A device for biological denitrification of landfill leachate

Abstract

This utility model discloses a biological denitrification device for landfill leachate, belonging to the field of landfill leachate treatment technology. It includes a denitrification tank with an arc-shaped bottom groove at the bottom of its inner cavity. An aeration mechanism and a scraping mechanism are installed on the denitrification tank. A filter screen is fixedly fitted inside the inner cavity of the denitrification tank. A reciprocating screw is rotatably connected to the upper part of the inner cavity of the denitrification tank, and a sliding rod is fixedly fitted to the upper part of the inner cavity of the denitrification tank. A movable seat is threaded onto the outer side of the reciprocating screw, and the movable seat and the sliding rod are movably fitted together. In this utility model, the reciprocating screw, sliding rod, movable seat, first scraper, and first motor work together to drive the first scraper to move reciprocally. The first scraper scrapes down the sludge from the inner walls of the denitrification tank and the arc-shaped bottom groove. Simultaneously, the reciprocating screw, sliding rod, and movable seat are located at the top of the inner cavity of the denitrification tank and are not affected by the sludge.

Description

Technical Field

[0001] This utility model relates to the field of landfill leachate treatment technology, and more specifically, to a landfill leachate biological denitrification device. Background Technology

[0002] Landfill leachate is a highly concentrated organic wastewater originating from the moisture contained in the landfill waste itself, rainwater and snowmelt entering the landfill, and other water sources. This wastewater is formed after deducting the saturated water-holding capacity of the waste and cover layers, and passing through both layers. Landfill leachate contains large amounts of nitrogen compounds, such as ammonia nitrogen and nitrates. If directly discharged into water bodies, these nitrogen compounds can lead to eutrophication, causing algal blooms and other problems that severely impact aquatic ecosystems. Therefore, denitrification treatment is necessary.

[0003] A search revealed that utility model patent CN222312873U discloses a short-range deep biological denitrification device for urban landfill leachate. The device includes a denitrification tank, an aeration device located at the outer end of the tank, and an aeration pipe installed at the bottom of the tank and connected to the output of the aeration device. A rotating shaft is rotatably mounted inside the tank, parallel to its width. An L-shaped scraper is fixed to the bottom of the shaft, its bottom fitting against the inner bottom of the tank. A rotating movement mechanism is located at one end of the shaft. This patent utilizes a linear guide groove along the length of the inner wall of the tank, with a rack inside. Combined with a rotating movement mechanism consisting of a rotary motor, a reciprocating screw, a slider, and gears at the shaft end, the device can simultaneously control the rotation and reciprocating movement of the shaft during cleaning, ensuring uniform cleaning of the sludge at the bottom of the tank and improving the cleaning effect.

[0004] However, the aforementioned patents have the following shortcomings: the sludge generated during the denitrification of landfill leachate can easily clog the aeration pipes at the bottom, and the reciprocating screw, rack, and gears can also come into contact with the sludge, affecting their transmission efficiency. Therefore, we propose a biological denitrification device for landfill leachate. Utility Model Content

[0005] In view of the problems existing in the prior art, the purpose of this utility model is to provide a biological denitrification device for landfill leachate.

[0006] To solve the above problems, the present invention adopts the following technical solution:

[0007] A biological denitrification device for landfill leachate includes a denitrification tank. The bottom of the inner cavity of the denitrification tank has an arc-shaped groove. An aeration mechanism and a scraping mechanism are installed on the denitrification tank. A filter screen is fixedly fitted inside the inner cavity of the denitrification tank. A reciprocating screw is rotatably connected to the upper part of the inner cavity of the denitrification tank. A sliding rod is fixedly fitted to the upper part of the inner cavity of the denitrification tank. A movable seat is threaded onto the outer side of the reciprocating screw. The movable seat and the sliding rod are movably fitted together. First scrapers are fixedly connected to the bottom surfaces of both ends of the movable seat. The outer side of a scraper is in contact with the inner wall of the denitrification box and the arc-shaped bottom trough. A first motor is fixedly installed on the other side of the denitrification box. The output shaft of the first motor is connected to the end of a reciprocating screw through a coupling. A sludge discharge pipe is provided on one side of the denitrification box. A third motor is fixedly installed on the other side of the denitrification box. The output shaft of the third motor extends into the inner cavity of the arc-shaped bottom trough and is fixedly connected to a spiral conveyor rod through a coupling. The end of the spiral conveyor rod penetrates into the inner cavity of the sludge discharge pipe. A plug cap is threaded onto the end of the sludge discharge pipe.

[0008] As a preferred embodiment of this utility model, the aeration mechanism includes an aeration fan fixedly installed on one side of the denitrification box, an aeration pipe fixedly connected to the output end of the aeration fan, and an aeration pipe fixedly sleeved to the inner cavity of the denitrification box and having multiple aeration holes.

[0009] As a preferred embodiment of this utility model, the scraping mechanism includes a second motor fixedly installed on the other side of the denitrification chamber. The output shaft of the second motor extends into the inner cavity of the denitrification chamber and is fixedly connected to a second scraper. The output shaft of the second motor passes through the middle of the filter screen, and the end face of the second scraper is in contact with the end face of the filter screen.

[0010] As a preferred embodiment of this utility model, the top of the denitrification box is provided with a liquid inlet, and a drain pipe is fixedly connected to the other side of the denitrification box.

[0011] In a preferred embodiment of this utility model, the rotating shaft of the spiral conveying rod passes through the lower part of the filter screen, and a third scraper is fixedly connected to the side of the rotating shaft of the spiral conveying rod, with the end face of the third scraper and the end face of the filter screen being in contact.

[0012] As a preferred embodiment of this utility model, the side of the spiral conveyor rod is respectively attached to the bottom surface of the arc-shaped bottom groove cavity and the inner wall of the mud discharge pipe.

[0013] Compared with existing technologies, the advantages of this utility model are:

[0014] (1) In this utility model, the first scraper is driven to move back and forth by the cooperation of the reciprocating screw, slide bar, moving seat, first scraper and first motor. The first scraper scrapes down the sludge on the inner wall of the denitrification box and the arc-shaped bottom trough. At the same time, the reciprocating screw, slide bar and moving seat are located at the top of the inner cavity of the denitrification box and will not be affected by the sludge.

[0015] (2) In this utility model, the leachate in the denitrification chamber is aerated by the cooperation of the aeration blower, aeration pipe and aeration hole. At the same time, the aeration pipe is placed in the middle of the denitrification chamber, so that the sludge produced by the denitrification of leachate will not block the aeration hole on the side of the aeration pipe. Attached Figure Description

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

[0017] Figure 2 This is a schematic diagram of the overall structure of the back of this utility model;

[0018] Figure 3 This is a schematic cross-sectional view of the present invention;

[0019] Figure 4 This is a cross-sectional schematic diagram of the denitrification chamber of this utility model;

[0020] Figure 5 This is a schematic diagram of the structure of the water filter screen of this utility model.

[0021] Explanation of the labels in the diagram:

[0022] 1. Denitrification box; 2. Arc-shaped bottom trough; 3. Filter screen; 4. Reciprocating screw; 5. Slide rod; 6. Moving seat; 7. First scraper; 8. First motor; 9. Sludge discharge pipe; 10. Third motor; 11. Screw conveyor; 12. Pipe plug; 13. Aeration mechanism; 14. Scraping mechanism; 15. Liquid inlet; 16. Liquid discharge pipe; 17. Second motor; 18. Second scraper; 19. Third scraper; 20. Aeration blower; 21. Aeration pipe; 22. Aeration hole. Detailed Implementation

[0023] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present utility model, not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the scope of protection of the present utility model.

[0024] In the description of this utility model, it should be noted that the terms "upper," "lower," "inner," "outer," "top / bottom," etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0025] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installed," "equipped with," "sleeved / connected," "connected," etc., should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral 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 a connection within two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0026] Example 1:

[0027] Please see Figure 1-5 A biological denitrification device for landfill leachate includes a denitrification tank 1, an arc-shaped bottom groove 2 at the bottom of the inner cavity of the denitrification tank 1, an aeration mechanism 13 on the denitrification tank 1, a scraping mechanism 14 on the denitrification tank 1, a filter screen 3 fixedly sleeved inside the inner cavity of the denitrification tank 1, a reciprocating screw 4 rotatably connected to the upper part of the inner cavity of the denitrification tank 1, a sliding rod 5 fixedly sleeved to the upper part of the inner cavity of the denitrification tank 1, a movable seat 6 threadedly sleeved on the outer side of the reciprocating screw 4, the movable seat 6 and the sliding rod 5 movably sleeved, and first scrapers 7 fixedly connected to the bottom surfaces of both ends of the movable seat 6. The outer side of 7 is in contact with the inner wall of the denitrification box 1 and the arc-shaped bottom groove 2 respectively. The first motor 8 is fixedly installed on the other side of the denitrification box 1. The output shaft of the first motor 8 is connected to the end of the reciprocating screw 4 through a coupling. A mud discharge pipe 9 is provided on one side of the denitrification box 1. A third motor 10 is fixedly installed on the other side of the denitrification box 1. The output shaft of the third motor 10 extends into the inner cavity of the arc-shaped bottom groove 2 and is fixedly connected to the spiral conveyor rod 11 through a coupling. The end of the spiral conveyor rod 11 penetrates into the inner cavity of the mud discharge pipe 9. A plug cap 12 is threadedly installed at the end of the mud discharge pipe 9.

[0028] In this embodiment, the sliding between the slide bar 5 and the movable seat 6 limits the movable seat 6 and the first scraper 7, so that the first scraper 7 can only move along the axial direction of the reciprocating screw 4, so as to scrape the inner wall of the denitrification box 1 using the first scraper 7.

[0029] For details, please refer to Figure 1 , Figure 2 and Figure 4 The aeration mechanism 13 includes an aeration fan 20 fixedly installed on one side of the denitrification box 1. An aeration pipe 21 is fixedly connected to the output end of the aeration fan 20. The end of the aeration pipe 21 is fixedly sleeved into the inner cavity of the denitrification box 1 and has multiple aeration holes 22.

[0030] In this embodiment, the aeration blower 20 draws external air into the inner cavity of the aeration pipe 21, and the air in the inner cavity of the aeration pipe 21 is blown into the leachate in the inner cavity of the denitrification box 1.

[0031] For details, please refer to Figure 1 , Figure 2 and Figure 4 The scraping mechanism 14 includes a second motor 17 fixedly installed on the other side of the denitrification box 1. The output shaft of the second motor 17 extends into the inner cavity of the denitrification box 1 and is fixedly connected to a second scraper 18. The output shaft of the second motor 17 passes through the middle of the filter screen 3, and the end face of the second scraper 18 is in contact with the end face of the filter screen 3.

[0032] In this embodiment, the second motor 17 drives the second scraper 18 to rotate, and the second scraper 18 scrapes off the sludge attached to the end face of the filter screen 3, so as to avoid the filter screen 3 from becoming blocked and affecting the discharge of leachate.

[0033] For details, please refer to Figure 2 The top of the denitrification tank 1 is provided with a liquid inlet 15, and a drain pipe 16 is fixedly connected to the other side of the denitrification tank 1.

[0034] In this embodiment, landfill leachate is introduced into the inner cavity of denitrification tank 1 through inlet 15, and the denitrified leachate is discharged through drain pipe 16.

[0035] For details, please refer to Figure 5 The rotating shaft of the spiral conveyor rod 11 passes through the lower part of the filter screen 3. A third scraper 19 is fixedly connected to the side of the rotating shaft of the spiral conveyor rod 11. The end face of the third scraper 19 is in contact with the end face of the filter screen 3.

[0036] In this embodiment, the third scraper 19 is used to scrape the bottom surface of the filter screen 3 to prevent the bottom surface of the filter screen 3 from becoming blocked.

[0037] For details, please refer to Figure 3 and Figure 4 The sides of the spiral conveyor rod 11 are respectively attached to the bottom surface of the inner cavity of the arc-shaped bottom groove 2 and the inner wall of the mud discharge pipe 9.

[0038] In this embodiment, the rotation of the spiral conveyor rod 11 is ensured to drive the sludge in the inner cavity of the arc-shaped bottom groove 2 to be smoothly discharged from the sludge discharge pipe 9.

[0039] Working Principle: During operation, the leachate to be treated is first introduced into the inner cavity of the denitrification tank 1 through the inlet 15. The pre-set microorganisms in the denitrification tank 1 denitrify the leachate. Simultaneously, the aeration blower 20 draws external air into the inner cavity of the aeration pipe 21, causing the aeration holes 22 to spray air into the leachate, ensuring the quality of denitrification by the microorganisms. Then, the denitrified leachate passes through the filter screen 3 and moves to one end of the inner cavity of the denitrification tank 1, and is discharged through the drain pipe 16. At the same time, the second motor 17 is started, driving the second scraper 18 to rotate. The second scraper 18 scrapes the end face of the filter screen 3 to prevent clogging caused by sludge generated during denitrification. Then, when the sludge is discharged, the first motor 8 is started to drive the reciprocating screw 4 to rotate. Through the threaded engagement between the reciprocating screw 4 and the moving seat 6, the moving seat 6 is driven to move back and forth along the axial direction of the reciprocating screw 4. The first scraper 7 scrapes off the sludge attached to the inner wall of the denitrification box 1 and the arc-shaped bottom trough 2. Under the action of the sludge's own weight, it moves to the bottom of the inner cavity of the arc-shaped bottom trough 2. Finally, the plug cap 12 at the end of the sludge discharge pipe 9 is removed, and the third motor 10 is started to drive the screw conveyor 11 and the third scraper 19 to rotate. The screw conveyor 11 scrapes the sludge at the end of the filter screen 3. The rotation of the screw conveyor 11 drives the sludge at the bottom of the inner cavity of the arc-shaped bottom trough 2 to move, so that the sludge is discharged from the sludge discharge pipe 9.

[0040] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model based on the technical solution and its improved concept should be covered within the protection scope of the present utility model.

Claims

1. A device for biological denitrification of landfill leachate, comprising a denitrification tank (1), characterised in that: The bottom of the denitrification box (1) is provided with an arc-shaped bottom groove (2). An aeration mechanism (13) is provided on the denitrification box (1). A scraping mechanism (14) is provided on the denitrification box (1). A filter screen (3) is fixedly sleeved in the inner cavity of the denitrification box (1). A reciprocating screw (4) is rotatably connected to the upper part of the inner cavity of the denitrification box (1). A sliding rod (5) is fixedly sleeved in the upper part of the inner cavity of the denitrification box (1). A movable seat (6) is threaded on the outer side of the reciprocating screw (4). The movable seat (6) and the sliding rod (5) are movably sleeved. The bottom surfaces of the two ends of the movable seat (6) are respectively fixedly connected with first scrapers (7). The outer sides of the two first scrapers (7) are respectively The inner walls of the denitrification box (1) and the arc-shaped bottom groove (2) are in contact with each other. A first motor (8) is fixedly installed on the other side of the denitrification box (1). The output shaft of the first motor (8) is connected to the end of the reciprocating screw (4) through a coupling. A sludge discharge pipe (9) is provided on one side of the denitrification box (1). A third motor (10) is fixedly installed on the other side of the denitrification box (1). The output shaft of the third motor (10) extends into the inner cavity of the arc-shaped bottom groove (2) and is fixedly connected to a spiral conveyor rod (11) through a coupling. The end of the spiral conveyor rod (11) penetrates into the inner cavity of the sludge discharge pipe (9). A plug cap (12) is threaded onto the end of the sludge discharge pipe (9).

2. The landfill leachate biological denitrification device according to claim 1, characterized in that: The aeration mechanism (13) includes an aeration fan (20) fixedly installed on one side of the denitrification box (1). The output end of the aeration fan (20) is fixedly connected to an aeration pipe (21). The end of the aeration pipe (21) is fixedly sleeved into the inner cavity of the denitrification box (1) and has multiple aeration holes (22).

3. The landfill leachate biological denitrification device according to claim 1, characterized in that: The scraping mechanism (14) includes a second motor (17) fixedly installed on the other side of the denitrification box (1). The output shaft of the second motor (17) extends into the inner cavity of the denitrification box (1) and is fixedly connected to a second scraper (18). The output shaft of the second motor (17) passes through the middle of the filter screen (3). The end face of the second scraper (18) and the end face of the filter screen (3) are in contact.

4. The landfill leachate biological denitrification device according to claim 1, characterized in that: The top of the denitrification tank (1) is provided with a liquid inlet (15), and a drain pipe (16) is fixedly connected to the other side of the denitrification tank (1).

5. The landfill leachate biological denitrification device according to claim 1, characterized in that: The rotating shaft of the spiral feed rod (11) passes through the lower part of the filter screen (3). A third scraper (19) is fixedly connected to the side of the rotating shaft of the spiral feed rod (11). The end face of the third scraper (19) is in contact with the end face of the filter screen (3).

6. The landfill leachate biological denitrification device according to claim 1, characterized in that: The side of the spiral conveyor rod (11) is in contact with the bottom surface of the inner cavity of the arc-shaped bottom groove (2) and the inner wall of the mud discharge pipe (9).

Images