CN219194679U - Novel landfill leachate denitrification device - Google Patents

Abstract

The utility model relates to the technical field related to sewage treatment, in particular to a novel garbage leachate denitrification device. Comprises a water tank, a reactor and a secondary sedimentation tank, wherein an anoxic first zone, an aerobic first zone, an anoxic second zone and an aerobic second zone are sequentially arranged in the reactor from one end to the other end, and an overflow port I is arranged at the lower end between the anoxic first zone and the aerobic first zone. According to the utility model, carbon source equipment in the traditional device is removed, a carbon source is not added any more, the occupation of the space of the device is reduced, and the required cost is reduced; in the anoxic second zone, the co-denitrification in one zone is realized through heterotrophic denitrification of denitrifying bacteria and autotrophic of anaerobic ammonia oxidation bacteria, so that the aim of high-efficiency deep denitrification is fulfilled. Through adding k3 polyethylene suspension filler, an attachment condition can be better provided for the proliferation of anaerobic ammonia oxidizing bacteria; by adopting the addition of the suspended filler, compared with the reactor in the prior art, a filler bracket is not required to be added, and the stirring and the maintenance of aeration equipment are convenient.

Description

Novel landfill leachate denitrification device

Technical Field

The utility model relates to the technical field related to sewage treatment, in particular to a novel garbage leachate denitrification device.

Background

With the acceleration of urban household garbage process, the yield of urban household garbage is improved year by year, the most important treatment mode of urban garbage is sanitary landfill, and a large amount of garbage percolate can be generated in the landfill process of garbage; in the traditional garbage leachate treatment process, nitrogen in the garbage leachate is mainly removed through a whole-course nitrification-denitrification process, ammonia nitrogen in sewage is oxidized into nitrate nitrogen under the nitrification action of nitrifying bacteria under an aerobic condition, and the nitrate nitrogen is reduced into nitrogen to escape under an anoxic condition through denitrification, so that the aim of sewage denitrification is fulfilled.

In a denitrification device used for traditional landfill leachate treatment, biochemical treatment is a main pollutant removal step, carbon source equipment is required to be used for adding carbon sources to ensure that the C/N ratio of the landfill leachate maintains biochemical reaction, so that the device occupies more space and has higher cost; and stable short-cut nitrification requires great operational difficulty and is not technically enough to achieve stable nitrite accumulation in continuous flow reactors.

Therefore, the application provides a novel landfill leachate denitrification device, and provides a novel technical scheme for solving the technical problems mentioned in the patent.

Disclosure of Invention

The utility model aims to provide a novel landfill leachate denitrification device, which aims at the technical problems: in a denitrification device used for traditional landfill leachate treatment, biochemical treatment is a main pollutant removal step, and carbon source equipment is required to be added to ensure that the C/N ratio of the landfill leachate maintains biochemical reaction, so that the device occupies more space and has higher cost.

In order to solve the technical problems, the utility model adopts the following technical scheme:

the novel garbage leachate denitrification device comprises a water tank, a reactor and a secondary sedimentation tank, wherein an anoxic first region, an aerobic first region, an anoxic second region and an aerobic second region are sequentially arranged in the reactor from one end to the other end, an overflow port I is arranged at the lower end between the anoxic first region and the aerobic first region, and the anoxic first region and the aerobic first region are communicated through the overflow port I; an overflow port II is formed in the upper part between the aerobic first region and the anoxic second region, and the aerobic first region and the anoxic second region are communicated through the overflow port II; an overflow port III is formed in the lower end between the anoxic zone II and the aerobic zone II, and the anoxic zone II and the aerobic zone II are communicated in a three-phase manner through the overflow port;

a water inlet port is formed in one side of the anoxic first zone, the water tank is connected with the water inlet port through a connecting pipeline, a first peristaltic pump is arranged on the connecting pipeline, the secondary sedimentation tank is fixedly connected with the reactor, the secondary sedimentation tank is positioned at one end close to the aerobic second zone, and the secondary sedimentation tank is used for separating mud from water;

the inside of the anoxic first zone and the anoxic second zone are respectively provided with a speed-adjustable stirrer for stirring the filler;

the bottoms of the reactor and the secondary sedimentation tank are provided with reflux structures for refluxing nitrifying liquid and sludge;

the bottom of the reactor is also provided with an aeration structure for providing dissolved oxygen in the reactor.

Preferably, the overflow pipe is vertically arranged in the secondary sedimentation tank, the overflow pipe is communicated with the inside of the anoxic secondary region through a branch pipe, an overflow frame is arranged in the secondary sedimentation tank and positioned at the position above the overflow pipe, the overflow frame is fixedly connected with the secondary sedimentation tank through a fixing plate, a separation plate is arranged at the position, corresponding to the overflow frame, of the outer side of the secondary sedimentation tank, a guide plate is fixed at the position, below the overflow pipe, of the bottom end of the secondary sedimentation tank, and a mud discharging pipe is fixed at the bottom of the secondary sedimentation tank.

Preferably, the speed-adjustable stirrer comprises a stirring rod, the upper part of the stirring rod is rotationally connected with the reactor through a mounting frame, a plurality of spiral blades are fixed on the lower part of the stirring rod, and the top end of the stirring rod is connected with a speed-adjustable motor.

Preferably, the reflux structure comprises a reflux pipe I, a reflux pipe II and a reflux pipe III, wherein one end of the reflux pipe I is communicated with the bottom of the anoxic area I, and the other end of the reflux pipe I is communicated with the bottom of the secondary sedimentation tank; one end of the second return pipe is communicated with the bottom of the anoxic zone I, and the other end of the second return pipe is communicated with the bottom of the aerobic zone I; one end of the return pipe III is communicated with the bottom of the anoxic zone II, and the other end of the return pipe III is communicated with the bottom of the aerobic zone II; and the first return pipe, the second return pipe and the third return pipe are respectively provided with a second peristaltic pump.

Preferably, the aeration structure comprises an aeration main pipe, two first extension pipes are arranged at one end of the aeration main pipe, two first extension pipes are far away from one end of the aeration main pipe and all extend to the inside of an aerobic zone, a second extension pipe is arranged at the other end of the aeration main pipe, one end of the second extension pipe far away from the aeration main pipe extends to the inside of an anoxic zone, two aeration discs are fixed at one ends of the first extension pipes and the second extension pipes far away from the aeration main pipe, and an aeration pump is connected to the aeration main pipe through a branch pipe.

Preferably, the number of the spiral blades is two.

Preferably, the water inlet is provided with a non-return valve.

It can be clearly seen that the technical problems to be solved by the present application must be solved by the above-mentioned technical solutions of the present application.

Through the technical scheme, the utility model has at least the following beneficial effects:

through the cooperation design of a plurality of structures, the device can carry out denitrification treatment on garbage leachate, the sludge concentration of the system can be maintained to the maximum extent through the reactor, the sludge loss is prevented, the residual sludge is less, and the removal rate of pollutants can be improved; the carbon source equipment in the traditional device is removed, the carbon source is not added, the occupied space of the device is reduced, and meanwhile, the required cost is reduced; in the anoxic second zone, the co-denitrification in one zone is realized through heterotrophic denitrification of denitrifying bacteria and autotrophic of anaerobic ammonia oxidation bacteria, so that the aim of high-efficiency deep denitrification is fulfilled.

Through adding k3 polyethylene suspension filler, an attachment condition can be better provided for the proliferation of anaerobic ammonia oxidizing bacteria; by adopting the addition of the suspended filler, compared with the reactor in the prior art, a filler bracket is not required to be added, and the stirring and the maintenance of aeration equipment are convenient.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the drawings required for the description of the embodiments will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present utility model, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

FIG. 1 is a schematic diagram of the overall structure of a novel landfill leachate denitrification device;

FIG. 2 is a schematic structural view of a reflux structure of a novel landfill leachate denitrification device;

FIG. 3 is a schematic structural view of an aeration structure of a novel landfill leachate denitrification device;

FIG. 4 is a schematic diagram of the internal structure of a secondary sedimentation tank of the novel landfill leachate denitrification device.

In the figure: 1. a water tank; 2. a reactor; 21. an anoxic first zone; 22. an aerobic first zone; 23. an anoxic second zone; 24. an aerobic second zone; 3. a secondary sedimentation tank; 31. an overflow pipe; 32. an overflow frame; 33. a partition plate; 34. a guide plate; 4. a stirring rod; 5. a helical blade; 6. a connecting pipe; 7. a first peristaltic pump; 8. an overflow port I; 9. an overflow port II; 10. an overflow port III; 11. a water inlet port; 12. a return pipe I; 13. a return pipe II; 14. a return pipe III; 15. a mud pipe; 16. an aeration main pipe; 17. an aeration disc.

Detailed Description

The present utility model will be described in further detail with reference to the drawings and examples, in order to make the objects, technical solutions and advantages of the present utility model more apparent. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the utility model.

Referring to fig. 1-4, a novel garbage leachate denitrification device comprises a water tank 1, a reactor 2 and a secondary sedimentation tank 3, wherein an anoxic first region 21, an aerobic first region 22, an anoxic second region 23 and an aerobic second region 24 are sequentially arranged in the reactor 2 from one end to the other end, an overflow port I8 is arranged at the lower end between the anoxic first region 21 and the aerobic first region 22, and the anoxic first region 21 and the aerobic first region 22 are communicated through the overflow port I8; an overflow port II 9 is formed in the upper part between the aerobic first region 22 and the anoxic second region 23, and the aerobic first region 22 and the anoxic second region 23 are communicated through the overflow port II 9; an overflow port III 10 is formed at the lower end between the anoxic second region 23 and the aerobic second region 24, and the anoxic second region 23 and the aerobic second region 24 are communicated through the overflow port III 10;

a water inlet port 11 is arranged on one side of the anoxic first area 21, the water tank 1 is connected with the water inlet port 11 through a connecting pipeline 6, wherein a check valve is arranged on the water inlet port 11 to avoid liquid backflow, and a first peristaltic pump 7 is arranged on the connecting pipeline 6; the anaerobic first zone 21 and the anaerobic second zone 23 are respectively provided with a speed-adjustable stirrer for stirring the filler; specifically, the adjustable speed agitator includes puddler 4, and the upper portion of puddler 4 is rotated with reactor 2 through the mounting bracket and is connected, in order to make mud and packing fully contact, and the lower part of puddler 4 is fixed with a plurality of helical blade 5, and in this embodiment, helical blade 5's quantity is two, and the top of puddler 4 is connected with adjustable speed motor, rotates through adjustable speed motor drive puddler 4.

The secondary sedimentation tank 3 is fixedly connected with the reactor 2, the secondary sedimentation tank 3 is positioned at one end close to the aerobic secondary zone 24, and the secondary sedimentation tank 3 is used for separating mud from water; specifically, the inside vertical overflow pipe 31 that is provided with of secondary sedimentation tank 3, overflow pipe 31 is linked together through branch pipe and the inside of anoxic two district 23, and the inside of secondary sedimentation tank 3 just is located the position department of overflow pipe 31 top and is provided with overflow frame 32, and overflow frame 32 passes through fixed plate and secondary sedimentation tank 3 fixed connection, and the outside of secondary sedimentation tank 3 just is provided with division board 33 with the position department that overflow frame 32 corresponds, and the inside bottom of secondary sedimentation tank 3 just is located the position department of overflow pipe 31 below is fixed with guide board 34, and the bottom of secondary sedimentation tank 3 is fixed with mud pipe 15.

The bottoms of the reactor 2 and the secondary sedimentation tank 3 are provided with reflux structures for refluxing nitrifying liquid and sludge; specifically, the reflux structure comprises a first reflux pipe 12, a second reflux pipe 13 and a third reflux pipe 14, one end of the first reflux pipe 12 is communicated with the bottom of the first anoxic zone 21, and the other end of the first reflux pipe 12 is communicated with the bottom of the secondary sedimentation tank 3; one end of the return pipe II 13 is communicated with the bottom of the anoxic zone I21, and the other end of the return pipe II 13 is communicated with the bottom of the aerobic zone I22; one end of the return pipe III 14 is communicated with the bottom of the anoxic second zone 23, and the other end of the return pipe III 14 is communicated with the bottom of the aerobic second zone 24; and the first return pipe 12, the second return pipe 13 and the third return pipe 14 are respectively provided with a second peristaltic pump.

The bottom of the reactor 2 is also provided with an aeration structure for providing dissolved oxygen within the reactor 2. Specifically, the aeration structure includes aeration main pipe 16, and aeration main pipe 16's one end is provided with two first extension pipes, and two first extension pipes keep away from aeration main pipe 16's one end and all extend to inside the good oxygen first district 22, and aeration main pipe 16's the other end is provided with the second extension pipe, and the one end that aeration main pipe 16 was kept away from to the second extension pipe extends to inside the anoxic second district 23, and two first extension pipes and second extension pipe keep away from aeration main pipe 16's one end all are fixed with aeration dish 17, have the aeration pump through leg joint on the aeration main pipe 16.

Specifically, the landfill leachate is pumped out of the water tank 1 through the stirring rod 4 and pumped into the anoxic zone 21 in the reactor 2 through the water inlet 11, and a check valve is added at the front end of the water inlet 11 in order to prevent the pressure change from changing the accuracy of the stirring rod 4 due to the water level difference between the stirring rod 4 and the water inlet surface. A set of speed-adjustable stirrer is arranged in the anoxic zone 21, and two helical blades 5 with the length of about 8cm are arranged on a stirring rod 4 in the speed-adjustable stirrer in the anoxic zone 21. The distance between the two spiral blades 5 was 13cm, and the stirring speed was 60r/min.

Thirty three percent of k3 polyethylene suspension filler (hereinafter referred to as filler) is added into the anoxic zone 21, a filler bracket is not required to be added into the reactor 2, the stirring in the reactor 2 and the maintenance of aeration equipment are facilitated, the filler and the suspension sludge can better react in the reactor 2 through an adjustable speed stirrer, the sludge and the filler can be fully contacted by a proper rotating speed, and the falling of a biological film caused by a larger rotating speed can be avoided. The bottom of the anoxic first zone 21 is provided with two water outlets, one water outlet is connected with the aerobic first zone 22 through a return pipe II 13, the nitrate nitrogen reflux liquid in the aerobic first zone 22 can provide substrates for denitrification in the anoxic first zone 21, and the other water outlet is connected with the bottom of the secondary sedimentation tank 3 through a return pipe II 12 and is used for refluxing sludge in the secondary sedimentation tank 3.

The liquid in the anoxic first zone 21 flows to the aerobic first zone 22 through the overflow port first 8, the bottom of the aerobic first zone 22 is provided with two aeration discs 17 with the diameter of 100mm, and the aeration discs 17 in the aerobic first zone 22 are connected to an aeration pump through an aeration main pipe 16 to control DO in the aerobic first zone 22 to be 2-3mg/L. Thirty three percent of filler is added into the first aerobic zone 22, the filler can keep fluidization in the first aerobic zone 22 through uniform bubbles exposed by the aeration disc 17, activated sludge can be well intercepted on the surface and the inner wall of the filler, the loss of sludge can be reduced, the unique structure of the filler can cut large bubbles released by the aeration disc 17 to fluidize the filler, a water outlet is arranged at the bottom of the first aerobic zone 22, liquid flows back to the first anoxic zone 21 through the second return pipe 13, and the liquid can flow into the second anoxic zone 23 when the overflow port II 9 is arranged between the first aerobic zone 22 and the second anoxic zone 23.

A set of stirrer with adjustable rotation speed is also arranged in the anoxic second region 23, and two helical blades 5 with the length of about 4cm are arranged on a stirring rod 4 in the stirrer with adjustable rotation speed in the anoxic second region 23. The distance between the two spiral blades 5 was 13cm, and the stirring speed was 60r/min.

Thirty three percent of filler is added into the anoxic two zone 23, the filler and suspended sludge can better react in the reactor 2 through a stirrer with the rotating speed regulated, and the sludge and the filler can be fully contacted by the proper rotating speed, so that the falling of a biological film caused by the larger rotating speed can be avoided. A water outlet is arranged at the bottom of the anoxic second zone 23 and is connected with the aerobic second zone 24 through a return pipe III 14, and the nitrate nitrogen reflux liquid in the aerobic second zone 24 can provide a substrate for denitrification of the anoxic second zone 23. The liquid in the anoxic second zone 23 flows to the aerobic second zone 24 through the overflow port three 10.

The bottom of the aerobic second zone 24 is provided with an aeration disc 17 with the diameter of 80mm, and the aeration disc 17 in the aerobic second zone 24 is also connected to an aeration pump through an aeration main pipe 16 to control DO in the aerobic second zone 24 to be 2-3mg/L. Thirty three percent of filler is added into the aerobic second zone 24, the filler can keep fluidization in the aerobic second zone 24 through uniform bubbles exposed by the aeration disc 17, activated sludge can be well intercepted on the surface and the inner wall of the filler, the loss of the sludge can be reduced, a water outlet is arranged at the bottom of the aerobic second zone 24, liquid flows back to the anoxic second zone 23 through the return pipe III 14,

the inside of the secondary sedimentation tank 3 is vertically provided with an overflow pipe 31, the overflow pipe 31 is communicated with the inside of the anoxic secondary region 23 through a branch pipe, liquid in the aerobic secondary region 24 flows into the secondary sedimentation tank 3 through a branch pipe on the overflow pipe 31, mud-water separation is realized after passing through a serrated overflow frame 32 at the upper part of the secondary sedimentation tank 3, supernatant fluid is discharged through a separation plate 33 at the upper part of the secondary sedimentation tank 3, sludge is precipitated and flows to the bottom of the secondary sedimentation tank 3 through the guide of a guide plate 34, two water outlets are formed in the bottom of the secondary sedimentation tank 3, one is a sludge discharge pipe 15 for periodically discharging sludge, and the other is connected with the anoxic primary region 21 through a return pipe 12 for returning sludge.

From the above, it can be seen that:

the utility model aims at the technical problems that: in a denitrification device used for traditional landfill leachate treatment, biochemical treatment is a main pollutant removal step, and carbon source equipment is required to be added to ensure that the C/N ratio of the landfill leachate maintains biochemical reaction, so that the device occupies more space and has higher cost; the technical scheme of each embodiment is adopted. Meanwhile, the implementation process of the technical scheme is as follows:

1. the inoculated sludge is activated sludge in an aeration tank of a landfill leachate treatment plant, filling and film forming are carried out by intermittent stuffy exposure and continuous water inflow with small flow, and then sludge acclimation is carried out by gradually increasing the raw water leachate adding proportion; the DO of the anoxic tank is controlled to be 0.5mg/L, the DO of the aerobic tank is controlled to be 2-3mg/L, and the PH is controlled to be 8.

1) And (3) filling and film forming, namely gradually lifting the load to continuously flow into the water and film forming by adding leachate with five percent concentration as water, and when the surface of the filling is provided with a stable biological film and the ammonia nitrogen and the cod of the effluent water are stable to seventy percent, indicating that film forming is successful.

2) And (3) sludge acclimation, wherein the proportion of percolate is gradually increased from ten percent to one hundred percent, so that the concentration can be increased when the removal rate is stable.

2. After the device runs stably, proper anaerobic ammonia oxidation bacterial sludge is added into the anoxic two zone 23, a carbon source is not added, and only the carbon source remained in the previous stage is used, so that the denitrification process can be stopped at the reduction of NO when the electron donor is insufficient by denitrifying bacteria ₂ ^- The nitrite is accumulated, an anaerobic ammonia oxidation matrix is provided, a test water sample is extracted for detection, judgment is carried out according to the change of the concentration of the detected nitrite and nitrate nitrogen, when the loss of ammonia nitrogen is detected in an anoxic zone and a reddish brown community can be observed on a filler, an auxiliary microorganism detection means can detect the abundance of the anaerobic ammonia oxidation genus, and the start-up of a short-cut denitrification anaerobic ammonia oxidation system is successful;

1) Anaerobic ammonia oxidation seed mud is added into the anoxic second zone 23, and the denitrification contribution rate of anaerobic ammonia oxidation and denitrification in the anoxic second zone 23 is judged by detecting the concentration of each pollutant of water entering and exiting the anoxic second zone 23.

3. The reflux ratio of the anaerobic zone returned from the aerobic zone was 200%, and the reflux ratio of the sludge returned from the bottom of the secondary sedimentation tank 3 to the anoxic zone 21 was 100%.

4. Sludge is discharged through a sludge discharge pipe 15, the sum of the suspended sludge concentration and the filler sludge concentration in the reactor 2 is kept at 3500mg/L, and the sludge age is controlled at 25d.

Through above-mentioned setting, this application must solve above-mentioned technical problem, simultaneously, realizes following technical effect:

through the cooperation design of a plurality of structures, the device can carry out denitrification treatment on garbage leachate, the concentration of sludge in the system can be maintained to the maximum extent through the reactor 2, the sludge loss is prevented, the residual sludge is less, and the removal rate of pollutants can be improved; the carbon source equipment in the traditional device is removed, the carbon source is not added, the occupied space of the device is reduced, and meanwhile, the required cost is reduced; in the anoxic second zone 23, the co-denitrification in one zone is realized through heterotrophic denitrification of denitrifying bacteria and autotrophic denitrification of anaerobic ammonia oxidation bacteria, so that the aim of high-efficiency deep denitrification is fulfilled.

Through adding k3 polyethylene suspension filler, an attachment condition can be better provided for the proliferation of anaerobic ammonia oxidizing bacteria; by adopting the addition of the suspended filler, compared with the reactor 2 in the prior art, a filler bracket is not required to be added, and the stirring and the maintenance of aeration equipment are convenient.

The foregoing has shown and described the basic principles, principal features and advantages of the utility model. It will be understood by those skilled in the art that the present utility model is not limited to the embodiments described above, and that the above embodiments and descriptions are merely illustrative of the principles of the present utility model, and various changes and modifications may be made therein without departing from the spirit and scope of the utility model, which is defined by the appended claims. The scope of the utility model is defined by the appended claims and equivalents thereof.

Claims (7)

1. The novel garbage leachate denitrification device is characterized by comprising a water tank (1), a reactor (2) and a secondary sedimentation tank (3), wherein an anoxic first region (21), an aerobic first region (22), an anoxic second region (23) and an aerobic second region (24) are sequentially arranged in the reactor (2) from one end to the other end, an overflow port I (8) is formed in the lower end between the anoxic first region (21) and the aerobic first region (22), and the anoxic first region (21) and the aerobic first region (22) are communicated through the overflow port I (8); an overflow port II (9) is formed in the upper part between the aerobic first region (22) and the anoxic second region (23), and the aerobic first region (22) and the anoxic second region (23) are communicated through the overflow port II (9); an overflow port III (10) is formed in the lower end between the anoxic second zone (23) and the aerobic second zone (24), and the anoxic second zone (23) and the aerobic second zone (24) are communicated through the overflow port III (10);

a water inlet port (11) is formed in one side of the anoxic first zone (21), the water tank (1) is connected with the water inlet port (11) through a connecting pipeline (6), a first peristaltic pump (7) is arranged on the connecting pipeline (6), the secondary sedimentation tank (3) is fixedly connected with the reactor (2), the secondary sedimentation tank (3) is positioned at one end close to the aerobic second zone (24), and the secondary sedimentation tank (3) is used for separating mud from water;

the inside of the anoxic first zone (21) and the anoxic second zone (23) are respectively provided with an adjustable speed stirrer for stirring the filler;

the bottoms of the reactor (2) and the secondary sedimentation tank (3) are provided with reflux structures for refluxing nitrifying liquid and sludge;

the bottom of the reactor (2) is also provided with an aeration structure for providing dissolved oxygen in the reactor (2).

2. The novel landfill leachate denitrification device according to claim 1, wherein an overflow pipe (31) is vertically arranged inside the secondary sedimentation tank (3), the overflow pipe (31) is communicated with the inside of the anoxic secondary area (23) through a branch pipe, an overflow frame (32) is arranged inside the secondary sedimentation tank (3) and at a position above the overflow pipe (31), the overflow frame (32) is fixedly connected with the secondary sedimentation tank (3) through a fixing plate, a separation plate (33) is arranged at the position, corresponding to the overflow frame (32), of the outer side of the secondary sedimentation tank (3), a guide plate (34) is fixed at the position, corresponding to the overflow frame (32), of the inner bottom end of the secondary sedimentation tank (3), below the overflow pipe (31), and a sludge discharge pipe (15) is fixed at the bottom of the secondary sedimentation tank (3).

3. The novel landfill leachate denitrification device according to claim 1, wherein the speed-adjustable stirrer comprises a stirring rod (4), the upper portion of the stirring rod (4) is rotationally connected with the reactor (2) through a mounting frame, a plurality of spiral blades (5) are fixed on the lower portion of the stirring rod (4), and the top end of the stirring rod (4) is connected with a speed-adjustable motor.

4. The novel landfill leachate denitrification device according to claim 1, wherein the reflux structure comprises a first reflux pipe (12), a second reflux pipe (13) and a third reflux pipe (14), one end of the first reflux pipe (12) is communicated with the bottom of the anoxic first area (21), and the other end of the first reflux pipe (12) is communicated with the bottom of the secondary sedimentation tank (3); one end of the second return pipe (13) is communicated with the bottom of the anoxic first zone (21), and the other end of the second return pipe (13) is communicated with the bottom of the aerobic first zone (22); one end of the return pipe III (14) is communicated with the bottom of the anoxic second zone (23), and the other end of the return pipe III (14) is communicated with the bottom of the aerobic second zone (24); and the first return pipe (12), the second return pipe (13) and the third return pipe (14) are respectively provided with a second peristaltic pump.

5. The novel landfill leachate denitrification device according to claim 1, wherein the aeration structure comprises an aeration main pipe (16), one end of the aeration main pipe (16) is provided with two first extension pipes, one end of the aeration main pipe (16) is far away from the two first extension pipes and extends to the inside of an aerobic first zone (22), the other end of the aeration main pipe (16) is provided with a second extension pipe, one end of the second extension pipe far away from the aeration main pipe (16) extends to the inside of an anoxic second zone (23), one ends of the two first extension pipes and the second extension pipes far away from the aeration main pipe (16) are both fixed with aeration discs (17), and the aeration main pipe (16) is connected with an aeration pump through a branch pipe.

6. A new landfill leachate denitrification device according to claim 3, wherein the number of screw blades (5) is two.

7. The novel landfill leachate denitrification device according to claim 1, wherein the water inlet port (11) is provided with a check valve.

Images