An intermittent aeration device at the end of an aerobic tank

Abstract

This application discloses an intermittent aeration device at the end of an aerobic tank, relating to the field of wastewater treatment. It includes a blower, an air storage bladder, and an aerator. The blower is equipped with a first connecting pipe, the air storage bladder with a second connecting pipe communicating with the first connecting pipe, and the aerator with a third connecting pipe communicating with the first connecting pipe. A control valve is installed on the third connecting pipe to control the flow of gas from the air storage bladder into the aerator. This application reduces the impact of aeration on sedimentation at the end of the aerobic tank and denitrification at the beginning, thereby improving wastewater treatment efficiency.

Description

Technical Field

[0001] This application relates to the field of wastewater treatment, and in particular to an aerobic tank end-gap aeration device. Background Technology

[0002] Currently, aerobic treatment is a widely used process in wastewater treatment. In an aerobic tank, aerobic microorganisms utilize organic matter for synthesis and metabolism in an environment with sufficient dissolved oxygen, thereby degrading pollutants and converting organic nitrogen and ammonia nitrogen into nitrate nitrogen. The main equipment in an aerobic tank is the aerator, which not only provides oxygen but also agitates the water, ensuring that the microorganisms are in suspension and thus increasing their contact with pollutants.

[0003] In existing technologies, wastewater flows into the front of an aerobic tank and flows out or is returned after treatment. Because the pollution concentration is low at the end of the aerobic tank, the oxygen consumption is relatively small. Continuous aeration leads to a continuous increase in dissolved oxygen concentration, affecting sedimentation at the back end and denitrification at the front. However, reducing the aeration rate affects the mixing effect between microorganisms and wastewater. Therefore, the inventors provide an intermittent aeration device at the end of an aerobic tank. Summary of the Invention

[0004] In order to reduce the impact of aeration on sedimentation at the end of the aerobic tank and denitrification reaction at the beginning, and to improve the wastewater treatment effect, this application provides an intermittent aeration device at the end of the aerobic tank.

[0005] The technical solution of the aerobic tank end-gap aeration device provided in this application is as follows:

[0006] The device includes a blower, an air storage bladder, and an aerator. The blower is equipped with a first connecting pipe, the air storage bladder is equipped with a second connecting pipe that communicates with the first connecting pipe, and the aerator is equipped with a third connecting pipe that communicates with the first connecting pipe. The third connecting pipe is equipped with a control valve, which is used to control the gas in the air storage bladder to enter the aerator.

[0007] By adopting the above technical solution, during use, turning on the blower provides sufficient air pressure to the air storage bladder. When the pressure reaches a certain value, the control valve pushes the gas in the air storage bladder out of the aerator to form intermittent aeration. Adjusting the intermittent aeration frequency and aeration volume reduces the dissolved oxygen concentration at the end of the aerobic tank and achieves a stirring effect, keeping the microorganisms in the aerobic tank in a suspended state. This reduces the impact of aeration on sedimentation at the end of the aerobic tank and denitrification reaction at the front end, thereby improving the wastewater treatment effect.

[0008] Preferably, a pressure controller is provided on the first connecting pipe, the pressure controller is electrically connected to the fan, and the pressure controller controls the fan to stop when the pressure of the air storage bag is high.

[0009] By adopting the above technical solution, during use, when the pressure of the air bladder reaches the set value, the pressure controller stops the fan, thereby preventing the air bladder from being too high and improving the convenience of using the air bladder.

[0010] Preferably, the control valve is connected to two ends by a connecting pipe, and a safety valve is installed on the connecting pipe. The safety valve automatically opens to release pressure when the pressure is too high.

[0011] By adopting the above technical solution, when the pressure of the air storage bladder is too high during use, the pressure can be released through the safety valve, allowing the air to be directly discharged from the aerator. The aeration device is designed with dual pressure protection measures of pressure controller and safety valve to prevent overpressure in the pipeline due to failure of the self-operated valve pre-control pneumatic valve, thus ensuring the safe and stable operation of the device.

[0012] Preferably, the air storage bladder is provided with a separator membrane, and a compression chamber and an inflation chamber are formed on both sides of the separator membrane. The compression chamber is connected to the blower. The air storage bladder is provided with a three-way valve connected to the inflation chamber. One end of the three-way valve is provided with a pressure transformer, and the other end of the three-way valve is used to inject inert gas.

[0013] By adopting the above technical solution, during use, the pressure is detected by the pressure surface, and air is injected into the air storage bladder by the air dispenser. This allows for adjustment of the compressed air volume and thus the frequency of intermittent aeration, improving the convenience of using the aeration device.

[0014] Preferably, the aerator is provided with multiple stirring plates, and the sidewalls of the stirring plates are provided with involute slopes. The aerator sprays air and it flows along the involute slopes.

[0015] By adopting the above technical solution, the mixing plate can agitate the sewage with airflow, thereby increasing the impact force of aeration and mixing, and thus improving the sewage mixing effect.

[0016] Preferably, two air reservoirs are provided. The control valve is simultaneously connected to a first connecting pipe, two second connecting pipes, and a third connecting pipe. The two second connecting pipes are respectively located between the first and third connecting pipes. A switching chamber is provided inside the control valve. The first, second, and third connecting pipes are all connected to the switching chamber. A rotating valve plate is provided inside the switching chamber. The rotating valve plate is composed of three control valve blocks that abut against the side wall of the switching chamber. An electric controller for driving the rotating valve plate to rotate is provided on the control valve. When the rotating valve plate is rotated, in the first state, the first second connecting pipe is connected to the first connecting pipe, and the second second connecting pipe and the third connecting pipe are both closed; in the second state, when the first second connecting pipe and the third connecting pipe are connected, the second second connecting pipe is connected to the first connecting pipe; in the third state, the first connecting pipe and the second second connecting pipe are connected, and the first second connecting pipe and the third connecting pipe are both closed.

[0017] By adopting the above technical solution, during use, in the first state, the first second connecting pipe is connected to the first connecting pipe, and the second second connecting pipe and the third connecting pipe are both closed; in the second state, when the first second connecting pipe and the third connecting pipe are connected, the second second connecting pipe is connected to the first connecting pipe; in the third state, the first connecting pipe and the second second connecting pipe are connected, and the first second connecting pipe and the third connecting pipe are both closed; in all three states, the first connecting pipe inflates the two air storage bags respectively, thereby making it more convenient and stable to inflate the air storage bags. Furthermore, during aeration, a quantitative aeration can be performed through the air storage bags, allowing a fixed amount of gas to be injected into the wastewater, better regulating the amount of oxygen injected into the wastewater, reducing the impact of aeration on sedimentation at the end of the aerobic tank and denitrification at the front end, and improving the wastewater treatment effect.

[0018] Preferably, the outer wall of the rotary valve plate is provided with a plurality of sealing plates, which abut against the inner wall of the switching cavity.

[0019] By adopting the above technical solution, the use of sealing plates can make the rotary valve plate rotate more tightly, thereby reducing air leakage and improving the stability of the control valve.

[0020] Preferably, the control valve block near the third connecting pipe has drainage chamfers on both sides, and the two drainage chamfers form micro-leaking cavities with the two second connecting pipes respectively.

[0021] By adopting the above technical solution, during use, when the control valve block rotates to the second connecting pipe, the gas in the air storage bag can be slightly discharged, thereby preventing damage to the internal pipeline caused by excessive pressure and ensuring the stability of the aeration device.

[0022] Preferably, the drainage chamfer has an installation groove, and a soft sealing strip is snapped into the installation groove.

[0023] By adopting the above technical solution, during use, when the control valve block rotates to the second connecting pipe, the soft sealing strip can be pushed away from the second connecting pipe under the action of compressed gas, so that the gas can flow more stably and reduce the erosion of the rotating valve plate by the high-pressure airflow. When the control valve block moves away from the second connecting pipe, the soft sealing strip can be pressed against the inner wall of the switching cavity under the action of air pressure, thereby improving the sealing performance of the rotating valve plate.

[0024] Preferably, one end of the three-way valve is slidably connected to a sliding valve seat, the sliding valve seat has a first chamber communicating with the three-way valve, the sliding valve seat has an air injection pipe, the opening of the three-way valve is provided with a one-way valve seat, the one-way valve seat has a second chamber, a one-way valve block is slidably disposed in the second chamber, when the one-way valve block approaches the control valve block, the control valve block protrudes from the one-way valve seat, and the one-way valve block closes the second chamber.

[0025] By adopting the above technical solution, during use, the inert gas can be switched on and off via the one-way valve block. When inert gas is injected, the one-way valve block is pushed away from the sliding valve seat under the action of air pressure, thereby injecting inert gas. When pressure relief is required, the operator pushes the sliding valve seat, which in turn pushes the one-way valve block to move, thereby achieving the purpose of pressure relief and improving the convenience of controlling the inflation chamber inside the gas storage bag.

[0026] In summary, this application includes at least one of the following beneficial technical effects:

[0027] 1. Turn on the blower to provide sufficient air pressure to the air storage bladder. When the pressure reaches a certain value, the gas in the air storage bladder is pushed out by the aerator through the control valve to form intermittent aeration. Adjust the intermittent aeration frequency and aeration volume to reduce the dissolved oxygen concentration at the end of the aerobic tank and achieve a stirring effect. This keeps the microorganisms in the aerobic tank in a suspended state, reduces the impact of aeration on the sedimentation at the end of the aerobic tank and the denitrification reaction at the front end, and improves the wastewater treatment effect.

[0028] 2. During use, the pressure is detected by the pressure surface, and air is injected into the air storage bag by the air dispenser. This allows the compressed air volume to be adjusted, thereby adjusting the frequency of intermittent aeration and improving the convenience of using the aeration device.

[0029] 3. During use, the inert gas can be switched on and off via the one-way valve block. When inert gas is injected, the pressure pushes the one-way valve block away from the sliding valve seat, thus allowing the inert gas to be injected. When pressure relief is required, the operator pushes the sliding valve seat, which in turn moves the one-way valve block, thereby achieving the purpose of pressure relief and improving the convenience of controlling the inflation chamber inside the gas storage bag. Attached Figure Description

[0030] Figure 1 This is a schematic diagram of the overall structure of an aerobic tank end-gap aeration device according to Embodiment 1 of this application;

[0031] Figure 2 This is a schematic diagram illustrating the aerator structure, as shown in Embodiment 1 of this application.

[0032] Figure 3 This is a schematic diagram of the overall structure of an aerobic tank end-gap aeration device according to Embodiment 2 of this application;

[0033] Figure 4 This is a schematic diagram illustrating the first state of the control valve in Embodiment 2 of this application;

[0034] Figure 5 This is a schematic diagram illustrating the second state of the control valve in Embodiment 2 of this application;

[0035] Figure 6 This is a schematic diagram illustrating the third state of the control valve in Embodiment 2 of this application;

[0036] Figure 7 This is a schematic diagram illustrating the structure of the three-way valve, as shown in Embodiment 2 of this application.

[0037] Reference numerals: 1. Three-way valve; 2. Inflation chamber; 3. Separating membrane; 4. Compression chamber; 5. Second connecting pipe; 6. Safety valve; 7. Control valve; 8. Third connecting pipe; 9. First connecting pipe; 10. Blower; 11. Pressure controller; 12. Air reservoir; 13. Pressure gauge; 14. Aerator; 15. Stirring plate; 16. Involute slope; 17. Connecting chamber; 18. Rotating valve plate; 19. Soft sealing strip; 20. Switching chamber; 21. Sliding valve seat; 22. One-way valve seat; 23. Second chamber; 24. Air injection pipe; 25. One-way valve block; 26. Blocking block; 27. Electric controller; 28. Sealing plate; 29. ​​Drainage chamfer. Detailed Implementation

[0038] The following is in conjunction with the appendix Figure 1 - Figure 7 This application will be described in further detail.

[0039] This application discloses an end-gap aeration device for an aerobic tank.

[0040] Example 1

[0041] Reference Figure 1 An intermittent aeration device at the end of an aerobic tank includes a blower 10, an air storage bladder 12, and an aerator 14. A first connecting pipe 9 is connected to the blower 10. A second connecting pipe 5, communicating with the first connecting pipe 9, is installed on the air storage bladder 12. A third connecting pipe 8, communicating with the first connecting pipe 9, is installed on the aerator 14. The first connecting pipe 9, the second connecting pipe 5, and the third connecting pipe 8 are interconnected, allowing gas flow. A control valve 7, a ball valve, is installed on the third connecting pipe 8. The control valve 7 controls the flow of gas from the air storage bladder 12 into the aerator 14. By adjusting the intermittent aeration frequency and aeration rate, the dissolved oxygen concentration at the end of the aerobic tank is reduced, achieving a stirring effect and keeping the microorganisms in the aerobic tank in suspension.

[0042] A pressure controller 11 is installed on the first connecting pipe 9. The pressure controller 11 is electrically connected to the blower 10. When the pressure in the air storage bladder 12 is high, the pressure controller 11 controls the blower 10 to stop rotating. This stops pressurization, ensuring both the pressure in the air storage bladder 12 and the safety of the aeration device.

[0043] The control valve 7 is connected to a connecting pipe at both ends, and a safety valve 6 is installed on the connecting pipe. The safety valve 6 automatically releases pressure when the pressure is too high. By releasing pressure through the safety valve 6, air can be directly discharged from the aerator 14. The aeration device is designed with dual pressure protection measures, namely the pressure controller 11 and the safety valve 6, to prevent overpressure in the pipeline in case of failure of the self-operated pneumatic valve before the valve, thus ensuring the safe and stable operation of the device.

[0044] An air reservoir 12 contains a separator membrane 3. Compression chambers 4 and inflation chambers 2 are formed on both sides of the separator membrane 3. The compression chambers 4 are connected to the blower 10. A three-way valve 1 connected to the inflation chamber 2 is installed on the air reservoir 12. A pressure gauge 13 is installed at one end of the three-way valve 1, and the other end is used to inject inert gas. Adjusting the compressed air volume of the air reservoir 12 controls the aeration rate each time, improving the stability of air aeration.

[0045] Multiple mixing plates 15 are fixed on the aerator 14. The side wall of the mixing plate 15 is provided with an involute slope 16. The mixing plate 15 is duckbill shaped. The aerator 14 sprays air and flows along the involute slope 16, so that the airflow can flow to both sides to achieve the purpose of mixing sewage.

[0046] The implementation principle of the intermittent aeration device at the end of an aerobic tank according to this application embodiment is as follows: After the compressed air pressure in the air storage bladder 12 reaches a certain value, the self-regulating pressure-controlled pneumatic valve before the valve opens, and the compressed air is released into the aerobic tank through the aerator 14. The activated sludge in the aerobic tank is oxygenated and agitated by air, thus suspending in the water. After the compressed air is released, the pipeline pressure drops, the self-regulating pressure-controlled pneumatic valve before the valve automatically closes, and the air storage bladder 12 continues to inflate. This inflating and releasing cycle forms an intermittent aeration pattern. When the compressed air pressure exceeds the set value of the safety valve 6, the safety valve 6 automatically opens to relieve pressure. When the compressed air pressure exceeds the set pressure of the pressure controller 11, the pressure controller 11 sends a signal to the blower 10 to reduce pressure or stop. The air storage bladder 12 is inflated through the three-way valve 1 to adjust the compressed air volume of the air storage bladder 12, thereby adjusting the frequency of intermittent aeration.

[0047] Example 2

[0048] Reference Figure 3 The difference between this embodiment and Embodiment 1 is that two air storage bladders 12 are provided, each supplying air to the aerator 14. The control valve 7 is simultaneously connected to the first connecting pipe 9, the second connecting pipe 5, and the third connecting pipe 8. Two second connecting pipes 5 are respectively installed between the first connecting pipe 9 and the third connecting pipe 8. A switching chamber 20 is provided within the control valve 7, which is simultaneously connected to the first connecting pipe, the second connecting pipe 5, and the third connecting pipe 8. The switching chamber 20 is cylindrical, and two communicating cavities 17 are formed on its side wall, located between the first connecting pipe 9 and the two second connecting pipes 5, respectively, providing space for airflow. A rotating valve plate 18 is rotatably connected within the switching chamber 20. The rotating valve plate 18 consists of three rotating valve blocks, and an electric controller 27 is installed on the control valve 7 to drive the rotation of the rotating valve plate 18. Rotating the control valve 7 results in three states: First, the first second connecting pipe 5 is connected to the first connecting pipe 9, while the second second connecting pipe 5 and the third connecting pipe 8 are both closed, allowing the first air reservoir 12 to inflate; Second, when the first second connecting pipe 5 and the third connecting pipe 8 are connected, the second second connecting pipe 5 is connected to the first connecting pipe 9 through the connecting cavity 17; Third, when the first connecting pipe 9 and the second second connecting pipe 5 are connected, both the first second connecting pipe 5 and the third connecting pipe 8 are closed.

[0049] A sealing sheet 28 is fixed to the outer wall of the rotary valve plate 18. The sealing sheet 28 is made of rubber material and abuts against the inner wall of the switch chamber 20. Drainage chamfers 29 are provided on both sides of the control valve block near the third connecting pipe 8. The two drainage chamfers 29 form micro-vent cavities with the two second connecting pipes 5 respectively, so that the gas in the air storage bag 12 can be slightly discharged.

[0050] An installation groove is provided on the chamfer 29. The installation groove is a T-shaped groove, and a soft sealing strip 19 is snapped onto the installation groove. When the control valve block rotates to the second connecting pipe 5, under the action of pressurized gas, the soft sealing strip 19 can be pushed away from the second connecting pipe 5, so that the gas can flow more stably and reduce the erosion of the high-pressure airflow greater than the rotating valve plate 18. When the control valve block moves away from the second connecting pipe 5, under the action of air pressure, the soft sealing strip 19 can press against the inner wall of the switching cavity 20, improving the sealing performance of the rotating valve plate 18.

[0051] A sliding valve seat 21 is slidably connected to one end of a three-way valve 1. The sliding valve seat 21 and the three-way valve 1 slide in a sealed manner. The sliding valve seat 21 is concave and has a first chamber that communicates with the three-way valve 1. The first chamber is cylindrical. An air injection pipe 24 that communicates with the first chamber is provided on the sliding valve seat 21. A one-way valve seat 22 is installed at the opening of the three-way valve 1. A second chamber 23 is provided in the one-way valve seat 22. The inner diameter of the second chamber 23 gradually decreases in the direction away from the three-way valve 1. Multiple blocking blocks 26 are integrally formed on the side wall of the second chamber 23. A one-way valve block 25 is slidably installed in the second chamber 23. When the one-way valve block 25 is close to the control valve block, it blocks the gas flow. The control valve block protrudes from the one-way valve seat 22. The one-way valve block 25 is used to close the second chamber 23. Thus, when the sliding valve seat 21 moves, the one-way valve block 25 can be opened to allow air to flow. When inert gas is injected, the gas pressure pushes the one-way valve block 25 away from the sliding valve seat 21, thereby allowing the inert gas to be injected. When pressure relief is required, the operator pushes the sliding valve seat 21, which in turn moves the one-way valve block 25, thus achieving the purpose of pressure relief.

[0052] The implementation principle of Example 2 is as follows: Under the three states, the first connecting pipe 9 inflates the two air storage bags 12 respectively, so that the air storage bags 12 can be inflated more conveniently and stably. During aeration, a fixed amount of gas can be injected into the sewage through the air storage bags 12, so as to better regulate the amount of oxygen injected into the sewage, reduce the impact of aeration on the sedimentation at the end of the aerobic tank and the denitrification reaction at the front end, and improve the sewage treatment effect.

[0053] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. An intermittent aeration device at the end of an aerobic tank, characterized in that: The device includes a blower (10), an air storage bladder (12), and an aerator (14). The blower (10) is provided with a first connecting pipe (9), the air storage bladder (12) is provided with a second connecting pipe (5) connected to the first connecting pipe (9), and the aerator (14) is provided with a third connecting pipe (8) connected to the first connecting pipe (9). The third connecting pipe (8) is provided with a control valve (7), which is used to control the gas in the air storage bladder (12) to enter the aerator (14). Two air reservoirs (12) are provided. The control valve (7) is simultaneously connected to a first connecting pipe (9), two second connecting pipes (5), and a third connecting pipe (8). The two second connecting pipes (5) are respectively located between the first connecting pipe (9) and the third connecting pipe (8). A switching chamber (20) is provided inside the control valve (7). The first connecting pipe (9), the second connecting pipe (5), and the third connecting pipe (8) are all connected to the switching chamber (20). A rotating valve plate (18) is provided inside the switching chamber (20). The rotating valve plate (18) is composed of three control valve blocks that abut against the side wall of the switching chamber (20). The valve (7) is equipped with an electric controller (27) for driving the rotating valve plate (18) to rotate. When the rotating valve plate (18) is rotated, in the first state, the first second connecting pipe (5) is connected to the first connecting pipe (9), and the second second connecting pipe (5) and the third connecting pipe (8) are both closed; in the second state, when the first second connecting pipe (5) and the third connecting pipe (8) are connected, the second second connecting pipe (5) is connected to the first connecting pipe (9); in the third state, the first connecting pipe (9) and the second second connecting pipe (5) are connected, and the first second connecting pipe (5) and the third connecting pipe (8) are both closed. The outer wall of the rotary valve plate (18) is provided with a plurality of sealing plates (28), and the sealing plates (28) abut against the inner wall of the switching cavity (20); Drainage chamfers (29) are provided on both sides of the control valve block near the third connecting pipe (8), and the two drainage chamfers (29) form micro-leakage cavities with the two second connecting pipes (5) respectively; An installation groove is provided on the drainage chamfer (29), and a soft sealing strip (19) is snapped into the installation groove.

2. The aerobic tank end-interval aeration device according to claim 1, characterized in that: A pressure controller (11) is provided on the first connecting pipe (9). The pressure controller (11) is electrically connected to the fan (10). When the pressure of the air storage bag (12) is large, the pressure controller (11) controls the fan (10) to stop.

3. The aerobic tank end-interval aeration device according to claim 2, characterized in that: The control valve (7) is connected to a connecting pipe at both ends, and a safety valve (6) is installed on the connecting pipe. The safety valve (6) automatically opens to release pressure when the pressure is high.

4. The aerobic tank end-interval aeration device according to claim 3, characterized in that: The gas storage bladder (12) is provided with a separator membrane (3), and a compression chamber (4) and an inflation chamber (2) are formed on both sides of the separator membrane (3). The compression chamber (4) is connected to the blower (10). The gas storage bladder (12) is provided with a three-way valve (1) connected to the inflation chamber (2). One end of the three-way valve (1) is provided with a pressure transformer, and the other end of the three-way valve (1) is used to inject inert gas.

5. The aerobic tank end-interval aeration device according to claim 1, characterized in that: The aerator (14) is provided with multiple stirring plates (15), and the side wall of the stirring plate (15) is provided with an involute slope (16). The aerator (14) sprays out air and flows along the involute slope (16).

6. The aerobic tank end-interval aeration device according to claim 4, characterized in that: The three-way valve (1) is slidably connected to a sliding valve seat (21) at one end. The sliding valve seat (21) has a first chamber that communicates with the three-way valve (1). An air injection pipe (24) is provided on the sliding valve seat (21). A one-way valve seat (22) is provided at the opening of the three-way valve (1). A second chamber (23) is provided in the one-way valve seat (22). A one-way valve block (25) is slidably arranged in the second chamber (23). When the one-way valve block (25) is close to the control valve block, the control valve block protrudes from the one-way valve seat (22), and the one-way valve block (25) closes the second chamber (23).

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