristic between the magnetic seed particles and the inner wall material of the processing section. The smaller the value, the smoother the inner wall.

[0032] In this application, a high-frequency pulsed current is supplied to the electromagnetic induction coil 52 instead of a constant direct current or a permanent magnet; and the operating time of the electromagnetic induction coil 52 can be set to a cycle (e.g., 1 minute of operation followed by 2 seconds of magnetic field disappearance). At the instant the magnetic field disappears, the flow rate discharged from the discharge port 15 will increase instantaneously, carrying away the heavy components accumulated on the wall surface; a zoned control method can also be used, for example, a weak magnetic field is arranged above the conical section 14 to induce aggregation, and a strong magnetic field is arranged below to accelerate final compaction.

[0033] like Figure 1 , Figure 7 and Figure 8As shown, it also includes a pre-magnetization treatment component 7, which includes a non-magnetic tube 71 with one end fixed to the premixing section 2 and the other end fixed to one side of the outer wall of the cylindrical section 13; two sets of magnetic cores 75 fixed to the outer wall of the non-magnetic tube 71 (magnetic cores 75 are arranged on two radially opposite sides of the non-magnetic tube 71. For example, the left side is an N-pole tooth array and the right side is an S-pole tooth array. In this way, the magnetic field lines will cross the pipeline, forcing the magnetic flux to grow laterally, increasing the probability of intercepting small pollutants in the wastewater); and an electromagnetic coil 72 fixedly sleeved outside the non-magnetic tube 71 and located outside the two sets of magnetic cores 75.

[0034] The outer wall of the non-magnetic tube 71 is provided with two sets of mounting grooves 74, and two sets of magnetic cores 75 are respectively fixed in the two sets of mounting grooves 74. The magnetic cores 75 are triangular or trapezoidal teeth (the tips should not be too blunt. Using triangular or trapezoidal cross-section teeth can produce a more significant tip effect. The material can be electrical pure iron or silicon steel sheets stacked to reduce hysteresis loss and obtain higher saturation magnetic induction intensity), and the tips of the magnetic cores 75 face the core of the non-magnetic tube 71.

[0035] The non-magnetic tube body 71 is further fixed with a housing 73, and the housing 73 covers the outside of the electromagnetic coil 72.

[0036] By adopting the above technical solution, when the micro-flocculents in the premixing section 2 enter the processing section 1 through the non-magnetic tube 71 (the material can be stainless steel, PVC or fiberglass), the magnetic seeds will be instantaneously magnetized when they pass through the magnetic field generated by the electromagnetic coil 72 (which generates a constant magnetic field through direct current and the intensity is adjustable. By controlling the current, the magnetic field intensity is just enough to make the magnetic seeds "chain" and gather towards the center of the tube, but not to produce a strong adsorption that cannot be washed away by the fluid; a pulse current can also be designed to periodically "shake off" the trace magnetic powder that may adhere to the wall surface). A simple electromagnetic coil 72 produces a relatively uniform magnetic field in its central region. According to the magnetic force formula (Kelvin force formula): ,in The magnetic force, measured in Newtons, is the vector of the resultant force acting on the magnetic particles. In the scheme of this application, the direction of this force determines whether the particles can overcome the centripetal force or turbulence and successfully migrate towards the container wall. Ω is the magnetic dipole moment, measured in amperes per square meter. It is a physical quantity that describes the degree to which a particle is "magnetized." The larger the particle volume and the better its magnetization, the greater the magnetic force it experiences. In mathematics, the gradient operator represents the rate of change of a spatial location if the magnetic field is constant everywhere. =0), then even if the magnetic field is strong, the particles will only rotate and will not translate. Magnetic flux density is a physical quantity that describes the strength of a magnetic field in space. This represents the magnetic field gradient. If the magnetic field is uniform (gradient is 0), the magnetic seed will only be magnetized (generating a magnetic dipole moment). The magnetic field lines are oriented and arranged in a chain, but are not subject to a resultant force attracting them in a specific direction. This application introduces a magnetic core 75, through which magnetic field lines preferentially pass and highly concentrate at the "tip" or "corner" of the core 75. This intense bending and concentration of magnetic field lines creates an extremely high magnetic field gradient within the tube. When the magnetic seeds enter this high-gradient region, they not only connect end-to-end due to magnetization but also drift towards the "tip projection region" with even higher magnetic field strength, significantly accelerating the collision of the magnetic seeds and the formation of coarse flocs. When the magnetic seeds leave the pre-magnetization zone and enter the treatment section 1, although the external magnetic field disappears, the magnetic seeds retain residual magnetism. The magnetic seed particles with residual magnetism will generate dipoles that attract each other, forming tiny "magnetic chains" or "magnetic clusters". This "cohesive force" provided by magnetic force is more stable than the van der Waals force provided by flocculant alone, so that the flocs after entering the treatment section 1 have initial structural strength. Pre-magnetization causes the magnetic seeds to align in an orientation. In the strong shear field of the subsequent entry into the treatment section 1, this will enhance the shear modulus of the flocs. In the high-speed turbulence of the treatment section 1, the breakage rate of the pre-magnetized flocs will be significantly reduced, ensuring the integrity of the subsequent centrifugal separation. At the same time, the pre-magnetized flocs are usually more compact and rounded than the flocs formed by natural flocculation. The more compact particles experience a smaller drag coefficient in the swirling flow field and a faster centrifugal settling speed.

[0037] like Figure 3 , Figure 5 and Figure 6 As shown, the processing unit 1 is also equipped with a flow stabilizing component 6. The flow stabilizing component 6 includes a flow stabilizing cone 61 located above the junction of the lower part of the cone section 14 and the discharge port 15, a first radial support plate 63 connecting the outer wall of the flow stabilizing cone 61 to the inner wall of the cone section 14, and a flow stabilizing pipe 62 that passes through the flow stabilizing cone 61 and is fixed inside the flow stabilizing cone 61. The upper end of the flow stabilizing pipe 62 extends into the overflow pipe 12 and the central axis of the flow stabilizing pipe 62 coincides with the central axis of the cylindrical section 13. A second radial support plate 64 is fixed to the outer wall of one end of the flow stabilizing pipe 62 that enters the overflow pipe 12, and the other end of the second radial support plate 64 is connected to the inner wall of the overflow pipe 12. The lower end of the flow stabilizing pipe 62 is flush with the bottom of the flow stabilizing cone 61, and the inside of the flow stabilizing pipe 62 is hollow.

[0038] The outer wall of the flow stabilizing pipe 62 is fixedly connected to the third feed pipe 8. The inner flow channels 81 are opened in the interior of the flow stabilizing pipe 62, the third feed pipe 8, the second radial support plate 64 and the overflow pipe 12. The outer wall of the overflow pipe 12 is provided with a feed interface 82 that communicates with the inner flow channels 81.

[0039] By adopting the above technical solution, the inside of the flow stabilizer 62 is hollow, and the openings are respectively opened at the upper and lower ends of the flow stabilizer 62. When the processing unit 1 is working, due to the minimum centrifugal force at the center, an air core will be formed through the center due to negative pressure. Without the flow stabilizer 62, the air column would swing violently in the chamber like a jumping rope. This swinging might tear apart the flocs that have been painstakingly formed by the magnetic seeds and flocculants. The flow stabilizer 62 forcibly fixes the path of the central streamline, providing a dedicated channel for the central air column or the lightest fluid, so that the downward swirling flow of the outer layer and the upward flow of the inner layer do not interfere with each other, and the swirling field changes from "turbulent rotation" to "stable axis rotation". The inside of the flow stabilizer 62 draws upward, but the tube wall is closed, creating a relatively static "physical shadow zone" below the flow stabilizer cone 61. When the magnetic flocs settle, they do not sense the pull of the central upward flow and will slide along the cone wall towards the discharge port 15. The flow-stabilizing cone 61 acts like an "umbrella," blocking the area directly above the discharge port 15. This changes the direction of the flow field convergence, forcing the starting point of the internal swirling flow to move upward. It prevents the magnetic flocs that have settled to the bottom of the cone by centrifugal force and magnetic force from being forcibly "drawn" back by the central negative pressure and carried to the overflow pipe 12, thus reducing the turbidity of the overflow water.

[0040] Usage: Wastewater enters the inlet 11 through the premixing section 2. The inlet 21 is connected to the throat. When the wastewater passes through the premixing section 2, the flow rate in the throat increases. At the same time, the inlet 21 is connected to a pipe for supplying premixing agent (composed of magnetic seed and coagulant). When papermaking wastewater enters the premixing section 2, the negative pressure generated by the high-speed fluid draws the premixing agent into the inlet 21. The intense turbulence in the premixing section 2 allows the magnetic seed, coagulant, and fine fibers and fillers in the wastewater to come into full contact in a very short time, forming micro-flocs with the magnetic seed as the core. When the micro-flocs enter the treatment section 1 through the non-magnetic tube 71, the magnetic seed is instantaneously magnetized when passing through the magnetic field generated by the electromagnetic coil 72. When the magnetic seed leaves the pre-magnetized area and enters the treatment section 1, although the external magnetic field disappears, residual magnetism is retained inside the magnetic seed. The particles attract each other with dipoles, forming tiny "magnetic chains" or "magnetic clusters". The micro-flocs and magnetic seeds enter the cylindrical section 13 from the inlet 11 along with the liquid, and form a swirling flow in the cylindrical section 13. The flocculant in the first feed pipe 3 is discharged into the cylindrical section 13 through one of the tangential inlets 17, supplementing the shear zone in the cylindrical section 13 with flocculant. When the micro-flocs enter the conical section 14, the flocculant in the second feed pipe 4 is discharged into the conical section 14 through the other tangential inlet 17, so that the wastewater enters in a "micro-floc" state and "grows while rotating" during the swirling flow. After the addition of magnetic seeds, the overall density of the composite flocs is greatly increased, so that the originally difficult-to-settle fine suspended matter can quickly move towards the inner wall of the cylindrical section 13 and the conical section 14 and be discharged from the discharge port 15.

[0041] The above description is merely a preferred embodiment of the present invention; however, the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and its improved concepts, should be covered within the scope of protection of the present invention.

Claims

1. A wastewater treatment device for a paper mill workshop, comprising a treatment unit (1), characterized in that: The processing unit (1) includes a cylindrical section (13), an inlet (11) tangentially formed in the cylindrical section (13) and connected to the internal cavity of the cylindrical section (13), an overflow pipe (12) fixed to the upper end of the cylindrical section (13) and extending into the internal cavity of the cylindrical section (13), a conical section (14) integrally formed with the lower end of the cylindrical section (13), and a discharge port (15) formed at the lower end of the conical section (14). It also includes a premixing section (2) fixed to one side of the outer wall of the cylindrical section (13) and connected to the liquid inlet (11), a feed inlet (21) opened on the outer wall of the premixing section (2) for adding magnetic seeds and coagulants to the liquid in the premixing section (2), a tangential input port (17) opened on the inner wall of the cylindrical section (13) and the inner wall of the conical section (14), a first feed pipe (3) fixed to the outer wall of the cylindrical section (13) and connected to one of the tangential input ports (17), and a second feed pipe (4) fixed to the outer wall of the conical section (14) and connected to the other tangential input port (17).

2. The wastewater treatment device for a paper mill workshop according to claim 1, characterized in that: The inner wall of the conical segment (14) is also integrally formed with a spiral flange (16).

3. A wastewater treatment device for a paper mill workshop according to claim 1 or 2, characterized in that: The first feed pipe (3) and the second feed pipe (4) are configured to feed flocculant into the internal chamber of the processing unit (1). The flocculant enters the cylindrical section (13) and the conical section (14) tangentially through two tangential inlets (17) and combines with the micro-flocs with magnetic seeds as the core.

4. The wastewater treatment device for a paper mill workshop according to claim 1, characterized in that: It also includes multiple magnetic field processing components (5) located outside the cone section (14) and arranged in a gradient, and the magnetic field processing components (5) include a bracket (51) fixed on the outer wall of the cone section (14), an electromagnetic induction coil (52) fixed outside the bracket (51), and a heat insulation layer (53) located between the electromagnetic induction coil (52) and the outer wall of the cone section (14).

5. The wastewater treatment device for a paper mill workshop according to claim 4, characterized in that: The heat insulation layer (53) is a hollow structure or a heat insulation pad, and the bracket (51) is a non-magnetic heat insulation bracket (51).

6. The wastewater treatment device for a paper mill workshop according to claim 1, characterized in that: It also includes a pre-magnetization processing component (7), which includes a non-magnetic tube (71) with one end fixed to the premixing part (2) and the other end fixed to one side of the outer wall of the cylindrical section (13), two sets of magnetic cores (75) fixed on the outer wall of the non-magnetic tube (71), and an electromagnetic coil (72) fixedly sleeved outside the non-magnetic tube (71) and located outside the two sets of magnetic cores (75).

7. The wastewater treatment device for a paper mill workshop according to claim 6, characterized in that: The outer wall of the non-magnetic tube body (71) is provided with two sets of mounting grooves (74), and two sets of magnetic cores (75) are fixed in the two sets of mounting grooves (74) respectively. The magnetic cores (75) are triangular or trapezoidal teeth, and the tips of the magnetic cores (75) face the core of the non-magnetic tube body (71).

8. A wastewater treatment device for a paper mill workshop according to claim 6 or 7, characterized in that: The non-magnetic tube body (71) is also fixed with a shell (73), and the shell (73) covers the outside of the electromagnetic coil (72).

9. The wastewater treatment device for a paper mill workshop according to claim 1, characterized in that: The processing unit (1) is also equipped with a flow stabilizing assembly (6). The flow stabilizing assembly (6) includes a flow stabilizing cone (61) located above the junction of the lower part of the cone section (14) and the discharge port (15), a first radial support plate (63) connecting the outer wall of the flow stabilizing cone (61) to the inner wall of the cone section (14), and a flow stabilizing pipe (62) that penetrates the flow stabilizing cone (61) and is fixed inside the flow stabilizing cone (61). The upper end of the flow stabilizing pipe (62) extends into The central axis of the flow stabilizing pipe (62) is coincident with the central axis of the cylindrical section (13). The outer wall of one end of the flow stabilizing pipe (62) entering the overflow pipe (12) is fixed with a second radial support plate (64), and the other end of the second radial support plate (64) is connected to the inner wall of the overflow pipe (12). The lower end of the flow stabilizing pipe (62) is flush with the bottom of the flow stabilizing cone (61), and the inside of the flow stabilizing pipe (62) is hollow.

10. A wastewater treatment device for a paper mill workshop according to claim 9, characterized in that: The outer wall of the flow stabilizer (62) is fixed with a third feed pipe (8). The inner flow channels (81) are opened in the interior of the flow stabilizer (62), the third feed pipe (8), the second radial support plate (64) and the overflow pipe (12). The outer wall of the overflow pipe (12) is provided with a feed interface (82) that communicates with the inner flow channels (81).

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