Rotational flow fluidization deep denitrification device and process thereof

Abstract

The invention relates to the technical field of sewage denitrification, in particular to a rotational flow fluidization deep denitrification device and a process thereof, the rotational flow fluidization deep denitrification device comprises a main reaction drum, a first water inlet pipe, a second water inlet pipe and a three-phase separation structure; a sulfur autotrophic filler is arranged in the main reaction drum; the first water inlet pipe and the second water inlet pipe are arranged at the lower end of the main reaction drum and used for communicating the inside and the outside of the main reaction drum, the first water inlet pipe and the second water inlet pipe are arranged at intervals in the circumferential direction of the main reaction drum, and the axes of the first water inlet pipe and the second water inlet pipe are arranged in parallel; the second water inlet pipe is used for inputting clear water into the main reaction drum; the three-phase separation structure is arranged in the main reaction barrel and is used for separating sulfur autotrophic filler, water and gas. When the rotational flow fluidization deep denitrification device is used, blockage is avoided, the denitrification efficiency is improved, the occupied area is reduced, and the stability is higher.

Description

Technical Field

[0001] The invention relates to the technical field of sewage denitrification, and in particular to a cyclone fluidization deep denitrification device and a process thereof. Background Art

[0002] With the progress and development of human society, water pollution has become more and more serious. Excessive nitrogen discharged into water bodies through people's production and living water will cause various water pollution problems such as eutrophication. Therefore, deep denitrification of sewage is a key point in the treatment of various sewage. With the increasing requirements for urban water environment quality and the increasingly stringent requirements for total nitrogen emissions, there are also higher requirements for the efficiency and stability of sewage denitrification technology.

[0003] Sulfur autotrophic denitrification was proposed and studied in the 1970s. The discovery of autotrophic denitrifying bacteria, especially denitrifying Thiobacillus, has attracted widespread attention. Sulfur autotrophic denitrification technology refers to the use of active sulfur and reduced sulfur compounds as electron donors, utilizing the reducing property of the sulfur element to catalyze the denitrification of autotrophic denitrifying bacteria, without the need for an external carbon source and without producing harmful substances. The core of the simultaneous denitrification of sulfur autotrophic denitrification reaction is its functional flora, namely, denitrifying and desulfurizing bacteria. Therefore, when applying sulfur autotrophic denitrification denitrification technology, it is necessary to fully consider the importance of ensuring high-efficiency and high-activity functional flora in the development of sulfur autotrophic denitrification denitrification technology.

[0004] In recent years, sulfur autotrophic denitrification has been widely used for its economy and safety. The research on sulfur autotrophic denitrification is mainly from the aspects of reaction mechanism, reaction device design, operation conditions and optimal operation control mode. Studies have shown that to a certain extent, the sulfur autotrophic denitrification process with reducing metal sulfide as electron donor has better denitrification effect. In addition, the form of the reaction device will also have a great impact on the reaction efficiency. For example, the upward flow water inlet method makes it easy for the gas produced during the denitrification reaction to escape, and it helps to form an anaerobic environment, which is conducive to the denitrification reaction; the microenvironment of the biological reaction constructed by the internal filler of the reaction device will also affect the effect of the sulfur autotrophic denitrification reaction.

[0005] The autotrophic denitrification process of the sulfur autotrophic denitrification device is that water enters from the bottom of the device and passes through the coarse sand layer, deoxygenation layer, and denitrification layer arranged in the device in turn. The reduced sulfur is used as an electron donor, and the energy is provided by oxidizing the reduced sulfur. At the same time, nitrate is used as an electron acceptor to reduce nitrate to nitrogen. The traditional fixed bed filler of the sulfur autotrophic denitrification device contains sulfur but has some shortcomings: 1. The gaps between the fixed bed packings of the sulfur autotrophic denitrification device are small, which will cause the device to be blocked. If it is not cleaned in time, it is easy to cause hardening and lead to device failure; 2. The contact between the filler and the sewage in the fixed bed is not sufficient, so a longer retention time is usually required, which not only increases the floor space, but also reduces the efficiency of sulfur autotrophic denitrification; 3. Fixed bed has high requirements for influent water due to its easy clogging problem. It is often necessary to control the concentration of suspended solids in the influent water, and the influent water quality needs to reach SS < 10mg / L; 4. The fixed bed needs to be regularly air-washed and backwashed, but the entry of air will destroy the living environment of the internal bacteria of the device in an anoxic state, thereby affecting the activity of the sulfur autotrophic denitrifying bacteria. Summary of the invention

[0006] The present invention provides a cyclone fluidized deep denitrification device and a process thereof, so as to solve the technical problems in the prior art such as easy blockage of the fixed bed and low denitrification efficiency.

[0007] In order to solve the above problems, the present invention provides a cyclone fluidized deep denitrification device adopting the following technical solutions: A cyclone fluidization deep denitrification device comprises a main reaction barrel, a first water inlet pipe, a second water inlet pipe and a three-phase separation structure; a sulfur autotrophic filler is arranged in the main reaction barrel; the first water inlet pipe and the second water inlet pipe are arranged at the lower end of the main reaction barrel and are used to connect the inside and outside of the main reaction barrel, the first water inlet pipe and the second water inlet pipe are arranged at intervals along the circumferential direction of the main reaction barrel, and the axes of the first water inlet pipe and the second water inlet pipe are arranged in parallel, the end of the first water inlet pipe away from the main reaction barrel is connected to a sewage tank, the second water inlet pipe is used to input clean water into the main reaction barrel, the water flow rate input into the main reaction barrel by the first water inlet pipe and the second water inlet pipe is the same and both input water in a tangential direction; the three-phase separation structure is arranged in the main reaction barrel, and is used to separate the sulfur autotrophic filler, water and gas.

[0008] The beneficial effect is that when the cyclone fluidized deep denitrification device of the present invention is in use, by controlling the first water inlet pipe and the second water inlet pipe to inlet water tangentially along the same arc direction and the water flow rate input into the main reaction barrel to be the same, a cyclone is formed and maintained in the fluidized area of ​​the main reaction barrel to form a fluidized bed. In an oxygen-deficient environment, autotrophic denitrifying bacteria use reduced sulfur as an electron donor and nitrate in reduced sewage as an electron acceptor to generate nitrogen through a denitrification reaction. After the sewage denitrification process is completed, the sulfur autotrophic filler, the treated sewage and the nitrogen are separated through a three-phase separator to achieve efficient denitrification. When the cyclone fluidized deep denitrification device of the present invention is in use, the cyclone can not only fully mix the sulfur autotrophic filler and the sewage in the main reaction barrel, but also provide upward hydraulic force to enlarge the gap between the sulfur autotrophic filler until the sulfur autotrophic filler can move freely in the fluidized area without contacting each other, so that the main reaction barrel is not easily blocked, and the situation of compaction or even failure is greatly avoided; at the same time, the mixing of sewage and the sulfur autotrophic filler is also promoted, so that the contact area between the autotrophic denitrifying bacteria on the surface of the sulfur autotrophic filler and the sewage is wider, thereby improving the denitrification efficiency, reducing the reaction residence time, and reducing the floor space of the device; increasing the contact area between the sulfur autotrophic filler and the sewage to achieve efficient denitrification; the larger specific surface area on the sulfur autotrophic filler provides a larger living space for the autotrophic denitrifying bacteria, and the unit concentration of the denitrifying bacteria is higher, so that the denitrification device has a higher impact load resistance and higher operation stability.

[0009] Furthermore, the three-phase separation structure includes a first baffle, a second baffle, and an air collecting hood. The first baffle is an annular plate and is arranged on the inner wall of the main reaction barrel. The first baffle has a guide surface arranged in a V shape. The tip of the V-shaped guide surface is arranged toward the axial direction of the main reaction barrel to guide water and block the sulfur autotrophic filler. The air collecting hood is arranged above the first baffle and an exhaust pipe is connected in the middle of the air collecting hood. The exhaust pipe is used to discharge nitrogen from the main reaction barrel. The second baffle is an annular plate and is arranged on the inner wall of the main reaction barrel. The second baffle is arranged from the outside to the inside and tilted downward along the radial direction of the main reaction barrel.

[0010] Beneficial effects: simple structure, easy to install and maintain.

[0011] Furthermore, the cross-section of the first baffle is an equilateral triangle, and one side of the equilateral triangle coincides with the inner wall of the main reaction barrel.

[0012] Beneficial effects: simple structure and easy to manufacture.

[0013] Furthermore, the innermost end of the second baffle is located inside the outermost end of the air collecting hood, and the lowermost end of the second baffle is located above the lowermost end of the air collecting hood.

[0014] Furthermore, the three-phase separation structure also includes a water outlet weir, which is an annular groove arranged in the main reaction barrel with the groove facing upward. The water outlet weir is above the gas collecting hood, and a water outlet is provided on the side wall corresponding to the main reaction barrel to discharge the water in the water outlet weir.

[0015] Beneficial effect: It is convenient to discharge the water in the water outlet weir at a stable and uniform speed, ensuring the stability of the main reaction barrel.

[0016] Furthermore, a water outlet pipe is provided on the main reaction barrel, and the water outlet pipe is connected to the second water inlet pipe to circulate the water separated by the three-phase separation structure in the main reaction barrel back to the main reaction barrel.

[0017] Beneficial effects: Recycle clean water, improve water resource utilization, protect water resources, green the environment, and reduce costs.

[0018] Furthermore, the first water inlet pipe and the second water inlet pipe are both provided with a driving pump for controlling the flow rate.

[0019] Beneficial effects: simple structure and easy control.

[0020] In order to solve the above problems, the present invention provides a cyclone fluidized deep denitrification process adopting the following technical solutions: A cyclone fluidized deep denitrification process uses the above-mentioned cyclone fluidized deep denitrification device, comprising the following steps: S1. First, a set amount of sulfur autotrophic filler and clean water are placed in the main reaction barrel; S2, sewage enters the main reaction barrel along the first water inlet pipe, and clean water enters the main reaction barrel along the second water inlet pipe. The sewage and clean water have the same flow rate and enter in the tangential direction to generate a vortex in the main reaction barrel. The vortex makes the sewage fully contact with the sulfur autotrophic filler in the device and forms a fluidized bed; S3. After denitrification is completed, the sulfur autotrophic filler, nitrogen and denitrified wastewater are separated through the three-phase separation structure set on the top of the main reaction barrel.

[0021] Beneficial effects: When the cyclone fluidized deep denitrification process of the present invention is used, the cyclone can not only fully mix the sulfur autotrophic filler and the sewage in the main reaction barrel, but also provide upward hydraulic force to enlarge the gap between the sulfur autotrophic filler until the sulfur autotrophic filler can move freely in the fluidized zone without contacting each other, so that it is not easy to be blocked in the main reaction barrel, which greatly avoids the situation of compaction and even failure; at the same time, it also promotes the mixing of sewage and sulfur autotrophic filler, so that the contact area between the autotrophic denitrifying bacteria on the surface of the sulfur autotrophic filler and the sewage is wider, thereby improving the denitrification efficiency, reducing the reaction residence time, and reducing the footprint of the device; increasing the contact area between the sulfur autotrophic filler and the sewage to achieve efficient denitrification; the larger specific surface area on the sulfur autotrophic filler provides a larger living space for the autotrophic denitrifying bacteria, and the unit concentration of the denitrifying bacteria is higher, so that the denitrification device has a higher impact load resistance and higher operation stability.

[0022] Furthermore, the swirl increases the upward water flow velocity in the fluidized bed as the main reaction drum to a state where the sulfur autotrophic fillers move freely in the bed without contacting each other.

[0023] Beneficial effect: It makes the main reaction barrel less likely to be blocked, thus greatly avoiding the situation of hardening and even failure.

[0024] Furthermore, the flow rate of sewage and clean water is not less than 2m / h.

[0025] Beneficial effect: Ensure denitrification efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] By reading the following detailed description with reference to the accompanying drawings, the above and other objects, features and advantages of the exemplary embodiments of the present invention will become readily understood. In the accompanying drawings, several embodiments of the present invention are shown in an exemplary and non-limiting manner, and the same or corresponding reference numerals represent the same or corresponding parts, wherein: Figure 1 It is a structural schematic diagram of a cyclone fluidized deep denitrification device of the present invention; Figure 2 The figure is a schematic diagram of a cyclone flow of a cyclone fluidized deep denitrification process of the present invention.

[0027] Description of reference numerals: 1. Main reaction drum; 2. First water inlet pipe; 3. Second water inlet pipe; 4. First baffle; 5. Second baffle; 6. Gas collecting hood; 7. Exhaust pipe; 8. Water outlet weir; 9. Water outlet pipe; 10. First driving pump; 11. Second driving pump; 12. Sewage tank; 13. Sulfur autotrophic filler. DETAILED DESCRIPTION

[0028] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Those skilled in the art should know that the embodiments described below are part of the embodiments of the present disclosure, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present invention.

[0029] By controlling the first water inlet pipe and the second water inlet pipe to feed water tangentially along the same arc direction and to have the same water flow rate into the main reaction barrel, a vortex is formed and maintained in the fluidized zone of the main reaction barrel to form a fluidized bed.

[0030] After introducing the basic principle of the present invention, various non-limiting embodiments of the present invention are described in detail below. The number of any element in the drawings is for illustration and not for limitation, and any naming is only for distinction and does not have any limiting meaning.

[0031] The principle and spirit of the present invention are explained in detail below with reference to several representative embodiments of the present invention.

[0032] Embodiment 1 of a cyclone fluidization deep denitrification device provided by the present invention: like Figure 1 and Figure 2 As shown, a cyclone fluidized deep denitrification device of the present invention comprises a main reaction barrel 1 and a three-phase separation structure.

[0033] A sulfur autotrophic filler 13 is provided in the main reaction barrel 1. A first water inlet pipe 2 and a second water inlet pipe 3 are provided at the lower end of the main reaction barrel 1 for connecting the inside and the outside of the main reaction barrel 1. The first water inlet pipe 2 and the second water inlet pipe 3 are arranged at intervals along the circumferential direction of the main reaction barrel 1, and the axes of the first water inlet pipe 2 and the second water inlet pipe 3 are arranged in parallel. The end of the first water inlet pipe 2 away from the main reaction barrel 1 is connected to a sewage tank 12, and the second water inlet pipe 3 is used to input clean water into the main reaction barrel 1. The water flow rate input into the main reaction barrel 1 by the first water inlet pipe 2 and the second water inlet pipe 3 is the same.

[0034] The first water inlet pipe 2 is provided with a first driving pump 10 , and the second water inlet pipe 3 is provided with a second driving pump 11 . The first driving pump 10 and the second driving pump 11 are used to control the flow rates of water input into the main reaction barrel 1 through the first water inlet pipe 2 and the second water inlet pipe 3 to be the same.

[0035] The three-phase separation structure includes a first baffle 4 , a second baffle 5 , an air collecting hood 6 and a water outlet weir 8 .

[0036] The first baffle plate 4 is an annular plate and is arranged on the inner side wall of the main reaction barrel 1. The first baffle plate has a guide surface arranged in a V shape, and the tip of the V-shaped guide surface is arranged toward the axis direction of the main reaction barrel to guide water and block the sulfur autotrophic filler. In this embodiment, the cross section of the first baffle plate 4 is an equilateral triangle and one side thereof coincides with the inner wall of the main reaction barrel 1.

[0037] The gas collecting hood 6 is arranged above the first baffle 4 and fixed on the top wall of the main reaction barrel 1 . An exhaust pipe 7 is connected in the middle of the gas collecting hood 6 . The exhaust pipe 7 extends upward to the outside of the main reaction barrel 1 to discharge nitrogen from the main reaction barrel 1 .

[0038] The second baffle plate 5 is an annular plate and is arranged on the inner wall of the main reaction barrel 1. The second baffle plate 5 is arranged from the outside to the inside and tilted downward along the radial direction of the main reaction barrel 1. The innermost end of the second baffle plate 5 is located on the inner side of the outermost end of the gas collecting hood 6, and the lowermost end of the second baffle plate 5 is located above the lowermost end of the gas collecting hood 6.

[0039] The water outlet weir 8 is an annular groove arranged in the main reaction barrel 1 with the groove facing upward. The water outlet weir 8 is above the gas collecting hood 6. A water outlet is opened at the side wall of the main reaction barrel 1 corresponding to the water outlet weir 8 to discharge the water in the water outlet weir 8.

[0040] The main reaction barrel 1 is also provided with a water outlet pipe 9 , which is connected to the second water inlet pipe 3 so as to circulate the water separated by the three-phase separation structure in the main reaction barrel 1 back into the main reaction barrel 1 .

[0041] When in use, the cyclone fluidized deep denitrification device of the present invention controls the first water inlet pipe 2 and the second water inlet pipe 3 to enter water tangentially along the same arc direction and to have the same water flow rate into the main reaction barrel 1, thereby forming and maintaining a cyclone in the fluidized zone of the main reaction barrel 1 to form a fluidized bed. In an oxygen-deficient environment, autotrophic denitrifying bacteria use reduced sulfur as an electron donor and nitrate in reduced sewage as an electron acceptor to generate nitrogen through a denitrification reaction. After the sewage denitrification process is completed, the sulfur autotrophic filler 13, the treated sewage and the nitrogen are separated through a three-phase separator to achieve efficient denitrification.

[0042] When the cyclone fluidized deep denitrification device of the present invention is in use, the cyclone can not only fully mix the sulfur autotrophic filler and the sewage in the main reaction barrel, but also provide upward hydraulic force to enlarge the gap between the sulfur autotrophic filler until the sulfur autotrophic filler can move freely in the fluidized area without contacting each other, so that the main reaction barrel is not easily blocked, and the situation of compaction or even failure is greatly avoided; at the same time, the mixing of sewage and the sulfur autotrophic filler is also promoted, so that the contact area between the autotrophic denitrifying bacteria on the surface of the sulfur autotrophic filler and the sewage is wider, thereby improving the denitrification efficiency, reducing the reaction residence time, and reducing the floor space of the device; increasing the contact area between the sulfur autotrophic filler and the sewage to achieve efficient denitrification; the larger specific surface area on the sulfur autotrophic filler provides a larger living space for the autotrophic denitrifying bacteria, and the unit concentration of the denitrifying bacteria is higher, so that the denitrification device has a higher impact load resistance and higher operation stability.

[0043] Embodiment 2 of a cyclone fluidized deep denitrification device provided by the present invention: The main difference between it and Example 1 is that in Example 1, the three-phase separation structure also includes a water outlet weir.

[0044] In this embodiment, no water outlet weir is provided.

[0045] Embodiment 1 of a cyclone fluidization deep denitrification process provided by the present invention: like Figure 1 and Figure 2 As shown, a cyclone fluidized deep denitrification process of the present invention uses a cyclone fluidized deep denitrification device described in any one of the above embodiments, comprising the following steps: S1. First, a set amount of sulfur autotrophic filler 13 and clean water are placed in the main reaction barrel 1; S2, sewage enters the main reaction barrel 1 along the first water inlet pipe 2, and clean water enters the main reaction barrel 1 along the second water inlet pipe 3. The flow rates of sewage and clean water are the same to generate a vortex in the main reaction barrel 1. The vortex makes the sewage fully contact with the sulfur autotrophic filler 13 in the device and forms a fluidized bed. The vortex makes the fluidized bed increase the upward water flow rate in the main reaction barrel to a state where the sulfur autotrophic filler can move freely in the bed body without contacting each other; S3. After denitrification is completed, the sulfur autotrophic filler 13, nitrogen and denitrified wastewater are separated through the three-phase separation structure arranged on the top of the main reaction barrel 1.

[0046] The flow rate of sewage and clean water is 2m / h.

[0047] When the cyclone fluidized deep denitrification process of the present invention is used, the cyclone can not only fully mix the sulfur autotrophic filler and the sewage in the main reaction barrel, but also provide upward hydraulic force to enlarge the gap between the sulfur autotrophic filler until the sulfur autotrophic filler can move freely in the fluidized area without contacting each other, so that the main reaction barrel is not easily blocked, and the situation of compaction or even failure is greatly avoided; at the same time, the mixing of sewage and the sulfur autotrophic filler is also promoted, so that the contact area between the autotrophic denitrifying bacteria on the surface of the sulfur autotrophic filler and the sewage is wider, thereby improving the denitrification efficiency, reducing the reaction residence time, and reducing the footprint of the device; increasing the contact area between the sulfur autotrophic filler and the sewage to achieve efficient denitrification; the larger specific surface area on the sulfur autotrophic filler provides a larger living space for the autotrophic denitrifying bacteria, and the unit concentration of the denitrifying bacteria is higher, so that the denitrification device has a higher impact load resistance and higher operation stability.

[0048] Embodiment 2 of a cyclone fluidization deep denitrification process provided by the present invention: The main difference between it and Example 1 is that in Example 1, the flow rates of sewage and clean water are both 2 meters per hour.

[0049] In this embodiment, the flow rates of sewage and clean water are both greater than 2 m / h, such as 3 m / h.

[0050] According to the above description of this specification, those skilled in the art may also understand that the terms used below, such as "up", "down", "front", "back", "left", "right", "width", "horizontal", "top", "bottom", "inside", "outside" and the like, which indicate orientation or positional relationships, are based on the orientation or positional relationships shown in the drawings of this specification, and are only for the purpose of facilitating the explanation of the scheme of the present invention and simplifying the description, rather than explicitly or implicitly indicating that the devices or elements involved must have the specific orientation, be constructed and operated in a specific orientation. Therefore, the above-mentioned orientation or positional relationship terms cannot be understood or interpreted as limitations on the scheme of the present invention.

[0051] The above description is only a preferred embodiment of the present invention and does not limit the present invention in any form. Although the present invention has been disclosed as a preferred embodiment as above, it is not used to limit the present invention. Any technician familiar with this profession can make some changes or modifications to equivalent embodiments of equivalent changes by using the methods and technical contents disclosed above without departing from the scope of the technical solution of the present invention. However, any simple modification, equivalent change and modification made to the above embodiments according to the technical essence of the present invention without departing from the content of the technical solution of the present invention still falls within the scope of the technical solution of the present invention.

[0052] In addition, in the description of this specification, “plurality” means at least two, for example, two, three or more, etc., unless otherwise clearly and specifically defined.

Claims

1. A cyclonic fluidized deep denitrification device, characterized in that: It includes a main reaction barrel, a first water inlet pipe, a second water inlet pipe and a three-phase separation structure; A sulfur autotrophic filler is arranged in the main reaction barrel; a first water inlet pipe and a second water inlet pipe are arranged at the lower end of the main reaction barrel and are used to connect the inside and outside of the main reaction barrel, the first water inlet pipe and the second water inlet pipe are arranged at intervals along the circumferential direction of the main reaction barrel, and the axes of the first water inlet pipe and the second water inlet pipe are arranged in parallel, one end of the first water inlet pipe away from the main reaction barrel is connected to a sewage tank, and the second water inlet pipe is used to input clean water into the main reaction barrel, and the water flow rates input into the main reaction barrel by the first water inlet pipe and the second water inlet pipe are the same and both input water in a tangential direction; a three-phase separation structure is arranged in the main reaction barrel, and is used to separate the sulfur autotrophic filler, water and gas.

2. A cyclone fluidization deep denitrification device according to claim 1, characterized in that: The three-phase separation structure includes a first baffle, a second baffle, and an air collecting hood. The first baffle is an annular plate and is arranged on the inner wall of the main reaction barrel. The first baffle has a guide surface arranged in a V shape. The tip of the V-shaped guide surface is arranged toward the axial direction of the main reaction barrel to guide water and block the sulfur autotrophic filler. The air collecting hood is arranged above the first baffle and an exhaust pipe is connected in the middle of the air collecting hood. The exhaust pipe is used to discharge nitrogen from the main reaction barrel. The second baffle is an annular plate and is arranged on the inner wall of the main reaction barrel. The second baffle is arranged from the outside to the inside and tilted downward along the radial direction of the main reaction barrel.

3. A cyclone fluidization deep denitrification device according to claim 2, characterized in that: The cross section of the first baffle is an equilateral triangle, and one side of the equilateral triangle coincides with the inner wall of the main reaction barrel.

4. A cyclone fluidization deep denitrification device according to claim 3, characterized in that: The innermost end of the second baffle is located inside the outermost end of the air collecting hood, and the lowermost end of the second baffle is located above the lowermost end of the air collecting hood.

5. A cyclone fluidization deep denitrification device according to claim 4, characterized in that: The three-phase separation structure also includes a water outlet weir, which is an annular groove arranged in the main reaction barrel with the groove facing upward. The water outlet weir is above the gas collecting hood, and a water outlet is opened on the side wall corresponding to the main reaction barrel and the water outlet weir to discharge the water in the water outlet weir.

6. A cyclone fluidization deep denitrification device according to any one of claims 1 to 5, characterized in that: The main reaction barrel is also provided with a water outlet pipe, which is connected with the second water inlet pipe to circulate the water separated by the three-phase separation structure in the main reaction barrel back to the main reaction barrel.

7. A cyclone fluidization deep denitrification device according to claim 6, characterized in that: The first water inlet pipe and the second water inlet pipe are both provided with a driving pump for controlling the flow rate.

8. A cyclone fluidized deep denitrification process, using a cyclone fluidized deep denitrification device as claimed in any one of claims 1 to 7, characterized in that: include: S1. First, a set amount of sulfur autotrophic filler and clean water are placed in the main reaction barrel; S2, sewage enters the main reaction barrel along the first water inlet pipe, and clean water enters the main reaction barrel along the second water inlet pipe. The sewage and clean water have the same flow rate and enter in the tangential direction to generate a vortex in the main reaction barrel. The vortex makes the sewage fully contact with the sulfur autotrophic filler in the device and forms a fluidized bed; S3. After denitrification is completed, the sulfur autotrophic filler, nitrogen and denitrified wastewater are separated through the three-phase separation structure set on the top of the main reaction barrel.

9. A cyclone fluidization deep denitrification process according to claim 8, characterized in that: The swirl increases the upward water flow velocity in the fluidized bed as the main reaction drum to a state where the sulfur autotrophic fillers can move freely in the bed without contacting each other.

10. A cyclone fluidization deep denitrification process according to claim 9, characterized in that: The flow rate of sewage and clean water shall not be less than 2m / h.

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