Sulfur autotrophic nitrogen removal reactor

Abstract

The utility model belongs to the technical field of sewage treatment, and discloses a sulfur autotrophic nitrogen removal reactor which comprises a reactor body for sewage treatment, filler is filled in the reactor body, and the filler contains sulfur element and mineral substances required by reaction and has large specific surface area and strong microorganism loading capacity; the water circulation assembly is communicated with the reactor body and is used for circulating sewage in the reactor, so that the sewage in the reactor is circularly mixed for multiple times through the water circulation assembly, and the reaction is more sufficient and thorough; the backwashing assembly is communicated with the reactor body and is used for carrying out backwashing cleaning on the reactor body; the control assembly is arranged on the reactor body and is used for controlling the automatic operation of the reaction. The device disclosed by the utility model is reasonable in structural design, clear in function of each component, easy to install and maintain, capable of effectively utilizing unique metabolic characteristics of autotrophic microorganisms by accurately controlling processing parameters, and capable of realizing an efficient denitrification effect under the condition that an organic carbon source does not need to be additionally arranged, and has remarkable economic and environmental benefits.

Description

Technical Field

[0001] This utility model relates to the field of wastewater treatment technology, and in particular to a sulfur autotrophic denitrification reactor. Background Technology

[0002] Industrial wastewater from certain industries, such as chemical, pharmaceutical, and food processing, often contains high concentrations of ammonia nitrogen and other organic matter that is difficult to biodegrade. Ammonia nitrogen is one of the common pollutants in wastewater treatment. Traditional nitrification-denitrification processes require a large amount of organic carbon sources to support the growth of heterotrophic bacteria and denitrification.

[0003] Sulfur autotrophic denitrification reactors can utilize inorganic sulfur or hydrogen in wastewater as electron donors to achieve a highly efficient denitrification process without the need for additional organic carbon sources, thereby reducing operating costs and the generation of excess sludge. However, existing sulfur autotrophic denitrification reactors have shortcomings in mixing and stirring, resulting in insufficient contact between wastewater and microorganisms and reduced treatment efficiency. Secondly, existing sulfur autotrophic denitrification reactors suffer from inaccurate sulfur source supply, making it difficult to precisely control the amount of sulfur supplied, leading to unstable reactor operation. Furthermore, existing sulfur autotrophic denitrification reactors lack automation control, lacking real-time monitoring and automated control systems, requiring significant manual intervention during operation, making it difficult to maintain optimal conditions and affecting treatment results. Finally, existing sulfur autotrophic denitrification reactors have shortcomings in modular design, making equipment installation and maintenance complex and difficult to adapt to wastewater treatment needs of different scales.

[0004] Therefore, this application designs a sulfur autotrophic denitrification reactor to solve the above-mentioned technical problems. Utility Model Content

[0005] The purpose of this invention is to provide a sulfur autotrophic denitrification reactor to solve the problems existing in the prior art.

[0006] To achieve the above objectives, this utility model provides the following solution: This utility model provides a sulfur autotrophic denitrification reactor, comprising:

[0007] The reactor body serves as a container for wastewater reaction. The reactor body is filled with packing material containing sulfur and minerals required for the reaction.

[0008] A water circulation component is connected to the reactor body and is used to pump wastewater to be treated into the reactor body, while the wastewater in the reactor body is circulated and mixed through the water circulation component.

[0009] The backwashing assembly is connected to the reactor body and uses clean water and compressed air to blow and wash the packing material to remove the precipitates, dirt and other substances attached to the surface of the packing material, so that the packing material can be reused until all the sulfur elements have been reacted.

[0010] A control component, which is mounted on the reactor body, is used to control the automatic operation of the reaction.

[0011] Preferably, the reactor body includes a tank, which serves as a container for wastewater reaction, and the packing material is filled in the tank; the water circulation assembly is connected to both ends of the side wall of the tank.

[0012] Preferably, a water outlet weir is provided at the top of the inner cavity of the tank. The water outlet weir is installed in the inner cavity of the tank by a fixing rod. The top of the water outlet weir is higher than the connection port between the water circulation component and the upper end of the tank. The water outlet weir is connected to the outside through a water outlet.

[0013] Preferably, the water circulation assembly includes a first water inlet and a second water inlet disposed vertically on the side wall of the tank, a circulation water pipe is disposed between the first water inlet and the second water inlet, and a circulation water pump is disposed on the circulation water pipe.

[0014] Preferably, the water circulation assembly includes an inlet pipe connected to the circulating water pipe, and the inlet pipe is equipped with a delivery pump for pumping in the sewage to be treated.

[0015] Preferably, the filler includes a first filter material, a second filter material, and a third filter material arranged layer by layer from bottom to top in the inner cavity of the tank, wherein the particle size of the first filter material, the second filter material, and the third filter material gradually decreases.

[0016] Preferably, the inner cavity of the tank is provided with a support frame, which divides the inner cavity of the tank into a reaction chamber and a water inlet chamber arranged vertically. The packing is stacked in the reaction chamber on the support frame. The backwashing assembly is connected to the water inlet chamber below the support frame, and the first water inlet is located below the support frame and is connected to the water inlet chamber.

[0017] Preferably, the backwashing assembly includes a backwash water interface communicating with the inner cavity of the tank, the backwash water interface being located below the support frame and communicating with the water inlet cavity.

[0018] Preferably, the backwashing assembly includes a backwashing air port disposed on the tank body, and the backwashing air port is connected to the water inlet chamber through a backwashing air pipe disposed in the tank body.

[0019] Preferably, the top of the outlet weir is provided with a serrated inlet edge.

[0020] Compared with the prior art, this utility model has the following advantages and technical effects: This utility model discloses a sulfur autotrophic denitrification reactor. The reactor body, as the core unit of wastewater treatment, is carefully filled with high-efficiency packing material to meet the sulfur, minerals and autotrophic microbial community required for the reaction, ensuring the continuous progress of the reaction and guaranteeing its stability and efficiency. Through the exquisite synergy between microorganisms and sulfur, an excellent sulfur autotrophic denitrification process is achieved, effectively reducing nitrogen pollutants in wastewater and significantly improving water quality. The reactor body is closely connected to the water circulation component, which is not only responsible for accurately pumping the wastewater to be treated into the reactor, but also achieves full mixing of wastewater inside the reactor through its powerful circulation function, significantly improving reaction efficiency and uniformity. Meanwhile, the water circulation component effectively prevents sludge deposition, ensuring uniform and stable flow within the reactor. This allows all treatment zones to receive sufficient reaction and processing. Under anoxic conditions, this design further helps prevent the formation of localized anaerobic conditions, providing a strong guarantee for the smooth progress of the autotrophic denitrification process. The backwashing component is seamlessly connected to the reactor body. Through regular backwashing operations, it can thoroughly remove blockages and dirt accumulation inside the reactor, effectively extending the service life of the packing material and ensuring the reactor's continuous and efficient operation. The reactor body also integrates advanced control components, achieving comprehensive automated control of the reaction process. This not only significantly reduces the need for manual intervention but also significantly improves the ease of operation and the stability of the reaction. During normal operation of the reactor, the water circulation component starts working, introducing wastewater into the reactor. After the wastewater comes into contact with the microorganisms and sulfur in the packing material, a highly efficient denitrification reaction is immediately initiated. When the water volume in the reactor reaches the preset standard, the water circulation component continues to operate, ensuring that the wastewater and packing material are in full contact. The microorganisms fully utilize the sulfur to carry out autotrophic denitrification, converting nitrogen pollutants into harmless substances, and then the treated clean water is discharged. As the reaction continues, the control component will activate the backwashing component in a timely manner according to the preset program to thoroughly clean the reactor, restore the reactivity of the packing material, and provide a solid guarantee for the long-term stable operation of the equipment.

[0021] This utility model has a reasonable structural design, with each component having a clearly defined function, making it easy to install and maintain. By precisely controlling the processing parameters, it can effectively utilize the unique metabolic characteristics of autotrophic microorganisms to achieve efficient denitrification without the need for an external organic carbon source, resulting in significant economic and environmental benefits. Attached Figure Description

[0022] The accompanying drawings, which form part of this application, are used to provide a further understanding of this application. The illustrative embodiments and descriptions of this application are used to explain this application and do not constitute an undue limitation of this application. In the drawings:

[0023] Figure 1 This is a schematic diagram of the structure of the sulfur autotrophic denitrification reactor of this utility model;

[0024] Figure 2 This is a schematic diagram of the control component of this utility model;

[0025] In the diagram: 1. Reactor body; 2. Water circulation assembly; 3. Backwash assembly; 4. Control assembly; 11. Tank; 12. Packing material; 13. Outlet weir; 14. Outlet; 15. Support frame; 16. Manhole; 121. First filter media; 122. Second filter media; 123. Third filter media; 131. Fixing rod; 132. Inlet side; 151. Inlet chamber; 152. Reaction chamber; 21. First inlet; 22. Second inlet; 23. Circulating water pipe; 24. Circulating water pump; 25. Inlet pipe; 26. Transfer pump; 27. First check valve; 28. Second check valve; 29. ​​Flow meter; 31. Backwash water interface; 32. Backwash air interface; 33. Backwash air pipe; 34. Air distribution connection pipe; 35. Air distribution pipe; 41. Control module; 42. Power supply module; 43. Display module; 44. Input module; 45. Sensor. Detailed Implementation

[0026] 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.

[0027] 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.

[0028] Reference Figures 1-2 As shown, this embodiment provides a sulfur autotrophic denitrification reactor, comprising:

[0029] The reactor body 1 serves as a container for wastewater reaction. The reactor body 1 is filled with packing material 12, which contains sulfur and minerals required for the reaction.

[0030] Water circulation component 2 is connected to reactor body 1 and is used to pump wastewater to be treated into reactor body 1. At the same time, the wastewater in reactor body 1 is circulated and mixed through water circulation component 2.

[0031] Backwashing component 3 is connected to reactor body 1. It uses clean water and compressed air to blow and wash the packing 12, cleaning the precipitates and dirt attached to the surface of the packing 12, so that the packing 12 can be reused until all the sulfur elements are reacted.

[0032] Control component 4 is installed on reactor body 1 and is used to control the automatic operation of the reaction.

[0033] This utility model discloses a sulfur autotrophic denitrification reactor. The reactor body 1, as the core unit of wastewater treatment, is meticulously filled with high-efficiency packing material 12 to meet the requirements of sulfur minerals and autotrophic microbial communities for the reaction, ensuring continuous reaction and guaranteeing its stability and efficiency. Through the exquisite synergy between microorganisms and sulfur, a superior sulfur autotrophic denitrification process is achieved, effectively reducing nitrogen pollutants in wastewater and significantly improving water quality. The reactor body 1 is closely connected to the water circulation component 2, which not only accurately pumps the wastewater to be treated into the reactor but also achieves thorough mixing of the wastewater inside the reactor through its powerful circulation function, significantly improving reaction efficiency and uniformity. Simultaneously, the water circulation component 2 can also effectively prevent... The design prevents sludge deposition, ensuring uniform and stable flow within the reactor. This allows all treatment zones to fully react and process the material. Under anoxic conditions, this design further helps prevent the formation of localized anaerobic conditions, providing a strong guarantee for the smooth progress of the autotrophic denitrification process. The backwashing component 3 is seamlessly connected to the reactor body 1. Through regular backwashing operations, it can thoroughly remove blockages and dirt accumulation inside the reactor, effectively extending the service life of the packing material 12 and ensuring the continuous and efficient operation of the reactor. The reactor body 1 also integrates an advanced control component 4, realizing comprehensive automated control of the reaction process. This not only significantly reduces the need for manual intervention but also significantly improves the convenience of operation and the stability of the reaction. During normal operation of the reactor, the water circulation component 2 begins to work, introducing wastewater into the reactor. Upon contact with the microorganisms and sulfur in the packing material 12, the wastewater immediately initiates a highly efficient denitrification reaction. Once the water volume in the reactor reaches a preset standard, the water circulation component 2 continues to operate, ensuring sufficient contact between the wastewater and the packing material 12. The microorganisms fully utilize the sulfur for autotrophic denitrification, converting nitrogen pollutants into harmless substances, and then the treated water is discharged. As the reaction continues, the control component 4 will activate the backwashing component 3 according to a preset program to thoroughly clean the reactor, restoring the reactivity of the packing material 12 and providing a solid guarantee for the long-term stable operation of the equipment. This utility model has a reasonable structural design, clearly defined functions for each component, and is easy to install and maintain. By precisely controlling the treatment parameters, it can effectively utilize the unique metabolic characteristics of autotrophic microorganisms to achieve highly efficient denitrification without the need for an external organic carbon source, resulting in significant economic and environmental benefits.

[0034] Further optimization of the design involves a reactor body 1 comprising a tank 11, which serves as the container for wastewater reaction, with packing material 12 filling the tank 11. A water circulation assembly 2 is connected to both ends of the side wall of the tank 11. The tank 11, acting as the reaction vessel for wastewater treatment, is filled with packing material 12. The water circulation assembly 2 cleverly utilizes the water inlets at both ends of the side wall of the tank 11 to achieve wastewater circulation and mixing, ensuring uniform distribution of wastewater within the tank 11, improving reaction efficiency, and effectively preventing sludge deposition, thus maintaining a clean and efficient reaction environment.

[0035] In one embodiment of this application, a manhole 16 is provided on the side wall of the tank 11 to facilitate internal inspection and maintenance.

[0036] Further optimizing the design, a water outlet weir 13 is installed at the top of the inner cavity of the tank 11. The water outlet weir 13 is installed in the inner cavity of the tank 11 by a fixing rod 131. The top of the water outlet weir 13 is higher than the upper connection port between the water circulation component 2 and the tank 11. The water outlet weir 13 is connected to the outside through the water outlet 14. The water outlet weir 13 is installed in the inner cavity of the tank 11 by a sturdy fixing rod, and its top is designed to be higher than the connection port between the circulation component and the tank 11, ensuring that the treated wastewater flows into the water outlet weir 13 in a stable and uniform manner and is smoothly discharged through the water outlet 14, avoiding wastewater overflow and local water accumulation problems, and improving the quality of the effluent.

[0037] Further optimizing the design, the water circulation component 2 includes a first water inlet 21 and a second water inlet 22, which are correspondingly arranged on the side wall of the tank 11. A circulation water pipe 23 is installed between the first water inlet 21 and the second water inlet 22, and a circulation water pump 24 is installed on the circulation water pipe 23. The first water inlet 21 and the second water inlet 22 are tightly connected by the circulation water pipe 23, and the circulation water pipe 23 is equipped with a high-efficiency circulation water pump 24, which provides strong power for wastewater circulation, ensuring continuous and uniform mixing of wastewater inside the reactor, further improving reaction efficiency and uniformity, and laying a solid foundation for efficient reaction.

[0038] Further optimizing the design, the water circulation component 2 includes an inlet pipe 25 connected to the circulating water pipe 23, and a transfer pump 26 for pumping in the wastewater to be treated is installed on the inlet pipe 25. The inlet pipe 25 is cleverly connected to the circulating water pipe 23, and the transfer pump 26 stably delivers the wastewater to be treated into the reactor body 1, providing a continuous source of raw materials for the denitrification reaction and ensuring the continuity and stability of the reaction process.

[0039] In one embodiment of this application, a first check valve 27 is provided on the circulating water pipe 23. The first check valve 27 is located between the first water inlet 21 and the circulating water pump 24. The first check valve 27 opens unidirectionally to the first water inlet 21 to prevent the circulating sewage from flowing back.

[0040] In one embodiment of this application, a second check valve 28 is provided on the inlet pipe 25. The second check valve 28 is located between the delivery pump 26 and the circulating water pipe 23. The second check valve 28 opens unidirectionally to the circulating water pipe 23 to prevent sewage backflow in the circulation and further ensure the stable operation of the system.

[0041] In one embodiment of this application, a flow meter 29 is installed on the inlet pipe 25, which can accurately monitor and control the content of sewage pumped into the tank 11, providing strong support for precise regulation of the reaction process.

[0042] Further optimization of the design involves the packing material 12 comprising a first filter media 121, a second filter media 122, and a third filter media 123 arranged layer by layer from bottom to top within the inner cavity of the tank 11. The particle size of the first filter media 121, the second filter media 122, and the third filter media 123 gradually decreases. This layered arrangement of the packing material 12, with the particle size gradually decreasing from bottom to top, facilitates the step-by-step filtration of wastewater and the attachment and growth of microorganisms, significantly improving the filtration efficiency and microbial attachment area of ​​the packing material 12, thus creating favorable conditions for the denitrification reaction.

[0043] In one embodiment of this application, the first filter media 121 is a porous filter brick, the second filter media 122 is a pebble, and the third filter media 123 is a special sulfur autotrophic filter media with gradually decreasing particle size, providing a rich surface for microorganisms to attach and grow, while ensuring uniform distribution of influent water, so that the water flow can fully contact the packing 12 and microorganisms, thereby improving treatment efficiency.

[0044] In one embodiment of this application, the packing material 12 provides a stable growth environment for microorganisms, supporting the effective attachment of autotrophic denitrifying bacteria and their reaction with nitrates in the wastewater. Simultaneously, it ensures sufficient contact between the wastewater and the microorganisms, further improving treatment efficiency. The microorganisms can be generated spontaneously or artificially inoculated as needed, flexibly meeting usage requirements.

[0045] In one embodiment of this application, the microorganisms can be generated spontaneously or artificially inoculated as needed, flexibly meeting the usage requirements.

[0046] In one embodiment of this application, the filler 12 contains solid elemental sulfur or other forms of sulfur compounds, which are oxidized as electron donors during the reaction and gradually converted into sulfate ions (SO4). 2- At the same time, nitrate NO 3- As an electron acceptor, it is reduced to nitrogen gas (N2). This process is carried out by autotrophic denitrifying bacteria, which use the nitrate respiration pathway for energy metabolism to achieve efficient nitrogen removal.

[0047] In one embodiment of this application, the above reaction formula includes:

[0048]

[0049] In one embodiment of this application, sulfur or its compounds include elemental sulfur (S), hydrogen sulfide (H₂S), and sulfite (SO₃). 2- These compounds play a crucial role in the reaction.

[0050] In a further optimized design, a support frame 15 is installed inside the tank 11, dividing the tank 11 into a reaction chamber 152 and a water inlet chamber 151 arranged vertically. The packing material 12 is stacked in the reaction chamber 152 on the support frame 15. The backwashing assembly 3 is connected to the water inlet chamber 151 below the support frame 15, and the first water inlet 21 is located below the support frame 15 and connected to the water inlet chamber 151. Support rods securely fix the support frame 15 to the tank 11, rationally dividing the internal space of the tank 11 into two areas: the reaction chamber 152 and the water inlet chamber 151. The packing material 12 is stacked in the reaction chamber 152, while the backwashing assembly 3 is connected to the water inlet chamber 151 for periodic cleaning of the packing material 12, extending its service life.

[0051] Further optimizing the design, the backwashing assembly 3 includes a backwash water interface 31 communicating with the inner cavity of the tank 11. The backwash water interface 31 is located below the support frame 15 and communicates with the inlet chamber 151. The backwashing assembly 3 also includes a backwash air interface 32 mounted on the tank 11, which communicates with the inlet chamber 151 via a backwash air pipe 33 located inside the tank 11. The backwash water interface 31, located below the support frame 15 and connected to the inlet chamber 151, ensures that backwash water can enter the inlet chamber 151 evenly, thoroughly cleaning the packing material 12. Simultaneously, the backwash air interface 32, connected to the inlet chamber 151 via the backwash air pipe 33, injects compressed air to enhance the backwashing effect. The combined action of the backwash water and compressed air effectively breaks down the sludge adhering to the support frame 15, making it easier to remove dirt and impurities from the surface of the packing material 12.

[0052] In one embodiment of this application, the backwash air pipe 33 passes through and is fixedly connected to the outlet weir 13, which not only improves the stability of the outlet weir 13, but also serves to connect the gas.

[0053] In one embodiment of this application, the backwash air pipe 33 is connected to a plurality of air distribution connecting pipes 34, so that the compressed air for backwashing can be evenly distributed within the range of the support frame 15. The end of the air distribution connecting pipe 34 is connected to an air distribution pipe 35, and the compressed air is discharged through the small hole on the air distribution pipe 35, thereby expanding the air outlet range of the compressed air and improving the backwashing effect.

[0054] Further optimizing the design, a serrated inlet edge 132 is provided at the top of the outlet weir 13. The serrated inlet edge design at the top of the outlet weir 13 not only improves drainage efficiency and ensures that the treated wastewater can be discharged from the reaction zone smoothly and evenly, but also effectively intercepts solids in the wastewater, preventing them from accumulating in the outlet weir 13, thereby improving the quality of the effluent.

[0055] In one embodiment of this application, the control component 4 integrates a control module 41, a power supply module 42, a display module 43, an input module 44, and multiple sensors 45 to achieve real-time monitoring and precise control of the entire reaction process. Through automated control, manual intervention is reduced, and operating efficiency and reliability are improved.

[0056] In one embodiment of this application, the control module 41 adopts an advanced PLC control system, which automatically controls the operation of each subsystem through a programmable logic controller to ensure the efficient and stable operation of the system.

[0057] In one embodiment of this application, the display module 43 adopts a display screen with touch screen control function, which can not only display the operating parameters of the device in real time, but also conveniently control the operation of the device through the touch screen function, thereby improving the ease of operation.

[0058] In one embodiment of this application, the input module 44 adopts the form of buttons and physical keyboards to provide comprehensive input control command functions, ensuring that operators can input control commands flexibly and accurately.

[0059] In one embodiment of this application, multiple sensors 45 are carefully arranged inside and outside the tank 11 to monitor water quality parameters in real time, including key information such as nitrate, pH value, temperature, flow rate, and total nitrogen, providing accurate data feedback for the automatic operation of the equipment and ensuring that the reaction process is always in the best state.

[0060] In the description of this utility model, it should be understood that the terms "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0061] The embodiments described above are merely preferred embodiments of the present utility model and are not intended to limit the scope of the present utility model. Various modifications and improvements made to the technical solutions of the present utility model by those skilled in the art without departing from the spirit of the present utility model should fall within the protection scope defined by the claims of the present utility model.

Claims

1. A sulfur autotrophic denitrification reactor characterized by, include: The reactor body (1) serves as a container for wastewater reaction. The reactor body (1) is filled with packing material (12), which contains sulfur and minerals required for the reaction. Water circulation component (2), which is connected to the reactor body (1), is used to pump the wastewater to be treated into the reactor body (1), and at the same time the wastewater in the reactor body (1) is circulated and mixed through the water circulation component (2); Backwashing assembly (3), which is connected to the reactor body (1), uses clean water and compressed air to blow and wash the packing (12) to clean the precipitates and dirt attached to the surface of the packing (12), so that the packing (12) can be reused until all the sulfur elements are reacted. Control component (4), which is disposed on the reactor body (1), is used to control the automatic operation of the reaction.

2. The sulphur autotrophic denitrification reactor according to claim 1, characterized in that: The reactor body (1) includes a tank (11), which serves as a container for wastewater reaction, and the packing material (12) is filled inside the tank (11); the water circulation component (2) is connected to both ends of the side wall of the tank (11).

3. The sulphur autotrophic denitrification reactor according to claim 2, characterized in that: The top of the inner cavity of the tank (11) is provided with a water outlet weir (13). The water outlet weir (13) is installed in the inner cavity of the tank (11) by a fixing rod (131). The top of the water outlet weir (13) is higher than the upper connection port between the water circulation component (2) and the tank (11). The water outlet weir (13) is connected to the outside through the water outlet (14).

4. The sulfur autotrophic denitrification reactor of claim 2, wherein: The water circulation component (2) includes a first water inlet (21) and a second water inlet (22) disposed on the side wall of the tank (11) respectively. A circulation water pipe (23) is provided between the first water inlet (21) and the second water inlet (22), and a circulation water pump (24) is provided on the circulation water pipe (23).

5. The sulphur autotrophic denitrification reactor according to claim 4, characterized in that: The water circulation component (2) includes an inlet pipe (25) connected to the circulating water pipe (23), and a transfer pump (26) for pumping in the sewage to be treated is provided on the inlet pipe (25).

6. The sulfur autotrophic denitrification reactor of claim 2, wherein: The filler (12) includes a first filter material (121), a second filter material (122) and a third filter material (123) arranged layer by layer from bottom to top in the inner cavity of the tank (11), and the particle size of the first filter material (121), the second filter material (122) and the third filter material (123) gradually decreases.

7. The sulfur autotrophic denitrification reactor of claim 4, wherein: The inner cavity of the tank (11) is provided with a support frame (15), which divides the inner cavity of the tank (11) into a reaction chamber (152) and a water inlet chamber (151) arranged vertically. The packing material (12) is stacked in the reaction chamber (152) on the support frame (15). The backwashing assembly (3) is connected to the water inlet chamber (151) below the support frame (15). The first water inlet (21) is located below the support frame (15) and is connected to the water inlet chamber (151).

8. The sulphur autotrophic denitrification reactor according to claim 7, characterized in that: The backwashing assembly (3) comprises a backwashing water interface (31) in communication with the inner cavity of the tank body (11), and the backwashing water interface (31) is located below the support frame (15) and in communication with the water inlet cavity (151).

9. The sulphur autotrophic denitrification reactor according to claim 8, characterized in that: The backwashing assembly (3) comprises a backwashing gas interface (32) arranged on the tank body (11), and the backwashing gas interface (32) is in communication with the water inlet cavity (151) through a backwashing gas pipe (33) arranged in the tank body (11).

10. The sulfur autotrophic denitrification reactor of claim 3, wherein: The top end of the water outlet weir (13) is provided with a sawtooth-shaped water inlet edge (132).

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