Self-adjusting aeration quantity microbial aeration tank for sewage treatment

Abstract

The application discloses a self-adjusting aeration quantity microbial aeration tank for sewage treatment, and relates to the technical field of sewage treatment aeration tanks, which comprises an aeration tank, an aeration mechanism, a detection mechanism and a control module; the aeration mechanism is arranged in the aeration tank and is used for aerating water in the aeration tank; the detection mechanism is arranged in the aeration tank and is used for dynamically detecting DO of the water in the aeration tank and performing online settlement analysis; the control module comprehensively judges the activity of microorganisms according to the data detected by the detection mechanism; the water pump, the water inlet pipe, the water outlet pipe, the extension pipe and the plurality of DO detection modules are arranged, so that the mixed solution in the aeration tank can be dynamically detected in a relatively stable flowing environment, and the oxygen consumption rate per unit time can be calculated according to the DO change at a plurality of positions; the application has the characteristics that the dynamic detection of DO and the online analysis of sludge settlement can be simultaneously realized during the continuous operation of the aeration tank.

Description

Technical Field

[0001] This invention relates to the field of wastewater treatment aeration tank technology, specifically a microbial aeration tank for wastewater treatment with self-regulating aeration volume. Background Technology

[0002] In wastewater treatment, microbial aeration tanks are typically used to continuously supply oxygen to the wastewater through aeration, enabling the microorganisms in the activated sludge to decompose organic pollutants in the wastewater. In actual operation, the aeration rate directly affects the activity of the microorganisms and the wastewater treatment efficiency. Insufficient aeration can easily lead to microbial hypoxia, reducing the efficiency of pollutant decomposition. On the other hand, excessive aeration can lead to energy waste and excessive sludge agitation, affecting sludge settling performance. Therefore, the aeration rate needs to be dynamically adjusted according to the actual state of the microorganisms inside the aeration tank.

[0003] In existing technologies, some aeration tanks typically adjust the aeration rate by detecting the dissolved oxygen (DO) content in the water. However, because the aeration tank is in a state of continuous aeration and turbulence, the bubble disturbance is strong, resulting in large fluctuations in the local DO content. The detection results are easily affected by the aeration bubbles and liquid flow disturbance, making it difficult to accurately reflect the true oxygen consumption state of the microorganisms. At the same time, when aeration is controlled by a single DO parameter, it is impossible to effectively distinguish between increased oxygen consumption caused by enhanced microbial activity and local hypoxia caused by abnormal states such as sludge aging and sludge bulking. Therefore, misjudgments in aeration adjustment are likely to occur, affecting the accuracy of aeration adjustment.

[0004] In addition, sludge settling state is also an important parameter for judging microbial activity and sludge operation status. Most existing sludge settling detection methods use manual sampling followed by static observation for analysis. This is not only cumbersome, but also cannot achieve online continuous detection, making it difficult to reflect the changes in sludge state inside the aeration tank in a timely manner. At the same time, manual detection is also easily affected by factors such as sampling time and observation error, resulting in poor stability of sludge settling detection.

[0005] Therefore, how to provide a self-regulating microbial aeration tank for wastewater treatment that can simultaneously achieve dynamic detection of dissolved oxygen (DO) and online analysis of sludge settling during continuous operation of the aeration tank, and dynamically adjust the aeration volume based on the microbial oxygen consumption status and sludge settling status, has become a technical problem that needs to be solved. Summary of the Invention

[0006] The purpose of this invention is to provide a microbial aeration tank for wastewater treatment with self-regulating aeration volume, so as to solve the problems mentioned in the background art.

[0007] To address the aforementioned technical problems, this invention provides the following technical solution: a self-regulating aeration volume microbial aeration tank for wastewater treatment, comprising an aeration tank, an aeration mechanism, a detection mechanism, and a control module; the aeration mechanism is disposed inside the aeration tank and is used to aerate the water inside the aeration tank; the detection mechanism is disposed inside the aeration tank and is used to perform dynamic DO detection and online sedimentation analysis on the water inside the aeration tank; the control module makes a comprehensive judgment on microbial activity based on the data detected by the detection mechanism and adjusts the aeration volume of the aeration mechanism.

[0008] According to the above technical solution, the aeration mechanism includes a main air pipe, the upper end of which extends to the outside of the aeration tank and is equipped with a first solenoid valve. The first solenoid valve is electrically connected to the control module and is used to adjust the air intake inside the main air pipe. The lower end of the main air pipe extends to the lower side inside the aeration tank and is fixedly connected to a branch air pipe. Aeration heads are evenly arranged on the branch air pipe.

[0009] According to the above technical solution, the detection mechanism includes a water pump, an inlet pipe is fixedly connected to the input end of the water pump, one end of the inlet pipe extends to the middle of the aeration tank, and a drain pipe is fixedly connected to the output end of the water pump, the end of the drain pipe away from the water pump extends to the upper part of the diagonal side of the aeration tank opposite to the inlet pipe.

[0010] According to the above technical solution, three sets of fixed pipes and multiple extension pipes are evenly arranged on the drain pipe. Both ends of the fixed pipe are connected to the drain pipe. The DO detection module is fixedly installed inside the fixed pipe and extends into the liquid flow area inside the fixed pipe. The extension pipe is used to extend the liquid flow path and increase the flow time of the mixed liquid inside the drain pipe.

[0011] According to the above technical solution, the control module calculates the oxygen consumption rate per unit time and the difference in DO values ​​before and after the pipeline by using the detection data from multiple DO detection modules, the water supply flow rate of the water pump, and the distance between each DO detection module and the water pump.

[0012] According to the above technical solution, a sludge content detection mechanism is provided on the drainage pipe. The sludge content detection mechanism includes a rotating tube. Both ends of the rotating tube are connected to the drainage pipe and are rotatably connected to the drainage pipe. A gear is fixedly connected to the outer wall of the rotating tube. A motor is provided on the outer wall of the aeration tank. The output end of the motor is connected to the gear through a belt.

[0013] According to the above technical solution, a second solenoid valve is fixedly connected to the middle of the rotating tube, and a sampling tube is fixedly connected to the output end of the second solenoid valve. The second solenoid valve is used to control whether the sampling tube is connected to the inside of the rotating tube, and an air hole is opened on the side wall of the sampling tube away from the second solenoid valve.

[0014] According to the above technical solution, a fixing plate is fixedly connected to the upper end of the sampling tube, and an installation hole is opened inside the fixing plate. An electromagnet is fixedly connected to the inner wall of the installation hole. A sliding sleeve is slidably fitted on the outer wall of the sampling tube. An infrared detection module is set on the lower side of the sliding sleeve at both sides of the sampling tube. An iron sheet is fixedly connected to the upper side of the sliding sleeve. A linear displacement sensing module is fixedly connected to the upper side of the fixing plate through a mounting bracket.

[0015] According to the above technical solution, the infrared detection module includes an infrared emitting end located on one side of the sampling tube and an infrared receiving end located on the other side of the sampling tube. The control module determines whether the medium at the corresponding position is clear liquid or sludge by the change in signal intensity received by the infrared receiving end, and calculates the sludge settling volume ratio inside the sampling tube by combining the sliding sleeve movement distance detected by the linear displacement sensing module.

[0016] According to the above technical solution, the control module dynamically judges the aeration demand by the oxygen consumption rate per unit time and the sludge settling volume ratio, and adjusts the opening of the first solenoid valve.

[0017] Compared with the prior art, the beneficial effects achieved by the present invention are:

[0018] 1. By setting up a water pump, inlet pipe, outlet pipe, extension pipe and multiple DO detection modules, the mixed liquor inside the aeration tank can be dynamically detected in a relatively stable flow environment. The oxygen consumption rate per unit time can be calculated by the DO change at multiple locations, avoiding interference from the aeration turbulence environment on DO detection and improving the accuracy of microbial oxygen consumption status detection.

[0019] 2. By setting up a rotary tube, a second solenoid valve and a sampling tube, a portion of the mixed liquid can be quantitatively extracted under normal flow conditions in the drainage pipe to form an independent static settling environment. After the test is completed, the sampled liquid is automatically discharged, realizing online circulation detection of sludge settling status, reducing manual sampling operations and improving the continuity of sludge testing.

[0020] 3. By setting up a sliding sleeve, an infrared detection module, an electromagnet, and a linear displacement sensing module, the medium state at different height positions can be detected in real time as the sliding sleeve moves along the sampling tube. The sludge settling volume ratio can be calculated by combining the sliding sleeve's moving distance, thereby improving the accuracy of sludge settling interface detection and avoiding the detection instability problem caused by complex image recognition structures.

[0021] 4. By setting up a dynamic DO detection structure and a sludge settling analysis structure, the system can simultaneously acquire the oxygen consumption status of microorganisms and the sludge settling status. The control module combines the oxygen consumption rate per unit time with the sludge settling volume ratio to comprehensively analyze the microbial activity status and dynamically adjust the aeration volume of the aeration mechanism. This avoids the misjudgment problem caused by traditional single DO control, improves the accuracy of aeration adjustment and oxygen utilization efficiency, and reduces ineffective aeration energy consumption. Attached Figure Description

[0022] The accompanying drawings are provided to further illustrate the invention and form part of the specification. They are used in conjunction with embodiments of the invention to explain the invention and do not constitute a limitation thereof. In the drawings:

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

[0024] Figure 2 This is a schematic diagram of the aeration mechanism of the present invention;

[0025] Figure 3 This is a schematic diagram of the detection mechanism structure of the present invention;

[0026] Figure 4 This is a partial structural diagram of the detection mechanism of the present invention;

[0027] Figure 5 This is a schematic diagram of the left side of the sludge content detection mechanism of the present invention;

[0028] Figure 6 This is a schematic diagram of the right side of the sludge content detection mechanism of the present invention;

[0029] Figure 7 This is a partial structural diagram of the sludge content detection mechanism of the present invention;

[0030] In the diagram: 1. Aeration tank; 2. Aeration mechanism; 3. Detection mechanism; 201. Main air pipe; 202. First solenoid valve; 203. Branch air pipe; 204. Aeration head; 301. Water pump; 302. Inlet pipe; 303. Drain pipe; 304. Extension pipe; 305. Fixed pipe; 306. DO detection module; 307. Sludge content detection mechanism; 701. Rotating tube; 702. Motor; 703. Gear; 704. Belt; 705. Second solenoid valve; 706. Sampling tube; 707. Fixing plate; 708. Electromagnet; 709. Sliding sleeve; 710. Infrared detection module; 711. Iron sheet; 712. Linear displacement sensing module; 713. Mounting bracket. Detailed Implementation

[0031] 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.

[0032] Example 1: Please refer to Figure 1-3This invention provides a technical solution: a microbial aeration tank for wastewater treatment with self-regulating aeration volume. Before use, the aeration mechanism 2 is first installed in the lower part of the aeration tank 1, and the upper end of the main air pipe 201 extends to the outside of the aeration tank 1 and connects to an external air supply device. Simultaneously, the first solenoid valve 202 is electrically connected to the control module, enabling the control module to adjust the gas input volume inside the main air pipe 201. A branch air pipe 203 is fixedly connected to the lower end of the main air pipe 201, and multiple aeration heads 204 are evenly arranged on the outer wall of the branch air pipe 203, releasing air bubbles evenly into the aeration tank 1 through the aeration heads 204. At the same time, a detection mechanism 3 is installed inside the aeration tank 1, and the input end of the water pump 301 extends to the middle part of the aeration tank 1 through the inlet pipe 302, while the output end connects to the drain pipe 303, enabling the water pump 301 to continuously extract the mixed liquid inside the aeration tank 1 and form... The system features a circulating flow path. The drain pipe 303 extends from the end furthest from the pump 301 into the upper part of the aeration tank 1, diagonally opposite the inlet pipe 302. This allows the tested mixed liquid to flow back into the aeration tank 1, forming a circulating detection path. During operation, the control module activates the first solenoid valve 202 to regulate the air intake of the main air pipe 201. The gas enters the aeration head 204 via the branch air pipe 203 and is evenly aerated upwards, ensuring a continuous oxygen supply for the microorganisms inside the aeration tank 1. Simultaneously, the pump 301 continuously draws the mixed liquid into the drain pipe 303 for circulating transport. By forming a stable circulating flow, the detection mechanism 3 can continuously detect the mixed liquid state even when detached from the violent turbulence within the aeration tank 1, improving the stability of subsequent DO detection and sludge analysis. This achieves the effect of simultaneous microbial aeration and detection processes within the aeration tank 1.

[0033] Example 2: Please refer to Figure 1-4Based on Embodiment 1, the present invention provides a technical solution: Three extension pipes 304 and three sets of fixed pipes 305 are evenly arranged on the outer wall of the drain pipe 303. Both ends of the fixed pipes 305 are connected to the drain pipe 303. A DO detection module 306 is fixedly installed inside the fixed pipe 305 and extends into the liquid flow area inside the fixed pipe 305 for real-time detection of the DO content in the mixed liquid flowing through the corresponding position. The extension pipes 304 are arranged on the side of the corresponding fixed pipe 305 near the water pump 301, and both ends of the extension pipes 304 are connected to the drain pipe 303, thereby extending the liquid flow path and increasing the flow time of the mixed liquid inside the drain pipe 303. During operation, the water pump 301 continuously delivers the mixed liquid into the drain pipe 303. Since the mixed liquid no longer continuously contacts the aeration bubbles during its flow inside the drain pipe 303, This microorganism continuously consumes dissolved oxygen in the water. Three DO detection modules 306 detect the DO content of the mixture at different locations. The control module simultaneously acquires the detection data from the three DO detection modules 306, the water supply flow rate of the water pump 301, and the distance parameters between each DO detection module 306 and the water pump 301. This allows the module to calculate the oxygen consumption rate of the mixture per unit time and the DO difference before and after the detection pipeline. When the control module determines that the oxygen consumption rate per unit time is increasing, it indicates that the microbial activity is enhanced. Therefore, it controls the first solenoid valve 202 to increase the air supply of the main air pipe 201 and increase the aeration intensity. Conversely, when the oxygen consumption rate per unit time decreases, it reduces the air supply. This avoids the misjudgment problem caused by traditional aeration control based solely on a single-point DO value, achieving dynamic aeration adjustment based on the actual oxygen consumption behavior of the microorganisms.

[0034] Example 3: Please refer to Figure 1-7Based on Embodiments 1 and 2, the present invention provides the following technical solution: A sludge content detection mechanism 307 is provided on the outer wall of the drainage pipe 303. The sludge content detection mechanism 307 includes a rotating tube 701. Both ends of the rotating tube 701 are connected to the two drainage pipes 303 on both sides, and the inner walls of both ends of the rotating tube 701 are rotatably connected to the outer wall of the drainage pipe 303 through bearings, so that the rotating tube 701 can rotate relative to the drainage pipe 303. A gear 703 is fixedly connected to the outer wall of the rotating tube 701. A motor 702 is provided on the outer wall of the aeration tank 1. The output end of the motor 702 is connected to the gear 703 through a belt 704 for driving the rotating tube 701 to rotate. A second solenoid valve 705 is fixedly connected to the upper side of the middle part of the rotating tube 701. A sampling tube 706 is fixedly connected to the upper side of the second solenoid valve 705. An air hole is opened on the side wall of the sampling tube 706 away from the second solenoid valve 705. Under normal conditions... In the normal state, the sampling tube 706 and the second solenoid valve 705 are located on the upper side of the rotating tube 701, allowing the liquid inside the drain pipe 303 to flow smoothly through the interior of the rotating tube 701, while preventing sludge from accumulating between the second solenoid valve 705 and the rotating tube 701. When sludge detection is required, the control module starts the motor 702, which drives the rotating tube 701 to rotate via the belt 704 and gear 703, causing the sampling tube 706 to flip to the lower side of the rotating tube 701. Then, the second solenoid valve 705 is opened, allowing the mixed liquid inside the drain pipe 303 to flow into the sampling tube 706. After the sampling tube 706 is full, the second solenoid valve 705 is closed, and the motor 702 drives the rotating tube 701 to rotate in the opposite direction, causing the sampling tube 706 to return to the upper position of the rotating tube 701. This allows the mixed liquid inside the sampling tube 706 to enter a static state, achieving the effect of online isolation sedimentation detection.

[0035] Example 4: Please refer to Figure 1-7Based on Embodiments 1, 2, and 3, the present invention provides the following technical solution: A fixing plate 707 is fixedly connected to the upper end of the sampling tube 706. A through-hole is formed inside the fixing plate 707, and an electromagnet 708 is fixedly connected to the inner wall of the hole. A sliding sleeve 709 is slidably fitted onto the outer wall of the sampling tube 706 below the fixing plate 707, allowing the sliding sleeve 709 to slide up and down along the outer wall of the sampling tube 706. Infrared detection modules 710 are located on both sides of the sampling tube 706 below the sliding sleeve 709. An iron sheet 711 is fixedly connected to the upper side of the sliding sleeve 709. A linear displacement sensing module 712 is fixedly connected to the upper side of the fixing plate 707 via a mounting bracket 713. The linear displacement sensing module 712 is used to detect the real-time displacement of the sliding sleeve 709 along the outer wall of the sampling tube 706. The infrared detection module 710 includes an infrared emitting end located on one side of the sampling tube 706 and an infrared receiving end located on the other side of the sampling tube 706. The infrared emitting end emits infrared light into the sampling tube 706, and the infrared receiving end receives the infrared signal after passing through the liquid inside the sampling tube 706. When the corresponding position inside the sampling tube 706 is clear liquid, the infrared receiving end can receive a strong infrared signal because the clear liquid has a high light transmittance. However, when the corresponding position is a sludge layer, the infrared light is scattered and blocked during the propagation of the sludge due to the high concentration of suspended particles inside the sludge, resulting in a significant decrease in the signal strength received by the infrared receiving end. The control module determines whether the medium corresponding to the current detection position is clear liquid or sludge based on the change in the signal strength received by the infrared receiving end.

[0036] Under normal operating conditions, the sampling tube 706 and the second solenoid valve 705 are located on the upper side of the rotary tube 701, at which time the entire sampling tube 706 is in a state of... Figure 5 In the inverted state shown, the sliding sleeve 709 slides downwards along the outer wall of the sampling tube 706 under the action of gravity to the connection position between the sampling tube 706 and the second solenoid valve 705. Simultaneously, since the sampling tube 706 and the second solenoid valve 705 are located above the rotating tube 701, the liquid flow inside the drain pipe 303 is less likely to accumulate sludge at the connection gap between the second solenoid valve 705 and the rotating tube 701 when it flows through the rotating tube 701, thus reducing sludge adhesion and blockage. When sludge detection is required, the control module starts the motor 702, which is driven by belt 7... 04 drives gear 703 to rotate, gear 703 drives rotating tube 701 to rotate 180 degrees, causing sampling tube 706 and second solenoid valve 705 to rotate to the lower side of rotating tube 701. During the rotation, since sliding sleeve 709 is always subjected to gravity, sliding sleeve 709 will continue to adhere to the lowest side area of ​​the outer wall of sampling tube 706 and slide relative to the outer wall of sampling tube 706. When sampling tube 706 rotates to the lower side of rotating tube 701, sampling tube 706 returns to the positive vertical state. At this time, sliding sleeve 709 slides down to the upper surface of fixed plate 707 under the action of gravity.

[0037] Subsequently, the control module energizes the electromagnet 708, which magnetically attracts the iron plate 711, thereby fixing the sliding sleeve 709 to the lower side of the fixing plate 707, preventing the sliding sleeve 709 from slipping off before subsequent settlement detection. Then, the control module opens the second solenoid valve 705, allowing the mixed liquid inside the drain pipe 303 to flow into the sampling tube 706 through the rotating tube 701 under water pressure. Simultaneously, the air inside the sampling tube 706 is discharged through the vent hole on the side wall away from the second solenoid valve 705, allowing the mixed liquid to gradually fill... The sampling tube 706 is filled to the brim. After the sampling tube 706 is filled, the control module closes the second solenoid valve 705 and then starts the motor 702 again to drive the rotating tube 701 to rotate in the opposite direction, so that the sampling tube 706 and the second solenoid valve 705 return to the upper position of the rotating tube 701. At this time, because the electromagnet 708 continues to attract the iron piece 711, the sliding sleeve 709 is always fixed to the lower position of the fixing plate 707 during the flipping and reset process of the sampling tube 706, and will not slip off again due to the flipping of the sampling tube 706, thus ensuring that the starting position of subsequent sludge detection is fixed.

[0038] After the sampling tube 706 returns to the upper side of the rotating tube 701, the mixture inside the sampling tube 706 begins to settle. After a preset settling time, the control module turns off the electromagnet 708 and simultaneously starts the infrared detection module 710. After the sliding sleeve 709 loses its magnetic attraction, it slides downward along the outer wall of the sampling tube 706 under the action of gravity. At the same time, the linear displacement sensing module 712 records the moving distance of the sliding sleeve 709 in real time. During the downward movement of the sliding sleeve 709, the infrared detection module 710 continuously detects the medium inside the sampling tube 706 at the current height position. When the liquid at the corresponding position of the infrared detection module 710 is clear, the infrared receiver receives the signal. The received signal strength remains above the preset threshold. As the sliding sleeve 709 continues to move downward, when the infrared detection module 710 moves to the height position corresponding to the sludge settling layer, the signal strength received by the infrared receiver will drop below the preset threshold due to the enhanced blocking and scattering effect of the sludge on the infrared light. The control module then determines that the current detection position has entered the sludge area from the clear liquid area, and simultaneously reads the moving distance of the sliding sleeve 709 recorded by the linear displacement sensing module 712, thereby obtaining the height of the clear liquid layer inside the sampling tube 706. The control module then calculates the sludge settling volume ratio in combination with the overall length of the sampling tube 706 to achieve online sludge settling ratio analysis.

[0039] After the sludge test is completed, the control module opens the second solenoid valve 705 again and temporarily shuts down the water pump 301. Since the upper side wall of the sampling tube 706 has an air hole, external air can enter the interior of the sampling tube 706 through the air hole, so that the interior of the sampling tube 706 forms a gas-liquid communication state. The sludge and water that have settled inside the sampling tube 706 flow back into the rotating tube 701 and the drain pipe 303 under the action of gravity and are discharged. Then the control module closes the second solenoid valve 705 and restarts the water pump 301.

[0040] The control module combines the oxygen consumption rate per unit time and the sludge settling ratio detected by the DO detection module 306 to comprehensively analyze the microbial activity status, and dynamically adjusts the opening of the first solenoid valve 202 to regulate the aeration volume, improve the accuracy of aeration regulation, and reduce ineffective aeration energy consumption.

[0041] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0042] Finally, it should be noted that the above descriptions are merely preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A self-regulating aeration rate microbial aeration tank for wastewater treatment, comprising an aeration tank (1), characterized in that: The aeration tank (1) is equipped with an aeration mechanism (2) and a detection mechanism (3). The detection mechanism (3) includes a water pump (301), an inlet pipe (302), a drain pipe (303), and a DO detection module (306). The water pump (301) is used to extract the mixed liquid inside the aeration tank (1) and form a circulating liquid flow through the drain pipe (303). The DO detection module (306) is used to detect the DO content in the circulating liquid flow. The drain pipe (303) is provided with a sludge content detection mechanism (307). The sludge content detection mechanism (307) includes a rotating pipe (701), a motor (702) for driving the rotating pipe (701) to rotate, a second solenoid valve (705) provided on the rotating pipe (701), and a sampling pipe (706) connected to the second solenoid valve (705). A sliding sleeve (709) is slidably sleeved on the outer wall of the sampling pipe (706). An infrared detection module (710) is provided on the sliding sleeve (709). An electromagnet (708) for limiting the movement state of the sliding sleeve (709) and a linear displacement sensing module (712) for detecting the movement distance of the sliding sleeve (709) are provided on the sampling pipe (706). The first solenoid valve (202), DO detection module (306), motor (702), second solenoid valve (705), electromagnet (708), infrared detection module (710) and linear displacement sensing module (712) are all electrically connected to the control module; The control module is used to comprehensively analyze the microbial activity status based on the mixed liquor oxygen consumption data detected by the DO detection module (306) and the sludge settling data detected by the sludge content detection mechanism (307), and to control the first solenoid valve (202) to adjust the aeration volume.

2. The self-regulating aeration rate microbial aeration tank for wastewater treatment according to claim 1, characterized in that: The aeration mechanism (2) includes a main air pipe (201), a first solenoid valve (202) disposed on the main air pipe (201), a branch air pipe (203) connected to the main air pipe (201), and an aeration head (204) disposed on the branch air pipe (203). The lower end of the main air pipe (201) is connected to the interior of the branch air pipe (203), and multiple aeration heads (204) are evenly disposed on the outer wall of the branch air pipe (203).

3. A microbial aeration tank for wastewater treatment with self-regulating aeration rate according to claim 2, characterized in that: The water pump (301) input end extends to the middle area inside the aeration tank (1) through the water inlet pipe (302), and the drain pipe (303) extends to the upper area inside the aeration tank (1) at the end away from the water pump (301).

4. A microbial aeration tank for wastewater treatment with self-regulating aeration rate according to claim 3, characterized in that: The outer wall of the drain pipe (303) is provided with a plurality of fixed pipes (305), both ends of the fixed pipes (305) are connected to the drain pipe (303), and the DO detection module (306) is located inside the fixed pipes (305).

5. A microbial aeration tank for wastewater treatment with self-regulating aeration rate according to claim 4, characterized in that: An extension pipe (304) is provided on the outer wall of the drain pipe (303) on the side of the fixed pipe (305) near the water pump (301), and both ends of the extension pipe (304) are connected to the drain pipe (303).

6. A microbial aeration tank for wastewater treatment with self-regulating aeration rate according to claim 5, characterized in that: Both ends of the rotating tube (701) are connected to the drain pipe (303), and both ends of the rotating tube (701) are rotatably connected to the drain pipe (303) through bearings. A gear (703) is fixedly connected to the outer wall of the rotating tube (701), and the output end of the motor (702) is connected to the gear (703) through a belt (704).

7. A microbial aeration tank for wastewater treatment with self-regulating aeration rate according to claim 6, characterized in that: The sampling tube (706) has an air hole on the side wall of the end away from the second solenoid valve (705).

8. A microbial aeration tank for wastewater treatment with self-regulating aeration rate according to claim 7, characterized in that: The infrared detection module (710) includes an infrared emitting end located on one side of the sampling tube (706) and an infrared receiving end located on the other side of the sampling tube (706).

9. A microbial aeration tank for wastewater treatment with self-regulating aeration rate according to claim 8, characterized in that: An iron sheet (711) is fixedly connected to the sliding sleeve (709), and the electromagnet (708) is used to attract the iron sheet (711) to limit the movement of the sliding sleeve (709).

10. An aeration regulation method for a microbial aeration tank for wastewater treatment with self-regulating aeration volume according to any one of claims 1-9, characterized in that, Includes the following steps: S1: The water pump (301) continuously draws the mixed liquid inside the aeration tank (1) into the drain pipe (303) for internal circulation. S2: The changes in DO in the mixture along the flow direction are detected by multiple DO detection modules (306), and the oxygen consumption rate per unit time is calculated by combining the water supply flow rate and the distance between each DO detection module (306) and the water pump (301). S3: Drive the rotating tube (701) to rotate by the motor (702), so that the sampling tube (706) rotates to the lower side of the rotating tube (701) and then the second solenoid valve (705) is opened, so that the mixture enters the sampling tube (706). After the sampling is completed, close the second solenoid valve (705) and return the sampling tube (706) to the upper side of the rotating tube (701). S4: After the mixed liquid inside the sampling tube (706) has settled for a preset time, release the sliding sleeve (709) and detect the sludge settling ratio through the infrared detection module (710) and the linear displacement sensing module (712). S5: The control module judges the microbial activity status based on the oxygen consumption rate per unit time and the sludge settling ratio, and adjusts the aeration volume of the aeration mechanism (2).

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