A high-efficiency denitrification device with stable water inlet energy-saving automatic operation

Abstract

This invention discloses a high-efficiency denitrification device with stable influent, energy-saving, and automatic operation, comprising: an influent preconditioning tank, an anaerobic ammonia oxidation reaction tank, a sedimentation tank, and a product water tank arranged sequentially along the high ammonia nitrogen wastewater treatment direction; a portion of the effluent from the product water tank is returned to the influent preconditioning tank via a product water return pump; the first online ammonia nitrogen meter in the influent preconditioning tank is interlocked with the product water return pump, and the online pH meter in the influent preconditioning tank is interlocked with the alkali dosing system and the acid dosing system; the top of the anaerobic ammonia oxidation reaction tank has a closed gas collection chamber formed by a gas collection hood, and the bottom of the anaerobic ammonia oxidation reaction tank is provided with an aeration pipeline; the top outlet of the gas collection hood is connected to the aeration pipeline via a nitrogen circulation pipeline, and the aeration pipeline is also connected to the air intake system; the anaerobic ammonia oxidation reaction tank is connected to online dissolved oxygen meters, online nitrite nitrogen meters, and online nitrate nitrogen meters, and the air intake system is interlocked with the online dissolved oxygen meters, online nitrite nitrogen meters, and online nitrate nitrogen meters.

Description

Technical Field

[0001] This invention relates to the field of high ammonia nitrogen wastewater treatment technology, specifically to a high-efficiency denitrification device with stable influent, energy-saving, and automatic operation. Background Technology

[0002] Anaerobic ammonia oxidation (AAO) refers to a reaction under anaerobic conditions in which anaerobic ammonia-oxidizing bacteria use ammonia nitrogen as an electron donor and nitrite nitrogen as an electron acceptor, utilizing inorganic carbon sources to directly convert ammonia nitrogen and nitrite nitrogen into nitrogen gas, producing a small amount of nitrate nitrogen. The advantages of this technology include low energy consumption, low carbon source input, low sludge production, high denitrification load, and small footprint, thus attracting increasing attention from enterprises and researchers. However, in practical applications, it has been found that the complex composition and variable concentration of the influent make it difficult to adjust the reaction conditions within the anaerobic ammonia oxidation reactor in real time to adapt to fluctuations in influent water quality. This leads to unstable reactor operation, long recovery periods, and ultimately, significantly hinders the widespread adoption of this process.

[0003] Several methods have been disclosed to ensure the stable operation of anaerobic ammonia oxidation systems.

[0004] For example, in Zhang Shujun's paper "An Integrated Anaerobic Ammonia Oxidation Device for Treating Urban Sewage and Its Operation Method" (CN201710784514.4), the invention only describes the connection method of each hardware component and the rough control method, without performing precise calculations and control of the control method.

[0005] For example, the automatic control module and method for anaerobic ammonia oxidation process published by Jin Rencun (application number: CN201310224433.0) can achieve automatic control, but it can only detect the conductivity of influent and effluent water to avoid high-load operation, and cannot solve the problem of substrate self-inhibition caused by changes in substrate.

[0006] For example, in Liu Jianyong's "A Method for Achieving Stable Operation of a Continuous Flow Anaerobic Ammonia Oxidation Reactor" (application number: 202111245433.X), the invention achieves stable operation of anaerobic ammonia oxidation by controlling whether the concentration of ammonia nitrogen in the effluent exceeds a threshold. However, the detection of the concentration of ammonia nitrogen in the effluent has a lag effect. When there is a change in the ammonia nitrogen concentration in the effluent, a batch of water with significant changes in water quality has already entered the reaction tank. Since the influent water quality is not controlled in real time from the source, it is still difficult to ensure the stable operation of the anaerobic ammonia oxidation reaction tank. Summary of the Invention

[0007] To address the shortcomings of existing technologies, this invention provides a high-efficiency denitrification device with stable influent, energy-saving, and automatic operation. Firstly, it interlocks the online instruments in the influent pre-conditioning tank with the permeate return pump and acid / alkali dosing device to stabilize the influent water quality within a certain range, reducing the impact of influent water quality changes on the anaerobic ammonia oxidation reaction system. Secondly, it interlocks the aeration blower with online instruments for nitrate nitrogen, nitrite nitrogen, and dissolved oxygen to control the anaerobic ammonia oxidation reaction state, and uses a second online ammonia nitrogen instrument to evaluate the anaerobic ammonia oxidation removal effect. Thirdly, it collects nitrogen from the anaerobic ammonia oxidation reaction tank through a gas collection chamber for recycling and mixing in the anaerobic ammonia oxidation reactor, reducing the air supply to the aeration blower and thus lowering blower energy consumption. Furthermore, the upward flow velocity of the anaerobic ammonia oxidation sludge can be controlled by adjusting the circulating air volume, thereby creating conditions for the cultivation of anaerobic ammonia oxidation granular sludge.

[0008] This invention discloses a high-efficiency denitrification device with stable influent, energy saving and automatic operation, comprising: an influent pre-conditioning tank, an anaerobic ammonia oxidation reaction tank, a sedimentation tank and a product water tank arranged sequentially along the high ammonia nitrogen wastewater treatment direction, wherein part of the effluent from the product water tank is returned to the influent pre-conditioning tank through a product water return pump;

[0009] The influent preconditioning tank is connected to an alkali dosing system, an acid dosing system, an online pH meter, and a first online ammonia nitrogen meter. A mixer is installed inside the influent preconditioning tank. The first online ammonia nitrogen meter is interlocked with the permeate return pump, and the online pH meter is interlocked with the alkali dosing system and the acid dosing system. By setting the ranges for ammonia nitrogen and pH values, the permeate return flow rate and the dosage of acid and alkali are adjusted. The mixer ensures uniform mixing of the water in the influent preconditioning tank, achieving a stable influent flow to the anaerobic ammonia oxidation reaction unit.

[0010] The top of the anaerobic ammonia oxidation reactor is formed by a gas collection hood, creating a closed gas collection chamber. The bottom of the reactor is equipped with an aeration pipeline. The top outlet of the gas collection hood is connected to a nitrogen exhaust pipeline and a nitrogen circulation pipeline, respectively. The inlet of the aeration pipeline is connected to the nitrogen circulation pipeline and the air intake system. The anaerobic ammonia oxidation reactor is equipped with online dissolved oxygen, nitrite, nitrate, and a second ammonia nitrogen meter. The air intake system is interlocked with these online meters. The system operates when the dissolved oxygen concentration is greater than or equal to a first threshold, and the nitrate nitrogen concentration shows a positive increasing trend with the highest concentration c. 硝态氮 The concentrations of ≥2000 nitrate nitrogen and nitrite nitrogen show an inverse increasing trend, with the minimum concentration c being the lowest. 亚硝态氮 If any one of the three conditions ≤ the third threshold is met, the aeration volume of the air intake system is reduced until the air intake system is shut down; otherwise, the aeration volume of the aeration fan is increased. Through the above interlock control, the anaerobic ammonia oxidation is kept in a stable operating state, and the removal effect of anaerobic ammonia oxidation is judged by the second online ammonia nitrogen meter.

[0011] The sludge outlet of the sedimentation tank is connected to a sludge return pipeline and a sludge discharge pipeline, respectively. The other end of the sludge return pipeline is connected to the sludge inlet of the anaerobic ammonia oxidation reactor. A sludge return pump is installed on the sludge return pipeline, and a sludge discharge pump is installed on the sludge discharge pipeline.

[0012] As a further improvement of the present invention, the influent preconditioning tank is provided with a sewage influent pipeline, the outlet of the influent preconditioning tank is connected to the influent of the anaerobic ammonia oxidation reaction tank through a first influent pump, the return port of the product water tank is connected to the return port of the influent preconditioning tank through a product water return pipeline, and a product water return pump is provided on the product water return pipeline.

[0013] As a further improvement of the present invention, a first gas flow meter and a first automatic regulating valve are provided on the nitrogen exhaust pipe, a second gas flow meter and a second automatic regulating valve are provided on the nitrogen circulation pipe, and a pressure sensor is provided on the gas collection hood; the pressure sensor is interlocked with the first automatic regulating valve, and the opening pressure of the first automatic regulating valve is greater than the opening pressure of the second automatic regulating valve; in use, a large amount of nitrogen gas is generated during the anaerobic ammonia oxidation reaction in the wastewater in the anaerobic ammonia oxidation reactor. The nitrogen gas is collected using the gas collection chamber. After the gas volume reaches the set value, it flows into the air inlet of the aeration pipe through the second automatic regulating valve and the nitrogen circulation pipe, and the sludge in the reactor is mixed and stirred through the aeration pipe; as the anaerobic ammonia oxidation reaction continues, the gas volume in the gas collection chamber will gradually accumulate. When the pressure sensor detects that the pressure in the gas collection chamber reaches the release threshold, the first automatic regulating valve automatically opens to release nitrogen gas; when the pressure sensor detects that the pressure in the gas collection chamber drops to the stop release threshold, the first automatic regulating valve automatically closes to maintain a certain aeration gas volume in the reactor.

[0014] As a further improvement of the present invention, the air intake system includes an aeration blower, the air outlet of the aeration blower is connected to the air inlet of the aeration pipeline through an air intake pipeline, and the air intake pipeline is provided with a third gas flow meter and a third automatic regulating valve.

[0015] As a further improvement of the present invention, the outlet of the anaerobic ammonia oxidation reactor is connected to the inlet of the sedimentation tank through a reactor outlet pipeline, and the outlet of the sedimentation tank is connected to the inlet of the product water tank through a sedimentation tank outlet pipeline.

[0016] As a further improvement of the present invention, the first threshold is dissolved oxygen concentration = 0.5 mg / L, and the second threshold is the highest positive growth concentration of nitrate nitrogen c. 硝态氮 =20 mg / L, the third threshold is the minimum concentration of nitrite nitrogen in reverse growth c 亚硝态氮 =5mg / L. The design of the first, second and third thresholds mentioned above can be reasonably adjusted within a certain range according to actual needs.

[0017] As a further improvement of the present invention, interlocking control is achieved through an automatic control module on the self-control cabinet. The automatic control module includes an influent pre-conditioning control module, a nitrogen recycling control module, and an anaerobic ammonia oxidation stable operation control module. Firstly, by using online instruments and setting parameters to interlock and control acid and alkali dosing and permeate return flow, the influent ammonia nitrogen concentration is maintained within a certain range. Secondly, by using a gas collection chamber and automatic valves to achieve mixing and stirring of the reaction unit, and by controlling the circulating gas volume to adjust the sludge rising velocity, granular sludge cultivation is achieved. Thirdly, by interlocking online instruments with the aeration system, the reaction unit achieves automatic and stable operation.

[0018] The inlet water pre-conditioning control module is equipped with an online instrument ammonia nitrogen and pH value display program, a pH value upper and lower limit setting program, an interlocking control program between the pH online instrument and the alkali dosing system and the acid dosing system, and an interlocking control program between the first ammonia nitrogen online instrument and the product water return pump.

[0019] The nitrogen recycling control module is equipped with a pressure sensor value display program, a first gas flow meter display program, a second gas flow meter display program, and a pressure sensor and first automatic regulating valve interlock control program.

[0020] The anaerobic ammonia oxidation stable operation control module is equipped with a program for displaying the values ​​of dissolved oxygen, ammonia nitrogen, nitrate nitrogen, and nitrite nitrogen, a program for displaying the third gas flow meter, a program for inputting and setting the value of nitrate nitrogen and nitrite nitrogen change amplitude, and a program for interlocking control between the aeration blower and the online dissolved oxygen, nitrite nitrogen, and nitrate nitrogen instruments.

[0021] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0022] 1. By interlocking the permeate recirculation with the online ammonia nitrogen meter, the concentration of ammonia nitrogen in the influent is stabilized, effectively ensuring the stable operation of the subsequent anaerobic ammonia oxidation reaction unit;

[0023] 2. By recirculating the permeate, the amount of chemicals required for acid and alkali dosing systems can be effectively reduced;

[0024] 3. By recirculating the permeate, the heating load in the influent preconditioning tank can be effectively reduced;

[0025] 4. By interlocking the aeration blower with dissolved oxygen, nitrate nitrogen, and nitrite nitrogen, and displaying ammonia nitrogen online, the accumulation of free ammonia and nitrite substrates can be effectively avoided, thus preventing the normal operation of the anaerobic ammonia oxidation reaction unit;

[0026] 5. By recycling nitrogen gas for mixing and stirring in the anaerobic ammonia oxidation reaction unit, uniform stirring can be achieved, the power consumption of the blower can be reduced, and the uneven mixing in the anaerobic ammonia oxidation reaction unit caused by insufficient aeration air volume of the aeration blower can be avoided.

[0027] 6. The device has a high degree of automation, which can reduce the frequency of abnormal operation of anaerobic ammonia oxidation due to insufficient operator skill. Attached Figure Description

[0028] Figure 1 This is a schematic diagram of the structure of the high-efficiency denitrification device with stable water intake, energy saving, and automatic operation disclosed in this invention.

[0029] In the picture:

[0030] 1. Influent Preconditioning Tank; 1.1 Wastewater Influent Pipeline; 1.2 Alkali Dosing System; 1.3 Acid Dosing System; 1.4 Online pH Instrument; 1.5 First Online Ammonia Nitrogen Instrument; 1.6 Agitator; 2. Anaerobic Ammonia Oxidation Reactor; 2.1 First Influent Pump; 2.2 Dissolved Oxygen Online Instrument; 2.3 Nitrite Nitrogen Online Instrument; 2.4 First Gas Flow Meter; 2.5 First Automatic Control Valve; 2.6 Second Automatic Control Valve; 2.7 Second Gas Flow Meter; 2.8 Pressure Sensor; 2.9 Nitrogen Circulation Pipeline; 2.10 Gas Collection Chamber 2.11. Nitrate nitrogen online instrument; 2.12. Second ammonia nitrogen online instrument; 2.13. Reaction tank effluent pipeline; 2.14. Aeration pipeline; 2.15. Third gas flow meter; 2.16. Air inlet pipeline; 2.17. Aeration blower; 2.18. Third automatic regulating valve; 2.19. Sludge return pipeline; 2.20. Sludge return pump; 2.21. Sludge discharge pump; 2.22. Sludge discharge pipeline; 2.23. Sedimentation tank; 2.24. Sedimentation tank effluent pipeline; 3. Product water tank; 3.1. Product water return pump; 3.2. Product water return pipeline; 4. Automatic control cabinet. Detailed Implementation

[0031] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0032] The present invention will now be described in further detail with reference to the accompanying drawings:

[0033] like Figure 1 As shown, the present invention provides a high-efficiency denitrification device with stable influent, energy saving and automatic operation, comprising: an influent pre-conditioning tank 1, an anaerobic ammonia oxidation reaction tank 2, a sedimentation tank 2.23, a product water tank 3 and an automatic control cabinet 4 arranged sequentially along the high ammonia nitrogen wastewater treatment direction;

[0034] The influent preconditioning tank 1 is equipped with a sewage inlet pipeline 1.1, which receives high-ammonia nitrogen sewage from the previous process. The influent preconditioning tank 1 is connected to an alkali dosing system 1.2, an acid dosing system 1.3, an online pH meter 1.4, and a first online ammonia nitrogen meter 1.5. A mixer 1.6 is installed inside the influent preconditioning tank 1. The outlet of the influent preconditioning tank 1 is connected to the inlet of the anaerobic ammonia oxidation reactor 2 via a first influent pump 2.1. The return outlet of the permeate tank 3 is connected to the return outlet of the influent preconditioning tank 1 via a permeate return pipeline 3.2. A permeate return pump 3.1 is installed on the permeate return pipeline 3.2 to return water from the permeate tank 3 to the influent preconditioning tank 1, achieving a stable influent flow. The first online ammonia nitrogen meter 1.5 is interlocked with the permeate return pump 3.1, and the online pH meter 1.4 is interlocked with the alkali dosing system 1.2 and the acid dosing system 1.3. By setting the range of ammonia nitrogen (the ammonia nitrogen concentration is adjusted according to the actual treatment load) and pH value (pH=7~8), the permeate return flow rate of the permeate tank 3 and the acid and alkali dosing amounts of the alkali dosing system 1.2 and the acid dosing system 1.3 are adjusted. The agitator 1.6 is used to make the water quality of the influent pre-conditioning tank 1 uniformly mixed, so as to achieve the effect of stable influent of the anaerobic ammonia oxidation reaction unit.

[0035] The anaerobic ammonia oxidation reactor 2 of the present invention has a closed gas collection chamber 2.10 formed at the top by a gas collection hood, and an aeration pipeline 2.14 is provided at the bottom of the anaerobic ammonia oxidation reactor 1. The gas outlet at the top of the gas collection hood is connected to a nitrogen exhaust pipeline and a nitrogen circulation pipeline 2.9, respectively. A first gas flow meter 2.4 and a first automatic regulating valve 2.5 are provided on the nitrogen exhaust pipeline, and a second gas flow meter 2.7 and a second automatic regulating valve 2.6 are provided on the nitrogen circulation pipeline 2.9. A pressure sensor 2.8 is provided on the gas collection hood. The air inlet of the aeration pipeline 2.14 is connected to the nitrogen circulation pipeline 2.9 and the air intake system, respectively. The air intake system includes an aeration fan 2.17, and the air outlet of the aeration fan 2.17 is connected to the air inlet of the aeration pipeline 2.14 through an air intake pipeline 2.16. A third gas flow meter 2.15 and a third automatic regulating valve 2.18 are provided on the air intake pipeline. The pressure sensor 2.8 is interlocked with the first automatic regulating valve 2.5, and the opening pressure of the first automatic regulating valve 2.5 is greater than the opening pressure of the second automatic regulating valve 2.6. During operation, a large amount of nitrogen gas is generated during the anaerobic ammonia oxidation reaction in the anaerobic ammonia oxidation reactor 2. The nitrogen gas is collected using the gas collection chamber 2.10. Once the gas volume reaches a set value (set value = effective liquid level of the anaerobic ammonia oxidation reactor * 10 * 1.2), it flows through the second automatic regulating valve 2.6 and the nitrogen circulation pipeline 2.9 into the air inlet of the aeration pipeline 2.14. The aeration pipeline 2.14 is used to mix and stir the sludge in the reactor. The control of this process mainly depends on the gas volume Q of the nitrogen circulation pipeline.气1 The aeration blower used to supply air to the anaerobic ammonia oxidation tank is designed with a flow rate of Q. 风机 Aeration volume Q in aeration pipeline 曝气 Then Q 气1 =Q 风机 -Q 曝气 As the anaerobic ammonia oxidation reaction continues, the gas volume in the gas collection chamber 2.10 will gradually accumulate. When the pressure sensor 2.8 detects that the pressure in the gas collection chamber reaches the release threshold (greater than the set value, preferably twice the design value), the first automatic regulating valve 2.5 will automatically open to release nitrogen into the atmosphere. When the pressure sensor 2.8 detects that the pressure in the gas collection chamber drops to the stop release threshold (not greater than the release threshold, preferably 0.8 times the release threshold), the first automatic regulating valve 2.5 will automatically close to maintain a certain aeration gas volume in the reaction tank.

[0036] The anaerobic ammonia oxidation reactor 2 of this invention is connected to an online dissolved oxygen meter 2.2, an online nitrite nitrogen meter 2.3, an online nitrate nitrogen meter 2.11, and a second online ammonia nitrogen meter 2.12. The aeration blower 2.17 is interlocked with the online dissolved oxygen meter 2.2, the online nitrite nitrogen meter 2.3, and the online nitrate nitrogen meter 2.11. When the dissolved oxygen concentration is ≥ the first threshold (0.5 mg / L), and the nitrate nitrogen concentration shows a positive increasing trend with the highest increasing concentration c... 硝态氮 ≥The second threshold (20 mg / L) and the nitrite nitrogen concentration showed an inverse increasing trend with the minimum concentration c 亚硝态 If any one of the three conditions—nitrogen ≤ third threshold (5 mg / L)—is met, the aeration rate of aerator 2.17 is reduced until it is shut down. Otherwise, the aeration rate of aerator 2.17 is increased, specifically when dissolved oxygen concentration < 0.5 mg / L, nitrite nitrogen concentration cnitrite > 5, and nitrate nitrogen concentration cnitrate < 50 mg / L. Through this interlocking control, the anaerobic ammonia oxidation process is maintained in a stable operating state, and the anaerobic ammonia oxidation removal efficiency of anaerobic ammonia oxidation reactor 2 is determined using the second online ammonia nitrogen meter 2.12.

[0037] The effluent outlet of the anaerobic ammonia oxidation reactor 2 of the present invention is connected to the inlet of the sedimentation tank 2.23 via the reactor effluent outlet pipe 2.13. The effluent outlet of the sedimentation tank 2.23 is connected to the inlet of the product water tank 3 via the sedimentation tank effluent outlet pipe 2.24. The effluent from the product water tank 3 is discharged externally or enters the next process. The sludge outlet of the sedimentation tank 2.23 is connected to a sludge return pipe 2.19 and a sludge discharge pipe 2.22. The other end of the sludge return pipe 2.19 is connected to the sludge inlet of the anaerobic ammonia oxidation reactor 2. A sludge return pump 2.20 is installed on the sludge return pipe 2.19, and a sludge discharge pump 2.21 is installed on the sludge discharge pipe 2.22. During use, the effluent from the anammox reaction flows into the sedimentation tank 2.23 for sludge-water separation. The supernatant flows into the permeate tank 3, and part of the bottom sludge is returned to the anammox reaction tank 2 via the sludge return pump 2.20 to maintain the sludge concentration in the anammox reaction tank 2. The rest is discharged to the sludge tank via the sludge discharge pump 2.21.

[0038] This invention achieves the aforementioned interlocking control through an automatic control module on the automatic control cabinet 4. The automatic control module includes an influent pre-conditioning control module, a nitrogen recycling control module, and an anaerobic ammonia oxidation stable operation control module. Firstly, it maintains the influent ammonia nitrogen concentration within a certain range by interlocking the acid and alkali dosing and permeate return flow through online instruments and parameter settings. Secondly, it achieves mixing and stirring of the reaction unit through the gas collection chamber and automatic valves, and adjusts the sludge rising velocity by controlling the circulating gas volume to cultivate granular sludge. Thirdly, it achieves automatic and stable operation of the reaction unit through interlocking with the aeration system via online instruments.

[0039] The inlet water pre-conditioning control module is equipped with an online instrument ammonia nitrogen and pH value display program, a pH value upper and lower limit setting program, an interlocking control program between the pH online instrument and the alkali dosing system and the acid dosing system, and an interlocking control program between the first ammonia nitrogen online instrument and the product water return pump.

[0040] The nitrogen recycling control module is equipped with a pressure sensor value display program, a first gas flow meter display program, a second gas flow meter display program, and a pressure sensor and first automatic regulating valve interlock control program.

[0041] The anaerobic ammonia oxidation stable operation control module is equipped with a program for displaying the values ​​of dissolved oxygen, ammonia nitrogen, nitrate nitrogen, and nitrite nitrogen, a program for displaying the third gas flow meter, a program for inputting and setting the value of nitrate nitrogen and nitrite nitrogen change amplitude, and a program for interlocking control between the aeration blower and the online dissolved oxygen, nitrite nitrogen, and nitrate nitrogen instruments.

[0042] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A high-efficiency denitrification device with stable influent, energy-saving, and automatic operation, characterized in that, include: The influent preconditioning tank, anaerobic ammonia oxidation reaction tank, sedimentation tank and product water tank are arranged sequentially along the high ammonia nitrogen wastewater treatment direction. Part of the effluent from the product water tank is returned to the influent preconditioning tank through a product water return pump. The inlet preconditioning tank is connected to an alkali dosing system, an acid dosing system, an online pH meter, and an online ammonia nitrogen meter. A mixer is installed inside the inlet preconditioning tank. The first online ammonia nitrogen meter is interlocked with the permeate return pump, and the online pH meter is interlocked with the alkali dosing system and the acid dosing system; Adjust the permeate return flow rate and acid / alkali dosage by setting the range of ammonia nitrogen and pH value; The top of the anaerobic ammonia oxidation reactor is formed by a gas collection hood, creating a closed gas collection chamber. The bottom of the reactor is equipped with an aeration pipeline. The top outlet of the gas collection hood is connected to a nitrogen exhaust pipeline and a nitrogen circulation pipeline, respectively. The inlet of the aeration pipeline is connected to the nitrogen circulation pipeline and the air intake system. The anaerobic ammonia oxidation reactor is equipped with online dissolved oxygen, nitrite, nitrate nitrogen, and a second ammonia nitrogen meter. The air intake system is interlocked with the online dissolved oxygen, nitrite, and nitrate nitrogen meters. When dissolved oxygen concentration is ≥ the first threshold, nitrate nitrogen concentration shows a positive increasing trend and the highest increasing concentration is c. 硝态氮 The concentrations of ≥2000 nitrate nitrogen and nitrite nitrogen show an inverse increasing trend, with the minimum concentration c being the lowest. 亚硝态氮 If any one of the three conditions ≤ the third threshold is met, the aeration volume of the air intake system is reduced until the air intake system is shut down; otherwise, the aeration volume of the aeration fan is increased; the nitrogen exhaust pipe is equipped with a first gas flow meter and a first automatic regulating valve, the nitrogen circulation pipe is equipped with a second gas flow meter and a second automatic regulating valve, and the gas collection hood is equipped with a pressure sensor; the pressure sensor is interlocked with the first automatic regulating valve, and the opening pressure of the first automatic regulating valve is greater than the opening pressure of the second automatic regulating valve; The sludge outlet of the sedimentation tank is connected to a sludge return pipeline and a sludge discharge pipeline, respectively. The other end of the sludge return pipeline is connected to the sludge inlet of the anaerobic ammonia oxidation reactor. A sludge return pump is installed on the sludge return pipeline, and a sludge discharge pump is installed on the sludge discharge pipeline.

2. The high-efficiency denitrification device as described in claim 1, characterized in that, The influent preconditioning tank is equipped with a sewage influent pipeline. The outlet of the influent preconditioning tank is connected to the influent of the anaerobic ammonia oxidation reactor via a first influent pump. The reflux outlet of the product water tank is connected to the reflux outlet of the influent preconditioning tank via a product water reflux pipeline. A product water reflux pump is installed on the product water reflux pipeline.

3. The high-efficiency denitrification device as described in claim 2, characterized in that, During operation, nitrogen gas is generated during the anaerobic ammonia oxidation reaction in the wastewater reactor. The nitrogen gas is collected in the gas collection chamber. Once the gas volume reaches the set value, it flows through the second automatic regulating valve and the nitrogen circulation pipeline into the air inlet of the aeration pipeline. The aeration pipeline is used to mix and stir the sludge in the reactor. As the anaerobic ammonia oxidation reaction continues, the gas volume in the gas collection chamber gradually accumulates. When the pressure sensor detects that the pressure in the gas collection chamber has reached the release threshold, the first automatic regulating valve automatically opens to release nitrogen gas. When the pressure sensor detects that the pressure in the gas collection chamber has dropped to the stop release threshold, the first automatic regulating valve automatically closes to maintain a certain aeration volume in the reactor.

4. The high-efficiency denitrification device as described in claim 3, characterized in that, The air intake system includes an aeration blower, the air outlet of which is connected to the air inlet of the aeration pipeline via an air intake pipe, and the air intake pipe is equipped with a third gas flow meter and a third automatic regulating valve.

5. The high-efficiency denitrification device as described in claim 4, characterized in that, The outlet of the anaerobic ammonia oxidation reactor is connected to the inlet of the sedimentation tank via a reactor outlet pipe, and the outlet of the sedimentation tank is connected to the inlet of the product water tank via a sedimentation tank outlet pipe.

6. The high-efficiency denitrification device as described in claim 5, characterized in that, The first threshold is a dissolved oxygen concentration of 0.5 mg / L, and the second threshold is the highest positive growth concentration of nitrate nitrogen, c. 硝态氮 =20 mg / L, the third threshold is the minimum concentration of nitrite nitrogen in reverse growth c 亚硝态氮 =5mg / L.

7. The high-efficiency denitrification device as described in claim 6, characterized in that, Interlocking control is achieved through the automatic control module on the automatic control cabinet. The automatic control module includes an influent pre-conditioning control module, a nitrogen recycling control module, and an anaerobic ammonia oxidation stable operation control module. The inlet water pre-conditioning control module is equipped with an online instrument ammonia nitrogen and pH value display program, a pH value upper and lower limit setting program, an interlocking control program between the pH online instrument and the alkali dosing system and the acid dosing system, and an interlocking control program between the first ammonia nitrogen online instrument and the product water return pump. The nitrogen recycling control module is equipped with a pressure sensor value display program, a first gas flow meter display program, a second gas flow meter display program, and a pressure sensor and first automatic regulating valve interlock control program. The anaerobic ammonia oxidation stable operation control module is equipped with a program for displaying the values ​​of dissolved oxygen, ammonia nitrogen, nitrate nitrogen, and nitrite nitrogen, a program for displaying the third gas flow meter, a program for inputting and setting the value of nitrate nitrogen and nitrite nitrogen change amplitude, and a program for interlocking control between the aeration blower and the online dissolved oxygen, nitrite nitrogen, and nitrate nitrogen instruments.

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