An integrated two-stage filtering device for laboratory sewage pretreatment

Abstract

The application relates to the technical field of laboratory sewage treatment, in particular to an integrated two-stage filtering device for laboratory sewage pretreatment, which comprises an outer cylinder, a primary filtering assembly, a secondary filtering assembly and a quick-release sealing cover; the primary filtering assembly is arranged below the quick-release sealing cover and comprises a coarse filter cover and a rotary scraping piece; the secondary filtering assembly is arranged at the lower part of the inner cavity of the outer cylinder and comprises a porous ceramic fine filter cartridge, a filter core seat and a flow guide cone; an activated carbon and quartz sand mixed filter medium layer is arranged at the middle part of the inner wall of the outer cylinder, and a transparent observation window is arranged on the side wall of the outer cylinder. The application can realize the staged filtering of large particles and small suspended matters in sewage and facilitates quick dismounting and cleaning.

Description

Technical Field

[0001] This utility model relates to the field of wastewater treatment technology, and in particular to an integrated two-stage filtration device for laboratory wastewater pretreatment. Background Technology

[0002] The core purpose of wastewater treatment sampling is to obtain representative water quality data, providing a scientific basis and decision-making foundation for the operation and management, process optimization, compliant discharge, and risk prevention of the entire wastewater treatment system. Sampling is the "eyes" of the wastewater treatment plant. Through continuous or periodic sampling and analysis of the influent, each process unit (such as biological treatment tanks and secondary sedimentation tanks), and internal recirculation, operators can monitor the changing trends of key indicators (such as COD, ammonia nitrogen, pH, and sludge concentration) in real time. This helps to accurately assess the treatment efficiency of each unit, adjust operating parameters such as aeration rate, sludge recirculation rate, and reagent dosage in a timely manner, and ensure that the biochemical reaction is in optimal condition, thereby achieving energy conservation, consumption reduction, and stable operation while ensuring that the effluent meets standards.

[0003] Wastewater pretreatment is a crucial step in water quality analysis and environmental monitoring. Its purpose is to remove suspended solids and particulate impurities from wastewater that may interfere with subsequent testing, ensuring the representativeness and accuracy of the sampled data. In practice, filtration devices are often used for preliminary wastewater purification, especially when sampling from process units such as influent, biological treatment tanks, or secondary sedimentation tanks. Effective pretreatment helps ensure the reliability of key indicators such as COD, ammonia nitrogen, pH, and sludge concentration. Existing wastewater filtration devices typically incorporate filter screens or cartridges to intercept larger particles, thereby protecting downstream analytical equipment and improving sample quality. However, during sampling, some existing wastewater filtration devices experience increased flow resistance due to filter screen clogging by trapped debris, affecting subsequent filtration efficiency and stability. Furthermore, the filter screens are often located internally, making quick disassembly and cleaning difficult, requiring frequent maintenance shutdowns, which negatively impacts filtration performance under continuous sampling or long-term operation conditions. Therefore, existing technologies have limitations in terms of filtration continuity and ease of maintenance when dealing with wastewater with high impurity content. Utility Model Content

[0004] This invention provides an integrated two-stage filtration device for laboratory wastewater pretreatment, aiming to solve the problems of existing wastewater filtration devices when processing water samples with high impurity content. These problems include increased flow resistance and decreased filtration efficiency due to easy clogging of the filter screen by debris, and the difficulty in quickly disassembling and cleaning the filter structure due to its deep location inside the device, which affects the stability of continuous sampling operations. To achieve the above objectives, this invention is implemented through the following technical solution: Design an integrated two-stage filtration device for laboratory wastewater pretreatment, comprising an outer cylinder, a primary filtration assembly, a secondary filtration assembly, and a quick-release sealing cap. The outer cylinder is a vertical cylindrical shape with an internally threaded connection at the top and a liquid outlet at the bottom. The quick-release sealing cap is threadedly connected to the top of the outer cylinder, and has a liquid inlet channel at its center. The primary filtration assembly, located below the quick-release sealing cap, includes an annular support frame, a coarse filter screen, and a rotating scraper. The annular support frame is fixedly connected to the bottom of the quick-release sealing cap. The coarse filter screen, made of woven metal wire with a pore size ranging from 200 to 500 micrometers, is fitted around the annular support frame. The rotating scraper... The system includes a scraper arm and a drive shaft. One end of the scraper arm is hinged to the outer wall of the drive shaft, and the other end is attached to the outer surface of the coarse filter screen. The upper end of the drive shaft passes through a quick-release sealing cover and is fixedly connected to an external handle. The secondary filtration assembly is located in the lower part of the inner cavity of the outer cylinder and includes a filter element seat, a fine filter cartridge, and a flow guide cone. The filter element seat is fixedly connected to the bottom of the inner wall of the outer cylinder. The fine filter cartridge is made of porous ceramic material with a pore size ranging from ten to fifty micrometers. The bottom of the fine filter cartridge is closed, and the top is open. Its outer wall forms an annular liquid collection cavity with the inner wall of the outer cylinder. The flow guide cone is located directly above the fine filter cartridge, with the larger end of the flow guide cone facing upward and the smaller end facing downward. Its outer edge is fixedly connected to the inner wall of the outer cylinder. The center of the flow guide cone has a through hole, which is aligned with the top opening of the fine filter cartridge.

[0005] Optionally, the quick-release sealing cover has anti-slip texture on its outer periphery, and an elastic sealing gasket is provided between the quick-release sealing cover and the outer cylinder, the sealing gasket being embedded in the annular groove on the bottom surface of the quick-release sealing cover.

[0006] Optionally, the annular support frame consists of three radial support rods evenly distributed along the circumference, each radial support rod having a buckle at its end, and the top edge of the coarse filter screen cover having a retaining ring that engages with the buckle, thereby enabling the coarse filter screen cover to be detachably installed.

[0007] Optionally, the scraper arm is made of flexible silicone material, and has multiple arc-shaped protrusions on the side that fits the coarse filter screen. A torsion spring is provided at the hinge point between the scraper arm and the drive shaft so that the scraper arm is always pressed tightly against the surface of the coarse filter screen.

[0008] Optionally, a shaft seal structure is provided at the position where the drive shaft passes through the quick-release sealing cover. The shaft seal structure includes a clamping nut, sealing packing, and a stuffing box. The stuffing box is fixed on the quick-release sealing cover, the sealing packing is filled inside the stuffing box, and the clamping nut is screwed onto the outer end of the stuffing box to adjust the compression of the sealing packing.

[0009] Optionally, the outer wall of the fine filter cartridge is provided with several longitudinal reinforcing ribs, which extend along the height direction of the fine filter cartridge, and a flow guiding gap is formed between adjacent reinforcing ribs, which is connected to the annular liquid collection cavity.

[0010] Optionally, the filter element holder has a positioning boss at its center, and the bottom of the fine filter cartridge has a positioning groove that matches the positioning boss. The fine filter cartridge is precisely installed through the cooperation of the positioning boss and the positioning groove.

[0011] Optionally, an annular shoulder is provided in the middle of the inner wall of the outer cylinder. The annular shoulder is located between the primary filter assembly and the secondary filter assembly. A filter media layer is placed on the annular shoulder. The filter media layer is made of a mixture of activated carbon particles and quartz sand and has a thickness of 30 mm.

[0012] Optionally, the liquid outlet is located at the center of the bottom of the outer cylinder, and the inner wall of the liquid outlet is provided with internal threads for connecting the downstream sampling pipeline. The outside of the liquid outlet is provided with a hexagonal flange for easy wrench operation.

[0013] Optionally, the outer wall of the outer cylinder is provided with a transparent observation window, which is made of high-strength glass. Its upper and lower edges are sealed to the outer cylinder through metal pressure rings, and the area covered by the transparent observation window corresponds to the location of the secondary filter component.

[0014] This utility model provides an integrated two-stage filtration device for laboratory wastewater pretreatment, which has the following advantages: The device achieves graded interception of large particulate impurities and fine suspended solids in wastewater through a series arrangement of primary and secondary filtration components. The primary filtration component adopts a rotatable scraping structure; without interrupting the filtration process, the scraper arm is manually rotated to remove debris adhering to the surface of the coarse filter screen, effectively maintaining the permeability of the primary filtration. The secondary filtration component uses a porous ceramic fine filter cartridge, whose rigid structure is not easily deformed, and the annular liquid collection cavity formed between it and the outer cylinder ensures uniform collection of the filtered liquid. The quick-release sealing cap design allows the entire primary filtration component to be removed along with the cap, and the coarse filter screen can be quickly replaced or cleaned through a snap-fit ​​structure, significantly shortening maintenance time. The guide cone guides the water flow to be evenly distributed to the top of the fine filter cartridge, avoiding filter media damage caused by localized scouring. The filter media layer added in the middle of the outer cylinder further enhances the adsorption capacity for organic pollutants and colloidal substances. The transparent observation window allows operators to visually judge the clogging status of the fine filter cartridge and arrange maintenance plans in a timely manner. The synergistic effect of the above structures significantly extends the continuous operating time of the device in high-impurity wastewater environments and ensures the representativeness of the sampled water quality and the accuracy of the analytical data. Attached Figure Description

[0015] Figure 1 This is a cross-sectional view of the overall structure of this utility model; Figure 2 For the present utility model Figure 1 Enlarged schematic diagram of structure A in the middle; In the diagram, 1. Outer cylinder; 2. Primary filter assembly; 3. Secondary filter assembly; 4. Quick-release sealing cap; 5. Internal threaded connection section; 6. Liquid outlet; 7. Liquid inlet channel; 8. Annular support frame; 9. Coarse filter screen cover; 10. Rotary scraper; 11. Scraper arm; 12. Drive shaft; 13. Handle; 14. Anti-slip texture; 15. Elastic sealing gasket; 16. Radial support rod; 17. Buckle; 18. Snap ring; 19. Arc-shaped protrusion; 20. Torsion spring; 21. Shaft seal structure; 22. Fine filter cartridge; 23. Flow guide cone; 24. Annular liquid collection chamber; 25. Transparent observation window. Detailed Implementation To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. The components of the embodiments of this utility model described and shown in the accompanying drawings can typically be arranged and designed in various different configurations.

[0016] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0017] It should be noted that, where there is no conflict, the embodiments and features in the embodiments of this utility model can be combined with each other.

[0018] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0019] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of this utility model is in use, or the orientation or positional relationship commonly understood by those skilled in the art. They are only used for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. In addition, the terms "first," "second," etc., are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0020] In the description of this utility model, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0021] Please see Figures 1 to 2 This invention provides an integrated two-stage filtration device for laboratory wastewater pretreatment. The device has a vertical cylindrical structure and is suitable for pretreating wastewater containing high concentrations of suspended particles, organic debris, and colloidal substances in laboratory environments to ensure the cleanliness and representativeness of the water used for subsequent analytical instruments. The device consists of an outer cylinder 1, a primary filtration assembly 2, a secondary filtration assembly 3, and a quick-release sealing cap 4. The components are mechanically connected, positioned, and sealed to achieve stable assembly and efficient filtration.

[0022] like Figure 1 As shown, the outer cylinder 1 is an integrally formed cylindrical shell with an internally threaded connection section 5 at the top opening and a liquid outlet 6 at the bottom center. The inner wall of the liquid outlet 6 is machined with internal threads for threaded connection to the downstream sampling pipeline; the outer surface of the liquid outlet 6 is integrally formed with a hexagonal flange for easy disassembly and assembly using a wrench. A transparent observation window 25 is embedded in the middle area of ​​the outer wall of the outer cylinder 1. The transparent observation window 25 is made of high-strength borosilicate glass, and its upper and lower edges are sealed to the outer cylinder 1 by metal pressure rings to ensure no liquid leakage. The area covered by the transparent observation window 25 faces the location of the secondary filter assembly 3, allowing operators to directly observe whether there is blockage or dirt accumulation on the surface of the fine filter cartridge 22.

[0023] The quick-release sealing cap 4 is a circular cap with anti-slip texture 14 on its outer circumference for easy manual tightening or loosening. An annular groove is formed on the bottom surface of the quick-release sealing cap 4, and an elastic sealing gasket 15 is embedded in this groove. When the quick-release sealing cap 4 is screwed onto the internal threaded connection section 5 at the top of the outer cylinder 1, the elastic sealing gasket 15 is deformed under pressure, achieving a liquid-tight connection between the quick-release sealing cap 4 and the outer cylinder 1. A liquid inlet channel 7 is formed through the center of the quick-release sealing cap 4 for introducing laboratory wastewater to be treated.

[0024] Reference Figure 2The primary filter assembly 2 is installed below the quick-release sealing cover 4 and is removed or installed from the top of the outer cylinder 1 along with the quick-release sealing cover 4. The primary filter assembly 2 includes an annular support frame 8, a coarse filter screen 9, and a rotating scraper 10. The annular support frame 8 consists of three radially distributed support rods 16, one end of which is fixedly connected to the center area of ​​the bottom surface of the quick-release sealing cover 4, and the other end extends outward and is provided with a buckle 17. The coarse filter screen 9 is a cylindrical structure made of woven stainless steel wire with a pore size ranging from 200 to 500 micrometers. Its top edge is provided with a retaining ring 18 that matches the buckle 17. During installation, the coarse filter screen 9 is fitted onto the outer circumference of the annular support frame 8, so that the retaining ring 18 is engaged with the buckle 17, thus completing the detachable fixation of the coarse filter screen 9. This structure allows the coarse filter screen 9 to be quickly replaced or cleaned simply by opening the quick-release sealing cover 4 without disassembling the entire device.

[0025] The rotating scraper 10 includes a scraper arm 11, a drive shaft 12, and a handle 13. The drive shaft 12 is a solid metal rod, with its upper end passing through the center of the quick-release sealing cover 4 and welded to the handle 13. Its lower end extends into the outer cylinder 1 and is located at the axis of the coarse filter screen 9. One end of the scraper arm 11 is connected to the outer wall of the drive shaft 12 via a hinge shaft, and the other end is attached to the outer surface of the coarse filter screen 9. The scraper arm 11 is made of flexible silicone material, and its side that is attached to the coarse filter screen 9 has multiple arc-shaped protrusions 19. The arc-shaped protrusions 19 are spaced apart along the length of the scraper arm 11 to enhance the scraping effect on attached impurities. A torsion spring 20 is installed at the hinge point. One end of the torsion spring 20 abuts against the scraper arm 11, and the other end abuts against the drive shaft 12, so that the scraper arm 11 is always pressed tightly against the outer surface of the coarse filter screen 9 in its natural state. When the operator turns the handle 13, the drive shaft 12 drives the scraper arm 11 to rotate around the outer periphery of the coarse filter screen 9, and the arc-shaped protrusion 19 scrapes off the debris attached to the surface of the coarse filter screen 9 to prevent clogging.

[0026] A shaft seal structure 21 is provided at the position where the drive shaft 12 passes through the quick-release sealing cover 4. The shaft seal structure 21 includes a stuffing box, sealing packing, and a clamping nut. The stuffing box is fixedly connected to the upper surface of the quick-release sealing cover 4, the sealing packing fills the internal cavity of the stuffing box, and the clamping nut is screwed onto the outer end of the stuffing box. By adjusting the screwing depth of the clamping nut, the compression of the sealing packing can be controlled, thereby achieving dynamic sealing of the drive shaft 12 during rotation and preventing sewage from leaking from the periphery of the inlet channel 7.

[0027] like Figure 1As shown, the secondary filtration assembly 3 is located in the lower part of the inner cavity of the outer cylinder 1, and includes a filter element seat, a fine filter cartridge 22, and a flow guide cone 23. The filter element seat is fixedly connected to the bottom of the inner wall of the outer cylinder 1, and has an upwardly protruding positioning boss at its center. The fine filter cartridge 22 is a cylindrical filter element made of porous ceramic material with a pore size ranging from ten to fifty micrometers. It is closed at the bottom and open at the top. A positioning groove matching the positioning boss of the filter element seat is opened at the center of the bottom of the fine filter cartridge 22. During installation, the positioning groove at the bottom of the fine filter cartridge 22 is aligned with the positioning boss of the filter element seat and then pressed down to achieve precise positioning and stable installation of the fine filter cartridge 22. Several longitudinal reinforcing ribs are provided along the height direction on the outer wall of the fine filter cartridge 22. A flow guide gap is formed between adjacent reinforcing ribs. The flow guide gap is connected to the annular liquid collection cavity 24 formed between the inner wall of the outer cylinder 1, ensuring that the filtered liquid flows evenly into the annular liquid collection cavity 24 along the outer wall of the fine filter cartridge 22 and finally collects at the outlet 6 for discharge.

[0028] The guide cone 23 is located directly above the fine filter cartridge 22, with its larger end facing upwards and its smaller end facing downwards, forming an inverted cone shape. The outer edge of the guide cone 23 is fixedly connected to the inner wall of the outer cylinder 1 by welding or bonding, and a through hole is opened in its center, which is coaxially aligned with the top opening of the fine filter cartridge 22. The wastewater after primary filtration first impacts the top surface of the guide cone 23, and then flows evenly along its conical surface to the top opening area of ​​the fine filter cartridge 22, avoiding concentrated water flow that scours a local area of ​​the fine filter cartridge 22 and preventing the filter media from being damaged due to localized high pressure.

[0029] An annular shoulder is located in the middle of the inner wall of the outer cylinder 1, between the primary filter assembly 2 and the secondary filter assembly 3. A filter media layer is placed on the annular shoulder. This filter media layer is composed of activated carbon particles and quartz sand mixed in a 1:1 mass ratio, with a total thickness of 30 millimeters. This filter media layer further adsorbs and removes organic pollutants, pigments, and some colloidal substances from the wastewater after primary filtration, improving the overall filtration effect.

[0030] In practical use, laboratory wastewater first enters the outer cylinder 1 through the inlet channel 7, impacts the guide cone 23, and is then evenly distributed onto the outer surface of the coarse filter screen 9. Large particles are intercepted by the coarse filter screen 9, while fine suspended matter passes through the filter screen and enters the inner cavity of the outer cylinder 1. Operators can periodically rotate the handle 13 to rotate the scraper arm 11, removing any adhering material from the surface of the coarse filter screen 9. The wastewater continues to flow downwards, passing through the middle filter media layer, and is then guided by the guide cone 23 into the fine filter cartridge 22. The fine filter cartridge 22 performs fine filtration of the wastewater, and the filtered clear liquid passes through the side wall of the fine filter cartridge 22 into the annular collection chamber 24, and is finally discharged from the outlet 6 to the downstream analysis system. Throughout the process, the transparent observation window 25 allows for real-time monitoring of the working status of the fine filter cartridge 22. The quick-release sealing cap 4 and the snap-on coarse filter screen 9 significantly shorten maintenance time and ensure the stability of continuous sampling operations.

[0031] Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. An integrated two-stage filtration device for laboratory wastewater pretreatment, characterized in that: The system includes an outer cylinder, a primary filter assembly, a secondary filter assembly, and a quick-release sealing cap. The outer cylinder is a vertical cylindrical shape with an internally threaded connection at the top and a liquid outlet at the bottom. The quick-release sealing cap is threadedly connected to the top of the outer cylinder and has a liquid inlet channel at its center. The primary filter assembly, located below the quick-release sealing cap, includes an annular support frame, a coarse filter screen, and a rotating scraper. The annular support frame is fixedly connected to the bottom surface of the quick-release sealing cap. The coarse filter screen, made of woven metal wire with a pore size ranging from 200 to 500 micrometers, is fitted around the annular support frame. The rotating scraper includes a scraper arm and a drive shaft. One end is hinged to the outer wall of the drive shaft, and the other end is attached to the outer surface of the coarse filter screen. The upper end of the drive shaft passes through the quick-release sealing cover and is fixedly connected to the external handle. The secondary filter assembly is located in the lower part of the inner cavity of the outer cylinder and includes a filter element seat, a fine filter cartridge, and a flow guide cone. The filter element seat is fixedly connected to the bottom of the inner wall of the outer cylinder. The fine filter cartridge is made of porous ceramic material with a pore size ranging from ten to fifty micrometers. The bottom of the fine filter cartridge is closed and the top is open. An annular liquid collection cavity is formed between its outer wall and the inner wall of the outer cylinder. The flow guide cone is located directly above the fine filter cartridge. The large end of the flow guide cone faces upward and the small end faces downward. Its outer edge is fixedly connected to the inner wall of the outer cylinder. A through hole is provided in the center of the flow guide cone, which is aligned with the top opening of the fine filter cartridge.

2. The integrated two-stage filtration device for laboratory wastewater pretreatment according to claim 1, characterized in that: The quick-release sealing cover has anti-slip texture on its outer circumference, and an elastic sealing gasket is provided between the quick-release sealing cover and the outer cylinder. The sealing gasket is embedded in the annular groove on the bottom surface of the quick-release sealing cover.

3. The integrated two-stage filtration device for laboratory wastewater pretreatment according to claim 1, characterized in that: The annular support frame consists of three radial support rods evenly distributed along the circumference. Each radial support rod has a buckle at its end. The top edge of the coarse filter screen cover has a retaining ring that engages with the buckle, enabling the coarse filter screen cover to be detachably installed.

4. The integrated two-stage filtration device for laboratory wastewater pretreatment according to claim 1, characterized in that: The scraper arm is made of flexible silicone material, and has multiple arc-shaped protrusions on the side that fits the coarse filter screen. A torsion spring is provided at the hinge point between the scraper arm and the drive shaft so that the scraper arm is always pressed tightly against the surface of the coarse filter screen.

5. An integrated two-stage filtration device for laboratory wastewater pretreatment according to claim 1, characterized in that: The drive shaft is provided with a shaft seal structure at the position where it passes through the quick-release sealing cover. The shaft seal structure includes a clamping nut, sealing packing, and a stuffing box. The stuffing box is fixed on the quick-release sealing cover, the sealing packing is filled inside the stuffing box, and the clamping nut is screwed onto the outer end of the stuffing box to adjust the compression of the sealing packing.

6. An integrated two-stage filtration device for laboratory wastewater pretreatment according to claim 1, characterized in that: The outer wall of the fine filter cartridge is provided with several longitudinal reinforcing ribs, which extend along the height direction of the fine filter cartridge. A flow guiding gap is formed between adjacent reinforcing ribs, and the flow guiding gap is connected to the annular liquid collection cavity.

7. An integrated two-stage filtration device for laboratory wastewater pretreatment according to claim 1, characterized in that: The filter element holder has a positioning boss at its center, and the bottom of the fine filter cartridge has a positioning groove that matches the positioning boss. The fine filter cartridge is precisely installed through the cooperation of the positioning boss and the positioning groove.

8. An integrated two-stage filtration device for laboratory wastewater pretreatment according to claim 1, characterized in that: The inner wall of the outer cylinder is provided with an annular shoulder in the middle. The annular shoulder is located between the primary filter component and the secondary filter component. A filter media layer is placed on the annular shoulder. The filter media layer is filled with a mixture of activated carbon particles and quartz sand.

9. An integrated two-stage filtration device for laboratory wastewater pretreatment according to claim 1, characterized in that: The outer cylinder has a transparent observation window on its outer wall. The transparent observation window is made of high-strength glass, and its upper and lower edges are sealed to the outer cylinder through metal pressure rings. The area covered by the transparent observation window corresponds to the location of the secondary filter component.

10. An integrated two-stage filtration device for laboratory wastewater pretreatment according to claim 1, characterized in that: The liquid outlet is located at the center of the bottom of the outer cylinder. The inner wall of the liquid outlet is provided with internal threads for connecting the downstream sampling pipeline. The outside of the liquid outlet is provided with a hexagonal flange for easy wrench operation.

Images