Nitrogen-containing wastewater treatment device

Abstract

The utility model discloses a nitrogen-containing wastewater treatment device which comprises a base, a regulating tank is mounted at the top of the base, a UASB anaerobic jar is fixedly mounted outside the regulating tank, an anaerobic tank is mounted outside the UASB anaerobic jar, and an anoxic tank II and an anoxic tank I are respectively mounted at one end, far away from the regulating tank, of the top of the base along the vertical direction; the first anoxic tank is located at the top of the second anoxic tank, the bottom of the first anoxic tank is communicated with the interior of the second anoxic tank through a pipeline, and a first aerobic tank, a second aerobic tank and a third aerobic tank are sequentially installed at the position, located on the side edge of the second anoxic tank, of the top of the base; an ultrafiltration mechanism, a nanofiltration mechanism, a reverse osmosis mechanism, a DTRO system and an MVR system are arranged at the position, located outside the third aerobic tank, of the top of the base. The ultrafiltration element in the ultrafiltration box which stops working can be cleaned, so that the wastewater treatment efficiency is greatly improved.

Description

Technical Field

[0001] The utility model relates to the technical field of wastewater treatment, in particular to a nitrogen-containing wastewater treatment device. Background Art

[0002] At present, there are more and more recycling industrial parks, and the characteristics of various water qualities are different. The denitrification section of the biochemical system is often insufficient in carbon source, and the refluxed nitrification liquid brings a certain amount of oxygen, which makes the denitrification anoxic effect not obvious, resulting in poor denitrification effect; the ultrafiltration in the existing wastewater treatment generally uses a single ultrafiltration box to ultrafilter the wastewater, and the ultrafiltration work needs to be suspended when the ultrafiltration box is cleaned, which reduces the wastewater treatment efficiency; the nanofiltration mechanism in the existing wastewater treatment generally directly sets a layer of nanofiltration membrane in the nanofiltration box, and passes water from the top of the nanofiltration box through a water pipe, so that the wastewater is nanofiltered through the nanofiltration membrane, but after the water flow enters the nanofiltration box, it is generally nanofiltered from one part of the nanofiltration membrane, which makes the nanofiltration membrane easy to be blocked locally. At the same time, the direct water flow impacts the nanofiltration membrane, which is easy to cause the deformation of the nanofiltration membrane, affecting the nanofiltration effect; and the reverse osmosis in the existing wastewater treatment generally directly uses a layer of reverse osmosis membrane to treat the wastewater, and the size of the reverse osmosis membrane is small, which leads to poor reverse osmosis effect after a period of use. For this reason, we propose a nitrogen-containing wastewater treatment device. Utility Model Content

[0003] The purpose of the utility model is to provide a nitrogen-containing wastewater treatment device to solve the problems raised in the above background technology.

[0004] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a nitrogen-containing wastewater treatment device, comprising a base, a regulating tank is installed on the top of the base, and a UASB anaerobic tank is fixedly installed on the outside of the regulating tank, an anaerobic tank is installed on the outside of the UASB anaerobic tank, an anoxic tank 2 and an anoxic tank 1 are respectively installed in the vertical direction at one end of the top of the base away from the regulating tank, and the anoxic tank 1 is located on the top of the anoxic tank 2, and the bottom of the anoxic tank 1 is connected with the inside of the anoxic tank 2 through a pipeline, aerobic tank 1, aerobic tank 2 and aerobic tank 3 are installed in sequence on the side of the anoxic tank 2 on the top of the base, and an ultrafiltration mechanism, a nanofiltration mechanism, a reverse osmosis mechanism, a DTRO system and an MVR system are respectively arranged on the outside of the aerobic tank 3 on the top of the base.

[0005] Preferably, the top of the base is located between the regulating tank and the UASB anaerobic tank, between the UASB anaerobic tank and the anaerobic tank, between the anaerobic tank and the anoxic tank 1, between the anoxic tank 2 and the aerobic tank 1, between the aerobic tank 1 and the aerobic tank 2, between the aerobic tank 2 and the aerobic tank 3, between the aerobic tank 3 and the ultrafiltration mechanism, between the ultrafiltration mechanism and the nanofiltration mechanism, between the nanofiltration mechanism and the reverse osmosis mechanism, between the reverse osmosis mechanism and the DTRO system, and between the DTRO system and the MVR system. A water pump is installed, and the liquid in the regulating tank is pumped into the UASB anaerobic tank by the water pump, and the liquid in the UASB anaerobic tank is pumped into the anaerobic tank by the water pump. The liquid in the anaerobic tank is pumped into the anoxic tank one by a water pump, the liquid in the anoxic tank two is pumped into the aerobic tank one by a water pump, the liquid in the aerobic tank one is pumped into the aerobic tank two by a water pump, the liquid in the aerobic tank two is pumped into the aerobic tank three by a water pump, the liquid in the aerobic tank three is pumped into the ultrafiltration mechanism by a water pump, the liquid in the ultrafiltration mechanism is pumped into the nanofiltration mechanism by a water pump, the liquid in the nanofiltration mechanism is pumped into the reverse osmosis mechanism by a water pump, the liquid in the reverse osmosis mechanism is pumped into the DTRO system by a water pump, and the liquid in the DTRO system is pumped into the MVR system by a water pump.

[0006] Preferably, the ultrafiltration mechanism comprises a first ultrafiltration box and a second ultrafiltration box, wherein ultrafiltration cores are fixedly installed in the first ultrafiltration box and the second ultrafiltration box, and the top and bottom of the ultrafiltration cores are connected to water inlet pipes and water pipes, the ends of the water pipes pass through the ultrafiltration core, and the ends of the two water pipes are connected to connecting pipes, and the ends of the connecting pipes at the bottom ends of the first ultrafiltration box and the second ultrafiltration box are connected to the nanofiltration mechanism through a water pump.

[0007] Preferably, a control valve is installed on the outer side of the water pipe located at one end of the connecting pipe.

[0008] Preferably, the nanofiltration mechanism includes a nanofiltration box, the connecting pipe ends at the bottom ends of the first ultrafiltration box and the second ultrafiltration box are connected to the top of the nanofiltration box through a water pump, a diverter plate is fixedly installed at the top of the inside of the nanofiltration box, a nanofiltration membrane is fixedly installed below the diverter plate in the nanofiltration box, and the bottom end of the nanofiltration box is connected to the reverse osmosis mechanism through a water pump.

[0009] Preferably, the reverse osmosis mechanism includes a reverse osmosis box, the bottom end of the nanofiltration box is connected to the top center of the reverse osmosis box through a water pump, a barrel-shaped reverse osmosis membrane is fixedly connected to the bottom of the inner wall of the reverse osmosis box, a clean water outlet is provided at the bottom center of the reverse osmosis box, and the clean water outlet is connected to the DTRO system through a water pump.

[0010] Preferably, the surface of the diverter plate is provided with communication openings at equal intervals.

[0011] Preferably, the top of the barrel-shaped reverse osmosis membrane is a hemispherical structure.

[0012] Compared with the prior art, the beneficial effects of the utility model are:

[0013] 1. The utility model uses the first ultrafiltration box and the second ultrafiltration box of the ultrafiltration mechanism to control the first ultrafiltration box and the second ultrafiltration box to work alternately during the ultrafiltration process, and can clean the ultrafiltration element inside the ultrafiltration box that stops working, without suspending the ultrafiltration work of the wastewater, thereby greatly improving the wastewater treatment efficiency.

[0014] 2. The utility model can buffer the water entering the nanofiltration box by arranging a diverter plate at the top of the nanofiltration box, thereby preventing the water from directly impacting the nanofiltration membrane and causing its deformation, thereby affecting the nanofiltration effect. The arrangement of the diverter plate can disperse the water flow and make the water flow evenly to the nanofiltration membrane. While protecting the nanofiltration membrane, it also avoids the situation in which the nanofiltered substances are locally distributed on the surface of the nanofiltration membrane and cause blockage.

[0015] 3. The utility model arranges a barrel-shaped reverse osmosis membrane in a reverse osmosis box, and arranges the barrel-shaped reverse osmosis membrane as a barrel-shaped structure as a whole, with a hemispherical structure at the top, so that the water entering the reverse osmosis box can be reversely osmotic through the entire surface of the barrel-shaped reverse osmosis membrane. The hemispherical structure design at the top can disperse the water flowing into the reverse osmosis box to the outside, avoiding the situation where the water flow is only filtered through the top of the barrel-shaped reverse osmosis membrane and causing the top of the barrel-shaped reverse osmosis membrane to be blocked. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0017] Figure 2 It is a schematic diagram of the connection structure of the ultrafiltration mechanism, nanofiltration mechanism and reverse osmosis mechanism of the utility model;

[0018] Figure 3 This is a schematic diagram of the connection structure of the ultrafiltration mechanism and the nanofiltration mechanism of the utility model;

[0019] Figure 4 It is a schematic diagram of the structure of the principle diagram of the utility model.

[0020] In the figure: 1. base; 2. regulating tank; 3. UASB anaerobic tank; 4. anaerobic tank; 5. anoxic tank one; 6. anoxic tank two; 7. aerobic tank one; 8. aerobic tank two; 9. aerobic tank three; 10. ultrafiltration mechanism; 11. first ultrafiltration box; 12. nanofiltration box; 13. reverse osmosis box; 14. control valve; 15. second ultrafiltration box; 16. ultrafiltration element; 17. water pipe; 18. connecting pipe; 19. diverter plate; 20. nanofiltration membrane; 21. barrel reverse osmosis membrane; 22. nanofiltration mechanism; 23. clean water outlet; 24. reverse osmosis mechanism; 25. DTRO system; 26. MVR system. DETAILED DESCRIPTION

[0021] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0022] See also Figure 1-4 The utility model provides a technical solution: a nitrogen-containing wastewater treatment device, comprising a base 1, a regulating tank 2 is installed on the top of the base 1, and a UASB anaerobic tank 3 is fixedly installed outside the regulating tank 2, an anaerobic tank 4 is installed outside the UASB anaerobic tank 3, an anoxic tank 2 6 and an anoxic tank 1 5 are respectively installed in the vertical direction at one end of the top of the base 1 away from the regulating tank 2, and the anoxic tank 1 5 is located on the top of the anoxic tank 2 6, and the bottom of the anoxic tank 1 5 is connected with the inside of the anoxic tank 2 6 through a pipeline, an aerobic tank 1 7, an aerobic tank 2 8 and an aerobic tank 3 9 are installed in sequence on the side of the anoxic tank 2 6 at the top of the base 1, and an ultrafiltration mechanism 10, a nanofiltration mechanism 22, a reverse osmosis mechanism 24, a DTRO system 25 and an MVR system 26 are respectively arranged on the outside of the aerobic tank 3 9 at the top of the base 1.

[0023] It should be noted that, in the utility model, after the leachate enters the regulating tank 2, it is lifted to the UASB anaerobic tank 3 for anaerobic fermentation, and the fermentation liquid is mixed with the nitrified liquid returned from the aerobic tank 3 9 and then enters the anoxic tank 2 6, so that the aerobic sludge mixed liquid returns to a better anoxic state in this area, and then enters the anoxic tank 1 5 and the anoxic tank 2 6 for denitrification and denitrification, and then enters the aerobic tank 1 7, the aerobic tank 2 8, and the aerobic tank 3 9 for nitrification reaction to remove ammonia nitrogen. In order to improve the total nitrogen removal effect, a part of the leachate stock liquid is surpassed to the anoxic tank 1 5, and the effluent of the aerobic tank 3 9 reaches the ultrafiltration mechanism 10. After the ultrafiltration mechanism 10 is separated from the mud and water, the produced water enters the nanofiltration mechanism 22 for treatment, and the mud and water are returned to the anaerobic tank 4. The produced water of the nanofiltration mechanism 22 enters the reverse osmosis mechanism 24 for treatment;

[0024] ② After the biogas slurry enters the regulating tank 2, it is lifted to the anoxic tank 1 5 and the anoxic tank 2 6 for denitrification. The C / N ratio of the biogas slurry is unbalanced, and a certain amount of leachate stock solution is exceeded every day to assist in denitrification. The effluent from the anoxic tank 2 6 enters the aerobic tank 1 7, the aerobic tank 2 8 and the aerobic tank 3 9 for ammonia nitrogen removal. The effluent from the aerobic tank 3 9 enters the ultrafiltration mechanism 10 for mud and water separation, and the produced water enters the nanofiltration mechanism 22 of the leachate treatment system for treatment;

[0025] ③ The animal sewage and sludge filtrate are directly treated in the anaerobic tank 4 in the leachate treatment system, and the subsequent process is consistent with ①; the concentrated liquid produced by the nanofiltration mechanism 22 and the reverse osmosis mechanism 24 enters the DTRO system 25 for further reduction, and the concentrated liquid enters the MVR system 26 for evaporation and concentration and then is reused in the pulping process of the power generation department.

[0026] Water pumps are installed on the top of the base 1, which are located between the regulating tank 2 and the UASB anaerobic tank 3, between the UASB anaerobic tank 3 and the anaerobic tank 4, between the anaerobic tank 4 and the anoxic tank 1 5, between the anoxic tank 2 6 and the aerobic tank 1 7, between the aerobic tank 1 7 and the aerobic tank 2 8, between the aerobic tank 2 8 and the aerobic tank 3 9, between the aerobic tank 3 9 and the ultrafiltration mechanism 10, between the ultrafiltration mechanism 10 and the nanofiltration mechanism 22, between the nanofiltration mechanism 22 and the reverse osmosis mechanism 24, between the reverse osmosis mechanism 24 and the DTRO system 25, and between the DTRO system 25 and the MVR system 26.

[0027] It should be noted that by installing a water pump between two adjacent components, it can be used for water transportation and transfer, thereby facilitating the step-by-step treatment of wastewater.

[0028] The liquid in the regulating tank 2 is pumped into the UASB anaerobic tank 3 by a water pump, the liquid in the UASB anaerobic tank 3 is pumped into the anaerobic tank 4 by a water pump, the liquid in the anaerobic tank 4 is pumped into the anoxic tank 1 5 by a water pump, the liquid in the anoxic tank 2 6 is pumped into the aerobic tank 1 7 by a water pump, the liquid in the aerobic tank 1 7 is pumped into the aerobic tank 2 8 by a water pump, the liquid in the aerobic tank 2 8 is pumped into the aerobic tank 3 9 by a water pump, the liquid in the aerobic tank 3 9 is pumped into the ultrafiltration mechanism 10 by a water pump, the liquid in the ultrafiltration mechanism 10 is pumped into the nanofiltration mechanism 22 by a water pump, the liquid in the nanofiltration mechanism 22 is pumped into the reverse osmosis mechanism 24 by a water pump, the liquid in the reverse osmosis mechanism 24 is pumped into the DTRO system 25 by a water pump, and the liquid in the DTRO system 25 is pumped into the MVR system 26 by a water pump.

[0029] It should be noted that, in the process of wastewater treatment, the landfill leachate first enters the regulating tank 2, and then the water in the regulating tank 2 is pumped into the UASB anaerobic tank 3 for anaerobic fermentation through an external water pump. After anaerobic fermentation, it is pumped into the anoxic tank 2 6 through a water pump. At the same time, the digestate refluxed from the aerobic tank 3 9 is mixed with the liquid in the UASB anaerobic tank 3 pumped out by the water pump, and enters the anoxic tank 2 6 together, so that the aerobic refluxed sludge mixed liquid is in a better anoxic state in this area. Then the liquid is pumped into anoxic tank 1 5 and anoxic tank 2 6 for denitrification and denitrification, and then enters aerobic tank 1 7, aerobic tank 2 8, and aerobic tank 3 9 for nitrification reaction to remove ammonia nitrogen. In order to improve the total nitrogen removal effect, a part of the leachate raw liquid is exceeded to anoxic tank 1 5, and the effluent of aerobic tank 3 9 reaches the ultrafiltration mechanism 10. After the mud and water are separated by the ultrafiltration mechanism 10, the produced water enters the nanofiltration mechanism 22 for treatment, and the mud and water are returned to the anaerobic tank 4. The produced water of the nanofiltration mechanism 22 enters the reverse osmosis mechanism 24 for treatment.

[0030] The ultrafiltration mechanism 10 includes a first ultrafiltration box 11 and a second ultrafiltration box 15. Ultrafiltration elements 16 are fixedly installed in the first ultrafiltration box 11 and the second ultrafiltration box 15, and the top and bottom of the ultrafiltration element 16 are connected to a water inlet pipe and a water pipe 17. The ends of the water pipe 17 pass through the ultrafiltration element 16. The ends of the two water pipes 17 are connected to a connecting pipe 18. The ends of the connecting pipe 18 at the bottom of the first ultrafiltration box 11 and the second ultrafiltration box 15 are connected to the nanofiltration mechanism 22 through a water pump.

[0031] It should be noted that the ultrafiltration effect on wastewater can be achieved through the ultrafiltration mechanism 10. When the ultrafiltration process is carried out through the first ultrafiltration box 11 and the second ultrafiltration box 15 of the ultrafiltration mechanism 10, the first ultrafiltration box 11 and the second ultrafiltration box 15 can be controlled to work alternately, and the ultrafiltration element 16 inside the stopped ultrafiltration box can be cleaned without suspending the ultrafiltration work of the wastewater, which greatly improves the wastewater treatment efficiency.

[0032] The water pipe 17 is located at the outer side of one end of the connecting pipe 18 and a control valve 14 is installed.

[0033] It should be noted that, by installing the control valve 14 on the outside of the water pipe 17, when the first ultrafiltration box 11 is used to ultrafilter the wastewater, the control valve 14 on the water pipe 17 at the top of the second ultrafiltration box 15 can be closed; when the second ultrafiltration box 15 is used to ultrafilter the wastewater, the control valve 14 on the water pipe 17 at the top of the first ultrafiltration box 11 can be closed.

[0034] The nanofiltration mechanism 22 includes a nanofiltration box 12, the end of the connecting pipe 18 at the bottom of the first ultrafiltration box 11 and the second ultrafiltration box 15 is connected to the top of the nanofiltration box 12 through a water pump, a diverter plate 19 is fixedly installed at the top of the nanofiltration box 12, a nanofiltration membrane 20 is fixedly installed below the diverter plate 19 in the nanofiltration box 12, and the bottom of the nanofiltration box 12 is connected to the reverse osmosis mechanism 24 through a water pump.

[0035] It should be noted that when nanofiltration is performed on wastewater, the water after ultrafiltration is pumped into the top of the nanofiltration box 12 by a water pump, and the water entering the nanofiltration box 12 is buffered by the diverter plate 19, thereby avoiding the situation where the water directly impacts the nanofiltration membrane 20 and causes its deformation, thereby affecting the nanofiltration effect. The setting of the diverter plate 19 can disperse the water flow and make the water flow evenly to the nanofiltration membrane 20.

[0036] The reverse osmosis mechanism 24 includes a reverse osmosis box 13, the bottom end of the nanofiltration box 12 is connected to the top center of the reverse osmosis box 13 through a water pump, a barrel-shaped reverse osmosis membrane 21 is fixedly connected to the bottom of the inner wall of the reverse osmosis box 13, and a clean water outlet 23 is provided at the bottom center of the reverse osmosis box 13, and the clean water outlet 23 is connected to the DTRO system 25 through a water pump.

[0037] It should be noted that the water entering the reverse osmosis box 13 first impacts the top of the barrel-shaped reverse osmosis membrane 21. Part of the water after the impact is filtered through the top of the barrel-shaped reverse osmosis membrane 21, and the other part is dispersed into the bottom end of the nanofiltration box 12 and filtered through the outer wall of the barrel-shaped reverse osmosis membrane 21, thereby achieving a large-area reverse osmosis effect.

[0038] The surface of the diverter plate 19 is provided with communication openings at equal intervals.

[0039] It should be noted that the multiple communication ports are used to divert water so that the water can flow evenly to the nanofiltration membrane 20 .

[0040] The top of the barrel-shaped reverse osmosis membrane 21 is in a hemispherical structure.

[0041] It should be noted that the hemispherical structure design of the barrel-shaped reverse osmosis membrane 21 allows the water flowing into the reverse osmosis box 13 to be dispersed outside, avoiding the situation where the water flow is only filtered through the top of the barrel-shaped reverse osmosis membrane 21 and causes blockage of the top of the barrel-shaped reverse osmosis membrane 21.

[0042] In the description of the present invention, it should be understood that the terms "coaxial", "bottom", "one end", "top", "middle", "the other end", "upper", "one side", "top", "inside", "front", "center", "both ends" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0043] In addition, the terms "first", "second", "third" and "fourth" are used for descriptive purposes only and are not to be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, the features defined as "first", "second", "third" and "fourth" may explicitly or implicitly include at least one of such features.

[0044] In the present utility model, unless otherwise clearly stipulated and limited, the terms such as "installation", "setting", "connection", "fixation" and "screw-on" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integrated connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. Unless otherwise clearly defined, ordinary technicians in this field can understand the specific meanings of the above terms in the utility model according to the specific circumstances.

[0045] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A nitrogen-containing wastewater treatment device, comprising a base (1), characterized in that: A regulating tank (2) is installed on the top of the base (1), and a UASB anaerobic tank (3) is fixedly installed outside the regulating tank (2), and an anaerobic tank (4) is installed outside the UASB anaerobic tank (3). An anoxic tank 2 (6) and an anoxic tank 1 (5) are respectively installed along the vertical direction at one end of the top of the base (1) away from the regulating tank (2), and the anoxic tank 1 (5) is located on the top of the anoxic tank 2 (6). The bottom of the anoxic tank 1 (5) is connected to the inside of the anoxic tank 2 (6) through a pipeline. An aerobic tank 1 (7), an aerobic tank 2 (8) and an aerobic tank 3 (9) are installed in sequence on the side of the anoxic tank 2 (6) on the top of the base (1), and an ultrafiltration mechanism (10), a nanofiltration mechanism (22), a reverse osmosis mechanism (24), a DTRO system (25) and an MVR system (26) are respectively arranged on the top of the base (1) and outside the aerobic tank 3 (9).

2. A nitrogen-containing wastewater treatment device according to claim 1, characterized in that: The top of the base (1) is located between the regulating tank (2) and the UASB anaerobic tank (3), between the UASB anaerobic tank (3) and the anaerobic tank (4), between the anaerobic tank (4) and the anoxic tank (5), between the anoxic tank (6) and the aerobic tank (7), between the aerobic tank (7) and the aerobic tank (8), between the aerobic tank (8) and the aerobic tank (9), between the aerobic tank (9) and the ultrafiltration mechanism (10), between the ultrafiltration mechanism (10) and the nanofiltration mechanism (22), between the nanofiltration mechanism (22) and the reverse osmosis mechanism (24), between the reverse osmosis mechanism (24) and the DTRO system (25), and between the DTRO system (25) and the MVR system (26). A water pump is installed. The liquid in the regulating tank (2) is pumped into the UASB anaerobic tank (3) by the water pump. The liquid in the UASB anaerobic tank (3) is The liquid in the anaerobic tank (4) is pumped into the anoxic tank one (5) by a water pump, the liquid in the anoxic tank two (6) is pumped into the aerobic tank one (7) by a water pump, the liquid in the aerobic tank one (7) is pumped into the aerobic tank two (8) by a water pump, the liquid in the aerobic tank two (8) is pumped into the aerobic tank three (9) by a water pump, the liquid in the aerobic tank three (9) is pumped into the ultrafiltration mechanism (10) by a water pump, the liquid in the ultrafiltration mechanism (10) is pumped into the nanofiltration mechanism (22) by a water pump, the liquid in the nanofiltration mechanism (22) is pumped into the reverse osmosis mechanism (24) by a water pump, the liquid in the reverse osmosis mechanism (24) is pumped into the DTRO system (25) by a water pump, and the liquid in the DTRO system (25) is pumped into the MVR system (26) by a water pump.

3. A nitrogen-containing wastewater treatment device according to claim 1, characterized in that: The ultrafiltration mechanism (10) comprises a first ultrafiltration box (11) and a second ultrafiltration box (15), wherein an ultrafiltration core (16) is fixedly installed in the first ultrafiltration box (11) and the second ultrafiltration box (15), and the top and the bottom of the ultrafiltration core (16) are connected to a water inlet pipe and a water pipe (17), the ends of the water pipe (17) pass through the ultrafiltration core (16), and the ends of the two water pipes (17) are connected to a connecting pipe (18), and the ends of the connecting pipe (18) at the bottom of the first ultrafiltration box (11) and the second ultrafiltration box (15) are connected to the nanofiltration mechanism (22) through a water pump.

4. A nitrogen-containing wastewater treatment device according to claim 3, characterized in that: The water pipe (17) is provided with a control valve (14) on the outer side of one end of the connecting pipe (18).

5. A nitrogen-containing wastewater treatment device according to claim 3, characterized in that: The nanofiltration mechanism (22) comprises a nanofiltration box (12); the ends of the connecting pipes (18) at the bottom ends of the first ultrafiltration box (11) and the second ultrafiltration box (15) are connected to the top end of the nanofiltration box (12) via a water pump; a diverter plate (19) is fixedly installed at the top end of the nanofiltration box (12); a nanofiltration membrane (20) is fixedly installed below the diverter plate (19) in the nanofiltration box (12); and the bottom end of the nanofiltration box (12) is connected to a reverse osmosis mechanism (24) via a water pump.

6. A nitrogen-containing wastewater treatment device according to claim 5, characterized in that: The reverse osmosis mechanism (24) comprises a reverse osmosis box (13), the bottom end of the nanofiltration box (12) is connected to the top center of the reverse osmosis box (13) through a water pump, a barrel-shaped reverse osmosis membrane (21) is fixedly connected to the bottom of the inner wall of the reverse osmosis box (13), a clean water outlet (23) is provided at the bottom center of the reverse osmosis box (13), and the clean water outlet (23) is connected to a DTRO system (25) through a water pump.

7. A nitrogen-containing wastewater treatment device according to claim 5, characterized in that: The surface of the diverter plate (19) is provided with communication openings at equal intervals.

8. A nitrogen-containing wastewater treatment device according to claim 6, characterized in that: The top end of the barrel-shaped reverse osmosis membrane (21) is in a hemispherical structure.

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