Multi-stage filtration system for effluent from urban wastewater treatment plants

Abstract

This utility model relates to the field of wastewater treatment equipment and discloses a multi-stage filtration device for effluent from urban wastewater treatment plants. The device includes a housing with a top box fixedly connected to the top left side. An air flotation impurity removal mechanism is installed on the rear side of the housing and inside the top box. The air flotation impurity removal mechanism includes a first fixed plate, an air pump, a protective box, a motor, two racks, and a connecting rod. The front side wall of the first fixed plate is fixedly connected to the rear side wall of the housing. This utility model, through its air flotation impurity removal mechanism, solves the problems that reduce the overall treatment efficiency of the filtration device and increase the workload and cost of equipment maintenance. The connecting rod, with its rotatable connection at both ends to the right side inside the top box, effectively improves the sludge removal efficiency of the entire multi-stage filtration device, ensures the stability of the effluent quality, reduces chemical costs, and also reduces potential secondary pollution caused by chemical additions.

Description

Technical Field

[0001] This utility model relates to the field of sewage treatment equipment, and in particular to a multi-stage filtration device for effluent from urban sewage treatment plants. Background Technology

[0002] A multi-stage filtration system for effluent from urban wastewater treatment plants is a device used for the advanced treatment of effluent discharged from urban wastewater treatment plants. It aims to further remove impurities such as suspended solids, organic matter, and microorganisms from the effluent, improve the water quality of the effluent, and enable it to meet higher discharge standards or reuse standards.

[0003] During wastewater filtration, some sludge and impurities are trapped on the surface of the filter media. This sludge gradually accumulates, clogging the pores of the filter media, increasing resistance to wastewater flow, slowing down the filtration speed, and making cleaning the filter media more difficult. This reduces the overall processing efficiency of the filtration system, requiring more frequent and complex cleaning operations, increasing the workload and cost of equipment maintenance. In wastewater treatment, a single screening device may allow a large amount of impurities to directly enter subsequent filtration units or treatment equipment. This increases the processing burden on subsequent equipment, making it more prone to clogging and wear, leading to more frequent cleaning, maintenance, and even replacement, increasing equipment maintenance and operating costs, and reducing system efficiency. Utility Model Content

[0004] The main purpose of this utility model is to provide a multi-stage filtration device for effluent from urban sewage treatment plants. This device can effectively solve the problems that reduce the overall treatment efficiency of the filtration device, require more frequent and complex cleaning operations, increase the workload and cost of equipment maintenance, and lead to more frequent cleaning, maintenance, or even replacement, thereby increasing the maintenance and operating costs of the equipment and reducing the operating efficiency of the system.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a multi-stage filtration device for effluent from urban sewage treatment plants, comprising a housing, a top box fixedly connected to the top left side of the housing, and an air flotation impurity removal mechanism provided on the rear side of the housing and inside the top box;

[0006] The air flotation impurity removal mechanism includes: a first fixed plate, an air pump, a protective box, a motor, two racks, and a connecting rod. The front side wall of the first fixed plate is fixedly connected to the rear side wall of the box. An air tank is fixedly connected to the rear side wall of the first fixed plate. A support plate is fixedly connected to the left side of the rear side wall of the box. The bottom wall of the air pump is fixedly connected to the top of the support plate. A delivery pipe is fixedly connected to the output end of the air pump. The top end of the delivery pipe is connected to the left side wall of the air tank. The bottom of the air tank is connected to an air supply pipe. The top ends of the two air supply pipes are connected to nozzles. The two air supply pipes are connected through the bottom wall of the box.

[0007] Furthermore, the rear side wall of the protective box is fixedly connected to the front side wall of the top box, the bottom wall of the motor is fixedly connected to the inner bottom wall of the protective box, the output end of the motor is fixedly connected to a rotating rod, the rear end of the rotating rod is rotatably connected to the inner rear side wall of the top box, and the outer sides of the front and rear ends of the rotating rod are fixedly connected to first gears, and the outer sides of the two first gears mesh with the inner left side of the two racks.

[0008] Furthermore, the front and rear ends of the connecting rod are rotatably connected to the inside right side of the top box. The outer sides of the front and rear ends of the connecting rod are fixedly connected to second gears. The outer sides of the two second gears mesh with the inside right side of the rack. The outer sides of the two racks are fixedly connected to connecting rings. Each connecting ring has a connecting block inside its inner wall groove. The inner side walls of the front and rear connecting blocks are fixedly connected to support plates. The bottom walls of the multiple support plates are fixedly connected to scrapers.

[0009] Furthermore, a feed pipe is connected through the left side wall of the box, a control panel is fixedly connected to the front side wall of the box, a base is fixedly connected to the bottom left side of the box, a baffle is fixedly connected to the inside of the box, a guide plate is fixedly connected to the top of the baffle, and a water collection tank is fixedly connected to the bottom right side of the box.

[0010] Furthermore, a second guide plate is fixedly connected inside the water collection tank, a drain pipe is connected through the front side wall of the water collection tank, a partition plate is fixedly connected to the right side wall of the baffle and the inside right side of the tank body, a first guide plate is fixedly connected to the top of the partition plate, and a first waste discharge pipe is connected through the right side wall of the tank body.

[0011] Furthermore, the baffle has a guide rail groove inside, and a second fixing plate is slidably connected inside the guide rail groove. A coarse filter plate is fixedly connected inside the second fixing plate, and the front side of the second fixing plate penetrates the front side interior of the box.

[0012] Furthermore, a handle is fixedly connected to the front side wall of the second fixing plate, a support ring is fixedly connected to the bottom right side of the baffle and the inside right side of the box, a fixing ring is provided at the top of the support ring, and an outer frame is fixedly connected inside the fixing ring.

[0013] Furthermore, a fine filter plate is fixedly connected inside the outer frame, and a second row of miscellaneous pipes is connected through the rear side wall of the outer frame. The rear side of the second row of miscellaneous pipes is connected through the rear side wall of the housing, and the second row of miscellaneous pipes is located at the top of the rear side wall of the fine filter plate.

[0014] Compared with the prior art, the present invention has the following beneficial effects:

[0015] 1. This utility model, through its air flotation impurity removal mechanism, solves the problems that reduce the overall filtration efficiency, require more frequent and complex cleaning operations, and increase the workload and cost of equipment maintenance. The connecting rod is rotatably connected to the right side of the top box at both ends. The second gear on the outer side of the connecting rod meshes with the inner right side of the rack, further ensuring the stability and accuracy of the rack's movement. The connecting ring connected to the outer side of the rack moves synchronously with the rack, and the connecting block inside the ring drives the support plate to move. The scrapers connected to the bottom of the multiple support plates then reciprocate across the water surface inside the box, effectively improving the sludge removal efficiency of the entire multi-stage filtration device, ensuring the stability of the effluent quality, reducing chemical costs, and minimizing secondary pollution that may result from chemical additions.

[0016] 2. The system, consisting of a collection tank, guide rails, coarse filter plates, an outer frame, fine filter plates, a second guide plate, and drain pipes, effectively addresses the issue of frequent cleaning, maintenance, and even replacement, which increases equipment maintenance and operating costs and reduces system efficiency. The fine filter plates are fixed inside the outer frame. After coarse filtration, the remaining fine particles, colloids, and some microorganisms in the wastewater are further intercepted and filtered as it flows through the fine filter plates. During fine filtration, impurities gradually accumulate on the surface of the fine filter plates, especially in the top area of ​​the rear sidewall. A second row of pipes, connected through the rear sidewall of the outer frame and located at the top of the rear sidewall of the fine filter plates, promptly discharges the accumulated impurities outside the tank. This prevents excessive accumulation of impurities from clogging the fine filter plates, ensuring continuous and efficient fine filtration, maintaining good filtration results, effectively extending the equipment's lifespan, reducing maintenance costs and replacement frequency, and guaranteeing the normal operation of the entire wastewater treatment system.

[0017] The parts of the device not covered herein are the same as or can be implemented using existing technologies. Attached Figure Description

[0018] Figure 1This is a three-dimensional structural diagram of the multi-stage filtration device for urban sewage treatment plant effluent proposed in this utility model.

[0019] Figure 2 This is a rear structural diagram of the multi-stage filtration device for urban sewage treatment plant effluent proposed in this utility model;

[0020] Figure 3 This is an internal cross-sectional view of the multi-stage filtration device for wastewater effluent from urban sewage treatment plants proposed in this utility model.

[0021] Figure 4 This is a structural diagram of the gas tank of the multi-stage filtration device for urban sewage treatment plant effluent proposed in this utility model;

[0022] Figure 5 This is a structural diagram of the connecting rod of the multi-stage filtration device for urban sewage treatment plant effluent proposed in this utility model;

[0023] Figure 6 This is a structural diagram of the rotating rod of the multi-stage filtration device for urban sewage treatment plant effluent proposed in this utility model;

[0024] Figure 7 This is a schematic diagram of the support plate for the multi-stage filtration device for urban sewage treatment plant effluent proposed in this utility model.

[0025] Figure 8 This is a structural diagram of the coarse filter plate of the multi-stage filtration device for urban sewage treatment plant effluent proposed in this utility model;

[0026] Figure 9 This is a diagram of the baffle structure of the multi-stage filtration device for urban sewage treatment plant effluent proposed in this utility model;

[0027] Figure 10 This is a structural diagram of the second fixed plate of the multi-stage filtration device for urban sewage treatment plant effluent proposed in this utility model;

[0028] Figure 11 This is a structural diagram of the fine filter plate of the multi-stage filtration device for urban sewage treatment plant effluent proposed in this utility model;

[0029] Figure 12 This is a structural diagram of the drainage pipe of the multi-stage filtration device for effluent from urban sewage treatment plants proposed in this utility model.

[0030] Legend:

[0031] 1. Housing; 2. Top box; 3. Air flotation impurity removal mechanism; 301. First fixed plate; 302. Air tank; 303. Support plate; 304. Air pump; 305. Conveying pipe; 306. Air supply pipe; 307. Nozzle; 308. Protective box; 309. Motor; 310. Rotating rod; 311. First gear; 312. Rack; 313. Connecting rod; 314. Second gear; 315. Connecting ring; 316. Connecting block; 317. Support 318. Support plate; 4. Scraper; 5. Feed pipe; 6. Control panel; 7. Base; 8. Baffle; 9. Guide plate; 10. Divider plate; 11. First guide plate; 12. First waste discharge pipe; 13. Water collection tank; 14. Guide rail groove; 15. Second fixing plate; 16. Coarse filter plate; 17. Handle; 18. Support ring; 19. Fixing ring; 20. Outer frame; 21. Fine filter plate; 22. Second waste discharge pipe; 23. Second guide plate; 24. Drain pipe. Detailed Implementation

[0032] To make the technical means, creative features, objectives and effects of this utility model easier to understand, the present utility model will be further described below in conjunction with specific embodiments.

[0033] like Figure 1 - Figure 4 As shown: A multi-stage filtration device for effluent from a municipal wastewater treatment plant includes a housing 1. A top box 2 is fixedly connected to the top left side of the housing 1. An air flotation impurity removal mechanism 3 is installed on the rear side of the housing 1 and inside the top box 2. The top box 2 fixed to the top of the housing 1 provides external support and protection for the air flotation impurity removal mechanism 3 and prevents the odor of the wastewater and pests from coming out of the inside of the housing 1 during wastewater treatment.

[0034] The air flotation impurity removal mechanism 3 includes: a first fixed plate 301, an air pump 304, a protective box 308, a motor 309, two racks 312 and a connecting rod 313. The front side wall of the first fixed plate 301 is fixedly connected to the rear side wall of the box 1. A gas tank 302 is fixedly connected to the rear side wall of the first fixed plate 301. The gas tank 302 is fixed to the rear side wall of the box 1 by the first fixed plate 301, and the gas is stored by the gas tank 302.

[0035] A support plate 303 is fixedly connected to the left side of the rear wall of the housing 1. The bottom wall of the air pump 304 is fixedly connected to the top of the support plate 303. The support plate 303 supports the air pump 304 on top and fixes the air pump 304 to the rear side of the housing 1. A delivery pipe 305 is fixedly connected to the output end of the air pump 304. The top end of the delivery pipe 305 is connected to the left side wall of the air tank 302. The bottom of the air tank 302 is connected to an air supply pipe 306. The top of the front end of each of the two air supply pipes 306 is connected to a nozzle 307. The two air supply pipes 306 are connected through the bottom wall of the housing 1. When in use, after the air pump 304 is started, the gas generated by the air pump 304 is first transferred to the inside of the air tank 302 through the delivery pipe 305 for collection. When sewage needs to be treated, the gas is passed through the air delivery pipe 306 at the bottom of the air tank 302 through the bottom wall of the box 1, and the gas is sprayed from bottom to top inside the box 1 through the nozzle 307 at the front end of the air delivery pipe 306. The gas will generate a large number of bubbles in the sewage, and the bubbles will come into contact with the impurities and sludge inside the sludge. The suspended impurities, sludge and other particulate matter in the sewage will adhere to the surface of the bubbles and float to the surface of the water along with the bubbles.

[0036] like Figure 1 - Figure 7 As shown, the rear side wall of the protective box 308 is fixedly connected to the front side wall of the top box 2, the bottom wall of the motor 309 is fixedly connected to the inner bottom wall of the protective box 308, the output end of the motor 309 is fixedly connected to a rotating rod 310, the rear end of the rotating rod 310 is rotatably connected to the inner rear side wall of the top box 2, and the outer sides of the front and rear ends of the rotating rod 310 are fixedly connected to a first gear 311. After the motor 309 is started, the rotating rod 310 on its output end will rotate accordingly, and the rear end of the rotating rod 310 is rotatably connected to the inner rear side wall of the top box 2 to support the rotating rod 310 and ensure that the rotating rod 310 can rotate stably. When the rotating rod 310 rotates, the first gear 311 on the front and rear ends will also rotate synchronously.

[0037] The outer sides of the two first gears 311 mesh with the inner left side of the two racks 312. The front and rear ends of the connecting rod 313 are rotatably connected to the inner right side of the top box 2. The outer sides of the front and rear ends of the connecting rod 313 are fixedly connected with second gears 314. The outer sides of the two second gears 314 mesh with the inner right side of the racks 312. The connecting rod 313 is rotatably connected to the front and rear side walls of the top box 2 to support the second gears 314 at the front and rear ends of the connecting rod 313. When the rotating rod 310 is driven, the first gears 311 at the front and rear ends of the first gears 311 will mesh with the inner left side of the racks 312 to drive the racks 312 to rotate. The racks 312 will mesh with the second gears 314 on the other side, so that the first gears 311 drive the second gears 314 and the connecting rod 313 to rotate on the inner wall of the top box 2 through the racks 312. The connecting rod 313 and the second gears 314 support the right side of the racks 312.

[0038] Two racks 312 are fixedly connected to the outer sides of each rack. Each connecting ring 315 has a connecting block 316 inside its inner wall groove. Support plates 317 are fixedly connected to the inner side walls of the two connecting blocks 316. Scrapers 318 are fixedly connected to the bottom walls of the multiple support plates 317. When the racks 312 are driven, the outer connecting rings 315 will also rotate. The multiple grooves on the inner wall of the connecting rings 315 are installed and connected to the connecting blocks 316, so that the connecting blocks 316 fix the support plates 317 in the middle of the two connecting rings 315 and drive the support plates 317 to move. The support plates 317 and the scrapers 318 drive the scrapers 318 to scrape the water surface in the tank 1 back and forth. The scrapers 318 push the impurities and sludge that float to the water surface to the right.

[0039] like Figure 1 - Figure 12 As shown, a feed pipe 4 is connected through the left side wall of the tank 1, through which mixed wastewater is transported to the interior of the tank 1 for treatment via external equipment. A control panel 5 is fixedly connected to the front side wall of the tank 1, and a base 6 is fixedly connected to the bottom left side of the tank 1. A baffle 7 is fixedly connected to the interior of the tank 1, dividing the interior of the tank 1 into two areas for sludge treatment. A guide plate 8 is fixedly connected to the top of the baffle 7. When impurities and sludge are pushed to the right by a scraper 318, the scraper 318 contacts the left side of the guide plate 8, pushing the impurities and sludge into the guide plate 8, which then guides the impurities and sludge.

[0040] A water collection tank 12 is fixedly connected to the bottom right side of the tank 1. A second guide plate 22 is fixedly connected inside the water collection tank 12. A drain pipe 23 is connected through the front side wall of the water collection tank 12. The water collection tank 12 is used to collect the filtered sewage, and the second guide plate 22 is used to guide the sludge, so that the treated sewage flows to the drain pipe 23. The drain pipe 23 is connected to external pipes and pumps to discharge the treated water out of the tank 1.

[0041] A partition plate 9 is fixedly connected to the right side wall of the baffle 7 and the inside right side of the box 1. A first guide plate 10 is fixedly connected to the top of the partition plate 9. A first row of miscellaneous pipes 11 are connected through the right side wall of the box 1. The partition plate 9 is used to further divide the right side area of ​​the box 1 into two areas. The top of the partition plate 9 is used as the area for collecting sludge and impurities. First, the sludge and impurities are guided by the guide plate 8, so that the sludge and impurities enter the top of the partition plate 9. Then, the first guide plate 10 at the top of the partition plate 9 guides the sludge and impurities again, so that the sludge and impurities flow to the first row of miscellaneous pipes 11 on the right side. The first row of miscellaneous pipes 11 discharges the impurities into the inside of the box 1. The first guide plate 10 prevents the sludge and impurities from remaining in the top of the partition plate 9. In addition, the bottom area of ​​the partition plate 9 is used to screen the sewage.

[0042] like Figure 1 - Figure 11 As shown, the baffle 7 has a guide rail groove 13 inside, and a second fixing plate 14 is slidably connected inside the guide rail groove 13. A coarse filter plate 15 is fixedly connected inside the second fixing plate 14. The front side of the second fixing plate 14 penetrates the front interior of the housing 1, and a handle 16 is fixedly connected to the front side wall of the second fixing plate 14. The guide rail groove 13 at the bottom of the baffle 7 provides an installation area for the second fixing plate 14, making the installation and removal of the second fixing plate 14 convenient. By fixing the coarse filter plate 15 inside the second fixing plate 14, it is easy to remove and clean the coarse filter plate 15 from the inside of the housing 1. The coarse filter plate 15 performs preliminary filtration of sewage. When the sewage flows to the right, larger particles of impurities, such as branches, stones, and large suspended solids, are intercepted. After interception, the impurities are carried upward by the gas sprayed by the air flotation impurity removal mechanism 3.

[0043] In addition, when it is necessary to clean the impurities on the coarse filter plate 15, the operator only needs to pull the handle 16 on the front side wall of the second fixed plate 14 to pull the second fixed plate 14 and the coarse filter plate 15 out from the front side of the housing 1, so as to conveniently and quickly clean the intercepted impurities, thereby ensuring that the coarse filter plate 15 continues to have good filtration performance.

[0044] A support ring 17 is fixedly connected to the bottom right side of the baffle 7 and the inside right side of the housing 1. A fixing ring 18 is provided at the top of the support ring 17, which supports the bottom of the fixing ring 18. An outer frame 19 is fixedly connected inside the fixing ring 18, and a fine filter plate 20 is fixedly connected inside the outer frame 19. A second row of impurity pipes 21 is connected through the rear side wall of the outer frame 19. The rear side of the second row of impurity pipes 21 is connected through the rear side wall of the housing 1. The second row of impurity pipes 21 is located at the top of the rear side wall of the fine filter plate 20. The outer frame 19 inside the fixing ring 18 provides external fixation and support for the fine filter plate 20, so that the water flowing to the right after the initial filtration by the coarse filter plate 15 is finely sieved. During the fine filtration process, impurities gradually accumulate on the surface of the fine filter plate 20.

[0045] According to such Figure 11 As shown, the fine filter plate 20 is installed inside the outer frame 19 at an angle of 30-40 degrees. This allows impurities on the fine filter plate 20 to flow towards the second discharge pipe 21 through the inclined setting. The second discharge pipe 21 then discharges the impurities and sludge into the interior of the housing 1. The filtered water flows into the water collection tank 12 through the pores of the fine filter plate 20 for collection.

[0046] It should be noted that this utility model is a multi-stage filtration device for effluent from urban sewage treatment plants. First, the air pump 304, motor 309, and control panel 5 are connected to an external power source to supply power to the device.

[0047] Air pump 304, serving as the air source power device, is mounted on pallet 303, which is fixed to the left side of the rear wall of housing 1. After starting, air pump 304 compresses air and delivers it to air tank 302 for storage via delivery pipe 305. Air tank 302 is fixed to the rear wall of first fixing plate 301, while the front wall of first fixing plate 301 is connected to the rear wall of housing 1. This process provides a stable air source for subsequent air flotation operations.

[0048] A gas supply pipe 306 connected to the bottom of the gas tank 302 penetrates the bottom wall of the housing 1, and a nozzle 307 is installed at the top front end of the gas supply pipe 306. When the gas tank 302 stores gas at a certain pressure, the gas is ejected from the nozzle 307 through the gas supply pipe 306, forming a large number of tiny bubbles in the sewage in the housing 1. These bubbles rise rapidly, and during this process, suspended impurities, sludge, and other particulate matter in the sewage adhere to the surface of the bubbles and float to the surface with them, achieving the flotation process and initially separating the impurities from the water.

[0049] The motor 309 is installed inside the protective box 308, which is fixed to the front side wall of the top box 2. After the motor 309 starts, the rotating rod 310 at its output end rotates accordingly, and the rear end of the rotating rod 310 is rotatably connected to the rear side wall inside the top box 2. The first gear 311 on the outer sides of the front and rear ends of the rotating rod 310 rotates synchronously with the rotating rod 310. Since the first gear 311 meshes with the inner side of the rack 312, when the first gear 311 rotates, it drives the rack 312 to perform a horizontal linear motion. At the same time, the front and rear ends of the connecting rod 313 are rotatably connected to the right side inside the top box 2, and the second gear 314 on the outer sides of the connecting rod 313 meshes with the inner right side of the rack 312, further ensuring the stability and accuracy of the rack 312's movement. The connecting ring 315 connected to the outer side of the rack 312 moves synchronously with the rack 312. The connecting block 316 inside the connecting ring 315 drives the support plate 317 to move. The scrapers 318 connected to the bottom of the multiple support plates 317 then reciprocate to scrape the water surface inside the tank 1. The scrapers 318 scrape the impurities and sludge that float to the water surface to a designated location for subsequent centralized cleaning, thus completing the entire process of air flotation impurity removal, effectively improving the purification level of the effluent, and providing better influent conditions for subsequent multi-stage filtration processes.

[0050] After the guide plate 8 guides the sewage into the coarse filtration area, the baffle 7 is equipped with a guide rail groove 13. The second fixed plate 14 is slidably connected by a slider that matches the guide rail groove 13, making the installation and disassembly of the second fixed plate 14 convenient. The coarse filter plate 15 is fixed inside the second fixed plate 14. When the sewage flows through the coarse filter plate 15, larger particles of impurities, such as branches, stones, and large suspended solids, are intercepted by the coarse filter plate 15. These impurities remain on the left side of the coarse filter plate 15 and gradually accumulate over time. The gas sprayed by the air flotation impurity removal mechanism 3 drives these impurities to rise to the top, and the scraper 318 pushes the sludge impurities into the guide plate 8. The guide plate 8 then guides the sludge impurities into the top area inside the partition plate 9.

[0051] The right side of the housing 1 is divided into two functional areas by a partition plate 9 fixed to the right side wall of the baffle 7 and the inside right side of the housing 1. The sludge guided by the guide plate 8 accumulates in the top area of ​​the partition plate 9 for easy cleaning later. At the same time, the sludge entering the top of the partition plate 9 is guided by the first guide plate 10 at the top of the partition plate 9, so that the sludge and impurities flow to the first discharge pipe 11 on the right side and are discharged into the interior of the housing 1 through the first discharge pipe 11.

[0052] When it is necessary to clean the impurities on the coarse filter plate 15, the operator only needs to pull the handle 16 on the front side wall of the second fixed plate 14 to pull the second fixed plate 14 and the coarse filter plate 15 out from the front side of the housing 1, so as to conveniently and quickly clean the intercepted impurities, thereby ensuring that the coarse filter plate 15 continues to have good filtration performance.

[0053] The coarsely filtered wastewater continues to flow to the right, entering the fine filtration stage at the bottom of the partition plate 9. A support ring 17, fixed to the right side of the bottom right side of the baffle plate 7 and the inside right side of the housing 1, supports a fixing ring 18. An outer frame 19 is connected inside the fixing ring 18, and the fine filter plate 20 is fixed inside the outer frame 19. After coarse filtration, the wastewater still contains finer particles, colloids, and some microorganisms, which are further intercepted and filtered as it flows through the fine filter plate 20. During the fine filtration process, impurities gradually accumulate on the surface of the fine filter plate 20, especially in the top area of ​​the rear sidewall of the fine filter plate 20. A second row of debris pipes 21, connected through the rear sidewall of the outer frame 19 and located at the top of the rear sidewall of the fine filter plate 20, serves to promptly discharge the accumulated impurities outside the housing 1. This prevents excessive accumulation of impurities from clogging the fine filter plate 20, ensuring continuous and efficient fine filtration and maintaining a good filtration effect.

[0054] After being purified by coarse and fine filtration, the effluent that meets certain water quality standards continues to flow to the right and enters the collection tank 12, which is fixedly connected to the bottom right side of the tank 1. A second guide plate 22 fixed inside the collection tank 12 guides the incoming effluent, ensuring its even distribution within the tank, reducing flow fluctuations, and helping to stabilize water quality. Finally, the purified effluent is discharged from the device through a drain pipe 23 connected through the front wall of the collection tank 12.

[0055] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claims. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A multi-stage filtration device for effluent from a municipal wastewater treatment plant, comprising a housing (1), characterized in that: A top box (2) is fixedly connected to the top left side of the box (1), and an air flotation impurity removal mechanism (3) is provided on the rear side of the box (1) and inside the top box (2). The air flotation impurity removal mechanism (3) includes: a first fixed plate (301), an air pump (304), a protective box (308), a motor (309), two racks (312), and a connecting rod (313). The front side wall of the first fixed plate (301) is fixedly connected to the rear side wall of the box (1). An air tank (302) is fixedly connected to the rear side wall of the first fixed plate (301). A support plate (303) is fixedly connected to the left side of the rear side wall of the box (1). The air pump (309) is... 4) The bottom wall is fixedly connected to the top of the tray (303). The output end of the air pump (304) is fixedly connected to the delivery pipe (305). The top end of the delivery pipe (305) is connected to the left side wall of the air tank (302). The bottom of the air tank (302) is connected to the air supply pipe (306). The top of the front end of the two air supply pipes (306) is connected to the nozzle (307). The two air supply pipes (306) are connected through the bottom wall of the box (1).

2. The multi-stage filtration device for municipal wastewater treatment plant effluent according to claim 1, characterized in that: The rear side wall of the protective box (308) is fixedly connected to the front side wall of the top box (2), the bottom wall of the motor (309) is fixedly connected to the inner bottom wall of the protective box (308), the output end of the motor (309) is fixedly connected to a rotating rod (310), the rear end of the rotating rod (310) is rotatably connected to the inner rear side wall of the top box (2), and the outer sides of the front and rear ends of the rotating rod (310) are fixedly connected to first gears (311), and the outer sides of the two first gears (311) mesh with the inner left side of the two racks (312).

3. The multi-stage filtration device for municipal wastewater treatment plant effluent according to claim 1, characterized in that: The front and rear ends of the connecting rod (313) are rotatably connected to the inside right side of the top box (2). The outer sides of the front and rear ends of the connecting rod (313) are fixedly connected to the second gear (314). The outer sides of the two second gears (314) mesh with the inside right side of the rack (312). The outer sides of the two racks (312) are fixedly connected to the connecting rings (315). The inner wall groove of each connecting ring (315) is provided with a connecting block (316). The inner side walls of the front and rear connecting blocks (316) are fixedly connected to the support plate (317). The bottom walls of the multiple support plates (317) are fixedly connected to the scraper (318).

4. The multi-stage filtration device for municipal wastewater treatment plant effluent according to claim 1, characterized in that: A feed pipe (4) is connected through the left side wall of the box (1), a control panel (5) is fixedly connected to the front side wall of the box (1), a base (6) is fixedly connected to the bottom left side of the box (1), a baffle (7) is fixedly connected inside the box (1), a guide plate (8) is fixedly connected to the top of the baffle (7), and a water collection tank (12) is fixedly connected to the bottom right side of the box (1).

5. The multi-stage filtration device for municipal wastewater treatment plant effluent according to claim 4, characterized in that: The water collection tank (12) is fixedly connected to the inside of a second guide plate (22), and a drain pipe (23) is connected through the front side wall of the water collection tank (12). A partition plate (9) is fixedly connected to the right side wall of the baffle (7) and the inside right side of the tank body (1). A first guide plate (10) is fixedly connected to the top of the partition plate (9), and a first drain pipe (11) is connected through the right side wall of the tank body (1).

6. The multi-stage filtration device for municipal wastewater treatment plant effluent according to claim 5, characterized in that: The baffle (7) has a guide rail groove (13) inside, and a second fixing plate (14) is slidably connected inside the guide rail groove (13). A coarse filter plate (15) is fixedly connected inside the second fixing plate (14), and the front side of the second fixing plate (14) penetrates the front side of the box body (1).

7. The multi-stage filtration device for municipal wastewater treatment plant effluent according to claim 6, characterized in that: A handle (16) is fixedly connected to the front side wall of the second fixing plate (14). A support ring (17) is fixedly connected to the bottom right side of the baffle (7) and the inside right side of the box (1). A fixing ring (18) is provided on the top of the support ring (17). An outer frame (19) is fixedly connected inside the fixing ring (18).

8. The multi-stage filtration device for municipal wastewater treatment plant effluent according to claim 7, characterized in that: The outer frame (19) is fixedly connected to a fine filter plate (20). A second waste pipe (21) is connected through the rear side wall of the outer frame (19). The rear side of the second waste pipe (21) is connected through the rear side wall of the box (1). The second waste pipe (21) is located at the top of the rear side wall of the fine filter plate (20).

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