An intelligent control sewage treatment system and its aeration device

Abstract

This application relates to the field of sewage treatment, and particularly to an intelligent regulation sewage treatment system and its aeration device. An intelligent regulation sewage treatment system is characterized by comprising a multi-parameter monitoring module, a dynamic decision-making module, and an aeration execution module; the multi-parameter monitoring module is used for real-time collecting the actual aeration volume per unit time, COD concentration, ammonia nitrogen concentration, and DO parameter; the dynamic decision-making module is used for analyzing and issuing a control command according to the information of COD concentration, ammonia nitrogen concentration, and DO parameter; the aeration execution module is used for receiving the control command and adjusting the aeration volume per unit time according to the control command. By monitoring the actual aeration volume per unit time, COD concentration, ammonia nitrogen concentration, and DO parameter through the multi-parameter monitoring module, calculating the optimal aeration volume per unit time parameter according to the COD concentration, ammonia nitrogen concentration, and DO parameter, comparing this parameter with the actual aeration volume per unit time, and adjusting the actual aeration volume per unit time to be close to the optimal aeration volume per unit time.

Description

Technical Field

[0001] The present application relates to the field of sewage treatment, and in particular, to an intelligent control sewage treatment system and its aeration device. Background Art

[0002] The sewage treatment system includes an adjustment tank, a neutralization and coagulation tank, a primary sedimentation tank, a sedimentation tank, an anaerobic tank, an aerobic tank, and an MBR tank. Among them, in the aerobic tank, after the anaerobic decomposition greatly degrades the COD, through blast aeration, microorganisms further degrade pollutants such as COD and NH3-N in the sewage under sufficient oxygen supply.

[0003] When the existing sewage treatment system aerates in the aerobic tank, it adjusts the aeration volume only according to the single parameter of DO, ignoring the dynamic coupling relationship between the COD load change and the ammonia nitrogen nitrification demand. Therefore, it is easy to occur that the aeration volume per unit time does not reach the optimal parameter range, resulting in a decrease in the ammonia nitrogen removal rate. Summary of the Invention

[0004] In order to make the aeration volume per unit time within the optimal parameter range, the present application provides an intelligent control sewage treatment system.

[0005] In a first aspect, an intelligent control sewage treatment system provided by the present application adopts the following technical solutions:

[0006] An intelligent control sewage treatment system, characterized in that it includes a multi-parameter monitoring module, a dynamic decision-making module, and an aeration execution module;

[0007] The multi-parameter monitoring module is used to collect the actual aeration volume per unit time, COD concentration, ammonia nitrogen concentration, and DO parameter in real time;

[0008] The dynamic decision-making module is used to analyze and issue a control command according to the COD concentration, ammonia nitrogen concentration, and DO parameter information;

[0009] The aeration execution module is used to receive the control command and adjust the aeration volume per unit time according to the control command.

[0010] By adopting the above technical solutions, the multi-parameter monitoring module monitors the actual aeration volume per unit time, COD concentration, ammonia nitrogen concentration, and DO parameter, calculates the optimal aeration volume per unit time parameter according to the COD concentration, ammonia nitrogen concentration, and DO parameter, compares this parameter with the actual aeration volume per unit time, and adjusts the power of the high-pressure blower through the aeration execution module according to the comparison result to adjust the actual aeration volume per unit time to be close to the optimal aeration volume per unit time.

[0011] Preferably, when the actual aeration volume per unit time is greater than 1.1 times the optimal aeration volume per unit time, the aeration execution module reduces the aeration volume per unit time; when the actual aeration volume per unit time is less than 0.9 times the optimal aeration volume per unit time, the aeration execution module increases the aeration volume per unit time. The optimal aeration volume per unit time Q = the reference aeration volume per unit time * the COD correction parameter * the ammonia nitrogen correction parameter * the DO correction parameter, where the reference aeration volume per unit time = the sewage volume in the aerobic tank * 24. When the COD concentration is less than 800 mg / L, the COD correction parameter = 1; when the COD concentration is greater than or equal to 800 mg / L, the COD correction parameter = 1 + 0.002 * (COD concentration - 800). When the ammonia nitrogen concentration is less than 30 mg / L, the ammonia nitrogen correction parameter = 1; when the ammonia nitrogen concentration is greater than or equal to 30 mg / L, the ammonia nitrogen correction parameter = 1 + 0.015 * (ammonia nitrogen concentration - 30). The DO correction parameter = 1 + (3 - DO value) / 1.5.

[0012] By adopting the above technical solution, the theoretical optimal aeration volume per unit time is obtained by multiplying the reference aeration volume per unit time, the COD correction parameter, the ammonia nitrogen correction parameter, and the DO correction parameter. By comparing the optimal aeration volume per unit time with the actual aeration volume per unit time and adjusting the power of the high-pressure blower according to the comparison result, the actual aeration volume per unit time is made to be within the optimal parameter range.

[0013] In a second aspect, the present application provides an aeration device for the above sewage treatment system, adopting the following technical solution:

[0014] It includes an air inlet pipe, a rotating air outlet connector connected to the air inlet pipe, and an aeration pipe connected to the rotating air outlet connector.

[0015] By adopting the above technical solution, after controlling the aeration volume per unit time within the optimal parameter range, it is also necessary to solve the problem of uniform aeration to avoid the situation where the aeration volume of each local area is within a non-optimal parameter range. In the traditional scheme of arranging a large number of aeration pipes side by side at the bottom of the aerobic tank, since there are many branch pipes of the aeration pipes, the air output of the branch pipes arranged front and back on the main pipe is not uniform. It is easy to have a situation where the branch pipes close to the air inlet direction have a large aeration volume and the branch pipes at the end have a small aeration volume. Moreover, there will also be a large difference in the amount of oxygen received in the areas between the spaced aeration pipes. Although the water flow diffusion driven during aeration can solve part of the problem, there are still large dead corners. In the above scheme, the aeration pipes rotate synchronously during the aeration process, making the aeration volume at each position in the aerobic tank more uniform.

[0016] Preferably, the rotary air outlet connector includes a housing and a rotating member located inside the housing. The interior of the housing is separated by a partition to form an upper cavity and a lower cavity. The intake pipe is connected to the lower cavity. The rotating member is located in the lower cavity and is a rotating body with its upper and lower end faces fitting against the upper and lower side walls of the lower cavity. The rotating member is rotatably connected to the housing through a rotating shaft located at the center of the rotating member. At least three mounting grooves are formed on the side surface of the rotating member, and a sealing piece is arranged in each mounting groove and is movable along the mounting groove. An acting force element for applying a force to move the sealing piece out of the mounting groove is arranged in the mounting groove. The upper and lower sides and the side facing away from the acting force element of the sealing piece are all in sealing contact with the inner wall of the lower cavity. An air outlet hole communicating with the upper cavity is arranged at a position on the partition that is spaced apart from the intake pipe. An axial inner cavity is formed in the rotating shaft, and an air intake hole communicating with the axial inner cavity is formed on the outer side wall of the part of the rotating shaft located in the upper cavity. The aeration pipe is connected to the axial inner cavity and rotates with the rotating shaft.

[0017] By adopting the above technical solution, after the strong wind airflow enters the lower cavity of the housing through the intake pipe, due to the enclosed space formed by the rotating member, the sealing piece, and the housing in the lower cavity, and since the lengths of the two sealing pieces extending out of the mounting groove on both sides are not equal, the pressure difference received by the two sealing pieces will drive the rotating member to rotate. And the air in the enclosed space on the other side connected to the air outlet hole will enter the upper cavity through the air outlet hole, enter the axial inner cavity through the air intake hole communicating with the upper cavity, then enter the aeration pipe through the inner cavity of the disk, and finally be discharged from the aeration holes on the aeration pipe. During the rotation of the rotating member, the aeration pipe will be driven to rotate accordingly. Therefore, the aeration device can evenly supply air to various positions in the aerobic tank and can drive the sewage in the aerobic tank to flow homogenously, avoiding the situation that some areas are insufficiently supplied with oxygen and cannot fully degrade pollutants.

[0018] Preferably, a rotating disk fixedly connected to the rotating shaft is arranged on the housing. A disk inner cavity communicating with the axial inner cavity is formed at the center of the rotating disk. Multiple aeration pipes communicating with the disk inner cavity are fixedly arranged on the outer side surface of the rotating disk.

[0019] By adopting the above technical solution, the rotating shaft is connected to multiple aeration pipes through the rotating disk, so that the multiple aeration pipes rotate together with the rotating shaft.

[0020] Preferably, the aeration pipe extends horizontally outward from the connection with the rotating disk. Multiple aeration holes penetrating the side wall of the aeration pipe in the horizontal direction are formed at a position close to the lower side surface of each aeration pipe. The height positions of all the aeration holes are lower than the height position of the disk inner cavity, and the direction of the airflow ejected from the aeration holes is opposite to the rotation direction of the aeration pipe.

[0021] By adopting the above technical solution, the air outlet holes are arranged in a horizontal direction where the direction of the ejected air flow is opposite to the rotation direction of the aeration pipe, so that the reaction force when the air flow ejects from the air outlet holes can also assist the rotating disk and the aeration pipe to rotate. At the same time, the height positions of the air outlet holes are all lower than the height position of the inner cavity of the disk, so that when there is no aeration, sewage will not enter the inner cavity of the disk through the air outlet holes, and when aerating, the air flow will directly carry out the sewage in the aeration pipe.

[0022] Preferably, the housing is cylindrical, the diameter of the rotating disk is larger than the diameter of the housing, the lower end surface of the rotating disk fits with the upper end surface of the housing, and a circular protrusion that fits with the outer side surface of the housing is formed on the outer ring of the lower end surface of the rotating disk.

[0023] By adopting the above technical solution, the lower end surface of the rotating disk fits with the upper end surface of the housing, and at the same time, the circular protrusion fits with the outer side surface of the housing, so that the rotating disk and the housing can only rotate relative to each other after being limited. And due to having a large fitting surface and a circular side fitting surface, the rotating disk can rotate smoothly without tilting.

[0024] Preferably, the acting force element includes a first magnet fixed at the bottom of the installation groove and a second magnet fixed on the side of the sealing piece facing the bottom surface of the installation groove, and the magnetic poles of the first magnet and the second magnet repel each other.

[0025] By adopting the above technical solution, by arranging the first magnet and the second magnet to provide an outward acting force on the sealing piece, the side surface of the sealing piece can abut against the side wall of the lower cavity to form a sealing surface.

[0026] Preferably, the lower cavity is a cylindrical cavity, the rotating part is cylindrical, and both the upper and lower sides of the installation groove penetrate through the rotating part.

[0027] By adopting the above technical solution, setting the lower cavity and the rotating part to be cylindrical enables the upper and lower end surfaces of the two to form a sealing surface only by fitting. At the same time, both the upper and lower sides of the installation groove penetrate through the rotating part, so that the sealing piece can also abut against the upper and lower sides of the lower cavity through the installation groove to form a sealing surface.

[0028] In summary, the present application includes at least one of the following beneficial technical effects:

[0029] 1. The multi-parameter monitoring module monitors the actual aeration volume per unit time, COD concentration, ammonia nitrogen concentration, and DO parameters, calculates the optimal aeration volume per unit time parameter based on the COD concentration, ammonia nitrogen concentration, and DO parameters, compares this parameter with the actual aeration volume per unit time, and adjusts the power of the high-pressure blower through the aeration execution module according to the comparison result to adjust the actual aeration volume per unit time to be close to the optimal aeration volume per unit time.

[0030] 2. After the strong wind airflow enters the lower cavity of the housing through the intake pipe, due to the enclosed space formed by the rotating part, the sealing piece, and the housing in the lower cavity, since the lengths of the two sealing pieces extending out of the mounting groove on both sides of the enclosed space are not equal, the pressure difference on the two sealing pieces will drive the rotating part to rotate. And the air in the enclosed space connected to the air outlet on the other side will enter the upper cavity through the air outlet, and then enter the shaft inner cavity through the intake hole communicating with the upper cavity, and then enter the aeration pipe through the disk inner cavity, and finally be discharged from the aeration holes on the aeration pipe. During the rotation of the rotating part, the aeration pipe will be driven to rotate accordingly. Therefore, the aeration device will evenly supply air to all positions in the aerobic tank, and can drive the sewage in the aerobic tank to flow homogenously, avoiding the situation that the oxygen supply in some areas is insufficient and the pollutants cannot be fully degraded. Description of the Drawings

[0031] Figure 1 is a schematic structural diagram of the sewage treatment system;

[0032] Figure 2 is a schematic structural diagram of the aeration device;

[0033] Figure 3 is a schematic cross-sectional view of the aeration device;

[0034] Figure 4 is Figure 3 the cross-sectional view at A-A in

[0035] Description of the reference numerals: 1, aerobic tank; 2, intake pipe; 3, rotating air outlet connector; 4, aeration pipe; 5, housing; 6, partition; 7, upper cavity; 8, lower cavity; 9, rotating part; 10, rotating shaft; 11, mounting groove; 12, sealing piece; 13, first magnet; 14, second magnet; 15, air outlet; 16, shaft inner cavity; 17, intake hole; 18, rotating disk; 19, disk inner cavity; 20, annular protrusion; 21, sealing ring; 22, aeration hole; 23, through hole. Detailed Description of the Embodiment

[0036] The following will Figures 1-4 further describe the present application in detail.

[0037] The embodiment of the present application discloses an intelligent regulation sewage treatment system. The "upper", "lower", "left", and "right" used in the embodiment are all schematic relative directions for describing the positional relationship, and are not limitations on the positional relationship.

[0038] As Figure 1As shown in the figure, the sewage treatment system includes an adjustment tank, a neutralization and coagulation tank, a primary sedimentation tank, a sedimentation tank, an anaerobic tank, an aerobic tank 1, and an MBR tank. The adjustment tank is used to adjust the sewage to be homogeneous in quantity and quality. The neutralization and coagulation tank is used for adding medicine for neutralization, stirring, coagulation, and flocculation. The primary sedimentation tank is used for solid-liquid separation and intercepting suspended substances and then concentrating and dewatering them. The anaerobic tank is used for anaerobic decomposition to significantly degrade COD. The aerobic tank 1 is used for blowing air for aeration so that microorganisms can further degrade pollutants such as COD and NH3-N in the sewage under sufficient oxygen supply. The MBR tank is used for filtering, intercepting activated sludge and macromolecular organic matter.

[0039] The sewage treatment system also includes a multi-parameter monitoring module, a dynamic decision-making module, and an aeration execution module. The multi-parameter monitoring module is used to collect the actual aeration volume per unit time, COD concentration, ammonia nitrogen concentration, and DO parameter in real time. The dynamic decision-making module is used to analyze and issue control commands based on the information of COD concentration, ammonia nitrogen concentration, and DO parameter. The aeration execution module is used to receive the control command and adjust the aeration volume per unit time according to the control command.

[0040] The multi-parameter monitoring module includes an air flow meter for monitoring air flow, a COD sensor, an ammonia nitrogen concentration sensor, and a DO sensor. When the value of the aeration volume per unit time measured by the air flow meter is greater than 1.1 times the optimal aeration volume per unit time, the power of the high-pressure blower is reduced; when the value measured by the air flow meter is less than 0.9 times the optimal aeration volume per unit time, the power of the high-pressure blower is increased.

[0041] Q (optimal aeration volume per unit time, unit: cubic meters per hour) = q (reference aeration volume per unit time) * K1 (COD correction parameter) * K2 (ammonia nitrogen correction parameter) * K3 (DO correction parameter)

[0042] q = sewage volume of aerobic tank 1 * 24, unit: cubic meters per hour.

[0043] When the COD concentration is less than 800 mg / L, K1 = 1; when the COD concentration is greater than or equal to 800 mg / L, K1 = 1 + 0.002 * (COD concentration - 800).

[0044] When the ammonia nitrogen concentration is less than 30 mg / L, K2 = 1; when the ammonia nitrogen concentration is greater than or equal to 30 mg / L, K2 = 1 + 0.015 * (ammonia nitrogen concentration - 30).

[0045] K3 = 1 + (3 - DO value) / 1.5.

[0046] As Figure 2 As shown in the figure, the aeration execution module includes a high-pressure blower and an aeration device. The aeration device includes an air inlet pipe 2, a rotating air outlet connector 3 connected to the air inlet pipe 2, and an air distribution pipe 4 connected to the rotating air outlet connector 3.

[0047] As Figure 3 and Figure 4 shown, the rotating air outlet connector 3 includes a cylindrical housing 5. The axis of the housing 5 is in the vertical direction. The housing 5 is divided by a partition 6 to form an upper cavity 7 and a lower cavity 8, and both the upper cavity 7 and the lower cavity 8 are cylindrical cavities. A cylindrical rotating member 9 is installed in the lower cavity 8. A rotating shaft 10 fixedly connected to the rotating member 9 extends vertically upward through the housing 5, and the rotating member 9 is rotatably connected to the housing 5. Bearings are provided at the positions in the partition 6 that cooperate with the rotating shaft 10. The upper and lower end faces of the rotating member 9 are in sealing contact with the upper and lower side walls of the lower cavity 8. The rotating shaft 10 is located at the center of the rotating member 9 and is offset from the center of the lower cavity 8, so that only one side of the rotating member 9 is in contact with the inner side wall of the lower cavity 8. Five mounting grooves 11 extending toward the center of the rotating member 9 are evenly formed on the side surface of the rotating member 9. The upper and lower sides of each mounting groove 11 penetrate through the rotating member 9, and sealing sheets 12 capable of moving along the length direction of the mounting groove 11 are provided in the mounting grooves 11. The upper and lower side surfaces of the sealing sheets 12 are in abutting contact with the upper and lower side walls of the lower cavity 8 for sealing. A first magnet 13 is fixed at the bottom of the mounting groove 11, and a second magnet 14 is mounted on the side of the sealing sheet 12 facing the bottom surface of the mounting groove 11 in the corresponding mounting groove 11. The magnetic poles of the second magnet 14 and the first magnet 13 repel each other, so that the sealing sheet 12 is subjected to a force moving outward from the mounting groove 11. In other embodiments, springs or other elements can also be used to replace the first magnet 13 and the second magnet 14 as the force elements applying forces to the sealing sheet 12.

[0048] As Figure 3 and Figure 4 shown, the intake pipe 2 is connected to the lower cavity 8 from the side of the housing 5. The connection position of the intake pipe 2 and the lower cavity 8 is close to the contact position between the rotating member 9 and the inner side wall of the lower cavity 8. An air outlet hole 15 is formed in the partition 6 at a position close to the contact position between the rotating member 9 and the inner side wall of the lower cavity 8. The air outlet hole 15 is located on the other side of the intake pipe 2 relative to the contact position between the rotating member 9 and the inner side wall of the lower cavity 8. When air enters the lower cavity 8 through the intake pipe 2 and is discharged through the air outlet hole 15, the rotating member 9 will be driven to rotate around the axis.

[0049] As Figure 3 and Figure 4As shown in the figure, a shaft inner cavity 16 is formed inside the rotating shaft 10, and an air inlet hole 17 communicating with the shaft inner cavity 16 is formed on the outer side wall of the part of the rotating shaft 10 located inside the upper cavity 7. A rotating disk 18 fitting the upper end face of the housing 5 is installed above the housing 5, and a disk inner cavity 19 communicating with the shaft inner cavity 16 is formed at the center of the rotating disk 18. The rotating shaft 10 is welded to the rotating disk 18 in a state where its upper end face abuts against the upper side wall of the disk inner cavity 19, and a through hole 23 is opened at a position near the upper end on the side surface of the rotating shaft 10 to connect the shaft inner cavity 16 and the disk inner cavity 19. The height dimension of the through hole 23 is less than half of the height dimension of the disk inner cavity 19. The diameter of the rotating disk 18 is larger than the diameter of the housing 5, and a circular protrusion 20 fitting the outer side surface of the housing 5 is formed on the outer ring of the lower end face of the rotating disk 18. A sealing ring 21 is embedded on the outer side surface of the housing 5, and a water-proof sealing surface is formed by the cooperation of the sealing ring 21 and the circular protrusion 20 so that the lubricating oil between the rotating disk 18 and the outer shell will not be impregnated by sewage. Multiple aeration pipes 4 are fixed on the outer side surface of the rotating disk 18. The aeration pipes 4 extend outward in the horizontal direction starting from the connection with the rotating disk 18, and the lower side surface of the aeration pipes 4 is flush with the circular protrusion 20. A plurality of aeration holes 22 extending horizontally through the side wall of the aeration pipes 4 are uniformly formed at positions near the lower side surface of each aeration pipe 4. The height positions of all the aeration holes 22 are lower than the height position of the disk inner cavity 19, and the direction of the airflow ejected from the aeration holes 22 is opposite to the rotation direction of the aeration pipes 4.

[0050] Specific working process of the sewage treatment system:

[0051] (1) Sewage is homogenized and equalized in the regulating tank and then transported to the neutralization and coagulation tank by a sewage pump.

[0052] (2) After being neutralized, stirred, coagulated, and flocculated by the dosing facility, it enters the primary sedimentation tank.

[0053] (3) Through solid-liquid separation in the primary sedimentation tank, the suspended matter is intercepted in the sedimentation tank sludge hopper, and the supernatant enters the next process. The sludge at the bottom of the sedimentation tank is discharged to the sludge tank for concentration and dehydration.

[0054] (4) The supernatant flowing to the oxidation tank is subjected to oxidation treatment and then discharged to the anaerobic tank. Through the anaerobic action, the COD is greatly degraded, reducing the subsequent treatment pressure.

[0055] (5) Suspended combined fillers are suspended in the aerobic tank 1, and air is blown and aerated by a high-pressure blower. Under sufficient oxygen supply, microorganisms degrade the pollutants in the sewage, including COD and NH3-N.

[0056] (6) After the reaction in the aerobic tank 1, the mixed liquid overflows into the MBR tank, the clear water is discharged externally by the MBR water production pump, and the sludge mixed liquid flows back to the front-end anaerobic tank and the aerobic tank 1. Excessive excess sludge can be discharged to the sludge tank for concentration and dehydration.

[0057] During the aeration process of the aerobic tank 1, the dynamic decision-making module calculates the optimal aeration volume per unit time and compares it with the actual aeration volume per unit time based on the COD concentration, ammonia nitrogen concentration, and DO parameter information, and adjusts the power of the high-pressure blower according to the comparison result.

[0058] The strong wind airflow blown by the high-pressure blower enters the lower cavity 8 of the rotary air outlet connector 3 through the air inlet pipe 2. After the strong wind airflow enters the enclosed space formed by the rotary member 9, the sealing piece 12, and the housing 5 in the lower cavity 8, since the lengths of the two sealing pieces 12 on both sides enclosing the enclosed space extending out of the mounting groove 11 are not equal, the pressure difference received by the two sealing pieces 12 on both sides will drive the rotary member 9 to rotate. And the air in the enclosed space on the other side connected to the air outlet hole 15 will enter the upper cavity 7 through the air outlet hole 15, and then enter the shaft inner cavity 16 through the air inlet hole 17 communicated with the upper cavity 7, and then enter the aeration pipe 4 through the disk inner cavity 19, and finally be discharged from the aeration holes 22 on the aeration pipe 4. During the rotation of the rotary member 9, it will drive the aeration pipe 4 to rotate accordingly. Therefore, the aeration device will evenly supply air to all positions in the aerobic tank 1, and can drive the sewage in the aerobic tank 1 to flow homogeneously, avoiding the situation that the oxygen supply in some areas is insufficient and the pollutants cannot be fully degraded.

[0059] The above are all preferred embodiments of the present application, and do not limit the protection scope of the present application accordingly. Therefore, all equivalent changes made according to the structure, shape, and principle of the present application should be covered within the protection scope of the present application.

Claims

1. An intelligent regulation sewage treatment system, characterized in that, It includes a multi-parameter monitoring module, a dynamic decision-making module, an aeration execution module, and an aeration device; The multi-parameter monitoring module is used to collect the actual aeration volume per unit time, COD concentration, ammonia nitrogen concentration, and DO parameter in real time; The dynamic decision-making module is used to analyze and issue control commands based on the COD concentration, ammonia nitrogen concentration, and DO parameter information; The aeration execution module is used to receive the control command and adjust the aeration volume per unit time according to the control command; The aeration device includes an air inlet pipe (2), a rotating air outlet connecting piece (3) connected to the air inlet pipe (2), and an aeration pipe (4) connected to the rotating air outlet connecting piece (3). The rotating air outlet connecting piece (3) includes a housing (5) and a rotating member (9) located inside the housing (5). The interior of the housing (5) is separated by a partition plate (6) to form an upper cavity (7) and a lower cavity (8). The air inlet pipe (2) is communicated with the lower cavity (8). The rotating member (9) is located in the lower cavity (8), and the rotating member (9) is a rotating body with its upper and lower end faces fitting the upper and lower side walls of the lower cavity (8). The rotating member (9) is rotatably connected to the housing (5) through a rotating shaft (10) located at the center of the rotating member (9). The rotating shaft (10) is located at the center of the rotating member (9) and deviates from the center position of the lower cavity (8). At least three mounting grooves (11) are formed on the side surface of the rotating member (9). A sealing piece (12) movable along the mounting groove (11) is provided in each mounting groove (11). An acting force element for applying a force to move the sealing piece (12) out of the mounting groove (11) is provided in the mounting groove (11). The upper and lower sides and the side facing away from the acting force element of the sealing piece (12) are in sealing contact with the inner wall of the lower cavity (8). The strong air flow enters the lower cavity (8) of the housing (5) through the air inlet pipe (2) and enters the enclosed space formed by the rotating member (9), the sealing piece (12), and the housing (5). The lengths of the two sealing pieces (12) enclosing the enclosed space extending out of the mounting groove (11) are not equal. An air outlet hole (15) communicated with the upper cavity (7) is provided at a position on the partition plate (6) spaced apart from the air inlet pipe (2). An axial inner cavity (16) is formed in the rotating shaft (10). An air inlet hole (17) communicated with the axial inner cavity (16) is formed on the outer side wall of the part of the rotating shaft (10) located in the upper cavity (7). The aeration pipe (4) is communicated with the axial inner cavity (16) and rotates with the rotating shaft (10).

2. The sewage treatment system according to claim 1, characterized in that, When the actual aeration volume per unit time is greater than 1.1 times the optimal aeration volume per unit time, the aeration execution module reduces the aeration volume per unit time. When the actual aeration volume per unit time is less than 0.9 times the optimal aeration volume per unit time, the aeration execution module increases the aeration volume per unit time; The optimal aeration volume per unit time Q = reference aeration volume per unit time * COD correction parameter * ammonia nitrogen correction parameter * DO correction parameter, where the reference aeration volume per unit time = sewage volume of the aerobic tank (1) * 24; When the COD concentration is less than 800 mg / L, the COD correction parameter = 1; when the COD concentration is greater than or equal to 800 mg / L, the COD correction parameter = 1 + 0.002 * (COD concentration - 800); when the ammonia nitrogen concentration is less than 30 mg / L, the ammonia nitrogen correction parameter = 1; when the ammonia nitrogen concentration is greater than or equal to 30 mg / L, the ammonia nitrogen correction parameter = 1 + 0.015 * (ammonia nitrogen concentration - 30); the DO correction parameter = 1 + (3 - DO value) / 1.

5.

3. The sewage treatment system according to claim 1, characterized in that, A rotating disk (18) fixedly connected to the rotating shaft (10) is provided on the housing (5). A disk inner cavity (19) communicating with the inner cavity (16) of the shaft is formed at the center of the rotating disk (18). A plurality of aeration pipes (4) communicating with the disk inner cavity (19) are fixedly arranged on the outer side surface of the rotating disk (18).

4. The sewage treatment system according to claim 3, characterized in that, The aeration pipes (4) extend outward horizontally from the connection with the rotating disk (18). A plurality of aeration holes (22) penetrating the side wall of the aeration pipe (4) horizontally are formed at positions near the lower side surface of each aeration pipe (4). The height positions of all the aeration holes (22) are lower than the height position of the disk inner cavity (19), and the direction of the air flow ejected from the aeration holes (22) is opposite to the rotation direction of the aeration pipe (4).

5. The sewage treatment system according to claim 3, characterized in that, The housing (5) is cylindrical. The diameter of the rotating disk (18) is larger than the diameter of the housing (5). The lower end surface of the rotating disk (18) is attached to the upper end surface of the housing (5). A circular protrusion (20) attached to the outer side surface of the housing (5) is formed on the outer ring of the lower end surface of the rotating disk (18).

6. The sewage treatment system according to claim 1, characterized in that, The acting force element includes a first magnet (13) fixed at the bottom of the installation groove (11) and a second magnet (14) fixed on the side of the sealing sheet (12) facing the bottom surface of the installation groove (11). The magnetic poles of the first magnet (13) and the second magnet (14) repel each other.

7. The sewage treatment system according to claim 1, characterized in that, The lower cavity (8) is a cylindrical cavity. The rotating member (9) is cylindrical. The installation groove (11) penetrates through the rotating member (9) on both the upper and lower sides.

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