Composite aeration device

Abstract

The application provides a composite aeration device, which comprises an aeration box for containing and carrying aeration mechanisms, a perforated gas supply pipeline for supplying gas to the aeration mechanisms, and a plurality of aeration mechanisms for emitting continuous aeration and intermittent aeration, wherein the aeration mechanisms are arranged in the aeration box in parallel at intervals. The aeration mechanism comprises a closed aeration box body, a plurality of partitions are arranged in the aeration box body, the space in the aeration box body is divided into a plurality of continuous aeration cavities and a plurality of intermittent aeration cavities by the partitions, and the continuous aeration cavities and the intermittent aeration cavities are arranged in sequence at intervals. A continuous aeration pipe is arranged in each continuous aeration cavity, and an intermittent aeration pipe is arranged in each intermittent aeration cavity. The continuous aeration pipe is a vertical straight pipe, and the top of the continuous aeration pipe penetrates the top of the aeration box body. The intermittent aeration pipe is a vertical U-shaped pipe with different heights, and the high end of the intermittent aeration pipe penetrates the top of the aeration box body to perform intermittent aeration. The composite aeration device can realize continuous aeration and intermittent aeration simultaneously.

Description

Technical Field

[0001] This invention belongs to the field of membrane bioreactor technology, and particularly relates to a composite aeration device. Background Technology

[0002] Submerged membrane bioreactors (MBRs) are an organic combination of membrane separation technology and biotechnology. They use ultrafiltration or microfiltration membrane separation technology to replace the secondary sedimentation tank and conventional filtration units of traditional activated sludge processes, achieving complete separation of hydraulic retention time (HRT) and sludge retention time (STR). This is a highly efficient and economical wastewater resource recovery technology with excellent solid-liquid separation capabilities. It produces high-quality effluent with near-zero suspended solids and turbidity, and can retain biological pollutants such as E. coli. Furthermore, because the effluent quality is significantly better than that of traditional wastewater treatment processes, the treated water can be directly reused, making it a promising technology with broad application prospects.

[0003] The membrane module is the core component of a submerged membrane bioreactor (MBR), and its reliability and stability directly determine the application effect of the MBR. The membrane element is the water-producing component of the MBR and is a crucial part of the system; its performance directly determines the overall performance of the MBR. During water production, impurities in the wastewater adhere to the membrane surface, affecting water production performance. Therefore, aeration and scrubbing of the membrane surface are necessary to reduce impurity adhesion.

[0004] Existing aeration devices typically employ either constant or intermittent aeration. Prolonged constant aeration leads to a dynamic equilibrium, which gradually fouls the membrane elements. Intermittent aeration, on the other hand, causes irreversible membrane fouling when all pores stop aeration, as the membrane continues to draw air. Even with subsequent intermittent aeration, it is difficult to restore membrane performance. Simply combining mechanisms that generate constant and intermittent aeration increases equipment costs, occupies a large space, and increases gas consumption, thus raising operating costs.

[0005] Therefore, it is necessary to provide a composite aeration device to solve or at least partially solve the above problems. Summary of the Invention

[0006] This invention provides a composite aeration device that optimizes the aeration mechanism, achieves a reasonable deployment of constant and intermittent aeration, reduces gas consumption and lowers operating costs without increasing equipment costs.

[0007] To achieve the above objectives, the present invention provides the following technical solution:

[0008] A composite aeration device, comprising:

[0009] An aeration box is used to house and support an aeration mechanism, and the aeration box is placed in a wastewater purification tank;

[0010] Perforated air supply pipes are used to supply air to the aeration mechanism;

[0011] An aeration mechanism is provided for providing both constant and intermittent aeration. Multiple aeration mechanisms are provided, arranged in parallel and at intervals in the aeration box, allowing water from the wastewater purification tank to enter.

[0012] The aeration mechanism includes a closed aeration box with multiple partitions dividing the space within the box into multiple constant aeration chambers and multiple intermittent aeration chambers. The constant aeration chambers and intermittent aeration chambers are spaced apart sequentially. Each constant aeration chamber contains a constant aeration pipe, and each intermittent aeration chamber contains an intermittent aeration pipe. The constant aeration pipe is a vertically aligned straight pipe with a constant air outlet at the top and a constant air inlet at the bottom, extending from the top of the aeration box for constant aeration. The intermittent aeration pipe is a vertically aligned U-shaped pipe of unequal height, with an intermittent air outlet at the higher end and an intermittent air inlet at the other end, extending from the top of the aeration box for intermittent aeration.

[0013] The perforated air supply pipeline is connected to the constant aeration chamber and the intermittent aeration chamber respectively to supply air;

[0014] When the aeration mechanism is working normally, the liquid level in the constant aeration chamber is lower than the air inlet of the constant aeration pipe, maintaining continuous aeration at a certain pressure; aeration occurs as the liquid level in the intermittent aeration chamber rises from the bottom of the intermittent aeration pipe to the intermittent air inlet, and aeration stops and air is replenished as the liquid level in the intermittent aeration chamber drops from above the intermittent air inlet to the bottom of the intermittent aeration pipe.

[0015] Optionally, the replenishment time T1 and aeration time T2 of the intermittent aeration chamber are calculated using the following formula:

[0016]

[0017]

[0018] Where T1 is the air replenishment time; S1 is the cross-sectional area of ​​the intermittent aeration chamber; H is the height difference between the intermittent air inlet of the intermittent aeration pipe and the bottom of the intermittent aeration pipe; Q1 is the air inlet flow rate of the intermittent aeration chamber; T2 is the aeration time; S2 is the cross-sectional area of ​​the intermittent aeration pipe; and Q2 is the aeration flow rate per unit area of ​​the intermittent aeration pipe.

[0019] Optionally, the intermittent air outlet is 30mm-80mm above the top of the aeration box, the intermittent air inlet is 20mm-50mm below the top of the aeration box, the distance between the intermittent air inlet and the bottom of the intermittent aeration pipe is 80mm-150mm, and the diameter of the intermittent aeration pipe is 8mm-12mm.

[0020] Optionally, the height of the constant air outlet above the top of the aeration box is 30mm-80mm, and the height of the constant air inlet below the top of the aeration box is 80mm-120mm; the diameter of the constant aeration pipe is 6mm-12mm.

[0021] Optionally, the partition is provided with a connecting hole near the bottom, the connecting hole connecting the constant aeration chamber and the intermittent aeration chamber.

[0022] Optionally, each of the sidewalls of the intermittent aeration chambers is provided with a through aeration hole, the height of which is lower than the bottom of the intermittent aeration pipe and higher than the height of the connecting hole; there are multiple aeration holes, which are evenly spaced apart.

[0023] Optionally, the top of the aeration box is provided with a slope.

[0024] Optionally, the perforated air supply pipeline includes an air inlet pipe, a circulation inner pipe, and aeration branch pipes. There are multiple aeration branch pipes arranged in parallel. The air inlet pipe and the circulation inner pipe are respectively located at both ends of the multiple aeration branch pipes and connected to the multiple aeration branch pipes. The air inlet pipe is connected to an external air supply device. The air inlet pipe is located on the outside of the aeration box, and the circulation inner pipe is located on the inside of the aeration box.

[0025] Optionally, the number of aeration branch pipes is the same as the number of aeration mechanisms, and multiple aeration branch pipes are arranged in a one-to-one correspondence with multiple aeration mechanisms. Multiple air inlets are provided on the aeration branch pipes, and the air inlets are arranged in a one-to-one correspondence with the constant aeration chamber and the intermittent aeration chamber to supply air to the constant aeration chamber and the intermittent aeration chamber.

[0026] Optionally, the aeration box includes a box frame, with fixing strips and fixing blocks provided on both sides of the middle part of the box frame. The fixing strips are used to support the aeration mechanism, and the fixing blocks are used to support the perforated air supply pipeline. The bottom of the box frame is provided with feet, and the box frame is provided with sealing plates around its perimeter.

[0027] Compared with the prior art, the technical solution of the present invention has beneficial effects.

[0028] For example, the composite aeration device provided by this invention has an aeration mechanism with a constant aeration chamber and an intermittent aeration chamber at intervals. The constant aeration chamber is equipped with a vertical straight-tube constant aeration pipe to achieve continuous constant aeration at a certain pressure. The intermittent aeration chamber is equipped with an intermittent aeration pipe, which is a U-shaped pipe of unequal height. Intermittent aeration is achieved through the height difference between the two ends and the bottom of the U-shaped pipe. Without the need to add air supply pipelines and control valves, the combination of constant and intermittent aeration is achieved. The intermittent aeration breaks the dynamic balance of constant aeration to achieve the effect of wiping the membrane, while the constant aeration ensures the cleanliness of the membrane during the period when intermittent aeration stops, thus ensuring the cleanliness of the membrane surface.

[0029] For example, the composite aeration device provided by the present invention can adjust the air replenishment time and aeration time of intermittent aeration by adjusting the air inlet flow rate of the intermittent aeration chamber, and the adjustment method is convenient and quick.

[0030] For example, the composite aeration device provided by the present invention has the same air volume when aerating simultaneously with constant and intermittent aeration as the device with constant aeration only, and the air volume when intermittent aeration stops is half of the air volume of the device with constant aeration only, thus saving air volume and reducing operating costs. Attached Figure Description

[0031] Figure 1 This is a schematic diagram of the structure of the composite aeration device in an embodiment of the present invention;

[0032] Figure 2 This is a schematic diagram of the composite aeration device from another angle in an embodiment of the present invention;

[0033] Figure 3 This is a schematic diagram of the aeration mechanism in an embodiment of the present invention;

[0034] Figure 4 This is a side view of the aeration mechanism in an embodiment of the present invention;

[0035] Figure 5 This is a bottom view of the aeration mechanism in an embodiment of the present invention;

[0036] Figure 6 This is a schematic diagram illustrating the principle of intermittent aeration achieved by the intermittent aeration pipe in an embodiment of the present invention.

[0037] Explanation of reference numerals in the attached figures:

[0038] 1. Aeration box; 11. Box frame; 12. Foot; 13. Fixing strip; 14. Fixing block; 15. Sealing plate;

[0039] 2. Aeration mechanism; 21. Aeration box body; 22. Baffle; 23. Normal aeration chamber; 24. Normal aeration pipe; 241. Normal air outlet; 242. Normal air inlet; 25. Intermittent aeration chamber; 251. Aeration hole; 26. Intermittent aeration pipe; 261. Intermittent air outlet; 262. Intermittent air inlet;

[0040] 3. Perforated air supply pipeline; 31. Air inlet pipe; 32. Aeration branch pipe; 321. Air inlet hole; 33. Circulation inner pipe. Detailed Implementation

[0041] In existing technologies, aeration devices typically employ either constant or intermittent aeration. Prolonged constant aeration can lead to a dynamic equilibrium, but the membrane elements gradually become fouled over time. Intermittent aeration, on the other hand, causes irreversible membrane fouling when all pores stop aeration and the membrane continues to draw air, making it difficult to restore membrane performance even with subsequent intermittent aeration. Simply combining mechanisms that generate constant and intermittent aeration increases equipment costs, occupies a large space, and increases gas consumption, thus raising operating costs.

[0042] To address the aforementioned technical problems, this invention provides a composite aeration device. This device optimizes the aeration mechanism, achieving a reasonable deployment of constant and intermittent aeration, reducing gas consumption and lowering operating costs without increasing equipment costs.

[0043] To make the objectives, features, and beneficial effects of the present invention more apparent and understandable, specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. It is to be understood that the specific embodiments described below are merely for explaining the present invention and are not intended to limit the present invention. Furthermore, the same or similar reference numerals may be used in the drawings to refer to the same or similar elements in different embodiments, and descriptions of the same or similar elements in different embodiments, as well as descriptions of prior art elements, features, effects, etc., may be omitted.

[0044] Figure 1 This is a schematic diagram of the structure of the composite aeration device in an embodiment of the present invention; Figure 2 This is a schematic diagram of the composite aeration device from another angle in an embodiment of the present invention; Figure 3 This is a schematic diagram of the aeration mechanism in an embodiment of the present invention; Figure 4 This is a side view of the aeration mechanism in an embodiment of the present invention; Figure 5 This is a bottom view of the aeration mechanism in an embodiment of the present invention; Figure 6 This is a schematic diagram illustrating the principle of intermittent aeration achieved by the intermittent aeration pipe in an embodiment of the present invention.

[0045] Reference Figures 1-6 This invention provides a composite aeration device.

[0046] Specifically, the composite aeration device includes:

[0047] Aeration box 1 is used to house and support aeration mechanism 2. Aeration box 1 is placed in the sewage purification tank.

[0048] Perforated air supply pipe 3 is used to supply air to aeration mechanism 2;

[0049] Aeration unit 2 is used for constant aeration and intermittent aeration. There are multiple aeration units 2, which are arranged in parallel and spaced apart in the aeration box 1, and allow water from the sewage purification tank to enter.

[0050] The aeration mechanism 2 includes a closed aeration box 21, which is equipped with multiple partitions 22. The partitions 22 divide the space inside the aeration box 21 into multiple constant aeration chambers 23 and multiple intermittent aeration chambers 25. The constant aeration chambers 23 and intermittent aeration chambers 25 are arranged alternately. The constant aeration chambers 23 are equipped with constant aeration pipes 24, and the intermittent aeration chambers 25 are equipped with intermittent aeration pipes 26. The constant aeration pipes 24 are vertically arranged straight pipes. The top of the constant aeration pipes 24 is a constant air outlet 241, and the bottom is a constant air inlet 242. The constant air outlet 241 extends out of the top of the aeration box 21 for constant aeration. The intermittent aeration pipes 26 are vertically arranged U-shaped pipes of unequal height. The higher end of the intermittent aeration pipes 26 is an intermittent air outlet 261, and the other end is an intermittent air inlet 262. The intermittent air outlet 261 extends out of the top of the aeration box 21 for intermittent aeration.

[0051] The perforated air supply line 3 is connected to the normal aeration chamber 23 and the intermittent aeration chamber 25 respectively to supply air;

[0052] When the aeration mechanism 2 is working normally, the liquid level in the constant aeration chamber 23 is lower than the air inlet of the constant aeration pipe 24, maintaining continuous aeration at a certain pressure; aeration occurs as the liquid level in the intermittent aeration chamber 25 rises from the bottom of the intermittent aeration pipe 26 to the intermittent air inlet 262, and aeration stops and replenishes air as the liquid level in the intermittent aeration chamber 25 drops from above the intermittent air inlet 262 to the bottom of the intermittent aeration pipe 26. Figure 6 As shown in the diagram, the dashed line represents the liquid level line, the upward arrow indicates the liquid level change during the aeration process, and the downward arrow indicates the liquid level change during the replenishment process.

[0053] In specific implementation, the cross-sectional area of ​​the intermittent aeration chamber 25 is S1, the height difference between the intermittent air inlet 262 of the intermittent aeration pipe 26 and the bottom of the intermittent aeration pipe 26 is H, that is, the air replenishment height is H. Therefore, the air replenishment volume of the intermittent aeration chamber 25 is V1 = S1 * H, the air inlet flow rate of the intermittent aeration chamber 25 is Q1, that is, the air replenishment flow rate is Q1, and the air replenishment time is...

[0054] The cross-sectional area of ​​the intermittent aeration pipe 26 is S2, the aeration flow rate per unit area of ​​the intermittent aeration pipe 26 is Q2, and the aeration time of the intermittent aeration pipe 26 is T2. The aeration volume of the intermittent aeration pipe 26 during the aeration time is equal to the supplementary air volume plus the intake air volume during the aeration time, which satisfies the following relationship:

[0055] S2*Q2*T2=V1+Q1*T2;

[0056] Substituting into the formula above:

[0057] S2*Q2*T2=S1*H+Q1*T2;

[0058] That is, the Qi replenishment time T1 satisfies

[0059] That is, the aeration time T2 satisfies

[0060] With the structure of the intermittent aeration pipe 26 fixed, the replenishment time T1 and aeration time T2 can be adjusted by adjusting the air inlet flow rate Q1 of the intermittent aeration chamber 25, and the aeration time T2 can also be adjusted by adjusting the aeration flow rate Q2 per unit area of ​​the intermittent aeration pipe 26.

[0061] In specific implementation, the cross-sectional area of ​​the constant aeration chamber 23 is smaller than that of the intermittent aeration chamber 25, and the diameter of the constant aeration pipe 24 is smaller than that of the intermittent aeration pipe 26. When the gas flow rate into the constant aeration chamber 23 and the intermittent aeration chamber 25 is the same, the liquid level in the constant aeration chamber 23 is maintained below the air inlet of the constant aeration pipe 24, thus achieving constant aeration. Meanwhile, the liquid level in the intermittent aeration chamber 25 cycles between rising from the bottom of the intermittent aeration pipe 26 to the intermittent air inlet 262 and falling from slightly above the intermittent air inlet 262 to the bottom of the intermittent aeration pipe 26, thus automatically achieving intermittent aeration.

[0062] In some embodiments, the intermittent air outlet 261 is 30mm-80mm higher than the top of the aeration box 21 to prevent sludge adhering to the top of the aeration box 21 from clogging the intermittent air outlet 261. The intermittent air inlet 262 is 20mm-50mm lower than the top of the aeration box 21. The distance between the intermittent air inlet 262 and the bottom of the intermittent aeration pipe 26 is 80mm-150mm to ensure the aeration duration and gas pressure during intermittent aeration, thus ensuring the impact force of intermittent aeration. The diameter of the intermittent aeration pipe 26 is 8mm-12mm, with a relatively large inner diameter, resulting in a larger bubble diameter during intermittent aeration. This allows for the sudden generation of large bubbles during intermittent aeration, and the change in air volume disrupts the balance of fouling on the membrane surface, improving the scrubbing effect of intermittent aeration.

[0063] In some embodiments, the normal air outlet 241 is 30mm-80mm higher than the top of the aeration box 21 to prevent sludge attached to the top of the aeration box 21 from clogging the normal air outlet 241. The normal air inlet 242 is 80mm-120mm lower than the top of the aeration box 21. The diameter of the normal aeration pipe 24 is 6mm-12mm to maintain a certain pressure for the normal aeration air outlet, maintain the bubble diameter of the normal aeration air, and ensure that the membrane fouling is stable at a certain level under normal aeration conditions.

[0064] In practical implementation, since it has both constant and intermittent aeration, the flow rate of constant aeration does not need to be too large to maintain a certain cleanliness of the membrane surface. When intermittent aeration stops, the amount of constant aeration is only half of the amount of aeration during constant aeration in a device with constant aeration. When constant and intermittent aeration are performed simultaneously, the amount of aeration is equal to the amount of aeration during constant aeration in a device with only constant aeration, thus saving air volume and reducing operating costs.

[0065] In some embodiments, the baffle 22 is provided with a connecting hole 221 near the bottom. The connecting hole 221 connects the normal aeration chamber 23 and the intermittent aeration chamber 25, allowing water to flow between the normal aeration chamber 23 and the intermittent aeration chamber 25, so that the overall pressure inside the normal aeration chamber 23 and the intermittent aeration chamber 25 is balanced.

[0066] In some embodiments, the sidewalls of the multiple intermittent aeration chambers 25 are provided with through aeration holes 251. The height of the aeration holes 251 is lower than the bottom of the intermittent aeration pipe 26 and higher than the height of the connecting hole 221. There are multiple aeration holes 251, and the multiple aeration holes 251 are evenly spaced.

[0067] In specific implementation, the diameter of the aeration hole 251 is 6mm-10mm. The lowest point of the aeration hole 251 is 2mm-5mm higher than the highest point of the connecting hole 221, and the highest point of the aeration hole 251 is 15mm-45mm lower than the lowest point of the intermittent aeration pipe 26. Under normal use, it is ensured that the aeration hole 251 will not aerate before the intermittent aeration pipe 26. When the intermittent outlet 261 of the intermittent aeration pipe 26 is blocked, aeration can be achieved through the aeration hole 251. The evenly spaced arrangement of multiple aeration holes 251 can more evenly aerate and scour the membrane. In addition, when the constant outlet 241 of the constant aeration pipe 24 is blocked, the gas in the constant aeration chamber 23 can enter the intermittent aeration chamber 25 through the connecting hole 221 and aerate through the intermittent aeration pipe 26 or the aeration hole 251.

[0068] In some embodiments, the top of the aeration box 21 is provided with a slope to reduce the adhesion and accumulation of sludge on the top of the aeration box 21.

[0069] In some embodiments, the perforated air supply pipeline 3 includes an air inlet pipe 31, a circulation inner pipe 33, and an aeration branch pipe 32. There are multiple aeration branch pipes 32, which are arranged in parallel. The air inlet pipe 31 and the circulation inner pipe 32 are respectively located at both ends of the multiple aeration branch pipes 32 and connected to the multiple aeration branch pipes 32. The air inlet pipe 31 is connected to an external air supply device. The air inlet pipe 31 is located on the outside of the aeration box 1, and the circulation inner pipe 33 is located on the inside of the aeration box 1.

[0070] In some embodiments, the number of aeration branch pipes 32 is the same as the number of aeration mechanisms 2. Multiple aeration branch pipes 32 are arranged one-to-one with multiple aeration mechanisms 2. Multiple air inlets 321 are provided on the aeration branch pipes 32. The air inlets 321 are arranged one-to-one with the normal aeration chamber 23 and the intermittent aeration chamber 25 to supply air to the normal aeration chamber 23 and the intermittent aeration chamber 25. The diameter of the air inlet 321 is 5mm-10mm. The annular circulation 33 connects multiple aeration branch pipes 32 to ensure that the pressure in the multiple aeration branch pipes 32 is consistent, so that the air volume of each air inlet 321 of the multiple aeration branch pipes 32 is uniform.

[0071] In some embodiments, the aeration box 1 includes a box frame 11, with fixing strips 13 and fixing blocks 14 provided on both sides of the middle part of the box frame 11. The fixing strips 13 are used to support the aeration mechanism 2, and the fixing blocks 14 are used to support the perforated air supply pipe 3. The bottom of the box frame 11 is provided with feet 12, and the box frame 11 is provided with sealing plates 15 around its perimeter.

[0072] In some embodiments, the aeration box 1 is made of stainless steel.

[0073] In summary, the composite aeration device provided by this invention has an aeration mechanism 2 with a constant aeration chamber 23 and an intermittent aeration chamber 25 spaced apart. The constant aeration chamber 23 is equipped with a vertical straight-tube constant aeration pipe 24 to achieve continuous constant aeration at a certain pressure. The intermittent aeration chamber 25 is equipped with an intermittent aeration pipe 26, which is a U-shaped pipe of unequal height. The height difference between the two ends and the bottom of the U-shaped pipe achieves intermittent aeration. Without the need to add air supply pipelines and control valves, the combination of constant and intermittent aeration is achieved. The intermittent aeration breaks the dynamic balance of constant aeration to achieve the effect of wiping the membrane, while the constant aeration ensures the cleanliness of the membrane during the period when intermittent aeration stops, thus ensuring the cleanliness of the membrane surface.

[0074] Furthermore, the composite aeration device provided by the present invention can adjust the air replenishment time and aeration time of intermittent aeration by adjusting the air inlet flow rate of the intermittent aeration chamber 25, and the adjustment method is convenient and quick.

[0075] Furthermore, the composite aeration device provided by the present invention has the same air volume when aerating simultaneously with constant and intermittent aeration as the device with constant aeration only, and the air volume when intermittent aeration stops is half of the air volume of the device with constant aeration only, thus saving air volume and reducing operating costs.

[0076] Although specific embodiments have been described above, these embodiments are not intended to limit the scope of the invention, even when only a single embodiment is described with respect to a particular feature. The feature examples provided in this disclosure are intended to be illustrative and not limiting, unless otherwise stated. In practice, one or more technical features of the dependent claims may be combined with the technical features of the independent claims as needed and where technically feasible, and may be derived from the technical features of the respective independent claims in any suitable manner rather than solely by the specific combinations listed in the claims.

[0077] While the present invention has been disclosed above, it is not limited thereto. Any person skilled in the art can make various modifications and alterations without departing from the spirit and scope of the invention; therefore, the scope of protection of the present invention should be determined by the scope defined in the claims.

Claims

1. A composite aerator characterized by, The utility model provides a sewage purification tank, which comprises an aeration tank for containing and carrying an aeration mechanism, a perforated gas supply pipeline for supplying gas to the aeration mechanism, and the aeration mechanism for aeration and intermittent aeration. The aeration mechanism comprises a closed aeration box, a plurality of partitions are arranged in the aeration box, the space in the aeration box is divided into a plurality of continuous aeration cavities and a plurality of intermittent aeration cavities by the plurality of partitions, the continuous aeration cavities and the intermittent aeration cavities are arranged in sequence and are spaced apart, a continuous aeration pipe is arranged in the continuous aeration cavity, and an intermittent aeration pipe is arranged in the intermittent aeration cavity. The continuous aeration pipe is a vertical straight pipe, the top of the continuous aeration pipe is a continuous gas outlet, the bottom of the continuous aeration pipe is a continuous gas inlet, the continuous gas outlet penetrates the top of the aeration box to perform continuous aeration, and the intermittent aeration pipe is a vertical U-shaped pipe with different heights. The high end of the intermittent aeration pipe is an intermittent gas outlet, the other end of the intermittent aeration pipe is an intermittent gas inlet, the intermittent gas outlet penetrates the top of the aeration box to perform intermittent aeration. The height of the intermittent gas outlet above the top of the aeration box is 30 mm to 80 mm, the height of the intermittent gas inlet below the top of the aeration box is 20 mm to 50 mm, and the distance between the intermittent gas inlet and the bottom of the intermittent aeration pipe is 80 mm to 150 mm. The perforated air supply pipeline respectively communicates the constant aeration chamber and the intermittent aeration chamber for air supply; when the aeration mechanism works normally, the liquid level in the constant aeration chamber is lower than the air inlet of the constant aeration pipe, thereby maintaining the continuous aeration with a certain pressure; the liquid level in the intermittent aeration chamber rises from the bottom of the intermittent aeration pipe to the intermittent air inlet, thereby aeration is carried out; the liquid level in the intermittent aeration chamber is lowered from above the intermittent air inlet to the bottom of the intermittent aeration pipe, thereby the aeration is stopped and air is supplied; the air supply time of the intermittent aeration chamber is equal to the aeration time and is calculated by the following formula: wherein, is the aeration time; is the cross-sectional area of the intermittent aeration chamber; is the height difference between the intermittent aeration pipe's intermittent air inlet and the bottom of the intermittent aeration pipe; is the air flow rate of the intermittent aeration chamber; is the aeration time; is the cross-sectional area of the intermittent aeration pipe; is the aeration flow rate per unit area of the intermittent aeration pipe.

2. The composite aerator of claim 1, wherein The diameter of the intermittent aeration pipe is 8 mm to 12 mm.

3. The composite aerator of claim 1, wherein The height of the continuous gas outlet above the top of the aeration box is 30 mm to 80 mm, the height of the continuous gas inlet below the top of the aeration box is 80 mm to 120 mm, and the diameter of the continuous aeration pipe is 6 mm to 12 mm.

4. The composite aerator of claim 1, wherein The partitions are provided with a communication hole near the bottom, and the communication hole communicates the continuous aeration cavity and the intermittent aeration cavity.

5. The composite aerator of claim 4, wherein, The side wall of each intermittent aeration cavity is provided with a plurality of aeration holes penetrating through the side wall.

6. The composite aerator of claim 1, wherein, The height of the aeration hole is lower than the bottom of the intermittent aeration pipe and higher than the height of the communication hole.

7. The composite aerator of claim 1, wherein The top of the aeration box is provided with a slope.

8. The composite aeration device of claim 7, wherein, The perforated gas supply pipeline comprises a gas inlet pipe, a circulating inner pipe, and a plurality of aeration branch pipes, the aeration branch pipes are arranged in parallel, the gas inlet pipe and the circulating inner pipe are arranged at both ends of the aeration branch pipes to connect the aeration branch pipes, the gas inlet pipe is connected to an external gas supply device, the gas inlet pipe is arranged on the outside of the aeration tank, and the circulating inner pipe is arranged on the inside of the aeration tank. The number of the aeration branch pipes is the same as the number of the aeration mechanisms, the aeration branch pipes and the aeration mechanisms are arranged one by one in a one-to-one correspondence, a plurality of gas inlet holes are arranged on the aeration branch pipes, the gas inlet holes are arranged in a one-to-one correspondence with the continuous aeration cavities and the intermittent aeration cavities to supply gas to the continuous aeration cavities and the intermittent aeration cavities.

9. The composite aeration device of claim 1, wherein, The aeration tank comprises a tank frame, fixed strips and fixed blocks arranged on both sides of the middle part of the tank frame, the fixed strips are used to bear the aeration mechanism, the fixed blocks are used to bear the perforated gas supply pipeline, the bottom of the tank frame is provided with footings, and the periphery of the tank frame is provided with sealing plates.

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