Device for efficient denitrification of biogas slurry by anaerobic ammonia oxidation coupling deep denitrification

Abstract

The device comprises a pretreatment unit and a PLC (Programmable Logic Controller), a denitrification reaction unit is arranged on one side of the pretreatment unit, and a deep denitrification unit is arranged on one side of the denitrification reaction unit. According to the utility model, the biogas slurry is flocculated through the flocculation tank, flocculate can be stood and settled through the settling tank, so that part of SS and COD can be removed, the biogas slurry sequentially passes through the three-phase separator, the carrier and the activated sludge to react, primary denitrification is realized, the denitrified biogas slurry can circulate in the reaction tank through the cooperation of the spray header and the transmission unit, and the denitrification effect is improved. The biogas slurry is fully reacted through the composite filler, so that deep denitrification is achieved, by adopting the activated sludge required by anaerobic ammonia oxidation, the carrier adsorbed with the denitrification biological strain and the composite filler, low-carbon-nitrogen-ratio wastewater can be denitrified under the condition that a carbon source does not need to be added, so that the project wastewater can be discharged up to the standard, and the wastewater can be recycled. And the operation cost of wastewater treatment can be saved.

Description

A device for efficient nitrogen removal from biogas slurry using anaerobic ammonia oxidation coupled with deep denitrification. Technical Field

[0001] This utility model relates to the field of biogas slurry denitrification technology, specifically to a device for efficient denitrification of biogas slurry using anaerobic ammonia oxidation coupled with deep denitrification. Background Technology

[0002] With rapid economic growth and improved living standards, the catering industry has developed and expanded rapidly, resulting in a growing amount of food waste. Food waste has a moisture content of about 87%, which leads to a large amount of wastewater being generated during its treatment. Food waste slurry has high pollutant concentration, complex composition, and high ammonia nitrogen content, making it a high-concentration organic wastewater that is difficult to treat.

[0003] Nitrogen pollution is one of the most important pollution problems facing humanity. The main harms of nitrogen pollution include: First, harm to water bodies: eutrophication; Second, harm to aquatic animals: eutrophication causes a rapid drop in dissolved oxygen, leading to the death of large numbers of aquatic animals due to oxygen deprivation; Third, impact on human health: when water bodies are polluted by nitrogenous organic matter, disinfection of drinking water produces harmful byproducts, increasing the risk of cancer. Therefore, nitrogen removal is a crucial issue currently facing water treatment.

[0004] Currently, biogas slurry denitrification technologies are classified into three main categories based on their reaction principles: physical technology, chemical technology, and biological technology. Biological methods are generally considered to be the most economical and effective method. However, for biogas slurry, which has a low carbon-to-nitrogen ratio, a large amount of organic carbon source needs to be added to achieve total nitrogen removal, resulting in the generation of a large amount of residual sludge and thus high operating costs.

[0005] Therefore, we propose a device for efficient nitrogen removal from biogas slurry by anaerobic ammonia oxidation coupled with deep denitrification to solve this problem. Summary of the Invention

[0006] The purpose of this invention is to provide a device for efficient denitrification of biogas slurry using anaerobic ammonia oxidation coupled with deep denitrification. This device has the advantages of cost savings and high removal rate. It solves the problem that biogas slurry denitrification technology is divided into three categories according to reaction principle: physical technology, chemical technology, and biological technology. Biological methods are generally considered to be the most economical and effective method. However, for biogas slurry, which has a low carbon-to-nitrogen ratio, a large amount of organic carbon source needs to be added to achieve total nitrogen removal, resulting in the generation of a large amount of residual sludge and thus high operating costs.

[0007] To achieve the above objectives, this utility model provides the following technical solution: an anaerobic ammonia oxidation coupled with deep denitrification device for efficient denitrification of biogas slurry, comprising a pretreatment unit and a PLC controller. A denitrification reaction unit is arranged on one side of the pretreatment unit, and a deep denitrification unit is arranged on one side of the denitrification reaction unit. A transmission unit is provided between the pretreatment unit, the denitrification reaction unit, and the deep denitrification unit. The pretreatment unit includes a flocculation tank, and a sedimentation tank is arranged on one side of the flocculation tank. A first transmission pump is arranged between the sedimentation tank and the flocculation tank. The inlet and outlet of the first transmission pump are respectively connected to the flocculation tank and the sedimentation tank. The denitrification reaction unit includes an anaerobic ammonia oxidation reactor. Furthermore, a three-phase separator is installed at the upper end of the inner cavity of the anammox reactor, and activated sludge required for anammox is installed at the lower end of the inner cavity of the anammox reactor. A carrier containing denitrifying bacteria is installed between the activated sludge and the three-phase separator. A transmission pipe is connected to the upper end of one side of the anammox reactor. The deep denitrification unit includes a reaction tank. A spray head is installed at the upper end of the inner cavity of the reaction tank, and one end of the transmission pipe is connected to the spray head. Composite packing is installed at the lower end of the inner cavity of the reaction tank. An air pump is installed on one side of the denitrification reaction unit. A three-way pipe is connected to the outlet of the air pump, and the other two ends of the three-way pipe are connected to the anammox reactor and the reaction tank, respectively.

[0008] Preferably, the carrier is a Raschig ring, a step ring, or a Pall ring, and the composite filler is a calcium carbonate and sulfur composite material loaded with denitrifying bacteria.

[0009] Preferably, the top of the flocculation tank is movably connected to a cover, and the top of the cover is connected to a liquid injection hopper. The top of the cover is fixedly connected to a motor, and the output shaft of the motor is driven to connect to a stirring paddle. The stirring paddle extends into the inner cavity of the flocculation tank and is movably connected to the inner cavity of the flocculation tank.

[0010] Preferably, the bottom of the sedimentation tank is connected to a discharge hopper, the surface of the discharge hopper is connected to a first solenoid valve, one side of the reaction tank is connected to a drain pipe, and the surface of the drain pipe is connected to a second solenoid valve.

[0011] Preferably, both the anaerobic ammonia oxidation reactor and the reaction tank are equipped with pH meters and dissolved oxygen meters, and the output terminals of the pH meters and dissolved oxygen meters are electrically connected to the input terminal of the PLC controller.

[0012] Preferably, the transmission unit includes a second transmission pump, a first reflux pump, and a second reflux pump. The inlet of the second transmission pump is connected to the sedimentation tank, and the outlet of the second transmission pump is connected to the anaerobic ammonia oxidation reactor. The inlet of the first reflux pump is connected to the upper end of one side of the anaerobic ammonia oxidation reactor, and the outlet of the first reflux pump is connected to the lower end of one side of the anaerobic ammonia oxidation reactor. The inlet of the second reflux pump is connected to the lower end of one side of the reaction tank, and the outlet of the second reflux pump is connected to the transmission pipe. The inputs of the motor, the first solenoid valve, and the second solenoid valve are all electrically connected to the output of the PLC controller. The output of the PLC controller is electrically connected to the inputs of the first transmission pump, the second transmission pump, the first reflux pump, and the second reflux pump, respectively.

[0013] Preferably, the efficient nitrogen removal method for biogas slurry includes the following steps:

[0014] S. First, the activated sludge containing anaerobic ammonia oxidizing bacteria and the carrier loaded with anaerobic ammonia oxidizing bacteria are filled into the interior of the anaerobic ammonia oxidation reactor. Then, the denitrifying bacteria are loaded onto the composite packing to complete the preparation work.

[0015] S. Biogas slurry pretreatment:

[0016] S. First, the biogas slurry enters the flocculation tank through the injection hopper. Then, flocculant is injected into the flocculation tank through the injection hopper, so that the flocculant can flocculate the impurities in the biogas slurry. At the same time, the motor is turned on by the PLC controller. The output shaft of the motor will drive the stirring paddle to rotate. The stirring paddle will drive the biogas slurry and flocculant to rotate, so that they are fully mixed and quickly flocculated, thus accelerating the flocculation efficiency.

[0017] S. After flocculation is completed, the first transfer pump is started by the PLC controller. The first transfer pump transfers the flocculated biogas slurry to the inner cavity of the sedimentation tank. The biogas slurry is allowed to settle in the inner cavity of the sedimentation tank, so that the flocculants and sludge in the biogas slurry can fall and settle, thus achieving solid-liquid separation.

[0018] S. Reactive denitrification treatment: First, the second transfer pump, the first reflux pump, and the air pump are started by the PLC controller. The second transfer pump transfers the liquid inside the sedimentation tank to the inner cavity of the anaerobic ammonia oxidation reactor. At the same time, the air pump injects gas into the anaerobic ammonia oxidation reactor, and the first reflux pump circulates the liquid inside the anaerobic ammonia oxidation reactor. The liquid then frequently passes through the three-phase separator, carrier, and activated sludge to react, thereby gradually achieving denitrification. During the denitrification process, the liquid is monitored in real time by a pH meter and a dissolved oxygen meter, and the monitoring data is transmitted to the PLC controller for analysis until the liquid reaches the transfer standard, at which point the next transfer can be carried out.

[0019] S. Deep Denitrification Treatment: After preliminary denitrification, the liquid gradually overflows upwards inside the anaerobic ammonia oxidation reactor. It is then transported to the inner cavity of the spray head via a transfer pipe. The spray head, in conjunction with the second reflux pump, enables the liquid to circulate within the reaction tank, allowing it to frequently pass through the composite packing material. The composite packing material reacts with the liquid during the reaction. During the reaction, the liquid is monitored in real time using a pH meter and dissolved oxygen meter, and the monitoring data is transmitted to the PLC controller for analysis. Once the liquid meets the discharge standards, the second solenoid valve is opened via the PLC controller, and the biogas slurry is discharged through the drain pipe, thus achieving deep denitrification of the biogas slurry.

[0020] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0021] This invention uses a flocculation tank to treat biogas slurry, while a first transfer pump transports the flocculated biogas slurry to a sedimentation tank. The sedimentation tank allows the flocculated impurities to settle, removing some suspended solids (SS) and carbon dioxide (COD). The biogas slurry then passes through a three-phase separator, a carrier, and activated sludge for reaction. Gas is injected into the anaerobic ammonia oxidation reactor via a gas pump. The gas and biogas slurry circulate within the reactor via a transfer unit, ensuring thorough reaction. After denitrification, the biogas slurry overflows upwards and enters a spray head through a transfer pipe. The spray head, in conjunction with the transfer unit, allows the biogas slurry to circulate within the reaction tank, ensuring it undergoes thorough reaction with the composite packing material. This achieves deep denitrification, meeting the discharge standards for municipal wastewater treatment. By using activated sludge, a carrier adsorbing denitrifying bacteria, and composite packing material required for anaerobic ammonia oxidation, low C / N ratio wastewater can be denitrified without the need for carbon source addition. This ensures that the project's wastewater meets discharge standards while saving on wastewater treatment operating costs. Attached Figure Description

[0022] Figure 1 is a schematic diagram of the structure of this utility model;

[0023] Figure 2 is a schematic diagram of the reaction tank structure of this utility model;

[0024] Figure 3 is a cross-sectional structural diagram of the flocculation tank of this utility model;

[0025] Figure 4 is a partial cross-sectional view of the anaerobic ammonia oxidation reactor of this utility model;

[0026] Figure 5 is a schematic diagram of the system principle of this utility model.

[0027] In the diagram: 1. Pretreatment unit; 11. Flocculation tank; 111. Cover; 112. Injection hopper; 113. Motor; 114. Agitator; 12. Sedimentation tank; 121. Discharge hopper; 122. First solenoid valve; 13. First transfer pump; 2. Denitrification reaction unit; 21. Anaerobic ammonia oxidation reactor; 22. Three-phase separator; 23. Carrier; 24. Activated sludge; 25. Transfer pipe; 3. Deep denitrification unit; 31. Reaction tank; 311. Drainage pipe; 312. Second solenoid valve; 32. Composite packing; 33. Spray head; 4. Transfer unit; 41. Second transfer pump; 42. First reflux pump; 43. Second reflux pump; 5. PLC controller; 6. Air pump. Detailed Implementation

[0028] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0029] The components of this utility model, including the pretreatment unit 1, flocculation tank 11, cover 111, injection hopper 112, motor 113, stirring paddle 114, sedimentation tank 12, discharge hopper 121, first solenoid valve 122, first transfer pump 13, denitrification reaction unit 2, anaerobic ammonia oxidation reactor 21, three-phase separator 22, carrier 23, activated sludge 24, deep denitrification unit 3, reaction tank 31, composite packing 32, spray head 33, transfer unit 4, second transfer pump 41, first reflux pump 42, and second reflux pump 43, are all general standard parts or parts known to those skilled in the art. Their structure and principle can be learned by those skilled in the art through technical manuals or conventional experimental methods.

[0030] Example 1

[0031] As shown in Figures 1-5, this is the first embodiment of the present invention. This embodiment provides an anaerobic ammonia oxidation coupled with deep denitrification for efficient denitrification of biogas slurry. It includes a pretreatment unit 1 and a PLC controller 5. A denitrification reaction unit 2 is located on one side of the pretreatment unit 1, and a deep denitrification unit 3 is located on one side of the denitrification reaction unit 2. A transmission unit 4 is provided between the pretreatment unit 1, the denitrification reaction unit 2, and the deep denitrification unit 3. The pretreatment unit 1 includes a flocculation tank 11, and a sedimentation tank 12 is located on one side of the flocculation tank 11. A first transmission pump 13 is provided between the sedimentation tank 12 and the flocculation tank 11. The inlet and outlet of the first transmission pump 13 are connected to the flocculation tank 11 and the sedimentation tank 12, respectively. The denitrification reaction unit 2 includes an anaerobic ammonia oxidation reactor 21. The anammox reactor 21 has a three-phase separator 22 at the upper end of its inner cavity and activated sludge 24 required for anammox at the lower end of its inner cavity. A carrier 23 containing denitrifying bacteria is placed between the activated sludge 24 and the three-phase separator 22. A transmission pipe 25 is connected to the upper end of one side of the anammox reactor 21. The deep denitrification unit 3 includes a reaction tank 31. A spray head 33 is provided at the upper end of the inner cavity of the reaction tank 31, and one end of the transmission pipe 25 is connected to the spray head 33. A composite packing 32 is provided at the lower end of the inner cavity of the reaction tank 31. An air pump 6 is provided on one side of the denitrification reaction unit 2. A three-way pipe is connected to the outlet of the air pump 6, and the other two ends of the three-way pipe are connected to the anammox reactor 21 and the reaction tank 31, respectively.

[0032] The carrier 23 is a Raschig ring, a step ring, or a Pall ring, and the composite filler 32 is a composite of calcium carbonate and sulfur, and is loaded with denitrifying bacteria.

[0033] As shown in Figures 1-5, the biogas slurry is flocculated in the flocculation tank 11. Simultaneously, the first transfer pump 13 transfers the flocculated biogas slurry to the sedimentation tank 12. The sedimentation tank 12 allows the flocculated impurities to settle, thereby removing some SS and COD. The biogas slurry then passes sequentially through the three-phase separator 22, carrier 23, and activated sludge 24 for reaction. Gas is injected into the anaerobic ammonia oxidation reactor 21 via the air pump 6. The gas and biogas slurry circulate within the anaerobic ammonia oxidation reactor 21 via the transfer unit 4, ensuring complete reaction. After denitrification, the biogas slurry is then... The overflowing biogas slurry can enter the spray head 33 through the transmission pipe 25. The spray head 33, together with the transmission unit 4, can make the biogas slurry circulate inside the reaction tank 31, so that the biogas slurry can fully react through the composite packing 32, thereby achieving deep denitrification and making it meet the discharge standards. By using the activated sludge 24 required for anaerobic ammonia oxidation, the carrier 23 adsorbed with denitrifying biological bacteria, and the composite packing 32, low carbon-to-nitrogen ratio wastewater can be denitrified without the addition of carbon source. This can not only make the project wastewater meet the discharge standards, but also save the operating cost of wastewater treatment.

[0034] Example 2

[0035] Referring to Figure 3, this is the second embodiment of the present invention, which is based on the previous embodiment.

[0036] In this embodiment, a cover 111 is movably connected to the top of the flocculation tank 11, and a liquid injection hopper 112 is connected to the top of the cover 111. A motor 113 is fixedly connected to the top of the cover 111, and an agitator 114 is drivenly connected to the output shaft of the motor 113. The agitator 114 extends into the inner cavity of the flocculation tank 11 and is movably connected to the inner cavity of the flocculation tank 11.

[0037] The bottom of the sedimentation tank 12 is connected to a discharge hopper 121, and the surface of the discharge hopper 121 is connected to a first solenoid valve 122. One side of the reaction tank 31 is connected to a drain pipe 311, and the surface of the drain pipe 311 is connected to a second solenoid valve 312.

[0038] As shown in Figure 3, the flocculation tank 11 can be sealed by the cover 111, and the injection hopper 112 facilitates the transfer of biogas slurry and flocculant into the interior of the flocculation tank 11. At the same time, the output shaft of the motor 113 can drive the stirring paddle 114 to rotate, thereby accelerating the reaction effect of biogas slurry and flocculant. By opening the first solenoid valve 122, the sludge and flocculants inside the sedimentation tank 12 can be discharged through the discharge hopper 121. By opening the second solenoid valve 312, the biogas slurry inside the reaction tank 31 can be discharged through the discharge pipe 311.

[0039] Example 3

[0040] Referring to Figures 1 and 5, this is the third embodiment of the present invention, which is based on the first two embodiments.

[0041] In this embodiment, both the anaerobic ammonia oxidation reactor 21 and the reaction tank 31 are equipped with pH meters and dissolved oxygen meters, and the output terminals of the pH meters and dissolved oxygen meters are electrically connected to the input terminal of the PLC controller 5.

[0042] The transmission unit 4 includes a second transmission pump 41, a first reflux pump 42, and a second reflux pump 43. The inlet of the second transmission pump 41 is connected to the sedimentation tank 12, and the outlet of the second transmission pump 41 is connected to the anaerobic ammonia oxidation reactor 21. The inlet of the first reflux pump 42 is connected to the upper end of one side of the anaerobic ammonia oxidation reactor 21, and the outlet of the first reflux pump 42 is connected to the lower end of one side of the anaerobic ammonia oxidation reactor 21. The inlet of the second reflux pump 43 is connected to the lower end of one side of the reaction tank 31, and the outlet of the second reflux pump 43 is connected to the transmission pipe 25. The inputs of the motor 113, the first solenoid valve 122, and the second solenoid valve 312 are all electrically connected to the output of the PLC controller 5. The output of the PLC controller 5 is electrically connected to the inputs of the first transmission pump 13, the second transmission pump 41, the first reflux pump 42, and the second reflux pump 43, respectively.

[0043] As shown in Figures 1 and 5, the biogas slurry inside the sedimentation tank 12 can be transferred to the anaerobic ammonia oxidation reactor 21 for reaction by the second transfer pump 41. The biogas slurry inside the anaerobic ammonia oxidation reactor 21 can be self-circulated by the first return pump 42 to accelerate the reaction efficiency. At the same time, the biogas slurry inside the reaction tank 31 can be self-circulated to accelerate the reaction efficiency and enable it to quickly remove nitrogen.

[0044] A method for efficient nitrogen removal from biogas slurry using anaerobic ammonia oxidation coupled with deep denitrification includes the following steps:

[0045] S1. First, the activated sludge 24 containing anaerobic ammonia oxidizing bacteria and the carrier 23 loaded with anaerobic ammonia oxidizing bacteria are filled into the interior of the anaerobic ammonia oxidation reactor 21. Then, the denitrifying bacteria are loaded onto the composite packing 32 to complete the preparation work.

[0046] S2. Biogas slurry pretreatment:

[0047] S21. First, the biogas slurry enters the flocculation tank 11 through the injection hopper 112. Then, flocculant is injected into the flocculation tank 11 through the injection hopper 112, so that the flocculant can flocculate the impurities in the biogas slurry. At the same time, the motor 113 is turned on by the PLC controller 5. The output shaft of the motor 113 will drive the stirring paddle 114 to rotate. The stirring paddle 114 drives the biogas slurry and flocculant to rotate, so that they are fully mixed and quickly flocculated, thus accelerating the flocculation efficiency.

[0048] S22. After flocculation is completed, the first transfer pump 13 is turned on by the PLC controller 5. The first transfer pump 13 transfers the flocculated biogas slurry to the inner cavity of the sedimentation tank 12. The biogas slurry is allowed to stand in the inner cavity of the sedimentation tank 12, so that the flocculants and sludge in the biogas slurry can fall and settle, thus achieving solid-liquid separation.

[0049] S3. Reaction-based denitrification treatment: First, the second transfer pump 41, the first reflux pump 42, and the air pump 6 are turned on by the PLC controller 5. The second transfer pump 41 transfers the liquid inside the sedimentation tank 12 to the inner cavity of the anaerobic ammonia oxidation reactor 21. At the same time, the air pump 6 injects gas into the anaerobic ammonia oxidation reactor 21, and the first reflux pump 42 circulates the liquid inside the anaerobic ammonia oxidation reactor 21. The liquid then frequently passes through the three-phase separator 22, the carrier 23, and the activated sludge 24 to react, thereby gradually achieving denitrification treatment of the liquid. During the denitrification process, the liquid is monitored in real time by a pH meter and a dissolved oxygen meter, and the monitoring data is transmitted to the PLC controller 5 for analysis until the liquid reaches the transfer standard, at which point the next transfer can be carried out.

[0050] S4. Deep Denitrification Treatment: The liquid after preliminary denitrification treatment will gradually overflow upwards inside the anaerobic ammonia oxidation reactor 21. The liquid can be transferred to the inner cavity of the spray head 33 through the transmission pipe 25. The spray head 33, together with the second reflux pump 43, can realize the circulation of the liquid inside the reaction tank 31, so that the liquid frequently passes through the composite packing 32 and reacts with the liquid through the composite packing 32. During the reaction, the liquid is monitored in real time by a pH meter and a dissolved oxygen meter, and the monitoring data is transmitted to the PLC controller 5 for analysis. When the liquid reaches the discharge standard, the second solenoid valve 312 can be opened by the PLC controller 5, and the biogas slurry will be discharged through the drain pipe 311, thereby realizing the deep denitrification of the biogas slurry.

[0051] All standard parts used in this application can be purchased from the market, and can be customized according to the description and drawings. The specific connection methods of each part adopt conventional methods such as bolts, rivets, and welding that are mature in the prior art. The machinery, parts and equipment adopt conventional models in the prior art. The control method is automatic control through a controller. The control circuit of the controller can be implemented by simple programming by those skilled in the art and is common knowledge in the field. Since this application is mainly used to protect mechanical devices, the control method and circuit connection will not be explained in detail in this application.

[0052] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0053] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A device for efficient denitrification of biogas slurry using anaerobic ammonia oxidation coupled deep denitrification, comprising a pretreatment unit (1) and a PLC controller (5), characterized in that: A denitrification reaction unit (2) is provided on one side of the pretreatment unit (1), and a deep denitrification unit (3) is provided on one side of the denitrification reaction unit (2). A transfer unit (4) is provided between the pretreatment unit (1), the denitrification reaction unit (2), and the deep denitrification unit (3). The pretreatment unit (1) includes a flocculation tank (11), and a sedimentation tank (12) is provided on one side of the flocculation tank (11). A first transfer pump (13) is provided between the sedimentation tank (12) and the flocculation tank (11). The inlet and outlet of the first transfer pump (13) are connected to the flocculation tank (11) and the sedimentation tank (12), respectively. The denitrification reaction unit (2) includes an anaerobic ammonia oxidation reactor (21), and a three-phase separator (22) is provided at the upper end of the inner cavity of the anaerobic ammonia oxidation reactor (21). The lower end of the inner cavity of the reactor (21) is provided with activated sludge (24) required for anaerobic ammonia oxidation. A carrier (23) adsorbing denitrifying bacteria is provided between the activated sludge (24) and the three-phase separator (22). A transmission pipe (25) is connected to the upper end of one side of the anaerobic ammonia oxidation reactor (21). The deep denitrification unit (3) includes a reaction tank (31). A spray head (33) is provided at the upper end of the inner cavity of the reaction tank (31), and one end of the transmission pipe (25) is connected to the spray head (33). A composite packing material (32) is provided at the lower end of the inner cavity of the reaction tank (31). An air pump (6) is provided on one side of the denitrification reaction unit (2). A three-way pipe is connected to the air outlet of the air pump (6), and the other two ends of the three-way pipe are connected to the anaerobic ammonia oxidation reactor (21) and the reaction tank (31) respectively.

2. The device for efficient nitrogen removal from biogas slurry using anaerobic ammonia oxidation coupled with deep denitrification as described in claim 1, characterized in that: The carrier (23) is a Raschig ring, a step ring, or a Pall ring, and the composite filler (32) is a calcium carbonate and sulfur composite material, and is loaded with denitrifying bacteria.

3. The device for efficient nitrogen removal from biogas slurry using anaerobic ammonia oxidation coupled with deep denitrification as described in claim 1, characterized in that: The top of the flocculation tank (11) is movably connected to a cover (111), and the top of the cover (111) is connected to a liquid injection hopper (112). The top of the cover (111) is fixedly connected to a motor (113), and the output shaft of the motor (113) is driven to a stirring paddle (114). The stirring paddle (114) extends into the inner cavity of the flocculation tank (11) and is movably connected to the inner cavity of the flocculation tank (11).

4. The device for efficient nitrogen removal from biogas slurry using anaerobic ammonia oxidation coupled with deep denitrification as described in claim 3, characterized in that: The bottom of the sedimentation tank (12) is connected to a discharge hopper (121), and the surface of the discharge hopper (121) is connected to a first solenoid valve (122). One side of the reaction tank (31) is connected to a drain pipe (311), and the surface of the drain pipe (311) is connected to a second solenoid valve (312).

5. The device for efficient nitrogen removal from biogas slurry using anaerobic ammonia oxidation coupled with deep denitrification according to claim 1, characterized in that: The anaerobic ammonia oxidation reactor (21) and the reaction tank (31) are both equipped with pH meters and dissolved oxygen meters, and the output terminals of the pH meters and dissolved oxygen meters are electrically connected to the input terminal of the PLC controller (5).

6. The device for efficient denitrification of biogas slurry using anaerobic ammonia oxidation coupled with deep denitrification according to claim 4, characterized in that: The transmission unit (4) includes a second transmission pump (41), a first reflux pump (42), and a second reflux pump (43). The inlet of the second transmission pump (41) is connected to the sedimentation tank (12), and the outlet of the second transmission pump (41) is connected to the anaerobic ammonia oxidation reactor (21). The inlet of the first reflux pump (42) is connected to the upper end of one side of the anaerobic ammonia oxidation reactor (21), and the outlet of the first reflux pump (42) is connected to the lower end of one side of the anaerobic ammonia oxidation reactor (21). The inlet of the reflux pump (43) is connected to the lower end of one side of the reaction tank (31), and the outlet of the second reflux pump (43) is connected to the transmission pipe (25). The input ends of the motor (113), the first solenoid valve (122) and the second solenoid valve (312) are all electrically connected to the output end of the PLC controller (5). The output end of the PLC controller (5) is electrically connected to the input ends of the first transmission pump (13), the second transmission pump (41), the first reflux pump (42) and the second reflux pump (43), respectively.

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