A post-treatment system for garbage leachate

Abstract

The invention relates to the technical field of wastewater treatment, and specifically to a post-treatment system for garbage leachate, comprising a garbage leachate biological treatment tank and a membrane treatment tank, wherein a biological treatment stirring flotation assembly is arranged inside the garbage leachate biological treatment tank, and the beneficial effects are as follows: a stirring scraper movable ring is driven to rotate through a special-shaped stirring tube so that the stirring scraper movable ring contacts and flips with a sewage discharge guide scraper to scrape off the residue on the filter screen and discharge it through a sewage discharge pipe, and then the filter screen is lowered, and an air pump is operated to introduce air to the bottom of the fermentation liquid through the special-shaped stirring tube, and the air is divided into bubbles through a bubble guide cover, and these bubbles contact with suspended matter in the water so that these matter adhere to the surface of the bubbles, float to the water surface, and drive the suspended matter to separate, and the filter screen is raised again, and at the same time, the stirring scraper movable ring and the sewage discharge guide scraper are used to remove the suspended matter, and after repeated several times, the suspended matter in the fermentation liquid can be effectively removed, and the pressure on the nanofiltration membrane is reduced.

Description

Technical Field

[0001] The invention belongs to the technical field of wastewater treatment, and in particular relates to a post-treatment system for garbage leachate. Background Art

[0002] The main purpose of the post-treatment system of landfill leachate is to further purify the landfill leachate after primary treatment to meet the discharge standards or reuse requirements. Such systems usually include the following key steps: Biological treatment: In this stage, microorganisms (bacteria, fungi, etc.) are used to decompose organic matter to further reduce the content of pollutants such as chemical oxygen demand (COD), biological oxygen demand (BOD) and nitrogen and phosphorus; Membrane treatment: Membrane treatment technologies such as microfiltration (MF), ultrafiltration (UF), nanofiltration (NF) and reverse osmosis (RO) are used to further remove suspended solids, dissolved organic matter and some inorganic salts; In addition, in order to meet higher standards of discharge or reuse water quality requirements, deep treatment may be required, including the use of valveless filters, oxygenated slow filters, activated carbon adsorption, ozone oxidation, ultraviolet disinfection and other technologies to remove remaining organic matter, bacteria, viruses and disinfection by-products. The post-treatment system of landfill leachate is often an integration of multiple technologies. According to the actual water quality and treatment objectives, various process units are flexibly combined to effectively remove pollutants, reduce pollution to the environment, and realize the recycling of water resources. In the prior art, the post-treatment system of landfill leachate does not pre-treat the suspended matter contained in the landfill leachate in the early stage of treatment before it enters the membrane treatment link, resulting in excessive pressure on the osmotic membrane and easy clogging of the membrane pores.

[0003] The existing Chinese patent document with publication number CN110759548B proposes to solve the above problems by preparing modified attapulgite with improved adsorption performance and treating the leachate for impurity adsorption. However, since the suspension can flow with the liquid, the adsorption amount is not large and it is easy to clog the adsorption micropores, causing the adsorption effect to deteriorate after a period of adsorption.

[0004] Therefore, the present invention proposes a post-treatment system for garbage leachate, which solves the problem in the prior art that the suspension can flow with the liquid, the adsorption amount is not large, and the adsorption micropores are easily blocked, resulting in the deterioration of the adsorption effect after a period of adsorption. The system pre-treats the suspended matter by adding flotation stirring and interception filtration steps in the early treatment of the garbage leachate, thereby reducing the pressure of membrane treatment. Summary of the invention

[0005] In view of the shortcomings of the prior art, the present invention aims to provide a post-treatment system for landfill leachate to solve the problems raised in the above background technology.

[0006] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a post-treatment system for garbage leachate, comprising a garbage leachate biological treatment tank and a membrane treatment tank, wherein the interior of the garbage leachate biological treatment tank is provided with a biological treatment stirring flotation assembly, and the interior of the membrane treatment tank is provided with a sealing ring assembly and a nanofiltration membrane cleaning assembly, and the biological treatment stirring flotation assembly comprises a special-shaped stirring tube, a stirring scraper movable ring, a sewage discharge guide scraper and a filter screen.

[0007] Preferably, a garbage leachate inlet pipe and a sewage discharge pipe are fixedly installed above the side wall of the garbage leachate biological treatment tank, a liquid level sensor is arranged in the middle of the side wall of the garbage leachate biological treatment tank, the sewage discharge pipe is arranged below the garbage leachate inlet pipe, the height of the liquid level sensor is level with the bottom height of the sewage discharge pipe, and a double-layer sealing cover is arranged on the top of the garbage leachate biological treatment tank.

[0008] Preferably, a suction pump is provided below the garbage leachate biological treatment tank, a suction pipe is fixedly installed on the input pipe end of the suction pump, the upper end of the suction pipe is fixedly connected to the bottom inner wall of the garbage leachate biological treatment tank, a delivery pipe is fixedly installed on the output pipe end of the suction pump, one end of the delivery pipe is fixedly connected to the inner wall of one end of the membrane treatment tank, a slag discharge pipe is fixedly installed below the inner wall of one end of the membrane treatment tank close to the delivery pipe, and a concentrated liquid discharge pipe is fixedly installed above the inner wall of the other end of the membrane treatment tank.

[0009] Preferably, the outer surface of the upper end of the special-shaped stirring tube is rotatably connected to the inner wall of the double-layer sealing cover, a small gear ring is fixedly installed on the outer surface of the special-shaped stirring tube, a bubble guide cover is fixedly installed on the bottom end of the special-shaped stirring tube, bubble holes are evenly distributed on the outer surface of the bubble guide cover, and a guide inclined plate is fixedly installed on the outer surface of the bubble guide cover.

[0010] Preferably, an air pump is fixedly mounted on one side of the upper surface of the double-layer sealing cover, an air inlet pipe is fixedly mounted on the output pipe end of the air pump, the outer surface of the lower end of the air inlet pipe is movably connected to the inner surface of the upper end of the special-shaped stirring tube, a sealing sleeve is jacketed at the connection between the air inlet pipe and the bubble guide cover, a driving motor 1 is fixedly mounted on the other side of the upper surface of the double-layer sealing cover, a gear 1 is fixedly mounted on the lower end of the output shaft of the driving motor 1, and the outer surface of the gear 1 is meshed with the outer surface of the small gear ring.

[0011] Preferably, the stirring scraper movable ring is slidably installed on the outside of the special-shaped stirring tube, and the stirring scraper is rotatably installed on one side surface of the stirring scraper movable ring, and a folding push rod is movably installed on one side surface of the stirring scraper, one end of the folding push rod is movably connected to the outer surface of the stirring scraper movable ring, and a return spring is movably installed in the middle of the folding push rod, and a supporting tripod is fixedly installed on the other side surface of the stirring scraper movable ring, and a butterfly stirring blade is fixedly installed on the upper end of the supporting tripod, and a slide groove compatible with the stirring scraper is provided at the bottom of the butterfly stirring blade, and the sewage discharge guide scraper is arranged on one side of the sewage discharge pipe, and one end of the sewage discharge guide scraper is fixedly connected to the side wall of the garbage leachate biological treatment tank.

[0012] Preferably, a support ring is provided below the filter screen, and the support ring is fixedly installed below the inner surface of the garbage leachate biological treatment tank, a threaded rod is rotatably installed on the upper surface of one side of the support ring, the outer surface of the threaded rod is rotatably connected to the inner wall of the double-layer sealing cover, and a driving motor 2 for driving the threaded rod to rotate is fixedly installed on the upper surface of the double-layer sealing cover, the inner wall of one side of the filter screen is threadedly connected to the outer surface of the threaded rod, and a limiting slide groove adapted to the special-shaped stirring tube is provided in the middle of the inner wall of the filter screen.

[0013] Preferably, the sealing ring assembly is fixedly mounted on the inner wall of one end of the membrane treatment tank away from the conveying pipe, a nanofiltration membrane assembly is fixedly mounted on the middle part of the sealing ring assembly, a guide hemisphere is fixedly mounted on the end of the nanofiltration membrane assembly close to the conveying pipe, a limiting ring is arranged on the outer side of the guide hemisphere, the limiting ring is fixedly mounted on the inner surface of the membrane treatment tank, an inclined scraper is fixedly mounted on the surface of the limiting ring close to the conveying pipe, a central water suction pipe is arranged inside the nanofiltration membrane assembly, one end of the central water suction pipe passes through the sealing ring assembly and a recovered water discharge pipe is fixedly mounted on the inner wall of the membrane treatment tank.

[0014] Preferably, the nanofiltration membrane cleaning assembly includes a rotating ring rotatably mounted on the outer surface of the sealing ring assembly, a large gear ring is fixedly mounted on the outer surface of the rotating ring, a gear 2 is rotatably mounted on the side wall of the sealing ring assembly, a driving motor 3 for driving the gear 2 to rotate is fixedly mounted on the outer surface of the sealing ring assembly, and the outer surface of the gear 2 is meshed with the outer surface of the large gear ring.

[0015] Preferably, a spiral push plate is fixedly installed on the side surface of the rotating circle close to the conveying pipe, and one side surface of the spiral push plate is in contact with the inner surface of the membrane treatment tank, and a secondary filter ring net is fixedly installed on one end of the spiral push plate, and the secondary filter ring net is sleeved on the outside of the guide hemisphere, and the outer surface of the secondary filter ring net is rotatably connected to the inner surface of the limit ring, and the side surface of the secondary filter ring net is in contact with the side surface of the inclined scraper, and a scraper plate is arranged on the inner side of the spiral push plate, and one end of the scraper plate is fixedly connected to the side surface of the rotating circle, and the other end of the scraper plate is fixedly connected to the side surface of the secondary filter ring net, and the inner surface of the scraper plate is in contact with the outer surface of the nanofiltration membrane assembly.

[0016] Compared with the prior art, the present invention has the following beneficial effects:

[0017] The garbage leachate is biologically treated through the garbage leachate biological treatment tank, and the garbage leachate enters the garbage leachate biological treatment tank for biological fermentation. During the fermentation process, gas is discharged through the sewage pipe at intervals. At the same time, the special-shaped stirring tube is driven by the driving motor 1 to rotate and stir the garbage leachate to make it ferment evenly and carry out biological decomposition to the greatest extent. After the fermentation is completed, the driving motor 2 works to make the filter screen rise, filter and lift the solid organic matter in the fermentation liquid, and the stirring scraper movable ring is driven by the special-shaped stirring tube to rotate so that the stirring scraper movable ring contacts and flips with the sewage guide scraper to scrape off the residue on the filter screen and discharge it through the sewage pipe. The filter screen is then lowered, and the air pump is operated to introduce air to the bottom of the fermentation liquid through the special-shaped stirring tube. The air is divided into bubbles through the bubble guide cover. These bubbles come into contact with the suspended matter in the water, so that these substances adhere to the surface of the bubbles and float to the water surface, driving the suspended matter to separate. The filter screen is raised again and the suspended matter is removed by the cooperation of the stirring scraper movable ring and the sewage discharge guide scraper. After repeating several times, the suspended matter in the fermentation liquid can be effectively removed, the pressure on the nanofiltration membrane is reduced, and the problem in the prior art that the suspended liquid can flow with the liquid, the adsorption amount is not large, and the adsorption micropores are easily blocked, resulting in poor adsorption effect after a period of adsorption. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the overall structure of the present invention.

[0019] Figure 2 It is a schematic diagram of the overall cross-sectional structure of the present invention.

[0020] Figure 3 It is a schematic diagram of the cross-sectional structure of the garbage leachate biological treatment tank of the present invention.

[0021] Figure 4 It is a schematic structural diagram of the rising state of the internal filter screen of the garbage leachate biological treatment tank of the present invention.

[0022] Figure 5 It is a schematic diagram of the top view of the structure of the internal filter screen of the garbage leachate biological treatment tank of the present invention in the raised state.

[0023] Figure 6 This is a schematic diagram of the structure of the biological treatment stirring flotation component of the present invention.

[0024] Figure 7 It is a schematic diagram of the structure of the bubble guide cover of the present invention when viewed from above.

[0025] Figure 8 It is a schematic diagram of the external structure of the membrane treatment tank of the present invention.

[0026] Fig. 9 It is a schematic diagram of the cross-sectional structure of the membrane treatment tank of the present invention.

[0027] Fig.10 It is a schematic diagram of the front structure of the cross section of the membrane treatment tank of the present invention.

[0028] Fig.11 It is a schematic diagram of the internal structure of the membrane treatment tank of the present invention.

[0029] Fig.12 It is a schematic diagram of the structure of the nanofiltration membrane cleaning component of the present invention.

[0030] Fig.13 It is a schematic diagram of the enlarged structure of point A of the present invention.

[0031] In the figure: 1. Biotreatment tank for garbage leachate; 11. Garbage leachate inlet pipe; 12. Drain pipe; 13. Suction pump; 14. Suction pipe; 15. Delivery pipe; 16. Double-layer sealing cover; 2. Membrane treatment tank; 21. Slag pipe; 22. Concentrate discharge pipe; 23. Recycled water discharge pipe; 24. Central suction pipe; 3. Biotreatment stirring and flotation assembly; 31. Special-shaped stirring pipe; 311. Small gear ring; 312. Bubble guide cover; 313. Guide inclined plate; 32. Air pump; 321. Inlet pipe; 33. Drive motor 1; 331. Gear 1; 34. Moving ring of stirring scraper; 341. Stirring scraper; 3411. Folding push rod ; 3412, reset spring; 35, butterfly stirring blade; 351, supporting tripod; 36, sewage guide scraper; 361, auxiliary push arc plate; 3611, scraper; 3612, elastic gasket; 362, spring; 37, support ring; 371, threaded rod; 372, drive motor two; 38, filter screen; 4, sealing ring assembly; 41, guide hemisphere; 42, nanofiltration membrane assembly; 5, nanofiltration membrane cleaning assembly; 51, rotating circle; 511, large gear ring; 52, scraper plate; 53, spiral push plate; 54, secondary filter ring net; 55, drive motor three; 56, gear two; 6, limit ring; 61, inclined scraper. DETAILED DESCRIPTION

[0032] In order to make the purpose and technical solution of the present invention clearly and completely described, and the advantages more clearly understood, the embodiments of the present invention are further described in detail with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are part of the embodiments of the present invention, not all of them, and are only used to explain the embodiments of the present invention, and are not used to limit the embodiments of the present invention. All other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0033] Example 1, please refer to Figures 1 to 13 The present invention provides a technical solution: comprising a garbage permeate biological treatment tank 1 and a membrane treatment tank 2, wherein the interior of the garbage permeate biological treatment tank 1 is provided with a biological treatment stirring flotation assembly 3, the interior of the membrane treatment tank 2 is provided with a sealing ring assembly 4 and a nanofiltration membrane cleaning assembly 5, the biological treatment stirring flotation assembly 3 comprises a special-shaped stirring tube 31, a stirring scraper movable ring 34, a sewage guide scraper 36 and a filter screen 38, a garbage permeate inlet pipe 11 and a sewage pipe 12 are fixedly installed above the side wall of the garbage permeate biological treatment tank 1, a liquid level sensor is provided in the middle of the side wall of the garbage permeate biological treatment tank 1, the sewage pipe 12 is provided below the garbage permeate inlet pipe 11, and the liquid level The height of the sensor is level with the bottom height of the sewage pipe 12. A double-layer sealing cover 16 is provided on the top of the garbage leachate biological treatment tank 1. A suction pump 13 is provided below the garbage leachate biological treatment tank 1. A suction pipe 14 is fixedly installed at the input pipe end of the suction pump 13. The upper end of the suction pipe 14 is fixedly connected to the bottom inner wall of the garbage leachate biological treatment tank 1. A delivery pipe 15 is fixedly installed at the output pipe end of the suction pump 13. One end of the delivery pipe 15 is fixedly connected to the inner wall of one end of the membrane treatment tank 2. A slag discharge pipe 21 is fixedly installed below the inner wall of one end of the membrane treatment tank 2 close to the delivery pipe 15. A concentrated liquid discharge pipe 22 is fixedly installed above the inner wall of the other end of the membrane treatment tank 2.

[0034] In this embodiment, the garbage leachate biological treatment tank 1 is mainly used for biological treatment of garbage leachate. Before the garbage leachate enters, the filter screen 38 is ensured to be below the garbage leachate biological treatment tank 1. The garbage leachate enters the garbage leachate biological treatment tank 1 through the garbage leachate inlet pipe 11. After reaching the liquid level, the control valve of the garbage leachate inlet pipe 11 is closed. At this time, the garbage leachate biological treatment tank 1 is in a closed state for biological fermentation. During the fermentation process, the control valve of the sewage pipe 12 is opened at intervals to discharge gas through the sewage pipe 12. At the same time, the drive motor 33 is started, and the drive motor 33 drives the gear 331 to rotate. Because the small gear ring 311 and the gear 331 are meshed with each other, the special-shaped stirring tube 31 is driven by the drive motor 33 to rotate, and the stirring scraper movable ring 34 stirs the garbage leachate. Because the supporting tripod 351 makes the butterfly stirring blade 35 tilt, and the butterfly stirring blade 35 is a specific spiral line, the upper and lower layers of the permeate can be mixed during the rotation process, so that it can be fermented evenly and biodecomposed to the greatest extent. After the fermentation is completed, the driving motor 2 372 is started to make the filter screen 38 rise, and the solid organic matter inside the fermentation liquid is filtered and lifted. The stirring scraper movable ring 34 is driven to rotate through the special-shaped stirring tube 31 so that the stirring scraper movable ring 34 contacts and flips with the sewage discharge guide scraper 36 to scrape the residue on the filter screen 38 and discharge it through the sewage discharge pipe 12. Note that the rotation direction of the special-shaped stirring tube 31 is opposite to the tilt direction of the sewage discharge guide scraper 36, so as to solve the problem in the prior art that the suspension can flow with the liquid, the adsorption amount is not large, and the adsorption micropores are easily blocked, resulting in poor adsorption effect after a period of adsorption.

[0035] Example 2, please refer to Figures 1 to 13On the basis of the first embodiment, in order to remove the suspended matter inside the fermentation liquid, the present embodiment further proposes that the outer surface of the upper end of the special-shaped stirring tube 31 is rotatably connected to the inner wall of the double-layer sealing cover 16, the outer surface of the special-shaped stirring tube 31 is fixedly installed with a small gear ring 311, the bottom end of the special-shaped stirring tube 31 is fixedly installed with a bubble guide cover 312, the outer surface of the bubble guide cover 312 is evenly distributed with bubble holes, the outer surface of the bubble guide cover 312 is fixedly installed with a guide inclined plate 313, the upper surface of the double-layer sealing cover 16 is fixedly installed with an air pump 32, and the output pipe end of the air pump 32 is fixedly installed with an intake pipe 313. 21, the outer surface of the lower end of the air inlet pipe 321 is movably connected with the inner surface of the upper end of the special-shaped stirring tube 31, and a sealing sleeve is provided on the outer surface of the connection between the air inlet pipe 321 and the bubble guide cover 312. A driving motor 133 is fixedly installed on the other side of the upper surface of the double-layer sealing cover 16, and a gear 1331 is fixed on the lower end of the output shaft of the driving motor 133. The outer surface of the gear 1331 is meshed with the outer surface of the small gear ring 311. The stirring scraper movable ring 34 is slidably installed on the outside of the special-shaped stirring tube 31, and a stirring scraper 341 is rotatably installed on one side surface of the stirring scraper movable ring 34. The stirring scraper 341 is A folding push rod 3411 is movably installed on the surface of one side, and one end of the folding push rod 3411 is movably connected to the outer surface of the stirring scraper movable ring 34, and a return spring 3412 is movably installed in the middle of the folding push rod 3411. A supporting tripod 351 is fixedly installed on the other side surface of the stirring scraper movable ring 34, and a butterfly stirring blade 35 is fixedly installed on the upper end of the supporting tripod 351. The bottom of the butterfly stirring blade 35 is provided with a slide groove adapted to the stirring scraper 341. The sewage guide scraper 36 is arranged on one side of the sewage pipe 12, and one end of the sewage guide scraper 36 is connected to the biological treatment of the garbage leachate. The side wall of the treatment tank 1 is fixedly connected, a support ring 37 is arranged below the filter screen 38, the support ring 37 is fixedly installed below the inner surface of the garbage leachate biological treatment tank 1, a threaded rod 371 is rotatably installed on the upper surface of one side of the support ring 37, the outer surface of the threaded rod 371 is rotatably connected to the inner wall of the double-layer sealing cover 16, a driving motor 372 for driving the threaded rod 371 to rotate is fixedly installed on the upper surface of the double-layer sealing cover 16, the inner wall of one side of the filter screen 38 is threadedly connected to the outer surface of the threaded rod 371, and a limiting slide groove adapted to the special-shaped stirring tube 31 is arranged in the middle of the inner wall of the filter screen 38;

[0036] In this embodiment, after the garbage leachate is fermented, the drive motor 2 372 is started to work, so that the filter screen 38 rises to the height of the sewage pipe 12 under the limit cooperation of the special-shaped stirring tube 31, and the stirring scraper movable ring 34 is driven to rise by the filter screen 38. At this time, the special-shaped stirring tube 31 is in a stopped state, and the filter screen 38 rises to filter and lift the solid organic matter in the fermentation liquid. Then the threaded rod 371 stops, and the drive motor 1 33 works again to drive the special-shaped stirring tube 31 to rotate, and the special-shaped stirring tube 31 drives the stirring scraper The movable ring 34 of the plate rotates, so that the stirring scraper 341 scrapes the residue filtered on the filter screen 38. When the stirring scraper 341 rotates to the position of the sewage discharge guide scraper 36, it contacts the sewage discharge guide scraper 36, and the stirring scraper 341 flips over. The folding push rod 3411 is folded, and the return spring 3412 is compressed. The stirring scraper 341 misses the sewage discharge guide scraper 36, so that the sewage discharge guide scraper 36 scrapes the residue on the stirring scraper 341 and discharges it through the sewage discharge pipe 12. After missing, the stirring scraper 341 is folded between the folding push rod 3411 and the return spring 3412. The filter screen 38 is lowered by the reverse rotation of the driving motor 2 372, and the air pump 32 inputs air to the special-shaped stirring tube 31 through the air inlet pipe 321. The special-shaped stirring tube 31 introduces air to the bottom of the fermentation liquid. At this time, the driving motor 1 33 drives the special-shaped stirring tube 31 to rotate again, and the air is divided into tiny bubbles by the rotation of the bubble guide cover 312. These bubbles rise along the guide inclined plate 313 and contact the suspended matter in the water, so that these substances adhere to the surface of the bubbles, float to the water surface and drive the suspended matter to separate. The rotation of the special-shaped stirring tube 31 is stopped again, and the driving motor 2 372 is started to make the filter screen 38 rise. The suspended matter is removed by the cooperation of the stirring scraper movable ring 34 and the sewage guide scraper 36. After repeating several times, the suspended matter in the fermentation liquid can be effectively removed, the pressure of the nanofiltration membrane is reduced, and the problem that the adsorption amount is not large and the adsorption micropores are easily blocked in the prior art, resulting in poor adsorption effect after a period of adsorption, is solved.

[0037] Example 3, please refer to Figures 1 to 13 On the basis of the second embodiment, in order to allow the residue scraped by the sewage guide scraper 36 to smoothly enter the sewage pipe 12 for discharge, this embodiment further proposes that a spring 362 is installed on the surface of the sewage guide scraper 36 corresponding to the stirring scraper 341, and an auxiliary material pushing arc plate 361 is fixedly installed at one end of the spring 362, and the bottom curve of the auxiliary material pushing arc plate 361 is in contact with the inclined curve of the filter screen 38.

[0038] In this embodiment, when the stirring scraper 341 contacts the sewage guide scraper 36, it first squeezes the auxiliary pushing arc plate 361 to make the auxiliary pushing arc plate 361 close to the sewage guide scraper 36, and then when the stirring scraper 341 flips over and misses it, the auxiliary pushing arc plate 361 scrapes the residue on the surface of the stirring scraper 341. When the stirring scraper 341 completely leaves, the spring 362 rebounds to make the auxiliary pushing arc plate 361 move obliquely and shake. At this time, the residue left by the auxiliary pushing arc plate 361 can just smoothly enter the sewage pipe 12 for discharge.

[0039] Example 4, please refer to Figures 1 to 13 On the basis of the third embodiment, in order to enable the auxiliary material pushing arc plate 361 to effectively scrape the floating foam and residue during the contact and flipping process of the stirring scraper 341, the present embodiment further proposes that the side surface of the auxiliary material pushing arc plate 361 away from the spring 362 is evenly distributed with scraping blades 3611, and the scraping blades 3611 are provided in three groups, and the inclination angles of the three groups of scraping blades 3611 are 15°, 30°, and 45° respectively, and an elastic gasket 3612 is fixedly installed between the side surface of the scraping blade 3611 and the side surface of the auxiliary material pushing arc plate 361;

[0040] In this embodiment, three groups of scraping blades 3611 are arranged to be inclined at different angles. The scraping blades 3611 can effectively scrape the floating foam and residue on the surface of the stirring scraper 341 during the contact and flipping process of the stirring scraper 341, so that the floating foam and residue on the surface of the stirring scraper 341 can be discharged as much as possible to avoid being re-integrated into the liquid when the filter screen 38 descends.

[0041] Example 5, please refer to Figures 1 to 13On the basis of the fourth embodiment, in order to make the filtering effect of the membrane treatment tank 2 better, the present embodiment further proposes that the sealing ring assembly 4 is fixedly mounted on the inner wall of the end of the membrane treatment tank 2 away from the conveying pipe 15, a nanofiltration membrane assembly 42 is fixedly mounted in the middle of the sealing ring assembly 4, a guide hemisphere 41 is fixedly mounted on the end of the nanofiltration membrane assembly 42 close to the conveying pipe 15, a limiting ring 6 is arranged on the outer side of the guide hemisphere 41, the limiting ring 6 is fixedly mounted on the inner surface of the membrane treatment tank 2, an inclined scraper 61 is fixedly mounted on the side surface of the limiting ring 6 close to the conveying pipe 15, a central water suction pipe 24 is arranged inside the nanofiltration membrane assembly 42, one end of the central water suction pipe 24 passes through the sealing ring assembly 4, and a recovered water discharge pipe 23 is fixedly mounted on the inner wall of the membrane treatment tank 2, the nanofiltration membrane cleaning assembly 5 includes a rotating ring 51 rotatably mounted on the outer surface of the sealing ring assembly 4, a large gear ring 511 is fixedly mounted on the outer surface of the rotating ring 51, and a gear ring 511 is rotatably mounted on the side wall of the sealing ring assembly 4. Wheel 2 56, a driving motor 3 55 for driving gear 2 56 to rotate is fixedly installed on the outer surface of the sealing ring assembly 4, the outer surface of gear 2 56 is meshed with the outer surface of the large gear ring 511, a spiral push plate 53 is fixedly installed on the side surface of the rotating circle 51 close to the conveying pipe 15, one side surface of the spiral push plate 53 is in contact with the inner surface of the membrane treatment tank 2, one end of the spiral push plate 53 is fixedly installed with a secondary filter ring net 54, the secondary filter ring net 54 is sleeved on the outside of the guide hemisphere 41, the outer surface of the secondary filter ring net 54 is rotatably connected to the inner surface of the limit ring 6, the side surface of the secondary filter ring net 54 is in contact with the side surface of the inclined scraper 61, a scraper plate 52 is arranged on the inner side of the spiral push plate 53, one end of the scraper plate 52 is fixedly connected to the side surface of the rotating circle 51, the other end of the scraper plate 52 is fixedly connected to the side surface of the secondary filter ring net 54, and the inner surface of the scraper plate 52 is in contact with the outer surface of the nanofiltration membrane assembly 42;

[0042] In this embodiment, the suction pump 13 finally works to extract the liquid inside the garbage leachate biological treatment tank 1 through the suction pipe 14, and transports it to the membrane treatment tank 2 through the delivery pipe 15 for nanofiltration. The nanofiltration membrane assembly 42 is a three-layer structure assembly of nanofiltration membrane spacer-nanofiltration membrane-nanofiltration membrane spacer. The liquid on the outside is nanofiltered to remove organic ion substances and inorganic salt substances. The sealing ring assembly 4 increases the sealing performance of the installation place of the nanofiltration membrane assembly 42. The guide hemisphere 41 guides the liquid input by the delivery pipe 15 to flow to the outside of the nanofiltration membrane assembly 42. The secondary filtration ring network 54 performs secondary filtration on the liquid before nanofiltration. The concentrated liquid produced by nanofiltration is discharged through the concentrated liquid discharge pipe 22. After treatment, it can be Used to make liquid fertilizer, water is sucked through the central water suction pipe 24 and discharged through the recycled water discharge pipe 23, and is discharged or recycled after subsequent deep treatment. After a period of use, gear two 56 works to drive the drive motor three 55 to rotate, and the drive motor three 55 drives the large gear ring 511 to rotate to rotate the rotating circle 51, and the scraper plate 52 scrapes and cleans the inner wall of the membrane treatment tank 2, and the spiral pusher plate 53 rotates to push the impurities attached to the outside of the nanofiltration membrane assembly 42 to move toward the concentrated liquid discharge pipe 22, and the limiting ring 6 limits the secondary filter ring net 54. At the same time, the inclined scraper 61 can remove the impurities filtered on the surface of the secondary filter ring net 54, so that the impurities are discharged through the concentrated liquid discharge pipe 22.

[0043] Example 6: Please refer to Figures 1 to 13 Based on the fifth embodiment, this embodiment further proposes a treatment method for a post-treatment system of garbage leachate, comprising the following steps:

[0044] Step 1, fermentation treatment, the garbage leachate enters the garbage leachate biological treatment tank 1 through the garbage leachate inlet pipe 11, and the control valve of the garbage leachate inlet pipe 11 is closed after reaching the liquid level. At this time, the garbage leachate biological treatment tank 1 is in a closed state for biological fermentation. During the fermentation process, the control valve of the sewage pipe 12 is opened at intervals to discharge gas through the sewage pipe 12. At the same time, the drive motor 33 is started, and the drive motor 33 drives the gear 331 to rotate. Because the small gear ring 311 and the gear 331 are meshed with each other, the special-shaped stirring tube 31 is driven by the drive motor 33 to rotate, and the stirring scraper movable ring 34 stirs the garbage leachate to mix the upper and lower layers of the leachate, ferment evenly, and perform biological decomposition to the greatest extent;

[0045] Step 2, filtering. After fermentation, start the second drive motor 372 to make the filter screen 38 rise, filter and lift the solid organic matter in the fermentation liquid, and drive the stirring scraper movable ring 34 to rotate through the special-shaped stirring tube 31 so that the stirring scraper movable ring 34 contacts and flips with the sewage guide scraper 36 to scrape the residue on the filter screen 38 and discharge it through the sewage pipe 12, and then drive the second drive motor 372 to rotate in the opposite direction to make the filter screen 38 descend, and the air pump 32 works to input air into the special-shaped stirring tube 31 through the air inlet pipe 321, and the special-shaped stirring tube 31 introduces air to the bottom of the fermentation liquid At this time, the driving motor 1 33 drives the special-shaped stirring tube 31 to rotate again, and the air is divided into tiny bubbles by the rotation of the bubble guide cover 312. These bubbles rise along the guide inclined plate 313 and contact the suspended matter in the water, so that these substances adhere to the surface of the bubbles and float to the water surface to drive the suspended matter to separate. The special-shaped stirring tube 31 is stopped again, and the driving motor 2 372 is started to make the filter screen 38 rise. The suspended matter is removed by the cooperation of the stirring scraper movable ring 34 and the sewage guide scraper 36. After repeating several times, the suspended matter in the fermentation liquid can be effectively removed;

[0046] Step three, nanofiltration, the suction pump 13 works to extract the liquid inside the garbage leachate biological treatment tank 1 through the suction pipe 14, and transport it to the membrane treatment tank 2 through the delivery pipe 15 for nanofiltration. The guide hemisphere 41 plays a role in guiding the liquid input by the delivery pipe 15 to flow to the outside of the nanofiltration membrane assembly 42. The secondary filtration ring network 54 performs secondary filtration on the liquid before nanofiltration. The concentrated liquid produced by nanofiltration is discharged through the concentrated liquid discharge pipe 22, and can be used to make liquid fertilizer after treatment. The water is sucked through the central water suction pipe 24 and discharged through the recovered water discharge pipe 23.

[0047] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A post-treatment system for landfill leachate, characterized in that: The invention comprises a garbage leachate biological treatment tank (1) and a membrane treatment tank (2), wherein the garbage leachate biological treatment tank (1) is provided with a biological treatment stirring flotation assembly (3), and the membrane treatment tank (2) is provided with a nanofiltration membrane assembly (42), a sealing ring assembly (4) and a nanofiltration membrane cleaning assembly (5), wherein the biological treatment stirring flotation assembly (3) comprises a special-shaped stirring tube (31), a stirring scraper movable ring (34), a sewage discharge guide scraper (36) and a filter screen (38), and the top of the garbage leachate biological treatment tank (1) is provided with a double-layer sealing cover (16), the upper end outer surface of the special-shaped stirring tube (31) is rotatably connected to the inner wall of the double-layer sealing cover (16), and the outer surface of the special-shaped stirring tube (31) is A small gear ring (311) is fixedly mounted, a bubble guide cover (312) is fixedly mounted on the bottom end of the special-shaped stirring tube (31), bubble holes are evenly distributed on the outer surface of the bubble guide cover (312), a guide inclined plate (313) is fixedly mounted on the outer surface of the bubble guide cover (312), an air pump (32) is fixedly mounted on one side of the upper surface of the double-layer sealing cover (16), an air intake pipe (321) is fixedly mounted on the output pipe end of the air pump (32), the outer surface of the lower end of the air intake pipe (321) is movably connected to the inner surface of the upper end of the special-shaped stirring tube (31), a sealing sleeve is sleeved at the connection between the air intake pipe (321) and the bubble guide cover (312), and the other side of the upper surface of the double-layer sealing cover (16) is fixedly mounted. A driving motor (33) is installed, a gear (331) is fixed to the lower end of the output shaft of the driving motor (33), the outer surface of the gear (331) is meshed with the outer surface of the small gear ring (311), the stirring scraper movable ring (34) is slidably installed on the outside of the special-shaped stirring tube (31), a stirring scraper (341) is rotatably installed on one side surface of the stirring scraper movable ring (34), a folding push rod (3411) is movably installed on one side surface of the stirring scraper (341), one end of the folding push rod (3411) is movably connected to the outer surface of the stirring scraper movable ring (34), and a return spring (3412) is movably installed in the middle of the folding push rod (3411), the stirring scraper A supporting tripod (351) is fixedly mounted on the other side surface of the movable ring (34), a butterfly stirring blade (35) is fixedly mounted on the upper end of the supporting tripod (351), a slide groove matched with the stirring scraper (341) is arranged at the bottom of the butterfly stirring blade (35), the sewage discharge guide scraper (36) is arranged on one side of the sewage discharge pipe (12), one end of the sewage discharge guide scraper (36) is fixedly connected to the side wall of the garbage leachate biological treatment tank (1), a supporting ring (37) is arranged below the filter screen (38), the supporting ring (37) is fixedly mounted below the inner surface of the garbage leachate biological treatment tank (1), and a threaded rod (371) is rotatably mounted on the upper surface of one side of the supporting ring (37).The outer surface of the threaded rod (371) is rotatably connected to the inner wall of the double-layer sealing cover (16); a second driving motor (372) for driving the threaded rod (371) to rotate is fixedly mounted on the upper surface of the double-layer sealing cover (16); one side of the filter screen (38) is threadably connected to the outer surface of the threaded rod (371); and a limiting slide groove adapted to the special-shaped stirring tube (31) is provided in the middle of the filter screen (38).

2. A post-processing system for landfill leachate according to claim 1, characterized in that: A garbage leachate inlet pipe (11) and a sewage discharge pipe (12) are fixedly mounted above the side wall of the garbage leachate biological treatment tank (1), a liquid level sensor is arranged in the middle of the side wall of the garbage leachate biological treatment tank (1), the sewage discharge pipe (12) is arranged below the garbage leachate inlet pipe (11), and the height of the liquid level sensor is level with the bottom height of the sewage discharge pipe (12).

3. A post-processing system for landfill leachate according to claim 2, characterized in that: A suction pump (13) is arranged below the waste leachate biological treatment tank (1), a suction pipe (14) is fixedly installed at the input pipe end of the suction pump (13), the upper end of the suction pipe (14) is fixedly connected to the bottom inner wall of the waste leachate biological treatment tank (1), a delivery pipe (15) is fixedly installed at the output pipe end of the suction pump (13), one end of the delivery pipe (15) is fixedly connected to the inner wall of one end of the membrane treatment tank (2), a slag discharge pipe (21) is fixedly installed below the inner wall of one end of the membrane treatment tank (2) close to the delivery pipe (15), and a concentrated liquid discharge pipe (22) is fixedly installed above the inner wall of the other end of the membrane treatment tank (2).

4. A post-processing system for landfill leachate according to claim 3, characterized in that: The sealing ring assembly (4) is fixedly mounted on the inner wall of one end of the membrane treatment tank (2) away from the delivery pipe (15); a nanofiltration membrane assembly (42) is fixedly mounted in the middle of the sealing ring assembly (4); a guide hemisphere (41) is fixedly mounted on one end of the nanofiltration membrane assembly (42) close to the delivery pipe (15); a limit ring (6) is arranged on the outer side of the guide hemisphere (41); the limit ring (6) is fixedly mounted on the inner surface of the membrane treatment tank (2); an inclined scraper (61) is fixedly mounted on the side surface of the limit ring (6) close to the delivery pipe (15); a central water suction pipe (24) is arranged inside the nanofiltration membrane assembly (42); one end of the central water suction pipe (24) passes through the sealing ring assembly (4) and the inner wall of the membrane treatment tank (2) and is fixedly mounted with a recovered water discharge pipe (23).

5. A post-processing system for landfill leachate according to claim 4, characterized in that: The nanofiltration membrane cleaning assembly (5) comprises a rotating ring (51) rotatably mounted on the outer surface of the sealing ring assembly (4); a large gear ring (511) is fixedly mounted on the outer surface of the rotating ring (51); a gear 2 (56) is rotatably mounted on the side wall of the sealing ring assembly (4); a driving motor 3 (55) for driving the gear 2 (56) to rotate is fixedly mounted on the outer surface of the sealing ring assembly (4); and the outer surface of the gear 2 (56) meshes with the outer surface of the large gear ring (511).

6. A post-treatment system for landfill leachate according to claim 5, characterized in that: A spiral push plate (53) is fixedly mounted on a surface of one side of the rotating circle (51) close to the conveying pipe (15), and one side surface of the spiral push plate (53) is in contact with the inner surface of the membrane treatment tank (2). A secondary filter ring net (54) is fixedly mounted on one end of the spiral push plate (53), and the secondary filter ring net (54) is sleeved on the outside of the guide hemisphere (41). The outer surface of the secondary filter ring net (54) is rotatably connected to the inner surface of the limit ring (6), and the side surface of the secondary filter ring net (54) is in contact with the side surface of the inclined scraper (61). A scraper plate (52) is arranged on the inner side of the spiral push plate (53), and one end of the scraper plate (52) is fixedly connected to the side surface of the rotating circle (51), and the other end of the scraper plate (52) is fixedly connected to the side surface of the secondary filter ring net (54), and the inner surface of the scraper plate (52) is in contact with the outer surface of the nanofiltration membrane assembly (42).

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