External reflux device of landfill leachate ultrafiltration device

Abstract

The utility model relates to the technical field of external reflux devices of landfill leachate ultrafiltration devices, in particular to an external reflux device of a landfill leachate ultrafiltration device, which comprises a device body provided with a connecting mechanism. The leachate is preliminarily purified by intercepting macromolecular organic matters, colloids, bacteria and other impurities in the landfill leachate, the preliminarily purified liquid is further treated by a re-filtering assembly, a threaded push rod is driven by a driving motor to rotate, so that a film pressing plate applies pressure to the liquid on a filter film II, and the liquid is guided to be uniformly distributed by combining a flow guide plate; and finer filtration is realized. According to the landfill leachate treated by the device, the chemical oxygen demand (COD), heavy metal ions, the content of pollutants such as ammonia nitrogen and the like are greatly reduced, more strict emission standards can be met, pollution to soil, surface water and underground water is effectively reduced, the purified water quality is remarkably improved, and the ecological environment is powerfully protected.

Description

Technical Field

[0001] This utility model relates to the technical field of external reflux devices for landfill leachate ultrafiltration devices, and in particular to an external reflux device for landfill leachate ultrafiltration devices. Background Technology

[0002] With the acceleration of global urbanization, the amount of municipal solid waste generated is increasing daily. According to relevant statistics, the global annual production of municipal solid waste has reached billions of tons in recent years and continues to grow. During landfill and other disposal processes, large amounts of leachate are generated due to rainwater runoff and decomposition. Leachate has an extremely complex composition, containing not only high concentrations of organic matter, such as various volatile fatty acids and humic acids, with chemical oxygen demand (COD) often reaching thousands or even tens of thousands of milligrams per liter; but also rich in heavy metal ions, such as mercury, cadmium, lead, and chromium, as well as high concentrations of ammonia nitrogen. If these pollutants are discharged directly into the environment without effective treatment, they will cause extremely serious pollution to soil, surface water, and groundwater.

[0003] Traditional landfill leachate treatment methods, such as biological and physicochemical treatments, have many drawbacks. Biological treatment is greatly affected by changes in leachate quality and quantity, resulting in unstable treatment efficiency. It is also ineffective at removing some recalcitrant organic matter and heavy metal ions. While physicochemical treatment can remove some pollutants to a certain extent, it is costly and generates large amounts of chemical sludge, making subsequent disposal difficult. With increasingly stringent environmental standards, traditional treatment methods are finding it increasingly difficult to meet new emission standards. Therefore, an external reflux device for landfill leachate ultrafiltration is proposed to address these problems. Utility Model Content

[0004] To address the shortcomings of existing technologies, this utility model provides an external reflux device for ultrafiltration of landfill leachate. This solves the problems of traditional landfill leachate treatment methods, such as biological treatment, which is greatly affected by changes in leachate quality and quantity, resulting in unstable treatment efficiency and poor removal of some recalcitrant organic matter and heavy metal ions. While physicochemical treatment methods can remove some pollutants to a certain extent, they are costly and generate a large amount of chemical sludge, making subsequent disposal difficult. With increasingly stringent environmental standards, traditional treatment methods are finding it increasingly difficult to meet new emission standards.

[0005] To solve the above-mentioned technical problems, the present invention provides the following technical solution: an external reflux device for landfill leachate ultrafiltration, comprising a device body, the device body being provided with a connecting mechanism, the connecting mechanism including a reflux component disposed in the upper section of the device body, an ultrafiltration component disposed in the middle section of the device body, and a refiltration component disposed in the lower section of the device body;

[0006] The re-filtration assembly includes a drive motor fixedly installed on the back of the device body. A threaded push rod is fixedly connected to the output end of the drive motor. A threaded sleeve is threadedly connected to the outer wall of the threaded push rod. A sliding sleeve is fixedly connected to the outer wall of the threaded sleeve. A limit spring is fixedly connected to the bottom of the inner wall of the sliding sleeve. A push rod is fixedly connected to the outer end of the limit spring. A pressure plate is fixedly connected to the outer end of the push rod. A filter plate is fixedly connected to the inner wall of the lower section of the device body. A receiving partition frame is fixedly connected to the inner wall of the filter plate. A second filter membrane is supported at the top of the receiving partition frame. Guide plates are fixedly connected to both sides of the inner wall of the lower section of the device body. A guide frame is fixedly installed at the bottom of the inner wall of the device body. A discharge pipe is connected to the bottom of the guide frame.

[0007] A further improvement is that the reflux assembly includes a mounting plate fixedly installed on the top of the device body, a connecting plate supported on the top of the mounting plate, a feeding pipe connected to the top of the connecting plate, connecting blocks fixedly connected to both sides of the connecting plate, a fixing rod fixedly connected to the top of the device body, a connecting rod sleeved on the outer wall of the fixing rod, an insert rod slidably connected to the inner wall of the connecting rod, and a connecting spring sleeved on the outer wall of the lower section of the insert rod.

[0008] A further improvement is that the ultrafiltration assembly includes a support frame fixedly connected to the inner wall of the device body, a mounting frame supported on the top of the support frame, a filter membrane fixedly mounted on the inner wall of the mounting frame, fixing blocks fixedly connected to both sides of the inner wall of the device body, a sliding connecting rod slidably connected to the inner wall of the fixing block, a push spring sleeved on the outer wall of the lower section of the sliding connecting rod, and a pressure plate fixedly connected to the lower end of the sliding connecting rod.

[0009] A further improvement is that the push rod is slidably connected to the inner wall of the sleeve, and the threaded push rod is rotatably connected to the inner wall of the device body.

[0010] A further improvement is that the connecting plate is slidably connected to the inner wall of the top of the device body, and the insertion rod is slidably connected to the inner wall of the connecting block.

[0011] A further improvement is that the bottom of the pressure plate abuts against the top of the filter membrane.

[0012] A further improvement is that the pressure plate slides between filter membrane one and filter membrane two, and filter membrane one is arranged in multiple layers.

[0013] By employing the above technical solution, this utility model provides an external reflux device for a landfill leachate ultrafiltration apparatus, which has at least the following beneficial effects:

[0014] 1. This utility model preliminarily purifies landfill leachate by intercepting large-molecule organic matter, colloids, bacteria, and other impurities. A secondary filtration unit further processes the preliminarily purified liquid. A drive motor rotates a threaded push rod, causing the pressure plate to pressurize the liquid on the filter membrane. Combined with a guide plate, this guides the liquid to distribute evenly, achieving finer filtration. The landfill leachate treated by this device exhibits significantly reduced levels of pollutants such as chemical oxygen demand (COD), heavy metal ions, and ammonia nitrogen, meeting stricter discharge standards. This effectively reduces pollution to soil, surface water, and groundwater, significantly improves the quality of the purified water, and powerfully protects the ecological environment.

[0015] 2. The design of this utility model's reflux assembly makes the connection and separation of the connecting plate from the device body extremely convenient. When maintenance or replacement of components such as the feeding pipe is required, simply move the connecting rod to drive the insert rod to overcome the elastic force of the connecting spring and detach from the inner wall of the connecting block, thus easily disassembling the connecting plate. Similarly, connection operations can be quickly completed during installation. This convenient maintenance design reduces equipment downtime and improves equipment utilization efficiency. At the same time, it reduces the manpower and material resources required for complex maintenance operations, lowers maintenance costs, and improves the economic efficiency of device operation. Attached Figure Description

[0016] The accompanying drawings, which are provided to further illustrate this application and form part of this application, illustrate exemplary embodiments of this application and are used to explain this application, but do not constitute an undue limitation of this application.

[0017] In the attached diagram:

[0018] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0019] Figure 2 This is a schematic diagram of the component structure of this utility model;

[0020] Figure 3 This is a schematic diagram of the back-and-forth structure of this utility model;

[0021] Figure 4 This is a partial structural diagram of the recirculation assembly of this utility model;

[0022] Figure 5 This is a partial structural diagram of the re-filtration component of this utility model;

[0023] Figure 6 This is a schematic diagram of the inclined tilting structure of this utility model.

[0024] In the diagram: 1. Device body; 2. Connecting mechanism; 21. Reflux assembly; 211. Mounting plate; 212. Connecting plate; 213. Feed pipe; 214. Connecting block; 215. Fixing rod; 216. Connecting rod; 217. Insert rod; 218. Connecting spring; 22. Ultrafiltration assembly; 221. Receiving frame; 222. Mounting frame; 223. Filter membrane one; 224. Fixing block; 225. Sliding connection 226. Rod; 227. Push spring; 23. Pressure plate; 24. Re-filtration assembly; 25. Drive motor; 26. Threaded push rod; 27. Threaded sleeve; 28. Sliding sleeve; 29. ​​Limiting spring; 20. Push rod; 20. Pressing plate; 21. Filter plate; 22. Receiving partition frame; 23. Filter membrane II; 23. Filter guide plate; 23. Filter guide frame; 23. Filter outlet pipe. Detailed Implementation

[0025] 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.

[0026] Example 1:

[0027] Traditional landfill leachate treatment methods, such as biological treatment, are greatly affected by changes in leachate quality and quantity, resulting in unstable treatment efficiency. They are also ineffective at removing some recalcitrant organic matter and heavy metal ions. While physicochemical treatment methods can remove some pollutants to a certain extent, they are costly and generate large amounts of chemical sludge, making subsequent disposal difficult. With increasingly stringent environmental standards, traditional treatment methods are finding it increasingly difficult to meet new emission standards. This embodiment provides an external reflux device for a landfill leachate ultrafiltration unit. Please refer to [reference needed]. Figures 1-6An embodiment provides an external reflux device for a landfill leachate ultrafiltration apparatus, comprising a device body 1, a connecting mechanism 2, a reflux component 21 disposed in the upper section of the device body 1, an ultrafiltration component 22 disposed in the middle section of the device body 1, and a refiltration component 23 disposed in the lower section of the device body 1; the refiltration component 23 includes a drive motor 231 fixedly mounted on the back of the device body 1, a threaded push rod 232 fixedly connected to the output end of the drive motor 231, a threaded sleeve 233 threadedly connected to the outer wall of the threaded push rod 232, and a sliding sleeve 233 fixedly connected to the outer wall of the threaded sleeve 233. 34. A limiting spring 235 is fixedly connected to the bottom of the inner wall of the sliding sleeve 234. A push rod 236 is fixedly connected to the outer end of the limiting spring 235. A pressure plate 237 is fixedly connected to the outer end of the push rod 236. A filter plate 238 is fixedly connected to the inner wall of the lower section of the device body 1. A receiving partition frame 239 is fixedly connected to the inner wall of the filter plate 238. A filter membrane 2310 is supported at the top of the receiving partition frame 239. Guide plates 2311 are fixedly connected to both sides of the inner wall of the lower section of the device body 1. A guide frame 2312 is fixedly installed at the bottom of the inner wall of the device body 1. A discharge pipe 2313 is connected to the bottom of the guide frame 2312.

[0028] In this embodiment, the re-filtration assembly 23 is located in the lower section of the device body 1; the drive motor 231 is fixedly installed on the back of the device body 1, and its output end is fixedly connected to the threaded push rod 232, which is rotatably connected to the inner wall of the device body 1; the outer wall of the threaded push rod 232 is threadedly connected to the threaded sleeve 233, and the outer wall of the threaded sleeve 233 is fixedly connected to the sliding sleeve 234; when the drive motor 231 starts, it drives the threaded push rod 232 to rotate. Due to the threaded engagement between the threaded sleeve 233 and the threaded push rod 232, the threaded sleeve 233 will move along the axial direction of the threaded push rod 232, thereby driving the sliding sleeve 234 to move; the bottom of the inner wall of the sliding sleeve 234 is fixedly connected to the limiting spring 235, and the outer end of the limiting spring 235 is connected to the push rod 236, which can slide on the inner wall of the sliding sleeve 234. The outer end of the push rod 236 is fixedly connected to the pressure plate 237; the filter plate 238 is fixedly installed on the inner wall of the lower section of the device body 1, and the inner wall of the filter plate 238 is fixedly connected to the receiving partition. The partition frame 239 is used to support the second filter membrane 2310 placed on top of the partition frame 239. The liquid, after being initially filtered by the ultrafiltration module 22, flows onto the second filter membrane 2310. At this time, the drive motor 231 works to move the pressure plate 237 toward the second filter membrane 2310, further pressurizing the liquid on the second filter membrane 2310. The limit spring 235 can play a buffering role during the pressing process to avoid excessive pressure damaging the second filter membrane 2310. The guide plates 2311 are fixedly connected to both sides of the inner wall of the lower section of the device body 1 to guide the liquid to flow toward the second filter membrane 2310, so that the liquid is more evenly distributed on the second filter membrane 2310 for secondary filtration. The guide frame 2312 is fixedly installed at the bottom of the inner wall of the device body 1. The liquid after being filtered again by the second filter membrane 2310 is collected through the guide frame 2312 and finally discharged from the discharge pipe 2313 connected to the bottom of the guide frame 2312, completing the entire ultrafiltration and refiltration process of the landfill leachate and obtaining the purified liquid.

[0029] Furthermore, push rod 236 is slidably connected to the inner wall of sliding sleeve 234, and threaded push rod 232 is rotatably connected to the inner wall of device body 1; pressure plate 237 slides on filter membrane one 223 and filter membrane two 2310, and filter membrane one 223 is arranged in multiple layers.

[0030] Furthermore, the liquid, after initial filtration by the ultrafiltration module 22, flows onto the second filter membrane 2310. At this time, the drive motor 231 operates to move the pressure plate 237 toward the second filter membrane 2310, further pressurizing the liquid on the second filter membrane 2310. The limiting spring 235 can act as a buffer during the pressure process to prevent excessive pressure from damaging the second filter membrane 2310. The guide plates 2311 are fixedly connected to both sides of the lower inner wall of the device body 1 to guide the liquid flow toward the second filter membrane 2310, so that the liquid is more evenly distributed on the second filter membrane 2310 for further filtration. The guide frame 2312 is fixedly installed at the bottom of the inner wall of the device body 1, and the liquid after being filtered again by the second filter membrane 2310 is collected through the guide frame 2312.

[0031] Example 2:

[0032] Based on Embodiment 1, the reflux assembly 21 includes a mounting plate 211 fixedly installed on the top of the device body 1. A connecting plate 212 is supported on the top of the mounting plate 211. A feeding pipe 213 is connected to the top of the connecting plate 212. Connecting blocks 214 are fixedly connected to both sides of the connecting plate 212. A fixing rod 215 is fixedly connected to the top of the device body 1. A connecting rod 216 is sleeved on the outer wall of the fixing rod 215. An insert rod 217 is slidably connected to the inner wall of the connecting rod 216. The lower section of the insert rod 217 is slidably connected to the outer wall of the insert rod 217. A connecting spring 218 is sleeved on the ultrafiltration module 22, which includes a support frame 221 fixedly connected to the inner wall of the device body 1. The top of the support frame 221 supports a mounting frame 222. A filter membrane 223 is fixedly installed on the inner wall of the mounting frame 222. Fixing blocks 224 are fixedly connected to both sides of the inner wall of the device body 1. A sliding connecting rod 225 is slidably connected to the inner wall of the fixing block 224. A push spring 226 is sleeved on the outer wall of the lower section of the sliding connecting rod 225. A pressure plate 227 is fixedly connected to the lower end of the sliding connecting rod 225.

[0033] In this embodiment, the reflux assembly 21 is installed on the top of the device body 1; the mounting plate 211 is fixed to the top of the device body 1, and the connecting plate 212 is supported on the mounting plate 211 and can slide on the inner wall of the top of the device body 1; the top of the connecting plate 212 is connected to a feeding pipe 213 for adding leachate into the device; the connecting blocks 214 on both sides of the connecting plate 212 cooperate with the fixing rod 215 fixed to the top of the device body 1, and the connecting rod 216 is sleeved on the outer wall of the fixing rod 215. The insertion rod 217 is slidable on the inner wall of the connecting rod 216, and a connecting spring 218 is sleeved on the outer wall of the lower section of the insertion rod 217. When it is necessary to install or remove the connecting plate 212, the insertion rod 217 can be moved by moving the connecting rod 216, overcoming the elastic force of the connecting spring 218, so that the insertion rod 217 can be disengaged from or inserted into the inner wall of the connecting block 214, thereby realizing convenient connection and separation between the connecting plate 212 and the device body 1, facilitating the maintenance or replacement of components such as the feeding pipe 213; the ultrafiltration module 22 positions In the middle section of the device body 1; the receiving frame 221 is fixedly connected to the inner wall of the device body 1, and the mounting frame 222 is placed on top of the receiving frame 221. The mounting frame 222 has a filter membrane 223 fixed inside, and the filter membrane 223 is arranged in multiple layers to enhance the filtration effect; the fixing blocks 224 on both sides of the inner wall of the device body 1 are slidably connected to the sliding connecting rods 225. The lower section of the sliding connecting rod 225 is sleeved with a push spring 226, and the lower end is fixedly connected to the pressure plate 227. The bottom of the pressure plate 227 abuts against the filter membrane 223. 23 Top; After the landfill leachate enters the device body 1 from the return component 21, it flows to the ultrafiltration component 22 under its own gravity and the pressure inside the device; The push spring 226 applies downward pressure to the pressure plate 227 through the sliding connecting rod 225, so that the filter membrane 223 is pressed tightly on the mounting frame 222, ensuring the stability of the filtration process; When the leachate passes through the filter membrane 223, the large molecular organic matter, colloids, bacteria and other impurities in it are intercepted, and the preliminarily purified liquid continues to flow downward.

[0034] Furthermore, the connecting plate 212 is slidably connected to the inner wall of the top of the device body 1, and the insertion rod 217 is slidably connected to the inner wall of the connecting block 214; the bottom of the pressure plate 227 abuts against the top of the filter membrane 223.

[0035] Furthermore, by moving the connecting rod 216, the insertion rod 217 is moved, overcoming the elastic force of the connecting spring 218, so that the insertion rod 217 can be disengaged from or inserted into the inner wall of the connecting block 214, thereby realizing convenient connection and separation between the connecting plate 212 and the device body 1, and facilitating the maintenance or replacement of components such as the feeding pipe 213.

[0036] Working principle: The reflux assembly 21 is installed on the top of the device body 1; the mounting plate 211 is fixed on the top of the device body 1, and the connecting plate 212 is supported on the mounting plate 211 and can slide on the inner wall of the top of the device body 1; the top of the connecting plate 212 is connected to the feeding pipe 213 for adding leachate into the device; the connecting blocks 214 on both sides of the connecting plate 212 cooperate with the fixing rod 215 fixed on the top of the device body 1, the connecting rod 216 is sleeved on the outer wall of the fixing rod 215, and the insertion rod 217 can slide on the inner wall of the connecting rod 216, and the lower section of the insertion rod 217 is sleeved on the outer wall of the connecting rod 218; when it is necessary to install or remove the connecting plate 212, the connecting rod 216 can be moved to drive the insertion rod 217 to move, overcome the elastic force of the connecting spring 218, and allow the insertion rod 217 to detach from or insert from the inner wall of the connecting block 214, thereby realizing the convenient connection and separation of the connecting plate 212 and the device body 1, and facilitating the maintenance or replacement of components such as the feeding pipe 213;

[0037] The ultrafiltration module 22 is located in the middle section of the device body 1; the receiving frame 221 is fixedly connected to the inner wall of the device body 1, and the mounting frame 222 is placed on top of the receiving frame 221. A filter membrane 223 is fixed inside the mounting frame 222, and multiple layers of the filter membrane 223 are arranged to enhance the filtration effect; sliding connecting rods 225 are slidably connected inside the fixing blocks 224 on both sides of the inner wall of the device body 1. A push spring 226 is sleeved on the lower outer wall of the sliding connecting rod 225, and a pressure plate 227 is fixedly connected to the lower end. The bottom of the pressure plate 227 abuts against... At the top of filter membrane 223; after the landfill leachate enters the main body 1 from the return assembly 21, it flows to the ultrafiltration assembly 22 under its own gravity and the pressure inside the device; the push spring 226 applies downward pressure to the pressure plate 227 through the sliding connecting rod 225, so that the filter membrane 223 is pressed tightly on the mounting frame 222, ensuring the stability of the filtration process; when the leachate passes through the filter membrane 223, the large molecular organic matter, colloids, bacteria and other impurities in it are intercepted, and the preliminarily purified liquid continues to flow downward;

[0038] The re-filtration assembly 23 is located in the lower section of the device body 1; the drive motor 231 is fixedly installed on the back of the device body 1, and its output end is fixedly connected to the threaded push rod 232, which is rotatably connected to the inner wall of the device body 1; the outer wall of the threaded push rod 232 is threadedly connected to the threaded sleeve 233, and the outer wall of the threaded sleeve 233 is fixedly connected to the sliding sleeve 234; when the drive motor 231 starts, it drives the threaded push rod 232 to rotate. Due to the threaded engagement between the threaded sleeve 233 and the threaded push rod 232, the threaded sleeve 233 will move along the axial direction of the threaded push rod 232, thereby driving the sliding sleeve 234 to move; the bottom of the inner wall of the sliding sleeve 234 is fixedly connected to the limiting spring 235, and the outer end of the limiting spring 235 is connected to the push rod 236, which can slide on the inner wall of the sliding sleeve 234. The outer end of the push rod 236 is fixedly connected to the pressure plate 237; the filter plate 238 is fixedly installed on the inner wall of the lower section of the device body 1, and the inner wall of the filter plate 238 is fixedly connected to the receiving partition frame 23. 9. Filter membrane 2310 is placed on top of the receiving partition frame 239; the liquid, after preliminary filtration by the ultrafiltration component 22, flows onto filter membrane 2310; at this time, the drive motor 231 works to move the pressure plate 237 toward filter membrane 2310, further pressurizing the liquid on filter membrane 2310; the limit spring 235 can buffer during the pressing process to prevent excessive pressure from damaging filter membrane 2310; guide plates 2311 are fixedly connected to both sides of the lower inner wall of the device body 1 to guide the liquid flow toward filter membrane 2310, so that the liquid is more evenly distributed on filter membrane 2310 for secondary filtration; a guide frame 2312 is fixedly installed at the bottom of the inner wall of the device body 1. The liquid after secondary filtration by filter membrane 2310 is collected through the guide frame 2312 and finally discharged from the discharge pipe 2313 connected to the bottom of the guide frame 2312, completing the entire ultrafiltration and refiltration process of the landfill leachate and obtaining purified liquid.

[0039] It should be noted that, in this document, the terms “comprising,” “including,” or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0040] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. An external reflux device for a landfill leachate ultrafiltration apparatus, comprising a device body (1), characterized in that: The device body (1) is provided with a connecting mechanism (2), the connecting mechanism (2) includes a reflux assembly (21) provided in the upper section of the device body (1), an ultrafiltration assembly (22) provided in the middle section of the device body (1), and a refiltration assembly (23) provided in the lower section of the device body (1). The re-filtration assembly (23) includes a drive motor (231) fixedly mounted on the back of the device body (1). A threaded push rod (232) is fixedly connected to the output end of the drive motor (231). A threaded sleeve (233) is threadedly connected to the outer wall of the threaded push rod (232). A sliding sleeve (234) is fixedly connected to the outer wall of the threaded sleeve (233). A limit spring (235) is fixedly connected to the bottom of the inner wall of the sliding sleeve (234). A push rod (236) is fixedly connected to the outer end of the limit spring (235). A pressure plate (237) is fixedly connected to the outer end of the device body (1). A filter plate (238) is fixedly connected to the inner wall of the lower section of the device body (1). A receiving partition frame (239) is fixedly connected to the inner wall of the filter plate (238). A filter membrane (2310) is supported on the top of the receiving partition frame (239). A flow guide plate (2311) is fixedly connected to both sides of the inner wall of the lower section of the device body (1). A flow guide frame (2312) is fixedly installed at the bottom of the inner wall of the device body (1). A discharge pipe (2313) is connected to the bottom of the flow guide frame (2312).

2. The external reflux device for a landfill leachate ultrafiltration apparatus according to claim 1, characterized in that: The reflux assembly (21) includes a mounting plate (211) fixedly installed on the top of the device body (1). A connecting plate (212) is supported on the top of the mounting plate (211). A feeding pipe (213) is connected to the top of the connecting plate (212). Connecting blocks (214) are fixedly connected to both sides of the connecting plate (212). A fixing rod (215) is fixedly connected to the top of the device body (1). A connecting rod (216) is sleeved on the outer wall of the fixing rod (215). An insert rod (217) is slidably connected to the inner wall of the connecting rod (216). A connecting spring (218) is sleeved on the lower section of the insert rod (217).

3. The external reflux device for a landfill leachate ultrafiltration apparatus according to claim 1, characterized in that: The ultrafiltration assembly (22) includes a support frame (221) fixedly connected to the inner wall of the device body (1). The top of the support frame (221) is supported by an mounting frame (222). A filter membrane (223) is fixedly installed on the inner wall of the mounting frame (222). Fixing blocks (224) are fixedly connected to both sides of the inner wall of the device body (1). A sliding connecting rod (225) is slidably connected to the inner wall of the fixing block (224). A push spring (226) is sleeved on the outer wall of the lower section of the sliding connecting rod (225). A pressure plate (227) is fixedly connected to the lower end of the sliding connecting rod (225).

4. The external reflux device for a landfill leachate ultrafiltration apparatus according to claim 1, characterized in that: The push rod (236) is slidably connected to the inner wall of the sleeve (234), and the threaded push rod (232) is rotatably connected to the inner wall of the device body (1).

5. The external reflux device for a landfill leachate ultrafiltration apparatus according to claim 2, characterized in that: The connecting plate (212) is slidably connected to the inner wall of the top of the device body (1), and the insert rod (217) is slidably connected to the inner wall of the connecting block (214).

6. The external reflux device for a landfill leachate ultrafiltration apparatus according to claim 3, characterized in that: The bottom of the pressure plate (227) abuts against the top of the filter membrane (223).

7. The external reflux device for a landfill leachate ultrafiltration apparatus according to claim 1, characterized in that: The pressure plate (237) slides between filter membrane one (223) and filter membrane two (2310), and the filter membrane one (223) is arranged in multiple layers.

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