Efficient biochemical denitrification ZMHEBT device for landfill leachate treatment

Abstract

The utility model belongs to the technical field of efficient biochemical denitrification devices, and particularly relates to an efficient biochemical denitrification ZMHEBT device for landfill leachate treatment, which comprises a circulating pool, one side of the circulating pool is connected with a water pool, the inside of the circulating pool is connected with a first reaction mechanism, the inside of the water pool is connected with a second reaction mechanism, and the second reaction mechanism is connected with a third reaction mechanism. According to the utility model, the low-speed water impeller, the first reaction mechanism and the second reaction mechanism are coordinated and matched, so that the ammonia nitrogen nitration step is optimized, only ammonia nitrogen needs to be nitrated into nitrite, and the process has double energy-saving advantages; oxygen required by further nitrification of nitrite and an external carbon source required in the denitrification process are saved, so that the power consumption and the chemical consumption are effectively reduced; and on the other hand, as the ammonia nitrogen is directly subjected to anaerobic ammonia oxidation reaction with the nitrite to generate nitrogen, efficient removal of nitrogen from the wastewater is realized, and oxygen required by ammonia nitrogen nitrification and a carbon source required by denitrification are further saved.

Description

Technical Field

[0001] This utility model belongs to the technical field of high-efficiency biochemical denitrification devices, specifically relating to a high-efficiency biochemical denitrification ZMHEBT device for landfill leachate treatment. Background Technology

[0002] Landfill leachate mainly originates from the water content of the landfill itself, natural precipitation, infiltration of groundwater and surface water, and water produced by the biochemical reactions of the landfill. Due to the combined effects of these factors, landfill leachate is characterized by its complex composition, high concentration of pollutants, and high content of organic pollutants, posing a potential threat to the environment and human health.

[0003] The current traditional biochemical denitrification device works on the following mechanism: under aerobic conditions, nitrite-oxidizing bacteria denitrify NH4+. + Nitrification occurs when nitrite is converted to nitrite by nitrifying bacteria; then, under anaerobic conditions, denitrifying bacteria reduce the nitrate or nitrite produced during nitrification to nitrogen gas.

[0004] Traditional biological denitrification devices require two steps of nitrification to convert ammonia nitrogen into nitrate nitrogen, followed by two steps of denitrification to convert it into nitrogen gas. This process involves long reaction steps and requires a long reaction time. The nitrification process consumes oxygen, resulting in high energy consumption. The denitrification process requires a carbon source. When the BOD5 / TN ratio in the wastewater is less than 3, a carbon source needs to be added. If the concentration of ammonia nitrogen in the wastewater is high, but the concentration of organic matter is low, a large amount of carbon source often needs to be added, resulting in high costs.

[0005] In this patent, ZM represents the abbreviation of the first letters of the applicant's name "Zhongmeng" in Chinese, and HEBT is the abbreviation of the English translation of High Efficient Bioreactor. Utility Model Content

[0006] The purpose of this invention is to provide a high-efficiency biochemical denitrification ZMHEBT device for landfill leachate treatment. This addresses the problems of existing traditional biochemical denitrification devices, which require two steps of nitrification (from ammonia nitrogen to nitrate nitrogen) followed by two steps of denitrification (from nitrogen gas), resulting in long reaction steps and time. Furthermore, the nitrification process consumes oxygen, leading to high energy consumption. The denitrification process requires a carbon source; when BOD5 / TN < 3 in the wastewater, a carbon source needs to be added. If the wastewater has a high ammonia nitrogen concentration but a low organic matter concentration, a large amount of carbon source often needs to be added, resulting in high costs.

[0007] To achieve the above objectives, this utility model provides the following technical solution: a high-efficiency biochemical denitrification ZMHEBT device for landfill leachate treatment, comprising a circulating tank, a water tank connected to one side of the circulating tank, a first reaction mechanism connected inside the circulating tank, a second reaction mechanism connected inside the water tank, a low-speed flow promoter installed inside the circulating tank, and an inlet pipe connected to the surface of the circulating tank. The first reaction mechanism consists of an anaerobic ammonia oxidation zone, a denitrification zone, and a short-cut nitrification zone. The second reaction mechanism consists of a nitrification zone. The anaerobic ammonia oxidation zone is lined with biological packing material. Aeration devices are installed on the inner walls of the short-cut nitrification zone and the nitrification zone. A blower connected to the aeration device is installed on one side of the circulating tank. A sedimentation tank is provided on one side of the two reaction mechanisms. A membrane feed pump is provided for the sedimentation tank and the second reaction mechanism. The sedimentation tank, the membrane feed pump, and the second reaction mechanism are connected by a pipeline. A return pipe is connected between the sedimentation tank and the circulation tank. A drain pipe is connected to the side wall of the sedimentation tank. A filter membrane is installed inside the sedimentation tank. A support plate is connected to the bottom end of the filter membrane. Two threaded rods are rotatably installed inside the sedimentation tank. A fixing plate for connecting the threaded rods is connected to the top of the sedimentation tank. A fixing block is connected inside the sedimentation tank. A rotating shaft is connected through the surface of the fixing block. A servo motor is installed on the side wall of the sedimentation tank. A worm gear is fixedly connected to the surface of the rotating shaft. A worm wheel is fixedly connected to the surface of the threaded rod.

[0008] In a preferred embodiment of the ZMHEBT device for efficient biochemical denitrification in landfill leachate treatment according to this invention, the threaded rod thread penetrates the surface of the support plate.

[0009] In a preferred embodiment of the high-efficiency biochemical denitrification ZMHEBT device for landfill leachate treatment according to this invention, the output shaft of the servo motor is connected to the rotating shaft.

[0010] In a preferred embodiment of the ZMHEBT device for high-efficiency biochemical denitrification in landfill leachate treatment according to this invention, the worm gear is meshed with and connected to the worm wheel.

[0011] In a preferred embodiment of the high-efficiency biochemical denitrification ZMHEBT device for landfill leachate treatment according to this utility model, the two threaded rods have the same thread direction, and the two threaded rods rotate in the same direction through a worm and a worm wheel.

[0012] In a preferred embodiment of the ZMHEBT device for high-efficiency biochemical denitrification in landfill leachate treatment according to this invention, the threaded rod can be linked with the worm gear through a worm wheel to form a gear linkage.

[0013] As a preferred embodiment of the high-efficiency biochemical denitrification ZMHEBT device for landfill leachate treatment according to this utility model, the support plate can be connected to the sedimentation tank in a lifting manner through a threaded rod, worm gear, worm wheel and rotating shaft.

[0014] Compared with the prior art, the beneficial effects of this utility model are:

[0015] Through the coordinated operation of the low-speed propeller, the first reaction mechanism, and the second reaction mechanism, the ammonia nitrogen nitrification step in the nitrification and denitrification process of landfill leachate is optimized, requiring only the ammonia nitrogen to be nitrified to the nitrite stage. Subsequently, the ammonia nitrogen and nitrite in the wastewater react with anaerobic ammonia oxidizing bacteria to generate nitrogen gas. This process has dual energy-saving advantages: firstly, it saves the oxygen required for further nitrite nitrification and the external carbon source required for denitrification, thus effectively reducing power and chemical consumption; secondly, because ammonia nitrogen directly reacts with nitrite in an anaerobic ammonia oxidation reaction to generate nitrogen gas, it achieves efficient nitrogen removal from the wastewater, further saving the oxygen required for ammonia nitrogen nitrification and the carbon source required for denitrification. Furthermore, in terms of equipment maintenance, the cooperation between the threaded rod, worm gear, worm wheel, and rotating shaft allows the support plate to smoothly move the filter membrane out of the sedimentation tank, greatly facilitating filter membrane replacement. This convenient filter membrane replacement method significantly improves the ease of equipment maintenance and ensures the long-term stable operation of the equipment. Attached Figure Description

[0016] The accompanying drawings are provided to further illustrate the present invention and form part of the specification. They are used together with the embodiments of the present invention to explain the present invention, but do not constitute a limitation thereof. In the drawings:

[0017] Figure 1 This is a schematic diagram of the main structure of the present utility model;

[0018] Figure 2 This is a schematic diagram of the sedimentation tank structure of this utility model;

[0019] Figure 3 This is a cross-sectional view of the sedimentation tank structure of this utility model;

[0020] Figure 4 This utility model Figure 3 A magnified structural diagram at point A in the diagram.

[0021] In the diagram: 1. Circulating tank; 2. Anaerobic ammonia oxidation zone; 3. Denitrification zone; 4. Short-cut nitrification zone; 5. Nitrification zone; 6. Flow promoter; 7. Biological packing material; 8. Aeration device; 9. Blower; 10. Inlet pipe; 11. Membrane inlet pump; 12. Sedimentation tank; 13. Drain pipe; 14. Return pipe; 15. Filter membrane; 16. Support plate; 17. Threaded rod; 18. Fixing block; 19. Rotating shaft; 20. Servo motor; 21. Worm gear; 22. Worm wheel; 23. First reaction mechanism; 24. Second reaction mechanism; 25. Water tank; 26. Fixing plate. Detailed Implementation

[0022] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0023] Please see Figures 1-4 This utility model provides the following technical solution: A high-efficiency biochemical denitrification ZMHEBT device for landfill leachate treatment, comprising a circulating tank 1, a water tank 25 connected to one side of the circulating tank 1, a first reaction mechanism 23 connected inside the circulating tank 1, a second reaction mechanism 24 connected inside the water tank 25, a low-speed flow promoter 6 installed inside the circulating tank 1, and an inlet pipe 10 connected to the surface of the circulating tank 1. The first reaction mechanism 23 consists of an anaerobic ammonia oxidation zone 2, a denitrification zone 3, and a short-cut nitrification zone 4. The second reaction mechanism 24 consists of a nitrification zone 5. The anaerobic ammonia oxidation zone 2 is covered with biological packing material 7. Aeration devices 8 are installed on the inner walls of the short-cut nitrification zone 4 and the nitrification zone 5. A blower 9 connected to the aeration device 8 is installed on one side of the circulating tank 1. A sedimentation tank 1 is provided on one side of the second reaction mechanism 24. 2. A membrane feed pump 11 is provided in the sedimentation tank 12 and the second reaction mechanism 24. The sedimentation tank 12, the membrane feed pump 11 and the second reaction mechanism 24 are connected by a pipe. A return pipe 14 is connected between the sedimentation tank 12 and the circulation tank 1. A drain pipe 13 is connected to the side wall of the sedimentation tank 12. A filter membrane 15 is installed inside the sedimentation tank 12. A support plate 16 is connected to the bottom end of the filter membrane 15. Two threaded rods 17 are rotatably installed inside the sedimentation tank 12. A fixing plate 26 for connecting the threaded rods 17 is connected to the top of the sedimentation tank 12. A fixing block 18 is connected inside the sedimentation tank 12. A rotating shaft 19 is connected through the surface of the fixing block 18. A servo motor 20 is installed on the side wall of the sedimentation tank 12. A worm gear 21 is fixedly connected to the surface of the rotating shaft 19. A worm wheel 22 is fixedly connected to the surface of the threaded rod 17.

[0024] In practical use, the high-efficiency biological denitrification device consists of a circulating tank 1 and a water tank 25. The circulating tank 1 is a double-channel circulating channel, divided into an anaerobic ammonia oxidation zone 2, a denitrification zone 3, and a short-cut nitrification zone 4. The other water tank 25 is the nitrification zone 5, which shares an arc-shaped partition wall with the circulating tank 1. Low-speed propellers 6 are installed in the circulating tank 1. The low-speed propellers 6 are generally located at both ends or in the middle of the straight section of the channel. The power and number of low-speed propellers 6 are calculated and determined based on the water depth, single channel width, and straight section length of the channel. Biological packing material 7 is laid in the anaerobic ammonia oxidation zone 2. The biological packing material 7 is evenly distributed across the entire flow end face and maintains a certain porosity. Aeration devices 8 are installed at the bottom of the short-cut nitrification zone 4 and the nitrification zone 5. Aeration devices 8 are supplied with air by a blower 9 to provide the necessary oxygen to promote the nitrification reaction.

[0025] Preferably, the threaded rod 17 has its threads penetrating the surface of the support plate 16. The output shaft of the servo motor 20 is connected to the rotating shaft 19. The worm gear 21 is meshed with the worm wheel 22. The two threaded rods 17 have the same thread direction, and the two threaded rods 17 rotate in the same direction through the worm gear 21 and the worm wheel 22. The threaded rods 17 and worm gear 21 can form a gear linkage through the worm wheel 22. The support plate 16 can be connected to the sedimentation tank 12 in a lifting manner through the threaded rods 17, worm gear 21, worm wheel 22 and rotating shaft 19.

[0026] In practical use, the operator turns on the power to the servo motor 20 and starts it. At this time, the output shaft of the servo motor 20 begins to rotate, driving the connected rotating shaft 19 to rotate as well. The rotation of the rotating shaft 19 further drives the worm gear 21 to rotate synchronously, and the rotation of the worm gear 21 drives the worm wheel 22 meshing with it to start rotating. As the worm wheel 22 rotates, the threaded rod 17 also rotates.

[0027] Under the rotation of the threaded rod 17, the support plate 16 moves along the threaded path on its surface. As the support plate 16 gradually rises, it pushes the filter membrane 15 smoothly out of the sedimentation tank 12. In this way, the operator can easily install and remove the filter membrane 15.

[0028] This convenient method of replacing the filter membrane 15 greatly improves the ease of equipment maintenance, avoiding the problem of difficult disassembly and assembly caused by the space limitation of the filter membrane 15 being located inside the sedimentation tank 12. At the same time, it also ensures long-term stable operation of the equipment and extends its service life.

[0029] Working principle: Wastewater is fed into the circulation tank 1 through the inlet pipe 10 and then continuously circulates in the circulation tank 1 under the action of the low-speed propeller 6, with a flow velocity of not less than 0.3 m / s. The influent enters from the upstream section of the anaerobic ammonia oxidation zone 2, which is covered with biological packing material 7, where anaerobic ammonia oxidizing bacteria grow and attach. The short-cut nitrification liquid recirculated from the short-cut nitrification zone 4, along with the influent, enters the anaerobic ammonia oxidation zone 2 together under the action of the low-speed propeller 6, where they are thoroughly mixed and come into full contact with the anaerobic ammonia oxidizing bacteria attached to and growing on the biological packing material 7. The short-cut nitrification liquid contains a large amount of NO2. - Follow up on NH4 in the water + Anaerobic ammonia oxidation occurs under the action of anaerobic ammonia-oxidizing bacteria, producing nitrogen gas (N2) and nitrate (NO3). - The specific reaction formula is as follows:

[0030] 1NH4 + +1.32NO2 - +0.066HCO3 - +0.13H + →1.02N2+0.26NO3 - +0.066CH2O 0.5 N 0.15 +2.03H2O

[0031] The reaction mixture, along with the nitrification liquid returned from sedimentation tank 12, enters denitrification zone 3. Both liquids contain a certain amount of nitrate (NO3). - The low-speed impeller 6 mixes and agitates the wastewater, propelling it through the circulation tank 1; nitrate (NO3) - In denitrification zone 3, it is denitrified into nitrogen gas (N2), and the specific reaction formula is as follows:

[0032] 6NO3 - +2CH3OH→6NO2 - +2CO2+4H2O

[0033] 6NO2 - +3CH3OH→3N2+3CO2+3H2O+6OH -

[0034] Next, the wastewater enters the short-cut nitrification zone 4. An aeration device 8 is installed at the bottom of the short-cut nitrification zone 4. An external blower 9 aerates the wastewater in the short-cut nitrification zone 4. By controlling the oxygenation rate, the ammonia nitrogen (NH4+) in the wastewater is reduced. + Only a short-range nitration reaction occurs, and it is oxidized to nitrite (NO2). - The specific reaction formula is as follows:

[0035] 2NH4+ +3O2→2NO2 - +4H + +2H2O;

[0036] The short-range nitrification solution produced by the reaction contains a large amount of nitrite (NO2). - Then, it flows back to the anaerobic ammonia oxidation zone 2 along with the circulating tank 1.

[0037] A portion of the wastewater (short-cut nitrification liquid) from short-cut nitrification zone 4 enters nitrification zone 5. An aeration device 8 is installed at the bottom of nitrification zone 5, and an external blower 9 aerates the wastewater in nitrification zone 5. The short-cut nitrification liquid contains nitrite (NO2). - It is further nitrated to nitrate, and the specific reaction formula is as follows:

[0038] 2NO2 - +O2→2NO3 - ;

[0039] The effluent from nitrification zone 5 enters sedimentation tank 12 via membrane influent pump 11 for sludge-water separation. The activated sludge in the mixed liquor is intercepted by filter membrane 15 and then returned to denitrification zone 3 via return pipe 14. This maintains the sludge concentration in the ZMHEBT bioreactor and ensures the return liquid contains a certain amount of nitrate (NO3). - The wastewater is then returned to denitrification zone 3 for denitrification. After separation by filter membrane 15, the wastewater can be discharged in compliance with standards or undergo further advanced treatment. This high-efficiency biological nitrogen removal device achieves anaerobic ammonia oxidation, denitrification, short-cut nitrification, and nitrification reactions, optimizing the living environment of anaerobic ammonia oxidizing bacteria, denitrifying bacteria, and nitrifying bacteria, with stable operating performance. On the one hand, it saves the oxygen required for further nitrite nitrification and the external carbon source required for the denitrification process, thus effectively reducing power and chemical consumption; on the other hand, because ammonia nitrogen directly reacts with nitrite in an anaerobic ammonia oxidation reaction to generate nitrogen gas, it achieves efficient nitrogen removal from wastewater, further saving the oxygen required for ammonia nitrogen nitrification and the carbon source required for denitrification.

[0040] Next, the operator turns on the power to the servo motor 20 and starts it. At this time, the output shaft of the servo motor 20 begins to rotate, driving the connected rotating shaft 19 to rotate as well. The rotation of the rotating shaft 19 further drives the worm gear 21 to rotate synchronously, and the rotation of the worm gear 21 drives the worm wheel 22 meshing with it to start rotating. As the worm wheel 22 rotates, the threaded rod 17 also rotates.

[0041] Under the rotation of the threaded rod 17, the support plate 16 moves along the threaded path on its surface. As the support plate 16 gradually rises, it pushes the filter membrane 15 smoothly out of the sedimentation tank 12. In this way, the operator can easily install and remove the filter membrane 15.

[0042] This convenient method of replacing the filter membrane 15 greatly improves the ease of equipment maintenance, avoiding the problem of difficult disassembly and assembly caused by the space limitation of the filter membrane 15 being located inside the sedimentation tank 12. At the same time, it also ensures long-term stable operation of the equipment and extends its service life.

[0043] It is worth noting that: the low-speed propeller 6 is a QDT type low-speed propeller; the blower 9 is a T35-11 type axial flow blower; the membrane inlet pump 11 is a QBY type pneumatic diaphragm pump; the biological packing 7 is made of modified plastic and is arranged in a honeycomb pattern inside the anaerobic ammonia oxidation zone 2. The aeration device 8 can be an aeration pipe or an aeration disc.

[0044] Finally, it should be noted that the above are merely preferred embodiments of this utility model and are not intended to limit the utility model. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A high-efficiency biochemical denitrification ZMHEBT device for landfill leachate treatment, comprising a circulating tank (1), characterized in that: A water tank (25) is connected to one side of the circulating pool (1). A first reaction mechanism (23) is connected inside the circulating pool (1). A second reaction mechanism (24) is connected inside the water tank (25). A low-speed flow promoter (6) is installed inside the circulating pool (1). A water inlet pipe (10) is connected to the surface of the circulating pool (1). The first reaction mechanism (23) is composed of an anaerobic ammonia oxidation zone (2), a denitrification zone (3) and a short-cut nitrification zone (4). The second reaction mechanism (24) is composed of a nitrification zone (5). The anaerobic ammonia oxidation zone (2) is covered with biological packing material (7). The inner walls of the short-cut nitrification zone (4) and the nitrification zone (5) are equipped with aeration devices (8). A blower (9) connected to the aeration device (8) is installed on one side of the circulating tank (1). A sedimentation tank (12) is provided on one side of the second reaction mechanism (24). A membrane feed pump (11) is provided between the sedimentation tank (12) and the second reaction mechanism (24). The sedimentation tank (12), the membrane feed pump (11) and the second reaction mechanism (24) are connected by a pipeline. A return pipe (14) is connected between the sedimentation tank (12) and the circulating tank (1). A drain pipe (13) is connected to the side wall of the sedimentation tank (12). The sedimentation tank (12) is equipped with a filter membrane (15) inside. The bottom end of the filter membrane (15) is connected to a support plate (16). The sedimentation tank (12) is equipped with two threaded rods (17) that are rotatably mounted on the inside. The top end of the sedimentation tank (12) is connected to a fixing plate (26) for connecting the threaded rods (17). The sedimentation tank (12) is equipped with a fixing block (18). The surface of the fixing block (18) is connected to a rotating shaft (19). The side wall of the sedimentation tank (12) is equipped with a servo motor (20). The surface of the rotating shaft (19) is fixedly connected to a worm gear (21). The surface of the threaded rod (17) is fixedly connected to a worm wheel (22).

2. The high-efficiency biochemical denitrification ZMHEBT device for landfill leachate treatment according to claim 1, characterized in that: The threaded rod (17) is threaded through the surface of the support plate (16).

3. The high-efficiency biochemical denitrification ZMHEBT device for landfill leachate treatment according to claim 1, characterized in that: The output shaft of the servo motor (20) is connected to the rotating shaft (19).

4. The high-efficiency biochemical denitrification ZMHEBT device for landfill leachate treatment according to claim 1, characterized in that: The worm (21) is meshed with the worm wheel (22).

5. The high-efficiency biochemical denitrification ZMHEBT device for landfill leachate treatment according to claim 1, characterized in that: The two threaded rods (17) have the same thread direction, and the two threaded rods (17) rotate in the same direction through the worm (21) and the worm wheel (22).

6. The high-efficiency biochemical denitrification ZMHEBT device for landfill leachate treatment according to claim 1, characterized in that: The threaded rod (17) can be geared with the worm (21) through the worm wheel (22).

7. The high-efficiency biochemical denitrification ZMHEBT device for landfill leachate treatment according to claim 1, characterized in that: The support plate (16) can be connected to the sedimentation tank (12) in a lifting manner through the threaded rod (17), worm (21), worm wheel (22) and rotating shaft (19).

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