A biological oxidation treatment device for wastewater of papermaking industry

Abstract

This invention relates to the technical field of biological oxidation treatment of papermaking wastewater, and in particular to a biological oxidation treatment device for papermaking wastewater. The device includes a treatment tank and an aeration base plate. The aeration base plate is installed on the bottom wall of the treatment tank. Multiple sets of treatment components are arranged inside the treatment tank, with their upper ends fixed to the upper end of the treatment tank. Each treatment component includes multiple connecting ropes and recessed frames. The upper end of the recessed frames is connected to the upper end of the treatment tank. Each pair of adjacent connecting ropes is connected by a floating head mechanism, which can float on the surface of the wastewater. This invention allows the wastewater in the treatment tank to sway under the influence of a swaying mechanism. The floating head mechanism sways with the water surface fluctuations, changing the position of the lower biological filling substrate. The suspension ropes pull the movable shaft to move within the central axis, deforming the biological filling substrate through the ropes and creating gaps between the surface-filled biological matrix, allowing the wastewater to fully contact the inner biological matrix.

Description

Technical Field

[0001] This invention relates to the technical field of biological oxidation treatment of wastewater from the paper industry, and in particular to a biological oxidation treatment device for wastewater from the paper industry. Background Technology

[0002] Biological contact oxidation involves placing packing material in a tank, aerating the bottom, and submerging all the packing material with oxygenated wastewater that flows through it at a controlled speed. A biofilm grows on the packing material, and the wastewater comes into contact with the biofilm, purifying the wastewater through the action of the microorganisms. Direct aeration under the packing material causes the biofilm to be impacted and agitated by the rising airflow, accelerating its shedding and renewal, thus maintaining its high activity and preventing clogging. Biological contact oxidation offers advantages such as high load capacity, high treatment efficiency, strong adaptability to influent shocks, rapid biofilm formation, no sludge return system, no sludge bulking hazards, and easy daily operation and management.

[0003] Chinese patent CN113292199A discloses an integrated wastewater treatment device combining hydrolysis acidification and biological oxidation. The hydrolysis acidification tank is equipped with a fixed water distribution pipe. A PAC / PAM dosing tank is fixedly installed on the right side of the hydrolysis acidification tank. A first sedimentation tank is fixedly installed on the right side of the PAC / PAM dosing tank. A first contact oxidation tank is fixedly installed on the right side of the first sedimentation tank. A second contact oxidation tank is fixedly installed on the right side of the first contact oxidation tank, and a second sedimentation tank is fixedly installed on the right side of the second contact oxidation tank. The disinfection system includes a biological filter and a disinfection tank respectively installed on the front and rear sides of the right side wall of the second sedimentation tank. This device offers good wastewater purification and treatment effects, high efficiency, reduced on-site construction work, reduced raw materials, and lower costs. It provides excellent sedimentation and filtration effects, effectively removing ammonia nitrogen and wastewater with poor biodegradability. Operation is convenient and simple.

[0004] The aforementioned technologies have the following drawbacks: biological filler substrates are generally fixed and suspended in the tank. During installation, the biological filler substrates are arranged in groups with close contact with each other, and then arranged in the tank. The gaps between the biological substrates in each group are small, and the biological substrates between adjacent gaps cannot fully contact the sewage. In addition, the position of the biological substrates is relatively fixed, and the contact between the substrates is entirely achieved by the flow of water, resulting in a low treatment effect. Summary of the Invention

[0005] To address the problems mentioned in the background art, the present invention provides a biological oxidation treatment device for papermaking wastewater.

[0006] The present invention provides a biological oxidation treatment device for papermaking wastewater, which adopts the following technical solution: it includes a treatment tank and an aeration bottom plate. The aeration bottom plate is installed on the bottom wall of the treatment tank. Multiple sets of treatment components are arranged inside the treatment tank, and the upper ends of the treatment components are fixed to the upper end of the treatment tank.

[0007] The treatment assembly includes multiple connecting ropes and a recessed frame. The upper end of the recessed frame is connected to the upper end of the treatment tank. Each pair of adjacent connecting ropes is connected by a floating head mechanism, which can float on the surface of the sewage. The outermost two connecting ropes are fixed to the inner wall of the recessed frame at their ends. A central shaft is coaxially mounted on the bottom surface of the floating head mechanism. A lifting rope that can move relative to the central shaft passes through the lower end of the central shaft. The lower end of the lifting rope is fixed to the recessed frame. The lifting rope and the central shaft are sealed together. A movable shaft that can move up and down elastically is installed inside the central shaft. The lifting rope and the movable shaft are fixed together.

[0008] Multiple biological filling substrates are installed on the outside of the central shaft. The biological filling substrates are made of elastic material and can rotate elastically relative to the central shaft. A threaded rope is installed at the end of the biological filling substrate away from the central shaft. The threaded rope passes through the outer surface of the central shaft and is fixed to the movable shaft. The threaded rope can move relative to the central shaft and is sealed to the central shaft.

[0009] The treatment tank is equipped with a shaking mechanism that pushes the water to sway inside, and a power mechanism that controls the reciprocating swaying of the shaking mechanism is installed on the outside of the treatment tank.

[0010] Optionally, the floating head mechanism includes an outer shell and a hollow floating disk. The hollow floating disk is located inside the outer shell and is fixed to two adjacent connecting ropes. The connecting ropes pass through the inner side of the outer shell and can pull the hollow floating disk to rotate relative to the outer shell. The central shaft is coaxially installed on the bottom surface of the outer shell.

[0011] Optionally, the biological filling substrate consists of two plates, both plates of which are made of elastic material. Both ends of the two plates are connected by elastic bent plates. One of the elastic bent plates, which is closer to the central axis, slides on the surface of the rope, while the other elastic bent plate is fixed to the rope. The organisms are dispersed in columnar form on the outside of the biological filling substrate. One of the elastic bent plates, which is closer to the central axis, is connected to the central axis.

[0012] Optionally, the swaying mechanism includes two swaying components and two parallel frames. The two parallel frames are mounted on the upper surface of the aeration base plate, and the swaying components slide horizontally on the outside of the parallel frames. The swaying components are offset from the floating head mechanism.

[0013] Optionally, the swaying assembly includes a sleeve and multiple vertical swaying frames. The sleeve is fixed to the lower end of each vertical swaying frame. The sleeve is fitted over the outside of the parallel frame and slides on the outside of the parallel frame. The sleeve is connected to a power mechanism.

[0014] Multiple water-dispensing plates are installed inside each vertical swaying frame. The lower end of each water-dispensing plate can rotate relative to the vertical swaying frame it is connected to. Fixed angle rods are installed on both sides of each water-dispensing plate in the vertical swaying frame.

[0015] Optionally, the parallel frame, the sleeve frame, the vertical swaying frame, and the water-dispensing plate are all hollow inside. The vertical swaying frame is connected to the interior of the parallel frame through the sleeve frame, the interior of the parallel frame is connected to the interior of the aeration bottom plate, and the interior of the water-dispensing plate is connected to the rotation shaft of the vertical swaying frame and the interior of the vertical swaying frame.

[0016] Both the outer side of the vertical swaying frame and the upper end of the water-repelling plate are provided with aeration holes that communicate with the interior.

[0017] Optionally, the power mechanism includes a motor, a rotating plate, and an inner groove plate. The inner groove plate is fixed to one end of the sleeve located outside the treatment pool. A through groove is opened on the upper surface of the inner groove plate. A sliding shaft is slidably inserted into the groove of the inner groove plate. The upper end of the sliding shaft is rotatably connected to the rotating plate. The other end of the rotating plate is fixed to the output end of the motor. The motor is fixed to the outside of the treatment pool.

[0018] Optionally, the recessed frame is rectangular in shape, and multiple recessed frames are distributed at equal intervals inside the treatment pool.

[0019] Optionally, multiple biological filling substrates connected to the same central axis are arranged in multiple groups. The multiple biological filling substrates in each group are arranged in a circular array around the axis of the central axis they are connected to, and the biological filling substrates in adjacent upper and lower groups are staggered along the circumferential direction.

[0020] Optionally, the end of the biofilled substrate near the connected central axis is located on the upper side of the other end, and a gravity rod is installed at the lowest end of the two plates of the biofilled substrate. The two plates of the biofilled substrate are arranged in a symmetrical arc-shaped recess on the side close to each other.

[0021] In summary, the present invention has the following beneficial technical effects: This invention utilizes a combination of mechanisms, including a floating head mechanism, a biological filling substrate, a rope threading mechanism, and a swaying mechanism. The wastewater in the treatment tank sways under the swaying mechanism, and the floating head mechanism sways in response to the water surface fluctuations. During this swaying, the position of the lower biological filling substrate changes. Simultaneously, as the central axis moves relative to the recessed frame, the suspension rope pulls the movable shaft within the central axis. The rope threading deforms the biological filling substrate, creating gaps between the surface-filled biological matrix. This allows the wastewater to fully contact the inner biological matrix, improving the purification speed.

[0022] This invention utilizes the coordination between a water-dispersing plate, a fixed-angle rod, and a vertically swaying frame. The water-dispersing plate and the vertically swaying frame aerate the water from inside the treatment tank outwards, impacting the wastewater and the biological packing substrate. During the reciprocating swing of the vertically swaying frame, the dispersing plate contacts the fixed-angle rods on both sides under the resistance of the water flow, changing the tilt angle of the water-dispersing plate, increasing the range of aeration and impact water flow, further increasing the direction of water flow, and increasing the mixing degree of wastewater.

[0023] This invention, through the coordination of components such as an inner tank plate, a rotating plate, and a sliding shaft, allows the rotating plate to drive the sliding shaft to slide inside the inner tank plate. The inner tank plate then pulls the sleeve frame to move linearly at varying speeds. This effectively prevents the swaying caused by sewage during the reciprocating uniform swaying of the sleeve frame, which would otherwise result in a monotonous swaying effect. The variable speed propels the sewage to sway, changing the flow state of the sewage and the deformation and range of motion of the biological filling substrate. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the overall structure in an embodiment of the present invention; Figure 2 This is a schematic diagram of the internal structure of the processing pool in an embodiment of the present invention; Figure 3 This is a schematic diagram of the power mechanism in an embodiment of the present invention; Figure 4 This is a schematic diagram of the swaying mechanism in an embodiment of the present invention; Figure 5 This is a schematic diagram of the structure of the processing component in an embodiment of the present invention; Figure 6 This is a schematic diagram of the structure of the shaking component in an embodiment of the present invention; Figure 7 This is a schematic diagram of the structure inside the central axis in an embodiment of the present invention; Figure 8 This is an embodiment of the present invention. Figure 4 Enlarged structural diagram at point A; Figure 9 This is a top view schematic diagram of some structures in an embodiment of the present invention; Figure 10 This is a schematic diagram of the structure of the biological filling substrate in an embodiment of the present invention.

[0025] Reference numerals: 1. Treatment tank; 2. Aeration bottom plate; 3. Treatment component; 31. Connecting rope; 32. Recessed frame; 33. Floating head mechanism; 331. Outer shell; 332. Hollow floating plate; 34. Lifting rope; 35. Central shaft; 36. Movable shaft; 37. Biological filling substrate; 371. Elastic bending plate; 372. Gravity rod; 38. Rope threading; 4. Swaying mechanism; 41. Swaying component; 411. Sleeve; 412. Vertical swaying frame; 413. Water-dispelling plate; 414. Angle rod; 42. Parallel frame; 5. Power mechanism; 51. Motor; 52. Rotating plate; 53. Inner tank plate; 54. Sliding shaft. Detailed Implementation

[0026] The following is in conjunction with the appendix Figures 1-10 The present invention will be described in further detail below.

[0027] This invention discloses a biological oxidation treatment device for wastewater from the papermaking industry. For example... Figures 1-10As shown, it includes a treatment tank 1 and an aeration base plate 2. The aeration base plate 2 is installed on the inner bottom wall of the treatment tank 1. Multiple sets of treatment components 3 are arranged inside the treatment tank 1, and the upper end of the treatment components 3 is fixed to the upper end of the treatment tank 1.

[0028] Treatment tank 1 is equipped with pipes for pumping out and supplying sewage. The sewage purified in treatment tank 1 is then filtered through a filter, and the sludge and residual sludge are discharged to a sludge tank for further treatment after concentration and drying.

[0029] A blower is installed on the outside of the treatment tank 1. The blower is a "Roots blower: 3 units in total (2 working and 1 standby)" with single unit performance of Q=19.0m3 / min, H=0.5Mpa, N=22kw, n=1400rpm. Air is blown into the aeration bottom plate 2 through the pipe. The aeration bottom plate 2 has micropores. Aeration is carried out from the bottom of the treatment tank 1, and the aerated gas floats upward and impacts the water flow.

[0030] A dosing device is installed on the outside of treatment tank 1. The dosing system adds PAC, PAM and adjusts pH. The dosing pumps are 6 units of 103 pumps with a power of N=0.55kW. There are 3 dissolving tanks (1 cubic meter each) and 3 sets of dissolving agitators with a power of N=0.55kW.

[0031] The processing component 3 includes multiple connecting ropes 31 and recessed frames 32. The upper end of the recessed frame 32 is connected to the upper end of the processing pool 1. The recessed frame 32 is rectangular in shape. Multiple recessed frames 32 are evenly distributed inside the processing pool 1. The material of the recessed frame 32 is stainless steel.

[0032] Each pair of adjacent connecting ropes 31 is connected by a floating head mechanism 33, which can float on the surface of sewage. The outermost two connecting ropes 31 are fixed at opposite ends to the inner wall of the recessed frame 32. A central shaft 35 is coaxially mounted on the bottom surface of the floating head mechanism 33. A movable suspension rope 34 passes through the lower end of the central shaft 35. The lower end of the suspension rope 34 is fixed to the recessed frame 32. The suspension rope 34 and the central shaft 35 are sealed together to prevent sewage from entering the inner side of the central shaft 35. The central shaft 35 is made of stainless steel. A movable shaft 36 that can move up and down elastically is installed inside the central shaft 35. The suspension rope 34 is fixed to the movable shaft 36. A spring is installed at the bottom of the central shaft 35. The lower end of the spring is connected to the bottom wall of the central shaft 35. The suspension rope 34 passes through the inner side of the spring. The spring has a tendency to push the suspension rope 34 to tighten.

[0033] The floating head mechanism 33 includes an outer shell 331 and a hollow floating plate 332. The hollow floating plate 332 can float on the surface of sewage, so that the structure connected to the lower side is suspended inside the sewage. The hollow floating plate 332 is located inside the outer shell 331 and is fixed to two adjacent connecting ropes 31. The connecting ropes 31 pass through the inner side of the outer shell 331 and are sealed to the outer shell 331. The connecting ropes 31 are made of corrosion-resistant material and can pull the hollow floating plate 332 to rotate relative to the outer shell 331. The central shaft 35 is coaxially installed on the bottom surface of the outer shell 331.

[0034] Two fan-shaped springs are provided inside the outer shell 331. The connecting rope 31 is located inside the fan-shaped springs. The two ends of the fan-shaped springs are connected to the hollow floating disk 332 and the outer shell 331 respectively, which has the function of tightening the connecting rope 31. As the outer shell 331 moves up and down with the hollow floating disk 332, the connecting rope 31 is repeatedly pulled out from the outer shell 331, while pulling the hollow floating disk 332 to rotate relative to the outer shell 331. The outer shell 331 drives the connected central shaft 35 to rotate relative to the hollow floating disk 332.

[0035] Multiple biological filling substrates 37 are installed on the outside of the central shaft 35. The biological filling substrates 37 are made of elastic material. The multiple biological filling substrates 37 connected to the same central shaft 35 are arranged in multiple groups. The multiple biological filling substrates 37 in each group are arranged in a circular array around the axis of the central shaft 35. The biological filling substrates 37 in adjacent upper and lower groups are staggered along the circumferential direction. The circumferentially staggered biological filling substrates 37 move up and down with the central shaft 35. With fewer biological filling substrates 37, a larger area of ​​sewage can be purified.

[0036] The biological filling substrate 37 can rotate elastically relative to the central axis 35. A rope 38 is installed at the end of the biological filling substrate 37 away from the central axis 35. The rope 34 and the rope 38 are made of corrosion-resistant material. The rope 38 passes through the outer surface of the central axis 35 and is fixed to the movable shaft 36.

[0037] The biological filling substrate 37 consists of two plates. The two plates of the biological filling substrate 37 are made of elastic material. Both ends of the two plates of the biological filling substrate 37 are connected by elastic bending plates 371. One of the elastic bending plates 371, which is closer to the central axis 35, slides on the surface of the threaded rope 38, while the other elastic bending plate 371 is fixed to the threaded rope 38. The organisms are dispersed and filled in columnar form on the outside of the biological filling substrate 37. The elastic bending plate 371, which is closer to the central axis 35, is connected to the central axis 35.

[0038] The biological filling substrate 37 is located on the upper side of the other end near the central axis 35 it is connected to. Gravity rods 372 are installed at the bottom of the two plates of the biological filling substrate 37. The gravity rods 372 make the biological filling substrate 37 initially in a state where one side is higher than the other, so that it can contact the sewage at different heights.

[0039] The two plates of the biological filling substrate 37 are arranged in a symmetrical arc-shaped recess on one side, which helps to limit the deformation direction of the two plates of the biological filling substrate 37. At the same time, the elastic bending plates 371 at both ends are elastically bent. When the movable shaft 36 moves relative to the central axis 35 and applies tension to the threaded rope 38, the threaded rope 38 pulls the elastic bending plate 371 on the outside of the biological filling substrate 37, so that the middle part of the two plates of the biological filling substrate 37 is elastically bent away from each other. During the plate-shaped deformation of the biological filling substrate 37, the columnar biological filler on the surface forms gaps at a certain angle, and sewage enters the gaps and contacts the inner matrix.

[0040] The rope 38 can move relative to the central shaft 35, and the rope 38 and the central shaft 35 are sealed together so that sewage will not enter the inner side of the central shaft 35 through the gap between the rope 38 and the central shaft 35.

[0041] The treatment tank 1 is equipped with a shaking mechanism 4 that pushes the water to shake, and the treatment tank 1 is equipped with a power mechanism 5 that controls the reciprocating shaking of the shaking mechanism 4 on the outside.

[0042] The swaying mechanism 4 includes two swaying components 41 and two parallel frames 42. The two parallel frames 42 are installed on the upper surface of the aeration base plate 2. The swaying components 41 slide horizontally on the outside of the parallel frames 42. The swaying components 41 are offset from the floating head mechanism 33. The swaying components 41 will not collide with the central shaft 35 and the biological filling substrate 37 when moving.

[0043] The swaying assembly 41 includes a sleeve 411 and a plurality of vertical swaying frames 412. The sleeve 411 is fixed to the lower end of each vertical swaying frame 412. The sleeve 411 is sleeved on the outside of the parallel frame 42 and slides on the outside of the parallel frame 42. The sleeve 411 is connected to the power mechanism 5.

[0044] Multiple water-dispelling plates 413 are installed inside each vertical swaying frame 412. The lower end of the water-dispelling plate 413 can rotate relative to the vertical swaying frame 412 to which it is connected. Angle rods 414 are installed on both sides of each water-dispelling plate 413 in the vertical swaying frame 412. When the water-dispelling plate 413 follows the vertical swaying frame 412 to sway, the water-dispelling plate 413 rotates to the side opposite to the direction of movement under the damping of the water flow. The angle rods 414 support the rotating water-dispelling plate 413 and limit the angle at which the water-dispelling plate 413 finally stops. Then, as the water-dispelling plate 413 and the vertical swaying frame 412 continue to move, they apply a pushing force to the sewage, causing the sewage to be dispelled and ripples to be generated on the surface of the sewage.

[0045] The parallel frame 42, the sleeve frame 411, the vertical shaking frame 412, and the water-dispensing plate 413 are all hollow inside. The vertical shaking frame 412 is connected to the interior of the parallel frame 42 through the sleeve frame 411. The interior of the parallel frame 42 is connected to the interior of the aeration base plate 2. The interior of the water-dispensing plate 413 is connected to the rotation shaft of the vertical shaking frame 412 and the interior of the vertical shaking frame 412. The gas in the aeration base plate 2 enters the vertical shaking frame 412 and the water-dispensing plate 413 through the parallel frame 42 and the sleeve frame 411. At the same time, the connection between the sleeve frame 411 and the parallel frame 42 is airtight, ensuring that there is no air leakage when the sleeve frame 411 slides. The connection between the water-dispensing plate 413 and the vertical shaking frame 412 is airtight, ensuring that there is no gas leakage when the water-dispensing plate 413 rotates, so that there is sufficient air pressure inside.

[0046] Aeration holes communicating with the interior are provided on the outer side of the vertical shaking frame 412 and the upper end of the water deflector 413. The water deflector 413 and the vertical shaking frame 412 discharge air bubbles from the middle part of the sewage, increasing the flow direction and aeration range of the water. At the same time, as the water deflector 413 rotates relative to the vertical shaking frame 412, it changes the angle of the ejected air bubbles, further increasing the flow direction of the water and increasing the mixing degree of the sewage.

[0047] The power mechanism 5 includes a motor 51, a rotating plate 52, and an inner groove plate 53. The inner groove plate 53 is fixed to one end of the sleeve 411 located outside the treatment tank 1. A through groove is formed on the upper surface of the inner groove plate 53. A sliding shaft 54 ​​is slidably inserted into the groove of the inner groove plate 53. The upper end of the sliding shaft 54 ​​is rotatably connected to the rotating plate 52. The other end of the rotating plate 52 is fixed to the output end of the motor 51. The motor 51 is fixed to the outside of the treatment tank 1. The output shaft of the motor 51 drives the sliding shaft 54 ​​to slide within the groove of the inner groove plate 53 through the rotating plate 52. The length of the groove of the inner groove plate 53 is guaranteed to ensure that the sliding shaft 54... When the motor 51 rotates, the sliding shaft 54 ​​can slide in the groove of the inner trough plate 53 without getting stuck. At the same time, when the motor 51 rotates at a stable speed, the sliding shaft 54 ​​moves the inner trough plate 53 at different positions in the groove of the inner trough plate 53 at different speeds. Subsequently, the moving speed of the water-dispensing plate 413 and the vertical shaking frame 412 is variable, which effectively prevents the sewage from resonating and generating large waves, causing the sewage to overflow from the treatment tank 1. At the same time, the different moving speeds cause the biological filling substrate 37 to bend and swing at different degrees, resulting in different degrees of contact with the sewage.

[0048] The working principle is as follows: The wastewater to be treated is added into the treatment tank 1. The floating head mechanism 33 floats on the surface of the wastewater under the buoyancy of the wastewater. The central shaft 35 and the biological filling substrate 37 are suspended inside the wastewater under the floating head mechanism 33. The power mechanism 5 drives the shaking mechanism 4 to shake back and forth inside the wastewater, so that the wastewater moves. At the same time, the surface of the wastewater fluctuates. The floating head mechanism 33 follows the wastewater and shakes under the fluctuating surface, which drives the central shaft 35 and the biological filling substrate 37 to shake up and down synchronously. As the central shaft 35 moves relative to the recessed frame 32, the recessed frame 32 pulls the movable shaft 36 up and down inside the central shaft 35 through the suspension rope 34. The threaded rope 38 applies a pulling force to the biological filling substrate 37 as it moves with the movable shaft 36. When the biological filling substrate 37 is subjected to the pulling force, it undergoes elastic bending deformation, and gaps are created between the biological substrates filled on the surface, allowing the wastewater to contact the substrate inside.

[0049] The above are all preferred embodiments of the present invention and are not intended to limit the scope of protection of the present invention. Therefore, all equivalent changes made in accordance with the structure, shape and principle of the present invention should be covered within the scope of protection of the present invention.

Claims

1. An apparatus for the biological oxidation treatment of wastewater from the paper industry, comprising a treatment tank and an aeration floor, characterized in that: The aeration bottom plate is installed on the bottom wall of the treatment tank. Multiple sets of treatment components are arranged inside the treatment tank, and the upper ends of the treatment components are fixed to the upper end of the treatment tank. The treatment assembly includes multiple connecting ropes and a recessed frame. The upper end of the recessed frame is connected to the upper end of the treatment tank. Each pair of adjacent connecting ropes is connected by a floating head mechanism, which can float on the surface of the sewage. The outermost two connecting ropes are fixed to the inner wall of the recessed frame at their ends. A central shaft is coaxially mounted on the bottom surface of the floating head mechanism. A lifting rope that can move relative to the central shaft passes through the lower end of the central shaft. The lower end of the lifting rope is fixed to the recessed frame. The lifting rope and the central shaft are sealed together. A movable shaft that can move up and down elastically is installed inside the central shaft. The lifting rope is fixed to the movable shaft. Multiple biological filling substrates are installed on the outside of the central shaft. The biological filling substrates are made of elastic material and can rotate elastically relative to the central shaft. A threaded rope is installed at the end of the biological filling substrate away from the central shaft. The threaded rope passes through the outer surface of the central shaft and is fixed to the movable shaft. The threaded rope can move relative to the central shaft and is sealed to the central shaft. The treatment tank is equipped with a shaking mechanism that pushes the water to sway inside, and a power mechanism that controls the reciprocating swaying of the shaking mechanism is installed on the outside of the treatment tank. The floating head mechanism includes an outer shell and a hollow floating disk. The hollow floating disk is located inside the outer shell and is fixed to two adjacent connecting ropes. The connecting ropes pass through the inner side of the outer shell and can pull the hollow floating disk to rotate relative to the outer shell. The central shaft is coaxially installed on the bottom surface of the outer shell. The biological filling substrate consists of two plates, both of which are made of elastic material. The two plates are connected at both ends by elastic bending plates. One of the elastic bending plates, which is closer to the central axis, slides on the surface of the rope threading, while the other elastic bending plate is fixed to the rope threading. The elastic bending plate closer to the central axis is connected to the central axis.

2. A biological oxidation treatment apparatus for wastewater of a papermaking industry according to claim 1, characterized by: The swaying mechanism includes two swaying components and two parallel frames. The two parallel frames are installed on the upper surface of the aeration bottom plate. The swaying components slide horizontally on the outside of the parallel frames. The swaying components are offset from the floating head mechanism.

3. The biological oxidation treatment equipment for papermaking wastewater according to claim 2, characterized in that: The swaying assembly includes a sleeve and multiple vertical swaying frames. The sleeve is fixed to the lower end of each vertical swaying frame. The sleeve is fitted over the outside of the parallel frame and slides on the outside of the parallel frame. The sleeve is connected to the power mechanism. Multiple water-dispensing plates are installed inside each vertical swaying frame. The lower end of each water-dispensing plate can rotate relative to the vertical swaying frame it is connected to. Fixed angle rods are installed on both sides of each water-dispensing plate in the vertical swaying frame.

4. A biological oxidation treatment apparatus for wastewater of a papermaking industry according to claim 3, characterized in that: The parallel frame, the sleeve frame, the vertical swaying frame, and the water-dispensing plate are all hollow inside. The vertical swaying frame is connected to the interior of the parallel frame through the sleeve frame. The interior of the parallel frame is connected to the interior of the aeration bottom plate. The interior of the water-dispensing plate is connected to the rotation shaft of the vertical swaying frame and the interior of the vertical swaying frame. Both the outer side of the vertical swaying frame and the upper end of the water-repelling plate are provided with aeration holes that communicate with the interior.

5. A biological oxidation treatment apparatus for wastewater of a papermaking industry according to claim 4, characterized in that: The power mechanism includes a motor, a rotating plate, and an inner groove plate. The inner groove plate is fixed to one end of the sleeve located outside the treatment tank. A through groove is opened on the upper surface of the inner groove plate. A sliding shaft is slidably inserted into the groove of the inner groove plate. The upper end of the sliding shaft is rotatably connected to the rotating plate. The other end of the rotating plate is fixed to the output end of the motor. The motor is fixed to the outside of the treatment tank.

6. A biological oxidation treatment apparatus for wastewater of a papermaking industry according to claim 1, characterized by: The recessed frame is rectangular in shape, and multiple recessed frames are distributed at equal intervals inside the treatment pool.

7. A biological oxidation treatment device for papermaking wastewater according to claim 1, characterized in that: Multiple biological filling substrates connected to the same central axis are arranged in multiple groups. The multiple biological filling substrates in each group are arranged in a circular array around the axis of the central axis they are connected to. The biological filling substrates in adjacent upper and lower groups are staggered along the circumferential direction.

8. A biological oxidation treatment device for papermaking wastewater according to claim 2, characterized in that: The end of the bio-filled substrate near the central axis is located on the upper side of the other end. Gravity rods are installed at the bottom of the two plates of the bio-filled substrate, and the two plates of the bio-filled substrate are arranged in a symmetrical arc-shaped recess on the side close to each other.

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