A multi-stage sewage treatment device and process

Abstract

The application discloses a kind of multistage sewage treatment equipment and process, it is related to sewage treatment technical field, including two first treatment pool, second treatment pool and sedimentation tank, and pumping device is provided on second treatment pool, the top of each first treatment pool is provided with lifting device, the bottom of each lifting device is connected with grid separation structure by connecting frame, the inner side wall of each first treatment pool is provided with shielding extension structure, the application is separated by grid separation structure Large particle solid impurities in first treatment pool are screened, so that large particle solid impurities are left above grid separation structure, the gap between grid separation structure and the inner side wall of first treatment pool is closed by shielding extension structure, it is avoided that sewage directly crosses grid separation structure without being treated, to avoid the influence on sewage treatment effect, in the process of the up and down movement of grid separation structure, shielding extension structure is located outside the movement path of grid separation structure.

Description

Technical Field

[0001] This invention relates to the field of wastewater treatment technology, specifically to a multi-stage wastewater treatment equipment and process. Background Technology

[0002] Wastewater treatment aims to bring wastewater up to the required water quality for discharge into a water body or for reuse. It generally includes industrial wastewater treatment and domestic wastewater treatment. Industrial wastewater includes industrial wastewater, agricultural wastewater, and medical wastewater, and treatment methods include physical, chemical, and biological methods.

[0003] The existing invention patent with publication number CN119118257B discloses a multi-stage potato starch wastewater treatment device. Specifically, it is designed and installed with a solid waste isolation mechanism and a solid waste discharge mechanism. After the lifting frame is driven to rise, the movement of the reciprocating box drives the movable screen to rotate 180 degrees, which facilitates the discharge of solid waste accumulated on the movable screen into the isolation tank. When solid waste is being discharged in one isolation tank, the lifting frame in the other isolation tank descends, and then the descending movable screen blocks the solid waste in the potato starch wastewater, thus circulating the wastewater continuously. This allows the device to continuously block solid waste in the potato starch wastewater and automatically discharge the blocked material.

[0004] However, this invention also has the following drawbacks: When the screen moves in and out of the isolation tank, since the isolation tank is used for sewage treatment, a large number of solid particulate impurities will be attached to the inner wall of the isolation tank. At this time, if there is a gap between the screen and the inner wall of the isolation tank, the particulate impurities in the sewage can easily pass through the screen without being filtered by the screen and enter the filtration tank, affecting the effect of subsequent sewage treatment. If there is no gap between the screen and the inner wall of the isolation tank, the screen can easily be stuck by solid particulate impurities during the movement, causing the screen to be unable to rise and fall normally. Summary of the Invention

[0005] The purpose of this invention is to provide a multi-stage wastewater treatment equipment and process, which solves the problems mentioned in the background art.

[0006] To solve the above-mentioned technical problems, the present invention specifically provides the following technical solution:

[0007] A multi-stage wastewater treatment device includes two first treatment tanks, a second treatment tank, and a sedimentation tank. The two first treatment tanks are arranged side by side and connected to a wastewater pipe. The bottom of each of the two first treatment tanks is connected to the second treatment tank. A pumping device is installed on the second treatment tank to pump wastewater from the second treatment tank to the sedimentation tank. A lifting device is installed at the top of each first treatment tank. Each lifting device is connected to a screen separation structure for screening large solid impurities. When the screen separation structure is located in the corresponding first treatment tank, there is a gap between the screen separation structure and the inner wall of the first treatment tank. A shielding extension structure is installed on the inner side wall of each first treatment tank to close the gap between the screen separation structure and the inner wall of the first treatment tank. The shielding extension structure moves outside the movement path of the screen separation structure when it moves up and down. The two shielding extension structures are installed at different heights in the two first treatment tanks.

[0008] The second treatment tank is equipped with a filtration structure, and the sedimentation tank is equipped with a heating device and a moving device. The moving device is equipped with a scraping structure, which is used to scrape off the impurities that have settled and solidified on the heating device.

[0009] As a preferred embodiment of the present invention, the lifting device includes a gear rotatably mounted on the top edge of the first treatment pool via a support plate. The gear meshes with a toothed plate. The top of the first treatment pool is provided with a lifting groove and a plurality of sliding grooves. The toothed plate is slidably connected in the lifting groove. The plurality of sliding grooves are symmetrically arranged on the top of the first treatment pool and are slidably connected to a lifting bracket. The toothed plate is fixedly connected to one side of the lifting bracket.

[0010] As a preferred embodiment of the present invention, the grid plate separation structure includes multiple connecting rods fixedly connected to the bottom of the lifting support. The multiple connecting rods are divided into two groups and are symmetrical about the center plane of the vertical direction of the first treatment pool. Each group of connecting rods is arranged along a horizontal straight line. The bottom of the two groups of connecting rods is movably connected to a grid plate for separating large particulate solid impurities. The multiple outer walls of the grid plate are parallel to multiple vertical side walls in the first treatment pool. Two positioning magnetic blocks are symmetrically arranged on the grid plate. The two positioning magnetic blocks are magnetically attracted to one of the two groups of connecting rods to define the position of the grid plate.

[0011] As a preferred embodiment of the present invention, two slide bars are symmetrically arranged on the grid plate, and movable grooves are opened on the opposite sides of the two sets of connecting rods. Each slide bar is slidably connected to the movable groove on one of the sets of connecting rods. The two positioning magnetic blocks are respectively arranged on the top of the two slide bars and are attracted to the outermost side of each set of connecting rods.

[0012] As a preferred embodiment of the present invention, the upper surface of the grid plate is wavy.

[0013] As a preferred embodiment of the present invention, the shielding extension structure includes multiple winding assemblies and multiple shielding plates of the same height, and each winding assembly is connected to the corresponding shielding plate by a connecting rope. Multiple side walls in the first processing pool are provided with winding grooves, and multiple winding assemblies are respectively arranged in the corresponding winding grooves. Multiple shielding plates are slidably and sealingly connected to the opening of the winding groove, and can all slide horizontally along the opening of the winding groove to extend into the interior of the first processing pool. Each shielding plate has a spring connected to the inner wall of the winding groove on the side facing away from the interior of the first processing pool.

[0014] Among them, the plurality of shielding plates extend into the first treatment pool and are located above the gap between the grid plate and the inner wall of the first treatment pool, and the portion of the plurality of shielding plates located in the first treatment pool forms an annular plate.

[0015] As a preferred embodiment of the present invention, the bottom of the shielding plate is provided with a baffle strip, and the grid plate is provided with a plurality of isolation grooves that cooperate and connect with the plurality of baffle strips, and the plurality of baffle strips form an annular strip when they come into contact with each other.

[0016] To address the aforementioned technical problems, the present invention also provides a treatment process for a multi-stage wastewater treatment device, the specific steps of which include:

[0017] S100, where a lifting device transports the grid separation structure into the first processing pool, and then the shielding extension structure extends into the first processing pool. The lifting device then controls the grid separation structure to move upward until it abuts against the bottom of the shielding extension structure.

[0018] S200, wastewater is input into the corresponding first treatment tank through the wastewater pipe, and large solid impurities are separated by the screen separation structure. After the first treatment, the wastewater enters the second treatment tank.

[0019] S300, the sewage in the second treatment tank gradually rises and passes through the filtration structure. The sewage that has not passed through the filtration structure is pumped to the sedimentation tank by the pumping device. The heating device heats the sewage and the moving device drives the scraping structure to scrape off the impurities that have settled and solidified on the heating device.

[0020] S400, when large solid particles accumulate and block the screen separation structure, the sewage pipe is closed, the shielding extension structure is removed from the top of the screen separation structure, and the screen separation structure moves upward through the lifting device to detach from the first treatment tank to treat the large solid particles. Another lifting device drives the corresponding screen separation structure to another first treatment tank, and the sewage treatment is repeated according to the above steps.

[0021] Compared with the prior art, the present invention has the following advantages:

[0022] This invention uses a grid separation structure to screen large solid particles in the first treatment tank, ensuring that these particles remain above the grid separation structure. A shielding extension structure seals the gap between the grid separation structure and the inner wall of the first treatment tank, preventing wastewater from directly passing over the grid separation structure without treatment and thus avoiding any impact on the wastewater treatment effect. During the up-and-down movement of the grid separation structure, the shielding extension structure remains outside its movement path, preventing interference with the structure's movement. Furthermore, solid particles adhering to the inner wall of the first treatment tank do not affect the movement of the grid separation structure. Attached Figure Description

[0023] To more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are merely exemplary, and those skilled in the art can derive other embodiments based on the provided drawings without creative effort.

[0024] Figure 1 This is a schematic diagram of the structure of a multi-stage wastewater treatment device provided in an embodiment of the present invention;

[0025] Figure 2 This is a partial structural schematic diagram of a multi-stage wastewater treatment device provided in an embodiment of the present invention;

[0026] Figure 3 This invention provides a side sectional view of a multi-stage wastewater treatment device according to an embodiment of the invention.

[0027] Figure 4 This invention provides a top sectional view of a multi-stage wastewater treatment device according to an embodiment of the invention.

[0028] Figure 5 Provided for embodiments of the present invention Figure 3 An enlarged structural diagram of part A shown in the figure;

[0029] Figure 6 Provided for embodiments of the present invention Figure 4 An enlarged structural diagram of part B shown in the figure;

[0030] Figure 7 A schematic diagram of the grid plate is provided for an embodiment of the present invention;

[0031] Figure 8 A schematic diagram of the shielding plate is provided for an embodiment of the present invention.

[0032] The labels in the diagram represent the following:

[0033] 1. First treatment tank; 2. Second treatment tank; 3. Sedimentation tank; 4. Lifting device; 6. Screen separation structure; 7. Shielding extension structure; 8. Filtration structure; 10. Moving device; 11. Scraping structure;

[0034] 401. Gear; 402. Tooth plate; 403. Lifting groove; 404. Sliding groove; 405. Lifting bracket; 601. Connecting rod; 602. Grid plate; 603. Positioning magnetic block; 604. Sliding bar; 605. Movable groove; 701. Rewinding assembly; 702. Shielding plate; 703. Rewinding groove; 704. Spring; 705. Stop bar; 706. Isolation groove. Detailed Implementation

[0035] 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. Example 1:

[0036] like Figures 1 to 7 As shown, the present invention provides a multi-stage sewage treatment device, including two first treatment tanks 1, a second treatment tank 2, and a sedimentation tank 3. The two first treatment tanks 1 are arranged side by side and are both connected to sewage pipes. The bottom of the two first treatment tanks 1 is connected to the bottom of the second treatment tank 2. A pumping device is provided on the second treatment tank 2 to pump the sewage in the second treatment tank 2 to the sedimentation tank 3. A lifting device 4 is provided on the top of each first treatment tank 1. A screen separation structure 6 for screening large solid impurities is connected to each lifting device 4. When the screen separation structure 6 is located in the corresponding first treatment tank 1, there is a gap between the screen separation structure 6 and the inner wall of the first treatment tank 1. A shielding extension structure 7 is provided on the inner side wall of each first treatment tank 1. The shielding extension structure 7 is used to close the gap between the screen separation structure 6 and the inner wall of the first treatment tank 1, and moves outside the movement path of the screen separation structure 6 when the screen separation structure 6 moves up and down. The two shielding extension structures 7 are set at different heights in the two first treatment tanks 1.

[0037] The second treatment tank 2 is equipped with a filter structure 8, and the sedimentation tank 3 is equipped with a heating device and a moving device 10. The moving device 10 is equipped with a scraping structure 11, which is used to scrape off the impurities that have settled and solidified on the heating device.

[0038] In use, wastewater (potato starch wastewater) is discharged into the corresponding first treatment tank 1 through one of the wastewater pipes and treated by the screen separation structure 6, so that large solid particles in the wastewater remain on the upper surface of the screen separation structure 6. The treated wastewater enters the second treatment tank 2 from the bottom and undergoes a second treatment by the filter structure 8. The wastewater after the second treatment is located above the filter structure 8 and is pumped to the sedimentation tank 3 by the pumping device. After being heated by the heating device, the starch in the wastewater precipitates. At the same time, the moving device 10 drives the scraping structure 11 to move back and forth to scrape off the starch adhering to the surface of the heating device, ensuring the cleanliness of the heating device surface and avoiding the problem of starch solidifying on the surface of the heating device 10 for a long time and becoming difficult to remove later. Furthermore, this device can also be used to treat other wastewater. In this case, the scraping structure 11 is used to remove the impurities deposited on the surface of the heating device, and the heating device can be used as appropriate.

[0039] When a large number of large solid particles accumulate on the surface of the screen separation structure 6, it will affect the treatment effect of the screen separation structure 6 on sewage. At this time, the corresponding sewage pipe is closed, and the shielding extension structure 7 is moved outside the movement path of the screen separation structure 6 to avoid interference with the movement of the screen separation structure 6. Then, the lifting device 4 drives the screen separation structure 6 to move upward to the top of the first treatment tank 1, and then the large solid particles on the screen separation structure 6 can be treated.

[0040] At the same time, another grid separation structure 6 moves downward synchronously under the drive of the lifting device 4 until it enters the corresponding depth in the first treatment tank 1. Then, the shielding extension structure 7 moves to the top of the gap between the grid separation structure 6 and the inner wall of the first treatment tank 1. Then, the lifting device 4 drives the grid separation structure 6 to move upward until it abuts against the bottom of the shielding extension structure 7. At this time, the grid separation structure 6 and the shielding extension structure 7 together divide the first treatment tank 1 into upper and lower spaces. Then, the corresponding sewage pipes are discharged into the sewage for treatment, so that the sewage treatment process is uninterrupted and the sewage treatment effect is guaranteed.

[0041] Furthermore, there is a gap between the grid separation structure 6 and the inner wall of the first treatment tank 1, allowing solid particles attached to the inner wall of the first treatment tank 1 to pass through the gap between the grid separation structure 6 and the inner wall of the first treatment tank 1. This prevents solid particle impurities attached to the inner wall of the first treatment tank 1 from interfering with the normal movement of the grid separation structure 6, and also prevents sewage from passing through the gap between the grid separation structure 6 and the inner wall of the first treatment tank 1, thus ensuring the treatment effect of sewage.

[0042] In this embodiment, the filter structure 8, heating device, moving device 10, and scraping structure 11 are all prior art. For example, the filter structure 8 can be a rotatable filter plate, the heating device can be a flat heating element, the moving device 10 is a motor-driven screw rotation, and the scraping structure 11 is a support frame connected to the scraper, with the support frame mounted on the screw. Alternatively, the filter structure 8, heating device, moving device 10, and scraping structure 11 can also be other technical solutions that achieve the same function, such as the corresponding structures in the invention patent with patent publication number CN119118257B (the filter mechanism corresponds to the filter structure 8, the heating device corresponds to the heating device in this application, and the heating sedimentation mechanism corresponds to the moving device 10 and scraping structure 11 in this application). The technical principles will not be elaborated further here.

[0043] The lifting device 4 includes a gear 401 that is rotatably mounted on the top edge of the first treatment pool 1 via a support plate. The gear 401 meshes with a toothed plate 402. The top of the first treatment pool 1 is provided with a lifting groove 403 and a plurality of sliding grooves 404. The toothed plate 402 is slidably connected in the lifting groove 403. The plurality of sliding grooves 404 are symmetrically arranged on the top of the first treatment pool 1 and are slidably connected to a lifting bracket 405. The toothed plate 402 is fixedly connected to one side of the lifting bracket 405.

[0044] The gear 401 is driven to rotate by a drive device such as a motor. The gear 401 drives the toothed plate 402 to slide along the lifting groove 403, so that the toothed plate 402 moves in the vertical direction, thereby driving the lifting bracket 405 to move up and down in the vertical direction, and then driving the grid plate separation structure 6 to move up and down.

[0045] The grid separation structure 6 includes multiple connecting rods 601 fixedly connected to the bottom of the lifting bracket 405. The multiple connecting rods 601 are divided into two groups and are symmetrical about the center plane of the vertical direction of the first treatment pool 1. Each group of connecting rods 601 is arranged along a horizontal straight line. The bottom of the two groups of connecting rods 601 is movably connected to a grid plate 602 for separating large solid impurities. The periphery of the grid plate 602 is parallel to multiple vertical sidewalls in the first treatment pool 1. Two positioning magnetic blocks 603 are symmetrically arranged on the grid plate 602. The two positioning magnetic blocks 603 are attracted to one of the two groups of connecting rods 601 by magnetic force to limit the position of the grid plate 602.

[0046] When the lifting bracket 405 moves up and down, it drives multiple connecting rods 601 to move up and down synchronously, thereby driving the screen plate 602 to move up and down, so that the screen plate 602 can enter or leave the first treatment tank 1. Two positioning magnetic blocks 603 are attracted to the corresponding connecting rods 601 to restrict the movement of the screen plate 602. The positioning magnetic blocks 603 abut against the corresponding connecting rods 601 to achieve positioning of the screen plate 602, so that the screen plate 602 is always located in the same position below the lifting bracket 405 during each installation, thereby ensuring that the screen plate 602 can accurately enter the first treatment tank 1 to treat sewage.

[0047] Both positioning magnetic blocks 603 are located on the same side of the two sets of connecting rods 601 to avoid interfering with the action of the grid plate 602 disengaging from the connecting rod 601.

[0048] Two sliders 604 are symmetrically arranged on the grid plate 602. Movable grooves 605 are opened on the opposite side of the two sets of connecting rods 601. Each slider 604 is slidably connected in the movable groove 605 on one of the sets of connecting rods 601. Two positioning magnetic blocks 603 are respectively set on the top of the two sliders 604 and are attracted to the outermost side of each set of connecting rods 601.

[0049] After the two sliding bars 604 are engaged in the corresponding movable slots 605, the grid plate 602 can only be moved and disassembled along the direction of each set of connecting rods 602, thus restricting the grid plate 602 from moving in a direction perpendicular to the arrangement of each set of connecting rods 602. Then, the positioning magnetic block 603 is attracted to the outermost connecting rod 601 by magnetic force, which can both restrict the movement of the grid plate 602 along the direction of the arrangement of each set of connecting rods 601 and position the grid plate 602, so that the grid plate 602 is in the same position each time it is installed on multiple connecting rods 602, so that the grid plate 602 can accurately enter the first treatment tank 1 for sewage treatment.

[0050] After the grid plate 602 moves above the first treatment pool 1, a force can be applied to the grid plate 602 in the horizontal direction to disengage the positioning magnetic block 603 from the connecting rod 601, thereby processing the large solid particles accumulated on the grid plate 602. The external force can be applied manually or by a mechanical structure, such as a linear mechanism that can move in the horizontal direction to push the grid plate 602.

[0051] In this embodiment, the grid plate 602 is a plate that can filter large solid particles, such as the movable grid in the invention patent with patent publication number CN119118257B.

[0052] The upper surface of the grid plate 602 is wavy. This increases the contact area between the grid plate 602 and the sewage, improving the treatment efficiency and effect of the sewage. In addition, the wavy depressions can restrict large solid particles from leaving the grid plate 602 when it is separated from the connecting rod 601.

[0053] The shielding extension structure 7 includes multiple winding assemblies 701 and multiple shielding plates 702 of the same height. Each winding assembly 701 is connected to the corresponding shielding plate 702 by a connecting rope. Multiple side walls in the first processing pool 1 are provided with winding grooves 703. Multiple winding assemblies 701 are respectively set in the corresponding winding grooves 703. Multiple shielding plates 702 are slidably and sealingly connected to the opening of the winding grooves 703. They can all slide horizontally along the opening of the winding grooves 703 and extend into the interior of the first processing pool 1. Each shielding plate 702 has a spring 704 connected to the inner wall of the winding groove 703 on the side facing away from the interior of the first processing pool 1.

[0054] Among them, multiple shielding plates 702 extend into the first treatment pool 1 and are located above the gap between the grid plate 602 and the inner wall of the first treatment pool 1. The portion of the multiple shielding plates 702 located inside the first treatment pool 1 forms an annular plate.

[0055] After the grid plate 602 enters the first treatment pool 1, the winding assembly 701 releases the connecting rope. Under the elastic force of the spring 704, the shielding plate 702 moves towards the outside of the winding groove 703 until it reaches above the gap between the grid plate 602 and the inner wall of the first treatment pool 1. Then, the lifting device 4 drives the grid plate 602 upward to contact the bottom of the multiple shielding plates 702. Since one end of the multiple shielding plates 702 forms a complete annular plate after moving into the interior of the first treatment pool 1, The portions of multiple shielding plates 702 extending into the first treatment tank 1 can block sewage, and the bottom of the grid plate 602 contacts the bottom of the multiple shielding plates 702. At the same time, the shielding plate 702 is slidably sealed to the winding groove 703, so that sewage can only enter the area below the grid plate 602 through the grid plate 602, thereby ensuring the treatment effect of sewage. Furthermore, since there is a gap between the grid plate 602 and the inner wall of the first treatment tank 1, the solid particulate impurities attached to the inner wall of the first treatment tank 1 are prevented from affecting the movement of the grid plate 602.

[0056] When one end of the shielding plate 702 moves into the first treatment pool 1, the other end of the shielding plate 702 is located in the winding groove 703, and the spring 704 is in a compressed state, while the connecting rope is in a taut state, thereby fixing the position of the shielding plate 702.

[0057] The winding assembly 701 winds up the connecting rope, causing the shielding plate 702 to move toward the inside of the winding groove 703. The spring 704 is further compressed until the shielding plate 702 is dislodged from above the grid plate 602. Solid impurities attached to the surface of the shielding plate 702 can be scraped off through the groove of the winding groove 703, allowing the shielding plate 702 to move normally.

[0058] In this embodiment, the winding assembly 701 is existing technology, such as a motor-driven roller winding the connecting rope, and the connecting rope moving horizontally by controlling the rotating roller, or other technical solutions are also possible. The technical principles will not be elaborated further.

[0059] Furthermore, the top of the shielding plate 702 is sloped so that solid particulate impurities can slide off the shielding plate 702.

[0060] In this embodiment, because the shielding plate 702 is relatively long, the winding groove 703 will communicate with the lifting groove 403. However, due to the wall thickness of the first processing pool 1, the shielding plate 702 slides along the opening of the winding groove 703 and the inner wall of the first processing pool 1. When the shielding plate 702 extends or retracts along the opening of the winding groove 703, the shielding plate 702 will not interfere with the toothed plate 402.

[0061] The bottom of the shielding plate 702 is provided with a baffle 705, and the grid plate 602 is provided with a plurality of isolation grooves 706 that cooperate and connect with the plurality of baffles 705. When the plurality of baffles 705 come into contact with each other, they form an annular strip.

[0062] When the baffle 705 is inserted into the corresponding isolation groove 706, the cooperation between the baffle 705 and the isolation groove 706 can further restrict the sewage from seeping out between the shielding plate 703 and the grid plate 602 to the bottom of the grid plate 602.

[0063] In use, the grid plate 602 first moves to a position lower than the shielding plate 703. When the shielding plate 703 moves to above the gap between the grid plate 602 and the inner wall of the first treatment pool 1, the lifting device 4 drives the grid plate 602 upward until the baffle 705 enters the corresponding isolation groove 706. Example 2:

[0064] This invention also provides a treatment process for a multi-stage wastewater treatment device, the specific steps of which include:

[0065] S100, where a lifting device 4 transports the grid separation structure 6 into the first processing pool 1, and then the shielding extension structure 7 extends into the first processing pool 1, and the lifting device 4 controls the grid separation structure 6 to move upward until it abuts against the bottom of the shielding extension structure 7.

[0066] S200, wastewater is input into the corresponding first treatment tank 1 through the wastewater pipe, and large solid impurities are separated by the screen separation structure 6. After the first treatment, the wastewater enters the second treatment tank 2.

[0067] S300, the sewage in the second treatment tank 2 gradually rises and passes through the filter structure 8. The sewage that has not passed through the filter structure 8 is pumped to the sedimentation tank 3 by the pumping device. The heating device heats the sewage and the scraping structure 11 is driven by the moving device 10 to scrape off the impurities that have settled and solidified on the heating device.

[0068] S400, when large solid particles accumulate and block the screen separation structure 6, the sewage pipe is closed, the shielding extension structure 7 is removed from the top of the screen separation structure 6, and the screen separation structure 6 moves upward through the lifting device 4 to detach from the first treatment tank 1 to treat the large solid particles. Another lifting device 4 drives the corresponding screen separation structure 6 to another first treatment tank 1, and the sewage treatment is repeated according to the above steps.

[0069] The above embodiments are merely exemplary embodiments of this application and are not intended to limit this application. The scope of protection of this application is defined by the claims. Those skilled in the art can make various modifications or equivalent substitutions to this application within its substance and scope of protection, and such modifications or equivalent substitutions should also be considered to fall within the scope of protection of this application.

Claims

1. A multi-stage wastewater treatment device, comprising two first treatment tanks (1), a second treatment tank (2), and a sedimentation tank (3), wherein the two first treatment tanks (1) are arranged side by side and both are connected to a wastewater pipe, and both first treatment tanks (1) are connected to the bottom of the second treatment tank (2), and a pumping device is provided on the second treatment tank (2), the pumping device being used to pump wastewater in the second treatment tank (2) to the sedimentation tank (3), characterized in that, Each of the first processing pools (1) is provided with a lifting device (4) at the top. Each of the lifting devices (4) is connected with a grid plate separation structure (6) for screening large solid impurities. When the grid plate separation structure (6) is located in the corresponding first processing pool (1), there is a gap between the grid plate separation structure (6) and the inner wall of the first processing pool (1). Each of the first processing pools (1) is provided with a shielding extension structure (7) on its inner side wall. The shielding extension structure (7) is used to close the gap between the grid plate separation structure (6) and the inner wall of the first processing pool (1). When the grid plate separation structure (6) moves up and down, it moves to the outside of the movement path of the grid plate separation structure (6). The two shielding extension structures (7) are set at different heights in the two first processing pools (1). The second treatment tank (2) is equipped with a filter structure (8), and the sedimentation tank (3) is equipped with a heating device and a moving device (10). The moving device (10) is equipped with a scraping structure (11), and the scraping structure (11) is used to scrape off the impurities that have settled and solidified on the heating device. The shielding extension structure (7) includes multiple winding assemblies (701) and multiple shielding plates (702) of the same height, the top of which is a slope.

2. The multi-stage wastewater treatment equipment according to claim 1, characterized in that, The lifting device (4) includes a gear (401) that is rotatably mounted on the top edge of the first treatment pool (1) via a support plate. The gear (401) meshes with a toothed plate (402). The top of the first treatment pool (1) is provided with a lifting groove (403) and a plurality of sliding grooves (404). The toothed plate (402) is slidably connected in the lifting groove (403). The plurality of sliding grooves (404) are symmetrically arranged on the top of the first treatment pool (1) and are slidably connected to a lifting bracket (405). The toothed plate (402) is fixedly connected to one side of the lifting bracket (405).

3. The multi-stage wastewater treatment equipment according to claim 2, characterized in that, The grid separation structure (6) includes multiple connecting rods (601) fixedly connected to the bottom of the lifting bracket (405). The multiple connecting rods (601) are divided into two groups and are symmetrical about the center of the vertical direction of the first treatment pool (1). Each group of connecting rods (601) is arranged along a horizontal straight line. The bottom of the two groups of connecting rods (601) is movably connected to a grid plate (602) for separating large solid impurities. The periphery of the grid plate (602) is parallel to multiple vertical sidewalls in the first treatment pool (1). Two positioning magnetic blocks (603) are symmetrically arranged on the grid plate (602). The two positioning magnetic blocks (603) are attracted to one of the two groups of connecting rods (601) by magnetic force to limit the position of the grid plate (602).

4. A multi-stage wastewater treatment device according to claim 3, characterized in that, Two slide bars (604) are symmetrically arranged on the grid plate (602). Movable grooves (605) are opened on the opposite sides of the two sets of connecting rods (601). Each slide bar (604) is slidably connected in the movable groove (605) on one of the sets of connecting rods (601). Two positioning magnetic blocks (603) are respectively arranged on the top of the two slide bars (604) and respectively attract the outermost side of each set of connecting rods (601).

5. A multi-stage wastewater treatment device according to claim 3, characterized in that, The upper surface of the grid plate (602) is wavy.

6. A multi-stage wastewater treatment device according to claim 3, characterized in that, Each of the winding assembly (701) is connected to the corresponding shielding plate (702) by a connecting rope. Multiple side walls in the first processing pool (1) are provided with winding grooves (703), and multiple winding assemblies (701) are respectively arranged in the corresponding winding grooves (703). Multiple shielding plates (702) are respectively slidably and sealingly connected to the opening of the winding groove (703), and can slide horizontally along the opening of the winding groove (703) to extend into the interior of the first processing pool (1). Each shielding plate (702) has a spring (704) connected to the inner wall of the winding groove (703) on the side facing away from the interior of the first processing pool (1). Among them, the plurality of shielding plates (702) extend into the first treatment pool (1) and are located above the gap between the grid plate (602) and the inner wall of the first treatment pool (1), and the portion of the plurality of shielding plates (702) located in the first treatment pool (1) forms an annular plate.

7. A multi-stage wastewater treatment device according to claim 6, characterized in that, The bottom of the shielding plate (702) is provided with a baffle (705), and the grid plate (602) is provided with a plurality of isolation grooves (706) that cooperate with and connect with the plurality of baffles (705). When the plurality of baffles (705) come into contact with each other, they form annular strips.

8. A treatment process applied to the multi-stage wastewater treatment equipment according to any one of claims 1-7, characterized in that, The specific steps include: S100, where a lifting device (4) transports the grid separation structure (6) into the first processing pool (1), and then the shielding extension structure (7) extends into the first processing pool (1), and the lifting device (4) controls the grid separation structure (6) to move upward to abut against the bottom of the shielding extension structure (7); S200, wastewater is fed into the corresponding first treatment tank (1) through the wastewater pipe, and large solid impurities are separated by the grid separation structure (6). After the first treatment, the wastewater enters the second treatment tank (2). S300, the sewage in the second treatment tank (2) gradually rises and passes through the filter structure (8). The sewage that has not passed through the filter structure (8) is pumped to the sedimentation tank (3) by the pumping device. The heating device heats the sewage and drives the scraping structure (11) to scrape off the impurities that have settled and solidified on the heating device through the moving device (10). S400, when large solid particles accumulate and block the screen separation structure (6), the sewage pipe is closed, the shielding extension structure (7) is removed from the top of the screen separation structure (6), the screen separation structure (6) moves upward through the lifting device (4) to remove the first treatment tank (1) to treat the large solid particles, and another lifting device (4) drives the corresponding screen separation structure (6) to another first treatment tank (1), and repeats the sewage treatment according to the above steps.

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