An aeration device and aeration method for use in MBBR process

Abstract

This invention relates to the field of water treatment technology and discloses an aeration device and aeration method for MBBR process. To solve the problem of limited coverage of single-pipe aeration, an aeration horizontal pipe is movably installed at the bottom of the aeration vertical pipe. The center line of the aeration horizontal pipe is perpendicular to that of the aeration vertical pipe, and multiple aeration holes are opened on the same side of the aeration horizontal pipe. When the airflow in the aeration vertical pipe is discharged through the aeration holes in the aeration horizontal pipe, the high-speed airflow discharged from the aeration holes achieves aeration. At the same time, the airflow acts on the sewage in the sedimentation tank, forcing the aeration horizontal pipe to rotate at the bottom of the aeration vertical pipe. The aeration holes provide power to force it to rotate continuously, so that the actual aeration range at the bottom of the detection cylinder is circular, and finally the effect of rotational aeration to expand the aeration range is achieved.

Description

Technical Field

[0001] This invention relates to the field of water treatment technology, and in particular to an aeration device and aeration method for use in MBBR processes. Background Technology

[0002] MBBR, or Moving Bed Biofilm Reactor, is a highly efficient biological treatment technology that is widely used in wastewater treatment.

[0003] MBBR operates on the principle of biofilm technology. A certain amount of suspended carriers (packing material) are added to the reactor, providing a surface for microorganisms to attach and grow. Under oxygenated conditions, wastewater flows through the packing material at a certain flow rate, and microorganisms form a biofilm on its surface. The microorganisms in the biofilm utilize organic matter, nitrogen, phosphorus, and other pollutants in the wastewater as nutrients for metabolic activities, converting them into harmless substances such as carbon dioxide, water, and nitrogen, thereby purifying the wastewater.

[0004] According to the search, the announcement number CN208166693U discloses an aerated biological filter, which includes an aeration pipe vertically inserted into the biological filter media layer, with a microporous aerator installed at one end of the insertion. If the microporous aerator becomes clogged, the aeration pipe can be directly pulled out and replaced with a new microporous aerator. The replacement process is simple and the maintenance cost is low.

[0005] In practical applications, the relatively limited diameter of the aeration pipes directly results in a limited aeration coverage area for a single pipe. To achieve comprehensive aeration of the biological filter media layer, the number of aeration pipes must be increased. However, an excessive number of aeration pipes not only complicates the layout of the air pipeline but also poses significant difficulties for maintenance and replacement, increasing the complexity of subsequent repairs and replacements. Summary of the Invention

[0006] This invention proposes an aeration device and aeration method for the MBBR process, which has the advantage of expanding the aeration range through rotary aeration, and is used to solve the problem of limited coverage of single-tube aeration mentioned in the background art.

[0007] To achieve the above objectives, the present invention adopts the following technical solution: an aeration device for MBBR process, comprising: a sedimentation tank, with a biological filter layer installed in the middle and an air supply pipe installed at the top, the air supply pipe being connected to an aeration vertical pipe located below the biological filter layer; a rotating base, movably installed at the bottom of the aeration vertical pipe, with an aeration horizontal pipe movably installed at the bottom of the rotating base, perpendicular to the aeration vertical pipe, and aeration holes opened on the side of the aeration horizontal pipe; the airflow in the aeration holes impacts the sewage in the sedimentation tank, causing the aeration horizontal pipe to generate torque and drive the rotating base to rotate.

[0008] Furthermore, an axial flow fan blade is movably mounted on the outer side of the aeration vertical pipe, and a traction rod is fixedly installed at the bottom of the axial flow fan blade. A pull rope is fixedly connected between the bottom of the traction rod and the aeration horizontal pipe. A detection cylinder arranged coaxially with the aeration vertical pipe is movably mounted on the outer side of the axial flow fan blade. An installation screw is movably mounted on the inner side of the detection cylinder, and the top of the installation screw is threadedly connected to the outer side of the aeration vertical pipe.

[0009] Furthermore, the detection cylinder is a cylinder with a through-hole in the middle.

[0010] Furthermore, a detection seat located above the detection cylinder is movably installed on the outside of the aeration riser, and a spring connects the top of the detection seat to the outside of the aeration riser.

[0011] Furthermore, a pressure regulating cylinder is threadedly connected to the outside of the aeration vertical pipe, and the top of the spring abuts against the bottom of the pressure regulating cylinder.

[0012] Furthermore, an alarm whistle is fixedly installed on the outside of the aeration riser, and the alarm whistle is located above the top of the detection seat.

[0013] An aeration method for an aeration device applied to an MBBR process includes the following steps:

[0014] S1. Wastewater enters from the bottom of the sedimentation tank, is purified through the biological filter layer, and is discharged from the top of the sedimentation tank.

[0015] S2. Start the air compressor and input the air source into the air supply pipe. The airflow is input into the rotating base through the aeration vertical pipe. The air in the rotating base is input into the inner cavity of the aeration horizontal pipe from the end of the aeration horizontal pipe, and finally discharged into the sewage in the sedimentation tank from the aeration hole, thus completing the aeration work.

[0016] S3. When the aeration holes spray out high-speed airflow, the airflow impacts the sewage in the sedimentation tank, forcing the aeration horizontal pipe to generate torque. The aeration horizontal pipe drives the rotating base to rotate at the bottom of the aeration vertical pipe, and the aeration horizontal pipe drives the position of the aeration holes to change, thus changing the aeration position.

[0017] The present invention has the following beneficial effects:

[0018] This invention provides an aeration device and aeration method for use in MBBR processes. An aeration horizontal pipe is movably installed at the bottom of an aeration vertical pipe, with the horizontal pipe perpendicular to the centerline of the vertical pipe. Furthermore, multiple aeration holes are evenly distributed on the same side of the horizontal pipe.

[0019] During operation, when airflow is introduced into the aeration riser, the airflow is discharged through the aeration holes on the aeration horizontal pipe. This high-speed airflow discharged from the aeration holes, while performing its aeration function, also exerts a force on the wastewater in the sedimentation tank. Due to the impact and disturbance of the airflow, the aeration horizontal pipe experiences a rotational torque at the bottom of the aeration riser, thus causing it to tend to rotate.

[0020] The airflow discharged from the aeration holes provides continuous power for the rotation of the aeration tube. Under the continuous action of the airflow, the aeration tube rotates continuously. As the aeration tube rotates, the area it covers also changes, making the actual aeration range at the bottom of the detection cylinder appear as a circular area. Through this rotational aeration method, the aeration range can be effectively expanded, enhancing the wastewater treatment effect. Attached Figure Description

[0021] The accompanying drawings, which form part of this specification, illustrate embodiments of the invention and, together with the specification, serve to explain the principles of the invention.

[0022] The invention will be more clearly understood with reference to the accompanying drawings and the following detailed description, wherein:

[0023] Figure 1 This is a schematic diagram of the overall external three-dimensional structure of the present invention;

[0024] Figure 2 This is a schematic diagram of the overall internal plan of the present invention;

[0025] Figure 3 This is a schematic diagram of the external three-dimensional structure of the aeration structure of the present invention;

[0026] Figure 4 This is a schematic diagram of the internal cross-sectional structure of the aeration structure in this invention;

[0027] Figure 5 for Figure 4 Enlarged structural diagram at point E in the middle.

[0028] In the diagram: 1. Sedimentation tank; 2. Biological filter media layer; 3. Air supply pipe; 4. Aeration vertical pipe; 5. Pressure regulating cylinder; 6. Mounting screw; 7. Detection seat; 8. Spring; 9. Detection cylinder; 10. Rotating base; 11. Aeration horizontal pipe; 110. Aeration hole; 12. Alarm whistle; 13. Axial flow fan blade; 14. Traction rod; 140. Pull rope. Detailed Implementation

[0029] 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.

[0030] Example 1, please refer to Figure 1 As can be seen, sedimentation tank 1 is mainly used to provide space for sewage storage, and a biological filter layer 2 for sewage purification is fixedly installed in the middle of sedimentation tank 1. In application, sewage is introduced from the bottom of sedimentation tank 1 through a pipe, purified by the biological filter layer 2, and then discharged outward from the top weir of sedimentation tank 1.

[0031] During use, aeration is provided to the bottom of the biological filter layer 2 to supply the microorganisms with the necessary oxygen, supporting the metabolic activities of aerobic microorganisms and promoting the degradation of organic matter and the nitrification of ammonia nitrogen. Regarding the aeration structure, from... Figure 1 and Figure 2 As can be seen, an air supply pipe 3 is fixedly installed at the top of the sedimentation tank 1, horizontally positioned above the biological filter layer 2. The end of the air supply pipe 3 is generally connected to an air compressor, with the compressor's power / frequency set at 3kW / 50Hz. This ensures the air compressor can supply a stable airflow into the air supply pipe 3. An aeration riser 4 is threadedly connected to the side of the air supply pipe 3. Multiple aeration risers 4 are arranged vertically, with their bottom ends passing through and below the biological filter layer 2. Air ejected from the bottom of the aeration riser 4 is positioned below the biological filter layer 2 to complete the aeration process.

[0032] Because the coverage area of ​​the airflow ejected from the bottom of aeration vertical pipe 4 is relatively limited, in order to increase the aeration range, from Figure 2 , Figure 4 and Figure 5 As can be seen, a rotating base 10 is movably installed at the bottom of the aeration vertical pipe 4, and the rotating base 10 can only rotate at the bottom of the aeration vertical pipe 4. Furthermore, the rotation center line of the rotating base 10 coincides with the center line of the aeration vertical pipe 4, and the inner cavity of the rotating base 10 is interconnected with the inner cavity of the aeration vertical pipe 4. The airflow in the aeration vertical pipe 4 is ultimately input into the inner cavity of the rotating base 10. An aeration horizontal pipe 11, perpendicular to the central axis of the aeration vertical pipe 4, is movably installed at the bottom of the rotating base 10, and the inner cavity of the aeration horizontal pipe 11 is interconnected with the inner cavity of the rotating base 10. More importantly, equidistantly arranged aeration holes 110 are provided on the same side of the aeration horizontal pipe 11, allowing air in the aeration horizontal pipe 11 to be released into the wastewater in the sedimentation tank 1.

[0033] In practical application, wastewater enters from the bottom of sedimentation tank 1, is purified by the biological filter layer 2, and is discharged outward from the top weir of sedimentation tank 1. At the same time, the air compressor starts and inputs a stable air source into the air supply pipe 3. The airflow is input into the rotating base 10 through the aeration vertical pipe 4. The air in the rotating base 10 is input into the inner cavity of the aeration horizontal pipe 11 from the end of the aeration horizontal pipe 11, and finally discharged into the wastewater in sedimentation tank 1 through the aeration hole 110, completing the aeration work.

[0034] Since the aeration holes 110 are located on the same side of the aeration horizontal pipe 11, when the aeration holes 110 spray high-speed airflow outward, on the one hand, air is discharged into the sewage inside the sedimentation tank 1; on the other hand, when the airflow impacts the sewage in the sedimentation tank 1, it forces the aeration horizontal pipe 11 to generate torque, causing the aeration horizontal pipe 11 to drive the rotating base 10 to rotate at the bottom of the aeration vertical pipe 4. The change in the position of the aeration holes 110 caused by the aeration horizontal pipe 11 also causes a change in the aeration position. Because the aeration horizontal pipe 11 rotates continuously, the aeration range of the aeration vertical pipe 4 is ultimately distributed in a circle.

[0035] The advantage of this arrangement is that there is no need to install other aeration risers 4 for aeration in the circular area covered by the aeration horizontal pipe 11, which reduces the use of aeration risers 4 and simplifies the layout of the air pipeline.

[0036] Example 2 is a further improvement on Example 1. Please refer to Example 1. Figure 3 and Figure 4 As can be seen, an axial flow fan blade 13 is movably mounted on the outer side of the aeration riser 4. A traction rod 14 is fixedly installed at the bottom of the axial flow fan blade 13. The traction rod 14 is movably connected to the rotating base 10. There are generally three traction rods 14, which are arranged in a ring at equal angles. On the one hand, the axial flow fan blade 13 is guided by the traction rod 14, enabling it to move up and down along the axial direction of the aeration riser 4. On the other hand, when the rotating base 10 rotates, the axial flow fan blade 13 is forced to rotate synchronously by the transmission of the traction rod 14. A pull rope 140 is fixedly connected between the bottom of the traction rod 14 and the aeration horizontal pipe 11. Since the aeration horizontal pipe 11 and the bottom of the rotating base 10 are mainly hinged, when the traction rod 14 pulls the aeration horizontal pipe 11 upward through the pull rope 140, the aeration horizontal pipe 11 and the aeration vertical pipe 4 are arranged relatively vertically. Similarly, when the traction rod 14 pushes the aeration horizontal pipe 11 downward, the bottom of the traction rod 14 abuts against the side of the aeration horizontal pipe 11, which can cause the aeration horizontal pipe 11 to deflect downward until the aeration horizontal pipe 11 and the aeration vertical pipe 4 are both arranged vertically.

[0037] Meanwhile, a detection cylinder 9, coaxially arranged with the aeration vertical pipe 4, is movably installed on the outer side of the axial flow fan blade 13. The axial flow fan blade 13 can not only rotate relative to the detection cylinder 9 inside, but the detection cylinder 9 can also move up and down synchronously with the axial flow fan blade 13. Combined with... Figure 3 and Figure 4 It can be seen that an installation screw 6 is movably installed inside the detection cylinder 9, and the top of the installation screw 6 is threadedly connected to the outer side of the aeration vertical pipe 4. Based on the handle fixedly installed on the top of the installation screw 6, the installation screw 6 can rotate and move up and down along the axial direction of the aeration vertical pipe 4. Generally speaking, when the installation screw 6 is screwed in to the upper limit, the installation screw 6 pulls the detection cylinder 9 upward. The detection cylinder 9 pulls the aeration horizontal pipe 11 upward synchronously according to the axial flow fan blade 13, the traction rod 14 and the pull rope 140 until the side of the aeration horizontal pipe 11 touches the bottom of the rotating base 10. At this time, the aeration horizontal pipe 11 and the aeration vertical pipe 4 are relatively perpendicular. Similarly, when the installation screw 6 is screwed in in the opposite direction and moves downward, the traction rod 14 finally touches the side of the aeration horizontal pipe 11, and the aeration horizontal pipe 11 deflects downward until it is relatively vertically arranged with the aeration vertical pipe 4. The advantage of this design is that, by manually controlling the deflection of the aeration horizontal pipe 11, the aeration horizontal pipe 11 and the aeration vertical pipe 4 are both in a vertical state during installation, making it easier to pass through the biological filter layer 2; when the aeration horizontal pipe 11 is working, the operator adjusts the installation screw 6 to pull the detection cylinder 9 upward until the aeration horizontal pipe 11 and the aeration vertical pipe 4 are arranged relatively perpendicularly.

[0038] After prolonged use, the aeration holes 110 may become clogged, preventing proper airflow. Figure 4 and Figure 5 It can be seen that a detection seat 7 is movably installed on the outside of the aeration vertical pipe 4, located above the detection cylinder 9. Since the detection cylinder 9 is a cylinder with a through-center, when the detection seat 7 is pressed against the top of the detection cylinder 9, it can relatively close the top opening of the detection cylinder 9. Furthermore, a spring 8 is connected between the top of the detection seat 7 and the outside of the aeration vertical pipe 4. Pushed by the elastic force of the spring 8, the detection seat 7 ensures that the top opening of the detection cylinder 9 is always blocked under normal conditions. From the above working content, it can be seen that when the aeration horizontal pipe 11 is working, it will cause the rotating base 10 to rotate rapidly. When the detection seat 7 blocks the top of the detection cylinder 9, when the aeration horizontal pipe 11 drives the rotating base 10 to rotate rapidly, the rotation of the axial flow fan blade 13 will cause the sewage in the sedimentation tank 1 to enter the inner cavity of the detection cylinder 9. As the sewage in the inner cavity of the detection cylinder 9 increases, it will push the detection seat 7 upward to compress the spring 8, and the spring 8 will store force under pressure. Since the detection seat 7 needs to overcome the stored force resistance of the spring 8 when it moves upward, this is equivalent to a relative increase in the load when the axial flow fan blade 13 delivers water to the detection cylinder 9. Because the airflow pressure input into the aeration horizontal pipe 11 is relatively constant, the airflow intensity discharged from the aeration holes 110 is also relatively constant. Ultimately, the torque actually generated by the rotating base 10 is relatively constant. The operator only needs to adjust the load intensity generated by the detection seat 7 to control the movement speed of the rotating base 10 within a certain range. For more details, see... Figure 4It can be seen that the outer side of the aeration vertical pipe 4 is threaded with a pressure regulating cylinder 5, and the top of the spring 8 abuts against the bottom of the pressure regulating cylinder 5. By rotating the pressure regulating cylinder 5, the downward pressing strength of the spring 8 can be adjusted, which can also adjust the upward load strength of the detection seat 7. Finally, by adjusting the load strength of the axial flow fan blade 13, the actual rotation speed of the rotating base 10 can be affected.

[0039] from Figure 3 and Figure 4 It can be seen that an alarm whistle 12 is fixedly installed on the outside of the aeration riser 4. The alarm whistle 12 is located above the top of the detection seat 7. Under normal conditions, when the detection seat 7 blocks the top of the detection cylinder 9, the aeration riser 4 is connected to the outside through the alarm whistle 12, allowing the airflow in the inner cavity of the aeration riser 4 to be discharged through the alarm whistle 12, and the alarm whistle 12 can emit a sound. When the sewage in the detection cylinder 9 increases, causing the detection seat 7 to be pushed upward, the detection seat 7 can block the alarm whistle 12, thereby preventing it from emitting a sound. It can be seen that whether the detection seat 7 can move upward depends on whether the axial flow fan blade 13 injects sewage medium into the inner cavity of the detection cylinder 9. If the aeration hole 110 normally discharges airflow, the aeration horizontal pipe 11 can drive the rotating base 10 to drive the axial flow fan blade 13 to rotate; conversely, if the aeration hole 110 is blocked, the rotating base 10 will not rotate. By using whether the alarm whistle 12 sounds, it is possible to accurately determine whether the aeration hole 110 is working.

[0040] In practical application: When installation is required, the mounting screw 6 is turned downwards, causing the detection cylinder 9 to drive the axial flow fan blade 13 downwards. The axial flow fan blade 13, via the traction rod 14, abuts against the side of the aeration horizontal pipe 11, ensuring that both the aeration horizontal pipe 11 and the aeration vertical pipe 4 are arranged relatively vertically. After the aeration horizontal pipe 11 and the aeration vertical pipe 4 pass through the biological filter layer 2, the top of the aeration vertical pipe 4 is threadedly connected to the air supply pipe 3. Then, the mounting screw 6 is turned upwards, causing the detection cylinder 9 to pull the aeration horizontal pipe 11 upwards via the axial flow fan blade 13, the traction rod 14, and the pull rope 140, until the aeration horizontal pipe 11 and the aeration vertical pipe 4 are relatively perpendicular. The detection seat 7 is pushed downwards by the spring force of the spring 8, sealing the top of the detection cylinder 9. The detection seat 7 is located below the alarm whistle 12.

[0041] During normal operation, the air compressor supplies airflow to the rotating base 10 through the air supply pipe 3 and the aeration vertical pipe 4. The airflow passes through the inner cavity of the rotating base 10 and the aeration horizontal pipe 11 and is quickly discharged from the aeration hole 110. When the airflow discharged from the aeration hole 110 impacts the sewage, it causes the aeration horizontal pipe 11 to drive the rotating base 10 to rotate. The rotating base 10 drives the axial flow fan blade 13 to rotate synchronously and quickly through the traction rod 14. The rotating axial flow fan blade 13 continuously injects sewage from the sedimentation tank 1 into the detection cylinder 9. As the sewage in the detection cylinder 9 increases, it pushes the detection seat 7 upward to compress the spring 8. The load provided by the spring force of the spring 8 increases the rotational resistance of the axial flow fan blade 13, thereby preventing the rotating base 10 from rotating too fast. At the same time, when the detection seat 7 moves upward, the inner side will block the alarm whistle 12, ensuring that the alarm whistle 12 will not sound when the aeration horizontal pipe 11 is working normally.

[0042] When the aeration hole 110 becomes blocked, the airflow in the aeration horizontal pipe 11 cannot be discharged normally from the aeration hole 110. Without airflow from the aeration hole 110, the aeration horizontal pipe 11 cannot drive the rotating base 10 to rotate, and the axial flow fan blade 13 will no longer input sewage into the inner cavity of the detection cylinder 9. The detection seat 7 moves down under the force of the spring 8 and reaches the top of the detection cylinder 9. The detection seat 7 no longer blocks the alarm whistle 12, and the airflow in the aeration vertical pipe 4 flows out from the alarm whistle 12, and the alarm whistle 12 sounds.

[0043] Finally, the operator can disassemble and repair the malfunctioning aeration riser 4 by using the sound source. For disassembly, refer to the installation method described above: first, ensure both the horizontal aeration pipe 11 and the vertical aeration pipe 4 are in a vertical position, then disconnect the vertical aeration pipe 4 from the air supply pipe 3.

Claims

1. An aeration device for use in MBBR process, characterized in that, include: The sedimentation tank (1) has a biological filter layer (2) installed in the middle and an air supply pipe (3) installed at the top. The side of the air supply pipe (3) is connected to an aeration vertical pipe (4) located below the biological filter layer (2). A rotating base (10) is movably installed at the bottom of the aeration vertical pipe (4). An aeration horizontal pipe (11) perpendicular to the aeration vertical pipe (4) is movably installed at the bottom of the rotating base (10). An aeration hole (110) is opened on the side of the aeration horizontal pipe (11). The airflow in the aeration hole (110) impacts the sewage in the sedimentation tank (1), which can generate torque in the aeration pipe (11) and drive the rotating base (10) to rotate. An axial flow fan blade (13) is movably fitted on the outside of the aeration vertical pipe (4). A traction rod (14) is fixedly installed at the bottom of the axial flow fan blade (13). A pull rope (140) is fixedly connected between the bottom of the traction rod (14) and the aeration horizontal pipe (11). An inspection cylinder (9) is movably installed on the outer side of the axial flow fan blade (13) and is arranged coaxially with the aeration vertical pipe (4). An installation screw (6) is movably installed on the inner side of the inspection cylinder (9), and the top of the installation screw (6) is threadedly connected to the outer side of the aeration vertical pipe (4). A detection seat (7) located above the detection cylinder (9) is movably installed on the outside of the aeration riser (4). A spring (8) is connected between the top of the detection seat (7) and the outside of the aeration riser (4). The aeration vertical pipe (4) is threadedly connected to a pressure regulating cylinder (5), and the top of the spring (8) abuts against the bottom of the pressure regulating cylinder (5); An alarm whistle (12) is fixedly installed on the outside of the aeration riser (4), and the alarm whistle (12) is located above the top of the detection seat (7).

2. The aeration device for the MBBR process according to claim 1, characterized in that, The detection cylinder (9) is a cylinder with a through-hole in the middle.

3. An aeration method for an aeration device applied to an MBBR process as described in claim 1, characterized in that, Includes the following steps: S1. Wastewater is input from the bottom of the sedimentation tank (1), purified through the biological filter layer (2), and discharged from the top of the sedimentation tank (1). S2. Start the air compressor and input the air source into the air supply pipe (3). The airflow is input into the rotating base (10) through the aeration vertical pipe (4). The air in the rotating base (10) is input into the inner cavity of the aeration horizontal pipe (11) from the end of the aeration horizontal pipe (11), and finally discharged from the aeration hole (110) into the sewage in the sedimentation tank (1) to complete the aeration work. S3. When the aeration hole (110) sprays out a high-speed airflow, the airflow impacts the sewage in the sedimentation tank (1), forcing the aeration horizontal pipe (11) to generate torque. The aeration horizontal pipe (11) drives the rotating base (10) to rotate at the bottom of the aeration vertical pipe (4). The aeration horizontal pipe (11) drives the aeration hole (110) to change position, causing the aeration position to change.

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