Nitrate nitrogen wastewater treatment device

Abstract

The present application provides a nitrate-nitrogen wastewater treatment device, comprising: a mixing tank, a water distributor, a circulation pump and a denitrification chamber; the mixing tank is provided with an inlet, a filter port and an outlet; the inlet is for wastewater to flow into the mixing tank for mixing to obtain a mixed liquid; the denitrification chamber is provided with a fluidizing zone, a separation zone and a reflux zone from bottom to top; the fluidizing zone is filled with fillers attached with microbial membranes, so that the mixed liquid and the microbial membranes undergo denitrification reaction to obtain a denitrified liquid; the bottom of the fluidizing zone is connected to the outlet via a water distributor and a circulation pump; the separation zone is for the fillers to separate and settle from the denitrified liquid to the fluidizing zone; the reflux zone is provided with a drain port for discharging the denitrified liquid, and the reflux zone is connected to the filter port to transport the denitrified liquid into the mixing tank. The present application effectively improves the shock load resistance of the nitrate-nitrogen wastewater treatment device during denitrification, reliably avoids the loss of bacterial species, improves the denitrification treatment effect, and the denitrification treatment device has a simple structure.

Description

Technical Field

[0001] The present application relates to the technical field of nitrate nitrogen wastewater treatment devices, and in particular to a nitrate nitrogen wastewater treatment device. Background Art

[0002] Nitrate in water is the most stable nitrogen compound among various forms of nitrogen-containing organic matter such as nitrite nitrogen and ammonia nitrogen in an aerobic environment. It is also the final decomposition product of nitrogen-containing organic matter after inorganic reaction. If nitrate in water is ingested by the human body, it will be transformed into nitrite by microorganisms in the intestine and become toxic, posing a serious threat to human health. Therefore, it is particularly necessary to treat nitrate nitrogen wastewater containing a large amount of nitrate nitrogen to meet the discharge standards.

[0003] Tannery wastewater and pickling wastewater can contain a large amount of nitrates. In the past, alkali neutralization was used to treat them, but this treatment method did not effectively treat the nitrate nitrogen in the wastewater and could not fundamentally solve the problem of excessive nitrate nitrogen content in the wastewater. Summary of the invention

[0004] The purpose of this application is to provide a nitric nitrogen wastewater treatment device to solve the problems in the prior art that the biochemical denitrification has poor shock load resistance, inevitably leads to the loss of bacteria during the treatment process, has poor denitrification treatment effect, and occupies a large area of ​​the denitrification treatment device.

[0005] In order to solve the above technical problems, the present application adopts the following technical solutions: a nitric nitrogen wastewater treatment device, which includes a mixing tank, a water distributor, a circulation pump and a denitrification chamber; the mixing tank is provided with an inlet, a filter port and an outlet; the inlet is for wastewater to flow into the mixing tank for mixing to obtain a mixed liquid; the denitrification chamber is provided with a fluidizing zone, a separation zone and a reflux zone from bottom to top; the fluidizing zone is filled with fillers with attached microbial membranes so that the mixed liquid and the microbial membranes can undergo denitrification reaction to obtain a denitrified liquid; the bottom of the fluidizing zone is connected to the outlet via the water distributor and the circulation pump; the separation zone is for the fillers to be separated from the denitrified liquid and settled in the fluidizing zone; the reflux zone is provided with a drain port for discharging the denitrified liquid to the outside, and the reflux zone is connected to the filter port to transport the denitrified liquid into the mixing tank.

[0006] Optionally, the water distributor is arranged at the bottom of the fluidizing zone, and the outlet of the water distributor is arranged upward; the mixing tank is arranged in the recirculation zone, and the filter port is opened on the tank wall of the mixing tank, so that the filter port is connected to the recirculation zone; the circulation pump is arranged outside the denitrification chamber; the output port is connected to the inlet of the circulation pump through a first delivery pipe, and the outlet of the circulation pump is connected to the inlet of the water distributor through a second delivery pipe.

[0007] Optionally, the first delivery pipeline is composed of alternately arranged first pipelines and second pipelines, and the diameter of the second pipeline is larger than the diameter of the first pipeline, so that the second pipeline forms a mixer for the mixed liquid when the mixed liquid flows through.

[0008] Optionally, the cross-section of the separation zone is larger than the cross-section of the fluidization zone.

[0009] Optionally, the separation zone has a trumpet-like profile with its opening facing upward.

[0010] Optionally, the cavity of the mixing tank is divided into a water collecting tank and a mixing tank by a vertically arranged partition plate; a connecting hole is provided on the partition plate; the inlet is provided on the upper end surface of the mixing tank, and the outlet is provided on the lower end surface of the mixing tank; the filter port is provided on the side wall of the water collecting tank facing the reflux zone.

[0011] Optionally, an overflow weir is provided in the recirculation zone, the height of the overflow weir is higher than the height of the filter port, and a groove opening upward is formed between the overflow weir and the shell of the denitrification chamber; the drain outlet is opened on the shell of the denitrification chamber located in the groove.

[0012] Optionally, a water distribution plate is further provided in the denitrification chamber, through which the fluidization zone is isolated from the area below the water distribution plate; the water distributor is arranged above the water distribution plate, the water distributor outlet is located above the water distribution plate, and the water distributor inlet is located below the water distribution plate.

[0013] Optionally, the filter port is connected to the mixing tank via a water collecting pipe, and a filter hole is opened on the side wall of the water collecting pipe, and the aperture of the filter hole is smaller than the diameter of the filler.

[0014] Optionally, the water collecting pipe is arranged transversely in the recirculation zone.

[0015] It can be seen from the above technical scheme that the present application has at least the following advantages and positive effects: the nitrate nitrogen wastewater treatment device of the present application includes a mixing tank, a water distributor, a circulation pump and a denitrification chamber; the mixing tank is provided with an inlet, a filter port and an outlet; the wastewater can be supplied to flow into the mixing tank through the inlet to mix and obtain a mixed liquid, and the wastewater is further circulated. At the same time, a fluidization zone, a separation zone and a reflux zone are set up from bottom to top in the denitrification chamber; the fluidization zone is filled with fillers attached to microbial membranes, so that the mixed liquid and the microbial membranes can undergo denitrification reaction to obtain a denitrified liquid; the bottom of the fluidization zone is connected to the outlet through a water distributor and a circulation pump; the separation zone is for the fillers to separate and settle from the denitrified liquid to the fluidization zone. The bottom of the fluidization zone is connected to the outlet through a water distributor and a circulation pump, and the reflux zone is connected to the filter port of the mixing tank to transport the denitrified liquid into the mixing tank to form a reflux circulation loop; secondly, the reflux zone is provided with a drain port to form a drainage passage parallel to the reflux loop.

[0016] Driven by the circulation pump, the mixed liquid in the mixing tank can be distributed into the fluidizing zone from the bottom by the water distributor, driving the filler attached to the microbial film to move in a fluidized state from bottom to top. Denitrification is carried out by microbial membrane denitrification in the fluidizing zone to obtain denitrified liquid. The filler in the separation zone is separated from the denitrified liquid and settled in the fluidizing zone. The denitrified liquid enters the reflux zone. In the reflux zone, part of the denitrified liquid enters the mixing tank through the filter port for reflux mixing, and part of the denitrified liquid is discharged through the drain port.

[0017] In this way, during the denitrification treatment of wastewater, the reflux circulation loop is parallel to the drainage passage, and the reflux loop forms an internal circulation loop. The denitrification of the wastewater can be carried out through the filler attached with microbial film in the fluidized area. The filler will be filtered when moving from top to bottom. The whole treatment process has strong resistance to shock loads, and the structural design can effectively prevent the loss of bacteria, making denitrification more thorough, and effectively improving the efficiency and effect of denitrification treatment. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a structural schematic diagram of an embodiment of a nitric nitrogen wastewater treatment device of the present application.

[0019] The following are the descriptions of the reference numerals:

[0020] 1. Nitrate-nitrogen wastewater treatment device; 11. Mixing tank; 111. Inlet; 112. Filter port; 113. Output port; 114. First delivery pipeline; 1141. First pipeline; 1142. Second pipeline; 115. Partition plate; 116. Water collecting tank; 117. Mixing tank; 12. Water distributor; 121. Water distributor outlet; 122. Water distributor inlet; 13. Circulation pump; 131. Second delivery pipeline; 14. Denitrification chamber; 141. Fluidizing zone; 142. Separation zone; 1421. Transition section; 143. Reflux zone; 15. Drainage outlet; 16. Overflow weir; 17. Water collecting pipe; 18. Water distribution plate. DETAILED DESCRIPTION

[0021] Typical implementations that embody the features and advantages of the present application will be described in detail in the following description. It should be understood that the present application can have various changes in different implementations without departing from the scope of the present application, and the descriptions and illustrations therein are essentially used for illustrative purposes rather than for limiting the present application.

[0022] See also Figure 1 According to an embodiment of the present application, the nitrate nitrogen wastewater treatment device 1 is used to perform denitrification treatment on wastewater to obtain denitrified liquid for discharge. The nitrate nitrogen wastewater treatment device 1 includes:

[0023] The nitrate nitrogen wastewater treatment device 1 includes a mixing tank 11, a water distributor 12, a circulating pump 13 and a denitrification chamber 14. The mixing tank 11 is used to mix the received wastewater with the denitrification liquid obtained by denitrification in the denitrification chamber 14 to obtain a mixed liquid, and the denitrification liquid can be used to dilute the wastewater to a certain extent. The circulating pump 13 is used to provide power for the flow of the mixed liquid. The water distributor 12 is used to distribute the mixed liquid into the denitrification chamber 14. The denitrification chamber 14 is used to carry out a denitrification reaction between the filler with a microbial film (denitrifying bacteria) attached to the surface and the mixed liquid, denitrify the mixed liquid to obtain a denitrification liquid (that is, wastewater with nitrate nitrogen removed that can be discharged), and send part of the denitrification liquid into the mixing tank 11, and discharge part of the denitrification liquid. Among them, when the wastewater is sent to the mixing tank 11, the nutrient elements and pH adjustment agents of the denitrifying bacteria are added in advance.

[0024] The mixing tank 11 is provided with an inlet 111 , a filter port 112 and an outlet 113 . The inlet 111 is used for the wastewater to be denitrified to flow into the mixing tank 11 and mix with the denitrified liquid entering from the filter port 112 to obtain a mixed liquid.

[0025] The denitrification chamber 14 is provided with a fluidized zone 141, a separation zone 142 and a recirculation zone 143 from bottom to top. The fluidized zone 141 is filled with fillers attached with microbial membranes, so that the mixed liquid and the microbial membranes undergo denitrification reaction to denitrify and obtain denitrified liquid, wherein the fillers are set to have a high specific surface area and a high specific gravity. The separation zone 142 is used for the fillers to separate and settle from the denitrified liquid to the fluidized zone. The recirculation zone 143 is used for the discharge of the denitrified liquid and the recirculation of the denitrified liquid into the mixing tank 11 for reflux mixing.

[0026] The bottom of the fluidized zone 141 is connected to the output port 113 on the mixing tank 11 through the water distributor 12 and the circulation pump 13, and the reflux zone 143 is connected to the filter port 112 of the mixing tank 11 to transport the denitrification liquid into the mixing tank 11. Then, driven by the circulation pump 13, the mixed liquid in the mixing tank 11 is distributed from the bottom to the fluidized zone by the water distributor 12, driving the filler attached to the microbial membrane to move in a fluidized state from bottom to top. In the fluidized zone 141, the mixed liquid is denitrified by the microbial membrane to obtain the denitrification liquid, which is separated from the denitrification liquid by the filler in the separation zone and settled in the fluidized zone. The denitrification liquid enters the reflux zone, and part of the denitrification liquid in the reflux zone enters the mixing tank through the filter port for reflux mixing to form a reflux circulation loop.

[0027] Secondly, the reflux zone 143 is provided with a drain port 15, so that the mixed liquid in the mixing tank 11 is distributed from the bottom into the fluidized zone by the water distributor 12 to drive the filler attached to the microbial membrane to move from bottom to top. In the fluidized zone, the mixed liquid undergoes denitrification by microbial membrane denitrification (the mixed liquid undergoes denitrification reaction with the microbial membrane) to obtain a denitrified liquid, which enters the reflux zone 143 after sedimentation and filtration of the filler in the separation zone 142. Part of the denitrified liquid is discharged through the drain port 15 to form a discharge passage.

[0028] In this way, during the denitrification treatment of the filtrate, a reflux circulation loop is formed in parallel with the drainage passage, and the reflux loop forms an internal circulation loop. In the fluidized area, the filtrate can be denitrified by the filler attached with the microbial film. The filler will be filtered when it moves from top to bottom. The whole treatment process has strong resistance to shock loads, and the structural design can effectively prevent the loss of bacteria. The denitrification is more thorough, which effectively improves the denitrification treatment efficiency and effect, thereby effectively improving the overall treatment efficiency and treatment effect of the pickling wastewater.

[0029] In the implementation of this example, reference Figure 1 As shown, the water distributor 12 is arranged in the denitrification chamber 14 at the bottom of the fluidizing zone 141, and the water distributor outlet 121 is arranged upward, so that the mixed liquid is directly distributed upward from the water distributor outlet 121; the mixing tank 11 is arranged in the reflux zone 143, and the filter port 112 on the mixing tank 11 is opened on the tank wall of the mixing tank 11, so that the filter port 112 is connected to the reflux zone 143; the circulation pump 13 is arranged outside the denitrification chamber 14; the output port 113 on the mixing tank 11 is connected to the inlet of the circulation pump 13 through the first delivery pipe 114, and the outlet of the circulation pump 13 is connected to the water distributor inlet 122 through the second delivery pipe 131.

[0030] It can be understood that in other examples, the water distributor 12 is arranged outside the denitrification chamber 14, but the water distributor outlet 121 extends into the bottom of the fluidization zone 141; the mixing tank 11 is arranged outside the denitrification chamber 14, but its filter port 112 is connected to the recirculation zone 143 through a pipeline.

[0031] Specifically, the cavity of the mixing tank 11 is divided into a sump 116 and a mixing tank 117 by a vertically arranged partition plate 115; a communication hole is provided on the partition plate 115 to connect the sump 116 and the mixing tank 117; at the same time, the inlet 111 of the mixing tank 11 is opened on the upper end surface of the mixing tank (which is also the upper end surface of the denitrification chamber 14), and the outlet 113 of the mixing tank 11 is opened on the lower end surface of the mixing tank 117; the filter port 112 of the mixing tank 11 is opened on the side wall of the sump 116 facing the reflux zone 143. Thus, the denitrified liquid in the reflux zone 143 can enter the sump 116 through the filter port 112, and then enter the mixing tank 117 through the communication hole provided on the partition plate 115, and be mixed with the filtrate flowing in from the inlet 111 in the mixing tank 117.

[0032] Furthermore, the filter port 112 is connected to the mixing tank 117 through a collecting pipe 17. Filter holes are provided on the side wall of the collecting pipe 17, and the aperture of the filter holes is smaller than the diameter of the packing, so as to further filter the packing and prevent the packing from entering the mixing tank.

[0033] Furthermore, the collecting pipe 17 is horizontally arranged in the reflux zone, so that when the water flows upward, the denitrified liquid can be widely collected into the sump through the filter holes on the side wall, ensuring the collection effect.

[0034] In the embodiment of this example, the cavity of the mixing tank 11 is in the shape of a cylinder with its axis vertically established; the cavity of the mixing tank 11 is divided into a mixing tank 117 located at the center of the cavity of the mixing tank 11 and a sump 116 surrounding the mixing tank 117 by a vertically arranged annular partition plate 115; a communication hole is provided on the partition plate 115 to connect the sump 116 and the mixing tank 117, and the water in the sump 116 can overflow into the middle mixing tank 117; at the same time, the filter port 112 is opened on the shell of the mixing tank 11, that is, the filter port 112 is opened on the side wall of the sump 116 in contact with the reflux zone 143, and there are multiple filter ports 112, which are arranged in an array around the mixing tank 11. Each filter port 112 is connected to a collecting pipe 17, and the collecting pipe 17 is horizontally arranged.

[0035] Furthermore, the cross section of the separation zone 142 is larger than the cross section of the fluidizing zone 141. When the denitrification liquid drives the filler into the separation zone 142, the liquid rising velocity will decrease due to the expansion of the cross section (diameter) of the separation zone 142. Under the action of gravity, the carried filler will settle back to the fluidizing zone to continue to participate in the denitrification reaction. In the embodiment of this example, the profile of the separation zone 142 is trumpet-shaped and the opening is upward, so that the shell part of the denitrification chamber in the separation zone 142 section has a transition section 1421 that extends smoothly to the fluidizing zone 141. Starting from the fluidizing zone, the cross section of the separation zone 142 gradually expands from bottom to top, and then the filler will smoothly fall to the fluidizing zone 141 along the transition section 1421 when it hits the shell during sedimentation. In this example, the transition section 1421 is in the shape of a straight plate. It can be understood that in other examples, the transition section 1421 may also have a certain curvature.

[0036] Furthermore, an overflow weir 16 is provided in the reflux zone 143, the height of the overflow weir 16 is higher than the height of the filter port 112, and a groove with an opening upward is formed between the overflow weir 16 and the shell of the denitrification chamber 14; the drain port 15 is provided on the shell of the denitrification chamber located in the groove. Furthermore, the denitrification liquid first passes through the filter port 112 and enters the mixing tank 11 before rising to the overflow weir 16, overflows the overflow weir 16, enters the groove, and flows out through the drain port 15, ensuring that the denitrification liquid can be discharged while refluxed.

[0037] Further, the first delivery pipeline 114 connecting the output port 113 and the inlet of the circulation pump 13 is composed of a first pipeline 1141 and a second pipeline 1142 which are alternately arranged, and the diameter of the second pipeline 1142 is larger than the diameter of the first pipeline 1141, so that the second pipeline 1142 forms a mixer of the mixed liquid when the mixed liquid flows through, that is, due to the different diameters of the first pipeline 1141 and the second pipeline 1142, when the mixed liquid preliminarily mixed in the mixing tank 11 flows into the second pipeline 1142 through the pipeline, due to the expansion of the flow channel, the mixed liquid flows under the reverse pressure gradient and generates a vortex, which promotes the deep mixing of the mixed liquid. In the embodiment of this example, the number of the second pipelines 1142 is 3, and it can be understood that the number of the second pipelines 1142 can be set according to demand, such as 1 or 5.

[0038] Furthermore, a water distribution plate 18 is also provided in the denitrification chamber 14, through which the fluidization zone 141 is isolated from the area below the water distribution plate 18; at the same time, the water distributor 12 is arranged above the water distribution plate 18, and the water distributor outlet 121 is located above the water distribution plate 18, and the water distributor inlet 122 is located below the water distribution plate, and further, the second delivery pipeline connecting the circulation pump and the water distributor inlet 122 is located in the area below the water distribution plate 18, which can avoid corrosion by the filtrate and ensure the reliability of the device.

[0039] Continue reading Figure 1As shown, the process flow of one embodiment of the nitric nitrogen wastewater treatment device according to the present application is as follows:

[0040] A nitrate nitrogen wastewater treatment device 1 is provided, and a circulating pump 13 is provided for internal circulation reflux to increase the load of the nitrate nitrogen wastewater treatment device 1; the filtrate to which carbon source and nitrogen and phosphorus nutrient elements are added flows into the mixing tank 117 from the inlet 111, and after mixing with the denitrification liquid overflowing from the water collection tank 116 through the connecting hole on the partition plate 115, it flows into the mixer formed by the second pipe 1142 through the first pipe 1141 at the bottom of the mixing tank 117. Since the diameter of the mixer formed by the second pipe 1142 is different from that of the first pipe 1141, when the mixed liquid flows into the second pipe 1142 through the first pipe 1141, the flow channel expands, and the mixed liquid flows under the reverse pressure gradient to generate a vortex, which promotes further mixing of the liquid. After the mixed liquid is evenly mixed through the multiple sections of the second pipe 1142, it is pumped into the second delivery pipe 131 through the circulating pump, and flows into the denitrification chamber through the outlet of the water distributor 121 connected to the second delivery pipe 131. By controlling the water flow rate, the fillers in the fluidized zone 141 move in a fluidized state, and the mixed flow passes through the fluidized zone 141 and fully contacts and reacts with the microbial film attached to the surface of the fillers. The denitrified liquid after the reaction enters the separation zone 142. Since the cross-section of the separation zone 142 is enlarged, the rising flow rate of the wastewater will be reduced. Under the action of gravity, the carried fillers will fall back to the fluidized zone 141 to continue to participate in the reaction, and then the denitrified liquid enters the reflux zone 143. Part of the denitrified liquid is collected into the water collection tank 116 through the water collection pipe 17. The unsettled fillers will be isolated outside the water collection pipe 17 at this time. The denitrified liquid in the water collection tank 116 overflows into the mixing tank 117 through the connecting holes on the partition plate 115, and is mixed with the filtrate for further circulation reaction. The remaining part of the denitrified liquid flows through the overflow weir 16 and is discharged from the drain port 15, and is transported to the discharge point for discharge through the outlet pump.

[0041] This embodiment can be used to treat nitrate nitrogen (NO 3 -N) for effective denitrification treatment, with high denitrification efficiency, strong impact resistance, high volume load and small footprint.

[0042] At the same time, the nitric nitrogen wastewater treatment device can effectively prevent the loss of fillers through optimized structural design, ensure the system's treatment efficiency and long-term stable operation, and maintain the system's denitrification efficiency. At the same time, the fluid is mixed evenly during movement, and there is no need to use traditional mechanical stirring, saving energy. The internal circulation water supply method is adopted, with high nitric nitrogen load and strong impact load resistance. It also has a high volume load, the reactor is tall and thin, and the system occupies a small area.

[0043] It is understandable that the parameters in the above process flow are merely exemplary and can be adjusted according to actual conditions, and this application does not limit this.

[0044] In addition, the above-mentioned drawings are only schematic illustrations of the processes included in the exemplary embodiments of the present application, rather than for limiting purposes. Those skilled in the art will readily conceive of other embodiments of the present application after considering the specification and practicing the application disclosed herein. The present application is intended to cover any variations, uses, or adaptations of the present application, which follow the general principles of the present application and include the common general knowledge or conventional technical means in the technical field not disclosed in the present application. The specification and embodiments are only regarded as exemplary, and the true scope and spirit of the present application are pointed out by the claims.

Claims

1. A nitric nitrogen wastewater treatment device, It is characterized in that It includes a mixing tank, a water distributor, a circulation pump and a denitrification chamber; The mixing tank is provided with an inlet, a filter port and an outlet; the inlet is used for wastewater to flow into the mixing tank for mixing to obtain a mixed liquid; The denitrification chamber is provided with a fluidized zone, a separation zone and a recirculation zone from bottom to top; the fluidized zone is filled with fillers attached with microbial membranes, so that the mixed liquid and the microbial membranes undergo denitrification reaction to denitrify and obtain denitrified liquid; the bottom of the fluidized zone is connected to the output port via the water distributor and the circulation pump; the separation zone is used for the fillers to separate and settle from the denitrified liquid to the fluidized zone; the recirculation zone is provided with a drain port for discharging the denitrified liquid, and the recirculation zone is connected to the filter port to transport the denitrified liquid into the mixing tank; The mixing tank is arranged in the recirculation zone, and the cavity of the mixing tank is a cylindrical shape with an axis vertically arranged; the cavity of the mixing tank is divided into a mixing pool located at the center of the cavity of the mixing tank and a water collecting pool surrounding the mixing pool by a vertically arranged annular partition plate; a connecting hole is opened on the partition plate to connect the water collecting pool with the mixing tank; The inlet of the mixing tank is opened on the upper end surface of the mixing pool, and the outlet of the mixing tank is opened on the lower end surface of the mixing pool; the filter port of the mixing tank is opened on the side wall of the water collection pool facing the recirculation zone, so that the filter port is connected to the recirculation zone; There are multiple filter ports, which are arranged in an array surrounding the mixing tank; each filter port is connected to a water collecting pipe, and the water collecting pipe is connected to the mixing tank through the filter port.

2. The nitric nitrogen wastewater treatment device according to claim 1, It is characterized in that The water distributor is arranged at the bottom of the fluidized zone, and the outlet of the water distributor is arranged upward; the circulation pump is arranged outside the denitrification chamber; the output port is connected with the inlet of the circulation pump through a first delivery pipeline, and the outlet of the circulation pump is connected with the inlet of the water distributor through a second delivery pipeline.

3. The nitric nitrogen wastewater treatment device according to claim 2, It is characterized in that The first delivery pipeline is composed of alternately arranged first pipelines and second pipelines, and the diameter of the second pipeline is larger than the diameter of the first pipeline, so that the second pipeline forms a mixer for the mixed liquid when the mixed liquid flows through.

4. The nitric nitrogen wastewater treatment device according to claim 2, It is characterized in that The cross-section of the separation zone is larger than the cross-section of the fluidization zone.

5. The nitric nitrogen wastewater treatment device according to claim 4, It is characterized in that The profile of the separation zone is in the shape of a trumpet with its opening upward.

6. The nitric nitrogen wastewater treatment device according to claim 1, It is characterized in that An overflow weir is arranged in the recirculation zone, the height of the overflow weir is higher than the height of the filter port, and a groove opening upward is formed between the overflow weir and the shell of the denitrification chamber; the drain port is opened on the shell of the denitrification chamber located in the groove.

7. The nitric nitrogen wastewater treatment device according to claim 1, It is characterized in that A water distribution plate is also provided in the denitrification chamber, through which the fluidization zone is isolated from the area below the water distribution plate; the water distributor is provided on the water distribution plate, the water distributor outlet is located above the water distribution plate, and the water distributor inlet is located below the water distribution plate.

8. The nitric nitrogen wastewater treatment device according to any one of claims 1 to 7, It is characterized in that The side wall of the water collecting pipe is provided with filtering holes, and the aperture of the filtering holes is smaller than the diameter of the filler.

9. The nitric nitrogen wastewater treatment device according to claim 8, It is characterized in that The water collecting pipe is arranged transversely in the recirculation area.

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