An internal circulation type anaerobic ammonia oxidation reactor

Abstract

The utility model discloses an air-lift internal circulation type ANAMMOX reactor relates to water treatment technical field, including outer cylinder, inner cylinder, filler assembly and aeration assembly, the bottom of outer cylinder is sealed, and the top is open, and the upper end outside wall is equipped with annular sedimentation area, and there is the water outlet ring joint that communicates with annular sedimentation area on the outer cylinder, the sewage mixed solution can enter annular sedimentation area through the water outlet ring joint in the inside of outer cylinder, and the sludge in annular sedimentation area can be refluxed to the inside of outer cylinder through the water outlet ring joint, and the supernatant is discharged from the top of annular sedimentation area, the inner cylinder is fixed in the inside of outer cylinder, and the annular cavity is between the two, the inner cylinder has inner cylinder upper opening and inner cylinder lower opening, and the inner cylinder upper opening is higher than the water outlet ring joint and is lower than the upper end of outer cylinder in vertical direction, and the inner cylinder lower opening is higher than the inner bottom of outer cylinder, the filler assembly is fixed in the inner cylinder, and has interval with the inner cylinder lower opening, and has filler, the aeration assembly is fixed in the bottom of filler, and provides oxygen, it can improve the impact resistance and denitrification load.

Description

Technical Field

[0001] This utility model relates to the field of water treatment technology, and in particular to an airlift internal circulation anaerobic ammonia oxidation reactor. Background Technology

[0002] Anaerobic ammonia oxidation technology is a highly efficient process for treating high ammonia nitrogen wastewater and is widely used in the treatment of pollutants in municipal, chemical, and kitchen wastewater treatment industries. Among them, anaerobic ammonia oxidation reactors, which are mainly based on biofilm, can achieve the synergistic removal of traditional pollutants and recalcitrant organic matter by relying on the immobilization of microorganisms by the biofilm.

[0003] However, existing anaerobic ammonia oxidation reactors are dominated by a single biofilm, which results in poor shock resistance and low nitrogen removal load during actual operation. Utility Model Content

[0004] The purpose of this invention is to provide an airlift-type internal circulation anaerobic ammonia oxidation reactor to solve the problems existing in the prior art and improve its shock resistance and denitrification load.

[0005] To achieve the above objectives, this utility model provides the following solution: This utility model provides an airlift-type internal circulation anaerobic ammonia oxidation reactor, including an outer cylinder, an inner cylinder, a packing assembly, and an aeration assembly; the bottom of the outer cylinder is sealed, and the top is open; an annular sedimentation zone is provided on the upper outer wall of the outer cylinder, and an effluent annular slit is provided on the outer cylinder to communicate with the annular sedimentation zone; the wastewater mixture inside the outer cylinder can enter the annular sedimentation zone through the effluent annular slit, and the settled sludge in the annular sedimentation zone can flow back to the interior of the outer cylinder through the effluent annular slit; the supernatant in the annular sedimentation zone can be discharged from above the annular sedimentation zone; the inner cylinder is solid. The inner cylinder is fixedly disposed inside the outer cylinder; an annular cavity exists between the inner cylinder and the outer cylinder; the inner cylinder has an upper opening and a lower opening; vertically, the upper opening is higher than the effluent annular seam and lower than the upper end of the outer cylinder; the lower opening is higher than the inner bottom of the outer cylinder, and the lower opening is used to allow the wastewater to be treated to flow upward; the packing assembly is fixedly disposed inside the inner cylinder, and there is a gap between the packing assembly and the lower opening; the packing assembly has packing material; the aeration assembly is fixedly disposed at the bottom of the packing material; and the aeration assembly is capable of providing oxygen.

[0006] Preferably, a water inlet distributor is fixedly installed inside the outer cylinder; the inlet of the water inlet distributor is used to introduce wastewater to be treated, and the outlet of the water inlet distributor is located directly below the lower opening of the inner cylinder.

[0007] Preferably, the height-to-diameter ratio of the outer cylinder is in the range of 3 to 5.

[0008] Preferably, the ratio of the inner diameter of the inner cylinder to the inner diameter of the outer cylinder is in the range of 0.7 to 0.9.

[0009] Preferably, an outer sleeve is fixedly fitted on the upper outer wall of the outer cylinder, and the lower end of the outer sleeve is connected to the outer wall of the outer cylinder through a tapered tube. The annular sedimentation zone is formed between the inner side of the tapered tube and the outer wall of the outer cylinder; the water outlet annular seam is located at the lowest point inside the tapered tube.

[0010] Preferably, the packing assembly includes a packing frame and the packing; the packing frame is fixedly disposed within the inner cylinder, and the packing is fixedly disposed within the packing frame; the height of the packing assembly is 30% to 60% of the height of the inner cylinder.

[0011] Preferably, the aeration assembly includes an extension pipe, an aeration main pipe, and multiple aeration branch pipes; the extension pipe is fixedly disposed within the inner cylinder; the lower end of the extension pipe is connected to the aeration main pipe, and each of the aeration branch pipes is fixedly disposed on the aeration main pipe and is connected to the aeration main pipe; each of the aeration branch pipes is provided with an aerator for blowing air into the inner cylinder.

[0012] Preferably, the aeration component is located at a depth of 5m to 8m below the liquid surface inside the outer cylinder.

[0013] Preferably, an effluent collector is also fixedly installed in the annular sedimentation zone; the upper end of the effluent collector is higher than the upper opening of the inner cylinder of the inner cylinder body.

[0014] The present invention achieves the following technical advantages over the prior art: This utility model provides an airlift-type internal circulation anaerobic ammonium oxidation reactor. Through the related arrangement of an outer cylinder, inner cylinder, packing assembly, and aeration assembly, the gas provided by the aeration assembly powers the internal circulation flow, achieving circulation through airlift. This drives the wastewater inside the inner cylinder to flow upwards, overflowing through the opening at the top of the inner cylinder and then circulating downwards along the annular cavity between the inner and outer cylinders. Under the action of high-speed internal circulation hydraulic flow, a large amount of granular sludge is formed within the reactor due to hydraulic shear force. In the packing area of ​​the packing assembly, biofilm-like sludge forms on the surface of the packing due to the action of the packing. Additionally, flocculent sludge exists throughout the reactor. Granular sludge is mainly present in the lower part of the inner cylinder, biofilm-like sludge is mainly present on the surface of the packing, and flocculent sludge essentially fills the entire reactor interior. Among the various sludge forms, the main denitrifying bacteria are short-cut nitrifying bacteria and anaerobic ammonium oxidizing bacteria. Ammonia nitrogen in the incoming wastewater undergoes short-cut nitrification and anaerobic ammonium oxidation within the reactor. The reaction achieves the goal of removing ammonia nitrogen and total nitrogen: The main area of ​​short-cut nitrification is the aeration zone above the aeration components, where short-cut nitrifying bacteria use oxygen to convert ammonia nitrogen into nitrite nitrogen; the anaerobic ammonia oxidation reaction occurs throughout the reactor, where anaerobic ammonia oxidizing bacteria react nitrite nitrogen with ammonia nitrogen to produce nitrogen gas and a small amount of nitrate nitrogen. However, the form of anaerobic ammonia oxidizing bacteria varies in different areas. In the packing area of ​​the packing components, anaerobic ammonia oxidizing bacteria are mainly found in the biofilm attached to the packing material; in other areas, they are mainly found in granular sludge and flocculent sludge. By constructing three sludge forms—granular sludge, biofilm, and flocculent sludge—the reactor has a high sludge concentration and a high abundance of denitrifying bacteria. The superposition of the three sludge forms results in a sludge concentration 2 to 5 times higher than that of ordinary reactors. Furthermore, it has stronger resistance to shocks caused by fluctuations in water volume and quality, solving the problems of poor shock resistance and low load in traditional anaerobic ammonia oxidation reactors that mainly use a single biofilm form. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0016] Figure 1 A schematic diagram of the overall structure of the airlift internal circulation anaerobic ammonia oxidation reactor provided by this utility model; Figure 2 This is a schematic diagram of the aeration components in the airlift internal circulation anaerobic ammonia oxidation reactor provided by this utility model.

[0017] In the picture: 1-Outer cylinder; 101-Outer sleeve; 102-Conical tube; 103-Outlet annular seam; 104-Annular sedimentation zone; 2-Inner cylinder; 3-Water inlet distributor; 4-Packaging frame; 5-Aeration assembly; 501-Extension pipe; 502-Main aeration pipe; 503-Aeration branch pipe; 6-Water collector. Detailed Implementation

[0018] 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.

[0019] The purpose of this invention is to provide an airlift-type internal circulation anaerobic ammonia oxidation reactor to solve the problems existing in the prior art and improve its shock resistance and denitrification load.

[0020] To make the above-mentioned objectives, features and advantages of this utility model more apparent and understandable, the utility model will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0021] Example 1 This embodiment provides an airlift internal circulation anaerobic ammonia oxidation reactor, such as... Figures 1-2As shown, the reactor includes an outer cylinder 1, an inner cylinder 2, a packing assembly, and an aeration assembly 5. The bottom of the outer cylinder 1 is sealed, and the top is open. An annular sedimentation zone 104 is provided on the upper outer wall of the outer cylinder 1. An outlet annular slit 103 is provided on the outer cylinder 1, which communicates with the annular sedimentation zone 104 (its function is to allow water to enter the annular sedimentation zone 104 evenly through the outlet annular slit 103, and for sludge to settle from the outlet annular slit 103 into the outer cylinder 1). The wastewater mixture inside the outer cylinder 1 can enter the annular sedimentation zone 104 through the outlet annular slit 103 (its function is to complete solid-liquid separation, with water continuing to flow upwards out of the entire reactor, and sludge settling downwards and flowing back into the outer cylinder 1 through the outlet annular slit 103, ensuring the amount of sludge inside the reactor and preventing sludge loss). The settled sludge in the sedimentation zone 104 can be returned to the interior of the outer cylinder 1 through the effluent annular gap 103, and the supernatant of the annular sedimentation zone 104 can be discharged from the top of the annular sedimentation zone 104; the inner cylinder 2 is fixedly installed inside the outer cylinder 1; there is an annular cavity between the inner cylinder 2 and the outer cylinder 1; the inner cylinder 2 has an upper opening and a lower opening; in the vertical direction, the upper opening of the inner cylinder is higher than the effluent annular gap 103 and lower than the upper end of the outer cylinder 1; the lower opening of the inner cylinder is higher than the inner bottom of the outer cylinder 1, and the lower opening of the inner cylinder is used to introduce wastewater to be treated upward; the packing assembly is fixedly installed inside the inner cylinder 2, and there is a gap between the packing assembly and the lower opening of the inner cylinder; the packing assembly has packing material; the aeration assembly 5 is fixedly installed at the bottom of the packing material; and the aeration assembly 5 can provide oxygen.

[0022] Through the arrangement of the outer cylinder 1, inner cylinder 2, packing assembly, and aeration assembly 5, the gas provided by the aeration assembly 5 powers the internal circulation flow, achieving circulation through air lift. This drives the wastewater in the inner cylinder 2 to flow upwards, overflowing through the opening at the top of the inner cylinder and then circulating downwards along the annular cavity between the inner cylinder 2 and the outer cylinder 1. Under the action of high-speed internal circulating hydraulic flow, a large amount of granular sludge is formed in the reactor due to the action of hydraulic shear force. In the packing area of ​​the packing assembly, due to the action of the packing, granular sludge forms on the surface of the packing. Biofilm sludge exists; additionally, flocculent sludge is present throughout the reactor. Granular sludge is mainly found in the lower part of the inner cylinder 2, biofilm sludge is mainly found on the surface of the packing material, and flocculent sludge basically fills the entire reactor interior. Among the various sludge forms, the main denitrifying bacteria are short-cut nitrifying bacteria and anaerobic ammonia oxidizing bacteria. Ammonia nitrogen in the wastewater undergoes short-cut nitrification and anaerobic ammonia oxidation reactions inside the reactor to remove ammonia nitrogen and total nitrogen. The main area where short-cut nitrification occurs is the aeration zone above aeration component 5. In this zone, short-range nitrifying bacteria utilize oxygen to convert ammonia nitrogen into nitrite nitrogen; anaerobic ammonia oxidation occurs throughout the reactor, where anaerobic ammonia oxidizing bacteria react nitrite nitrogen with ammonia nitrogen to produce nitrogen gas and a small amount of nitrate nitrogen. However, the forms in which anaerobic ammonia oxidizing bacteria exist differ in different zones. In the packing zone of the packing assembly, anaerobic ammonia oxidizing bacteria are mainly found within the biofilm attached to the packing material; in other zones, they are mainly found within granular sludge and flocculent sludge. This process constructs three sludge morphologies: granular sludge, biofilm, and flocculent sludge. The reactor has a high concentration of sludge and a high abundance of denitrifying bacteria. The three sludge forms are superimposed, and the sludge concentration inside the reactor is 2 to 5 times that of ordinary reactors (the sludge concentration inside the reactor can reach 20,000 to 30,000 mg / L, which is 2 to 5 times that of ordinary reactors. The effect of high sludge concentration is high load). Moreover, it has a stronger tolerance to the impact of water volume and water quality fluctuations on the reactor, and can solve the problems of poor shock resistance and low load of traditional airlift internal circulation anaerobic ammonia oxidation reactors that mainly use a single biofilm form.

[0023] The following are the relevant settings for the outer cylinder 1 and the inner cylinder 2: Specifically, under the influence of gas, the water flow pattern inside the reactor is as follows: water in the inner cylinder 2 flows upward, while water between the outer cylinder 1 and the inner cylinder 2 flows downward, forming a water circulation pattern within the reactor. The upward flow velocity of water in the inner cylinder 2 is between 60 and 240 m / h, and the downward flow velocity of water between the outer cylinder 1 and the inner cylinder 2 is between 180 and 360 m / h. Under the action of high-speed internal circulation hydraulic flow, the hydraulic shear force promotes particle formation, improves particle density and structural stability, and screens out granular sludge with good settling performance, eliminating loose flocculent sludge (in the inner cylinder 2, due to the fast upward flow velocity, granular sludge has good settling properties and high density, making it easy to retain; flocculent sludge is lighter and has lower density, making it easier to be carried away by the water flow).

[0024] Among the optional solutions in this embodiment, the more preferred one is as follows: Figure 1 As shown, an effluent collector 6 is also fixedly installed in the annular sedimentation zone 104 (the water passing through the annular sedimentation zone 104 is collected by the effluent collector 6 and flows out of the reactor); the upper end of the effluent collector 6 is higher than the opening on the inner cylinder of the inner cylinder 2.

[0025] Among the optional solutions in this embodiment, the more preferred one is as follows: Figure 1 As shown, a water inlet distributor 3 is fixedly installed inside the outer cylinder 1; the inlet of the water inlet distributor 3 is used to introduce wastewater to be treated, and the outlet of the water inlet distributor 3 is located directly below the lower opening of the inner cylinder.

[0026] Specifically, the design of the water inlet distributor 3 only needs to ensure the uniform distribution of water throughout the entire reactor. It is an existing device and will not be described in detail here.

[0027] Among the optional solutions in this embodiment, the more preferred one is as follows: Figure 1 As shown, an outer sleeve 101 is fixedly sleeved on the upper outer wall of the outer cylinder 1. The lower end of the outer sleeve 101 is connected to the outer wall of the outer cylinder 1 through a tapered tube 102. An annular sedimentation zone 104 is formed between the inner side of the outer sleeve 101 and the tapered tube 102 and the outer wall of the outer cylinder 1. The water outlet annular seam 103 is located at the lowest point inside the tapered tube 102.

[0028] In the optional embodiments of this example, it is more preferred that the height-to-diameter ratio of the outer cylinder 1 is in the range of 3 to 5. Specifically, a larger height-to-diameter ratio can increase the upward flow velocity inside the cylinder and promote the formation of granular sludge.

[0029] In the optional schemes of this embodiment, it is more preferred that the ratio of the inner diameter of the inner cylinder 2 to the inner diameter of the outer cylinder 1 is in the range of 0.7 to 0.9. The change in the inner-outer diameter ratio will cause a change in the upward flow velocity inside the inner cylinder 2, as well as a change in the downward flow velocity in the gap between the inner cylinder 2 and the outer cylinder 1. An inner-outer diameter ratio that is too large or too small is not conducive to the circulation flow velocity inside the reactor. The inner-outer diameter ratio range of 0.7-0.9 selected in this scheme can maximize the circulation flow velocity inside the reactor, with the upward flow velocity inside the inner cylinder 2 between 60 and 240 m / h, and the downward flow velocity between the outer cylinder 1 and the inner cylinder 2 between 180 and 360 m / h.

[0030] The following are the relevant settings instructions for the packing assembly: Among the optional solutions in this embodiment, the more preferred one is as follows: Figure 1 As shown, the packing assembly includes a packing frame 4 and packing; the packing frame 4 is fixedly installed inside the inner cylinder 2, and the packing is fixedly installed inside the packing frame 4; the height of the packing assembly is 30% to 60% of the height of the inner cylinder 2.

[0031] Specifically, the packing frame 4 is generally made of metal and has rigid support. The packing is tied inside the packing frame 4 to form a packing assembly. Various styles of packing can be selected, such as braided packing, string sponge packing, or packing balls strung together with rope or wire. The form of packing is not limited, as long as it is conducive to biofilm growth, it can be used.

[0032] The following are the settings instructions for aeration component 5: Among the optional solutions in this embodiment, the more preferred one is as follows: Figure 1 and Figure 2 As shown, the aeration assembly 5 includes an extension pipe 501, an aeration main pipe 502, and multiple aeration branch pipes 503; the extension pipe 501 is fixedly installed inside the inner cylinder 2; the lower end of the extension pipe 501 is connected to the aeration main pipe 502, and each aeration branch pipe 503 is fixedly installed on the aeration main pipe 502 and is connected to the aeration main pipe 502; each aeration branch pipe 503 is provided with an aerator for blowing air into the inner cylinder 2.

[0033] In the optional schemes of this embodiment, it is more preferred that the aeration component 5 is located at a depth of 5m to 8m below the liquid surface inside the outer cylinder 1.

[0034] Specifically, if the aeration component 5 is submerged too deeply, the aeration energy consumption will increase, and if the aeration component 5 is submerged too shallowly, the dissolved oxygen utilization rate will decrease. Since this scheme uses a high aspect ratio reactor with a relatively high height, the aeration component 5 is located in the middle of the reactor to balance the aeration energy consumption and dissolved oxygen utilization rate as much as possible.

[0035] Specifically, the central aeration setup, in situations where space is limited, increases the reactor height, thus solving the problem that the blower cannot aerate when the reactor height exceeds 10m.

[0036] Regarding other related settings: Specifically, the wastewater flow state within the reactor is as follows: the wastewater to be treated is evenly distributed into the reactor from the inlet distributor 3, and is thoroughly mixed with the wastewater flowing back from between the outer cylinder 1 and the inner cylinder 2 due to the air lift circulation. After mixing, the wastewater flows upward within the inner cylinder 2, passing sequentially through the aeration component 5 and the packing component. Some of the wastewater enters the annular sedimentation zone 104 through the outlet annular gap 103, while some wastewater undergoes internal circulation, flowing downward between the inner cylinder 2 and the outer cylinder 1, and mixing with the inlet water. The wastewater entering the annular sedimentation zone 104 through the outlet annular gap 103 undergoes solid-liquid separation within the annular sedimentation zone 104. The solid sludge flows downward through the outlet annular gap 103 into the space between the outer cylinder 1 and the inner cylinder 2, mixes with the downward-flowing wastewater, and then enters the internal circulation. Within the annular sedimentation zone 104, the treated and qualified wastewater continues to flow upward, is collected by the effluent collector 6, and is then discharged.

[0037] Specifically, a specific size of an airlift internal circulation anaerobic ammonia oxidation reactor: the outer cylinder 1 has dimensions of... The outer cylinder 1 has a diameter of 2.8m and a height of 13m, with a height-to-diameter ratio of 4.6. The inner cylinder 2 has a diameter of 2.0m, an inner-outer diameter ratio of 0.7, and a height of 12m. The packing assembly has a height of 6m, and the aeration assembly 5 is 6m away from the inner bottom of the outer cylinder 1. The influent is taken from anaerobic digestate from a kitchen wastewater treatment plant, and the treatment capacity is 35m³. 3 / d, influent ammonia nitrogen ≤1800mg / L, effluent ammonia nitrogen ≤150mg / L, ammonia nitrogen removal rate ≥92%; influent total nitrogen ≤2000mg / L, effluent total nitrogen ≤300mg / L, total nitrogen removal rate ≥85%. Total nitrogen removal load reaches 0.80kgTN / (m³). 3 d).

[0038] This utility model uses specific examples to illustrate its principles and implementation methods. The above description of the embodiments is only for the purpose of helping to understand the method and core idea of ​​this utility model. At the same time, for those skilled in the art, there will be changes in the specific implementation methods and application scope based on the idea of ​​this utility model. In summary, the content of this specification should not be construed as a limitation of this utility model.

Claims

1. An airlift-type internal circulation anaerobic ammonia oxidation reactor, characterized in that: Includes outer cylinder, inner cylinder, packing assembly, and aeration assembly; The outer cylinder is sealed at the bottom and open at the top; an annular sedimentation zone is provided on the upper outer wall of the outer cylinder, and an outlet annular slit is provided on the outer cylinder to communicate with the annular sedimentation zone; the wastewater mixture inside the outer cylinder can enter the annular sedimentation zone through the outlet annular slit, and the settled sludge in the annular sedimentation zone can flow back to the interior of the outer cylinder through the outlet annular slit, and the supernatant in the annular sedimentation zone can be discharged from above the annular sedimentation zone; The inner cylinder is fixedly disposed inside the outer cylinder; there is an annular cavity between the inner cylinder and the outer cylinder; the inner cylinder has an upper opening and a lower opening. In the vertical direction, the upper opening of the inner cylinder is higher than the water outlet annular seam and lower than the upper end of the outer cylinder; the lower opening of the inner cylinder is higher than the inner bottom of the outer cylinder, and the lower opening of the inner cylinder is used to introduce wastewater to be treated upward; The packing assembly is fixedly disposed inside the inner cylinder, and there is a gap between the packing assembly and the lower opening of the inner cylinder; the packing assembly has packing material. The aeration component is fixedly installed at the bottom of the packing material; and the aeration component is capable of providing oxygen.

2. The airlift internal circulation anaerobic ammonia oxidation reactor according to claim 1, characterized in that: A water inlet distributor is fixedly installed inside the outer cylinder; the inlet of the water inlet distributor is used to introduce wastewater to be treated, and the outlet of the water inlet distributor is located directly below the lower opening of the inner cylinder.

3. The airlift-type internal circulation anaerobic ammonia oxidation reactor according to claim 1, characterized in that: The height-to-diameter ratio of the outer cylinder ranges from 3 to 5.

4. The airlift internal circulation anaerobic ammonia oxidation reactor according to claim 1, characterized in that: The ratio of the inner diameter of the inner cylinder to the inner diameter of the outer cylinder is in the range of 0.7 to 0.

9.

5. The airlift internal circulation anaerobic ammonia oxidation reactor according to claim 1, characterized in that: An outer sleeve is fixedly fitted on the upper outer wall of the outer cylinder. The lower end of the outer sleeve is connected to the outer wall of the outer cylinder through a tapered tube. The annular sedimentation zone is formed between the inner side of the tapered tube and the outer wall of the outer cylinder. The water outlet annular seam is located at the lowest point inside the tapered tube.

6. The airlift internal circulation anaerobic ammonia oxidation reactor according to claim 1, characterized in that: The packing assembly includes a packing frame and the packing; the packing frame is fixedly disposed within the inner cylinder, and the packing is fixedly disposed within the packing frame; The height of the packing assembly is 30% to 60% of the height of the inner cylinder.

7. The airlift internal circulation anaerobic ammonia oxidation reactor according to claim 1, characterized in that: The aeration assembly includes an extension pipe, a main aeration pipe, and multiple aeration branch pipes; The extension pipe is fixedly installed inside the inner cylinder; the lower end of the extension pipe is connected to the main aeration pipe, and each of the aeration branch pipes is fixedly installed on the main aeration pipe and is connected to the main aeration pipe. Each of the aeration branch pipes is equipped with an aerator for blowing air into the inner cylinder.

8. The airlift internal circulation anaerobic ammonia oxidation reactor according to claim 1, characterized in that: The aeration component is located at a depth of 5m to 8m below the liquid surface inside the outer cylinder.

9. The airlift internal circulation anaerobic ammonia oxidation reactor according to claim 1, characterized in that: A water collector is also fixedly installed in the annular sedimentation zone; the upper end of the water collector is higher than the opening on the inner cylinder of the inner cylinder body.

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