A landfill leachate treatment device and method thereof

Abstract

This invention relates to the field of wastewater treatment technology, specifically to a treatment device and method for landfill leachate. The device includes a treatment tank containing a horizontally arranged filter plate. A movable base capable of left-right translation is also located within the tank, with filter press components and scraper components spaced horizontally on the base. A sealing mechanism is located below the filter plate within the treatment tank. When the filter press components contact the upper surface of the filter plate to perform filtration, all filter holes are open. When the scraper components contact the upper surface of the filter plate to perform scraping, the sealing mechanism closes all filter holes. This invention, when treating leachate, fully considers its strong adhesive properties. It uses filter press components to squeeze out the liquid from the filter residue, and scraper components to remove the residue. Simultaneously, the sealing mechanism cleans and seals the filter holes, ensuring the overall effectiveness of the leachate treatment process.

Description

Technical Field

[0001] This invention relates to the field of wastewater treatment technology, specifically to a treatment device and method for landfill leachate. Background Technology

[0002] The main sources of landfill leachate include the water contained within the landfill itself, rainwater and snowmelt entering the landfill, surface water, and groundwater. During the stabilization process of a landfill, leachate formation goes through different stages, including initial adjustment, transition, acidification, methanogenesis, and maturation. The composition and properties of the leachate change at each stage.

[0003] A search revealed patent CN118079493B, which discloses a landfill leachate pretreatment device for a landfill compression station. The device includes a pretreatment outer casing, inside which are a filtration chamber, a sludge collection chamber, and a sludge feeding chamber. A filter screen is fixedly connected inside the filtration chamber. A sludge feeding port is located between the filtration chamber and the sludge collection chamber, and a sludge discharge port is located between the sludge collection chamber and the sludge feeding chamber. A cleaning port is located on the pretreatment outer casing corresponding to the sludge feeding chamber. A sludge pushing component is located inside the sludge collection chamber to match the filter screen. A first traction component matches the sludge pushing component. A sealing component is located inside the sludge collection chamber corresponding to the sludge feeding port. A second traction component matches the sealing component. A pushing component is located inside the sludge collection chamber corresponding to the sludge discharge port. A third traction component matches the pushing component. A sludge feeding platform is located inside the sludge feeding chamber corresponding to the sludge discharge port. A fourth traction component matches the sludge feeding platform. This invention relates to the field of wastewater pretreatment devices, which can filter leachate and automatically clean the filter screen, reducing manual labor.

[0004] In the aforementioned technical solutions, after the leachate is filtered through a filter screen, the filter cake is directly pushed out using a sludge pushing component without taking effective measures to squeeze out the liquid from the filter cake. Because leachate itself has extremely strong adhesiveness, if the liquid in the filter cake is not squeezed out, this liquid containing high concentrations of pollutants will remain with the filter cake and, due to its adhesiveness, easily adhere to the filter screen, sludge pushing component, and other subsequent treatment equipment. This not only reduces the filtration efficiency of the filter screen and affects the normal operation of the sludge pushing component but also significantly increases the difficulty and cost of subsequent treatment. Therefore, we propose a leachate treatment device and method to effectively solve the above-mentioned drawbacks. Summary of the Invention

[0005] The purpose of this invention is to provide a treatment device and method for landfill leachate, which solves the problem mentioned in the background art of not squeezing out the leachate from the filter residue.

[0006] The present invention is achieved through the following technical solution: a treatment device for landfill leachate, including a treatment tank, an inlet hopper fixed on the top of the treatment tank, and a filter plate arranged horizontally inside the treatment tank, the filter plate having a plurality of filter holes.

[0007] Inside the processing box, there is a movable seat that can move left and right. Filter presses and scrapers are distributed at intervals along the horizontal direction on the movable seat. Both the filter presses and scrapers can move up and down and are located above the filter plate.

[0008] A sealing mechanism is installed inside the processing box, located below the filter plate. When the filter press contacts the upper surface of the filter plate to perform the filter press operation, each filter hole is in an open state. When the scraper contacts the upper surface of the filter plate to perform the scraping operation, the sealing mechanism closes each filter hole.

[0009] Optionally, an inlet hopper is fixed to the top of the processing tank, a solenoid valve is installed at the bottom outlet of the inlet hopper, and a drain hopper located on the right side of the scraper is fixed on the movable seat. A flexible hose is connected between the drain hopper and the solenoid valve.

[0010] Optionally, the filter press includes a pressure roller arranged along the width direction of the filter plate, and a first T-shaped plate is fixed to the top of the pressure roller. The first T-shaped plate moves vertically through the movable seat.

[0011] Optionally, the slag scraper includes a scraper arranged along the width direction of the filter plate, and a second T-shaped plate is fixed to the top of the scraper, the second T-shaped plate moving through the movable seat in the vertical direction.

[0012] Optionally, a second servo motor is installed at the bottom of the movable seat, and a gear is driven to the output end of the second servo motor. The gear is located between the first T-shaped plate and the second T-shaped plate, and tooth grooves that mesh with the gear are respectively provided on the opposite side of the first T-shaped plate and the second T-shaped plate.

[0013] Optionally, the sealing mechanism includes a frame located below the filter plate, on which sealing pins corresponding to each filter hole are fixed;

[0014] Several sliding rods are fixed on the front and rear sides of the frame, and sliding grooves that match each sliding rod are opened on the inner wall of the processing box.

[0015] Optionally, the filter hole is a straight hole, the sealing needle is a straight needle parallel to the straight hole, and the groove includes a first straight line segment, an oblique line segment and a second straight line segment distributed sequentially from bottom to top;

[0016] When the slide bar is in the first straight segment, the straight needle and the straight hole are completely offset; when the slide bar is in the second straight segment, the straight needle and the straight hole are completely aligned.

[0017] Optionally, the filter hole is an oblique hole, the sealing needle is an oblique needle arranged along the axis of the oblique hole, and the sliding groove is an oblique groove parallel to the oblique hole; when the sliding rod slides from bottom to top along the oblique groove, the oblique needle is inserted into the oblique hole.

[0018] Optionally, a pushing mechanism is installed inside the processing box. The movable end of the pushing mechanism is connected to the frame and is used to push the frame to move up and down along the path of the slide.

[0019] The present invention also provides a method for treating landfill leachate, applicable to the above-mentioned landfill leachate treatment apparatus, comprising the following steps:

[0020] Step 1: The leachate enters the treatment tank and is filtered through the filter plate. The filter residue accumulates on the upper surface of the filter plate.

[0021] Step 2: When the movable seat is located at the left end of the filter plate, the filter press moves downward to contact the upper surface of the filter plate, while the scraper moves upward away from the filter plate, and all filter holes are in the open state.

[0022] Step 3: Move the movable seat to the right, thereby driving the filter press to move along the upper surface of the filter plate to filter the filter residue on the upper surface of the filter plate.

[0023] Step 4: When the moving seat moves to the right end of the filter plate, the scraper moves downward and contacts the upper surface of the filter plate, while the filter press moves upward and away from the filter plate, and the sealing mechanism seals each filter hole.

[0024] Step 5: Move the movable seat to the left, thereby driving the scraper to move along the upper surface of the filter plate and scrape off the filter residue after pressing on the upper surface of the filter plate.

[0025] Compared with the prior art, the present invention provides a treatment device and method for landfill leachate, which has the following beneficial effects:

[0026] 1. This invention, by configuring a filter plate, a movable seat, a filter press, and a scraper, allows the leachate to be filtered through the filter plate. First, the filter press contacts the filter plate and moves to the right along the surface of the filter plate, pressing down the filter residue on the upper surface of the filter plate and significantly reducing its adhesion. Then, the scraper contacts the filter plate and moves to the left along the surface of the filter plate, scraping the filter residue off the filter plate surface. This design effectively prevents filter residue from adhering to the filter plate, the scraper, and subsequent processing equipment, maintaining the cleanliness and efficient operation of the equipment, and reducing the difficulty and cost of subsequent processing.

[0027] 2. This invention, by incorporating a sealing mechanism, ensures that the filter pores remain fully open during the filter pressing process, guaranteeing proper filtration of the leachate. When the scraper is activated to remove the filter residue, the sealing needles insert upwards into the filter pores, pushing out the adhering dirt and simultaneously sealing the pores. This design allows the scraper to thoroughly remove filter residue from the upper surface of the filter plate, ensuring its filtration efficiency and improving the overall cleanliness and efficiency of the equipment.

[0028] 3. This invention, by incorporating a sealing needle, sliding rod, and sliding groove, ensures that the sealing needle and filter holes are staggered during the filtration process. This effectively prevents leachate from directly splashing onto the surface of the sealing needle, avoiding adhesion and solidification of the leachate on the needle. This design ensures that the sealing needle can smoothly and unobstructedly enter the filter holes when needed, thus not affecting the cleaning and sealing effect of the filter holes, and guaranteeing the stable operation and high efficiency of the equipment.

[0029] 4. In treating leachate, this invention fully considers its strong adhesiveness, uses a filter press to squeeze out the liquid from the filter residue, and a scraper to remove the filter residue. At the same time, a sealing mechanism can be used to clean and seal the filter holes to ensure the overall effect of the leachate treatment process and significantly reduce the difficulty and cost of subsequent treatment. Attached Figure Description

[0030] Figure 1 This is a schematic diagram of the external structure of the processing box of the present invention;

[0031] Figure 2 This is a schematic diagram of the internal structure of the processing box of the present invention;

[0032] Figure 3 This is a schematic diagram of the structure of the hose of the present invention;

[0033] Figure 4 This is a schematic diagram of the structure of the movable base of the present invention;

[0034] Figure 5 This is a schematic diagram of the sealing mechanism of the present invention;

[0035] Figure 6 This is a schematic diagram of the internal structure of the housing of the present invention;

[0036] Figure 7 This is a state diagram showing the operation of pressure filtration in Example 2;

[0037] Figure 8 This is a state diagram showing the slag scraping operation performed in Example 2;

[0038] Figure 9 for Figure 8 Enlarged view of point A in the middle;

[0039] Figure 10 This is a state diagram showing the pressure filtration operation in Example 3;

[0040] Figure 11 This is a state diagram of the slag scraping operation performed in Example 3;

[0041] Figure 12 for Figure 11 Enlarged diagram of point B in the middle.

[0042] In the diagram: 1. Processing box; 2. Filter plate; 3. Filter holes; 4. Movable seat; 5. Filter press; 501. Pressure roller; 502. First T-shaped plate; 6. Sludge scraper; 601. Scraper; 602. Second T-shaped plate; 7. Sealing mechanism; 701. Frame; 702. Sealing needle; 703. Slide rod; 704. Slide groove; 8. Lead screw; 9. First servo motor; 10. Guide rod; 11. Inlet hopper; 12. Solenoid valve; 13. Drain hopper; 14. Hose; 15. Second servo motor; 16. Gear; 17. Pushing mechanism; 171. C-shaped support plate; 172. Housing; 173. Iron block; 174. Electromagnet; 175. Connecting rod; 176. Compression spring; 18. Conductive spring; 19. Conductive sheet. Detailed Implementation

[0043] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0044] Example 1: Please refer to Figures 1 to 5 A landfill leachate treatment device includes a treatment tank 1, which provides installation space for other components in the device. An inlet hopper 11 is fixed to the top of the treatment tank 1 for adding leachate into the treatment tank 1. A filter plate 2, arranged horizontally, is fixed inside the treatment tank 1. The filter plate 2 has several filter holes 3 for filtering the leachate, and the filtered residue accumulates on the upper surface of the filter plate 2.

[0045] A movable seat 4 capable of left-right translation is provided inside the processing box 1. In this embodiment, a lead screw 8 arranged horizontally is rotatably connected to the processing box 1. The lead screw 8 and the movable seat 4 are connected by a screw engagement. A first servo motor 9, which is driven by the lead screw 8, is installed on the outer wall of the processing box 1. When the first servo motor 9 is working, it can drive the lead screw 8 to rotate forward or reverse, thereby driving the movable seat 4 to move left or right. A guide rod 10 parallel to the lead screw 8 is fixed on the processing box 1. The guide rod 10 moves through the movable seat 4 and guides the movable seat 4, so that the movable seat 4 can only move along the axial direction of the guide rod 10, preventing the movable seat 4 from rotating with the lead screw 8. In this embodiment, the movable seat 4 can be translated left and right through the cooperation of the first servo motor 9, the lead screw 8, and the guide rod 10.

[0046] In this embodiment, filter press members 5 and scraper members 6 are distributed horizontally at intervals on the movable seat 4. Both filter press members 5 and scraper members 6 can move up and down and are located above the filter plate 2. When the filter press member 5 contacts the upper surface of the filter plate 2 and moves along the length of the filter plate 2, it can press and filter the filter residue accumulated on the upper surface of the filter plate 2, squeeze out the leachate in the filter residue, and reduce the adhesion of the filter residue. When the scraper member 6 contacts the upper surface of the filter plate 2 and moves along the length of the filter plate 2, it can scrape off the filter residue accumulated on the upper surface of the filter plate 2.

[0047] It is worth mentioning that a sealing mechanism 7 is installed inside the treatment box 1, located below the filter plate 2. When the filter press 5 contacts the upper surface of the filter plate 2 and moves to the right to perform the filter press operation, each filter hole 3 is in an open state, thus enabling normal filtration of the leachate. When the scraper 6 contacts the upper surface of the filter plate 2 and moves to the left to perform the scraping operation, the sealing mechanism 7 closes each filter hole 3, allowing the scraper 6 to thoroughly remove the filter residue from the upper surface of the filter plate 2, ensuring the filtration efficiency of the filter plate 2.

[0048] The following is a description of the filter press component 5 and the sludge scraper component 6:

[0049] The filter press 5 includes a pressure roller 501 arranged along the width direction of the filter plate 2. A first T-shaped plate 502 is fixed to the top of the pressure roller 501. The first T-shaped plate 502 moves vertically through the movable seat 4 and can move up and down vertically without falling off the movable seat 4. When the pressure roller 501 contacts the upper surface of the filter plate 2 and rolls along the length direction of the filter plate 2, it can press and filter the filter residue accumulated on the upper surface of the filter plate 2, squeeze out the leachate in the filter residue, thereby reducing the adhesion of the filter residue and making it less likely to stick to other equipment.

[0050] The scraper 6 includes a scraper 601 arranged along the width direction of the filter plate 2. A second T-shaped plate 602 is fixed to the top of the scraper 601. The second T-shaped plate 602 moves vertically through the movable seat 4 and can move up and down vertically without falling off the movable seat 4. When the scraper 601 contacts the upper surface of the filter plate 2 and moves horizontally along the length direction of the filter plate 2, the filter residue accumulated on the upper surface of the filter plate 2 can be pushed out.

[0051] In this embodiment, a second servo motor 15 is installed at the bottom of the movable base 4. A gear 16 is connected to the output end of the second servo motor 15. The gear 16 is located between the first T-shaped plate 502 and the second T-shaped plate 602. Gear slots that mesh with the gear 16 are respectively provided on the opposite sides of the first T-shaped plate 502 and the second T-shaped plate 602. In this embodiment, the cooperation of the second servo motor 15, the gear 16, the first T-shaped plate 502, and the second T-shaped plate 602 drives the filter press 5 and the scraper 6 to move alternately up and down.

[0052] With the above structure, when the second servo motor 15 operates and drives the gear 16 to rotate counterclockwise, it moves the first T-shaped plate 502 downward and simultaneously moves the second T-shaped plate 602 upward. This causes the pressure roller 501 to move downward and contact the filter plate 2, and the scraper 601 to move upward and away from the filter plate 2. When the second servo motor 15 operates and drives the gear 16 to rotate clockwise, it moves the first T-shaped plate 502 upward and simultaneously moves the second T-shaped plate 602 downward. This causes the pressure roller 501 to move upward and away from the filter plate 2, and the scraper 601 to move downward and contact the filter plate 2.

[0053] The sealing mechanism 7 is described below:

[0054] The sealing mechanism 7 includes a frame 701 located below the filter plate 2. Sealing needles 702, corresponding one-to-one with each filter hole 3, are fixed on the frame 701. When the sealing needles 702 are inserted into the filter holes 3 from bottom to top, the filter holes 3 are cleaned and sealed simultaneously. Several sliding rods 703 are fixed on the front and rear sides of the frame 701. A sliding groove 704, which mates with each sliding rod 703, is provided on the inner wall of the processing box 1. When the sliding rods 703 slide within the sliding grooves 704, they guide the frame 701, allowing the sealing needles 702 to smoothly enter the filter holes 3.

[0055] Using the above structure, after the leachate is filtered through the filter plate 2, the filter press 5 moves downward to contact the filter plate 2 and moves to the right along the upper surface of the filter plate 2 to press the filter residue accumulated on the upper surface of the filter plate 2, reducing its adhesion and making it less likely to adhere to subsequent treatment equipment. Then, the scraper 6 moves downward to contact the filter plate 2 and moves to the left along the upper surface of the filter plate 2 to push out the pressed filter residue. During this process, the sealing mechanism 7 seals the filter holes 3, making the upper surface of the filter plate 2 a complete plane, which facilitates the complete scraping away of the filter residue accumulated on the upper surface of the filter plate 2, minimizing residue residue.

[0056] In some embodiments of this application, a solenoid valve 12 is installed at the bottom outlet of the inlet hopper 11 to control the inflow and outflow of leachate. A drain hopper 13 located on the right side of the scraper 6 is fixed on the movable base 4 to evenly discharge the leachate onto the filter plate 2. A flexible hose 14 is electrically connected between the drain hopper 13 and the solenoid valve 12, so that the leachate can flow normally into the drain hopper 13 when the movable base 4 moves left and right.

[0057] With the above structure, the pressure roller 501, scraper 601, and drain hopper 13 are arranged sequentially from left to right and can move synchronously with the movable seat 4. When the movable seat 4 moves to the right, the solenoid valve 12 opens, and the leachate flows through the hose 14 and drain hopper 13 to the filter plate 2 for filtration; then, the pressure roller 501 squeezes the filter residue on the upper surface of the filter plate 2. When the movable seat 4 moves to the left, the solenoid valve 12 closes, no leachate is discharged, and at this time, the scraper 601 scrapes off the filter residue on the upper surface of the filter plate 2.

[0058] In other words, when the movable seat 4 moves to the right, the discharge hopper 13 is always positioned in front of the moving direction to distribute the liquid, and the pressure roller 501 can closely follow to perform pressure filtration, and finally the scraper 601 immediately scrapes it off. This method ensures that the upper surface of the filter plate 2 does not accumulate excessively thick filter residue, thereby ensuring the filtration effect of the leachate.

[0059] Example 2: Please refer to Figures 7 to 9This embodiment also proposes a treatment device for landfill leachate. In this embodiment, the filter hole 3 is a straight hole, the sealing needle 702 is a straight needle parallel to the straight hole, and the slide 704 includes a first straight segment, an oblique segment, and a second straight segment distributed sequentially from bottom to top. When the slide rod 703 is located in the first straight segment, the straight needle and the straight hole are completely offset. When filtering leachate, the leachate is less likely to spray onto the sealing needle 702, thereby ensuring the surface smoothness of the sealing needle 702 and ensuring its accuracy and smoothness in inserting into the filter hole 3. Furthermore, when filtering leachate, since the sealing needle 702 and the filter hole 3 are offset, the filter hole 3 is completely open. This allows the leachate to flow smoothly from the top of the filter plate 2 through the filter hole 3 to the bottom without changing the flow direction or encountering additional resistance due to the presence of the sealing needle 702. The flow path of the leachate remains natural and smooth.

[0060] When the slide bar 703 is located within the second straight segment, the straight needle and the straight hole are fully aligned. At this time, the slide bar 703 moves upward along the second straight segment, which can drive the sealing needle 702 to be inserted normally into the filter hole 3, cleaning and sealing the filter hole 3.

[0061] With the above structure, when filtering leachate or pressing filter cake, the slide rod 703 is located within the first straight section, thus completely offsetting the sealing needle 702 from the filter hole 3. At this time, the filtered leachate is less likely to come into contact with the sealing needle 702, thereby ensuring the smoothness of the sealing needle 702 surface.

[0062] When it is necessary to scrape off the filter residue, the slide bar 703 is first slid along the first straight segment, the oblique segment, and the second straight segment in sequence, so that the sealing needle 702 moves upward first, then moves obliquely upward to fully align with the filter hole 3, and finally inserts upward into the filter hole 3 to clean and seal the filter hole 3, so that the upper surface of the filter plate 2 forms a complete plane. At this time, the scraper 601 moves to the left along the upper surface of the filter plate 2, which can completely scrape off the dirt accumulated on the upper surface of the filter plate 2.

[0063] Example 3: Please refer to Figures 10 to 12 This embodiment also proposes a landfill leachate treatment device. The difference between this embodiment and Embodiment 2 is that the filter hole 3 is an oblique hole, the sealing needle 702 is an oblique needle set along the axis of the oblique hole, and the sliding groove 705 is an oblique groove parallel to the oblique hole. When the sliding rod 703 slides from bottom to top along the oblique groove, the oblique needle is inserted into the oblique hole.

[0064] With the above structure, when cleaning or sealing the filter hole 3 is required, the sealing needle 702 moves directly at an angle and inserts into the filter hole 3. Since the direction of movement of the angled needle is consistent with the inclination direction of the angled hole, the insertion process is smoother, and the shape of the angled needle and the angled hole can be better utilized to quickly achieve sealing. In contrast, in Embodiment 2, the straight needle needs to change its trajectory to insert into the straight hole, requiring a more complex mechanical structure and control method to achieve precise insertion. Compared to this, the operation of this embodiment is more direct and can effectively improve the efficiency of cleaning and sealing.

[0065] Example 4: Please refer to Figures 1 to 6 This embodiment also proposes a landfill leachate treatment device. In this embodiment, a pushing mechanism 17 is installed in the treatment tank 1. The movable end of the pushing mechanism 17 is connected to the frame 701 and is used to push the frame 701 up and down along the path of the slide 704 so that the sealing needle 702 is inserted into the corresponding filter hole 3.

[0066] Specifically, the driving mechanism 17 includes C-shaped support plates 171 movably mounted on the front and rear sides of the frame 701. The C-shaped support plates 171 can drag the frame 701, causing the frame 701 to move up and down, while not affecting the left and right sliding of the frame 701. A housing 172 is fixed inside the processing box 1, located below each C-shaped support plate 171. An iron block 173 slides inside each housing 172. An electromagnet 174 is installed on the inner top of the housing 172 to move the iron block 173 upward. When the electromagnet 174 is energized, the C-shaped support plate 171 is moved upward through the cooperation of the electromagnet 174 and the iron block 173, thereby causing the sealing needle 702 to be inserted into the filter hole 3 along the path of the slide groove 704.

[0067] A connecting rod 175 is fixed to the inner bottom of each housing 172, moving vertically through the iron block 173. The upper end of each connecting rod 175 moves through the housing 172 and is fixed to the corresponding C-shaped support plate 171. A compression spring 176 is sleeved on each connecting rod 175 to reset the iron block 173 downwards. When the electromagnet 174 is de-energized, the iron block 173 can be reset downwards under the action of the compression spring 176, thereby driving the C-shaped support plate 171 to move downwards, and then driving the sealing needle 702 to reset along the path of the slide groove 704, offsetting it from the filter hole 3.

[0068] It is worth mentioning that two conductive springs 18 are fixed to the top of the scraper 6, and the two conductive springs 18 are electrically connected to the positive and negative terminals of the external power supply, respectively. Conductive plates 19, corresponding to each conductive spring 18, are fixed to the top of the movable base 4, and the two conductive plates 19 are electrically connected to the positive and negative terminals of the electromagnet 174, respectively. When the scraper 6 moves downwards and contacts the upper surface of the filter plate 2, each conductive spring 18 contacts its corresponding conductive plate 19, thus energizing the electromagnet 174. The energization and de-energization of the electromagnet 174 are linked to the position of the scraper 6; therefore, the electromagnet 174 is only energized during scraping operations, improving the automation and adaptability of the device.

[0069] With the above structure, when the slag scraping operation is performed, the scraper 601 moves downward and contacts the filter plate 2, thereby causing each conductive spring 18 to contact the corresponding conductive sheet 19, so that the electromagnet 174 is energized. At this time, through the cooperation of the electromagnet 174 and the iron block 173, the C-shaped support plate 171 is driven to move upward, thereby causing the sealing needle 702 to move upward along the path of the slide groove 704 and insert into the filter hole 3 to seal the filter hole 3, so that the upper surface of the filter plate 2 forms a complete plane, which facilitates the scraper 601 to completely clean the upper surface of the filter plate 2. After the slag scraping operation is completed, when the scraper 601 moves upward, since the conductive spring 18 is no longer in contact with the conductive sheet 19, the electromagnet 174 is de-energized. Therefore, under the action of the compression spring 176, the iron block 173 is reset downward, thereby causing the sealing needle 702 to move downward along the path of the slide groove 704 and reset. At this time, the filter hole 3 is in an open state, and the filtration operation can be carried out normally. The opening and closing of filter holes 3 can be synchronized with the filter pressing or slag scraping operation, without the need for a separate control structure, reducing operation steps and making the entire filter pressing or slag scraping process smoother and more efficient.

[0070] Example 5: This example also proposes a method for treating landfill leachate, applicable to the landfill leachate treatment device in Example 4, comprising the following steps:

[0071] Step 1: The leachate enters the treatment tank 1 and is filtered by the filter plate 2. The filter residue is retained on the upper surface of the filter plate 2.

[0072] Step 2: When the movable seat 4 is located at the left end of the filter plate 2, the filter press 5 moves downward to contact the upper surface of the filter plate 2, while the scraper 6 moves upward away from the filter plate 2, and each filter hole 3 is in an open state.

[0073] Step 3: The movable seat 4 moves to the right, thereby driving the filter press 5 to move along the upper surface of the filter plate 2 to filter the filter residue on the upper surface of the filter plate 2.

[0074] During this process, the solenoid valve 12 is energized, and the discharge hopper 13 moves synchronously to the right with the movable seat 4, thereby discharging the leachate to the filter plate 2. Therefore, before pressure filtration, the liquid is first distributed through the discharge hopper 13, and then the filtered residue is pressure filtered by the pressure roller 501, which greatly reduces the waiting time, and the filter residue accumulated on the filter plate 2 will not be too thick, thus not easily affecting the filtration effect of the filter plate 2.

[0075] Step 4: When the moving seat 4 moves to the right end of the filter plate 2, the scraper 6 moves downward to contact the upper surface of the filter plate 2, while the filter press 5 moves upward away from the filter plate 2, and the sealing mechanism 7 seals each filter hole 3.

[0076] During this process, when the scraper 601 moves downward and comes into contact with the filter plate 2, the electromagnet 174 can be energized synchronously through the cooperation of the conductive spring 18 and the conductive sheet 19, so that the sealing needle 702 is automatically inserted into the filter hole 3 to clean and seal the filter hole 3, and make the upper surface of the filter plate 2 form a complete plane, so that the dirt accumulated on the filter plate 2 can be completely scraped off by the scraper 601.

[0077] Step 5: Move the movable seat 4 to the left, thereby driving the scraper 6 to move along the upper surface of the filter plate 2 to scrape off the filter residue after pressing on the upper surface of the filter plate 2.

[0078] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A landfill leachate treatment device, comprising a treatment tank, wherein an inlet hopper is fixed to the top of the treatment tank, characterized in that, The processing box contains a filter plate arranged horizontally, and the filter plate has a number of filter holes. Inside the processing box, there is a movable seat that can move left and right. Filter presses and scrapers are distributed at intervals along the horizontal direction on the movable seat. Both the filter presses and scrapers can move up and down and are located above the filter plate. A sealing mechanism is installed inside the processing box, located below the filter plate. When the filter press contacts the upper surface of the filter plate to perform the filter press operation, each filter hole is in an open state. When the scraper contacts the upper surface of the filter plate to perform the scraping operation, the sealing mechanism closes each filter hole. The sealing mechanism includes a frame located below the filter plate, and sealing pins corresponding to each filter hole are fixed on the frame. Several sliding rods are fixed on the front and rear sides of the frame, and sliding grooves that match each sliding rod are opened on the inner wall of the processing box. The filter hole is a straight hole, the sealing needle is a straight needle parallel to the straight hole, and the groove includes a first straight line segment, an oblique line segment and a second straight line segment distributed sequentially from bottom to top; When the slide bar is in the first straight segment, the straight needle and the straight hole are completely offset; when the slide bar is in the second straight segment, the straight needle and the straight hole are completely aligned. The filter hole is an oblique hole, the sealing needle is an oblique needle set along the axis of the oblique hole, and the sliding groove is an oblique groove parallel to the oblique hole; when the sliding rod slides from bottom to top along the oblique groove, the oblique needle is inserted into the oblique hole.

2. The landfill leachate treatment device according to claim 1, characterized in that: A solenoid valve is installed at the bottom outlet of the liquid inlet hopper, and a liquid discharge hopper located on the right side of the slag scraper is fixed on the movable base. A flexible hose is connected between the liquid discharge hopper and the solenoid valve.

3. The landfill leachate treatment device according to claim 1, characterized in that: The filter press includes a pressure roller arranged along the width of the filter plate, and a first T-shaped plate is fixed to the top of the pressure roller. The first T-shaped plate moves vertically through the movable seat.

4. The landfill leachate treatment device according to claim 3, characterized in that: The slag scraper includes a scraper arranged along the width direction of the filter plate, and a second T-shaped plate is fixed to the top of the scraper. The second T-shaped plate moves vertically through the movable seat.

5. The landfill leachate treatment device according to claim 4, characterized in that: A second servo motor is installed at the bottom of the movable base. The output end of the second servo motor is connected to a gear. The gear is located between the first T-shaped plate and the second T-shaped plate. On the opposite side of the first T-shaped plate and the second T-shaped plate, there are tooth grooves that mesh with the gear.

6. The landfill leachate treatment device according to claim 1, characterized in that: The processing box is equipped with a pushing mechanism, the movable end of which is connected to the frame and is used to push the frame to move up and down along the path of the slide.

7. A method for treating landfill leachate, applicable to the landfill leachate treatment apparatus according to any one of claims 1-6, characterized in that, Includes the following steps: Step 1: The leachate enters the treatment tank and is filtered through the filter plate. The filter residue accumulates on the upper surface of the filter plate. Step 2: When the movable seat is located at the left end of the filter plate, the filter press moves downward to contact the upper surface of the filter plate, while the scraper moves upward away from the filter plate, and all filter holes are in the open state. Step 3: Move the movable seat to the right, thereby driving the filter press to move along the upper surface of the filter plate to filter the filter residue on the upper surface of the filter plate. Step 4: When the moving seat moves to the right end of the filter plate, the scraper moves downward and contacts the upper surface of the filter plate, while the filter press moves upward and away from the filter plate, and the sealing mechanism seals each filter hole. Step 5: Move the movable seat to the left, thereby driving the scraper to move along the upper surface of the filter plate and scrape off the filter residue after pressing on the upper surface of the filter plate.

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