Highly loaded denitration column reactor

Abstract

The application discloses a high-load denitrogenation tower reactor, a feeding area, a reaction area and a water outlet area are sequentially formed from bottom to top in a reactor shell, a water outlet is arranged on the side wall of the water outlet area, nitrogen-containing wastewater and carbon sources can enter the feeding area of the reactor shell through a material distributor fixed on the side wall of the lower end of the reactor shell, an upper grid plate and a lower grid plate are fixedly installed in the reactor shell and are spaced apart from each other to form a denitrogenation reaction area, the denitrogenation reaction area is filled with denitrification bacteria and fillers, the lower grid plate located at the junction of the feeding area and the reaction area can disperse the nitrogen-containing wastewater and the carbon sources upwards, the reaction area above the upper grid plate forms a fluidized reaction area, the fluidized reaction area is filled with denitrification granular sludge, and a degasser fixed to the upper end of the fluidized reaction area can separate sludge and gas in the water flow leaving the fluidized reaction area, and the application avoids loss of denitrification fluidized bed granular sludge and improves the denitrogenation denitrification treatment load level.

Description

Technical Field

[0001] This invention relates to the field of wastewater treatment technology, and in particular to a high-load denitrification tower reactor. Background Technology

[0002] Compared to fixed beds, denitrifying fluidized beds have the advantage of high mixing and mass transfer efficiency, allowing granular sludge, nitrate nitrogen, and carbon sources to be completely mixed.

[0003] After removing nitrate nitrogen, granular sludge produces nitrogen gas. Granular sludge has a strong adsorption effect on nitrogen gas and is not easy to degas. This makes the buoyancy of granular sludge enriched with a large amount of nitrogen increase, causing it to float and be lost. As a result, the denitrification effect in the reaction zone deteriorates or is even completely lost. Summary of the Invention

[0004] To overcome the above-mentioned defects, the present invention provides a high-load denitrification tower reactor, which completely solves the problem of reduced denitrification effect caused by the loss of granular sludge from the denitrification fluidized bed.

[0005] The technical solution adopted by this invention to solve its technical problem is as follows: A high-load denitrification tower reactor includes a reactor shell, in which a feed zone, a reaction zone, and an effluent zone are sequentially formed from bottom to top. An effluent zone has an outlet on its side wall for discharging denitrified wastewater. The reactor also includes a material distributor, a degasser, an upper grid plate, and a lower grid plate. The material distributor is fixedly installed on the lower side wall of the reactor shell. Nitrogenous wastewater and carbon sources can enter the feed zone of the reactor shell through the material distributor. The lower grid plate and the upper grid plate are fixedly installed on the inner side wall of the reactor shell from bottom to top at intervals. The lower grid plate is located at the feed zone. At the junction of the material zone and the reaction zone, the lower grid plate can disperse the nitrogen-containing wastewater and carbon source in the effluent from the material distributor upwards. The reaction zone located between the upper and lower grid plates inside the reactor shell forms a denitrification reaction zone, and the reaction zone located above the upper grid plate inside the reactor shell forms a fluidized reaction zone. The denitrification reaction zone is filled with packing material with a particle size larger than the grid aperture of the upper and lower grid plates. The packing material is enriched with denitrifying bacteria. The fluidized reaction zone is filled with denitrifying granular sludge. A deaerator is fixedly installed at the upper end of the fluidized reaction zone. The deaerator can separate the sludge from the sludge in the water flowing from the fluidized reaction zone toward the effluent zone.

[0006] As a further improvement of the present invention, a reflux outlet is provided on the side wall of the outlet area of ​​the reactor shell. The height of the reflux outlet is lower than that of the outlet. The reflux outlet is connected to the material distributor through a reflux water pipe, and part of the denitrification water in the outlet area is refluxed back into the material distributor to mix with nitrogen-containing wastewater and carbon source.

[0007] As a further improvement of the present invention, the material distributor includes a material distribution main pipe, a material distribution branch pipe, and a square four-way connector. An inlet is provided on the lower side wall of the reactor shell. The material distribution main pipe is sealed and inserted into the inlet. One end of the material distribution main pipe located outside the reactor shell is connected to the nitrogen-containing wastewater, the carbon source supply device, and the return water pipe. The other end of the material distribution main pipe located inside the reactor shell is connected to the feed inlet at the top of the square four-way connector. One end of each material distributor branch pipe is connected to the discharge outlet on each side of the square four-way connector. The other end of each material distributor branch pipe forms a material spray outlet.

[0008] As a further improvement of the present invention, the main pipe of the material distributor is a horizontal column-shaped pipe, the bottom surface of the square four-way is parallel to the bottom surface of the reactor shell, and the square four-way is located at the radial center of the feeding area. The material spray outlet of the material distributor branch pipe can spray material vertically downward, and the distance between the material spray outlet of the material distributor branch pipe and the bottom surface of the reactor shell is 5-10cm.

[0009] As a further improvement of the present invention, a cylindrical shell is sealed and embedded inside the reactor shell. The upper grid plate and the lower grid plate are respectively fixedly covered on the upper and lower openings of the cylindrical shell. The cylindrical shell, the upper grid plate and the lower grid plate together form a fixed bed. The packing fills the fixed bed. The upper grid plate and the lower grid plate have square grid bars arranged at equal intervals inside. The lower grid plate is horizontally tangent to the outer diameter of the main pipe of the material distributor.

[0010] As a further improvement of the present invention, the reactor shell is provided with a number of monitoring connection ports arranged from bottom to top on the side wall of the fluidized reaction zone. A monitoring tube is sealed to the monitoring connection port and a monitoring port is provided on the monitoring tube. The denitrifying granular sludge in the fluidized reaction zone can flow out of the reactor through the monitoring port for bacterial activity monitoring. The monitoring port is also provided with a control valve that can open or close it.

[0011] As a further improvement of the present invention, the degasser includes a cyclone feed pipe, a cylindrical cyclone shell, and a conical cyclone shell. The conical cyclone shell is a conical cylindrical structure with an upper inner diameter larger than the lower inner diameter. The lower end of the cylindrical cyclone shell and the upper end of the conical cyclone shell are sealed together. The cyclone feed pipe and the cylindrical cyclone shell are horizontally spun together. The lower conical opening of the conical cyclone shell is connected to the fluidized reaction zone of the reactor. The bottom monitoring port of the fluidized reaction zone is connected to the cyclone feed pipe through a sludge discharge pipe. The denitrified granular sludge in the bottom monitoring port of the fluidized reaction zone can be pumped from the sludge discharge pipe to the cyclone feed pipe. Large particles of denitrified granular sludge are discharged from the lower conical opening of the conical cyclone shell after passing through the cyclone. The nitrogen gas attached to the denitrified granular sludge overflows from the upper end of the cylindrical cyclone shell.

[0012] As a further improvement of the present invention, the outer diameter of the cylindrical swirl shell of the degasser is smaller than the inner diameter of the fluidized reaction zone of the reactor shell, and the cylindrical swirl shell and the fluidized reaction zone of the reactor shell are concentrically arranged. The swirl feed pipe passes through the side wall of the fluidized reaction zone of the reactor shell and extends to the outside of the reactor shell. The top of the cylindrical swirl shell is located between the two uppermost monitoring ports on the side wall of the reactor shell.

[0013] As a further improvement of the present invention, the lower end of the reactor shell is provided with a base for fixed installation on the ground, and the bottom surface of the reactor shell is provided with an exhaust connection port, an exhaust pipe is connected to the exhaust connection port, and a control valve capable of opening and closing is provided in the exhaust pipe. The inner diameter of the feed zone and the reaction zone of the reactor shell are the same, the inner diameter of the water outlet zone is larger than the inner diameter of the reaction zone, and the lower end of the water outlet zone is connected to the upper end of the reaction zone through a conical transition.

[0014] As a further improvement of the present invention, two inclined plates are fixedly installed in the water outlet area of ​​the reactor shell, and the two inclined plates are symmetrically arranged along the horizontal plane, forming a V-shaped water flow channel between the upper and lower inclined plates, and the height of the two inclined plates is lower than the horizontal height of the return water outlet connection port.

[0015] The beneficial effects of this invention are as follows: This invention utilizes a combination of fixed bed and fluidized bed, and incorporates a cyclone degassing structure in the fluidized reaction zone. This completely solves the problem of reduced denitrification efficiency caused by the loss of granular sludge from the denitrification fluidized bed. The fixed bed not only performs preliminary denitrification, contributing to the overall system's denitrification function, but the denitrifying bacteria propagated in the fixed bed also provide inoculum for the granular sludge in the fluidized reaction zone, preventing a decrease in biomass due to the loss of aging and disintegrating granular sludge and maintaining normal biomass in the fluidized reaction zone. The cyclone degasser in the fluidized reaction zone plays a crucial role in stripping nitrogen from the granular sludge. Denser granular sludge returns to the fluidized reaction zone from the lower conical opening at the bottom of the cyclone degasser, while lighter nitrogen overflows from the top, effectively solving the problem of granular sludge floating in the fluidized bed. This invention's tower reactor, combining a fixed bed and a fluidized bed, ensures a basic denitrification load in the fixed bed reaction zone, while the fluidized bed section can further enhance denitrification to a higher treatment load level. Attached Figure Description

[0016] Figure 1 This is a perspective view of the present invention;

[0017] Figure 2 This is a front view illustrating the structural principle of the present invention;

[0018] Figure 3 This is a perspective view of the material dispenser of the present invention;

[0019] Figure 4This is a perspective view of the reactor shell of the present invention;

[0020] Figure 5 This is a perspective view of the cyclone degasser of the present invention;

[0021] Figure 6 This is a perspective view of the fixed bed of the present invention;

[0022] Figure 7 This is a perspective view of the inclined plate of the present invention;

[0023] Figure 8 This is a state diagram for the use of the present invention. Detailed Implementation

[0024] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0025] Example: A high-load denitrification tower reactor includes a reactor shell 2, within which a feed zone 23, a reaction zone 23, and an effluent zone 25 are sequentially formed from bottom to top. The effluent zone 25 has an outlet 5 on its side wall for discharging denitrified wastewater. The reactor also includes a material distributor 1, a degasser 3, an upper grid plate 82, and a lower grid plate 83. The material distributor 1 is fixedly installed on the lower side wall of the reactor shell 2, allowing nitrogen-containing wastewater and carbon sources to enter the feed zone of the reactor shell 2 via the material distributor 1. The lower grid plate 83 and the upper grid plate 82 are fixedly installed on the inner side wall of the reactor shell 2 from bottom to top at intervals. The lower grid plate 83 is located at the boundary between the feed zone and the reaction zone 23. The grid plate 83 can disperse the nitrogen-containing wastewater and carbon source in the effluent of the material distributor 1 upwards. The reaction zone 23 located between the upper grid plate 82 and the lower grid plate 83 in the reactor shell 2 forms a denitrification reaction zone 23. The reaction zone 23 located above the upper grid plate 82 in the reactor shell 2 forms a fluidized reaction zone 23. The denitrification reaction zone 23 is filled with packing material with a particle size larger than the grid aperture of the upper grid plate 82 and the lower grid plate 83. The packing material is enriched with denitrifying bacteria. The fluidized reaction zone 23 is filled with denitrifying granular sludge. The deaerator 3 is fixedly installed in the upper end of the fluidized reaction zone 23. The deaerator 3 can separate the sludge and gas in the water flowing from the fluidized reaction zone 23 toward the effluent zone 25.

[0026] Nitrogenous wastewater and carbon source enter the feed zone of reactor shell 2 through material distributor 1. The mixed nitrogenous wastewater and carbon source flow upward along reactor shell 2 through material distributor 1. When the nitrogenous wastewater and carbon source pass through the lower grid plate 83, they are evenly dispersed by the uniformly distributed grid holes on the lower grid plate 83, so that the nitrogenous wastewater and carbon source enter the denitrification reaction zone 23 evenly. After contacting the denitrifying bacteria in the packing, the nitrogenous wastewater and carbon source mixture undergoes primary denitrification and denitrification treatment. After the denitrification and denitrification treatment, the nitrogenous wastewater and carbon source mixture continues to flow evenly upward through the upper grid plate 82 into the fluidized reaction zone 23, where it contacts the denitrifying granular sludge for secondary denitrification. Denitrification treatment fully removes nitrogen from nitrogen-containing wastewater. After two stages of denitrification and denitrification, the nitrogen content in the wastewater is reduced to the discharge standard. The water continues to flow upward. As the water flows upward through the fluidized reaction zone 23, it passes through the deaerator 3. The deaerator 3 can vent the nitrogen-containing sludge clumps in the water flow. The vented nitrogen continues to flow upward and is eventually discharged from the upper opening of the reactor shell 2. The sludge that has lost nitrogen is discharged from the lower outlet of the deaerator 3 under its own weight and sinks back into the fluidized reaction zone 23 to continue participating in the denitrification reaction. Finally, the denitrified water enters the effluent zone 25 and is discharged along the outlet 5 on the side wall of the effluent zone 25. It can be discharged or further treated as needed.

[0027] The reactor described above forms a denitrification reaction zone 23 and a fluidized reaction zone 23 from bottom to top, realizing a two-stage denitrification and denitrification reaction for nitrogen-containing wastewater. This can fully treat nitrogen-containing wastewater, ensuring that the nitrogen content of the effluent is consistently lower than the discharge standard. During the reaction, denitrifying bacteria can rapidly multiply in the denitrification reaction zone 23. The multiplied denitrifying bacteria enter the fluidized reaction zone 23 with the water flow, and can also provide inoculum for the denitrifying granular sludge in the fluidized reaction zone 23. This avoids the loss of biomass due to the normal aging and disintegration of granular sludge in the fluidized reaction zone 23, thus ensuring that the biomass of denitrifying bacteria in the fluidized reaction zone 23 is maintained stably for a long time, thereby improving the denitrification and denitrification treatment load level of the fluidized reaction zone 23.

[0028] The degasser 3 installed at the upper end of the fluidized reaction zone 23 can remove nitrogen from the sludge clumps coated with nitrogen in the water flow, allowing the granular sludge to return to the fluidized zone under its own weight. This effectively solves the problem of granular sludge floating and being lost in the fluidized bed, and also improves the cleanliness of the effluent.

[0029] The reactor shell 2 is also provided with a return water connection port 24 on the side wall of the water outlet zone 25. The height of the return water connection port 24 is lower than that of the water outlet 5. The return water connection port 24 is connected to the material distributor 1 through the return water pipe 4 to supply part of the denitrification treatment water of the water outlet zone 25 to return to the material distributor 1 and mix with the nitrogen-containing wastewater and carbon source.

[0030] Nitrogen-containing wastewater, carbon source, and return water are mixed in the material distributor 1, which can reduce the nitrogen content in the influent, improve the denitrification treatment capacity, and ensure that the nitrogen content in the effluent is effectively controlled below the discharge standard.

[0031] The material distributor 1 includes a main material distribution pipe 11, a branch material distribution pipe 12, and a square four-way connector 13. The reactor shell 2 has an inlet on its lower side wall. The main material distribution pipe 11 is sealed and inserted into the inlet. One end of the main material distribution pipe 11 located outside the reactor shell 2 is connected to the nitrogen-containing wastewater, the carbon source supply device, and the return water pipe 4. The other end of the main material distribution pipe 11 located inside the reactor shell 2 is connected to the feed inlet at the top of the square four-way connector 13. One end of each branch material distribution pipe 12 is connected to the discharge outlet on each side of the square four-way connector 13. The other end of each branch material distribution pipe 12 forms a material spray outlet.

[0032] Nitrogen-containing wastewater, carbon source, and return water enter the main pipe 1111 of the material distributor, and are evenly distributed to the branch pipes 1212 of the material distributor via the square four-way valve 1313. Finally, they enter the feed area of ​​the reactor shell 22, achieving uniform mixing and dispersion of the three materials. The square four-way valve 13 of the material distributor 1 can also be replaced with a cylinder, with the material distribution branch pipes 12 evenly spaced on its outer circumference surface, or the square four-way valve 13 can be designed as a disc structure with the material distribution branch pipes 12 evenly arranged on its lower side. All of the above can achieve uniform water distribution and are within the protection scope of this invention.

[0033] The main pipe 11 of the material distributor is a horizontal cylindrical pipe. The bottom surface of the square four-way valve 13 is parallel to the bottom surface of the reactor shell 2, and the square four-way valve 13 is located at the radial center of the feeding area. The material outlet of the branch pipe 12 of the material distributor can spray material vertically downwards. The distance between the material outlet of the branch pipe 12 and the bottom surface of the reactor shell 2 is 5-10cm. The branch pipe 12 of the material distributor forms an L-shaped structure. After the material is sprayed downwards, it first flows from top to bottom and impacts the bottom surface of the reactor shell 2 before reflecting upwards. This can further improve the mixing uniformity of the three materials and prevent the three materials from flowing upwards without being uniformly mixed.

[0034] A cylindrical shell 81 is sealed and embedded inside the reactor shell 2. An upper grid plate 82 and a lower grid plate 83 are fixedly installed over the openings at the upper and lower ends of the cylindrical shell 81, respectively. The cylindrical shell 81, upper grid plate 82, and lower grid plate 83 together form a fixed bed 8. The packing material is filled into the fixed bed 8. The upper grid plate 82 and lower grid plate 83 have square grid strips arranged at equal intervals inside, and the lower grid plate 83 is horizontally tangent to the outer diameter of the material distributor main pipe 11. Volcanic rock packing is preferred. During assembly, the packing material is first filled into the fixed bed 8, and then the fixed bed 8 is fixedly installed inside the reactor shell 2 through a sealed embedding method. This facilitates the filling of the packing material and the installation of the fixed bed 8, and also allows for overall replacement and maintenance. Alternatively, the upper grid plate 82 and lower grid plate 83 can be directly fixedly embedded into the inner wall of the reactor shell 2. This is an equivalent replacement structure easily conceived by those skilled in the art based on this patent and also falls within the scope of protection of this patent.

[0035] The reactor shell 2 has several monitoring connection ports 27 arranged at intervals from bottom to top on the side wall of the fluidized reaction zone 23. A monitoring tube 7 is sealed to the monitoring connection port. The monitoring port 7 is provided with a monitoring port. The denitrifying granular sludge in the fluidized reaction zone 23 can flow out of the reactor through the monitoring port 7 for bacterial activity monitoring. The monitoring port 7 is also provided with a control valve that can open or close it.

[0036] Granular sludge at different heights within the fluidized zone can flow out of the reactor through monitoring port 7 for bacterial activity monitoring. This allows for timely detection of insufficient bacterial activity in the denitrifying granular sludge of the fluidized reaction zone 23, facilitating timely replenishment of bacteria by staff. Ideally, multiple monitoring pipes 7 should be installed, such as at the lower, upper, and middle ends of the fluidized reaction zone 23. Monitoring pipes 7 can also be installed at the upper end of the deaerator 3 to ensure that the nitrogen-encapsulated sludge clumps have undergone sufficient deaeration.

[0037] The degasser 3 includes a cyclone feed pipe 31, a cylindrical cyclone shell 32, and a conical cyclone shell 33. The conical cyclone shell 33 is a conical cylindrical structure with an upper inner diameter larger than the lower inner diameter. The lower end of the cylindrical cyclone shell 32 and the upper end of the conical cyclone shell 33 are sealed together. The cyclone feed pipe 31 and the cylindrical cyclone shell 32 are horizontally spun together. The lower conical opening of the conical cyclone shell 33 is connected to the fluidized reaction zone 23 of the reactor. The bottom monitoring port 7 of the fluidized reaction zone 23 is connected to the cyclone feed pipe 31 through a sludge discharge pipe. The denitrified granular sludge in the bottom monitoring port 7 of the fluidized reaction zone 23 can be pumped from the sludge discharge pipe to the cyclone feed pipe 31. Large particles of denitrified granular sludge are discharged from the lower conical opening of the conical cyclone shell 33 through the cyclone. The nitrogen gas attached to the denitrified granular sludge overflows from the upper end of the cylindrical cyclone shell 32. After the nitrogen gas generated by the denitrification reaction in the denitrification reaction zone 23 enters the fluidized zone, it comes into contact with the granular sludge at the bottom of the fluidized zone and is easily encapsulated by the sludge to form aerobic sludge clumps. The sludge-water mixture located at the lower end of the fluidized zone enters the columnar cyclone shell 32 and the conical cyclone shell 33 through the cyclone feed pipe 31. The high-speed cyclone fully degasses the granular sludge, preventing the granular sludge from floating due to the attached nitrogen gas and failing to fluidize properly. The degassed sludge, because its density is greater than that of water, is discharged along the lower cone opening at the bottom of the conical cyclone shell 33 and deposits downwards. The nitrogen gas, because its density is lower, floats up and is discharged along the reactor shell 2. This can prevent the nitrogen gas from the denitrification zone from entering the fluidized zone and combining with the granular sludge, causing the sludge in the fluidized zone to float up and be lost.

[0038] In addition to using the cyclone degassing method, the degasser 3 can also use other degassing methods, all of which are within the scope of protection of this patent.

[0039] The outer diameter of the cylindrical swirl shell 32 of the degasser 3 is smaller than the inner diameter of the fluidized reaction zone 23 of the reactor shell 2, and the cylindrical swirl shell 32 and the fluidized reaction zone 23 of the reactor shell 2 are concentrically arranged. The swirl feed pipe 31 passes through the side wall of the fluidized reaction zone 23 of the reactor shell 2 and extends to the outside of the reactor shell 2. The top of the cylindrical swirl shell 32 is located between the two uppermost monitoring ports 7 on the side wall of the reactor shell 2.

[0040] The reactor shell 2 is provided with a base 21 for fixed installation on the ground at the lower end. The bottom surface of the reactor shell 2 is provided with an exhaust connection port 28, and an exhaust pipe 9 is connected to the exhaust connection port 28. A control valve capable of opening and closing the exhaust pipe 9 is provided inside the exhaust pipe 9. The inner diameter of the feed area and the reaction area 23 of the reactor shell 2 is the same. The inner diameter of the water outlet area 25 is larger than the inner diameter of the reaction area 23, and the lower end of the water outlet area 25 is connected to the upper end of the reaction area 23 through a conical transition.

[0041] The increased inner diameter of the effluent zone 25 reduces the flow velocity of the water, which is conducive to the settling of particulate sludge in the water and reduces the sludge content in the effluent. The settled sludge automatically slides down the conical surface into the fluidization reaction zone 23, preventing sludge from accumulating in the effluent zone 25.

[0042] Two layers of inclined plates 6 are fixedly installed in the effluent zone 25 of the reactor shell 2. The two layers of inclined plates 6 are symmetrically arranged along the horizontal plane, forming a V-shaped water flow channel between the upper and lower inclined surfaces. The height of the two layers of inclined plates 6 is lower than the horizontal height of the return effluent connection port 24. The two layers of inclined plates 6 form a V-shaped bend, and the water flows along the V-shaped water flow channel. The effluent after filtering sludge can pass through the inclined plates 6 upwards. The sludge particles collide with the inclined surfaces and are deposited downwards, achieving full interception of particulate sludge from the fluidization zone. The inclined plate 6 can be composed of an inclined plate 6 fixing ring 61 and an inclined plate 6 body 62. Several inclined plate 6 bodies are evenly spaced and fixedly installed on the inner side of the inclined plate 6 fixing ring. The half-fixing ring is used to seal and embed in the inner wall of the effluent zone 25 of the reactor shell 2.

Claims

1. A high-load denitrification tower reactor, comprising a reactor shell (2), wherein a feed zone, a reaction zone (23), and an outlet zone (25) are sequentially formed from bottom to top within the reactor shell, and an outlet (5) for discharging denitrified water is provided on the side wall of the outlet zone, characterized in that: It also includes a material distributor (1), a degasser (3), an upper grid plate (82), and a lower grid plate (83). The material distributor is fixedly installed on the lower side wall of the reactor shell. Nitrogenous wastewater and carbon source can enter the feed zone of the reactor shell through the material distributor. The lower grid plate and the upper grid plate are fixedly installed on the inner side wall of the reactor shell from bottom to top. The lower grid plate is located at the junction of the feed zone and the reaction zone. The lower grid plate can disperse the nitrogenous wastewater and carbon source in the effluent of the material distributor upwards. The reaction zone between the upper and lower grid plates inside the reactor shell forms a denitrification reaction zone, and the reaction zone above the upper grid plate inside the reactor shell forms a fluidized reaction zone. The denitrification reaction zone is filled with packing material with a particle size larger than the grid aperture of the upper and lower grid plates. The packing material is enriched with denitrifying bacteria. The fluidized reaction zone is filled with denitrifying granular sludge. A deaerator is fixedly installed in the upper part of the fluidized reaction zone. The deaerator can separate sludge and gas in the water flow from the fluidized reaction zone toward the effluent zone.

2. The high-load denitrification tower reactor according to claim 1, characterized in that: The reactor shell is also provided with a reflux outlet (24) on the side wall of the outlet area. The height of the reflux outlet is lower than that of the outlet. The reflux outlet is connected to the material distributor through the reflux water pipe (4) to supply part of the denitrification treatment water in the outlet area to the material distributor to mix with nitrogen-containing wastewater and carbon source.

3. The high-load denitrification tower reactor according to claim 2, characterized in that: The material distributor (1) includes a material distribution main pipe (11), a material distribution branch pipe (12), and a square four-way connector (13). The lower side wall of the reactor shell is provided with a water inlet. The material distribution main pipe is sealed and inserted into the water inlet. One end of the material distribution main pipe located outside the reactor shell is connected to the nitrogen-containing wastewater, the carbon source supply device, and the return water pipe. One end of the material distribution main pipe located inside the reactor shell is connected to the feed inlet at the top of the square four-way connector. One end of each material distributor branch pipe is connected to the discharge outlet on each side of the square four-way connector. The other end of each material distributor branch pipe forms a material spray outlet.

4. The high-load denitrification tower reactor according to claim 3, characterized in that: The main pipe (11) of the material distributor is a horizontal column-shaped pipe. The bottom surface of the square four-way (13) is parallel to the bottom surface of the reactor shell, and the square four-way is located at the radial center of the feeding area. The material outlet of the material distributor branch pipe (12) can spray material vertically downward. The distance between the material outlet of the material distributor branch pipe (12) and the bottom surface of the reactor shell is 5-10cm.

5. The high-load denitrification tower reactor according to claim 3, characterized in that: A cylindrical shell (81) is installed inside the reactor shell. The upper grid plate (82) and the lower grid plate (83) are fixedly covered on the openings at the upper and lower ends of the cylindrical shell, respectively. The cylindrical shell, the upper grid plate and the lower grid plate together form a fixed bed (8). The packing fills the fixed bed. The upper grid plate and the lower grid plate are filled with square grid strips arranged at equal intervals. The lower grid plate is horizontally tangent to the outer diameter of the main pipe of the material distributor.

6. The high-load denitrification tower reactor according to claim 1, characterized in that: The reactor shell has several monitoring ports (27) arranged at intervals from bottom to top on the side wall of the fluidized reaction zone. A monitoring tube (7) is sealed to the monitoring port. The monitoring tube is equipped with a monitoring port. The denitrifying granular sludge in the fluidized reaction zone can flow out of the reactor through the monitoring port for bacterial activity monitoring. The monitoring port is also equipped with a control valve that can open or close it.

7. The high-load denitrification tower reactor according to claim 6, characterized in that: The degasser (3) includes a cyclone feed pipe (31), a cylindrical cyclone shell (32), and a conical cyclone shell (33). The conical cyclone shell is a conical cylindrical structure with an upper inner diameter larger than the lower inner diameter. The lower end of the cylindrical cyclone shell and the upper end of the conical cyclone shell are sealed together. The cyclone feed pipe (31) and the cylindrical cyclone shell are horizontally spun together. The lower cone of the conical cyclone shell is connected to the fluidized reaction zone of the reactor. The bottom monitoring port of the fluidized reaction zone is connected to the cyclone feed pipe through a sludge discharge pipe. The denitrified granular sludge in the bottom monitoring port of the fluidized reaction zone can be pumped from the sludge discharge pipe to the cyclone feed pipe (31). Large denitrified granular sludge particles are discharged from the lower cone of the conical cyclone shell through the cyclone. The nitrogen gas attached to the denitrified granular sludge overflows from the upper end of the cylindrical cyclone shell (32).

8. The high-load denitrification tower reactor according to claim 7, characterized in that: The outer diameter of the cylindrical swirl shell (32) of the degasser (3) is smaller than the inner diameter of the fluidized reaction zone of the reactor shell (2), and the cylindrical swirl shell (32) and the fluidized reaction zone of the reactor shell (2) are concentrically arranged. The swirl feed pipe (31) passes through the side wall of the fluidized reaction zone of the reactor shell (2) and extends to the outside of the reactor shell. The top of the cylindrical swirl shell (32) is located between the two uppermost monitoring ports (7) on the side wall of the reactor shell.

9. The high-load denitrification tower reactor according to claim 2, characterized in that: The reactor shell is provided with a base (21) for fixed installation on the ground at the lower end. The bottom surface of the reactor shell is provided with an air vent (28). An air vent pipe (9) is connected to the air vent. A control valve that can open and close the air vent pipe is provided inside the air vent pipe. The feed zone and the reaction zone of the reactor shell have the same inner diameter. The water outlet zone has a larger inner diameter than the reaction zone. The lower end of the water outlet zone is connected to the upper end of the reaction zone through a conical transition.

10. The high-load denitrification tower reactor according to claim 9, characterized in that: The reactor shell has two layers of inclined plates (6) fixedly installed in the water outlet area. The two layers of inclined plates are symmetrically arranged along the horizontal plane, and a V-shaped water flow channel is formed between the upper and lower inclined surfaces. The height of the two layers of inclined plates is lower than the horizontal height of the return water outlet (24).

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