Biological denitrification device for landfill leachate

Abstract

The invention discloses a biological denitrification device for landfill leachate, and relates to the technical field of anaerobic digestion. The landfill leachate biological denitrification device comprises a denitrification tank, the denitrification tank comprises a tank body, the bottom of the tank body is communicated with an anaerobic tank, the bottom of the inner wall of the tank body is rotatably connected with a stirring mechanism, the right side of the tank body is communicated with a gas reuse mechanism, and the front surface of the gas reuse mechanism is fixedly connected with an electric control box. The top of the tank body is communicated with a filtering and removing mechanism, the filtering and removing mechanism comprises an upper pushing and removing plate, a lower pushing and removing plate, a coarse filter screen plate and a fine filter screen plate, and the left side of the tank body is fixedly connected with an impurity collecting box. According to the biological denitrification device for the landfill leachate, the filtering and removing mechanism, the stirring mechanism and the gas reuse mechanism are arranged, so that the influence of impurities on the activity of denitrification microorganisms and anaerobic microorganisms is prevented, the purity of separated products is improved, and the denitrification and anaerobic digestion effects of the device are improved.

Description

Technical Field

[0001] The present invention relates to the technical field of anaerobic digestion, and particularly to a biological nitrogen removal device for landfill leachate. Background Art

[0002] Biological nitrogen removal refers to the process of converting nitrogen-containing compounds in wastewater into nitrogen gas and removing it from the water under the action of microorganisms. In the process of biological nitrogen removal, the anaerobic digestion process is an important technology for cooperating with anaerobic microorganisms to convert nitrogen-containing organic matter in sludge into substances such as nitrogen gas. Biological nitrogen removal usually requires adding activated sludge or bacterial agents containing nitrogen-removing microorganisms into the treatment mechanism of the nitrogen removal device, and adding corresponding anaerobic microorganisms into the treatment mechanism implementing the anaerobic digestion process, so that the corresponding microorganisms can contact the wastewater during the processes of biological nitrogen removal and anaerobic digestion.

[0003] The patent application with the publication number of CN221191853U discloses a biological nitrogen removal device for landfill leachate, including a tank body. A sludge pipe is fixedly connected to the lower part of the tank body. An anaerobic digestion tank is fixedly connected to the sludge pipe. A valve is rotatably connected between the tank body and the anaerobic digestion tank, and the valve is on the sludge pipe. A sealing cavity is installed outside the anaerobic digestion tank, and the anaerobic digestion tank is installed in the sealing cavity. A sealing groove is formed between the anaerobic digestion tank and the sealing cavity. A water inlet pipe is fixedly installed on the sealing cavity. An air outlet pipe is fixedly installed on the anaerobic digestion tank. A ball valve is installed on the air outlet pipe. A thermometer is fixedly installed on the anaerobic digestion tank.

[0004] During the operation of the device provided by this patent, impurities in the landfill leachate will accumulate in the anaerobic digestion tank, inhibiting the activity of anaerobic microorganisms, reducing the efficiency of anaerobic digestion, and further reducing the treatment efficiency of the landfill leachate. Summary of the Invention

[0005] Aiming at the deficiencies of the prior art, the present invention provides a biological nitrogen removal device for landfill leachate to solve the problems raised in the above background art.

[0006] To achieve the above purposes, the present invention is realized through the following technical solutions: A biological nitrogen removal device for landfill leachate, including a denitrification tank. The denitrification tank includes a tank body. Two rectangular through holes are communicated with the left side of the tank body. An anaerobic tank is communicated with the bottom of the tank body. A stirring mechanism is rotatably connected to the bottom of the inner wall of the tank body. A gas reuse mechanism is communicated with the right side of the tank body. An electric control box is fixedly connected to the front of the gas reuse mechanism. A filtering and cleaning mechanism is communicated with the top of the tank body. An impurity collection box is fixedly connected to the left side of the tank body; The filtering and cleaning mechanism includes: Upper pushing cleaning plate, the upper pushing cleaning plate is slidably connected to the rectangular through-hole on the left side of the tank body, a rectangular through-hole is communicated with the top of the upper pushing cleaning plate, a metal plate is welded to the top of the upper pushing cleaning plate, and the upper pushing cleaning plate is used to remove the intercepted larger impurities; Lower pushing cleaning plate, the lower pushing cleaning plate is slidably connected to the rectangular through-hole on the left side of the tank body, a rectangular through-hole is communicated with the top of the lower pushing cleaning plate, the lower pushing cleaning plate is located at the bottom of the upper pushing cleaning plate, and the lower pushing cleaning plate is used to remove the intercepted smaller impurities; Coarse filter plate, the coarse filter plate is fixedly connected to the bottom of the inner wall of the rectangular through-hole near the top on the left side of the tank body, the coarse filter plate communicates with the two rectangular through-holes of the tank body, and the coarse filter plate is used to intercept impurities with a larger volume; Fine filter plate, the fine filter plate is fixedly connected to the bottom of the inner wall of the rectangular through-hole near the bottom on the left side of the tank body, and the fine filter plate is used to intercept impurities with a smaller volume.

[0007] Preferably, the tank body includes a main body, the inside of the main body is a hollow structure, a rectangular blind hole is opened at the top of the main body, the rectangular blind hole is communicated with the inside of the main body, the rectangular blind hole is communicated with the rectangular through-hole on the left side of the main body, an elastic metal plate is fixedly connected to the bottom of the rectangular blind hole of the main body, the rectangular through-hole on the left side of the tank body is located on the left side of the main body, a flow-through rod is communicated with the bottom of the inner wall of the main body, a rectangular through-hole is communicated with the surface of the flow-through rod, an arc-shaped convex block is fixedly connected to the top of the flow-through rod, the number of the arc-shaped convex blocks is two and they are symmetrically distributed on the top of the flow-through rod, the arc-shaped convex blocks are used to cooperate with the stirring mechanism to realize vibration, a temperature sensor is fixedly connected to the front of the main body, the temperature sensor is electrically connected to the electric control box through a wire, the temperature sensor is used to detect the temperature data inside the main body, a feed upper cover is communicated with the top of the main body, and the feed upper cover is used to guide the garbage leachate into the device for denitrification and anaerobic digestion.

[0008] Preferably, the anaerobic tank includes a containing tank, the containing tank is located in front of the main body, a pressure sensor is buried inside the containing tank, the pressure sensor is electrically connected to the electric control box, an electromagnetic on-off valve is communicated with the back of the containing tank, the electromagnetic on-off valve is used to control the on-off of the connection between the containing tank and the denitrification tank, the electromagnetic on-off valve is electrically connected to the electric control box through a wire, the back of the electromagnetic on-off valve is communicated with the bottom of the main body through a metal elbow, a filter element is fixedly connected to the front of the inner wall of the containing tank, which is used to filter the liquid of the garbage leachate and intercept the sludge for anaerobic digestion, the front of the containing tank is communicated with the liquid collection mechanism, and the electromagnetic on-off valve and the metal pipe are detachably installed.

[0009] Preferably, the stirring mechanism includes a driving motor, which is a DC motor. The driving motor is electrically connected to the electric control box through a wire. The driving motor is located at the bottom of the main body. A stirring rod is slidably connected to the top of the driving motor through a motor shaft. The stirring rod is used to stir the leachate inside the main body to promote the denitrification process.

[0010] Preferably, the stirring rod includes a sliding base, the inside of the sliding base is slidably connected to the motor shaft of the driving motor, the top of the sliding base is fixedly connected with blade support rods. The number of the blade support rods is four and they are symmetrically distributed about the center axis of the sliding base. The blade support rods are located inside the flow-through rod. The top of the blade support rod is fixedly connected with a top seat. A circular through hole is communicated with the top of the top seat. The top of the top seat is communicated with the elastic metal plate at the bottom of the square blind hole of the tank body through the circular through hole. Metal cross plates are fixedly connected to both the left and right sides of the top seat. A sliding wheel is rotatably connected to the bottom of the top seat. The surface of the sliding wheel is slidably connected to the top of the flow-through rod. Turbulence generating vanes are fixedly connected to the bottom of the metal cross plate of the top seat for assisting in stirring the leachate. The bottom of the turbulence generating vanes is fixedly connected through the metal cross plate, and the metal cross plate is rotatably connected to the outer surface of the flow-through rod.

[0011] Preferably, the gas reuse mechanism includes an air suction pump. The right side of the main body is communicated with the air suction pump. The air suction pump is electrically connected to the electric control box through a wire. The air suction pump is used to suck the gas generated by the denitrification of the main body. The right side of the air suction pump is communicated with the top of the gas tank through a metal pipe. A slide rod sleeve is fixedly connected to the right side of the main body. The slide rod sleeve is located at the top of the gas tank. A circular blind hole is opened on the right side of the slide rod sleeve. A rectangular through hole is opened on the top of the slide rod sleeve. A metal pipe is communicated with the top of the slide rod sleeve. The metal pipe is communicated with the external gas collection mechanism. The metal pipe is located on the right side of the rectangular through hole of the slide rod sleeve. The right side of the slide rod sleeve is communicated with the right side of the gas tank through a metal pipe. A pneumatic push rod is slidably connected inside the slide rod sleeve. The left side of the pneumatic push rod and the left side of the blind hole of the slide rod sleeve are fixedly connected through a spring.

[0012] Preferably, the gas tank includes a high-pressure box body. The top of the high-pressure box body is communicated with the right side of the air suction pump through a metal pipe. The electric control box is fixedly connected to the front of the high-pressure box body. A pressure sensor is inserted into the top of the high-pressure box body for sensing the gas pressure data inside the high-pressure box body. The pressure sensor is electrically connected to the electric control box through a wire. An electromagnetic valve is communicated with the right side of the pressure sensor. The electromagnetic valve is used to control the on-off situation between the inside of the high-pressure box body and the slide rod sleeve. The electromagnetic valve is electrically connected to the electric control box through a wire. The right side of the electromagnetic valve is communicated with the right side blind hole of the slide rod sleeve through a metal pipe.

[0013] Preferably, the pneumatic push rod includes a hollow rod body. A circular blind hole is connected to the right side of the hollow rod body for assisting high-pressure gas to push the hollow rod body to slide. A circular through hole is connected to the top of the hollow rod body. The circular through hole at the top of the hollow rod body is connected to the circular blind hole for discharging excess gas when the hollow rod body reaches the limit position. A push frame is fixedly connected to the top of the hollow rod body. The front surface of the push frame is slidably connected to the rectangular blind hole at the top of the slide rod sleeve. The push frame is used to push the filter cleaning mechanism to clean the impurities in the device.

[0014] Preferably, the push frame is located on the right side of the upper push cleaning plate. The upper push cleaning plate is located on the top of the coarse filter plate. The coarse filter plate is located on the top of the fine filter plate. The coarse filter plate is located at the bottom of the feeding upper cover. The coarse filter plate is located on the top of the lower push cleaning plate. The lower push cleaning plate is located on the top of the fine filter plate. The fine filter plate is located on the top of the elastic metal plate of the main body square blind hole. The left and right sides of the upper push cleaning plate are fixedly connected to the left and right sides of the lower push cleaning plate through metal plates. The impurity collection box is located at the bottom of the lower push cleaning plate.

[0015] Preferably, the upper push cleaning plate and the lower push cleaning plate are used to push the solid impurities staying inside the rectangular through holes of the upper push cleaning plate and the lower push cleaning plate under the cooperation of the pushing of the push frame, the interception of the coarse filter plate and the fine filter plate, discharge the intercepted impurities from the device, and prevent the device from being blocked by excessive impurities.

[0016] The present invention provides a biological denitrification device for landfill leachate, which has the following beneficial effects: 1. For the biological denitrification device for landfill leachate, by setting up a filter cleaning mechanism and using the filter cleaning mechanism in cooperation with the denitrification tank, the impurities before the biological denitrification of the landfill leachate are filtered, preventing the impurities from affecting the activities of denitrifying microorganisms and anaerobic microorganisms, improving the purity of the separation products, and at the same time improving the working efficiency of the device.

[0017] 2. For the biological denitrification device for landfill leachate, by setting up a stirring mechanism, the uniform mixing of the landfill leachate and denitrifying microorganisms in the denitrification tank is realized, promoting the denitrification process of the denitrifying microorganisms on the landfill leachate, and in cooperation with the denitrification tank and the filter cleaning mechanism, using vibration to promote the uniform mixing of the landfill leachate and denitrifying microorganisms, and using vibration to loosen the impurities in the filter cleaning mechanism to prevent the impurities from blocking the device, and improving the denitrification and anaerobic digestion effects of the device.

[0018] 3. For the biological denitrification device for landfill leachate, by setting up a gas reuse mechanism, the gas generated by denitrification is collected and pressurized, and using the gas reuse mechanism in cooperation with the filter cleaning mechanism, the filter cleaning mechanism is enabled to periodically remove the impurities intercepted in the device, thereby realizing the self-cleaning of the device, improving the automation degree of the device, preventing the impurities from blocking the device, and promoting the denitrification and anaerobic digestion processes of the device.

[0019] 4. The biological nitrogen removal device for landfill leachate realizes the automatic creation of an anoxic environment in the anaerobic tank and the real-time monitoring of the reaction process by setting an anaerobic tank and cooperating with an electromagnetic on-off valve and a pressure sensor inside the anaerobic tank, improves the reaction effect of anaerobic digestion, enhances the functionality of the anaerobic tank by draining water from the anaerobic tank, simplifies the device structure, and further improves the working efficiency of the device. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of the overall front structure of the present invention; Figure 2 It is a schematic diagram of the overall left structure of the present invention; Figure 3 It is a cross-sectional view of the internal structure of the anaerobic tank of the present invention; Figure 4 It is a schematic diagram of the overall structure of the stirring mechanism of the present invention; Figure 5 It is a cross-sectional view of the positional relationship of the internal mechanisms of the tank body of the present invention; Figure 6 It is for the present invention Figure 5 The enlarged schematic diagram of the structure at A in; Figure 7 It is a cross-sectional view of the positional relationship between the blade support rod and the flow-through rod of the present invention; Figure 8 It is a cross-sectional view of the positional relationship between the pneumatic push rod and the cleaning plate of the present invention; Figure 9 It is a schematic diagram of the overall structure of the pneumatic push rod of the present invention; Figure 10 It is a cross-sectional view of the positional relationship between the stirring mechanism and the filtering and cleaning mechanism of the present invention; Figure 11 It is a schematic diagram of the positional relationship between the upper cleaning plate and the lower cleaning plate of the present invention; Figure 12 It is a cross-sectional view of the positional relationship between the cleaning plate and the mesh plate of the present invention.

[0021] In the figure: 1. Denitrification tank; 11. Tank body; 111. Main body; 112. Flow-through rod; 113. Arc-shaped convex block; 12. Temperature sensor; 13. Feed upper cover; 2. Anaerobic tank; 21. Accommodating tank; 22. Electromagnetic on-off valve; 23. Filter element; 3. Stirring mechanism; 31. Driving motor; 32. Stirring rod; 321. Sliding base; 322. Blade support rod; 323. Top seat; 324. Sliding wheel; 325. Turbulence blade; 4. Gas reuse mechanism; 41. Suction pump; 42. Gas box; 421. High-pressure box body; 422. Electromagnetic valve; 423. Air pressure sensor; 43. Slide rod sleeve; 44. Pneumatic push rod; 441. Hollow rod body; 442. Pushing frame; 5. Electric control box; 6. Filtering and cleaning mechanism; 61. Upper pushing cleaning plate; 62. Lower pushing cleaning plate; 63. Coarse filter screen plate; 64. Fine filter screen plate; 7. Impurity collection box. Detailed implementation manners

[0022] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments.

[0023] Examples of the embodiments are shown in the accompanying drawings, where the same or similar reference numerals represent the same or similar elements or elements with the same or similar functions from beginning to end. The embodiments described below by referring to the accompanying drawings are exemplary and are intended to explain the present invention, and should not be construed as a limitation to the present invention.

[0024] Embodiment 1: Please refer to Figures 1-3 , the present invention provides a technical solution: a biological denitrification device for landfill leachate, including a denitrification tank 1. The denitrification tank 1 includes a tank body 11. Two rectangular through holes are communicated on the left side of the tank body 11. The tank body 11 includes a main body 111. The inside of the main body 111 is a hollow structure. A pressure sensor is buried inside the main body 111. A rectangular blind hole is opened at the top of the main body 111. The rectangular blind hole is communicated with the inside of the main body 111. The rectangular blind hole is communicated with the rectangular through hole on the left side of the main body 111. An elastic metal plate is fixedly connected to the bottom of the rectangular blind hole of the main body 111. The rectangular through hole on the left side of the tank body 11 is located on the left side of the main body 111. The bottom of the inner wall of the main body 111 is communicated with a flow-through rod 112. The surface of the flow-through rod 112 is communicated with a rectangular through hole. An arc-shaped convex block 113 is fixedly connected to the top of the flow-through rod 112. The number of the arc-shaped convex blocks 113 is two and they are symmetrically distributed on the top of the flow-through rod 112. The arc-shaped convex blocks 113 are used to cooperate with the stirring mechanism 3 to achieve vibration. A temperature sensor 12 is fixedly connected to the front of the main body 111. The temperature sensor 12 is electrically connected to the electric control box 5 through a wire. The temperature sensor 12 is used to detect the temperature data inside the main body 111. The top of the main body 111 is communicated with a feed upper cover 13. The feed upper cover 13 is used to guide the landfill leachate into the device for denitrification and anaerobic digestion; At the bottom of the tank body 11, there is an anaerobic tank 2 connected. The anaerobic tank 2 includes a containing tank 21, and the containing tank 21 is located in front of the main body 111. A pressure sensor is buried inside the containing tank 21, and the pressure sensor is electrically connected to the electric control box 5. At the back of the containing tank 21, there is an electromagnetic on-off valve 22 connected. The electromagnetic on-off valve 22 is used to control the on-off of the connection between the containing tank 21 and the denitrification tank 1. The electromagnetic on-off valve 22 is electrically connected to the electric control box 5 through a wire. At the back of the electromagnetic on-off valve 22, it is connected to the bottom of the main body 111 through a metal elbow. On the front of the inner wall of the containing tank 21, there is a filter element 23 fixedly connected, which is used to filter the liquid of the garbage leachate and intercept the sludge for anaerobic digestion. The front of the containing tank 21 is connected to the liquid collection mechanism, and the electromagnetic on-off valve 22 and the metal pipe are detachably installed; At the bottom of the inner wall of the tank body 11, there is a stirring mechanism 3 rotatably connected. On the right side of the tank body 11, there is a gas reuse mechanism 4 connected. On the front of the gas reuse mechanism 4, there is an electric control box 5 fixedly connected. At the top of the tank body 11, there is a filtering and removing mechanism 6 connected. On the left side of the tank body 11, there is an impurity collection box 7 fixedly connected.

[0025] During use, before introducing the garbage leachate, disconnect the connection between the electromagnetic on-off valve 22 and the metal pipe, so as to remove the anaerobic tank 2. Add the solution containing anaerobic microorganisms into the containing tank 21, and then reset the anaerobic tank 2. Connect the front of the containing tank 21 to the liquid collection mechanism. After the anaerobic tank 2 is reset, add the solution containing denitrifying microorganisms into the main body 111 through the feeding upper cover 13. After the injection of the solution containing denitrifying microorganisms is completed, start the whole device through the electric control box 5. After the electric control box 5 is started, the stirring mechanism 3 and the gas reuse mechanism 4 are started. Then, inject the garbage leachate into the device through the feeding upper cover 13. After the garbage leachate intercepts impurities through the filtering and removing mechanism 6, the remaining leachate enters the main body 111 through the flow-through rod 112 and is evenly mixed with the denitrifying microorganisms under the stirring of the stirring mechanism 3 for the biological denitrification process. During this period, the temperature sensor 12 transmits the temperature data inside the main body 111 back to the electric control box 5. After the gas reuse mechanism 4 is started, it inhales and collects the gas generated during the biological denitrification process. When the temperature data feedback by the temperature sensor 12 reaches the temperature corresponding to the completion of denitrification, the electric control box 5 controls the stirring mechanism 3 to stop working, and at the same time controls the electromagnetic on-off valve 22 to start. After the electromagnetic on-off valve 22 is started, it connects the containing tank 21 and the main body 111, and the mixed liquid after denitrification is completed enters the containing tank 21. Among them, the liquid in the leachate is filtered by the filter element 23 and enters the liquid collection mechanism, and the sludge in the leachate is intercepted by the filter element 23 inside the containing tank 21 and is mixed with the anaerobic microorganisms under the push of the liquid flow; After all the liquid is drained, the electromagnetic on-off valve 22 is controlled by the electric control box 5 to close, and at the same time, the connection between the accommodation tank 21 and the liquid collection mechanism is cut off and sealed, so as to create an anoxic environment inside the accommodation tank 21 and carry out the anaerobic digestion process. During this period, the pressure sensor inside the accommodation tank 21 transmits the pressure data inside the accommodation tank 21 in real time. When the pressure data inside the accommodation tank 21 reaches the pressure range corresponding to the completion of the anaerobic digestion process, the electric control box 5 controls the electromagnetic on-off valve 22 to open, and reconnects the accommodation tank 21 and the main body 111. Since the accommodation tank 21 is in a closed state before the electromagnetic on-off valve 22 is opened, and the gas generated after anaerobic digestion increases the gas pressure inside the accommodation tank 21, the gas generated during the anaerobic digestion process enters the main body 111 under the action of the higher air pressure inside the accommodation tank 21. At this time, the pressure value feedback by the pressure sensor buried inside the main body 111 rises. At this time, the gas reuse mechanism 4 is started, and the gas entering the main body 111 is inhaled by the gas reuse mechanism 4. When the feedback value of the pressure sensor of the main body 111 and the pressure value inside the accommodation tank 21 return to the values before the denitrification process and the pressure values feedback by the two sensors are the same, it is judged that the gas generated during the denitrification and anaerobic digestion processes has been completely absorbed, and the negative pressure balance is achieved inside the main body 111 and the accommodation tank 21. Then, the gas reuse mechanism 4 is closed to complete the collection of the reaction gas. Then, the anaerobic tank 2 is removed, and the sludge after anaerobic digestion is taken out.

[0026] Embodiment 2: Please refer to Figures 1-7 , based on Embodiment 1, the present invention provides a technical solution: The stirring mechanism 3 includes a driving motor 31. The driving motor 31 is a DC motor. The driving motor 31 is electrically connected to the electric control box 5 through a wire. The driving motor 31 is located at the bottom of the main body 111. The top of the driving motor 31 is slidably connected to a stirring rod 32 through a motor shaft. The stirring rod 32 is used to stir the leachate inside the main body 111 to promote the denitrification process; The stirring rod 32 includes a sliding base 321. The inside of the sliding base 321 is slidably connected to the motor shaft of the driving motor 31. The top of the sliding base 321 is fixedly connected to a blade support rod 322. The number of the blade support rods 322 is four and they are symmetrically distributed about the center of the sliding base 321. The blade support rods 322 are located inside the flow-through rod 112. The top of the blade support rod 322 is fixedly connected to a top seat 323. A circular through hole is communicated with the top of the top seat 323. The top of the top seat 323 is communicated with the elastic metal plate at the bottom of the square blind hole of the tank body 11 through the circular through hole. Metal cross plates are fixedly connected to both the left and right sides of the top seat 323. A sliding wheel 324 is rotatably connected to the bottom of the top seat 323. The surface of the sliding wheel 324 is slidably connected to the top of the flow-through rod 112. A spoiler blade 325 is fixedly connected to the bottom of the metal cross plate of the top seat 323 for assisting in stirring the leachate. The bottom of the spoiler blade 325 is fixedly connected through the metal cross plate, and the metal cross plate is rotatably connected to the outer surface of the flow-through rod 112.

[0027] During use, after the device is started, the driving motor 31 drives the stirring rod 32 to rotate. The leachate enters the flow-through rod 112 through the through-hole at the top of the top seat 323. The blade support rod 322 stirs the leachate entering the inside of the flow-through rod 112, and the turbulence blade 325 stirs the leachate entering the inside of the main body 111. During the rotation of the stirring rod 32, the sliding wheel 324 rolls along the top surface of the flow-through rod 112, and drives the entire stirring rod 32 to slide upward when rolling onto the surface of the arc-shaped bump 113. A relative sliding occurs between the stirring rod 32 and the motor shaft of the driving motor 31, thereby realizing the periodic vibration of the blade support rod 322 and the turbulence blade 325, promoting the mixing of the leachate and the denitrifying microorganisms. At the same time, the top of the top seat 323 periodically squeezes the elastic metal plate at the bottom of the square blind hole of the main body 111, causing the elastic metal plate to vibrate periodically. The vibration is transmitted to the filtering and cleaning mechanism 6, promoting the loosening of the impurities intercepted by the filtering and cleaning mechanism 6, and preventing the impurities from staying for a long time and blocking the device.

[0028] Embodiment 3: Please refer to Figures 1-12 , based on Embodiment 1 and Embodiment 2, the present invention provides a technical solution: The gas reuse mechanism 4 includes an air suction pump 41. The right side of the main body 111 is connected to the air suction pump 41. The air suction pump 41 is electrically connected to the electric control box 5 through a wire. The air suction pump 41 is used to inhale the gas generated by denitrification of the main body 111. The right side of the air suction pump 41 is connected to the top of the gas tank 42 through a metal pipe. The gas tank 42 includes a high-pressure box body 421. The top of the high-pressure box body 421 is connected to the right side of the air suction pump 41 through a metal pipe. The front of the high-pressure box body 421 is fixedly connected to the electric control box 5. A pressure sensor 423 is inserted into the top of the high-pressure box body 421 for sensing the gas pressure data inside the high-pressure box body 421. The pressure sensor 423 is electrically connected to the electric control box 5 through a wire. The right side of the pressure sensor 423 is connected to an electromagnetic valve 422. The electromagnetic valve 422 is used to control the on-off situation between the inside of the high-pressure box body 421 and the slide rod sleeve 43. The electromagnetic valve 422 is electrically connected to the electric control box 5 through a wire. The right side of the electromagnetic valve 422 is connected to the right blind hole of the slide rod sleeve 43 through a metal pipe. The right side of the main body 111 is fixedly connected to a slide rod sleeve 43. The slide rod sleeve 43 is located at the top of the gas tank 42. A circular blind hole is opened on the right side of the slide rod sleeve 43, a rectangular through-hole is opened on the top of the slide rod sleeve 43, and a metal pipe is connected to the top of the slide rod sleeve 43. The metal pipe is connected to the external gas collection mechanism. The metal pipe is located on the right side of the rectangular through-hole of the slide rod sleeve 43. The right side of the slide rod sleeve 43 is connected to the right side of the gas tank 42 through a metal pipe. A pneumatic push rod 44 is slidably connected inside the slide rod sleeve 43. The left side of the pneumatic push rod 44 is fixedly connected to the left side of the blind hole of the slide rod sleeve 43 through a spring. The pneumatic push rod 44 includes a hollow rod body 441. A circular blind hole communicates with the right side of the hollow rod body 441, which is used to assist high-pressure gas to push the hollow rod body 441 to slide. A circular through hole communicates with the top of the hollow rod body 441. The circular through hole at the top of the hollow rod body 441 communicates with the circular blind hole, which is used to discharge excess gas when the hollow rod body 441 reaches the limit position. A push frame 442 is fixedly connected to the top of the hollow rod body 441. The front surface of the push frame 442 is slidably connected to the rectangular blind hole at the top of the slide rod sleeve 43. The push frame 442 is located on the right side of the filtration and cleaning mechanism 6. The push frame 442 is used to push the filtration and cleaning mechanism 6 to clean the impurities in the device; The filtration and cleaning mechanism 6 includes: An upper push cleaning plate 61, which is slidably connected to the rectangular through hole on the left side of the tank body 11. A rectangular through hole communicates with the top of the upper push cleaning plate 61. A metal plate is welded to the top of the upper push cleaning plate 61. The metal plate is fixedly connected to the top of the feed upper cover 13 through a spring. The upper push cleaning plate 61 is located on the top of the coarse filter screen plate 63. The coarse filter screen plate 63 is located on the top of the fine filter screen plate 64. The left and right sides of the upper push cleaning plate 61 are fixedly connected to the left and right sides of the lower push cleaning plate 62 through metal plates. The upper push cleaning plate 61 is used to remove the larger intercepted impurities; A lower push cleaning plate 62, which is slidably connected to the rectangular through hole on the left side of the tank body 11. A rectangular through hole communicates with the top of the lower push cleaning plate 62. The lower push cleaning plate 62 is located on the top of the fine filter screen plate 64. The lower push cleaning plate 62 is located at the bottom of the upper push cleaning plate 61. The lower push cleaning plate 62 is used to remove the smaller intercepted impurities. The impurity collection box 7 is located at the bottom of the lower push cleaning plate 62; A coarse filter screen plate 63, which is fixedly connected to the bottom of the inner wall of the rectangular through hole near the top on the left side of the tank body 11. The coarse filter screen plate 63 is located at the bottom of the feed upper cover 13. The coarse filter screen plate 63 is located on the top of the lower push cleaning plate 62. The coarse filter screen plate 63 communicates with the two rectangular through holes of the tank body 11. The coarse filter screen plate 63 is used to intercept impurities with larger volumes; A fine filter screen plate 64, which is fixedly connected to the bottom of the inner wall of the rectangular through hole near the bottom on the left side of the tank body 11. The fine filter screen plate 64 is located on the top of the elastic metal plate of the square blind hole of the main body 111. The fine filter screen plate 64 is used to intercept impurities with smaller volumes.

[0029] During use, the landfill leachate entering the feed upper cover 13 is first filtered by the coarse filter screen plate 63 and the fine filter screen plate 64 in sequence, and then enters the main body 111. During this process, solid impurities of different sizes in the landfill leachate will be intercepted by the coarse filter screen plate 63 and the fine filter screen plate 64 step by step, thereby preventing solid impurities from entering the subsequent treatment mechanism and affecting the treatment of landfill leachate; Before the device starts, connect the metal pipe of the slide rod sleeve 43 to the gas collection mechanism. After the gas reuse mechanism 4 starts, the gas generated during the denitrification and anaerobic digestion processes is absorbed by the suction pump 41. The gas enters the high-pressure box body 421 through the metal pipe and is stored and collected by the high-pressure box body 421. During this period, the air pressure sensor 423 monitors the gas pressure data inside the high-pressure box body 421 in real time and transmits it back to the electric control box 5. When the gas pressure increment inside the high-pressure box body 421 fed back by the air pressure sensor 423 reaches the air pressure amount of the gas generated by the leachate injected into the main body 111 once, the electric control box 5 controls the stirring mechanism 3 to stop stirring and execute the subsequent anaerobic digestion process of Embodiment 1. When the gas pressure value inside the high-pressure box body 421 fed back by the air pressure sensor 423 reaches the pressure limit of the high-pressure box body 421, the electric control box 5 starts by controlling the solenoid valve 422, connects the high-pressure box body 421 and the slide rod sleeve 43, and discharges the excess gas to the slide rod sleeve 43 through the metal pipe. After the high-pressure gas enters the slide rod sleeve 43, it first enters the blind hole of the hollow rod body 441. As the high-pressure gas increases, the hollow rod body 441 is pushed by the high-pressure gas to slide to the left. The hollow rod body 441 drives the push frame 442 to slide to the left. At the same time, the push frame 442 pushes the upper push cleaning plate 61 and the lower push cleaning plate 62 to slide to the left. The excess gas is discharged along the metal pipe of the slide rod sleeve 43 to the gas collection mechanism for subsequent treatment. The impurities intercepted inside the filtration and cleaning mechanism 6 move to the left under the push of the upper push cleaning plate 61 and the lower push cleaning plate 62. The rectangular through holes inside the upper push cleaning plate 61 and the lower push cleaning plate 62 push the solid impurities intercepted by the coarse filter plate 63 and the fine filter plate 64 inside them to move to the right together. When the rectangular through holes inside the upper push cleaning plate 61 and the lower push cleaning plate 62 slide out of the tank body 11, the solid impurities sliding out of the tank body 11 part fall off under the action of gravity, and the solid impurities fall into the impurity collection box 7 to complete the collection of impurities; When the gas pressure value inside the high-pressure box body 421 returns to the normal range, the solenoid valve 422 closes, there is no high-pressure gas discharge, and the pneumatic push rod 44, the upper push cleaning plate 61, and the lower push cleaning plate 62 reset under the action of the spring.

[0030] The above is only a preferred specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention, according to the technical solution of the present invention and its inventive concept, makes equivalent substitutions or changes, and should be covered by the protection scope of the present invention.

Claims

1. A biological denitrification device for landfill leachate, comprising a denitrification tank (1), characterized in that: The denitrification tank (1) includes a tank body (11). Two rectangular through-holes are connected to the left side of the tank body (11). An anaerobic tank (2) is connected to the bottom of the tank body (11). A stirring mechanism (3) is rotatably connected to the bottom of the inner wall of the tank body (11). A gas reuse mechanism (4) is connected to the right side of the tank body (11). An electric control box (5) is fixedly connected to the front of the gas reuse mechanism (4). A filtering and removing mechanism (6) is connected to the top of the tank body (11). An impurity collection box (7) is fixedly connected to the left side of the tank body (11); The filtering and removing mechanism (6) includes: An upward pushing cleaning plate (61). The upward pushing cleaning plate (61) is slidably connected to the rectangular through-hole on the left side of the tank body (11). A rectangular through-hole is connected to the top of the upward pushing cleaning plate (61). A metal plate is welded to the top of the upward pushing cleaning plate (61). The upward pushing cleaning plate (61) is used to remove the intercepted larger impurities; A downward pushing cleaning plate (62). The downward pushing cleaning plate (62) is slidably connected to the rectangular through-hole on the left side of the tank body (11). A rectangular through-hole is connected to the top of the downward pushing cleaning plate (62). The downward pushing cleaning plate (62) is located at the bottom of the upward pushing cleaning plate (61). The downward pushing cleaning plate (62) is used to remove the intercepted smaller impurities; A coarse filter screen plate (63). The coarse filter screen plate (63) is fixedly connected to the bottom of the inner wall of the rectangular through-hole near the top on the left side of the tank body (11). The coarse filter screen plate (63) connects the two rectangular through-holes of the tank body (11). The coarse filter screen plate (63) is used to intercept impurities with a larger volume; A fine filter screen plate (64). The fine filter screen plate (64) is fixedly connected to the bottom of the inner wall of the rectangular through-hole near the bottom on the left side of the tank body (11). The fine filter screen plate (64) is used to intercept impurities with a smaller volume.

2. The biological denitrification device for landfill leachate according to claim 1, characterized in that: The tank body (11) includes a main body (111). The inside of the main body (111) is a hollow structure. A rectangular blind hole is opened at the top of the main body (111). The rectangular blind hole is communicated with the inside of the main body (111). The rectangular blind hole is communicated with the rectangular through-hole on the left side of the main body (111). An elastic metal plate is fixedly connected to the bottom of the rectangular blind hole of the main body (111). The rectangular through-hole on the left side of the tank body (11) is located on the left side of the main body (111). A through-flow rod (112) is communicated with the bottom of the inner wall of the main body (111). A rectangular through-hole is communicated with the surface of the through-flow rod (112). An arc-shaped convex block (113) is fixedly connected to the top of the through-flow rod (112). The number of the arc-shaped convex blocks (113) is two and they are symmetrically distributed on the top of the through-flow rod (112). The arc-shaped convex blocks (113) are used to cooperate with the stirring mechanism (3) to realize vibration. A temperature sensor (12) is fixedly connected to the front of the main body (111). The temperature sensor (12) is electrically connected to the electric control box (5) through a wire. The temperature sensor (12) is used to detect the internal temperature data of the main body (111). A feed upper cover (13) is communicated with the top of the main body (111). The feed upper cover (13) is used to guide the leachate into the device for denitrification and anaerobic digestion.

3. The biological denitrification device for landfill leachate according to claim 2, characterized in that: The anaerobic tank (2) includes a containment tank (21) which is located in front of the main body (111). A pressure sensor is embedded inside the containment tank (21), and the pressure sensor is electrically connected to the electric control box (5). A solenoid on-off valve (22) is connected to the back of the containment tank (21), and the solenoid on-off valve (22) is used to control the on-off of the connection between the containment tank (21) and the denitrification tank (1). The solenoid on-off valve (22) is electrically connected to the electric control box (5) through a wire. The back of the solenoid on-off valve (22) is connected to the bottom of the main body (111) through a metal elbow pipe. A filter element (23) is fixedly connected to the front of the inner wall of the containment tank (21) for filtering the liquid of the landfill leachate and intercepting the sludge for anaerobic digestion. The front of the containment tank (21) is connected to a liquid collection mechanism, and the solenoid on-off valve (22) and the metal pipe are detachably installed.

4. The biological denitrification device for landfill leachate according to claim 3, wherein: The stirring mechanism (3) includes a driving motor (31), the driving motor (31) is a DC motor, the driving motor (31) is electrically connected to the electric control box (5) through a wire, the driving motor (31) is located at the bottom of the main body (111), and a stirring rod (32) is slidably connected to the top of the driving motor (31) through a motor shaft. The stirring rod (32) is used to stir the landfill leachate inside the main body (111) to promote the denitrification process.

5. The biological denitrification device for landfill leachate according to claim 4, characterized in that: The stirring rod (32) includes a sliding base (321), the inside of the sliding base (321) is slidably connected to the motor shaft of the driving motor (31), a blade support rod (322) is fixedly connected to the top of the sliding base (321), the number of the blade support rods (322) is four and they are symmetrically distributed about the center axis of the sliding base (321). The blade support rods (322) are located inside the flow-through rod (112). A top seat (323) is fixedly connected to the top of the blade support rod (322). A circular through-hole is communicated with the top of the top seat (323). The top of the top seat (323) is communicated with an elastic metal plate at the bottom of the square blind hole of the tank body (11) through the circular through-hole. Metal cross plates are fixedly connected to both the left and right sides of the top seat (323). A sliding wheel (324) is rotatably connected to the bottom of the top seat (323), and the surface of the sliding wheel (324) is slidably connected to the top of the flow-through rod (112). Turbulence generating vanes (325) are fixedly connected to the bottom of the metal cross plates of the top seat (323) for assisting in stirring the landfill leachate. The bottom of the turbulence generating vanes (325) is fixedly connected through a metal cross plate, and the metal cross plate is rotatably connected to the outer surface of the flow-through rod (112).

6. The biological denitrification device for landfill leachate according to claim 5, characterized in that: The gas reuse mechanism (4) includes an air suction pump (41). The right side of the main body (111) is communicated with the air suction pump (41). The air suction pump (41) is electrically connected to the electric control box (5) through a wire. The air suction pump (41) is used to suck the gas generated by the denitrification of the main body (111). The right side of the air suction pump (41) is communicated with the top of the gas box (42) through a metal pipe. A slide bar sleeve (43) is fixedly connected to the right side of the main body (111). The slide bar sleeve (43) is located at the top of the gas box (42). A circular blind hole is opened on the right side of the slide bar sleeve (43). A rectangular through hole is opened on the top of the slide bar sleeve (43). A metal pipe is communicated with the top of the slide bar sleeve (43). The metal pipe is communicated with the external gas collection mechanism. The metal pipe is located on the right side of the rectangular through hole of the slide bar sleeve (43). The right side of the slide bar sleeve (43) is communicated with the right side of the gas box (42) through a metal pipe. A pneumatic push rod (44) is slidably connected inside the slide bar sleeve (43). The left side of the pneumatic push rod (44) is fixedly connected to the left side of the blind hole of the slide bar sleeve (43) through a spring.

7. The biological denitrification device for landfill leachate according to claim 6, wherein: The gas box (42) includes a high-pressure box body (421). The top of the high-pressure box body (421) is communicated with the right side of the air suction pump (41) through a metal pipe. The electric control box (5) is fixedly connected to the front of the high-pressure box body (421). A pressure sensor (423) is inserted into the top of the high-pressure box body (421) for sensing the gas pressure data inside the high-pressure box body (421). The pressure sensor (423) is electrically connected to the electric control box (5) through a wire. An electromagnetic valve (422) is communicated with the right side of the pressure sensor (423). The electromagnetic valve (422) is used to control the on-off situation between the inside of the high-pressure box body (421) and the slide bar sleeve (43). The electromagnetic valve (422) is electrically connected to the electric control box (5) through a wire. The right side of the electromagnetic valve (422) is communicated with the right-side blind hole of the slide bar sleeve (43) through a metal pipe.

8. The biological denitrification device for landfill leachate according to claim 7, wherein: The pneumatic push rod (44) includes a hollow rod body (441). A circular blind hole is communicated with the right side of the hollow rod body (441) for assisting the high-pressure gas to push the hollow rod body (441) to slide. A circular through hole is communicated with the top of the hollow rod body (441). The circular through hole at the top of the hollow rod body (441) is communicated with the circular blind hole for discharging the redundant gas when the hollow rod body (441) reaches the limit position. A push frame (442) is fixedly connected to the top of the hollow rod body (441). The front of the push frame (442) is slidably connected to the rectangular blind hole at the top of the slide bar sleeve (43). The push frame (442) is used to push the filter cleaning mechanism (6) to clean the impurities in the device.

9. The biological denitrification device for landfill leachate according to claim 8, characterized in that: The pushing frame (442) is located on the right side of the upper pushing cleaning plate (61). The top of the upper pushing cleaning plate (61) is fixedly connected to the feeding upper cover (13) through a spring. The upper pushing cleaning plate (61) is located on top of the coarse filter screen plate (63). The coarse filter screen plate (63) is located on top of the fine filter screen plate (64). The coarse filter screen plate (63) is located at the bottom of the feeding upper cover (13). The coarse filter screen plate (63) is located on top of the lower pushing cleaning plate (62). The lower pushing cleaning plate (62) is located on top of the fine filter screen plate (64). The fine filter screen plate (64) is located on top of the elastic metal plate in the square blind hole of the main body (111). The left and right sides of the upper pushing cleaning plate (61) are fixedly connected to the left and right sides of the lower pushing cleaning plate (62) through metal plates. The impurity collection box (7) is located at the bottom of the lower pushing cleaning plate (62).

10. The biological denitrification device for landfill leachate according to claim 9, characterized in that: The upper pushing cleaning plate (61) and the lower pushing cleaning plate (62) are used to push the solid impurities remaining in the rectangular through holes of the upper pushing cleaning plate (61) and the lower pushing cleaning plate (62) under the pushing of the pushing frame (442) and the interception cooperation of the coarse filter screen plate (63) and the fine filter screen plate (64), discharge the intercepted impurities from the device, and prevent the device from being blocked by excessive impurities.

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