A low-carbon deep denitrification reactor and method for urban sewage to utilize NMP wastewater as a resource

Abstract

The present invention relates to a low-carbon deep denitrification reactor for urban sewage for NMP wastewater resource utilization, comprising a tank body, wherein the interior of the tank body is sequentially arranged with a water inlet mechanism, a sludge bed, a three-phase separator and an overflow weir from bottom to top; a water inlet pipe connected to a water distributor of the water inlet mechanism is installed on the side wall of the tank body, a drain pipe connected to the overflow weir is installed on the outer side of the top of the tank body, and an exhaust pipe is installed on the top side of the tank body; a conversion plate in the water inlet mechanism rotates under the action of a cylinder, and when the sewage chute of the conversion plate rotates to intersect with a support block, it is convenient to transport the sludge in the tank body to a sealed anoxic space below the water inlet mechanism of the tank body; when the sewage chute of the conversion plate rotates to completely overlap with the support block, the water inlet mechanism and the tank body are sealed, thereby realizing the sealed discharge of the sludge, and facilitating the completion of the sludge discharge when the reactor is working.

Description

Technical Field

[0001] The present invention relates to the technical field of NMP wastewater, and in particular to a low-carbon deep denitrification reactor and method for urban sewage to utilize NMP wastewater as a resource. Background Art

[0002] A large amount of distillation wastewater is generated during the distillation and dehydration process of NMP. The total nitrogen content is high, as high as 800-1200ppm, and the COD is as high as 8000ppm. It is difficult to treat and has become a bottleneck for the expansion of NMP production. The NMP wastewater is reprocessed and utilized by microorganisms as an electron donor for denitrification of urban sewage. Low-carbon deep denitrification is achieved through microorganisms, while achieving standard discharge of wastewater.

[0003] When low-carbon denitrification of mixed wastewater of NMP wastewater and urban wastewater is carried out by microbial technology, the waste liquid and sewage are located in the reactor and reacted by anaerobic microorganisms. Because during the reaction process, it is necessary to ensure that the reactor is in an oxygen-free environment, and as the reaction continues, more and more sludge accumulates in the reactor, which needs to be cleaned in time. The existing cleaning method requires opening the reactor to stop the reaction, so it is necessary to shut down for cleaning, and after each reaction, the reactor needs to be vacuumed, and the overall work is cumbersome. Summary of the Invention

[0004] The problem solved by the present invention is to provide a low-carbon deep denitrification reactor and method for urban sewage for resource utilization of NMP wastewater, which solves the technical problem that when low-carbon denitrification of mixed wastewater of NMP wastewater and urban wastewater is carried out by microbial technology, the waste liquid sewage is located in the reactor and reacts by anaerobic microorganisms. Because during the reaction process, it is necessary to ensure that the reactor is in an oxygen-free environment, and as the reaction continues, more and more sludge accumulates in the reactor, which needs to be cleaned in time. The existing cleaning method requires opening the reactor to stop the reaction, so it is necessary to shut down for cleaning, and after each reaction, the reactor needs to be vacuumed, and the overall work is cumbersome.

[0005] In order to achieve the above object, the present invention adopts the following technical solutions:

[0006] A low-carbon deep denitrification reactor for urban sewage for NMP wastewater resource utilization, comprising a tank body, wherein the interior of the tank body is sequentially arranged from bottom to top with a water inlet mechanism, a sludge bed, a three-phase separator, and an overflow weir; a water inlet pipe connected to a water distributor of the water inlet mechanism is installed on the side wall of the tank body; a drain pipe connected to the overflow weir is installed on the outside of the top of the tank body; and an exhaust pipe is installed on the top side of the tank body;

[0007] The water inlet mechanism includes a truncated cone-shaped water distributor, which is provided with a plurality of water inlet holes. A plurality of support blocks are installed at fan-shaped equal angles on the outside of the water distributor, and the support blocks are fixedly connected to the inner wall of the tank. A circular conversion plate is rotatably installed on the bottom side of the water distributor, and a plurality of sewage troughs are opened on the conversion plate at fan-shaped equal angles.

[0008] Preferably, the top side of the support block is set to be a slope, the coverage area of ​​the bottom side of the support block is larger than the sewage trough, and the number of support blocks and sewage troughs is the same.

[0009] Preferably, a gear ring is provided on the bottom side of the conversion plate, a cylinder is installed on the outside of the tank body, a rack is installed on the telescopic end of the cylinder, and the rack is meshed with the gear ring.

[0010] Preferably, a truncated cone-shaped filter cover is installed inside the tank body and below the water inlet mechanism, a first rotating shaft is rotatably installed in the filter cover, and a plurality of material-diverting plates are installed at equal angles on the first rotating shaft, and the material-diverting plates are close to the outer wall of the filter cover.

[0011] Preferably, a plurality of first drainage grooves are opened at equal angles on the outer side of the bottom of the tank body, a baffle plate is rotatably installed on the outer side of the bottom of the tank body, and a plurality of second drainage grooves are opened at equal angles on the baffle plate.

[0012] Preferably, the number of the first drain troughs, the second drain troughs and the material-diverting plates is the same, the length of the first drain trough and the first drain trough is the same, the spacing between adjacent material-diverting plates is twice the length of the first drain trough, the support part is between adjacent first drain troughs, the covering part is between adjacent second drain troughs, and the material-diverting plate moves between the two ends of the support part.

[0013] Preferably, the baffle plate is connected to the outer wall of the tank body via a bearing, a sealing strip is provided between the baffle plate and the tank body, and external teeth are provided on the outer side of the baffle plate.

[0014] Preferably, a support plate is installed on the outer side of the tank body, a motor is installed on the support plate, an output end of the motor is connected to the second rotating shaft, and a rotating tooth meshing with the external tooth is installed on the top end of the second rotating shaft.

[0015] Preferably, a transmission box is installed on the bottom side of the tank body, the input end of the transmission box is connected to the second rotating shaft, and the output end of the transmission box is connected to the first rotating shaft.

[0016] A low-carbon deep denitrification method for urban sewage to recycle NMP wastewater, the specific operating steps of the method are as follows:

[0017] Step 1: The mixed wastewater generated during the distillation and dehydration of NMP and urban sewage is added to the anaerobic tank. Microorganisms decompose nitrogen-containing organic matter into ammonia nitrogen. Then, the ammonia nitrogen is first oxidized into nitrate through nitrification reaction in the aerobic tank. Water is introduced into the reactor. Under anoxic conditions, microorganisms carry out denitrification reaction to reduce the nitrate into gaseous nitrogen and remove it from the water.

[0018] Step 2: The sewage enters the tank through the water inlet pipe and the water distributor. At this time, the sewage to be treated is mixed with the sludge in the sludge bed. The microorganisms in the sludge undergo denitrification reaction to reduce nitrate to gaseous nitrogen. The gaseous nitrogen is continuously released in the form of tiny bubbles. The tiny bubbles merge and grow larger during the rising process. At the top of the sludge bed, due to the stirring of the gaseous nitrogen, a sludge with a relatively low sludge concentration is formed. It rises with the water and enters the three-phase separator. When the gaseous nitrogen hits the reflector at the bottom of the three-phase separator, it is deflected to the four sides of the reflector, and then passes through the water layer into the gas chamber. The gaseous nitrogen concentrated in the gas chamber is discharged through the exhaust pipe. The solid-liquid mixture is reflected and enters the sedimentation area of ​​the three-phase separator. The sludge in the sewage flocculates, the particles gradually increase in size, and settle under the action of gravity. The sludge settled on the inclined wall slides back to the sludge bed along the inclined wall, causing a large amount of sludge to accumulate in the sludge bed. The treated water after separation from the sludge overflows from the upper part of the overflow weir.

[0019] Step 3: The sludge in the sludge bed needs to be cleaned regularly. At this time, the cylinder drives the rack to move, driving the meshing gear ring to rotate. At this time, the conversion plate rotates on the bottom side of the water distributor until the sewage trough and the support block are staggered. At this time, the sludge in the tank body enters the sewage trough along the slope and falls on the filter cover for sludge and sewage to be filtered. The filtered sewage is located under the filter cover, while the sludge is located on the filter cover. Then the cylinder works to rotate the conversion plate to its original state. The sewage trough is located at the bottom of the support block. The conversion plate and the support block cooperate to achieve the sealing of the tank body.

[0020] Step 4: The second rotating shaft and the rotating teeth are driven by the motor to rotate, and cooperate with the meshing external teeth to drive the baffle plate to rotate. As the baffle plate rotates, the staggered first sewage trough and the second sewage trough gradually overlap, and the sludge on the filter cover is discharged from the first sewage trough and the second sewage trough. At the same time, the rotation of the second rotating shaft drives the first rotating shaft to rotate through the transmission box. The first rotating shaft drives the material plate to rotate along the filter cover, pushing the sludge between the support part and the filter cover to the first sewage trough and the second sewage trough for discharge. Subsequently, the motor rotates the baffle plate to the initial position. At this time, the covering part of the baffle plate covers the outside of the first sewage trough, and the second sewage trough is located outside the support part, and the bottom of the tank is sealed by the baffle plate.

[0021] The beneficial effects of the present invention are as follows: the conversion plate in the water inlet mechanism rotates under the action of the cylinder, and when the sewage trough of the conversion plate rotates to intersect with the support block, it is convenient to transport the sludge in the tank body to the sealed anoxic space below the water inlet mechanism of the tank body; when the sewage trough of the conversion plate rotates to completely overlap with the support block, the water inlet mechanism and the tank body are sealed, thereby achieving sealed discharge of sludge, and facilitating sludge discharge when the reactor is working;

[0022] The sludge and sewage are filtered on the filter cover, and the filtered sewage is located under the filter cover and refluxed through the reflux pipe, while the sludge is located on the filter cover. The motor realizes the rotation of the baffle plate and the stripper plate. When the first sewage trough and the second sewage trough gradually overlap, the sludge on the filter cover is discharged from the first sewage trough and the second sewage trough, and multiple sewage troughs are used for sludge discharge, which greatly improves the discharge efficiency. When the first sewage trough and the second sewage trough are staggered, the baffle plate is used to seal the bottom of the tank body; and the rotating stripper plate pushes the sludge between the support part and the filter cover to the first sewage trough and the second sewage trough for discharge, thereby realizing automatic separation and discharge of sludge and sewage, realizing step-by-step transportation of sludge, and avoiding air from entering the reaction area of ​​the tank body. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0024] Figure 2 It is an overall cross-sectional view of the present invention;

[0025] Figure 3 This is a schematic diagram of the water inlet mechanism and filter cover installation structure of the present invention;

[0026] Figure 4 This is a schematic structural diagram of the water inlet mechanism of the present invention;

[0027] Figure 5 This is a schematic diagram of the filter cover installation structure of the present invention;

[0028] Figure 6 It is a top view of the filter cover of the present invention.

[0029] Legend:

[0030] 1. Tank body; 2. Water inlet mechanism; 3. Sludge bed; 4. Three-phase separator; 5. Overflow weir; 6. Water inlet pipe; 7. Drain pipe; 8. Exhaust pipe; 9. Water distributor; 10. Water inlet hole; 11. Support block; 12. Slope; 13. Conversion plate; 14. Sewage chute; 15. Cylinder; 16. Rack; 17. Gear ring; 18. Filter cover; 19. Return pipe; 20. First rotating shaft; 21. Material shifting plate; 22. First sewage chute; 23. Retaining ring plate; 24. Second sewage chute; 25. Support plate; 26. Motor; 27. Second rotating shaft; 28. Transmission box; 29. ​​Rotating gear; 30. External gear. DETAILED DESCRIPTION

[0031] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative efforts shall fall within the scope of protection of the present invention.

[0032] Specific examples are given below.

[0033] See also Figures 1 to 6 A low-carbon deep denitrification reactor for urban sewage for NMP wastewater resource utilization includes a tank body 1. The interior of the tank body 1 is sequentially arranged from bottom to top with a water inlet mechanism 2, a sludge bed 3, a three-phase separator 4 and an overflow weir 5. A water inlet pipe 6 connected to a water distributor 9 of the water inlet mechanism 2 is installed on the side wall of the tank body 1. A drainage pipe 7 connected to the overflow weir 5 is installed on the outside of the top of the tank body 1. An exhaust pipe 8 is installed on the top side of the tank body 1.

[0034] The water inlet mechanism 2 includes a truncated cone-shaped water distributor 9, which is provided with a plurality of water inlet holes 10. The outer side of the water distributor 9 is provided with a plurality of support blocks 11 at fan-shaped equal angles, and the support block 11 is fixedly connected to the inner wall of the tank body 1. A circular conversion plate 13 is rotatably installed on the bottom side of the water distributor 9. A plurality of drainage troughs 14 are provided on the conversion plate 13 at fan-shaped equal angles. The top side of the support block 11 is provided with a slope 12 to facilitate the automatic rolling down of the sludge along the slope 12, thereby preventing the sludge from accumulating on the support block 11 and being unable to be discharged. The coverage area of ​​the bottom side of the support block 11 is larger than the drainage trough 14, and the number of the support block 11 and the drainage trough 14 is the same. A gear ring 17 is provided on the bottom side of the conversion plate 13, and a cylinder 15 is installed on the outside of the tank body 1. A rack 16 is installed on the telescopic end of the cylinder 15, and the rack 16 is engaged with the gear ring 17. The rack 16 is driven by the cylinder 15 to move, driving the engaged gear ring 17 to rotate. At this time, the conversion plate 13 rotates on the bottom side of the water distributor 9. When the sewage chute 14 of the conversion plate 13 rotates to intersect with the support block 11, it is convenient to transport the sludge in the tank body 1 to the sealed anoxic space below the water inlet mechanism 2 of the tank body 1. When the sewage chute 14 of the conversion plate 13 rotates to completely overlap with the support block 11, the water inlet mechanism 2 and the tank body 1 are sealed.

[0035] A truncated cone-shaped filter cover 18 is installed inside the tank body 1 and below the water inlet mechanism 2. A first rotating shaft 20 is rotatably installed in the filter cover 18. A plurality of material-dispensing plates 21 are installed at equal angles on the first rotating shaft 20, and the material-dispensing plates 21 are close to the outer wall of the filter cover 18. A plurality of first drainage grooves 22 are opened at equal angles on the outside of the bottom of the tank body 1. A baffle plate 23 is rotatably installed on the outside of the bottom of the tank body 1, and a plurality of second drainage grooves 24 are opened at equal angles on the baffle plate 23. The number of the first drainage groove 22, the second drainage groove 24 and the material-dispensing plate 21 is the same. 22 and the first sewage trough 22 are of the same length, the spacing between adjacent stripping plates 21 is twice the length of the first sewage trough 22, the adjacent first sewage troughs 22 are between the support portion, and the adjacent second sewage troughs 24 are between the covering portion. The stripping plate 21 moves between the two ends of the support portion to facilitate complete coverage of the first sewage trough 22 by the covering portion, and the stripping plate 21 moves between the two ends of the support portion to facilitate pushing the sludge between the support portion and the filter cover 18 to the first sewage trough 22, the baffle plate 23 is connected to the outer wall of the tank body 1 through a bearing, and a baffle plate 23 is provided between the tank body 1 A sealing strip is provided, and an external tooth 30 is provided on the outside of the baffle plate 23 to facilitate the sealing connection between the baffle plate 23 and the tank body 1. A support plate 25 and an air pump are installed on the outside of the tank body 1. The air pump is used to vacuum and deoxygenate the space of the tank body 1 below the water inlet mechanism 2. A motor 26 is installed on the support plate 25. The output end of the motor 26 is connected to the second rotating shaft 27, and a rotating tooth 29 engaged with the external tooth 30 is installed on the top of the second rotating shaft 27. The second rotating shaft 27 and the rotating tooth 29 are driven by the motor 26 to rotate, and cooperate with the meshing external tooth 30 to drive the baffle plate 23 to rotate, and the tank body 1 A transmission box 28 is installed on the bottom side, and the input end of the transmission box 28 is connected to the second rotating shaft 27, and the output end of the transmission box 28 is connected to the first rotating shaft 20. The rotation of the second rotating shaft 27 is driven by the transmission box 28 to drive the first rotating shaft 20 to rotate, and the first rotating shaft 20 drives the material plate 21 to rotate along the filter cover 18. When the first sewage trough 22 and the second sewage trough 24 gradually overlap, the sludge on the filter cover 18 is discharged from the first sewage trough 22 and the second sewage trough 24. When the first sewage trough 22 and the second sewage trough 24 are staggered, the bottom of the tank body 1 is sealed by the baffle plate 23.

[0036] A low-carbon deep denitrification method for urban sewage to utilize NMP wastewater as a resource. The specific operating steps of the method are as follows:

[0037] Step 1: The mixed wastewater generated during the distillation and dehydration of NMP and urban sewage is added to the anaerobic tank. Microorganisms decompose nitrogen-containing organic matter into ammonia nitrogen. Then, the ammonia nitrogen is first oxidized into nitrate through nitrification reaction in the aerobic tank. Water is introduced into the reactor. Under anoxic conditions, microorganisms carry out denitrification reaction to reduce the nitrate into gaseous nitrogen and remove it from the water.

[0038] Step 2: The sewage enters the tank body 1 through the water inlet pipe 6 and the water distributor 9. At this time, the sewage to be treated is mixed with the sludge in the sludge bed 3. The microorganisms in the sludge undergo a denitrification reaction to reduce nitrate to gaseous nitrogen. The gaseous nitrogen is continuously released in the form of tiny bubbles. The tiny bubbles merge and grow larger during the rising process. At the upper part of the sludge bed 3, due to the stirring of the gaseous nitrogen, a sludge with a relatively low sludge concentration is formed. It rises together with the water and enters the three-phase separator 4. When the gaseous nitrogen hits the reflective plate at the lower part of the three-phase separator 4, it is bent to the four sides of the reflective plate, and then passes through the water layer into the air chamber. The gaseous nitrogen concentrated in the air chamber is discharged through the exhaust pipe 8. The solid-liquid mixture is reflected and enters the sedimentation area of ​​the three-phase separator 4. The sludge in the sewage flocculates, the particles gradually increase in size, and settle under the action of gravity. The sludge settled on the inclined wall slides back to the sludge bed 3 along the inclined wall, so that a large amount of sludge accumulates in the sludge bed 3. The treated water after separation from the sludge overflows from the upper part of the overflow weir 5.

[0039] Step 3: The sludge in the sludge bed 3 needs to be cleaned regularly. At this time, the rack 16 is driven by the cylinder 15 to move, and the meshing gear ring 17 is driven to rotate. At this time, the conversion plate 13 rotates on the bottom side of the water distributor 9 until the sewage trough 14 and the support block 11 are staggered. At this time, the sludge in the tank body 1 enters the sewage trough 14 along the slope 12 and falls on the filter cover 18 for filtering the sludge and sewage. The filtered sewage is located below the filter cover 18, and the sludge is located on the filter cover 18. Then the cylinder 15 works to rotate the conversion plate 13 to its original state. The sewage trough 14 is located at the bottom of the support block 11. The conversion plate 13 cooperates with the support block 11 to achieve the sealing of the tank body 1;

[0040] Step 4: The first rotating shaft 20 and the rotating teeth 29 are driven to rotate by the motor 26, and cooperate with the meshing external teeth 30 to drive the baffle plate 23 to rotate. As the baffle plate 23 rotates, the staggered first sewage trough 22 and the second sewage trough 24 gradually overlap, and the sludge on the filter cover 18 is discharged from the first sewage trough 22 and the second sewage trough 24. At the same time, the first rotating shaft 20 rotates and drives the second rotating shaft 27 to rotate through the transmission box 28. The second rotating shaft 27 drives the material plate 21 to rotate along the filter cover 18, pushing the sludge between the support part and the filter cover 18 to the first sewage trough 22 and the second sewage trough 24 for discharge. Subsequently, the motor 26 is used to rotate the baffle plate 23 to the initial position. At this time, the covering part of the baffle plate 23 covers the outside of the first sewage trough 22, and the second sewage trough 24 is located outside the support part, and then the baffle plate 23 is used to seal the bottom of the tank body 1.

[0041] The conversion plate 13 in the water inlet mechanism 2 rotates under the action of the cylinder 15. When the sewage trough 14 of the conversion plate 13 rotates to intersect with the support block 11, the sludge in the tank body 1 is easily transported to the sealed anoxic space below the water inlet mechanism 2 of the tank body 1. When the sewage trough 14 of the conversion plate 13 rotates to completely overlap with the support block 11, the water inlet mechanism 2 and the tank body 1 are sealed, thereby achieving sealed discharge of sludge and facilitating sludge discharge when the reactor is working.

[0042] The sludge and sewage are filtered on the filter cover 18, and the filtered sewage is located under the filter cover 18 and refluxed through the reflux pipe 19, while the sludge is located on the filter cover 18. The motor 26 is used to realize the rotation of the baffle plate 23 and the stripper plate 21. When the first sewage trough 22 and the second sewage trough 24 gradually overlap, the sludge on the filter cover 18 is discharged from the first sewage trough 22 and the second sewage trough 24. When the first sewage trough 22 and the second sewage trough 24 are staggered, the bottom of the tank body 1 is sealed by the baffle plate 23; and the rotating stripper plate 21 pushes the sludge between the support part and the filter cover 18 to the first sewage trough 22 and the second sewage trough 24 for discharge, thereby realizing automatic separation and discharge of the sludge and sewage, realizing step-by-step transportation of the sludge, and preventing air from entering the reaction area of ​​the tank body 1.

[0043] The above description is only a preferred specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any technician familiar with the technical field, within the technical scope disclosed by the present invention, who makes equivalent replacements or changes based on the technical solution and inventive concept of the present invention, should be covered by the scope of protection of the present invention.

Claims

1. A low-carbon deep denitrification reactor for urban sewage for NMP wastewater resource utilization, characterized in that: The invention comprises a tank body (1), wherein the inside of the tank body (1) is provided with a water inlet mechanism (2), a sludge bed (3), a three-phase separator (4) and an overflow weir (5) in order from bottom to top; a water inlet pipe (6) connected to a water distributor (9) of the water inlet mechanism (2) is installed on the side wall of the tank body (1); a drainage pipe (7) connected to the overflow weir (5) is installed on the outside of the top of the tank body (1); and an exhaust pipe (8) is installed on the top side of the tank body (1); The water inlet mechanism (2) includes a truncated cone-shaped water distributor (9), a plurality of water inlet holes (10) are provided on the water distributor (9), a plurality of support blocks (11) are installed on the outer side of the water distributor (9) at fan-shaped equal angles, and the support blocks (11) are fixedly connected to the inner wall of the tank body (1), a circular conversion plate (13) is rotatably installed on the bottom side of the water distributor (9), and a plurality of sewage troughs (14) are provided on the conversion plate (13) at fan-shaped equal angles. When the sewage troughs (14) of the conversion plate (13) are rotated to intersect with the support blocks (11), it is convenient to transport the sludge in the tank body (1) to the bottom of the water inlet mechanism (2) of the tank body (1), and when the sewage troughs (14) of the conversion plate (13) are rotated to completely overlap with the support blocks (11), the water inlet mechanism (2) and the tank body (1) are sealed. A truncated cone-shaped filter cover (18) is installed inside the tank body (1) and below the water inlet mechanism (2). A first rotating shaft (20) is rotatably installed in the filter cover (18). A plurality of material-dispensing plates (21) are installed at equal angles on the first rotating shaft (20), and the material-dispensing plates (21) are close to the outer wall of the filter cover (18). A plurality of first sewage drain grooves (22) are opened at equal angles on the outer side of the bottom of the tank body (1). A baffle plate (23) is rotatably installed on the outer side of the bottom of the tank body (1), and a plurality of second sewage drain grooves (24) are opened at equal angles on the baffle plate (23). The number of the first sewage drain grooves (22), the second sewage drain grooves (24) and the material-dispensing plates (21) are the same and adjacent. The spacing between the material-diverting plates (21) is twice the length of the first sewage trough (22), the space between adjacent first sewage troughs (22) is a support portion, and the space between adjacent second sewage troughs (24) is a covering portion. The material-diverting plates (21) move between the two ends of the support portion to facilitate pushing the sludge between the support portion and the filter cover (18) to the first sewage trough (22). When the first sewage trough (22) and the second sewage trough (24) gradually overlap, the sludge on the filter cover (18) is discharged from the first sewage trough (22) and the second sewage trough (24). When the first sewage trough (22) and the second sewage trough (24) are staggered, the bottom of the tank body (1) is sealed by the retaining ring plate (23).

2. A low-carbon deep denitrification reactor for urban sewage according to claim 1, characterized in that: The top side of the support block (11) is configured as a slope (12), the bottom side of the support block (11) covers an area larger than the sewage trough (14), and the number of the support blocks (11) and the sewage trough (14) is the same.

3. A low-carbon deep denitrification reactor for urban sewage according to claim 2, characterized in that: A gear ring (17) is provided on the bottom side of the conversion plate (13), a cylinder (15) is installed on the outside of the tank body (1), a rack (16) is installed at the telescopic end of the cylinder (15), and the rack (16) is meshed with the gear ring (17).

4. A low-carbon deep denitrification reactor for urban sewage according to claim 3, characterized in that: The baffle plate (23) is connected to the outer wall of the tank body (1) via a bearing, and a sealing strip is provided between the baffle plate (23) and the tank body (1). External teeth (30) are provided on the outer side of the baffle plate (23).

5. A low-carbon deep denitrification reactor for urban sewage according to claim 4 for NMP wastewater resource utilization, characterized in that, A support plate (25) is installed on the outside of the tank body (1), and a motor (26) is installed on the support plate (25). The output end of the motor (26) is connected to the second rotating shaft (27), and the top end of the second rotating shaft (27) is installed with a rotating tooth (29) that meshes with the external tooth (30).

6. A low-carbon deep denitrification reactor for urban sewage according to claim 5, characterized in that, A transmission box (28) is installed on the bottom side of the tank body (1), the input end of the transmission box (28) is connected to the second rotating shaft (27), and the output end of the transmission box (28) is connected to the first rotating shaft (20).

7. A low-carbon deep denitrification method for urban sewage to utilize NMP wastewater as a resource, characterized in that: The specific steps of this method are as follows: Step 1: adding a mixture of wastewater generated during the distillation and dehydration process of NMP and urban sewage into an anaerobic tank, decomposing nitrogen-containing organic matter into ammonia nitrogen by microorganisms, and then oxidizing the ammonia nitrogen into nitrate by nitrification in an aerobic tank, introducing water into the reactor according to any one of claims 1 to 6, and under anoxic conditions, reducing the nitrate to gaseous nitrogen by denitrification reaction by microorganisms to remove it from the water; Step 2: The sewage enters the tank (1) through the water inlet pipe (6) and the water distributor (9). At this time, the sewage to be treated is mixed with the sludge in the sludge bed (3). The microorganisms in the sludge undergo denitrification and reduce nitrate to gaseous nitrogen. The gaseous nitrogen is continuously released in the form of tiny bubbles. The tiny bubbles merge and grow larger during the rising process. At the top of the sludge bed (3), due to the stirring of the gaseous nitrogen, a sludge with a relatively low concentration is formed. The sludge rises together with the water and enters the three-phase separator (4). The gaseous nitrogen encounters the three-phase separator. When the nitrogen gas hits the reflective plate at the bottom of the separator (4), it is folded around the reflective plate and then passes through the water layer into the gas chamber. The gaseous nitrogen concentrated in the gas chamber is discharged through the exhaust pipe (8). The solid-liquid mixture enters the sedimentation area of ​​the three-phase separator (4) after reflection. The sludge in the sewage flocculates and the particles gradually grow larger and settle under the action of gravity. The sludge settled on the inclined wall slides back to the sludge bed (3) along the inclined wall, so that a large amount of sludge accumulates in the sludge bed (3). The treated water separated from the sludge overflows from the upper part of the overflow weir (5); Step 3: The sludge in the sludge bed (3) needs to be cleaned regularly. At this time, the cylinder (15) drives the rack (16) to move, and drives the meshing gear ring (17) to rotate. At this time, the conversion plate (13) rotates on the bottom side of the water distributor (9) until the sewage trough (14) and the support block (11) are staggered. At this time, the sludge in the tank body (1) enters the sewage trough (14) along the slope (12) and falls on the filter cover (18) to filter the sludge and sewage. The filtered sewage is located under the filter cover (18), and the sludge is located on the filter cover (18). Then the cylinder (15) works to rotate the conversion plate (13) to its original state. The sewage trough (14) is located at the bottom of the support block (11). The conversion plate (13) cooperates with the support block (11) to achieve the sealing of the tank body (1); Step 4: The second rotating shaft (27) and the rotating gear (29) are driven to rotate by the motor (26), and the outer gear (30) is engaged with the meshing to drive the baffle plate (23) to rotate. As the baffle plate (23) rotates, the staggered first sewage trough (22) and the second sewage trough (24) gradually overlap, and the sludge on the filter cover (18) is discharged from the first sewage trough (22) and the second sewage trough (24). At the same time, the second rotating shaft (27) rotates through the transmission box (28) to drive the first rotating shaft (20) to rotate. The first rotating shaft (20) drives the material-dispensing plate (21) to rotate along the filter cover (18), pushing the sludge between the support portion and the filter cover (18) to be discharged to the first sewage trough (22) and the second sewage trough (24). Subsequently, the motor (26) rotates the baffle plate (23) to the initial position. At this time, the covering portion of the baffle plate (23) covers the outside of the first sewage trough (22), and the second sewage trough (24) is located outside the support portion, thereby achieving sealing of the bottom of the tank body (1) through the baffle plate (23).

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