Multi-stage filtration sewage treatment device

Abstract

The invention relates to the technical field of multi-stage sewage filtration treatment, and discloses a multi-stage filtration sewage treatment device, which comprises a primary treatment tank, a biological treatment tank, a sedimentation tank and an ultraviolet exposure tank, the front side and the rear side of the bottom wall of the primary treatment tank are sunken based on the U-shaped seat as the center, the front side and the rear side of the bottom of the primary treatment tank are communicated with precipitation cylinders communicated with the sunken part, and protective seats are hermetically arranged on the front side wall and the rear side wall of the inner cavity of the primary treatment tank in a penetrating manner. The multi-stage filtration sewage treatment device realizes uninterrupted discharge of precipitated impurities during sewage treatment, avoids poor impurity separation effect caused by precipitate accumulation in the primary treatment tank, ensures that sewage cannot be discharged along with precipitates, ensures the cleanliness of water subjected to primary treatment, avoids excessive impurities and oil stains, and improves the sewage treatment efficiency. The water purification effect of subsequent treatment is influenced.

Description

Technical Field

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

[0002] Wastewater treatment is the process of purifying wastewater to meet the water quality requirements for discharge into a water body or for reuse. Wastewater treatment is widely used in various fields such as construction, agriculture, transportation, energy, petrochemicals, environmental protection, urban landscaping, medical care, and catering, and is increasingly becoming a part of the daily lives of ordinary people.

[0003] During wastewater treatment, a screw pump discharges wastewater and debris into a screen to isolate and remove large debris. After discharge, the wastewater flows into a grit chamber for sedimentation and removal. After grit treatment, the wastewater enters a wastewater treatment tank for oil separation and removal. After oil treatment, the wastewater is then discharged into a biological treatment tank, a sedimentation tank, and an ultraviolet irradiation tank for further treatment before being discharged. However, during wastewater treatment, a large amount of impurities and sludge will accumulate in the wastewater treatment tank. The sludge cannot be quickly discharged during operation. At the same time, a large portion of the fine impurities and floating oil in the wastewater will be mixed in the wastewater and cannot float to the surface for scraping, resulting in sedimentation and accumulation. The separation effect of impurities and oil is poor, and they are discharged with the water flow to the next treatment process, affecting the water purification effect. Therefore, we propose a multi-stage filtration wastewater treatment device to improve the purification and separation effect of wastewater treatment. Summary of the Invention

[0004] To achieve the above objectives, the present invention provides the following technical solution: a multi-stage filtration wastewater treatment device, comprising 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 with a U-shaped seat in a left-right partition. The bottom wall of the primary treatment tank is concave on both the front and back sides based on the U-shaped seat. The front and back sides of the bottom of the primary treatment tank are connected to sedimentation cylinders that communicate with the concave areas. The front and back side walls of the inner cavity of the primary treatment tank are sealed with protective seats. The number of protective seats is equal to the number of sedimentation cylinders, and they correspond one-to-one vertically. A hydraulic push rod is provided inside the protective seat. A sealing plate concentric with the sedimentation cylinder is provided at the push rod of the hydraulic push rod. The diameter of the sealing plate is equal to the inner diameter of the sedimentation cylinder. A pair of perforations are provided on the sealing plate. An isolation net is provided at the bottom of the sealing plate outside the perforations. A switch control component for controlling the opening and closing of the perforations is provided on the protective seat. A pair of hollow rollers located above the U-shaped seat are rotatably mounted between the left and right side walls of the primary treatment tank. The hollow rollers have multiple water inlet holes on their exterior and filter screens located outside the water inlet holes. An exhaust assembly located inside the U-shaped seat is located at the bottom of the primary treatment tank. U-shaped sludge discharge seats are installed on the left and right sides of the inner wall of the primary treatment tank. A pair of scrapers of equal length that are in contact with the surface of the hollow rollers are located at the lower end of the U-shaped sludge discharge seats. A sludge discharge assembly is located between the hollow rollers and the biological treatment tank. The upper front and rear sides of the U-shaped sewage discharge seat are provided with inclined guide plates. The length of the guide plates is equal to the length between the left and right side walls of the primary treatment tank. The primary treatment tank is provided with a drive assembly, which is provided with a pair of push plates. The push plates drive the floating matter on the inner surface of the primary treatment tank to be discharged into the U-shaped sewage discharge seat along the inclined surface of the guide plates.

[0005] Preferably, the front and rear sides of the upper end of the U-shaped seat and the front and rear sidewalls of the inner cavity of the primary treatment tank are provided with inclined plates that are inclined downwards, and the length of the inclined plates is equal to the length of the inner cavity of the U-shaped seat.

[0006] Preferably, the lower end of the sedimentation cylinder is provided with a drain pipe, and the drain pipe is connected to an automatic switching valve.

[0007] Preferably, the switch control assembly includes a second hydraulic push rod disposed within the protective base, and the push rod of the second hydraulic push rod is provided with a sealing plate located outside the push rod of the first hydraulic push rod, which seals the perforation.

[0008] Preferably, the left side wall of the primary treatment tank is provided with a pair of drive motors that drive the two hollow rollers to rotate.

[0009] Preferably, the exhaust assembly includes multiple exhaust heads that are equidistantly distributed within the U-shaped seat and extend to the bottom of the primary treatment tank. The exhaust heads are uniformly provided with exhaust holes on their exteriors, and an air intake pipe is connected between the lower ends of the exhaust heads. The air intake pipe is connected to the exhaust port of the exhaust fan via a connecting pipe.

[0010] Preferably, the right end of the hollow roller passes through the right side of the primary treatment tank. The sewage discharge assembly includes a rotating seat that is rotatably connected to the outside of the right side of the hollow roller. A bent pipe is connected to the outside of the rotating seat. A straight pipe is connected to the upper end of the bent pipe. An automatic switching valve is connected to the outside of the straight pipe. A water storage seat is connected to the upper end of the straight pipe. A sewage pump is connected to the upper end of the water storage seat. A water pipe is connected between the outlet of the sewage pump and the biological treatment tank. The outlet of the biological treatment tank is connected to the sedimentation tank. The outlet of the sedimentation tank is connected to the ultraviolet exposure tank. The ultraviolet exposure tank is sealed with multiple equally spaced isolation mesh panels, with a filter layer filling the spaces between them.

[0011] Preferably, the drive assembly includes a support base located on the front and rear sides of the upper end of the primary treatment tank. The support base has a pair of guide holes symmetrically distributed front and rear. A dual-axis output motor is located in the middle of the upper end of the support base. The output end of the dual-axis output motor is provided with a threaded rod that rotates with the support base. The threaded rod is externally threaded to a threaded movable seat that passes through the guide holes. The lower end of the threaded movable seat is provided with an elastic telescopic rod. The lower end of the elastic telescopic rod is connected to the push plate. The guide plate is of equal length to the U-shaped drain seat and the push plate, and the front and back are aligned.

[0012] Preferably, the lower end of the U-shaped sewage seat is provided with a pair of elastic telescopic rods that are respectively connected to the scraper.

[0013] Preferably, the lower end of the primary treatment tank is provided with a sludge storage seat located below the sedimentation cylinder, and an L-shaped pipe is fixed through the outer wall of the primary treatment tank and fits against the bottom wall of the inner cavity of the U-shaped sludge discharge seat. The other end of the L-shaped pipe is located above the sludge storage seat.

[0014] Compared with the prior art, the present invention provides a multi-stage filtration wastewater treatment device, which has the following beneficial effects: 1. This multi-stage filtration wastewater treatment device, after the wastewater passes through the screen to separate large-volume impurities and is discharged, enters the primary treatment tank. The U-shaped seat and the concave sides of the primary treatment tank create a static sedimentation zone, facilitating the settling of impurities into the sedimentation cylinder. When it is necessary to discharge the settled impurities, a hydraulic pusher pushes the sealing disc to move downwards against the inner wall of the sedimentation cylinder. The sedimented impurities are isolated by the isolation net, and as the sealing disc moves downwards, it compacts the impurities. Simultaneously, the water squeezed out is discharged through perforations above the sealing disc. After sedimentation and compression are complete, the perforations are closed by a switch control component, allowing the stored settled impurities to be discharged through the sealed sedimentation cylinder. This ensures continuous discharge of settled impurities during wastewater treatment, preventing sediment buildup in the primary treatment tank, which would result in poor impurity separation, and ensuring that wastewater is not discharged along with the sediment.

[0015] 2. This multi-stage filtration wastewater treatment device discharges airflow into the primary treatment tank through the exhaust component, generating bubbles in the wastewater. As the bubbles rise, they carry away fine impurities and oil stains from the wastewater, which float to the surface. Together with the drive component, the push plate scrapes off the floating matter and oil stains on the surface and discharges them into the U-shaped wastewater discharge seat along the guide plate, thus achieving thorough treatment of impurities and oil stains in the wastewater. 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

[0016] Figure 1 This is a perspective view of the present invention; Figure 2 This is a rear view of the present invention; Figure 3 This is a top view of the present invention; Figure 4 This is a perspective view of the primary treatment tank of the present invention; Figure 5 This is a side perspective view of the present invention; Figure 6 This is a cross-sectional perspective view of the primary treatment tank of the present invention; Figure 7 For the present invention Figure 6 The right view; Figure 8 This is a perspective view of the internal structure of the primary treatment tank of the present invention; Figure 9 For the present invention Figure 8 The right view; Figure 10 For the present invention Figure 8 The front view; Figure 11 This is a cross-sectional perspective view of the first and second elastic telescopic rods of the present invention.

[0017] 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

[0018] 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.

[0019] 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.

[0020] 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.

[0021] 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.

[0022] 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.

[0023] 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.

[0024] 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.

[0025] 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.

[0026] 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.

[0027] 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.

[0028] 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.

[0029] 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.

[0030] 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).

[0031] 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.

[0032] 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.

[0033] 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.

[0034] 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.

[0035] 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.

[0036] 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.

[0037] 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 wastewater treatment device, comprising a primary treatment tank, a biological treatment tank, a sedimentation tank, and an ultraviolet irradiation tank, characterized in that: The bottom wall of the primary treatment tank is sealed with a U-shaped seat in a left-right partition. The bottom wall of the primary treatment tank is concave on both the front and back sides based on the U-shaped seat. The front and back sides of the bottom of the primary treatment tank are connected to sedimentation cylinders that communicate with the concave parts. The front and back side walls of the inner cavity of the primary treatment tank are sealed with protective seats. The number of protective seats is equal to the number of sedimentation cylinders, and they correspond one-to-one. A hydraulic push rod is provided in the protective seat. A sealing plate with the same center as the sedimentation cylinder is provided at the push rod of the hydraulic push rod. The diameter of the sealing plate is equal to the inner diameter of the sedimentation cylinder. A pair of perforations are provided on the sealing plate. An isolation net is provided at the bottom of the sealing plate outside the perforations. A switch control component for controlling the opening and closing of the perforations is provided on the protective seat. A pair of hollow rollers located above the U-shaped seat are rotatably mounted between the left and right side walls of the primary treatment tank. The hollow rollers have multiple water inlet holes on their exterior and filter screens located outside the water inlet holes. An exhaust assembly located inside the U-shaped seat is located at the bottom of the primary treatment tank. U-shaped sludge discharge seats are installed on the left and right sides of the inner wall of the primary treatment tank. A pair of scrapers of equal length that are in contact with the surface of the hollow rollers are located at the lower end of the U-shaped sludge discharge seats. A sludge discharge assembly is located between the hollow rollers and the biological treatment tank. The upper front and rear sides of the U-shaped sewage discharge seat are provided with inclined guide plates. The length of the guide plates is equal to the length between the left and right side walls of the primary treatment tank. The primary treatment tank is provided with a drive assembly, which is provided with a pair of push plates. The push plates drive the floating matter on the inner surface of the primary treatment tank to be discharged into the U-shaped sewage discharge seat along the inclined surface of the guide plates.

2. The wastewater treatment device with multi-stage filtration according to claim 1, characterized in that: The front and rear sides of the upper end of the U-shaped seat and the front and rear side walls of the primary treatment tank are all provided with inclined plates that are set downwards. The length of the inclined plates is equal to the length of the inner cavity of the U-shaped seat.

3. The wastewater treatment device with multi-stage filtration according to claim 1, characterized in that: The lower end of the sedimentation cylinder is equipped with a drain pipe, and an automatic switch valve is connected to the outside of the drain pipe.

4. The multi-stage filtration wastewater treatment device according to claim 1, characterized in that: The switch control assembly includes a second hydraulic push rod disposed within the protective base. The push rod of the second hydraulic push rod is provided with a sealing plate located outside the push rod of the first hydraulic push rod, which seals the perforation.

5. The wastewater treatment device with multi-stage filtration according to claim 1, characterized in that: The left side wall of the primary treatment tank is equipped with a pair of drive motors that drive the two hollow rollers to rotate.

6. The wastewater treatment device with multi-stage filtration according to claim 1, characterized in that: The exhaust assembly includes multiple exhaust heads that are evenly distributed within the U-shaped seat and extend to the bottom of the primary treatment tank. The exhaust heads are uniformly provided with exhaust holes on their exteriors. An air intake pipe is connected between the lower ends of the exhaust heads. The air intake pipe is connected to the exhaust port of the exhaust fan via a connecting pipe.

7. The wastewater treatment device with multi-stage filtration according to claim 1, characterized in that: The right end of the hollow roller passes through the right side of the primary treatment tank. The sewage discharge assembly includes a rotating seat that is rotatably connected to the outside of the right side of the hollow roller. A bent pipe is connected to the outside of the rotating seat. A straight pipe is connected to the upper end of the bent pipe. An automatic switching valve is connected to the outside of the straight pipe. A water storage seat is connected to the upper end of the straight pipe. A sewage pump is connected to the upper end of the water storage seat. A water pipe is connected between the outlet of the sewage pump and the biological treatment tank. The outlet of the biological treatment tank is connected to the sedimentation tank. The outlet of the sedimentation tank is connected to the ultraviolet exposure tank. The ultraviolet exposure tank is sealed with multiple equally spaced isolation mesh panels, with a filter layer filling the spaces between them.

8. A multi-stage filtration wastewater treatment device according to claim 1, characterized in that: The drive assembly includes a support base located on the front and rear sides of the upper end of the primary treatment tank. The support base has a pair of guide holes symmetrically distributed front and rear. A dual-axis output motor is located in the middle of the upper end of the support base. The output end of the dual-axis output motor has a threaded rod that rotates with the support base. The threaded rod is threadedly connected to a threaded moving seat that passes through the guide hole. The lower end of the threaded moving seat has an elastic telescopic rod, and the lower end of the elastic telescopic rod is connected to the push plate. The guide plate is of equal length to the U-shaped drain seat and the push plate, and the front and back are aligned.

9. A multi-stage filtration wastewater treatment device according to claim 1, characterized in that: The lower end of the U-shaped sewage discharge seat is provided with a pair of elastic telescopic rods that are respectively connected to the scraper.

10. A multi-stage filtration wastewater treatment device according to claim 1, characterized in that: The lower end of the primary treatment tank is provided with a sludge storage seat located below the sedimentation cylinder. An L-shaped pipe is fixed through the outer wall of the primary treatment tank and fits against the bottom wall of the inner cavity of the U-shaped sludge discharge seat. The other end of the L-shaped pipe is located above the sludge storage seat.

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