An anaerobic treatment device and method for papermaking wastewater

Abstract

The application belongs to the technical field of papermaking wastewater treatment, and particularly relates to an anaerobic treatment equipment and method for papermaking wastewater, which comprises a device main body, the device main body comprises a sedimentation tank, a grid and an aeration tank arranged in sequence, and an aeration pipeline is arranged in the aeration tank; the purpose is to realize self-adaptive segmentation of air bubbles by arranging a bubble scattering outer cover and a hierarchical bubble scattering structure outside the aeration head, effectively solve the problem of fixed bubble size of the existing aeration device, the spikes of the first segmentation hole can preliminarily segment the air bubbles into small bubbles, the elastic rack of the second segmentation hole can self-adaptively adjust the aperture according to the aeration flow, the uniformity of air bubble segmentation is ensured, large air bubbles are avoided when the air intake increases, the contact area of the air bubbles and the water body is significantly increased, the air bubble floating time is prolonged, the oxygen dissolution efficiency is improved, sufficient oxygen is provided for the degradation of organic matter by aerobic microorganisms, and the aeration effect is improved.

Description

Technical Field

[0001] This invention belongs to the field of papermaking wastewater treatment technology, specifically relating to an anaerobic treatment device and method for papermaking wastewater. Background Technology

[0002] Paper mill wastewater treatment facilities typically combine multiple technologies and employ different treatment devices to remove pollutants from the wastewater, ensuring that the pollutants are effectively removed and that the discharged water meets environmental standards.

[0003] Currently, aeration equipment is commonly used in the treatment of papermaking wastewater to promote the decomposition of organic matter in the wastewater by aerobic microorganisms. As the core component of the aeration equipment, the size of the bubbles produced by the aeration head directly affects the aeration efficiency. Smaller bubbles have a larger contact area with the water, which facilitates oxygen dissolution and improves the aeration effect. However, existing aeration devices typically only output bubbles of a fixed aperture size and cannot adaptively adjust the bubble segmentation effect according to changes in air intake and water quality during the actual aeration process. When the air intake increases, a large amount of air cannot be fully segmented, resulting in larger bubbles that rise rapidly. This not only shortens the contact time between the bubbles and the water, reducing oxygen utilization, but also leads to uneven aeration, affecting the degradation effect of microorganisms and increasing unnecessary energy consumption. Summary of the Invention

[0004] In view of this, in order to solve the above problems, the present invention proposes an anaerobic treatment device and treatment method that can adaptively adjust the bubble size, improve aeration efficiency, and reduce energy consumption.

[0005] The technical solution adopted in this invention is as follows: An anaerobic treatment device for papermaking wastewater includes a main body comprising a sedimentation tank, a grid, and an aeration tank arranged sequentially. An aeration pipe is laid within the aeration tank, and an air supply pipe is connected to the outside of the aeration pipe. Multiple aeration heads are installed on the aeration pipe. Furthermore, a bubble-dispersing cover corresponding to each of the multiple aeration heads is installed on the aeration pipe, and the aeration heads are located inside the bubble-dispersing cover.

[0006] In some embodiments, the bubble-dispersing cover is provided with a bubble-dispersing structure, which includes: a first dividing hole, wherein a plurality of the first dividing holes are arrayed and formed on the surface of the bubble-dispersing cover; a connecting layer, wherein the connecting layer is a strip structure and its two ends are respectively connected between any two adjacent first dividing holes; and a second dividing hole, wherein the second dividing hole is formed on the connecting layer.

[0007] In some embodiments, the first dividing hole is a fixed hole, and the second dividing hole is an elastic hole.

[0008] In some embodiments, the first dividing hole is a circular hole, and the inner wall of the first dividing hole is provided with a plurality of spikes.

[0009] In some embodiments, the second dividing hole is a strip-shaped hole, and the inner walls on both sides of the second dividing hole are provided with intermeshing elastic racks, and the elastic racks extend along the length direction of the second dividing hole.

[0010] In some embodiments, the surface of the connecting layer is provided with an elastic groove, which communicates with both ends of the second dividing hole, wherein the depth of the elastic groove is shorter than the depth of the second dividing hole.

[0011] In some embodiments, a limiting band is further included, the two ends of which are fixed to the connecting layer, and the limiting band and the elastic groove are arranged in a cross shape, wherein a gap is left between the bottom of the limiting band and the opening of the elastic groove.

[0012] In some embodiments, a fixing frame is further included, which is disposed above the aeration pipe and whose bottom is fixed to the bottom of the aeration tank. The top of the fixing frame is provided with a retaining ring for the aeration head to pass through, and the foaming cover is assembled on the top of the fixing frame.

[0013] In some embodiments, the bottom of the sedimentation tank is provided with a sedimentation tank, and the top of the sedimentation tank is located below the grid.

[0014] A method for treating papermaking wastewater includes the following steps: S1. Wastewater enters a sedimentation tank for initial sedimentation, where sediment accumulates. S2. After initial sedimentation, the wastewater passes through a grid to remove unsedimented floating impurities. S3. The wastewater after removing floating impurities is transported to an aeration tank for aeration. High-pressure air is introduced through the aeration pipe and discharged through the aeration head. The air bubbles enter the bubble diffuser and are first split into multiple small bubbles by the spikes in the first dividing hole. Microorganisms degrade the organic matter in the wastewater through metabolism. S4. When the aeration flow rate increases, the water pressure opens the interlocking elastic racks at the second dividing hole, enlarging the diameter of the second dividing hole. At the same time, the elastic groove deforms to further adapt to the larger aeration volume. S5. The aerated wastewater is transported to an anaerobic treatment unit for anaerobic fermentation treatment, completing the purification treatment of the papermaking wastewater.

[0015] In summary, due to the adoption of the above technical solution, the beneficial effects of the present invention are: This invention achieves adaptive bubble segmentation by setting a bubble-dispersing cover and a graded bubble-dispersing structure on the outside of the aeration head. This effectively solves the problem of fixed bubble size in existing aeration devices. The spikes of the first segmenting hole can initially segment the bubble into small bubbles, and the elastic rack of the second segmenting hole can adaptively adjust the hole diameter according to the aeration flow rate. This ensures the uniformity of bubble segmentation and avoids the appearance of large bubbles when the air intake increases. It significantly increases the contact area between the bubbles and the water, prolongs the bubble floating time, improves oxygen dissolution efficiency, provides sufficient oxygen for aerobic microorganisms to degrade organic matter, and thus improves the aeration effect.

[0016] In this invention, when the aeration rate increases, the connection layer allows multiple first and second dividing holes to be combined into a complete hole surface, reducing dead angles in the dividing process. This enables the bubbles discharged from the aeration head to quickly and evenly contact the dividing channels, preventing local bubble accumulation and improving the bubble transmission and dividing efficiency. This further ensures the uniformity of bubble dividing and enhances the aeration effect.

[0017] This invention expands the aperture adjustment range of the second dividing hole through the coordinated operation of the elastic groove and the limiting band, adapting to different aeration flow fluctuation requirements. At the same time, it can limit excessive deformation of the connecting layer, avoid irreversible damage to the second dividing hole and the connecting layer, extend the service life of the bubble dispersion structure and the entire aeration device, ensure the stability of the bubble segmentation effect, and reduce the frequency of equipment maintenance.

[0018] This invention removes large particulate impurities and floating matter from papermaking wastewater in advance through graded sedimentation tanks and grids. This prevents large particulate impurities from entering the aeration tank and anaerobic treatment unit, causing pipe blockage, reducing the treatment load of subsequent treatment units, ensuring the stability of subsequent aeration and anaerobic fermentation treatment, thereby improving the wastewater treatment efficiency of the entire treatment system and reducing overall treatment energy consumption. Attached Figure Description

[0019] The present invention will be described by way of example and with reference to the accompanying drawings, wherein: Figure 1 This is a schematic diagram of the overall structure of the anaerobic treatment equipment for papermaking wastewater provided by the present invention.

[0020] Figure 2 This is a schematic diagram of the internal structure of the main body of the device provided by the present invention.

[0021] Figure 3 This is a schematic diagram of the structure of the bubble cover provided by the present invention.

[0022] Figure 4 This is a schematic diagram of the connection layer provided by the present invention.

[0023] Figure 5 This is an overall schematic diagram of the bubble-dispersing structure provided by the present invention.

[0024] Figure 6 This invention provides Figure 5 Enlarged diagram of point A in the middle.

[0025] Figure 7 This is a structural schematic diagram of the fixing frame provided by the present invention.

[0026] Figure 8 This is a cross-sectional schematic diagram of the main body of the device provided by the present invention.

[0027] 1. Main body of the device; 2. Sedimentation tank; 3. Grid mesh; 4. Aeration tank; 5. Aeration pipe; 6. Fixing frame; 7. Bubble diffuser cover; 8. First dividing hole; 9. Connecting layer; 10. Second dividing hole; 11. Elastic groove; 12. Limiting band; 13. Spike; 14. Elastic rack; 15. Snap ring; 16. Aeration head; 17. Sedimentation tank. Detailed Implementation

[0028] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0029] In existing technologies, aeration devices can usually only output bubbles with a fixed aperture size. They cannot adaptively adjust the bubble segmentation effect according to the air intake and water quality changes during the actual aeration process. When the air intake increases, a large amount of air cannot be fully segmented, resulting in larger bubbles that rise rapidly. This not only shortens the contact time between the bubbles and the water, reducing oxygen utilization, but also leads to uneven aeration, affecting the degradation effect of microorganisms and increasing unnecessary energy consumption.

[0030] Therefore, in order to solve the above problems and achieve adaptive adjustment of bubble size, improve aeration efficiency, and reduce energy consumption, this invention discloses an anaerobic treatment device for papermaking wastewater. (See attached document.) Figures 1-6 The device includes a main body 1, which includes a sedimentation tank 2, a grid 3 and an aeration tank 4 arranged in sequence. An aeration pipe 5 is laid in the aeration tank 4. An air supply pipe is connected to the outside of the aeration pipe 5, and multiple aeration heads 16 are provided on the aeration pipe 5. The aeration pipe 5 is also provided with a bubble-dispersing cover 7 corresponding to each of the multiple aeration heads 16. The aeration heads 16 are located inside the bubble-dispersing cover 7.

[0031] In this embodiment, the bubble-dispersing cover 7 is provided with a bubble-dispersing structure, which includes: a first dividing hole 8, a connecting layer 9, and a second dividing hole 10. The three work together to achieve graded segmentation and adaptive adjustment of bubbles. Multiple first dividing holes 8 are uniformly arrayed on the surface of the bubble-dispersing cover 7, serving as the first step in bubble segmentation. The connecting layer 9 is a strip structure, with its two ends fixedly connected between any two adjacent first dividing holes 8, connecting adjacent first dividing holes 8 and supporting the second dividing hole 10. The second dividing hole 10 is formed on the connecting layer 9, cooperating with the first dividing holes 8 to further segment the bubbles and adapt to different aeration flow rates.

[0032] The first dividing hole 8 is a fixed hole with a fixed diameter, mainly used for the initial segmentation of bubbles. The second dividing hole 10 is an elastic hole, which can adaptively adjust its diameter according to the aeration flow rate to meet different air intake requirements. Specifically, the first dividing hole 8 is a circular hole, and its inner wall is provided with multiple evenly distributed spikes 13. The spikes 13 are made of hard, corrosion-resistant material, which are sharp and not easily worn. When the bubbles discharged from the aeration head 16 enter the bubble diffuser 7, they will naturally diffuse outward. When passing through the first dividing hole 8, the bubbles will be pierced by the spikes 13 on the inner wall of the first dividing hole 8, and divided into multiple smaller, more evenly distributed bubbles. These bubbles then flow out of the bubble diffuser 7 and into the water body of the aeration tank 4, thereby increasing the contact area between the bubbles and the water body, prolonging the bubble floating time, improving oxygen dissolution efficiency, and providing sufficient oxygen for aerobic microorganisms to degrade organic matter in wastewater.

[0033] Furthermore, the second dividing hole 10 is a strip-shaped hole, and the inner walls on both sides of the second dividing hole 10 are provided with interlocking elastic racks 14. The elastic racks 14 are made of corrosion-resistant elastic material and extend along the length of the second dividing hole 10. Under normal conditions, the elastic racks 14 on both sides are interlocked, so that the second dividing hole 10 is in a closed or small-diameter state. When the high-pressure air flow rate introduced into the air supply pipeline increases, the amount of bubbles discharged by the aeration head 16 increases accordingly, the air pressure inside the bubble diffuser 7 increases, and the water pressure will push open the interlocking elastic racks 14 at the second dividing hole 10, so that the diameter of the second dividing hole 10 adaptively expands, thereby increasing the air volume and preventing a large amount of air from accumulating in the bubble diffuser 7 and being unable to be discharged; at the same time, the interlocking structure of the elastic racks 14 can ensure that the bubbles can still be divided a second time after the diameter is expanded, avoiding the appearance of large bubbles that are not divided, and ensuring the bubble division effect.

[0034] It should be noted that the connecting layer 9 is also made of elastic material, and it is an integral structure with the second dividing hole 10. The connecting layer 9 is fixedly embedded on the surface of the bubble cover 7.

[0035] To further enhance the elastic deformation capability of the second dividing hole 10 and adapt to a wider range of aeration flow rate changes, an elastic groove 11 is formed on the surface of the connecting layer 9. The elastic groove 11 is connected to both ends of the second dividing hole 10 to form a complete deformation space. The depth of the elastic groove 11 is shorter than the depth of the second dividing hole 10, which ensures the structural strength of the connecting layer 9 and allows the connecting layer 9 to undergo appropriate deformation under air pressure, further expanding the aperture adjustment range of the second dividing hole 10 and ensuring that effective bubble segmentation can still be achieved when the aeration flow rate fluctuates significantly.

[0036] Preferably, the device further includes a limiting band 12, the two ends of which are fixed to the connecting layer 9, and the limiting band 12 and the elastic groove 11 are arranged in a cross shape, wherein a gap is left between the bottom of the limiting band 12 and the opening of the elastic groove 11. The limiting band 12 is made of elastic material, and its function is to limit the excessive deformation of the connecting layer 9, to avoid irreversible deformation of the connecting layer 9 and the second dividing hole 10 due to excessive aeration flow rate and excessive air pressure, to extend the service life of the bubble dispersion structure, and at the same time to ensure that the aperture adjustment of the second dividing hole 10 is always within a reasonable range, thus ensuring the stability of bubble segmentation.

[0037] For further details, please refer to [link / reference]. Figures 7-8 To ensure the installation stability of the aeration pipe 5, aeration heads 16, and foam diffuser cover 7, this equipment also includes a fixing frame 6. The fixing frame 6 is located above the aeration pipe 5 and is made of corrosion-resistant metal. Its bottom is fixedly connected to the bottom of the aeration tank 4 by expansion bolts, ensuring a firm connection that is not easily loosened. The top of the fixing frame 6 has retaining rings 15 that correspond one-to-one with the aeration heads 16. The inner diameter of the retaining rings 15 is adapted to the outer diameter of the aeration heads 16, allowing the aeration heads 16 to pass through the retaining rings 15 and extend into the foam diffuser cover 7. The retaining rings 15 can limit and fix the aeration heads 16, preventing them from shaking or shifting due to airflow impact during aeration. The bubble-dispersing cover 7 is mounted on the top of the fixed frame 6. The bottom of the bubble-dispersing cover 7 is detachably connected to the top of the fixed frame 6 by bolts. This facilitates the installation and disassembly of the bubble-dispersing cover 7, making subsequent maintenance and cleaning easier. It also ensures that the relative position of the bubble-dispersing cover 7 and the aeration head 16 is fixed, ensuring that the bubbles can accurately enter the bubble-dispersing cover 7 for segmentation.

[0038] Furthermore, considering the high concentration of suspended particulate matter in papermaking wastewater, a sedimentation tank 17 is provided at the bottom of the sedimentation tank 2. The top of the sedimentation tank 17 is located below the grid 3. The sedimentation tank 17 and the sedimentation tank 2 are integrally formed, and the sedimentation tank 17 is deeper than the sedimentation tank 2, specifically designed to collect sediment from the papermaking wastewater. When the papermaking wastewater enters the sedimentation tank 2, under the influence of gravity, suspended particulate matter, silt, and other heavy objects in the wastewater will slowly settle and eventually accumulate in the sedimentation tank 17, achieving preliminary sedimentation and purification of the wastewater. The top of the sedimentation tank 17 is located below the grid 3, which prevents the sediment in the sedimentation tank 17 from being washed to the grid 3 by the water flow. It also facilitates subsequent centralized cleaning of the sediment in the sedimentation tank 17, reducing the cleaning frequency of the sedimentation tank 2 and lowering maintenance costs.

[0039] In summary, this invention also discloses a method for treating papermaking wastewater, applicable to the aforementioned anaerobic treatment equipment for papermaking wastewater. The specific treatment method is as follows, and should be strictly followed in an orderly manner: S1. Wastewater Pretreatment Sedimentation: The papermaking wastewater to be treated is transported to sedimentation tank 2 through the inlet pipe for preliminary sedimentation treatment. The wastewater flows slowly in sedimentation tank 2, and the suspended particles, silt, and large sediments in the wastewater settle due to gravity. The settled sediments accumulate in sedimentation tank 17 at the bottom of sedimentation tank 2, achieving preliminary purification of the wastewater and reducing the load on subsequent treatment.

[0040] S2. Impurity interception and filtration: After preliminary sedimentation, the wastewater slowly flows through the grid 3. The grid 3 adopts a fine metal mesh structure, which can effectively intercept unsedimented floating impurities in the wastewater, such as papermaking fiber fragments and small floating objects, to prevent such impurities from entering the subsequent aeration tank 4 and to prevent them from clogging the dividing channels on the aeration head 16 and the bubble diffuser cover 7, thus ensuring the long-term stable operation of the aeration device.

[0041] S3. Aeration and Degradation Treatment: After removing floating impurities, the wastewater is transported to the aeration tank 4 through a guide plate for aeration treatment. The air supply equipment is started, and high-pressure air is introduced into the aeration pipe 5 through the air supply pipeline. The high-pressure air is transported along the aeration pipe 5 to each aeration head 16, and after being discharged through the aeration head 16, it enters the bubble diffuser 7. The bubbles diffuse in the bubble diffuser 7, first passing through the first dividing hole 8, and are pierced by the spikes 13 on the inner wall of the first dividing hole 8, breaking into multiple smaller and more evenly distributed small bubbles. After the small bubbles flow out of the bubble diffuser 7, they are evenly dispersed in the water of the aeration tank 4, increasing the contact area between the bubbles and the water, prolonging the bubble floating time, and improving the oxygen dissolution efficiency. The aerobic microorganisms in the aeration tank 4 use the dissolved oxygen in the water to degrade the organic matter in the wastewater through metabolism, thereby achieving deep purification of the wastewater.

[0042] S4. Bubble Adaptive Adjustment: During aeration, when the airflow needs to be increased due to changes in pollutant concentration in the papermaking wastewater, the high-pressure airflow in the air supply pipeline increases accordingly. This increases the amount of bubbles discharged from the aeration head 16, raising the air pressure inside the bubble diffuser 7. The water pressure then pushes open the meshing elastic racks 14 at the second dividing hole 10, causing the aperture of the second dividing hole 10 to adaptively expand, thereby increasing the airflow and preventing a large amount of air from accumulating inside the bubble diffuser 7 and being unable to escape. Simultaneously, the elastic grooves 11 on the surface of the connecting layer 9 will deform moderately, further expanding the aperture adjustment range of the second dividing hole 10 to accommodate greater airflow requirements. The meshing structure of the elastic racks 14 can still perform secondary bubble segmentation, ensuring the bubble segmentation effect and preventing large bubbles from affecting aeration efficiency. The limiting band 12 restricts excessive deformation of the connecting layer 9, ensuring that the aperture adjustment of the second dividing hole 10 is within a reasonable range and preventing irreversible damage to the connecting layer 9 and the second dividing hole 10.

[0043] S5. Anaerobic Deep Treatment: After aeration, the wastewater is transported to the anaerobic treatment unit through a diversion pipeline. In the anaerobic treatment unit, anaerobic microorganisms ferment and decompose the remaining recalcitrant organic matter in the wastewater in an anaerobic environment, converting the organic matter into harmless gases and small molecules, further reducing the pollutant content in the wastewater, completing the comprehensive purification treatment of papermaking wastewater, and ensuring that the treated wastewater discharge meets environmental protection standards.

[0044] In addition, during long-term operation of the equipment, the drain outlet of the sedimentation tank 17 can be opened periodically to clean the accumulated sediment in the sedimentation tank 17; the bubble-dispersing cover 7 can be disassembled periodically to clean the first dividing hole 8 and the second dividing hole 10 on the bubble-dispersing structure and remove the blockages and impurities in the channels; the wear of the limiting band 12 and the elastic rack 14 can be checked, and damaged parts can be replaced in time to ensure long-term stable operation of the equipment, continuously improve the treatment effect of papermaking wastewater, and reduce operating energy consumption. The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. Similar or identical parts between embodiments can be referred to interchangeably.

[0045] The above description of the disclosed embodiments enables those skilled in the art to make or use the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. An anaerobic treatment device for papermaking wastewater, comprising a main body (1), wherein the main body (1) comprises a sedimentation tank (2), a grid (3), and an aeration tank (4) arranged sequentially, characterized in that, The aeration tank (4) is provided with an aeration pipe (5), which is connected to an air supply pipe. Multiple aeration heads (16) are provided on the aeration pipe (5). The aeration pipe (5) is also provided with a bubble-scattering cover (7) corresponding to each of the multiple aeration heads (16). The aeration heads (16) are located inside the bubble-scattering cover (7).

2. The anaerobic treatment equipment for papermaking wastewater according to claim 1, characterized in that, The bubble-dispersing cover (7) is provided with a bubble-dispersing structure, which includes: a first dividing hole (8), a plurality of first dividing holes (8) arrayed on the surface of the bubble-dispersing cover (7); a connecting layer (9), the connecting layer (9) is a strip structure, and the two ends of the connecting layer (9) are respectively connected between any two adjacent first dividing holes (8); and a second dividing hole (10), the second dividing hole (10) is provided on the connecting layer (9).

3. The anaerobic treatment equipment for papermaking wastewater according to claim 2, characterized in that, The first dividing hole (8) is a fixed hole, and the second dividing hole (10) is an elastic hole.

4. The anaerobic treatment equipment for papermaking wastewater according to claim 3, characterized in that, The first dividing hole (8) is a circular hole, and a plurality of spikes (13) are provided on the inner wall of the first dividing hole (8).

5. The anaerobic treatment equipment for papermaking wastewater according to claim 3, characterized in that, The second dividing hole (10) is a strip-shaped hole. The inner walls on both sides of the second dividing hole (10) are provided with intermeshing elastic racks (14), and the elastic racks (14) extend along the length direction of the second dividing hole (10).

6. The anaerobic treatment equipment for papermaking wastewater according to claim 2, characterized in that, The surface of the connecting layer (9) is provided with an elastic groove (11), which is connected to both ends of the second dividing hole (10). The depth of the elastic groove (11) is shorter than the depth of the second dividing hole (10).

7. The anaerobic treatment equipment for papermaking wastewater according to claim 6, characterized in that, It also includes a limiting band (12), the two ends of which are fixed on the connecting layer (9), and the limiting band (12) and the elastic groove (11) are arranged in a cross shape, wherein a gap is left between the bottom of the limiting band (12) and the opening of the elastic groove (11).

8. The anaerobic treatment equipment for papermaking wastewater according to claim 1, characterized in that, It also includes a fixing frame (6), which is located above the aeration pipe (5). The bottom of the fixing frame (6) is fixed to the bottom of the aeration tank (4). The top of the fixing frame (6) is provided with a retaining ring (15) for the aeration head (16) to pass through. The bubble diffuser cover (7) is assembled on the top of the fixing frame (6).

9. The anaerobic treatment equipment for papermaking wastewater according to claim 1, characterized in that, The sedimentation tank (2) has a sedimentation tank (17) at the bottom, and the top of the sedimentation tank (17) is located below the grid (3).

10. A method for treating papermaking wastewater, characterized in that, The anaerobic treatment equipment for papermaking wastewater as described in any one of claims 1-9 is applicable, and the treatment method is as follows: S1, the wastewater enters the sedimentation tank (2) for preliminary sedimentation, and the sediment accumulates in the sedimentation tank (17); S2, the wastewater after preliminary sedimentation passes through the grid (3) to remove unsedimented floating impurities; S3, the wastewater after removing floating impurities is transported to the aeration tank (4) for aeration treatment, and after high-pressure air is introduced into the aeration pipe (5), the air is discharged through the aeration head (16), and the bubbles enter the bubble diffuser (17). 7) After passing through the first dividing hole (8), it is divided into multiple small bubbles by the spikes (13). Microorganisms degrade the organic matter in the wastewater through metabolism. S4) When the aeration flow rate increases, the water pressure pushes open the meshing elastic racks (14) at the second dividing hole (10), making the diameter of the second dividing hole (10) larger. At the same time, the elastic groove (11) deforms to further adapt to the larger ventilation volume. S5) The wastewater after aeration is transported to the anaerobic treatment unit for anaerobic fermentation treatment to complete the purification treatment of papermaking wastewater.

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