Multi-stage filtering device for sewage treatment

Abstract

The utility model relates to a multistage filtering device for sewage treatment. Comprising a roller filtering assembly for filtering floating objects and a filter cloth filtering assembly for filtering suspended particles, the roller filtering assembly comprises a front filtering box, the rear wall of the front filtering box is provided with a sewage inlet, the bottom of the front filtering box is provided with a water outlet pipe, a filtering roller is installed in the front filtering box, a driving motor is installed on the side portion of the front filtering box, a scraping plate is installed on the front portion of the front filtering box, and the top edge of the scraping plate abuts against the front portion of the filtering roller; the filter cloth filtering assembly comprises a rear filtering box, and multiple stages of filter cloth assemblies are arranged in the rear filtering box. According to the utility model, the floating objects and the suspended particulate matters are subjected to differential filtration, so that the floating objects and the particulate matters intercepted by filtration can be quickly discharged and taken out by the system, and the filtration energy efficiency is kept for a long time.

Description

Technical Field

[0001] The utility model belongs to the technical field of sewage treatment facilities, and in particular relates to a multi-stage filtering device for sewage treatment. Background Art

[0002] Filtering wastewater to remove bulk floating debris and large and small suspended solids is a crucial step in wastewater treatment. By removing floating debris and particulate matter, the wastewater becomes clarified for further treatment. Given the different characteristics of large floating debris and suspended particulate matter in the water, different filtration treatments should be employed to achieve optimal filtration results. Furthermore, retained floating debris and particulate matter should be quickly discharged or removed from the system to avoid prolonged accumulation and the resulting loss of filtration efficiency. This ensures continuous filtration capacity and forms a continuous filtration process.

[0003] Existing sewage filtration devices are difficult to meet the above requirements and need to be developed and designed specifically. Utility Model Content

[0004] The purpose of the utility model is to provide a multi-stage filtration device for sewage treatment, which can perform differential filtration on floating objects and suspended particles, so that the floating objects and particles trapped by the filtration can be quickly discharged and removed from the system, and the filtration efficiency can be maintained for a long time.

[0005] The technical solution adopted by the utility model is: a multi-stage filtering device for sewage treatment, including a drum filter assembly for filtering floating objects and a filter cloth filter assembly for filtering suspended particles; the drum filter assembly includes a pre-filter box with a sewage inlet on the rear wall and a water outlet pipe on the bottom, a filter drum is installed inside the pre-filter box, a drive motor is installed on the side of the pre-filter box, a scraper is installed at the front of the pre-filter box, and the top edge of the scraper is abutted against the front of the filter drum; the filter cloth filter assembly includes a post-filter box, and a multi-stage filter cloth assembly is provided inside the post-filter box; it also includes a sewage cache tank, the outlet pipe is docked with the inlet provided on the sewage cache tank, a sewage transfer assembly is provided between the sewage cache tank and the top of the post-filter box, and a reflux assembly is provided between the bottom outlet of the post-filter box and the reflux port of the sewage cache tank.

[0006] Preferably, a waste discharge hopper is installed below the front of the pre-filter box, and floating objects peeled off by the scraper on the surface of the filter drum fall downward into the interior of the waste discharge hopper.

[0007] Preferably, the top front of the pre-filter box is open and an openable and closable box cover is installed on the opening.

[0008] Preferably, a cleaning water inlet is provided on the left side wall of the pre-filter box, and a cleaning water outlet is provided on the right side wall of the pre-filter box.

[0009] Preferably, the multi-stage filter cloth assembly includes a bottom frame, a top frame and a middle frame located therebetween and interlocked with each other step by step. Filter cloths are sandwiched between adjacent frames, and the filter holes of each stage of filter cloth gradually decrease from top to bottom.

[0010] Preferably, a receiving box is installed on the top of the post-filter box using an adapter, and an energy dissipation orifice plate is installed at the bottom of the receiving box. The sewage transfer component sprays the sewage onto the energy dissipation orifice plate, and the sewage falls on the uppermost filter cloth after passing through the energy dissipation orifice plate.

[0011] Preferably, the post-filter box is mounted on a base, vibration-damping springs are provided below the four corners of the base, and a vibration motor is also installed in the middle of the bottom of the base.

[0012] Preferably, the sewage transfer component includes a booster pump, whose inlet is connected to the bottom outlet of the sewage buffer tank, a water supply pipe with a turbidity meter is installed on the outlet of the booster pump, a multi-branch nozzle is installed at the end of the water supply pipe and a nozzle is installed at the lower end of each nozzle; the return component includes a return pump, whose inlet is connected to the bottom outlet of the post-filter box through a suction pipe, and the outlet of the return pump is connected to the return port of the sewage buffer tank through a return pipe.

[0013] Preferably, it also includes a lifting assembly, which includes a lifting pump. A lifting pipe is installed on the inlet of the lifting pump, and the lower end of the lifting pipe extends to the bottom of the inner cavity of the sewage buffer tank. A drain pipe is installed on the outlet of the lifting pump.

[0014] Preferably, a stirring assembly is also installed in the sewage buffer tank, and the stirring assembly includes a stirring drive motor and a stirring shaft and a stirring impeller installed at the lower end of the output shaft thereof.

[0015] The advantages and positive effects of the utility model are:

[0016] The utility model provides a multi-stage filtering device for sewage treatment. Compared with the existing sewage filtering device, the multi-stage filtering device in the utility model adopts a front drum filter component to filter floating objects in the sewage, and adopts a rear filter cloth filter component to filter suspended particles in the sewage, thereby achieving the technical effect of differential filtration of floating objects and suspended particles, and improving the filtering and treatment capacity of sewage.

[0017] By equipping the filter drum of the drum filter assembly with a scraper, floating matter trapped by the filter drum is continuously stripped off by the scraper and discharged to the exterior of the pre-filter box. The multi-stage filter cloth assembly of the filter cloth filter assembly can be extracted from the post-filter box to process the particulate matter trapped by each stage of the filter cloth. Therefore, this multi-stage filtration device can quickly discharge and remove trapped floating matter and particulate matter from the system, maintaining long-term filtration efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a schematic diagram of the main structure of the utility model;

[0019] Figure 2 yes Figure 1 Schematic diagram of the three-dimensional structure of the middle drum filter assembly, from the upper perspective;

[0020] Figure 3 yes Figure 1 Schematic diagram of the cross-sectional structure of the filter cloth filter assembly.

[0021] In the picture:

[0022] 1. Support platform; 2. Bracket; 3. Waste hopper; 4. Cleaning water inlet; 5. Drive motor; 6. Pre-filter box; 7. Box cover; 8. Filter drum; 9. Scraper; 10. Cleaning water outlet; 11. Outlet pipe; 12. Sewage buffer tank; 13. Lifting pipe; 14. Lifting pump; 15. Drain pipe; 16. Booster pump; 17. Water supply pipe; 18. Return pipe; 19. Return pump; 20. Suction pipe; 21. Post-filter box; 22. Energy dissipation orifice plate; 23. Nozzle; 24. Turbidity meter; 25. Multi-branch nozzle; 26. Receiving box; 27. Adapter; 28. Multi-stage filter cloth assembly; 28-1. Bottom frame; 28-2. Middle frame; 28-3. Filter cloth; 28-4. Top frame; 29. ​​Base; 30. Vibration damping spring; 31. Vibration motor; 32. Sewage inlet. DETAILED DESCRIPTION

[0023] In order to further understand the content, features and effects of the present invention, the following embodiments are given to illustrate in detail.

[0024] See Figure 1 The utility model discloses a multi-stage filtration device for sewage treatment, comprising a drum filter assembly for filtering floating objects and a cloth filter assembly for filtering suspended particles. The drum filter assembly is used to filter and retain large floating objects in the sewage, while the cloth filter assembly uses multiple layers of filter cloth to further filter the sewage and retain suspended particles.

[0025] See Figure 2 , we can see that:

[0026] The drum filter assembly includes a pre-filter box 6 with a sewage inlet 32 ​​on the rear wall and a water outlet pipe 11 at the bottom. A filter drum 8 is installed inside the pre-filter box 6, a drive motor 5 is installed on the side of the pre-filter box 6, and a scraper 9 is installed at the front of the pre-filter box 6. The top edge of the scraper 9 is in contact with the front of the filter drum 8.

[0027] Sewage inlet 32 ​​is connected to the sewage supply pipeline. Sewage mixed with floating debris and suspended particulate matter enters the interior of the pre-filter box 6 through sewage inlet 32. The sewage is ejected to the rear of the filter drum 8. Bulk floating debris is filtered and trapped on the surface of the filter drum 8. The sewage then flows downward after passing through the filter drum 8 and is discharged through the outlet pipe 11. Driven by the drive motor 5, the filter drum 8 rotates steadily and slowly. Bulk floating debris trapped on the surface of the filter drum 8 rolls forward with the filter drum 8. When it reaches the scraper 9, it is peeled off by the scraper 9 and discharged along the inclined surface of the scraper 9 to the outside of the pre-filter box 6.

[0028] In this embodiment, a waste hopper 3 is installed at the front lower part of the pre-filter box 6. The floating objects peeled off by the scraper 9 on the surface of the filter drum 8 fall into the interior of the waste hopper 3, and then slide downward along the waste hopper 3 to be discharged. A collection basket can be set at the bottom of the waste hopper 3 to collect the bulk floating objects.

[0029] In this embodiment, the top front of the pre-filter box 6 is open and a box cover 7 that can be opened and closed is installed on the opening. During operation, the box cover 7 is closed to enclose the filter drum 8 inside to prevent sewage from splashing to the outside. When the inside of the pre-filter box 6 needs to be cleaned, the box cover 7 is opened.

[0030] In this embodiment, a cleaning water inlet 4 is provided on the left side wall of the pre-filter box 6, and a cleaning water outlet 10 is provided on the right side wall of the pre-filter box 6. When the interior needs to be cleaned, the cleaning water source pipeline can be connected to the cleaning water inlet 4, and the high-pressure flushing water source can be introduced into the interior of the pre-filter box 6. The waste water after cleaning is discharged through the cleaning water outlet 10. When cleaning is not performed, a sealing plate can be installed on the cleaning water inlet 4 and the cleaning water outlet 10.

[0031] like Figure 2 As shown in , the drum filter assembly further includes a support platform 1 and a bracket 2 is installed on the support platform 1 , and the pre-filter box 6 is installed and fixed on the top of the bracket 2 .

[0032] See Figure 1 , we can see that:

[0033] The filter cloth filter assembly includes a post-filter box 21, inside which a multi-stage filter cloth assembly 28 is provided. Sewage enters the box from the top of the post-filter box 21 and falls on the multi-stage filter cloth assembly 28. The sewage passes through the multi-stage filter cloth from top to bottom, and the suspended particles in the sewage are filtered and intercepted by the filter cloth at each level.

[0034] See Figure 3 It can be seen that the multi-stage filter cloth assembly 28 includes a bottom frame 28-1, a top frame 28-4 and a middle frame 28-2 located between the two and connected step by step. Filter cloth 28-3 is clamped between adjacent frames, and the filter holes of the filter cloth 28-3 at each level gradually decrease from top to bottom.

[0035] As shown in the figure, a conical boss is provided on the inner side of the top of the bottom frame 28-1, a conical necking is provided on the outer side of the bottom of the middle frame 28-2 and a conical boss is provided on the inner side of the top, a conical necking is provided on the outer side of the bottom of the top frame 28-4, and the top of the top frame 28-4 is open, so that the conical necking at the bottom of the previous frame can be embedded in the top interior of the next frame and abut against the conical boss, and the edge of the filter cloth 28-3 is clamped between the conical necking and the conical boss, so that the filter cloth 28-3 can maintain a reasonable extension state. When the filter cloth 28-3 needs to be cleaned or replaced, it is only necessary to disassemble the frames of each level of the multi-stage filter cloth assembly 28, clean or replace the filter cloth 28-3, and then stack the frames of each level of the multi-stage filter cloth assembly 28 again.

[0036] In this embodiment, a receiving box 26 is mounted on top of the post-filter box 21 using an adapter 27. An energy-dissipating orifice plate 22 is installed at the bottom of the receiving box 26. Sewage is sprayed onto the energy-dissipating orifice plate 22, passing through it and landing on the topmost filter cloth 28-3. The energy-dissipating orifice plate 22 serves two functions: one is to dissipate energy from the sewage, preventing it from directly impacting the topmost filter cloth 28-3; the other is to provide a certain degree of filtration, intercepting particles larger than the aperture of the energy-dissipating orifice plate 22.

[0037] The adapter 27 is detachably connected to the post-filter box 21, so that the receiving box 26 and its energy dissipation orifice plate 22 can be conveniently disassembled and assembled on the top of the post-filter box 21. When the receiving box 26 and its energy dissipation orifice plate 22 are disassembled, the multi-stage filter cloth assembly 28 can be taken out of the box to clean or replace the aforementioned filter cloth 28-3.

[0038] In this embodiment, the post-filter box 21 is mounted on a base 29. Damping springs 30 are located below the four corners of the base 29, and a vibration motor 31 is mounted in the center of the bottom of the base 29. The vibration motor 31 vibrates the post-filter box 21 and its multi-stage filter cloth assembly 28 above it, promoting the downward flow of sewage through the various filter cloths 28-3 and the filtration and retention of particulate matter.

[0039] The system also includes a sewage buffer tank 12, with an outlet pipe 11 dockingly connected to an inlet provided on the sewage buffer tank 12. A sewage transfer assembly is provided between the sewage buffer tank 12 and the top of the post-filter box 21, and a return assembly is provided between the bottom outlet of the post-filter box 21 and the return port of the sewage buffer tank 12. Sewage discharged from the drum filter assembly enters the sewage buffer tank 12 via the outlet pipe 11. The sewage transfer assembly transfers the sewage to the filter cloth filter assembly. The sewage filtered and treated by the filter cloth filter assembly then flows back to the sewage buffer tank 12 under the action of the return assembly, thus establishing a filtration cycle. Through the filtration cycle that lasts for a certain period of time, suspended particulate matter is fully filtered and retained.

[0040] The sewage transfer assembly includes a booster pump 16, the inlet of which is connected to the bottom outlet of the sewage buffer tank 12. A water supply pipe 17 with a turbidity meter 24 is installed on the outlet of the booster pump 16. A plurality of branch nozzles 25 are installed at the end of the water supply pipe 17, and a nozzle 23 is installed at the lower end of each nozzle. Each nozzle 23 is located above the energy dissipation orifice 22. The booster pump 16 extracts the sewage from the sewage buffer tank 12, and delivers it to the branch nozzle 25 in a pressurized manner through the water supply pipe 17, and finally sprays it downward from each nozzle 23. The purpose of setting the turbidity meter 24 is to perform online turbidity detection on the sewage flowing through the water supply pipe 17. When the turbidity drops to the set value, it means that the suspended particulate matter in the sewage has been fully filtered, and the aforementioned filtration cycle can be stopped.

[0041] The reflux assembly includes a reflux pump 19, whose inlet is connected to the bottom outlet of the post-filter box 21 via a suction pipe 20. The outlet of the reflux pump 19 is connected to the reflux port of the sewage buffer tank 12 via a reflux pipe 18. Considering that the post-filter box 21 is installed on the vibration assembly, the suction pipe 20 can be a rubber tube lined with a ribbed mesh.

[0042] This embodiment also includes a lifting assembly, which includes a lifting pump 14. A lifting pipe 13 is installed at the inlet of the lifting pump 14, and the lower end of the lifting pipe 13 extends to the bottom of the inner cavity of the sewage buffer tank 12. A drain pipe 15 is installed at the outlet of the lifting pump 14. The lifting assembly is used to transfer the sewage in the sewage buffer tank 12 to a subsequent sewage treatment facility.

[0043] In this embodiment, a stirring assembly is also installed in the sewage buffer tank 12. The stirring assembly includes a stirring drive, a stirring shaft mounted at the lower end of the stirring drive output shaft, and a stirring impeller. The stirring assembly is provided to prevent the sedimentation of suspended particles in the sewage buffer tank 12, keeping the particles suspended and allowing them to enter the filtration cycle for removal.

Claims

1. A multi-stage filtration device for sewage treatment, characterized by: The invention comprises a drum filter assembly for filtering floating objects and a filter cloth filter assembly for filtering suspended particles; the drum filter assembly comprises a front filter box (6) with a sewage inlet (32) on the rear wall and a water outlet pipe (11) on the bottom, a filter drum (8) is installed inside the front filter box (6), a drive motor is installed on the side of the front filter box (6), a scraper (9) is installed at the front of the front filter box (6), and the top edge of the scraper (9) abuts against the front of the filter drum (8); the filter cloth filter assembly comprises a rear filter box (21), a multi-stage filter cloth assembly (28) is provided inside the rear filter box (21); and the invention also comprises a sewage buffer tank (12), the water outlet pipe (11) is docked with an inlet provided on the sewage buffer tank (12), a sewage transfer assembly is provided between the sewage buffer tank (12) and the top of the rear filter box (21), and a reflux assembly is provided between the bottom outlet of the rear filter box (21) and the reflux port of the sewage buffer tank (12).

2. The multi-stage filtration device for sewage treatment according to claim 1, characterized in that: A waste discharge hopper (3) is installed below the front of the pre-filter box (6), and floating objects peeled off from the surface of the filter drum (8) by the scraper (9) fall downward into the interior of the waste discharge hopper (3).

3. The multi-stage filtration device for sewage treatment according to claim 2, characterized in that: The top front of the pre-filter box (6) is open and a box cover (7) that can be opened and closed is installed on the opening.

4. The multi-stage filtration device for sewage treatment according to claim 3, wherein: A cleaning water inlet (4) is provided on the left side wall of the pre-filter box (6), and a cleaning water outlet (10) is provided on the right side wall of the pre-filter box (6).

5. The multi-stage filtration device for sewage treatment according to claim 1, wherein: The multi-stage filter cloth assembly (28) comprises a bottom frame (28-1), a top frame (28-4), and a middle frame (28-2) located between the bottom frame and connected in a step-by-step manner. Filter cloths (28-3) are sandwiched between adjacent frames, and the filter holes of the filter cloths (28-3) of each stage gradually decrease from top to bottom.

6. The multi-stage filtration device for sewage treatment as claimed in claim 5, characterized in that: A receiving box (26) is installed on the top of the post-filter box (21) using a transfer seat (27). An energy dissipation orifice plate (22) is installed at the bottom of the receiving box (26). The sewage transfer component sprays sewage onto the energy dissipation orifice plate (22). The sewage passes through the energy dissipation orifice plate (22) and falls on the uppermost filter cloth (28-3).

7. The multi-stage filtration device for sewage treatment according to claim 6, characterized in that: The post-filter box (21) is mounted on a base (29). Vibration-damping springs (30) are provided below the four corners of the base (29). A vibration motor (31) is also installed in the middle of the bottom of the base (29).

8. The multi-stage filtration device for sewage treatment according to any one of claims 1 to 7, characterized in that: The sewage transfer component includes a booster pump (16), the inlet of which is connected to the bottom outlet of the sewage buffer tank (12), a water supply pipe (17) with a turbidity meter (24) is installed on the outlet of the booster pump (16), a multi-branch nozzle (25) is installed at the end of the water supply pipe (17), and a nozzle (23) is installed at the lower end of each nozzle; the return component includes a return pump (19), the inlet of which is connected to the bottom outlet of the post-filter box (21) through a water pumping pipe (20), and the outlet of the return pump (19) is connected to the return port of the sewage buffer tank (12) through a return pipe (18).

9. The multi-stage filtration device for sewage treatment according to any one of claims 1 to 7, characterized in that: The utility model also includes a lifting assembly, which includes a lifting pump (14), a lifting pipe (13) is installed on the inlet of the lifting pump (14), and the lower end of the lifting pipe (13) extends to the bottom of the inner cavity of the sewage buffer tank (12), and a drainage pipe (15) is installed on the outlet of the lifting pump (14).

10. The multi-stage filtration device for sewage treatment according to any one of claims 1 to 7, characterized in that: A stirring assembly is also installed in the sewage buffer tank (12), and the stirring assembly includes a stirring driving machine, a stirring shaft and a stirring impeller installed at the lower end of the output shaft of the stirring driving machine.

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