Aeration system and method for sewage treatment

Abstract

The present invention belongs to the technical field of sewage treatment, and specifically relates to an aeration system and method for sewage treatment, comprising a mounting unit fixed at one end, a mounting barrel fixed at the other end of the mounting unit, an adjustment motor fixed at the upper end of the mounting barrel, an adjustment barrel rotatably sleeved within the mounting barrel, the output shaft of the adjustment motor fixedly connected to the adjustment barrel, an adjustment rod sleeved within the adjustment barrel, the adjustment barrel and the adjustment rod threadedly connected, a support tube fixedly connected to the lower end of the adjustment rod, a submersible motor mounted on the support tube, an aeration rod connected to the output shaft of the submersible motor, an impeller mounted on the aeration rod, and the submersible motor connected to an oxygenation unit. The mounting unit-adjustment barrel-adjustment rod structural design dynamically matches the impeller's operating depth with the sewage's dissolved oxygen demand. This structure overcomes the ineffective aeration problem caused by the fixed installation of traditional aeration devices and avoids energy waste caused by continuous full-load operation.

Description

Technical Field

[0001] The present invention belongs to the technical field of sewage treatment, and in particular relates to an aeration system and method for sewage treatment. Background Art

[0002] In the biological treatment of wastewater, aeration plays a key role in providing dissolved oxygen to the microorganisms in the activated sludge. Its technical performance directly impacts the efficiency and operating costs of the entire wastewater treatment system. As a key step in the biological treatment process, the activated sludge process decomposes organic matter into inorganic matter through aerobic respiration by microorganisms, and aeration is the core process that maintains this biochemical reaction.

[0003] The existing aeration device technology still has certain problems: the energy consumption structure is unbalanced, and the energy consumption of the aeration link accounts for 50%-70% of the total energy consumption of sewage treatment. Traditional equipment causes excessive oxidation due to continuous aeration, resulting in waste of electricity; the mass transfer efficiency is low, and insufficient air delivery pressure leads to limited oxygen solubility rate, making it difficult to meet the oxygen demand of microorganisms under complex water quality conditions; the degree of automation is lagging behind, and the control mode of existing aeration devices usually adopts timing control or adjustment according to dissolved oxygen concentration. When the timing control strategy is adopted, it is impossible to monitor and respond to water quality fluctuations in real time; when the strategy of adjustment according to dissolved oxygen concentration is adopted, due to the large lag in sensor detection, the aeration volume is not adjusted in time, which may lead to oxygen deficiency in the front aeration stage and oxygen excess in the back aeration stage. Summary of the Invention

[0004] In response to the problems in the prior art, the present invention provides an aeration system and method for sewage treatment, which solves the problem that the traditional aeration device in the prior art adopts a control mode in the form of timing control or adjustment according to dissolved oxygen concentration, which cannot respond to water quality fluctuations in real time and has a large detection lag, thereby leading to hypoxia in the front section and excess oxygen in the back section.

[0005] The technical solution adopted in the present invention is as follows:

[0006] In the first aspect, the present application provides an aeration system for sewage treatment, including a fixed installation cylinder, an adjusting motor fixedly provided at the upper end of the installation cylinder, an adjusting cylinder rotatably sleeved in the installation cylinder, the output shaft of the adjusting motor is fixedly connected to the adjusting cylinder, an adjusting rod is sleeved in the adjusting cylinder, the adjusting cylinder is threadedly connected to the adjusting rod, a support pipe is fixedly connected to the lower end of the adjusting rod, a submersible motor is installed on the support pipe, the output shaft of the submersible motor is connected to the aeration rod, an impeller is provided on the aeration rod, and the aeration system is also provided with an oxygenation unit, which is connected to the submersible motor for supplying oxygen to the aeration system.

[0007] Preferably, the oxygenation unit includes a blower and an oxygenation pipe, one end of the oxygenation pipe is connected to the blower, the oxygenation unit also includes a gas-liquid mixing chamber, the gas-liquid mixing chamber is fixed at the lower end of the submersible motor, and the other end of the oxygenation pipe is connected to the gas-liquid mixing chamber.

[0008] Preferably, the oxygenation tube is a silicone hose, and a gas volume control module is provided on the oxygenation tube, and the gas volume control module is used to control the gas flow rate in the oxygenation tube.

[0009] Preferably, a plurality of first through holes are provided on the outer shell of the submersible motor, and a plurality of second through holes are provided on the gas-liquid mixing chamber.

[0010] Preferably, the lower end of the gas-liquid mixing chamber is fixedly connected to a collecting cover via a diameter-changing unit, and the lower end of the collecting cover is located below the impeller.

[0011] Preferably, a dissolved oxygen sensor is installed inside the collecting cover or the reducing unit, and the dissolved oxygen sensor is used to monitor the DO value of the liquid discharged from the gas-liquid mixing chamber.

[0012] Preferably, it further includes a control unit, which is connected to the dissolved oxygen sensor, the regulating motor, the submersible motor, and the gas volume control module respectively.

[0013] Preferably, the aeration system further comprises a mounting unit, one end of the mounting unit is fixedly connected to the mounting barrel, and the other end of the mounting unit is used for connecting to the outside world.

[0014] In a second aspect, the present application provides an aeration method for sewage treatment, which uses the aeration system for sewage treatment described in the first aspect, comprising the following steps:

[0015] Step S1: The motor is adjusted to adjust the collecting cover to the lowest height state, and the control unit obtains monitoring data from the dissolved oxygen sensor and the gas volume control module;

[0016] Step S2: inputting a preset DO value into the control unit;

[0017] Step S3: The control unit calculates the input value of the gas volume control module using proportional integral differential according to the preset DO value and the actual monitored value, sends the signal to the gas volume control module for control, and monitors the rate of change of the DO value within the time window;

[0018] Step S4: The control unit obtains the adjustment motor data. When the collecting cover is at the highest height, the process goes to step S6; otherwise, the process goes to step S5.

[0019] Step S5: Adjust the motor with a step length a to increase the height of the hood, and jump to step S3 after each adjustment;

[0020] Step S6: Select the data corresponding to the regulating motor when the DO value change rate is the largest as the working data.

[0021] Preferably, in step S3, the proportional-integral-differential control law is:

[0022]

[0023] in, To control the output, it is the gas flow rate value of the gas volume control module; is the proportional gain; is the integration time constant; is the differential time constant; It is the error signal, which is the difference signal between the preset DO value and the actual monitoring value.

[0024] It can be seen from the above technical solutions that this application has the following advantages:

[0025] 1. Through the structural design of the installation unit-adjustment cylinder-adjustment rod, when the adjustment motor drives the adjustment cylinder to rotate, the threaded transmission mechanism can accurately control the vertical displacement of the support pipe and aeration unit, dynamically matching the impeller working depth with the dissolved oxygen demand of the sewage. This structure effectively overcomes the ineffective aeration problem caused by the fixed installation of traditional aeration devices and avoids the energy waste caused by continuous full-load operation. At the same time, the submersible motor drives the impeller to form local turbulence, and the height adjustment function is combined with the enhancement of gas-liquid mixing efficiency. The coordinated operation of the adjustment motor and the control unit provides the mechanical execution basis for intelligent aeration control.

[0026] 2. A dual-powered synergistic oxygen supply mechanism is formed by the installed blower and submersible motor through the oxygenation pipe. The blower provides a basic oxygen source of high-pressure gas, and the rotation of the submersible motor's impeller creates a negative pressure suction effect. The combination of the two enhances the coupling of gas delivery pressure and liquid disturbance intensity, compared to single mechanical aeration or blast aeration systems.

[0027] 3. The flexible characteristics of the silicone hose can adapt to the pipeline deformation requirements when the aeration unit height is adjusted, avoiding the risk of interface leakage or rupture caused by mechanical displacement of traditional rigid pipelines; the gas volume control module detects the gas flow rate in real time and feeds it back to the control unit to form a closed-loop control of gas supply, ensuring a dynamic balance between aeration intensity and microbial oxygen demand, and reducing the frequency of manual intervention.

[0028] 4. The setting of the gas-liquid mixing chamber constructs the primary diffusion zone of the gas, and the large bubbles are broken into small bubbles through the turbulent shearing effect inside the cavity, which significantly increases the gas-liquid contact specific surface area.

[0029] 5. The first through hole and the second through hole are provided to facilitate the flow of liquid, eliminating the need to absorb liquid at the bottom for mixing, thereby improving mixing efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] In order to more clearly illustrate the technical solution of the present application, the following is a brief introduction to the drawings required for the description. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0031] Figure 1 Schematic diagram of the structure of the aeration system for sewage treatment shown in the embodiment;

[0032] Figure 2 The figure is a flow chart of the aeration method for sewage treatment shown in the embodiment.

[0033] In the figure: 1. Installation unit; 2. Installation cylinder; 3. Adjustment cylinder; 4. First diameter reduction; 5. Submersible motor; 6. Gas-liquid mixing chamber; 7. Dissolved oxygen sensor; 8. Second diameter reduction; 9. Impeller; 10. Support tube; 11. Collecting cover; 12. Oxygenation tube; 13. Gas volume control module; 14. Control unit; 15. Upper computer; 16. First through hole; 17. Second through hole; 18. Blower; 19. Third diameter reduction; 20. Adjustment motor; 21. Internal thread; 22. Adjustment rod; 23. Aeration rod. DETAILED DESCRIPTION

[0034] In order to make the application objectives, features, and advantages of this application more obvious and easy to understand, the technical solutions protected by this application will be clearly and completely described below using specific embodiments and drawings. Obviously, the embodiments described below are only part of the embodiments of this application, not all of them. Based on the embodiments in this patent, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this patent.

[0035] In the biological treatment of wastewater, aeration plays a key role in providing dissolved oxygen to the microorganisms in the activated sludge. Its technical performance directly impacts the efficiency and operating costs of the entire wastewater treatment system. As a key step in the biological treatment process, the activated sludge process decomposes organic matter into inorganic matter through aerobic respiration by microorganisms, and aeration is the core process that maintains this biochemical reaction.

[0036] Aeration not only needs to achieve efficient mass transfer between gas and liquid, ensure that oxygen molecules are fully diffused and form a dynamic mixing system with microorganisms and substrates, but also optimize the microbial metabolic environment by precisely controlling the dissolved oxygen (DO) concentration.

[0037] Existing forced aeration and mechanical aeration technologies still have certain problems: the energy consumption structure is unbalanced, with energy consumption in the aeration process accounting for 50%-70% of the total energy consumption of sewage treatment. Traditional equipment suffers from excessive oxidation due to continuous aeration, resulting in waste of electricity; the mass transfer efficiency is low, and insufficient air delivery pressure limits the oxygen solubility rate, making it difficult to meet the oxygen demand of microorganisms under complex water quality conditions; the degree of automation lags behind, and the control mode of existing aeration devices cannot respond to water quality fluctuations in real time, resulting in problems such as hypoxia in the front section and excess oxygen in the back section.

[0038] In response to the problems in the prior art, the present invention provides an aeration system and method for sewage treatment, which solves the problem that the control mode of the traditional aeration device in the prior art cannot respond to water quality fluctuations in real time, resulting in oxygen deficiency in the front section and oxygen excess in the back section.

[0039] The present application provides an aeration system for sewage treatment, comprising a mounting unit 1 fixed at one end, a mounting cylinder 2 fixedly provided at the other end of the mounting unit 1, an outer wall of the mounting cylinder 2 fixedly connected to the mounting unit 1, an adjusting motor 20 fixedly provided at the upper end of the mounting cylinder 2, an adjusting cylinder 3 rotatably sleeved in the mounting cylinder 2, an output shaft of the adjusting motor 20 fixedly connected to the adjusting cylinder 3, an adjusting rod 22 sleeved in the adjusting cylinder 3, the adjusting cylinder 3 and the adjusting rod 22 being threadedly connected, a support tube 10 fixedly connected to the lower end of the adjusting rod 22, a submersible motor 5 installed on the support tube 10, an aeration rod 23 connected to the output shaft of the submersible motor 5, an impeller 9 provided on the aeration rod 23, and an oxygenating unit further provided in the aeration system, which is connected to the submersible motor 5 for supplying oxygen to the aeration system.

[0040] The submersible motor 5 is mounted on the support pipe 10 via the first reducer 4 .

[0041] Through the structural design of the installation unit 1-adjustment cylinder 3-adjustment rod 22, when the adjustment motor 20 drives the adjustment cylinder 3 to rotate, the threaded transmission mechanism can accurately control the vertical displacement of the support pipe 10 and the aeration unit, so that the working depth of the impeller 9 is dynamically matched with the dissolved oxygen demand of the sewage. This structure effectively overcomes the problem of ineffective aeration caused by the fixed installation of traditional aeration devices and avoids the energy waste caused by continuous full-load operation; at the same time, the submersible motor 5 drives the impeller 9 to form local turbulence, and cooperates with the height adjustment function to enhance the gas-liquid mixing efficiency; the coordinated work of the adjustment motor 20 and the control unit 14 provides a mechanical execution basis for intelligent aeration control.

[0042] Mounting unit 1 is constructed of duplex stainless steel, sandblasted and passivated to create a corrosion-resistant coating. A universal adjustment flange is fitted to the fixed end of mounting unit 1, allowing for ±15° vertical rotation to accommodate various tank configurations. The free end of mounting unit 1 is heat-welded to the cylindrical mounting tube 2. Precision guide grooves are machined into the inner wall of the tube, creating a sliding fit with raised guide rails on the outer wall of adjustment tube 3.

[0043] The regulating motor 20 is a closed-loop stepper motor, which is rigidly connected to the top of the mounting tube 2 via a flange mounting seat. The end of the motor's output shaft is machined with a D-shaped section, forming a keyless connection with the D-shaped groove on the top of the regulating tube 3.

[0044] The regulating cylinder 3 is cast from high-strength aluminum bronze, and the inner wall is machined with a trapezoidal internal thread 21. The thread working surface is nitrided to form a wear-resistant layer with a hardness of HRC60.

[0045] The outer surface of the adjusting rod 22 is processed with a thread pair that matches the adjusting cylinder 3, and the thread contact surface is coated with a molybdenum disulfide solid lubricating film to reduce the friction coefficient.

[0046] The support pipe 10 adopts a segmented combined structure, the upper pipe section is connected to the adjustment rod 22 through a tapered thread, and an anaerobic thread locking agent is applied to the mating surface to prevent loosening.

[0047] The submersible motor 5 is a permanent magnet synchronous underwater power device, and its housing is made of 316L stainless steel. The motor output shaft is connected to the aeration rod 23 through an involute spline.

[0048] Aeration rod 23 is a variable-section shaft-like component; mounted below is a six-bladed, swept-back impeller 9, featuring airfoil-shaped blades with a 45° adjustable mounting angle. A guide shroud surrounds impeller 9, maintaining a 1.5mm gap between the shroud and the blade tips, creating a Venturi-effect acceleration channel.

[0049] In some embodiments, the oxygenation unit includes a blower 18 and an oxygenation tube 12 . One end of the oxygenation tube 12 is connected to the blower 18 , and the other end is disposed between the submersible motor 5 and the impeller 9 .

[0050] The blower 18 and the submersible motor 5 form a dual-powered synergistic oxygen supply mechanism through the oxygenation pipe 12. The blower 18 provides a high-pressure gas base oxygen source, and the rotation of the impeller 9 of the submersible motor 5 generates a negative pressure suction effect. The combined effect of the two enhances the coupling between gas delivery pressure and liquid disturbance intensity, compared to single mechanical aeration or blast aeration systems.

[0051] The oxygenation unit utilizes a dual-source air supply system, comprising a high-pressure air source, flexible air pipelines, and a high-efficiency gas-liquid mixing device. The blower 18 utilizes a three-stage centrifugal booster unit, and a cyclone separator is installed at the outlet to remove oil and water impurities. The oxygenation tube 12 utilizes a four-layer composite silicone hose with an antibacterial coating, a Kevlar-reinforced fiber interlayer, and a polyurethane wear-resistant sheath.

[0052] The gas flow control module 13 integrates a thermal mass flow meter and an electric ball valve, with a flow measurement resolution of 0.1 cubic meters per hour and a valve opening adjustment accuracy of ±0.5%. The module also features a built-in PID controller with a 100 millisecond sampling period, enabling real-time adjustment of gas flow based on setpoints. The gas-liquid mixing chamber 6 is a diffuser structure with an internal honeycomb-shaped flow guide grid.

[0053] In some embodiments, the oxygenation tube 12 is a silicone hose, and a gas volume control module 13 is provided on the oxygenation tube 12 . The gas volume control module 13 is used to control the gas flow rate in the oxygenation tube 12 .

[0054] The flexible characteristics of the silicone hose can adapt to the pipeline deformation requirements when the aeration unit height is adjusted, avoiding the risk of interface leakage or rupture caused by mechanical displacement of traditional rigid pipelines; the gas volume control module 13 detects the gas flow rate in real time and feeds it back to the control unit 14 to form a closed-loop control of gas supply, ensuring the dynamic balance between aeration intensity and microbial oxygen demand, and reducing the frequency of manual intervention.

[0055] In some embodiments, the oxygenation unit further includes a gas-liquid mixing chamber 6 , which is fixed at the lower end of the submersible motor 5 , and the other end of the oxygenation pipe 12 is connected to the gas-liquid mixing chamber 6 .

[0056] The provision of the gas-liquid mixing chamber 6 constructs a primary gas diffusion zone, which breaks large bubbles into small bubbles through the turbulent shearing action inside the cavity, significantly increasing the gas-liquid contact specific surface area.

[0057] In some embodiments, a plurality of first through holes 16 are formed on the outer shell of the submersible motor 5 , and a plurality of second through holes 17 are formed on the gas-liquid mixing chamber 6 .

[0058] The first through hole 16 and the second through hole 17 are provided to facilitate the flow of liquid, eliminating the need to absorb liquid at the bottom for mixing, thereby improving mixing efficiency.

[0059] In some embodiments, the lower end of the gas-liquid mixing chamber 6 is fixedly connected to a collecting cover 11 via a reducing unit, and the lower end of the collecting cover 11 is located below the impeller 9 .

[0060] The diameter-changing unit includes a second diameter-changing portion 8 and a third diameter-changing portion 19 .

[0061] In some embodiments, a dissolved oxygen sensor 7 is installed inside the collecting cover 11 or the reducing unit. The dissolved oxygen sensor 7 is used to monitor the DO value of the liquid discharged from the gas-liquid mixing chamber 6.

[0062] In some embodiments, the system further includes a control unit 14, which is connected to the dissolved oxygen sensor 7, the regulating motor 20, the submersible motor 5, the gas volume control module 13, and the host computer 15. In some embodiments, the present application provides an aeration method for sewage treatment, using the aeration system for sewage treatment described in the first aspect, including the following steps:

[0063] Step S1: The motor is adjusted to adjust the collecting cover to the lowest height state, and the control unit obtains monitoring data of the dissolved oxygen sensor and the gas volume control module, and obtains control data of the gas volume control module;

[0064] Step S2: inputting a preset DO value into the control unit;

[0065] Step S3: The control unit calculates the input value of the gas volume control module using proportional integral differential according to the preset DO value and the actual monitored value, sends the signal to the gas volume control module for control, and monitors the rate of change of the DO value within the time window;

[0066] Step S4: The control unit obtains the adjustment motor data. When the collecting cover is at the highest height, the process goes to step S6; otherwise, the process goes to step S5.

[0067] Step S5: Adjust the motor with a step length a to increase the height of the hood, and jump to step S3 after each adjustment;

[0068] Step S6: Select the data corresponding to the regulating motor when the DO value change rate is the largest as the working data.

[0069] Preferably, in step S3, the proportional-integral-differential control law is:

[0070]

[0071] in, To control the output, it is the gas flow rate value of the gas volume control module; is the proportional gain; is the integration time constant; is the differential time constant; It is the error signal, which is the difference signal between the preset DO value and the actual monitoring value.

[0072] It is understood that the systems, devices, modules, or units described in the above embodiments may be implemented by computer chips or physical devices, or by products having certain functions. A typical implementation device is a computer, which may be a personal computer, a laptop computer, a personal digital assistant, a tablet computer, a wearable device, or a combination of any of these devices.

[0073] In a typical configuration, a computer includes one or more processors (CPUs), input / output interfaces, network interfaces, and memory.

[0074] Memory may include non-permanent storage in a computer-readable medium, random access memory (RAM) and / or non-volatile memory in the form of read-only memory (ROM) or flash RAM. Memory is an example of a computer-readable medium.

[0075] Computer-readable media include permanent and non-permanent, removable and non-removable media that can be used to store information using any method or technology. Information can be computer-readable instructions, data structures, program modules, or other data. Examples of computer storage media include, but are not limited to, phase change memory (PRAM), static random access memory (SRAM), dynamic random access memory (DRAM), other types of random access memory (RAM), read-only memory (ROM), electrically erasable programmable read-only memory (EEPROM), flash memory or other memory technology, compact disc read-only memory (CD-ROM), digital versatile disc (DVD) or other optical storage, magnetic cassettes, disk storage, quantum memory, graphene-based storage media or other magnetic storage devices, or any other non-transmission media that can be used to store information that can be accessed by a computing device. As defined herein, computer-readable media does not include transitory media such as modulated data signals and carrier waves.

[0076] It should be noted that the user information (including but not limited to user device information, user personal information, etc.) and data (including but not limited to data used for analysis, stored data, displayed data, etc.) involved in this application are all information and data authorized by the user or fully authorized by all parties, and the collection, use and processing of relevant data must comply with the relevant laws, regulations and standards of relevant countries and regions, and provide corresponding operation entrances for users to choose to authorize or refuse.

[0077] It should also be noted that the terms "comprises," "includes," or any other variations thereof are intended to encompass non-exclusive inclusion, such that a process, method, commodity, or apparatus that includes a series of elements includes not only those elements but also other elements not explicitly listed, or includes elements inherent to such process, method, commodity, or apparatus. In the absence of further limitations, an element defined by the phrase "comprises a ..." does not exclude the presence of other identical elements in the process, method, commodity, or apparatus that includes the element.

[0078] The foregoing description of this specification describes specific embodiments. Other embodiments are within the scope of the appended claims. In some cases, the actions or steps recited in the claims can be performed in an order different from that described in the embodiments and still achieve the desired results. Furthermore, the processes depicted in the accompanying drawings do not necessarily require the specific order shown or the sequential order to achieve the desired results. In certain embodiments, multitasking and parallel processing are also possible or may be advantageous.

[0079] The terms used in one or more embodiments of this specification are for the purpose of describing specific embodiments only and are not intended to limit one or more embodiments of this specification. The singular forms "a," "an," "the," and "the" used in one or more embodiments of this specification and the appended claims are also intended to include plural forms unless the context clearly indicates otherwise. It should also be understood that the term "and / or" used herein refers to and includes any or all possible combinations of one or more associated listed items.

[0080] It should be understood that although the terms first, second, third, etc. may be used to describe various information in one or more embodiments of this specification, such information should not be limited to these terms. These terms are only used to distinguish the same type of information from each other. For example, without departing from the scope of one or more embodiments of this specification, first information may also be referred to as second information, and similarly, second information may also be referred to as first information. Depending on the context, the word "if" as used herein may be interpreted as "when..." or "when..." or "in response to determining."

[0081] The above description is merely a preferred embodiment of one or more embodiments of this specification and is not intended to limit one or more embodiments of this specification. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of one or more embodiments of this specification shall be included in the scope of protection of one or more embodiments of this specification.

Claims

1. A method for aeration of sewage treatment, characterized in that: The aeration system for sewage treatment includes the following steps: Step S1: The motor is adjusted to adjust the collecting cover to the lowest height state, and the control unit obtains monitoring data from the dissolved oxygen sensor and the gas volume control module; Step S2: inputting a preset DO value into the control unit; Step S3: The control unit calculates the input value of the gas volume control module using proportional integral differential according to the preset DO value and the actual monitored value, sends the signal to the gas volume control module for control, and monitors the rate of change of the DO value within the time window; Step S4: The control unit obtains the adjustment motor data. When the collecting cover is at the highest height, the process goes to step S6; otherwise, the process goes to step S5. Step S5: Adjust the motor with a step length a to increase the height of the hood, and jump to step S3 after each adjustment; Step S6, selecting the data corresponding to the regulating motor when the DO value change rate is the largest as the working data; The aeration system for sewage treatment comprises a fixed installation cylinder (2), an adjustment motor (20) is fixedly provided at the upper end of the installation cylinder (2), an adjustment cylinder (3) is rotatably sleeved in the installation cylinder (2), an output shaft of the adjustment motor (20) is fixedly connected to the adjustment cylinder (3), an adjustment rod (22) is sleeved in the adjustment cylinder (3), the adjustment cylinder (3) is threadedly connected to the adjustment rod (22), a support pipe (10) is fixedly connected to the lower end of the adjustment rod (22), a submersible motor (5) is installed on the support pipe (10), an output shaft of the submersible motor (5) is connected to an aeration rod (23), an impeller (9) is provided on the aeration rod (23), and the aeration system is further provided with an oxygenating unit, which is connected to the submersible motor (5) for supplying oxygen to the aeration system; The oxygenation unit includes a blower (18) and an oxygenation pipe (12), one end of the oxygenation pipe (12) is connected to the blower (18), and the oxygenation unit also includes a gas-liquid mixing chamber (6), the gas-liquid mixing chamber (6) is fixedly arranged at the lower end of the submersible motor (5), and the other end of the oxygenation pipe (12) is connected to the gas-liquid mixing chamber (6); The oxygenation tube (12) is a silicone hose. A gas volume control module (13) is provided on the oxygenation tube (12). The gas volume control module (13) is used to control the gas flow rate in the oxygenation tube (12). The lower end of the gas-liquid mixing chamber (6) is fixedly connected to a collecting cover (11) via a reducing unit, and the lower end of the collecting cover (11) is located below the impeller (9); A dissolved oxygen sensor (7) is installed inside the collecting cover (11) or the reducing unit. The dissolved oxygen sensor (7) is used to monitor the DO value of the liquid discharged from the gas-liquid mixing chamber (6).

2. The aeration method for sewage treatment according to claim 1, characterized in that: A plurality of first through holes (16) are provided on the outer shell of the submersible motor (5), and a plurality of second through holes (17) are provided on the gas-liquid mixing chamber (6).

3. The aeration method for sewage treatment according to claim 1, characterized in that: It also includes a control unit (14), which is connected to the dissolved oxygen sensor (7), the regulating motor (20), the submersible motor (5), and the gas volume control module (13) respectively.

4. The aeration method for sewage treatment according to claim 1, characterized in that: The aeration system further comprises a mounting unit (1), one end of the mounting unit (1) being fixedly connected to the mounting cylinder (2), and the other end of the mounting unit (1) being used for connection with the outside world.

5. The aeration method for sewage treatment according to claim 1, characterized in that: In step S3, the proportional-integral-derivative control law is: in, To control the output, it is the gas flow rate value of the gas volume control module; is the proportional gain; is the integration time constant; is the differential time constant; It is the error signal, which is the difference signal between the preset DO value and the actual monitoring value.

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