A multi-stage filtering sewage treatment device

Abstract

The application relates to the technical field of multi-stage sewage filtering treatment, and discloses a multi-stage filtering sewage treatment device, which comprises a primary treatment tank, a biological treatment tank, a sedimentation tank and an ultraviolet exposure tank; the bottom wall of the primary treatment tank is sealed and installed with a U-shaped seat in the left-right direction; the front and back sides of the bottom wall of the primary treatment tank are concave based on the center of the U-shaped seat; the front and back sides of the bottom of the primary treatment tank are both connected with sedimentation cylinders which are communicated with the concave parts; and the front and back side walls of the inner cavity of the primary treatment tank are both provided with protective seats in a penetrating and sealing mode. The multi-stage filtering sewage treatment device can continuously discharge impurities during sewage treatment, avoids the accumulation of the primary treatment tank, reduces the impurity separation effect, ensures that the sewage is not discharged together with the sediment, guarantees the cleanliness of the water after the primary treatment, avoids excessive impurities and oil stains, and influences the water purification effect of subsequent treatment.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of multi-stage sewage filtration treatment, in particular to a sewage treatment device with multi-stage filtration. BACKGROUND

[0002] Sewage treatment: the process of purifying sewage to meet the water quality requirements for discharge into a certain water body or for reuse, sewage treatment is widely used in construction, agriculture, transportation, energy, petrochemical, environmental protection, urban landscape, medical treatment, catering and other fields, and is increasingly entering the daily life of ordinary people.

[0003] During sewage treatment, the sewage and sundries are discharged into the trash screen through the screw pump, the large-volume sundries in the sewage are isolated and discharged, after the sewage flows into the sand trap, the sand and gravel are deposited and discharged, after the sewage is treated by sand and gravel, the sewage enters the sewage treatment tank, the oil stains are separated and discharged, after the sewage is treated by oil stains, the sewage is sequentially discharged into the biological treatment tank, the sedimentation tank and the ultraviolet exposure tank for deep treatment of the sewage, and then discharged;

[0004] However, during sewage treatment in the sewage treatment tank, a large amount of impurities and sludge will be deposited, which cannot be quickly discharged during work, and most of the fine impurities and floating oil stains in the sewage will mix in the sewage and cannot float to the surface for scraping and treatment, thereby causing deposition and accumulation, poor separation effect of impurities and oil stains, and the phenomenon of being discharged together with the water flow to the next processing procedure, affecting the water purification effect, therefore, the present application provides a sewage treatment device with multi-stage filtration to improve the purification and separation effect of sewage treatment. SUMMARY

[0005] To achieve the above-mentioned purpose, the present application provides the following technical scheme: a sewage treatment device with multi-stage filtration, comprising a primary treatment tank, a biological treatment tank, a sedimentation tank and an ultraviolet exposure tank, a U-shaped seat is sealingly installed on the left and right side walls of the bottom wall of the primary treatment tank, the front and rear sides of the primary treatment tank are concave based on the center of the U-shaped seat, a sedimentation cylinder communicating with the concave portion is communicated with the front and rear sides of the bottom of the primary treatment tank, a protection seat is sealingly provided on the front and rear side walls of the inner cavity of the primary treatment tank, the number of protection seats is equal to the number of sedimentation cylinders one-to-one corresponding to the upper and lower sides, a hydraulic push rod one is arranged in the protection seat, a sealing disc with the same center as the sedimentation cylinder is arranged at the push rod of the hydraulic push rod one, the diameter of the sealing disc is equal to the inner diameter of the sedimentation cylinder, a pair of perforations are arranged on the sealing disc, an isolation net is arranged at the bottom end of the sealing disc outside the perforations, and a switch control assembly for controlling the opening and closing of the perforations is arranged on the protection seat.

[0006] A pair of hollow rollers are rotatably arranged between the left and right side walls of the primary treatment pool, and the outer part of the hollow rollers is provided with a plurality of water inlet holes. The outer part of the hollow rollers is provided with a filter screen outside the water inlet holes. The bottom of the primary treatment pool is provided with an exhaust assembly arranged in the U-shaped seat. The left and right walls of the primary treatment pool are provided with U-shaped pollution discharge seats. The lower end of the U-shaped pollution discharge seat is provided with a pair of scrapers in contact with the surface of the hollow rollers and equal in length. The hollow rollers are provided with a pollution discharge assembly between the biological treatment pool.

[0007] The upper end of the U-shaped pollution discharge seat is provided with guide inclined plates arranged obliquely downward on the front and rear sides. The length of the guide inclined plates is equal to the length between the left and right side walls of the primary treatment pool. The primary treatment pool is provided with a driving assembly. The driving assembly is provided with a pair of push plates. The floating objects on the inner surface of the primary treatment pool are pushed along the inclined surface of the guide inclined plates into the U-shaped pollution discharge seat by the driving push plates.

[0008] Preferably, the front and rear sides of the upper end of the U-shaped seat are provided with inclined plates arranged obliquely downward on the front and rear sides of the primary treatment pool. The length of the inclined plates is equal to the length of the inner cavity of the U-shaped seat.

[0009] Preferably, the lower end of the sedimentation cylinder is provided with a pollution discharge pipe. The outer part of the pollution discharge pipe is connected with an automatic on-off valve II.

[0010] Preferably, the on-off control assembly includes a hydraulic push rod II arranged in the protection seat. The push rod of the hydraulic push rod II is provided with a sealing plate arranged outside the push rod of the hydraulic push rod I and sealing the perforations.

[0011] Preferably, the left side wall of the primary treatment pool is provided with a pair of driving motors for driving the two hollow rollers to rotate, respectively.

[0012] Preferably, the exhaust assembly includes a plurality of exhaust heads arranged in the U-shaped seat and penetrating to the bottom of the primary treatment pool at equal distances. The outer part of the exhaust heads is uniformly provided with exhaust holes. The lower ends of the exhaust heads are connected with an air inlet pipeline. The air inlet pipeline is connected with the exhaust port of an exhaust fan through a connecting pipeline.

[0013] Preferably, the right end of the hollow roller penetrates the right side of the primary treatment pool. The pollution discharge assembly includes a rotating seat rotatably connected to the outer part of the right side of the hollow roller. The outer part of the rotating seat is connected with a bent pipe. The upper end of the bent pipe is connected with a straight pipe. The outer part of the straight pipe is connected with an automatic on-off valve II. The upper end of the straight pipe is connected with a water storage seat. The upper end of the water storage seat is connected with a pollution discharge pump. The water outlet of the pollution discharge pump is connected with a water pipe between the biological treatment pool. The water outlet of the biological treatment pool is connected with the sedimentation pool. The water outlet of the sedimentation pool is connected with the ultraviolet exposure pool.

[0014] The ultraviolet exposure tank is sealed by a plurality of isolation net plates arranged at equal intervals, and the isolation net plates are filled with a filter layer.

[0015] Preferably, the driving assembly comprises support seats arranged on the front and rear sides of the upper end of the primary treatment tank, a pair of front and rear symmetrically distributed guide holes are arranged on the support seats, a double-shaft output motor is arranged at the middle of the upper end of the support seat, a threaded rod rotating with the support seat is arranged at the output end of the double-shaft output motor, a threaded moving seat penetrating through the guide hole is connected to the threaded rod, an elastic telescopic rod I is arranged at the lower end of the threaded moving seat, and the lower end of the elastic telescopic rod I is connected with the push plate.

[0016] Preferably, the guide slope plate is equal in length to the U-shaped pollution discharge seat and the push plate and flush with the front and rear surfaces.

[0017] Preferably, the lower end of the U-shaped pollution discharge seat is provided with a pair of elastic telescopic rods II connected with the scrapers respectively.

[0018] Preferably, the lower end of the primary treatment tank is provided with a pollution storage seat below the sedimentation cylinder, an L-shaped pipeline is fixedly arranged on the outer wall of the primary treatment tank and abuts against the bottom wall of the inner cavity of the U-shaped pollution discharge seat, and the other end of the L-shaped pipeline is arranged above the pollution storage seat.

[0019] Compared with the prior art, the sewage treatment device with multi-stage filtration has the following beneficial effects:

[0020] 1. After the sewage is separated from large-volume impurities by the pollution blocking grid, the sewage enters the primary treatment tank, the two-side concave shapes formed by the U-shaped seat and the primary treatment tank make the concave shapes form static sedimentation zones, the impurities in the sewage are conveniently settled in the sedimentation cylinder, when the settled impurities need to be discharged, the hydraulic push rod I is operated to push the sealing disc to abut against and seal the inner wall of the sedimentation cylinder and move downward, the isolation net separates the settled impurities, the impurities are compacted as the sealing disc moves downward, the water pressed out is discharged above the sealing disc through the perforations, after the sedimentation and extrusion are completed, the perforations are closed by the switch control assembly, the settled impurities in the sedimentation cylinder are discharged, the settled impurities are continuously discharged during the sewage treatment, the impurities in the primary treatment tank are not accumulated, the impurity separation effect is good, and the sewage is not discharged together with the settled impurities.

[0021] 2. The sewage treatment device with multi-stage filtration discharges air into the primary treatment tank through the air discharge assembly, the air bubbles generated in the sewage carry away the fine impurities and oil stains in the sewage and float on the surface, the surface floating objects and oil stains are scraped off by the push plate driven by the driving assembly and are discharged into the U-shaped pollution discharge seat along the guide slope plate, and the impurities and oil stains in the sewage are fully treated.

[0022] In addition, the hollow rollers and filter screens isolate impurities, preventing impurities in the sewage from entering the hollow rollers along with the water inlet. At the same time, the rotation of the hollow rollers and the scraper remove impurities from the surface of the hollow rollers, ensuring water intake and preventing blockage. The isolated water is discharged into the biological treatment tank through the sewage discharge component, ensuring the cleanliness of the water after primary treatment and preventing excessive impurities and oil from affecting the water purification effect of subsequent treatment. Attached Figure Description

[0023] Figure 1 This is a perspective view of the present invention;

[0024] Figure 2 This is a rear view of the present invention;

[0025] Figure 3 This is a top view of the present invention;

[0026] Figure 4 This is a perspective view of the primary treatment tank of the present invention;

[0027] Figure 5 This is a side perspective view of the present invention;

[0028] Figure 6 This is a cross-sectional perspective view of the primary treatment tank of the present invention;

[0029] Figure 7 For the present invention Figure 6 The right view;

[0030] Figure 8 This is a perspective view of the internal structure of the primary treatment tank of the present invention;

[0031] Figure 9 For the present invention Figure 8 The right view;

[0032] Figure 10 For the present invention Figure 8 The front view;

[0033] Figure 11 This is a cross-sectional perspective view of the first and second elastic telescopic rods of the present invention.

[0034] In the diagram: 1. Primary treatment tank; 2. Biological treatment tank; 3. Sedimentation tank; 4. Ultraviolet exposure tank; 5. Isolation mesh plate; 6. U-shaped seat; 7. Inclined plate; 8. Sedimentation cylinder; 9. Automatic on / off valve one; 10. Sludge storage seat; 11. Protective seat; 12. Hydraulic push rod one; 13. Isolation mesh; 14. Hydraulic push rod two; 15. Sealing plate; 16. Hollow roller; 17. Filter screen; 18. Drive motor; 19. Rotating seat; 20. Bending pipe; 21. 21. Straight pipe; 22. Automatic switching valve II; 23. Water storage base; 24. Water pipe; 25. Air inlet pipe; 26. Exhaust head; 27. Exhaust hole; 28. U-shaped sewage discharge seat; 29. ​​Guide plate; 30. Support seat; 31. Guide hole; 32. Dual-shaft output motor; 33. Threaded rod; 34. Threaded moving seat; 35. Elastic telescopic rod I; 36. Push plate; 37. L-shaped pipe; 38. Elastic telescopic rod II; 39. Scraper; 40. Sealing disc. 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.

[0036] Please see Figures 1 to 11 A multi-stage filtration wastewater treatment device includes a primary treatment tank 1, a biological treatment tank 2, a sedimentation tank 3, and an ultraviolet exposure tank 4. The primary treatment tank 1 has a U-shaped seat 6 fixedly and sealed along its bottom wall in a left-right partition. The bottom wall of the primary treatment tank 1 is concave on both the front and back sides, centered on the U-shaped seat 6, and multiple sedimentation cylinders 8 are connected to these concave areas on both the front and back sides. A protective seat 11 is fixedly and sealed through the front and back walls of the inner cavity of the primary treatment tank 1. The protective seat 11 is closed at one end inside the primary treatment tank 1 and at the other end outside the primary treatment tank 1. The protective base 11 is an open, hollow cuboid. A hydraulic push rod 12 is fixed to the bottom wall of the protective base 11 by bolts. A sealing disc 40, which is concentric with the sedimentation cylinder 8, is fixed at the push rod. The diameter of the sealing disc 40 is equal to the inner diameter of the sedimentation cylinder 8. Multiple sealing rings are fitted around the outside of the sealing disc 40 to ensure a tight seal between the sealing disc 40 and the sedimentation cylinder 8 and to prevent water leakage. A pair of through holes are opened on the sealing disc 40. An isolation net 13 located outside the through holes is fixed to the bottom end by screws. The protective base 11 is also equipped with a switch control component to control the opening and closing of the through holes.

[0037] The bottom of the biological treatment tank 2 is equipped with exhaust heads, and an aeration device connected to the exhaust heads is fixed to the outside of the biological treatment tank 2. The tank is filled with biological packing material, which is the prior art. The aeration system is an important component of the biological treatment tank 2. Its main function is to provide oxygen required for the growth of microorganisms in the tank. In this application, the aeration device is a blower aeration device that uses a blower to force air into the bottom of the tank and discharges it through the exhaust heads, forming fine bubbles. As the bubbles rise, they come into full contact with the sewage and transfer oxygen to the microorganisms.

[0038] Biological packing materials: Biological packing materials serve as carriers for microbial attachment and growth. They provide a large specific surface area, allowing microorganisms to adhere extensively to the surface of the packing material and form a biofilm. There are many types of biological packing materials, including soft packing materials, semi-soft packing materials, and combined packing materials. Soft packing materials have advantages such as a large specific surface area and ease of biofilm formation. Semi-soft packing materials are improvements on soft packing materials, possessing both a large specific surface area and a certain degree of rigidity, making them less prone to tangling and resulting in a longer service life. Combined packing materials combine packing materials of different materials and shapes to fully utilize their respective advantages, providing a more suitable growth environment for microorganisms and improving the biological treatment effect.

[0039] A pair of hollow rollers 16 are rotatably mounted on the left and right side walls of the primary treatment tank 1, located above the U-shaped seat 6. Multiple evenly distributed water inlet holes are provided on the outside, and a filter screen 17 located outside the water inlet holes is fixed to the outside by screws. An exhaust assembly is provided at the bottom of the primary treatment tank 1 inside the U-shaped seat 6. A U-shaped sludge discharge seat 28 is installed and fixed on the left and right sides of the inner wall of the primary treatment tank 1. A pair of scrapers 39 of equal length are provided at the lower end of the U-shaped sludge discharge seat 28, which are in contact with the surface of the hollow rollers 16. A sludge discharge assembly is provided between the hollow rollers 16 and the biological treatment tank 2. Inclined guide plates 29 are fixed on the front and rear sides of the upper end of the U-shaped sludge discharge seat 28, with a length equal to the distance between the left and right side walls of the inner cavity of the primary treatment tank 1. A drive assembly is provided on the primary treatment tank 1, and a pair of push plates 36 on it can discharge floating objects on the inner surface of the primary treatment tank 1 into the U-shaped sludge discharge seat 28 along the inclined surface of the guide plates 29.

[0040] Component details and connection relationship: The U-shaped seat 6 and the inclined plate 7 are fixed on the front and rear side surfaces of the upper end of the U-shaped seat 6 and the front and rear side walls of the inner cavity of the primary treatment tank 1. The inclined plate 7 is inclined downward and its length is equal to the inner cavity length of the U-shaped seat 6. Combined with the U-shaped seat 6 and the inner wall of the primary treatment tank 1, the opening is narrowed to form a static sedimentation zone, which facilitates the sedimentation of impurities into the sedimentation cylinder 8.

[0041] The sedimentation cylinder 8 and related components are connected to a drain pipe at its lower end and an automatic switch valve 9 at its external end. The switch control assembly includes a hydraulic push rod 14 fixed to the bottom wall of the inner cavity of the protective seat 11. A sealing plate 15 is fixed at the push rod, located outside the hydraulic push rod 12 and capable of sealing the perforation. A rubber sealing gasket is fixed at the lower end of the sealing plate 15 to ensure the sealing effect of the sealing plate 15. The sealing plate 40 is pushed down by the hydraulic push rod 12, the isolation net 13 isolates the sedimented impurities, the sealing plate 40 compacts the impurities, and the water squeezed out is discharged through the perforation. After the sedimentation and squeezing are completed, the hydraulic push rod 14 pushes the sealing plate 15 down to seal the perforation, opens the automatic switch valve 9, and discharges the sedimented impurities to the sludge storage seat 10.

[0042] The hollow roller 16 and the sewage discharge assembly are provided. A pair of drive motors 18 that drive the hollow roller 16 to rotate are fixed to the left side wall of the primary treatment tank 1 by bolts. The right end of the hollow roller 16 passes through the right side of the primary treatment tank 1. The sewage discharge assembly includes a rotating seat 19 that rotates concentrically and is connected to the outside of the right side of the hollow roller 16. The outside of the rotating seat 19 is connected to a bent pipe 20. The rotating seat 19 is designed to ensure that the bent pipe 20 will not rotate synchronously when the hollow roller 16 rotates. The upper end of the bent pipe 20 is connected to a straight pipe 21, which is connected to an automatic switch valve 22. The upper end of the bent pipe 20 is connected to a water storage seat 23. The upper end of the water storage seat 23 is connected to a sewage pump. The sewage pump's sewage inlet is connected to the water storage seat 23. The sewage pump's sewage outlet is connected to the biological treatment tank 2 through a water pipe 24. The sewage outlet of the biological treatment tank 2 is connected to the sedimentation tank 3 through a sewage discharge pipe. The sewage outlet of the sedimentation tank 3 is connected to the ultraviolet exposure tank 4 through a sewage discharge pipe. Multiple equally spaced isolation mesh plates 5 are installed in the ultraviolet exposure tank 4, with filter layers filling the spaces between them.

[0043] The filter layer can be a variety of existing filter materials such as sand filter layer, activated carbon layer, quartz sand layer, and ceramic granule filter layer. They can be filled separately or stacked, and can be selected according to the actual situation.

[0044] The exhaust assembly includes multiple equidistantly distributed and fixed exhaust heads 26 within the U-shaped base 6, which pass through to the bottom of the primary treatment tank 1. Exhaust holes 27 are evenly opened on the outside, and the lower end is connected to the air inlet pipe 25. The air inlet pipe 25 is connected to the exhaust port of the exhaust fan through the connecting pipe. The airflow enters the exhaust head 26 through the air inlet pipe 25 and is discharged from the exhaust hole 27, generating bubbles in the sewage and carrying fine impurities and oil to float to the liquid surface.

[0045] The drive assembly includes a support base 30 fixed between the front and rear sides of the upper surface of the primary treatment tank 1. The support base 30 has symmetrical guide holes 31. A dual-axis output motor 32 is fixed to the middle of the upper end by bolts. A threaded rod 33 that rotates with the support base 30 is fixed to the output end. The threaded rod 33 is externally threaded to a threaded moving seat 34 that passes through the guide hole 31. An elastic telescopic rod 35 is fixed to the lower end of the threaded moving seat 34. The lower surface of the elastic telescopic rod 35 is connected and fixed to the push plate 36. The dual-axis output motor 32 drives the threaded rod 33 to rotate, causing the threaded moving seat 34 to slide along the guide hole 31, which drives the push plate 36 to move and scrape the liquid surface impurities and oil stains onto the surface of the scraper 39. When the push plate 36 moves up along the slope of the scraper 39, the elastic telescopic rod 35 adaptively retracts, scraping the oil stains into the U-shaped drain seat 28 and then into the sludge storage seat 10 through the L-shaped pipe 37.

[0046] The U-shaped drain seat 28 has related components. A pair of elastic telescopic rods 38 are fixed to the lower surface of the U-shaped drain seat 28 and are connected to the scraper 39 to ensure that the scraper 39 always fits against the hollow roller 16 to scrape off surface impurities. The lower end of the primary treatment tank 1 is fixed below the sedimentation tank 8 and has an L-shaped pipe 37 that is fixed through the outer wall and fits against the bottom wall of the inner cavity of the U-shaped drain seat 28. Its opening is located above the sludge storage seat 10 and is used to discharge impurities and oil from the U-shaped drain seat 28.

[0047] It should be added that both the elastic telescopic rod 1 (35) and the elastic telescopic rod 2 (38) are composed of a hollow outer slide cylinder, a stainless steel spring, and a movable inner rod. The hollow outer slide cylinder and the movable inner rod are slidably connected and cannot be separated. The stainless steel spring is fixed between the hollow outer slide cylinder and the movable inner rod, thereby realizing the elastic telescopic function of the elastic telescopic rod 1 (35) and the elastic telescopic rod 2 (38).

[0048] Primary treatment tank 1, biological treatment tank 2, sedimentation tank 3 and ultraviolet exposure tank 4 can be made of reinforced concrete or corrosion-resistant high-strength plastic material, which has good strength and durability and can withstand water pressure and chemical corrosion during sewage treatment.

[0049] The isolation mesh 13, filter mesh 17, and isolation mesh plate 5 can be existing filter mesh structures such as stainless steel filter mesh, microporous filter mesh, and activated carbon fiber filter, and can be selected according to the actual situation.

[0050] Working principle and usage steps: In the initial wastewater treatment stage, the collected wastewater passes through a screen to separate large-volume impurities and then enters the primary treatment tank 1. The U-shaped seat 6 and the secondary treatment tank 1 form two concave sections, which, combined with the inclined plate 7, the U-shaped seat 6, and the inner wall of the primary treatment tank 1, narrow the opening, creating a static sedimentation zone. This allows impurities in the wastewater to settle into the sedimentation cylinder 8. When it is necessary to discharge the settled impurities, the hydraulic push rod 12 pushes the sealing disc 40 to conform to the inner wall of the sealing sedimentation cylinder 8 and move downwards. The isolation net 13 then isolates the settled impurities. As the sealing disc 40 moves downward, it compacts the impurities. At the same time, the water that is squeezed out is discharged through the perforation to the top of the sealing disc 40. After the sedimentation and squeezing are completed, the sealing plate 15 is pushed down by the hydraulic push rod 14 to seal the perforation. Then, by opening the automatic switch valve 9, the sealed sedimentation cylinder 8 discharges the stored sediment from the drain pipe into the sludge storage seat 10. This achieves uninterrupted discharge of sediment during sewage treatment, avoiding the accumulation of sediment in the primary treatment tank that cannot be treated, resulting in poor impurity separation. At the same time, it ensures that sewage is not discharged with the sediment when it is discharged.

[0051] In the stage of impurity and oil treatment, the exhaust fan sends air to the air inlet pipe 25 through the connecting pipe. The airflow enters the exhaust head 26 and is discharged from the exhaust hole 27, generating bubbles in the sewage. As the bubbles rise, they carry the fine impurities and oil in the sewage to the surface. The dual-shaft output motor 32 drives the threaded rod 33 to rotate, causing the threaded moving seat 34 to slide along the guide hole 31, which in turn drives the push plate 36 to move, scraping the impurities and oil on the surface of the liquid onto the surface of the scraper 39. As the push plate 36 moves up the slope of the scraper 39, the elastic telescopic rod 35 retracts adaptively, scraping the oil into the U-shaped sewage seat 28 and then into the sewage storage seat 10 through the L-shaped pipe 37.

[0052] In the wastewater filtration and subsequent treatment stage, the drive motor 18 drives the hollow roller 16 to rotate, and the filter screen 17 isolates impurities, preventing impurities in the wastewater from entering the hollow roller 16 through the water inlet. At the same time, the elastic telescopic rod 38 ensures that the scraper 39 is always in contact with the hollow roller 16, scraping off surface impurities, ensuring smooth water intake and avoiding blockage. The filtered wastewater passes through the hollow roller 16, rotating seat 19, bent pipe 20, straight pipe 21, automatic switch valve 22, water storage seat 23, sludge pump, and water pipe 24 and is sequentially discharged into the biological treatment tank 2, sedimentation tank 3, and ultraviolet exposure tank 4 for deep purification before being discharged. When it is necessary to clean the filter screen 17, the sludge pump stops working, and the return water is stored in the water storage seat 23. After storage, the automatic switch valve 22 is opened, and the return water is discharged back into the hollow roller 16 to flush and clean the filter screen 17, preventing filter screen blockage and ensuring the isolation of impurities and drainage effect.

[0053] The multi-stage filtration wastewater treatment device in this embodiment effectively solves the problems of difficult discharge of impurities and poor separation effect in the existing wastewater treatment process through its unique structural design and multi-stage treatment process, thereby improving the purification and separation effect of wastewater treatment and showing good application prospects.

[0054] 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 multi-stage filtration sewage treatment apparatus comprising a primary treatment tank, a biological treatment tank, a sedimentation tank, and an ultraviolet light exposure tank, characterized by: The bottom wall of the primary treatment tank is sealed and installed with a U-shaped seat left and right, the bottom wall of the primary treatment tank is concave based on the U-shaped seat center front and back, the front and back of the primary treatment tank bottom are both communicated with the sedimentation cylinder communicated with the concave part, the front and back walls of the primary treatment tank cavity are both sealed and provided with a protection seat, the protection seat is equal in number to the sedimentation cylinder and corresponds one by one, a hydraulic push rod one is arranged in the protection seat, a sealing disc with the same center as the sedimentation cylinder is arranged at the push rod of the hydraulic push rod one, the diameter of the sealing disc is equal to the inner diameter of the sedimentation cylinder, a pair of perforations are arranged on the sealing disc, an isolation net is arranged at the bottom end of the sealing disc outside the perforations, a switch control assembly is arranged on the protection seat to control the opening and closing of the perforations; A pair of hollow rollers above the U-shaped seat are rotatably arranged between the left and right side walls of the primary treatment tank, a plurality of water inlet holes are arranged on the outer part of the hollow roller, a filter screen is arranged on the outer part of the hollow roller outside the water inlet holes, an exhaust assembly is arranged in the U-shaped seat at the bottom of the primary treatment tank, a U-shaped pollution discharge seat is installed left and right on the inner wall of the primary treatment tank, a pair of scrapers with the same length as the surface of the hollow roller are arranged at the lower end of the U-shaped pollution discharge seat, and a pollution discharge assembly is arranged between the hollow roller and the biological treatment tank; The upper end of the U-shaped pollution discharge seat is provided with inclined guide plates arranged downward on the front and back sides, the length of the guide plates is equal to the length between the left and right side walls of the primary treatment tank cavity, a driving assembly is arranged on the primary treatment tank, a pair of push plates are arranged on the driving assembly, and the floating matter on the inner surface of the primary treatment tank is driven by the push plates to be discharged into the U-shaped pollution discharge seat along the inclined surface of the guide plates.

2. A multi-stage filtered sewage treatment apparatus as claimed in claim 1, wherein: The front and back sides of the upper end of the U-shaped seat and the front and back walls of the primary treatment tank cavity are both provided with inclined guide plates arranged downward, and the length of the guide plates is equal to the length of the cavity of the U-shaped seat.

3. A multi-stage filtered sewage treatment apparatus as claimed in claim 1, wherein: The lower end of the sedimentation cylinder is provided with a pollution discharge pipe, and the outer part of the pollution discharge pipe is communicated with an automatic on-off valve one.

4. A multi-stage filtered sewage treatment device as claimed in claim 1, wherein: The switch control assembly comprises a hydraulic push rod two arranged in the protection seat, and a sealing plate is arranged at the push rod of the hydraulic push rod two outside the push rod of the hydraulic push rod one to seal the perforations.

5. A multi-stage filtered sewage treatment apparatus as claimed in claim 1, wherein: A pair of driving motors are arranged on the left side wall of the primary treatment tank to drive the rotation of the two hollow rollers respectively.

6. A multi-stage filtered sewage treatment apparatus as claimed in claim 1, wherein: The exhaust assembly comprises a plurality of exhaust heads arranged in the U-shaped seat at equal distances and penetrating to the bottom of the primary treatment tank, the outer part of the exhaust head is uniformly provided with exhaust holes, the lower end of the exhaust head is communicated with an air inlet pipeline, and the air inlet pipeline is connected to the exhaust port of the exhaust fan through a connecting pipeline.

7. A multi-stage filtered sewage treatment apparatus as claimed in claim 1, wherein: The right end of the hollow roller penetrates the right side of the primary treatment tank, the pollution discharge assembly comprises a rotating seat rotatably connected to the outer part of the right side of the hollow roller, the outer part of the rotating seat is communicated with a bent pipe, the upper end of the bent pipe is communicated with a straight pipe, the outer part of the straight pipe is communicated with an automatic on-off valve two, the upper end of the straight pipe is communicated with a water storage seat, the upper end of the water storage seat is communicated with a sewage pump, the water outlet of the sewage pump is communicated with the biological treatment tank, the water outlet of the biological treatment tank is communicated with the sedimentation tank, and the water outlet of the sedimentation tank is communicated with the ultraviolet exposure tank. The ultraviolet exposure tank is sealed by a plurality of isolation net plates arranged at equal intervals, and the isolation net plates are filled with a filter layer.

8. A multi-stage filtered sewage treatment apparatus as claimed in claim 1, wherein: The driving assembly comprises support seats arranged on the front and back sides of the upper end of the primary treatment tank, a pair of front and back symmetrically distributed guide holes are arranged on the support seats, a double-shaft output motor is arranged at the middle part of the upper end of the support seat, a threaded rod that rotates with the support seat is arranged at the output end of the double-shaft output motor, a threaded moving seat that penetrates through the guide hole is connected to the outer thread of the threaded rod, an elastic telescopic rod I is arranged at the lower end of the threaded moving seat, and the lower end of the elastic telescopic rod I is connected with the push plate. The material guiding inclined plate is equal in length to the U-shaped pollution discharging seat and the push plate and flush with the front and back surfaces.

9. A multi-stage filtered sewage treatment apparatus as claimed in claim 1, wherein: A pair of elastic telescopic rods II that are connected with the scraper are arranged at the lower end of the U-shaped pollution discharging seat.

10. A multi-stage filtered sewage treatment apparatus as claimed in claim 1, wherein: The lower end of the primary treatment tank is provided with a pollution storage seat below the sedimentation cylinder, an L-shaped pipeline that is attached to the bottom wall of the inner cavity of the U-shaped pollution discharging seat is fixed through the outer wall of the primary treatment tank, and the other end opening of the L-shaped pipeline is located above the pollution storage seat.

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