Aeration tank for biological denitrification

Abstract

The utility model discloses an aeration tank for biological denitrification, which comprises an aeration tank and an air blower, a reaction bin is arranged in the aeration tank, a sixth aeration pipe is mounted on one side of the inner wall of the reaction bin, a fifth aeration pipe is mounted above the sixth aeration pipe, and nozzles facing the bottom of the other side of the reaction bin are arranged on the fifth aeration pipe and the sixth aeration pipe. An aeration column is further arranged in the reaction bin, a first aeration pipe and a second aeration pipe are arranged on the aeration column in an array and communicated mode, scattered spray heads are arranged on the first aeration pipe, spray heads which face the side away from the sixth aeration pipe and are arranged obliquely downwards are arranged on the second aeration pipe, the air blower is used for supplying air, and a blow-off pipe is arranged on the aeration tank. According to the utility model, air ejected by the fifth aeration pipe and the sixth aeration pipe blows sediments to the blow-off pipe, so that the sediments can move to the blow-off pipe, and air ejected by the second aeration pipe continuously blows the sediments sliding from the upper end of the bottom of the reaction bin downwards to slide, so that the sediments can be effectively accumulated.

Description

Technical Field

[0001] This utility model relates to the field of aeration tank technology, specifically to an aeration tank for biological denitrification. Background Technology

[0002] As a crucial treatment unit in wastewater treatment systems, the aeration tank plays a vital role in the entire wastewater treatment process. Essentially, it is a specialized structure that utilizes the activated sludge process to treat wastewater. Inside the aeration tank, air is forcibly introduced into the wastewater through specific aeration devices, allowing the wastewater and activated sludge to mix thoroughly and providing sufficient dissolved oxygen for aerobic microorganisms. These aerobic microorganisms feed on the organic matter in the wastewater, carrying out metabolic activities that decompose the organic matter into carbon dioxide and water, thereby achieving the removal of organic pollutants from the wastewater.

[0003] In the actual operation of aeration tanks for biological denitrification, the biological denitrification process involves complex microbial metabolic activities, among which nitrification and denitrification are the core links. In this process, microorganisms use nutrients such as carbon, nitrogen and phosphorus sources in wastewater for growth and reproduction. During metabolism, microorganisms secrete some viscous substances, which adsorb suspended particles and colloidal substances in wastewater to form larger flocs. Over time, these flocs will also settle down and form a thick sludge layer at the bottom of the aeration tank.

[0004] When using this type of aeration tank for a long time, a large amount of sediment and sludge will accumulate at the bottom of the aeration tank. After the sewage inside the aeration tank is discharged, the staff will use a cleaning shovel to pile up the sludge at the bottom of the aeration tank and then clean it. However, due to the large internal volume of the aeration tank, the staff need to spend a lot of time and energy to pile up the sludge, resulting in low efficiency in cleaning the inside of the aeration tank.

[0005] Therefore, there is an urgent need for an aeration tank for biological denitrification to solve the problem of low efficiency in handling the accumulation of sludge inside the aeration tank due to its large internal volume. Utility Model Content

[0006] This invention addresses the shortcomings of existing technologies by providing an aeration tank for biological denitrification, thereby solving the problem of low efficiency in handling the accumulation of sludge inside the aeration tank due to its large internal volume.

[0007] To achieve the above objectives, the present invention adopts the following technical solution:

[0008] An aeration tank for biological denitrification is characterized by comprising an aeration tank and a blower. The interior of the aeration tank is a reaction chamber. Several sixth aeration pipes are installed on one side of the inner wall of the reaction chamber, and several fifth aeration pipes are installed above the sixth aeration pipes. Both the fifth and sixth aeration pipes are equipped with nozzles facing the bottom of the other side of the reaction chamber. An aeration column is also provided inside the reaction chamber. Several first and second aeration pipes are arranged in an array and connected on the aeration column. The first aeration pipes are equipped with dispersed nozzles, and the second aeration pipes are equipped with nozzles facing the side away from the sixth aeration pipes and arranged obliquely downwards. The blower is used to connect the sixth aeration pipes, the fifth aeration pipes, and the aeration column to supply air. A sewage discharge pipe is provided on the aeration tank, which is connected to the bottom end of the reaction chamber on the side away from the sixth aeration pipes.

[0009] To optimize the above technical solution, the specific measures also include:

[0010] Furthermore, several first aeration pipes and second aeration pipes are arranged in a vertically spaced array on the aeration column, with the first aeration pipes arranged on the front and rear sides of the aeration column along the nozzle direction of the sixth aeration pipe, and the second aeration pipes arranged on the left and right sides of the aeration column respectively.

[0011] Furthermore, both the fifth and sixth aeration pipes are connected to fixed pipes and fixed to the inner wall of the reaction chamber through the fixed pipes. The side wall of the aeration tank is provided with a first ventilation groove, a second ventilation groove, and a third ventilation groove. The first ventilation groove is used to communicate with the fixed pipe, the second ventilation groove is used to communicate with the aeration column, and the third ventilation groove is used to communicate with the blower through the air inlet pipe, and to connect the blower with the first and second ventilation grooves.

[0012] Furthermore, a guide plate is provided on the side of the reaction chamber away from the sixth aeration pipe. The upper end of the guide plate has a "V"-shaped groove, and the lower tip of the "V"-shaped groove is connected to the sewage pipe.

[0013] Furthermore, the width of the guide plate narrows from both sides towards the middle.

[0014] Furthermore, the bottom surface of the reaction chamber is sloped downwards in the front-back direction from one side of the sixth aeration pipe to the other.

[0015] Furthermore, the bottom surface of the reaction chamber is inclined inward from the left and right sides towards the middle, and the drain pipe is located in the middle of the bottom of the reaction chamber.

[0016] Furthermore, the aeration tank is provided with a drain pipe that connects to the reaction chamber and is on the same side as the sixth aeration pipe. A filter cover is installed at one end of the drain pipe located inside the reaction chamber, and the outer wall of the filter cover is arc-shaped.

[0017] Furthermore, it also includes a third aeration pipe and a fourth aeration pipe, both of which are disposed on the aeration column and located below the first and second aeration pipes. The third aeration pipe is disposed on the front and rear sides of the aeration column, and the fourth aeration pipe is disposed on the left and right sides of the aeration column. Both the third and fourth aeration pipes are provided with nozzles facing the center of the reaction chamber and away from the sixth aeration pipe.

[0018] Furthermore, a one-way valve is installed inside the nozzle.

[0019] The beneficial effects of this utility model are:

[0020] This invention utilizes the coordinated arrangement of a fifth, sixth, and second aeration pipe. Air ejected from the fifth and sixth aeration pipes blows sediment from the bottom surface of the reaction chamber towards the drain pipe, allowing the sediment to move along the bottom surface to the vicinity of the drain pipe. Furthermore, air ejected from the second aeration pipe, which has a horizontal movement range, further blows sediment sliding down from the top of the reaction chamber, effectively accumulating it on one side of the bottom. This solves the problem of low efficiency in cleaning aeration tanks due to their large internal volume, reducing the workload of workers and improving the efficiency of cleaning the aeration tank.

[0021] This invention utilizes a downward-sloping nozzle on the outer wall of the fifth aeration pipe. This allows the gas emitted from the fifth aeration pipe to blow the sediment at the bottom of the second aeration pipe downwards, reducing the upward floating of the sediment. The nozzle of the first aeration pipe is set vertically upwards, enabling rapid contact between oxygen and the wastewater at the top of the aeration tank. The vertical upward spray of gas from the first aeration pipe also helps increase the oxygen content of the wastewater at the top of the aeration tank. The guide plate facilitates the flow of sediment towards the outlet pipe, making it easier for personnel to remove the sediment from the aeration tank.

[0022] This invention, through the setting of the filter cover, can filter dirt when sewage is discharged from the drain pipe, and the gas sprayed from the sixth aeration pipe forms a water flow on the surface of the filter cover. The water flow washes the surface of the filter cover, so that dirt will not be blocked on the surface of the filter cover. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the overall structure of an aeration tank for biological denitrification proposed in this utility model;

[0024] Figure 2 This is a partial cross-sectional view of an aeration tank for biological denitrification proposed in this utility model;

[0025] Figure 3 This is a schematic diagram showing the connection of the blower in an aeration tank for biological denitrification proposed in this utility model;

[0026] Figure 4 This is a side sectional view of an aeration tank for biological denitrification proposed in this utility model.

[0027] Figure 5 This is a schematic diagram of the bottom structure of the reaction chamber of an aeration tank for biological denitrification proposed in this utility model;

[0028] Figure 6 This is a schematic diagram of the third and fourth aeration pipes of an aeration tank for biological denitrification proposed in this utility model.

[0029] Reference numerals in the attached drawings: 1. Aeration tank; 101. Reaction chamber; 102. Sewage pipe; 103. Drainage pipe; 2. Aeration column; 201. First aeration pipe; 202. Second aeration pipe; 203. Third aeration pipe; 204. Fourth aeration pipe; 3. Fifth aeration pipe; 4. Sixth aeration pipe; 5. Fixed pipe; 501. First ventilation trough; 502. Second ventilation trough; 503. Third ventilation trough; 6. Blower; 601. Air inlet pipe; 7. Circular groove; 8. Filter cover; 9. Guide plate. Detailed Implementation

[0030] The present invention will now be described in detail with reference to the accompanying drawings.

[0031] As attached Figure 1 As shown in the figure, an aeration tank for biological denitrification according to an embodiment of the present invention includes an aeration tank 1 and a blower 6. The interior of the aeration tank 1 is a reaction chamber 101. Several sixth aeration pipes 4 are horizontally installed on one side of the inner wall of the reaction chamber 101. Several fifth aeration pipes 3 are horizontally installed above the sixth aeration pipes 4. Both the fifth aeration pipes 3 and the sixth aeration pipes 4 are provided with nozzles facing the bottom of the other side of the reaction chamber 101. An aeration column 2 is also provided inside the reaction chamber 101 through an annular groove 7. Several first aeration pipes 201 and second aeration pipes 202 are arrayed and connected on the aeration column 2. The first aeration pipes 201 are provided with dispersed nozzles. The second aeration pipes 202 are provided with nozzles facing the side away from the sixth aeration pipes 4 and obliquely downward. The blower 6 is used to connect the sixth aeration pipes 4, the fifth aeration pipes 3 and the aeration column 2 for supplying air. The aeration tank 1 is provided with a sewage pipe 102 connected to the bottom end of the side of the reaction chamber 101 away from the sixth aeration pipes 4.

[0032] This invention, through the coordinated arrangement of the fifth aeration pipe 3, the sixth aeration pipe 4, and the second aeration pipe 202, allows the air ejected from the fifth aeration pipe 3 and the sixth aeration pipe 4 to blow the sediment on the bottom surface of the reaction chamber 101 toward the drain pipe 102. This allows the sediment to move along the bottom surface of the reaction chamber 101 to the vicinity of the drain pipe 102. Furthermore, the air ejected from the second aeration pipe 202, which has a movable horizontal height, can continue to blow the sediment that has slid down from the upper bottom of the reaction chamber 101 downwards, allowing the sediment to effectively accumulate on one side of the bottom of the reaction chamber 101. This solves the problem of low efficiency in cleaning the aeration tank due to its large internal volume, reducing the workload of workers in accumulating sediment inside the aeration tank 1 and improving the efficiency of cleaning the aeration tank 1.

[0033] In the above scheme, the outer wall of the sixth aeration pipe 4 is in contact with the bottom surface of the reaction chamber 101, and the spray direction of the nozzle on the outer wall of the sixth aeration pipe 4 is at the same horizontal plane as the bottom surface of the reaction chamber 101, so that the air sprayed from the sixth aeration pipe 4 can blow the sediment on the bottom surface of the reaction chamber 101 toward the drain pipe 102, thereby allowing the sediment to slide down along the bottom surface of the reaction chamber 101 to the vicinity of the drain pipe 102.

[0034] In the above scheme, the fifth aeration pipe 3 is located above the sixth aeration pipe 4, and the nozzle on the outer wall of the fifth aeration pipe 3 is set at an angle downward. The gas sprayed from the fifth aeration pipe 3 can blow the sediment at the bottom of the second aeration pipe 2 downward, reducing the sediment from floating upward.

[0035] In the above scheme, the nozzle of the first aeration pipe 201 is set to be vertically upward, so that oxygen can quickly come into contact with the sewage at the top of the aeration tank 1. The first aeration pipe 201 sprays gas vertically upward, which can easily increase the oxygen content of the sewage at the top of the aeration tank 1.

[0036] In the above scheme, the cavity inside the aeration column 2 is larger than the cavity inside the first aeration pipe 201 and the second aeration pipe 202, and the aeration column 2 can supply air to several first aeration pipes 201 and second aeration pipes 202.

[0037] As attached Figure 2 As shown, in a specific embodiment based on the above, several first aeration pipes 201 and second aeration pipes 202 are arranged in a vertically spaced array on the aeration column 2. The first aeration pipes 201 are arranged on the front and rear sides of the aeration column 2 along the nozzle direction of the sixth aeration pipe 4, and the second aeration pipes 202 are correspondingly arranged on the left and right sides of the aeration column 2. In this way, the second aeration pipes 202 distributed on the left and right sides can ensure that the sediment on both sides is effectively accumulated. In this scheme, the fifth aeration pipe 3 and the sixth aeration pipe 4 can also be arranged synchronously on the left and right sides as needed.

[0038] As attached Figure 3 As shown, in another specific embodiment based on the above, a fixed pipe 5 is connected to both the fifth aeration pipe 3 and the sixth aeration pipe 4, and is fixed to the inner wall of the reaction chamber 101 by the fixed pipe 5. A first ventilation groove 501, a second ventilation groove 502 and a third ventilation groove 503 are opened in the side wall of the aeration tank 1. The first ventilation groove 501 is used to communicate with the fixed pipe 5, the second ventilation groove 502 is used to communicate with the aeration column 2, and the third ventilation groove 503 is used to communicate with the blower 6 through the air inlet pipe 601, and to connect the blower 6 with the first ventilation groove 501 and the second ventilation groove 502. During use, the blower 6 absorbs a large amount of air and delivers it to the third ventilation slot 503 through the air inlet pipe 601. The air inside the third ventilation slot 503 is delivered to the aeration column 2, the fifth aeration pipe 3, and the sixth aeration pipe 4 through the second ventilation slot 502 and the first ventilation slot 501, respectively, thereby providing sufficient oxygen for the aeration column 2, the fifth aeration pipe 3, and the sixth aeration pipe 4.

[0039] In another specific embodiment based on the above, a guide plate 9 is provided on the side of the reaction chamber 101 away from the sixth aeration pipe 4. The upper end of the guide plate 9 has a "V"-shaped groove, and the lower tip of the "V"-shaped groove is connected to the drain pipe 102. In use, when the sediment slides to the bottom surface of the reaction chamber 101, the guide plate 9 helps to guide the sediment to the port of the drain pipe 102, making it convenient for personnel to clean the sediment out of the aeration tank 1 from the drain pipe 102.

[0040] In a further embodiment based on the above, the width of the guide plate 9 narrows from both sides towards the middle. This facilitates the collection of sediment from both sides towards the middle.

[0041] As attached Figure 4 As shown, in another specific embodiment based on the above, the bottom surface of the reaction chamber 101 is sloped downwards in the front-back direction from one side of the sixth aeration pipe 4 to the other. This, combined with the drain pipe 102 located on the bottom surface of the reaction chamber 101, allows sediment inside the aeration tank 1 to slide down the bottom surface of the reaction chamber 101 and collect at the port of the drain pipe 102, thus facilitating the discharge of sediment from the drain pipe 102. Simultaneously, in this design, the orientation of the nozzles can be adjusted to facilitate sediment accumulation on one side, and the guide plate 9 and drain pipe 102 further facilitate sediment discharge.

[0042] As attached Figure 5 As shown, in a further embodiment based on the above, the bottom surface of the reaction chamber 101 is inclined inward from the left and right sides towards the middle, and the drain pipe 102 is located in the middle of the bottom of the reaction chamber 101. This allows the sediment from both sides to collect in the middle and slide towards the drain pipe 102.

[0043] In another specific embodiment based on the above, the aeration tank 1 is provided with a drain pipe 103 connected to the reaction chamber 101 and on the same side as the sixth aeration pipe 4. A filter cover 8 is installed at one end of the drain pipe 103 located inside the reaction chamber 101, and the outer wall of the filter cover 8 is arc-shaped. In this solution, the drain pipe 103 and the filter cover 8 can be set in the middle of the sixth aeration pipes 4 on both sides. During use, when sewage is discharged from the drain pipe 103, the filter cover 8 can filter the dirt, and the gas sprayed from the sixth aeration pipe 4 forms a water flow on the surface of the filter cover 8. The water flow washes the surface of the filter cover 8, so that dirt will not be blocked on the surface of the filter cover 8. In this solution, the drain pipe 103 can be set in conjunction with the slope of the bottom surface of the reaction chamber 101, so as to avoid the discharge of sediment during drainage.

[0044] As attached Figure 6 As shown, in another specific embodiment based on the above, a third aeration pipe 203 and a fourth aeration pipe 204 are also included. The third aeration pipe 203 and the fourth aeration pipe 204 are both arranged on the aeration column 2 and located below the first aeration pipe 201 and the second aeration pipe 202. The third aeration pipe 203 is arranged on the front and rear sides of the aeration column 2, and the fourth aeration pipe 204 is arranged on the left and right sides of the aeration column 2. Both the third aeration pipe 203 and the fourth aeration pipe 204 are provided with nozzles facing the center of the reaction chamber 101 and away from the sixth aeration pipe 4.

[0045] In this scheme, a third aeration pipe 203 is installed at the bottom of the first aeration pipe 201, and the nozzle installed on the outer wall of the third aeration pipe 203 is set to tilt downward, and the nozzle spray direction is along the bottom slope of the reaction chamber 101 towards the lower side, so that the air sprayed from the third aeration pipe 203 can slide the sediment that gathers in the center of the V-shaped bottom of the reaction chamber 101 to the outlet of the sewage pipe 102.

[0046] A fourth aeration pipe 204 is installed on both sides of the third aeration pipe 203. The nozzles installed on the outer wall of the fourth aeration pipe 204 are oriented so that the nozzles face the bottom of the aeration column 2. The nozzles are rotated 20 degrees counterclockwise around the fourth aeration pipe 204, so that the air sprayed from the fourth aeration pipe 204 can blow the sediment on the bottom surface of the reaction chamber 101 toward the center of the bottom surface of the reaction chamber 101. The air sprayed from the fourth aeration pipe 204 can also make the sediment on the bottom surface of the reaction chamber 101 slide down to the bottom of the reaction chamber 101, thereby reducing the amount of work required for personnel to collect and accumulate sediment inside the aeration tank 1.

[0047] In another specific embodiment based on the above, a one-way valve is provided inside the nozzle. When the blower 6 does not supply air to the aeration column 2, the sewage inside the reaction chamber 101 will not flow into the aeration column 2 through the nozzle.

[0048] One specific embodiment of the device of this utility model is as follows:

[0049] First, a sufficient number of bacteria are cultivated inside the aeration tank 1. Then, wastewater is poured into the reaction chamber 101 through the open top until it overflows the top of the aeration column 2. The blower 6 is then turned on, drawing in a large amount of air and supplying it through the air inlet pipe 601 to the third ventilation channel 503. The air inside the third ventilation channel 503 is then supplied to the aeration column 2, the fifth aeration pipe 3, and the sixth aeration pipe 4 through the second ventilation channel 502 and the first ventilation channel 501. The air inside the aeration column 2 is then sprayed into the reaction chamber 101 through the first and second aeration pipes 201 and 202. Simultaneously, the first, second, and fifth aeration pipes 201, 202, 3, and 4 spray a large amount of air into the reaction chamber 101, providing sufficient oxygen for the bacteria inside the aeration tank 1. To increase the denitrification efficiency of the microbial community, the bottom of the reaction chamber 101 is inclined, and the spray direction of the nozzle on the outer wall of the sixth aeration pipe 4 is at the same level as the bottom surface of the reaction chamber 101. The air sprayed from the fifth aeration pipe 3 and the sixth aeration pipe 4 can blow the sediment on the bottom surface of the reaction chamber 101 toward the direction of the sewage pipe 102, so that the sediment can slide down along the bottom surface of the reaction chamber 101 to the vicinity of the sewage pipe 102. The air sprayed from the second aeration pipe 202 on both sides of the outer wall of the aeration column 2 will continue to blow the sediment that has slid down from the top bottom of the reaction chamber 101 downwards, so that the sediment at the bottom of the reaction chamber 101 can accumulate at the bottom of the reaction chamber 101, making it easier for the sediment accumulated at the bottom of the reaction chamber 101 to be discharged from the aeration tank 1 through the sewage pipe 102.

[0050] It should be noted that the terms such as "upper", "lower", "left", "right", "front", and "back" used in this utility model are only for clarity of description and are not intended to limit the scope of implementation of this utility model. Changes or adjustments to their relative relationships, without substantially altering the technical content, should also be considered as within the scope of implementation of this utility model.

[0051] The above are merely preferred embodiments of this utility model. The protection scope of this utility model is not limited to the above embodiments. All technical solutions falling within the scope of this utility model's concept are within its protection scope. It should be noted that for those skilled in the art, any improvements and modifications made without departing from the principle of this utility model should be considered within its protection scope.

Claims

1. A biological denitrification aeration tank characterized by comprising: The system includes an aeration tank (1) and a blower (6). The interior of the aeration tank (1) is a reaction chamber (101). Several sixth aeration pipes (4) are installed on one side of the inner wall of the reaction chamber (101). Several fifth aeration pipes (3) are installed above the sixth aeration pipes (4). Both the fifth aeration pipes (3) and the sixth aeration pipes (4) are equipped with nozzles facing the bottom of the other side of the reaction chamber (101). The interior of the reaction chamber (101) is also equipped with aeration columns (2). The aeration columns (2) are arrayed and connected to the ground. The system is provided with several first aeration pipes (201) and second aeration pipes (202). The first aeration pipes (201) are provided with dispersed nozzles, and the second aeration pipes (202) are provided with nozzles facing away from the sixth aeration pipe (4) and arranged obliquely downwards. The blower (6) is used to connect the sixth aeration pipe (4), the fifth aeration pipe (3) and the aeration column (2) for supplying air. The aeration tank (1) is provided with a sewage pipe (102) connected to the bottom end of the reaction chamber (101) away from the sixth aeration pipe (4).

2. The aeration tank for biological denitrification according to claim 1, characterized by: Several first aeration pipes (201) and second aeration pipes (202) are arranged vertically at intervals on the aeration column (2), and the first aeration pipes (201) are arranged on the front and rear sides of the aeration column (2) along the nozzle direction of the sixth aeration pipe (4), and the second aeration pipes (202) are arranged on the left and right sides of the aeration column (2).

3. The aeration tank for biological denitrification according to claim 1, characterized by: The fifth aeration pipe (3) and the sixth aeration pipe (4) are both connected to a fixed pipe (5), which is fixed to the inner wall of the reaction chamber (101) through the fixed pipe (5). The side wall of the aeration tank (1) is provided with a first ventilation groove (501), a second ventilation groove (502) and a third ventilation groove (503). The first ventilation groove (501) is used to communicate with the fixed pipe (5), the second ventilation groove (502) is used to communicate with the aeration column (2), and the third ventilation groove (503) is used to communicate with the blower (6) through the air inlet pipe (601), and to connect the blower (6) with the first ventilation groove (501) and the second ventilation groove (502).

4. The biological denitrification aeration tank according to claim 1, characterized in that: Inside the reaction chamber (101), a guide plate (9) is provided on the side away from the sixth aeration pipe (4). The upper end of the guide plate (9) is provided with a "V" shaped groove, and the lower tip of the "V" shaped groove is connected to the sewage pipe (102).

5. The biological denitrification aeration tank according to claim 4, characterized in that: The width of the guide plate (9) narrows from both sides toward the middle.

6. The biological denitrification aeration tank according to claim 1, characterized in that: The bottom surface of the reaction chamber (101) is arranged in a downward slope in the front-back direction from one side to the other side of the sixth aeration pipe (4).

7. The biological denitrification aeration tank according to claim 6, characterized in that: The bottom surface of the reaction chamber (101) is inclined inward from the left and right sides toward the middle, and the drain pipe (102) is located in the middle of the bottom of the reaction chamber (101).

8. The biological denitrification aeration tank according to claim 1, characterized in that: The aeration tank (1) is provided with a drain pipe (103) that connects to the reaction chamber (101) and is on the same side as the sixth aeration pipe (4). A filter cover (8) is installed at one end of the drain pipe (103) located inside the reaction chamber (101). The outer wall of the filter cover (8) is set to be arc-shaped.

9. The biological denitrification aeration tank according to claim 1, characterized in that: It also includes a third aeration pipe (203) and a fourth aeration pipe (204), both of which are located on the aeration column (2) and below the first aeration pipe (201) and the second aeration pipe (202). The third aeration pipe (203) is located on the front and rear sides of the aeration column (2), and the fourth aeration pipe (204) is located on the left and right sides of the aeration column (2). Both the third aeration pipe (203) and the fourth aeration pipe (204) are provided with nozzles facing the center of the reaction chamber (101) and away from the sixth aeration pipe (4).

10. The biological denitrification aeration tank according to claim 1, characterized in that: The nozzle is equipped with a one-way valve.

Images