CN118894621A - A post-treatment system for landfill leachate - Google Patents

Abstract

The invention relates to the technical field of wastewater treatment, in particular to a post-treatment system for landfill leachate, which comprises a landfill leachate biological treatment tank and a membrane treatment tank, wherein a biological treatment stirring air floatation assembly is arranged in the landfill leachate biological treatment tank, and has the beneficial effects that: the special-shaped stirring pipe drives the stirring scraper blade movable ring to rotate, so that the stirring scraper blade movable ring is in contact with the pollution discharge guide scraper blade to overturn, residues on the filter screen are scraped and discharged through the pollution discharge pipe, the filter screen is lowered, the air pump works to introduce air to the bottom of the fermentation liquor through the special-shaped stirring pipe, the air is divided into bubbles through the bubble guide cover, the bubbles are contacted with suspended matters in water, the matters are attached to the surfaces of the bubbles, the bubbles are floated to the water surface to lift and drive the suspended matters to separate, the filter screen is lifted again, the suspended matters are discharged through the cooperation of the stirring scraper blade movable ring and the pollution discharge guide scraper blade, the suspended matters in the fermentation liquor can be effectively removed after repeated times, and the pressure of the nanofiltration membrane is reduced.

Description

A post-treatment system for landfill leachate

Technical Field

The invention belongs to the technical field of wastewater treatment, and in particular relates to a post-treatment system for landfill leachate.

Background Art

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.

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.

Therefore, the present invention proposes a post-treatment system for landfill 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 post-treatment system adds flotation stirring and interception filtration steps to the early treatment of the landfill leachate to pre-treat the suspended matter and reduce the pressure of membrane treatment.

Summary of the invention

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.

To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a post-treatment system for landfill leachate, comprising a landfill leachate biological treatment tank and a membrane treatment tank, wherein the interior of the landfill 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.

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.

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.

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.

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.

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.

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.

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.

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.

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.

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

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

FIG1 is a schematic diagram of the overall structure of the present invention.

FIG. 2 is a schematic diagram of the overall cross-sectional structure of the present invention.

FIG3 is a schematic diagram of the cross-sectional structure of the garbage leachate biological treatment tank of the present invention.

FIG. 4 is a schematic structural diagram of the internal filter screen of the garbage leachate biological treatment tank of the present invention in a rising state.

FIG. 5 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 a raised state.

FIG. 6 is a schematic diagram of the structure of the biological treatment stirring flotation assembly of the present invention.

FIG. 7 is a schematic diagram of the structure of the bubble guide cover of the present invention when viewed from above.

FIG8 is a schematic diagram of the external structure of the membrane treatment tank of the present invention.

FIG. 9 is a schematic diagram of the cross-sectional structure of the membrane treatment tank of the present invention.

FIG. 10 is a schematic diagram of the front structure of the membrane treatment tank of the present invention.

FIG. 11 is a schematic diagram of the internal structure of the membrane treatment tank of the present invention.

FIG. 12 is a schematic diagram of the structure of the nanofiltration membrane cleaning assembly of the present invention.

FIG. 13 is an enlarged structural schematic diagram of point A of the present invention.

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

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.

Embodiment 1, please refer to Figures 1 to 13, the present invention provides a technical solution: including a garbage permeate biological treatment tank 1 and a membrane treatment tank 2, the garbage permeate biological treatment tank 1 is provided with a biological treatment stirring flotation assembly 3, 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 includes 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, and the sewage pipe 12 is provided on the garbage permeate inlet pipe 11. , the height of the liquid level 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 on 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 on 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;

In this embodiment, the membrane treatment tank 2 is mainly used for biological treatment of landfill leachate. Before the landfill leachate enters, the filter screen 38 is ensured to be below the landfill leachate biological treatment tank 1. The landfill leachate enters the landfill leachate biological treatment tank 1 through the landfill leachate inlet pipe 11. After reaching the liquid level, the control valve of the landfill leachate inlet pipe 11 is closed. At this time, the landfill 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 landfill leachate. The tripod 351 tilts the butterfly stirring blade 35, and the butterfly stirring blade 35 is in a specific spiral shape, which can mix the upper and lower layers of the permeate during the rotation process, so that it can be fermented evenly and biodecomposed to the greatest extent. After the fermentation is completed, the drive motor 372 is started to make the filter screen 38 rise, and the solid organic matter in 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, 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 poor adsorption effect after a period of adsorption.

Embodiment 2, please refer to Figures 1 to 13. On the basis of Embodiment 1, in order to remove the suspended matter inside the fermentation liquid, this embodiment further proposes that 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, 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 of the air pump 32 is fixedly installed. The end is fixedly installed with an air inlet pipe 321, 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 arranged on the outer surface of the connection between the air inlet pipe 321 and the bubble guide cover 312. A driving motor 33 is fixedly installed on the other side of the upper surface of the double-layer sealing cover 16, and a gear 331 is fixed on 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, and 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 the surface of one side of the scraper 341, one end of the folding push rod 3411 is movably connected to the outer surface of the stirring scraper movable ring 34, 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 of the stirring scraper movable ring 34, a butterfly stirring blade 35 is fixedly installed on the upper end of the supporting tripod 351, and a sliding groove adapted to the stirring scraper 341 is provided at the bottom of the butterfly stirring blade 35, a 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 garbage infiltrate The side wall of the biological 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;

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.

Embodiment 3, please refer to Figures 1 to 13. On the basis of Embodiment 2, 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 one side 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. The bottom curve of the auxiliary material pushing arc plate 361 fits the inclined curve of the filter screen 38.

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.

Embodiment 4, please refer to FIGS. 1 to 13. On the basis of Embodiment 3, 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, this 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;

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.

Embodiment 5, please refer to Figures 1 to 13. On the basis of embodiment 4, in order to make the filtering effect of the membrane treatment tank 2 better, this embodiment further proposes that the sealing ring assembly 4 is fixedly installed 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 installed in the middle of the sealing ring assembly 4, and a guide hemisphere 41 is fixedly installed 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, and the limiting ring 6 is fixedly installed on the inner surface of the membrane treatment tank 2. An inclined scraper 61 is fixedly installed 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, and 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 installed on the inner wall of the membrane treatment tank 2. The nanofiltration membrane cleaning assembly 5 includes a rotating ring 51 rotatably installed on the outer surface of the sealing ring assembly 4, and a large gear ring 511 is fixedly installed on the outer surface of the rotating ring 51. The side wall of the sealing ring assembly 4 A gear 2 56 is rotatably mounted on the upper surface, 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, the outer surface of the gear 2 56 meshes with the outer surface of the large gear ring 511, a spiral push plate 53 is fixedly mounted on the side surface of the rotating circle 51 close to the conveying pipe 15, one side surface of the spiral push plate 53 contacts 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, 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 contacts 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 contacts the outer surface of the nanofiltration membrane assembly 42;

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.

Embodiment 6, referring to FIGS. 1 to 13 , based on Embodiment 5, this embodiment further proposes a treatment method for a post-treatment system of landfill leachate, comprising the following steps:

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;

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;

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.

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 (10)

1. A post-treatment system for landfill leachate, characterized in that: including rubbish infiltration liquid biological treatment jar (1) and membrane treatment jar (2), the inside of rubbish infiltration liquid biological treatment jar (1) is provided with biological treatment stirring air supporting subassembly (3), the inside of membrane treatment jar (2) is provided with sealing washer subassembly (4) and nanofiltration membrane clearance subassembly (5), biological treatment stirring air supporting subassembly (3) include dysmorphism stirring pipe (31), stirring scraper blade expansion ring (34), blowdown direction scraper blade (36) and filter screen (38).

2. A post-treatment system for landfill leachate according to claim 1, wherein: the garbage infiltration liquid biological treatment tank is characterized in that a garbage infiltration liquid inlet pipe (11) and a sewage draining pipe (12) are fixedly arranged above the side wall of the garbage infiltration liquid biological treatment tank (1), a liquid level sensor is arranged in the middle of the side wall of the garbage infiltration liquid biological treatment tank (1), the sewage draining pipe (12) is arranged below the garbage infiltration liquid inlet pipe (11), the height of the liquid level sensor is equal to the bottom height of the sewage draining pipe (12), and a double-layer sealing cover (16) is arranged at the top of the garbage infiltration liquid biological treatment tank (1).

3. A post-treatment system for landfill leachate according to claim 1, wherein: the utility model discloses a garbage collection tank, including garbage collection tank, membrane treatment tank (2), suction pump (13) are provided with below of garbage infiltration liquid biological treatment tank (1), the input pipe end of suction pump (13) has draft tube (14), the upper end of draft tube (14) and the bottom inner wall fixed connection of garbage infiltration liquid biological treatment tank (1), the output tube end fixed mounting of suction pump (13) has conveyer pipe (15), the one end inner wall fixed connection of conveyer pipe (15) and membrane treatment tank (2), the one end inner wall below fixed mounting that membrane treatment tank (2) are close to conveyer pipe (15) has scum pipe (21), other end inner wall top fixed mounting of membrane treatment tank (2) has concentrate discharge pipe (22).

4. A post-treatment system for landfill leachate according to claim 1, wherein: the upper end surface of dysmorphism stirring pipe (31) is connected with the inner wall rotation of double-deck sealed lid (16), the surface fixed mounting of dysmorphism stirring pipe (31) has ring gear (311), the bottom fixed mounting of dysmorphism stirring pipe (31) has bubble guide cover (312), the surface evenly distributed of bubble guide cover (312) has the gas cell, the surface fixed mounting of bubble guide cover (312) has guide swash plate (313).

5. A post-treatment system for landfill leachate according to claim 2, wherein: the utility model discloses a double-deck sealed lid, including upper surface one side fixed mounting of lid (16) has air pump (32), the output tube end of air pump (32) has intake pipe (321), the lower extreme surface of intake pipe (321) and the upper end internal surface swing joint of dysmorphism stirring pipe (31), the junction overcoat of intake pipe (321) and bubble direction cover (312) has the seal cover, the upper surface opposite side fixed mounting of double-deck sealed lid (16) has driving motor (33), the output shaft lower extreme of driving motor (33) is fixed with gear one (331), the surface and the surface intermeshing of ring gear (311) of gear one (331).

6. A post-treatment system for landfill leachate according to claim 1, wherein: stirring scraper blade expansion ring (34) slidable mounting is in the outside of dysmorphism stirred tank (31), one side surface rotation of stirring scraper blade expansion ring (34) installs stirring scraper blade (341), one side surface movable mounting of stirring scraper blade (341) has folding push rod (3411), the one end and the surface swing joint of stirring scraper blade expansion ring (34) of folding push rod (3411), the middle part movable mounting of folding push rod (3411) has reset spring (3412), the opposite side surface fixed mounting of stirring scraper blade expansion ring (34) has support tripod (351), the upper end fixed mounting of support tripod (351) has butterfly stirring vane (35), the bottom of butterfly stirring vane (35) is provided with the spout with stirring scraper blade (341) looks adaptation, blowdown direction scraper blade (36) set up in one side of blow off pipe (12), the one end and the lateral wall fixed connection of rubbish infiltration liquid biological treatment jar (1) of blowdown direction scraper blade (36).

7. A post-treatment system for landfill leachate according to claim 1, wherein: the utility model discloses a garbage infiltration biological treatment tank, including filter screen (38), threaded rod (371) are installed in the below of the internal surface of garbage infiltration biological treatment tank (1) to the below of filter screen (38), threaded rod (371) are installed in the rotation of one side upper surface of support ring (37), the surface of threaded rod (371) is connected with the inner wall rotation of double-deck sealed lid (16), the upper surface fixed mounting of double-deck sealed lid (16) has drive threaded rod (371) pivoted driving motor two (372), one side inner wall of filter screen (38) and the surface threaded connection of threaded rod (371), the inner wall middle part of filter screen (38) is provided with the spacing spout with special-shaped agitator tube (31) looks adaptation.

8. A post-treatment system for landfill leachate according to claim 1, wherein: sealing washer subassembly (4) fixed mounting is on the one end inner wall that conveyer pipe (15) was kept away from to membrane treatment jar (2), the middle part fixed mounting of sealing washer subassembly (4) has nanofiltration membrane module (42), the one end fixed mounting that nanofiltration membrane module (42) is close to conveyer pipe (15) has water conservancy diversion hemisphere (41), the outside of water conservancy diversion hemisphere (41) is provided with spacing ring (6), spacing ring (6) fixed mounting is on the internal surface of membrane treatment jar (2), one side fixed mounting that spacing ring (6) is close to conveyer pipe (15) has slope doctor-bar (61), the inside of nanofiltration membrane module (42) is provided with central water uptake pipe (24), the one end of central water uptake pipe (24) runs through sealing washer subassembly (4), the inner wall fixed mounting of membrane treatment jar (2) has reclaimed water discharge pipe (23).

9. A post-treatment system for landfill leachate according to claim 1, wherein: the nanofiltration membrane cleaning assembly (5) comprises a rotating ring (51) which is rotatably arranged on the outer surface of the sealing ring assembly (4), a large gear ring (511) is fixedly arranged on the outer side surface of the rotating ring (51), a second gear (56) is rotatably arranged on the side wall of the sealing ring assembly (4), a third driving motor (55) for driving the second gear (56) to rotate is fixedly arranged on the outer side surface of the sealing ring assembly (4), and the outer surface of the second gear (56) is meshed with the outer surface of the large gear ring (511).

10. A post-treatment system for landfill leachate according to claim 9, wherein: one side surface fixed mounting that rotates circle (51) is close to conveyer pipe (15) has spiral pushing plate (53), one side surface of spiral pushing plate (53) contacts with the internal surface of membrane treatment jar (2), the one end fixed mounting of spiral pushing plate (53) has secondary filtration looped netowrk (54), the outside at water conservancy diversion hemisphere (41) is cup jointed to secondary filtration looped netowrk (54), the surface of secondary filtration looped netowrk (54) rotates with the internal surface of spacing ring (6) to be connected, the side surface of secondary filtration looped netowrk (54) contacts with the side surface of slope doctor-bar (61), scrape wallboard (52) have been put to the inboard of spiral pushing plate (53), the one end and the side surface fixed connection of rotating circle (51) of scraping wallboard (52), the other end and the side surface fixed connection of secondary filtration looped netowrk (54) of scraping wallboard (52), the internal surface and the surface that receive filter membrane subassembly (42) contact.