Variable-volume AOA process treatment system and method

Abstract

The present invention relates to the technical field of AOA process treatment. Disclosed are a variable-volume AOA process treatment system and method. The system comprises an anaerobic zone, an aerobic zone and an anoxic zone which are sequentially in communication with one another, at least part of the anaerobic zone and / or the anoxic zone forming an adjustment zone; and the system further comprises an aeration device configured to create an oxygenated environment in the adjustment zone. By providing the adjustment zone in the anaerobic zone and the anoxic zone, and by means of the aeration device regulating the oxygenated environment in the adjustment zone, the volume of the aerobic zone is adjustable. Compared with the prior art, the AOA process treatment system of the present invention can realize the adjustability of the volumes of the anaerobic zone, the aerobic zone and the anoxic zone. Thus, the volumes of the three zones can be dynamically adjusted on the basis of conditions such as the quality, volume and temperature of influent water during operation, thereby reducing the risk of ammonia nitrogen exceeding the standard during wastewater treatment.

Description

A variable volume AOA process system and method Technical Field

[0001] This invention relates to the field of AOA process technology, and in particular, to a variable-volume AOA process system and method. Background Technology

[0002] The AOA (Anaerobic-Oxygen-Oriented) process is a wastewater treatment process consisting of three reaction zones: anaerobic, aerobic, and anoxic. Its key feature is the use of a dual sludge recirculation technology, achieving highly efficient nitrogen and phosphorus removal. Specifically: In the anaerobic zone (pre-A zone), microorganisms convert organic matter in the influent into an internal carbon source and release phosphate. In the aerobic zone (O zone), microorganisms oxidize ammonia nitrogen to nitrate, simultaneously absorbing phosphate and synthesizing glycogen or polyphosphate from the internal carbon source. In the anoxic zone (post-A zone), microorganisms reduce nitrate to nitrogen gas and utilize the internal carbon source as an electron donor to complete energy metabolism.

[0003] Due to the slow rate of endogenous metabolism, in current AOA (Anaerobic-Aerobic) processes, the anoxic zone occupies a significant portion of the total volume (generally over 40% of the total tank volume). Furthermore, wastewater treatment plants using AOA processes typically employ fixed-volume AOA, meaning the volumes of the anaerobic, aerobic, and anoxic zones are predetermined during design. This prevents dynamic adjustments based on influent quality, quantity, and temperature during operation. Consequently, the risk of exceeding ammonia nitrogen limits under shock loads and off-design conditions increases. For example, a wastewater treatment plant designed for a 20°C influent temperature may experience insufficient aerobic zone volume when the actual influent temperature is 15°C, thus increasing the risk of ammonia nitrogen exceeding standards. Technical issues

[0004] The first objective of this invention is to overcome the shortcomings of the prior art and provide a variable volume AOA process system. Technical solutions

[0005] The first objective of this invention is achieved through the following technical solution:

[0006] A variable-volume AOA process system includes an anaerobic zone, an aerobic zone, and an anoxic zone connected in sequence. The anaerobic zone and / or the anoxic zone at least partially constitute a regulating zone. The system also includes an oxygenation device for creating an oxygenation environment in the regulating zone.

[0007] The regulating zone and the aerobic zone are arranged adjacent to each other through a partition wall. The partition wall has an exchange port, which can be selectively opened and closed by an opening and closing device. The oxygenation device includes a pusher installed on the partition wall, which is used to push water in the aerobic zone into the regulating zone through the exchange port.

[0008] The adjustment zone and the aerobic zone are not adjacent to each other, and the oxygenation device includes an aeration element disposed in the adjustment zone.

[0009] The anaerobic zone, the aerobic zone, and the anoxic zone are formed in the same tank. The oxygenation device includes aeration elements installed in the regulating zone and the aerobic zone. At least one movable partition is movably installed in the tank.

[0010] A stirrer is also installed in the adjustment zone.

[0011] The oxygenation device includes a disc aerator, which is embedded in the surface of the pool. A connecting ring is provided on the top side of the disc aerator, and an installation ring is spring-loaded on the outer wall of the connecting ring. Several interlocking sealing pieces are arranged side by side inside the installation ring along the moving direction of the movable partition, and the sealing pieces are adapted to be able to spring between a first position and a second position.

[0012] At the first position, the sealing piece opens the mounting ring, allowing airflow to be connected to the outside through the corresponding sealing piece;

[0013] In the second position, the sealing piece seals the mounting ring to cut off the flow path between the corresponding sealing piece and the outside world;

[0014] The connecting ring is also provided with a locking mechanism, which can lock the sealing piece so that the sealing piece is kept in the second position;

[0015] The bottom sidewall of the movable partition is provided with a guide ramp.

[0016] The locking mechanism includes a locking rod that passes through the connecting ring and is capable of springing. The locking rod includes a locking end that extends into the connecting ring and a driving end opposite to the locking end. The bottom of the mounting ring is provided with a first driving ramp, and the driving end is provided with a corresponding second driving ramp. When the mounting ring is pressed down, the first driving ramp pushes the second driving ramp, so that the locking end is pushed to the locking position. The sealing plate is provided with a locking part. When the sealing plate enters the second position, the locking part is mechanically locked with the locking end.

[0017] The locking part and the locking end are locked together by a snap-fit ​​structure.

[0018] The blocking plate includes a first side near the aerobic zone and a second side opposite to the first side. The second side is provided with a protrusion for driving the adjacent blocking plate to bounce downward. The blocking plate near the aerobic zone is a movable blocking plate. The locking mechanism is not provided at the position opposite to the movable blocking plate of the connecting ring.

[0019] The second objective of this invention is to overcome the shortcomings of the prior art and provide an AOA process method.

[0020] The second objective of this invention is achieved through the following technical solution:

[0021] An AOA process treatment method includes the aforementioned variable-volume AOA process treatment system, wherein both the anaerobic zone and the anoxic zone constitute a regulating zone, and further includes the following steps:

[0022] S1. Obtain raw water quality and quantity data;

[0023] S2. Input the data obtained in S1 into the water quality model to predict the effluent water quality data, and compare it with the operation control water quality target.

[0024] S3. When it is predicted that the system will meet the water quality control target without adding chemicals, no adjustment operation will be performed.

[0025] S4. When it is predicted that the ammonia nitrogen level will not meet the water quality control target without the addition of chemicals, the adjustment zone of the anaerobic zone in the model will be adjusted to an oxygen-bearing environment, and the prediction will be made again.

[0026] S401, if the prediction meets the standard, the corresponding oxygenation device will perform the oxygenation action;

[0027] S402. If the prediction fails to meet the standard, compare the predicted total nitrogen value to see if it is at a low level. If it is at a low level, adjust the regulation zone of the anoxic zone in the model to an oxygen-providing environment. If it is at a high level, adjust the regulation zone of the anaerobic zone in the model to an oxygen-providing environment.

[0028] S5. Repeat the prediction action of S4, and make judgments based on the steps of S401 and S402 until the ammonia nitrogen meets the water quality control target.

[0029] S6. When ammonia nitrogen meets the standard but total nitrogen does not, the system detects whether there is an adjustment zone in the anaerobic zone that can be adjusted to an oxygen-bearing environment; if so, the adjustment zone is adjusted to an oxygen-bearing environment, and the adjustment zone of the same volume of the anoxic zone is restored to an anoxic environment until the total nitrogen meets the standard.

[0030] S7. When the total nitrogen in S6 fails to meet the standard, the anoxic volume of the anoxic zone is maintained, while the regulating zone in the anaerobic zone is gradually adjusted to an oxygenated environment. If the oxygenated environment volume of the wastewater treatment is still insufficient, the regulating zone in the anoxic zone is gradually adjusted to an oxygenated environment to ensure that the ammonia nitrogen meets the standard.

[0031] S8. After the ammonia nitrogen in S7 reaches the standard, a carbon source is added to the initial section of the anoxic zone, and the amount added is gradually increased until the total nitrogen reaches the standard. Beneficial effects

[0032] The beneficial effects of this invention are:

[0033] 1. By setting up adjustment zones within the anaerobic and anoxic zones, and by regulating the oxygenation environment of the adjustment zones through an oxygenation device, the volume of the aerobic zone is adjustable. Compared with existing technologies, the AOA process treatment system of this invention can achieve adjustable volumes of the anoxic, aerobic, and anoxic zones. Therefore, during operation, the volumes of the three zones can be dynamically adjusted according to influent water quality, quantity, temperature, and other conditions, thereby reducing the risk of ammonia nitrogen exceeding the standard in wastewater treatment.

[0034] 2. The oxygenation environment can be easily adjusted between adjacent areas through the cooperation of the exchange port and the propulsion component. Furthermore, the volume of the oxygenation environment can be easily adjusted by controlling the power of the propulsion component.

[0035] 3. By installing aeration and mixing components in the regulating zone, the oxygenation environment within the regulating zone can be altered, thereby enabling convenient switching of the wastewater treatment mode in the regulating zone.

[0036] 4. By using movable partitions to achieve continuous volume changes between the three zones, the system's applicability to treating wastewater of different qualities is increased. Furthermore, it facilitates precise control of the volume between the three zones, maximizing the effectiveness and accuracy of wastewater treatment.

[0037] 5. A water quality model is used to predict the wastewater to be treated, and based on the prediction results, the volume of the three zones is selected without chemical addition, and the dosage is precisely controlled when adjusting the volume of the three zones alone cannot achieve the treatment target. Compared with existing technologies, the AOA process treatment method of this invention can achieve wastewater treatment without chemical addition or with minimal chemical addition by adjusting the volume of the three zones. Attached Figure Description

[0038] Figure 1 is a schematic diagram of an embodiment where the oxygen supply device is a propulsion component;

[0039] Figure 2 is a schematic diagram of an embodiment where the oxygenation device is an aeration element;

[0040] Figure 3 is a schematic cross-sectional view of the disc aerator.

[0041] Figure 4 is an enlarged view of part A in Figure 3;

[0042] Figure 5 is a schematic diagram of the orthographic projection structure of the sealing plate;

[0043] Figure 6 is a schematic diagram of the locking mechanism;

[0044] Figure 7 is a schematic diagram of the movable baffle.

[0045] Reference numerals: 1. Anaerobic zone; 2. Aerobic zone; 3. Anoxic zone; 4. Adjustment zone; 5. Oxygenation device; 6. Exchange port; 7. Flow propulsion component; 8. Movable baffle; 10. Disc aerator; 11. Connecting ring; 12. Mounting ring; 13. Sealing plate; 14. Locking mechanism; 15. Guide slope; 16. Locking rod; 17. Locking end; 18. Driving end; 19. First driving slope; 20. Second driving slope; 21. Locking part; 22. First side; 23. Second side; 24. Protrusion; 25. Tank body; 26. Movable sealing plate; 27. Movable baffle. Embodiments of the present invention

[0046] The technical solution of the present invention will be clearly and completely described below with reference to the embodiments. 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. Example

[0047] As shown in Figures 1 to 7, a variable-volume AOA process treatment system, similar to existing technologies, includes an anaerobic zone 1, an aerobic zone 2, and an anoxic zone 3 connected in sequence. The three zones, as described below, can be arranged adjacently or non-adjacently depending on factors such as the different treatment processes. This disclosure does not impose any restrictions on whether the three zones are arranged adjacently. The difference lies in that, to achieve adjustable volume of the aerobic zone 2, this disclosure configures at least a portion of the anaerobic zone 1 and / or the anoxic zone 3 as an adjustment zone 4, and also includes an oxygenation device 5 for creating an oxygenated environment within the adjustment zone 4.

[0048] It is understandable that when the water quality conditions of the wastewater to be treated change, an oxygenation environment can be formed in the adjustment zone 4 of the anaerobic zone 1 and / or the anoxic zone 3 by the oxygenation device 5, thereby changing the overall aerobic environment volume of the system and thus meeting the AOA process treatment requirements of wastewater with different water quality.

[0049] As shown in Figure 1, in some embodiments, the three regions are arranged adjacent to each other. For example, the regulating region 4 can be arranged adjacent to the aerobic region 2 through a fixed partition wall, that is, the regulating region 4 is formed by two partition walls. The oxygenation device 5 includes a flow propulsion element 7 installed on the partition wall. The partition wall also has a flow exchange port 6, which can be selectively opened and closed by an opening and closing element. For example, the opening and closing element can be an electric gate, and the flow propulsion element 7 can preferably include a flow propulsion agitator.

[0050] When the regulating zone 4 needs to be used in the non-aerobic zone 2, the opening and closing device can be kept closed to the exchange port 6, at which time the system is at the minimum aerobic volume. When it is necessary to increase the aerobic volume of the system, the opening and closing device can be controlled to open the exchange port 6, and then the pusher 7 can push the water in the aerobic zone 2 into the regulating zone 4 through the exchange port 6, thereby realizing the formation of the oxygenation environment in the regulating zone 4 and ultimately realizing the regulation of the aerobic volume of the system.

[0051] As shown in Figure 7, in a preferred example, several movable baffles 27 can be arranged between the two partition walls, and the movable baffles 27 are adapted to slide between the two partition walls. Therefore, multiple sub-regulating chambers can be formed between the movable baffles 27. For example, a flow-propelling element 7 can be arranged in each sub-regulating chamber, and the oxygenation environment of the sub-regulating chamber can be switched by controlling the opening and closing of the flow-propelling element 7. Thus, by activating different numbers of sub-regulating chambers, the volume of the system's oxygenation environment can be finely adjusted. The specific sliding adjustment method of the movable baffles 27 can be found in the sliding adjustment method of the movable partition 8, which will be described below.

[0052] For example, the partition wall on the side away from the aerobic zone 2 can be removed. In this case, the volume of the oxygenation environment in the regulating zone 4 can be easily adjusted by adjusting the propulsion power of the propulsion component 7. In other words, the oxygenation environment of the regulating zone 4 will no longer be limited by the fixed volume separated by the two partition walls.

[0053] In some embodiments, the three zones are not adjacent, and the aeration device 5 may include an aeration element disposed within the regulating zone 4 to create an oxygenated environment within the regulating zone 4. For example, a stirrer (not shown) may also be disposed within the regulating zone 4. When the regulating zone 4 needs to be used in the non-aerobic zone 2, the stirrer can be turned on to stop the aeration element; when the regulating zone 4 needs to be used in the aerobic zone 2, the aeration element can be turned on and the stirrer can be turned off or its stirring power reduced. It can be understood that the switching of the regulating zone 4's usage mode can be achieved conveniently and quickly through the cooperation of the aeration element and the stirrer.

[0054] As shown in Figure 2, in some embodiments, the three zones are preferably arranged within the same tank 25, and the aeration device 5 includes aeration elements disposed in the regulating zone 4 and the aerobic zone 2. Furthermore, at least one movable baffle 8 is movably disposed within the tank 25. For example, two movable baffles 8 are movably disposed within the tank 25. By adjusting the movement of the two movable baffles 8, continuous volume changes in the three zones can be achieved, thereby increasing the system's applicability to treating wastewater of different qualities. The movable baffle 8 can be moved using any type of moving mechanism, such as a telescopic rod ejection mechanism or a screw ejection mechanism. Alternatively, it can be moved manually by pushing the movable baffle 8.

[0055] For example, a guide rail (not shown) can be installed inside the pool body 25, and the movable partition 8 can be slidably adapted to the guide rail, thereby realizing the movable partition 8 relative to the pool body 25.

[0056] As shown in Figures 2 and 3, the aeration element preferably includes a disc aerator 10, and the disc aerator 10 is adapted to be embedded in the surface of the tank body 25 so as not to interfere with the movement of the baffle. It is understood that when the movable baffle 8 moves to change the treatment volume between different zones, in order to ensure the accuracy of the volume ratio between different zones and improve the effect and precision of wastewater treatment, the movable baffle 8 may stop above the aeration element. At this time, the aeration element needs to be closed to prevent unwanted oxygen from entering the anaerobic zone 1 and / or the anoxic zone 3. However, this will cause uneven aeration on the side of the aerobic zone 2 near the movable baffle 8, which will reduce the treatment performance and efficiency of wastewater in the aerobic zone 2.

[0057] To address the aforementioned technical issues, in this disclosure, a connecting ring 11 is adapted to the top side of the disc aerator 10, and an installation ring 12 is spring-loaded onto the outer wall of the connecting ring 11. Within the installation ring 12, several interlocking sealing pieces 13 are arranged side-by-side along the moving direction of the movable partition 8, and the sealing pieces 13 are also adapted to be spring-loaded between a first position and a second position.

[0058] For example, in the first position, the sealing plate 13 is pushed upward out of the mounting ring 12, and is adapted to allow the airflow ejected from the disc aerator 10 to communicate with the outside through the sealing plate 13 in the first position. That is, in the natural state of the sealing plate 13, the airflow of the disc aerator 10 can flow into the tank body 25 through the mounting ring 12 to achieve aeration.

[0059] In the second position, for example, when the sealing piece 13 is compressed into the mounting ring 12, the flow path of the sealing piece 13 communicating with the outside is blocked and cut off by the inner wall of the mounting ring 12.

[0060] More specifically, the connecting ring 11 is also provided with a locking mechanism 14, which can lock and hold the sealing piece 13 in the second position. In addition, a guide ramp 15 is constructed on the bottom side wall of the movable partition 8.

[0061] Therefore, when the movable baffle 8 moves to change the aerobic volume of the system, as the movable baffle 8 gradually faces the disc aerator 10, the movable baffle 8 will push the sealing plate 13 down into the second position through the guide slope 15. For example, at this time, the locking mechanism 14 can lock the sealing plate 13. When the movable baffle 8 stops above the disc aerator 10, for example, the sealing plate 13 on the side of the anaerobic zone 1 or anoxic zone 3 defined by the movable baffle 8 remains in the second position, while the sealing plate 13 on the side of the aerobic zone 2 defined by the movable baffle 8 remains in the first position. Thus, the oxygen sprayed by the disc aerator 10 can enter the aerobic zone 2 side through the sealing plate 13 in the first position, so as to achieve uniform oxygen supply at the edge of the aerobic zone 2.

[0062] For example, the locking mechanism 14 may preferably include a locking rod 16 that passes through the connecting ring 11 and is capable of springing, and the locking rod 16 specifically includes a locking end 17 extending into the connecting ring 11 and a driving end 18 opposite to the locking end 17. In addition, the bottom of the mounting ring 12 is constructed with a first driving ramp 19, and the driving end 18 is correspondingly constructed with a second driving ramp 20. As the moving partition 8 gradually faces the disc aerator 10, the moving partition 8 will first press down on the mounting ring 12. At this time, the mounting ring 12 can push the locking end 17 to the locking position through the cooperation of the first driving ramp 19 and the second driving ramp 20. As the moving partition 8 continues to move forward, the sealing plate 13 will be pressed down to the second position, and the locking part 21 will be mechanically locked with the locking end 17.

[0063] As shown in Figure 5, for ease of description, the sealing plate 13 can be defined as having a first side 22 near the aerobic zone 2 and a second side 23 opposite to the first side 22. The second side 23 is provided with a protrusion 24 for causing adjacent sealing plates 13 to spring downwards; for example, the first side 22 has a groove for engaging the protrusion 24. Correspondingly, the sealing plate 13 closest to the aerobic zone 2 is a movable sealing plate 26, and no locking mechanism 14 is provided at the point where the connecting ring 11 and the movable sealing plate 26 are located.

[0064] It is understandable that when the movable partition 8 moves from the anaerobic zone 1 or the anoxic zone 3 to the aerobic zone 2, that is, when the movable partition 8 moves from the second side 23 to the first side 22, since the sealing piece 13 pressed by the movable partition 8 is not restricted by the protrusion 24 on the adjacent sealing piece 13, the sealing piece 13 will be normally pressed to the second position and mechanically locked by the locking mechanism 14. When the movable partition 8 stops on the disc aerator 10, the oxygen sprayed by the disc aerator 10 can enter the aerobic zone 2 through the sealing piece 13 in the first position.

[0065] If the movable baffle 8 is not stationary on the disc aerator 10, as the movable baffle 8 disengages from the mounting ring 12, the mounting ring 12 will return to its natural upward state. At this time, the first driving inclined surface 19 releases its position restriction on the second driving inclined surface 20. Subsequently, the locking rod 16 returns to its natural state, causing the locking end 17 to enter the unlocked position. This allows several sealing plates 13 to return to their first position, bringing the disc aerator 10 back to its initial state. For example, the need for oxygenation in the aerator 10 can be controlled according to the actual treatment process, meaning the aerator 10 can be directly controlled to be in a closed state.

[0066] When the movable partition 8 moves from the aerobic zone 2 to the anaerobic zone 1 or the anoxic zone 3, that is, when the moving partition 8 moves from the first side 22 to the second side 23, as the movable partition 8 presses down on the mounting ring 12 and the movable sealing plate 26, the movable sealing plate 26 will drive all the sealing plates 13 downward into the second position locking mechanism 14 through the protrusion 24 to achieve mechanical locking. At this time, at least the following three situations can occur:

[0067] 1. The movable baffle 8 is just above the movable sealing plate 26. At this time, the disc aerator 10 is in a closed state. Then, the oxygenation of the disc aerator 10 can be stopped.

[0068] 2. When the movable partition 8 stops above any of the sealing plates 13, the movable sealing plate 26 will return to the first position because it is not locked by the locking mechanism 14. At this time, the oxygen sprayed by the disc aerator 10 can enter the aerobic zone 2 side through the movable sealing plate 26.

[0069] 3. The movable baffle 8 passes over the disc aerator 10. At this time, the disc aerator 10 returns to the initial state described above. Since it is located in the aerobic zone 2, the aeration state of the disc aerator 10 can be maintained.

[0070] In some examples, the locking part 21 and the locking end 17 can preferably be locked together by a snap-fit ​​structure. For example, the locking part 21 and the locking end 17 can be configured as mutually cooperating claw shapes. When the mounting ring 12 is pressed down to drive the locking end 17 into the locked position, the locking part 21 will engage with the locking end 17 as the sealing piece 13 is pressed down to achieve the above-mentioned mechanical locking action. Example

[0071] An AOA process treatment method includes the variable volume AOA process treatment system of Example 1, wherein both the anaerobic zone 1 and the anoxic zone 3 constitute an adjustment zone 4, and further includes the following steps:

[0072] S1. Obtain raw water quality and quantity data;

[0073] S2. Input the data obtained in S1 into the water quality model to predict the effluent water quality data, and compare it with the water quality target for operation control.

[0074] S3. When it is predicted that the system will meet the water quality control target without adding chemicals, no adjustment operation will be performed.

[0075] S4. When it is predicted that the ammonia nitrogen level will not meet the water quality control target without the addition of chemicals, adjust the regulation zone 4 of anaerobic zone 1 to an oxygenation environment in the model and make a new prediction.

[0076] S401, if the prediction meets the standard, the corresponding oxygenation device 5 will perform the oxygenation action;

[0077] S402. If the prediction fails to meet the standard, compare the predicted total nitrogen value to see if it is at a low level. If it is at a low level, adjust the regulation zone 4 of anoxic zone 3 to an oxygen-provided environment in the model. If it is at a high level, adjust the regulation zone 4 of anaerobic zone 1 to an oxygen-provided environment in the model.

[0078] S5. Repeat the prediction action of S4 and make judgments based on the steps of S401 and S402 until the ammonia nitrogen meets the water quality control target.

[0079] S6. When ammonia nitrogen meets the standard but total nitrogen does not, the system checks whether there is an adjustment zone 4 in the anaerobic zone 1 that can be adjusted to an oxygen-carrying environment. If so, the adjustment zone 4 is adjusted to an oxygen-carrying environment, and the adjustment zone 4 of the same volume of the anoxic zone 3 is restored to an anoxic environment until the total nitrogen meets the standard.

[0080] S7. When the total nitrogen in S6 fails to meet the standard, the anoxic volume of the anoxic zone 3 is maintained, while the regulation zone 4 in the anaerobic zone 1 is gradually adjusted to an oxygenated environment. If the oxygenated environment volume of the wastewater treatment is still insufficient, the regulation zone 4 in the anoxic zone 3 is gradually adjusted to an oxygenated environment to ensure that the ammonia nitrogen meets the standard.

[0081] S8. After the ammonia nitrogen in S7 meets the standard, add carbon source to the initial section of the anoxic zone 3, and gradually increase the amount added until the total nitrogen meets the standard.

[0082] In the AOA process treatment method disclosed herein, the wastewater to be treated can be predicted using a water quality model. Based on the prediction results, the volume selection of the three zones can be achieved without chemical dosing, and the dosage can be precisely controlled when adjusting the volume of the three zones alone cannot achieve the treatment target. In other words, the AOA process treatment method disclosed herein can achieve wastewater treatment without chemical dosing or with minimal chemical dosing by adjusting the volume of the three zones.

[0083] Specifically, the raw water quality and quantity data obtained in S1 may include indicators such as water temperature, water quantity, COD, ammonia nitrogen, total nitrogen, and total phosphorus; the water quality model in S2 may include ASM2D and ASM3P EAWAG models that are embedded in the control system using simulation software or developed and implemented in the control software.

[0084] The above description is merely a preferred embodiment of the present invention. It should be understood that the present invention is not limited to the forms disclosed herein and should not be construed as excluding other embodiments. It can be used in various other combinations, modifications, and environments, and can be altered within the scope of the concept described herein through the above teachings or related technologies or knowledge. Modifications and variations made by those skilled in the art that do not depart from the spirit and scope of the present invention should be within the protection scope of the appended claims.

Claims

1. A variable volume AOA process treatment system comprising an anaerobic zone (1), an aerobic zone (2) and an anoxic zone (3) connected in series, characterised in that: The anaerobic zone (1) and / or the anoxic zone (3) are at least partially constituted as a regulating zone (4), further comprising an oxygen supply device (5) for forming an oxygen supply environment in the regulating zone (4); The anaerobic zone (1), the aerobic zone (2) and the anoxic zone (3) are constituted in the same pool body (25), the oxygen supply device (5) comprises an aeration member arranged in the regulating zone (4) and the aerobic zone (2), and at least one movable partition plate (8) is movably arranged in the pool body (25); The oxygen supply device (5) comprises a disc-type aerator (10) embedded on the pool surface of the pool body (25), a connecting ring (11) is arranged on the top surface side of the disc-type aerator (10), an installation ring (12) is elastically arranged on the outer wall of the connecting ring (11), a plurality of blocking pieces (13) are arranged side by side in the moving direction of the movable partition plate (8) in the installation ring (12), and the blocking pieces (13) are adapted to elastically move between a first position and a second position; In the first position, the blocking pieces (13) open the installation ring (12), so that the airflow is communicated with the outside through the corresponding blocking pieces (13); In the second position, the blocking pieces (13) close the installation ring (12) to cut off the flow path between the corresponding blocking pieces (13) and the outside; A locking mechanism (14) is further arranged on the connecting ring (11), which can lock the blocking pieces (13) to keep the blocking pieces (13) in the second position; a guide slope (15) is arranged on the bottom side wall of the movable partition plate (8).

2. The variable volume AOA process system of claim 1, wherein: The locking mechanism (14) comprises a locking rod (16) penetrating through the connecting ring (11) and capable of elastic movement, the locking rod (16) comprises a locking end (17) extending into the connecting ring (11) and a driving end (18) opposite to the locking end (17), a first driving slope (19) is arranged on the bottom of the installation ring (12), a second driving slope (20) is correspondingly arranged on the driving end (18), when the installation ring (12) is pressed down, the first driving slope (19) pushes the second driving slope (20) to make the locking end (17) be pushed to a locking position, a locking part (21) is arranged on the blocking piece (13), when the blocking piece (13) enters the second position, the locking part (21) is mechanically locked with the locking end (17).

3. The variable volume AOA process system of claim 2, wherein: The locking part (21) and the locking end (17) are locked by a buckle structure.

4. The variable volume AOA process system of claim 2, wherein: The sealing sheet (13) comprises a first side (22) close to the aerobic zone (2) and a second side (23) opposite to the first side (22), and the second side (23) is provided with a tab (24) for driving the adjacent sealing sheet (13) to bounce downward, the sealing sheet (13) close to the aerobic zone (2) is a movable sealing sheet (26), and the opposite position of the movable sealing sheet (26) and the connecting ring (11) is not provided with the locking mechanism (14).

5. A process for the treatment of an AOA process comprising a variable volume AOA process treatment system according to any one of claims 1 to 4, and wherein the anaerobic zone (1) and the anoxic zone (3) are each provided with a regulating zone (4), characterised in that: Further comprising the following steps: S1, obtaining raw water quality and quantity data; S2, bringing the data obtained in S1 into a water quality model to predict effluent water quality data, and comparing with the running control water quality target; S3, when it is predicted that the system meets the control water quality target without adding chemicals, no adjustment operation is performed; S4, when it is predicted that the system does not meet the control water quality target of ammonia nitrogen without adding chemicals, the adjusting zone (4) of the anaerobic zone (1) is adjusted to an oxygenated environment in the model, and re-prediction is performed; S401, prediction of compliance, and the oxygenation device (5) corresponding to the oxygenation device (5) performs an oxygenation action; S402, prediction of non-compliance, and comparison of total nitrogen value to determine whether it is at a low level; if it is at a low level, the adjusting zone (4) of the anoxic zone (3) is adjusted to an oxygenated environment in the model; if it is at a high level, the adjusting zone (4) of the anaerobic zone (1) is adjusted to an oxygenated environment in the model; S5, the prediction action of S4 is repeated, and the steps of S401 and S402 are judged until the ammonia nitrogen meets the control water quality target; S6, when the ammonia nitrogen meets the target and the total nitrogen does not meet the target, the system detects whether the adjusting zone (4) in the anaerobic zone (1) can be adjusted to an oxygenated environment; if so, the adjusting zone (4) is adjusted to an oxygenated environment, and the adjusting zone (4) of the same volume in the anoxic zone (3) is restored to an anoxic environment, until the total nitrogen meets the target; S7, when the total nitrogen cannot meet the target in S6, the anoxic volume of the anoxic zone (3) is maintained, and the adjusting zone (4) in the anaerobic zone (1) is gradually adjusted to an oxygenated environment; at this time, if the oxygenated environment volume of the sewage treatment is still insufficient, the adjusting zone (4) in the anoxic zone (3) is gradually adjusted to an oxygenated environment, so as to ensure that the ammonia nitrogen meets the target; S8, after the ammonia nitrogen meets the target in S7, carbon source is added to the starting section of the anoxic zone (3), and the addition amount is gradually increased until the total nitrogen meets the target.

6. The AOA process treatment method of claim 5, wherein: The volume adjustment of the oxygenated environment of the adjusting zone (4) is linear.

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