A multi-layer filter box assembly for wastewater treatment

Abstract

This utility model relates to the technical field of filter box assemblies, and particularly to a multi-layer filter box assembly for wastewater treatment. The assembly includes a multi-layer box assembly comprising a square main shell and a drain bottom shell. The drain bottom shell is installed on the lower end face of the square main shell and is sealed to it. A diversion inner cover is installed on the upper end face of the square main shell and is detachably fixed to it. An inlet cover assembly is provided above the diversion inner cover and is sealed to it. This application, through the diversion function of the diversion inner cover and the arrangement of the multi-layer filter plate assembly, allows wastewater to pass through the filter components more evenly, improving filtration efficiency and quality, and effectively intercepting impurities in the wastewater. Simultaneously, the design of the pull-out and detachable filter plate assembly and flushing components facilitates cleaning and replacement of the filter components, reducing maintenance costs and time, and extending the service life of the equipment.

Description

Technical Field

[0001] This utility model relates to the field of filter box assembly technology, and in particular to a multi-layer filter box assembly for sewage treatment. Background Technology

[0002] In modern industrial production and urban life, wastewater treatment is a crucial link in ensuring the sustainable development of the ecological environment. Filtration, as the core process for separating impurities and purifying water in wastewater treatment, directly affects the energy consumption of subsequent treatment processes and the final effluent standards. Currently, there are many types of wastewater treatment filtration equipment on the market, among which box-type filter devices are widely used in small and medium-sized wastewater treatment scenarios due to their compact structure and convenient operation.

[0003] However, traditional box-type filter devices often use a single pipe for direct inlet flow. After sewage enters the main shell, it is prone to local turbulence due to the concentrated impact of the water flow. This results in uneven stress on the surface of the filter components. Some areas become clogged quickly due to excessive load, while other areas have low filtration efficiency due to insufficient water contact. This seriously affects the overall filtration quality and the stability of equipment operation.

[0004] Meanwhile, most filter components are fixedly installed. When impurities accumulate to a certain extent on the surface of the filter medium, the main housing needs to be disassembled and the machine stopped for cleaning or replacement. This not only consumes a lot of manpower and time, but the frequent disassembly and assembly operations will also aggravate the wear and tear of the equipment components, shorten the service life of the device, and increase long-term maintenance costs. On the other hand, the composition, particle size, and concentration of impurities vary significantly from different wastewater sources (such as industrial wastewater, domestic sewage, and rainwater runoff), resulting in different requirements for filtration precision. However, the specifications of existing filtration devices are fixed, making it difficult to flexibly adjust the filtration stages or media pore size according to actual water quality conditions. To adapt to different treatment scenarios, it is often necessary to replace the entire filtration equipment, which not only increases the initial investment cost but also limits the applicability of the device. Utility Model Content

[0005] This utility model solves the problems in related technologies and proposes a multi-layer filter box assembly for sewage treatment.

[0006] To solve the above-mentioned technical problems, this utility model is achieved through the following technical solution: A multi-layer filter box assembly for wastewater treatment includes a multi-layer box assembly comprising a square main shell and a drain bottom shell. The drain bottom shell is installed on the lower end face of the square main shell and is sealed to the square main shell. A diversion inner cover is installed on the upper end face of the square main shell and is detachably and fixedly connected to the square main shell. An inlet cover assembly is provided above the diversion inner cover and is sealed to the square main shell. Several sets of removable filter plates are arranged from top to bottom in the diversion inner cover. A flushing assembly for cleaning the filter plate assembly is also fixedly installed on the outer side of the square main shell.

[0007] As a preferred embodiment, the diversion inner cover includes a main frame shell and a diversion mesh assembly. The main frame shell is inserted into the square main shell, and the diversion mesh assembly is fixedly installed on the upper end face of the main frame shell.

[0008] As a preferred embodiment, the main frame shell is provided with connecting ear plates on both sides. The connecting ear plates are integrally formed with the main frame shell, and the connecting ear plates are provided with several connecting holes.

[0009] As a preferred embodiment, the diversion mesh group includes a central column and inclined mesh panels. The central column is located at the center of the main frame, and the inclined mesh panels are evenly installed on the outer surface of the central column, with the lower end of the inclined mesh panels fixedly connected to the main frame.

[0010] As a preferred embodiment, the liquid inlet cover assembly includes a cover shell and a central tube, wherein the central tube is vertically installed at the center of the upper end face of the cover shell and is fixedly connected to the cover shell.

[0011] As a preferred embodiment, the filter plate assembly includes a pull-out frame and a metal mesh plate. The metal mesh plate is inserted and installed in the middle of the pull-out frame, and the front end face of the square main shell is provided with several positioning grooves for installing the pull-out frame.

[0012] As a preferred embodiment, the rinsing assembly includes a seat plate, a concave clamping plate, a guide seat, and a spray pipe assembly. The seat plate is fixedly installed on the outer side of the square main shell, the concave clamping plate is fixedly installed at both ends of the seat plate, the guide seat is fixedly installed at the lower end of the concave clamping plate, the spray pipe assembly is slidably installed on the guide seat, and a drive electric cylinder for driving the spray pipe assembly to reciprocate up and down is also installed on the guide seat.

[0013] As a preferred embodiment, the guide seat includes a connecting base plate and a vertical track for sliding installation of the spray pipe assembly, the vertical track being vertically fixed to the upper end face of the connecting base plate.

[0014] As a preferred embodiment, the spray pipe assembly includes a vertical frame, several horizontal spray pipes, and a liquid supply pipe assembly. The vertical frame is slidably installed on a vertical track, and the horizontal spray pipes are evenly fixed on the vertical frame from top to bottom. The lower end face of the liquid supply pipe assembly is connected to an external water pump, and the head of the liquid supply pipe assembly is connected to several horizontal spray pipes respectively.

[0015] Compared with existing technologies, the beneficial effects of this utility model are as follows: This application, through the diversion effect of the inner cover and the arrangement of multiple filter plates, allows sewage to pass through the filter components more evenly, improving filtration efficiency and quality, and effectively intercepting impurities in the sewage. Simultaneously, the design of the pull-out and detachable filter plates and flushing assembly facilitates cleaning and replacement of the filter components, reducing maintenance costs and time, and extending the service life of the equipment. Furthermore, the number and specifications of the filter plates can be adjusted according to different sewage treatment needs, making it suitable for sewage treatment of different scales and water qualities. Attached Figure Description

[0016] Figure 1 This is a perspective view of the overall structure in an embodiment of this utility model; Figure 2 yes Figure 1 A front view of the device shown; Figure 3 yes Figure 1 An exploded view of the device shown. Figure 4 This is a perspective view of the diversion inner cover in an embodiment of this utility model; Figure 5 This is a perspective view of the filter plate assembly in an embodiment of this utility model; Figure 6 This is a perspective view of the rinsing assembly in an embodiment of the present utility model; Figure 7 yes Figure 6 Side view of the device shown.

[0017] In the diagram: 1. Multi-layer tank assembly; 11. Square main shell; 111. Positioning groove; 12. Drainage bottom shell; 2. Diversion inner cover; 21. Main frame shell; 211. Connecting ear plate; 22. Diversion mesh assembly; 221. Central column rod; 222. Sloping mesh; 3. Liquid inlet cover assembly; 31. Cover shell; 32. Central tube; 4. Filter plate assembly; 41. Pull-out frame; 42. Metal mesh plate; 5. Flushing assembly; 51. Seat plate; 52. Concave clamp plate; 53. Guide seat; 531. Connecting bottom plate; 532. Vertical track; 54. Spray pipe assembly; 541. Vertical frame; 542. Horizontal spray pipe; 543. Liquid supply pipe assembly; 55. Drive electric cylinder. Detailed Implementation

[0018] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit the present utility model or its application or use. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the scope of protection of the present utility model.

[0019] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0020] Unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps described in these embodiments do not limit the scope of this invention. It should also be understood that, for ease of description, the dimensions of the various parts shown in the drawings are not drawn to actual scale. Techniques, methods, and devices known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be considered part of the specification. In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters in the following figures denote similar items; therefore, once an item is defined in one figure, it need not be further discussed in subsequent figures.

[0021] In the description of this utility model, it should be understood that the directional terms such as "front, back, up, down, left, right", "horizontal, vertical, horizontal" and "top, bottom" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description. Unless otherwise stated, these directional terms 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, and therefore should not be construed as a limitation on the scope of protection of this utility model. The directional terms "inner" and "outer" refer to the inner and outer contours relative to the outline of each component itself.

[0022] For ease of description, spatial relative terms such as "above," "over," "on the upper surface of," "above," etc., are used herein to describe the spatial positional relationship of a device or feature as shown in the figures to other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation beyond the orientation of the device as described in the figures. For example, if the device in the figures were inverted, a device described as "above" or "above" other devices or structures would subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein will be interpreted accordingly.

[0023] Furthermore, it should be noted that the use of terms such as "first" and "second" to define components is merely for the purpose of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore cannot be construed as limiting the scope of protection of this utility model.

[0024] Example 1

[0025] Reference Figure 1 , Figure 2 and Figure 3 As shown, a multi-layer filter box assembly for wastewater treatment includes a multi-layer box assembly 1. The multi-layer box assembly 1 includes a square main shell 11 and a drain bottom shell 12. The drain bottom shell 12 is installed on the lower end face of the square main shell 11 and is sealed to the square main shell 11. The square main shell 11 and the drain bottom shell 12 can be made of 304 stainless steel, which has good corrosion resistance and strength. A diversion inner cover 2 is installed on the upper end face of the square main shell 11. The diversion inner cover 2 is detachably fixed to the square main shell 11. An inlet cover assembly 3 is provided above the diversion inner cover 2. The inlet cover assembly 3 is sealed to the square main shell 11. Several sets of removable filter plate assemblies 4 are arranged from top to bottom in the diversion inner cover 2. A flushing assembly 5 for cleaning the filter plate assemblies 4 is also fixedly installed on the outer side of the square main shell 11. By setting up the multi-layer box assembly 1, including the square main shell 11 and the drain bottom shell 12, the initial containment and discharge functions of wastewater are realized. The drain bottom shell 12 is sealed to the square main shell 11 to prevent sewage leakage. The diversion inner cover 2 can divert the incoming sewage, allowing it to enter the filter plate assembly 4 more evenly and improving filtration efficiency. The inlet cover assembly 3 is sealed to the square main shell 11 to ensure the airtightness of the sewage inlet. The pull-out and detachable filter plate assembly 4 facilitates the cleaning and replacement of the filter components, while the flushing assembly 5 allows for regular cleaning of the filter plate assembly 4, maintaining its filtration performance and extending its service life.

[0026] Reference Figure 3 and Figure 4 As shown, the inner diversion cover 2 includes a main frame shell 21 and a diversion mesh assembly 22. The main frame shell 21 is inserted into the square main shell 11, and the diversion mesh assembly 22 is fixedly installed on the upper end face of the main frame shell 21. The inner diversion cover 2 includes a main frame shell 21 and a diversion mesh assembly 22. The main frame shell 21 is inserted into the square main shell 11 for easy installation and disassembly. The diversion mesh assembly 22 is fixedly installed on the upper end face of the main frame shell 21, which can initially divert and disperse the incoming sewage, making the sewage more evenly distributed on the filter plate assembly 4, avoiding excessive local filtration pressure, and improving the overall filtration effect. Connecting ear plates 211 are provided on both sides of the main frame shell 21. The connecting ear plates 211 are integrally formed with the main frame shell 21, and several connecting holes are provided on the connecting ear plates 211. The connecting ear plate 211 and the connecting hole facilitate the fixed connection between the inner diverter cover 2 and the square main shell 11, ensuring the stability and sealing of the connection. The main frame shell 21 can be made of ABS engineering plastic, which has good processability and strength. The diverter mesh assembly 22 can be made of 316L stainless steel, which has better corrosion resistance.

[0027] Reference Figure 4 As shown, the diversion mesh assembly 22 includes a central column 221 and inclined mesh panels 222. The central column 221 is located at the center of the main frame shell 21, and the inclined mesh panels 222 are evenly installed on the outer surface of the central column 221, with the lower end of the inclined mesh panels 222 fixedly connected to the main frame shell 21. This structural design allows wastewater entering from the central pipe 32 to be dispersed in all directions through the inclined mesh panels 222, further improving the diversion effect and ensuring that the wastewater covers the filter plate assembly 4 more evenly.

[0028] Reference Figure 3 As shown, the inlet cover assembly 3 includes a cover shell 31 and a central tube 32. The central tube 32 is vertically installed at the center of the upper end face of the cover shell 31 and is fixedly connected to the cover shell 31. The central tube 32 facilitates the introduction of wastewater into the diversion inner cover 2, while the cover shell 31 provides sealing and protection, ensuring that wastewater can smoothly enter the multi-layer filter box assembly. The cover shell 31 can be made of PP plastic, which has good corrosion resistance and processability. The central tube 32 can be made of PVC pipe.

[0029] Reference Figure 5As shown, the filter plate assembly 4 includes a pull-out frame 41 and a metal mesh plate 42. The metal mesh plate 42 is inserted and installed in the middle of the pull-out frame 41. The front face of the square main shell 11 has several positioning slots 111 for installing the pull-out frame 41. The design of the pull-out frame 41 and the positioning slots 111 allows the filter plate assembly 4 to be easily pulled out and disassembled, facilitating the cleaning and replacement of the metal mesh plate 42. The metal mesh plate 42 has good filtration performance and can effectively intercept impurities in wastewater. The pull-out frame 41 can be made of ABS engineering plastic. The metal mesh plate 42 can be made of 316L stainless steel mesh with different mesh sizes, selected according to actual needs.

[0030] Example 2

[0031] Reference Figure 1 and Figure 6 As shown, a multi-layer filter box assembly for wastewater treatment includes a multi-layer box assembly 1. The multi-layer box assembly 1 includes a square main shell 11 and a drain bottom shell 12. The drain bottom shell 12 is installed on the lower end face of the square main shell 11 and is sealed to the square main shell 11. A diversion inner cover 2 is installed on the upper end face of the square main shell 11. The diversion inner cover 2 is detachably fixed to the square main shell 11. An inlet cover assembly 3 is provided above the diversion inner cover 2. The inlet cover assembly 3 is sealed to the square main shell 11. Several sets of removable filter plate assemblies 4 are arranged from top to bottom in the diversion inner cover 2. A flushing assembly 5 for cleaning the filter plate assembly 4 is also fixedly installed on the outer side of the square main shell 11.

[0032] Reference Figure 6 and Figure 7As shown, the rinsing assembly 5 includes a seat plate 51, a concave clamping plate 52, a guide seat 53, and a spray pipe assembly 54. The seat plate 51 is fixedly installed on the outer side of the square main shell 11. The concave clamping plate 52 is fixedly installed at both ends of the seat plate 51. The guide seat 53 is fixedly installed at the lower end of the concave clamping plate 52. The spray pipe assembly 54 is slidably installed on the guide seat 53, and a drive cylinder 55 for driving the spray pipe assembly 54 to reciprocate up and down is also installed on the guide seat 53. The drive cylinder 55 can drive the spray pipe assembly 54 to move up and down reciprocally, thoroughly rinsing the filter plate assembly 4 and improving the cleaning effect. The seat plate 51, concave clamp plate 52 and guide seat 53 ensure the stability and accuracy of the movement of the spray pipe assembly 54.

[0033] Reference Figure 6 and Figure 7 As shown, the guide seat 53 includes a connecting base plate 531 and a vertical rail 532 for sliding installation of the spray pipe assembly 54. The vertical rail 532 is vertically fixed to the upper end face of the connecting base plate 531. The guide seat 53 includes a connecting base plate 531 and a vertical rail 532 for sliding installation of the spray pipe assembly 54. The vertical rail 532 is vertically fixed to the upper end face of the connecting base plate 531. The vertical rail 532 provides guidance for the up-and-down movement of the spray pipe assembly 54, ensuring the straightness and stability of the movement of the spray pipe assembly 54, making the rinsing more uniform and effective.

[0034] Reference Figure 6 and Figure 7As shown, the spray pipe assembly 54 includes a vertical frame 541, several horizontal spray pipes 542, and a liquid supply pipe assembly 543. The vertical frame 541 is slidably mounted on a vertical track 532. The horizontal spray pipes 542 are evenly fixed on the vertical frame 541 from top to bottom. The lower end face of the liquid supply pipe assembly 543 is connected to an external water pump, and the head of the liquid supply pipe assembly 543 is connected to several horizontal spray pipes 542 respectively. An external water pump delivers cleaning fluid to the transverse spray nozzle 542 via a supply pipe assembly 543. The transverse spray nozzle 542 provides stable rinsing of the filter plate assembly 4, improving the cleaning effect. The sliding of the vertical frame 541 on the vertical track 532 ensures comprehensive rinsing. The transverse spray nozzle 542 can be made of PVC pipe. The supply pipe assembly 543 can be made of rubber hose. The drive cylinder 55 can be a miniature DC cylinder of model MD-C20, which has the advantages of small size and high precision.

[0035] Working principle: In actual installation, the multi-layer tank assembly 1 is assembled first. The drain bottom shell 12 is installed on the lower end face of the square main shell 11, and a sealing strip is used for sealing to ensure a good seal. The square main shell 11 can be made of stainless steel, such as 304 stainless steel, which has good corrosion resistance and strength. The drain bottom shell 12 is also made of the same material to ensure overall durability. Then, the diversion inner cover 2 is installed. The main frame shell 21 is inserted into the square main shell 11, and the diversion inner cover 2 is fixed to the square main shell 11 with bolts through the connecting holes on the connecting ear plate 211. The main frame shell 21 can be made of plastic, such as polypropylene (PP), which is lightweight and corrosion resistant. The central column 221 and the inclined mesh 222 of the diversion mesh assembly 22 can be made of stainless steel to ensure diversion effect and durability. Next, the inlet cover assembly 3 is installed. The central tube 32 is vertically installed at the center of the upper end face of the cover shell 31, and the connection is made by welding or sealant to ensure a tight seal. The cover 31 can be made of plastic, such as polyvinyl chloride (PVC), which has good corrosion resistance and sealing properties. Next, the metal mesh plate 42 is inserted and installed in the middle of the pull-out frame 41. Then, the filter plate assembly 4 is inserted and installed in the positioning groove 111 of the square main shell 11 through the pull-out frame 41. The metal mesh plate 42 can be selected with different mesh sizes according to filtration requirements, such as 50 mesh, 100 mesh, etc. The pull-out frame 41 can be made of aluminum alloy, which is lightweight and high-strength. Finally, the rinsing assembly 5 is fixedly installed on the outer side of the square main shell 11 through the base plate 51, using bolts for fixation. The spray pipe assembly 54 is connected to an external rinsing water pump via a hose for rinsing use.

[0036] The equipment operates as follows: Wastewater inflow: Wastewater enters the inlet cover group 3 through the central pipe 32, and then is diverted through the diversion mesh group 22 of the diversion inner cover 2, and evenly enters the filter plate group 4.

[0037] Filtration process: Wastewater is filtered in the multi-layer filter plate group 4. The metal mesh plate 42 intercepts impurities in the wastewater, and the filtered water is discharged through the drain bottom shell 12.

[0038] Cleaning process: Periodically pull out the filter plate assembly 4 and insert it into the concave clamp 52 for rinsing. During rinsing, the external water pump delivers the cleaning solution to the horizontal spray pipe 542 through the liquid supply pipe assembly 543. The drive cylinder 55 drives the vertical frame 541 to move up and down on the vertical track 532. The horizontal spray pipe 542 rinses the filter plate assembly 4 and washes away the impurities on the filter plate assembly 4. If the filtration performance of the filter plate assembly 4 is seriously reduced, the pull-out frame 41 can be pulled out from the positioning groove 111 and the metal mesh plate 42 can be replaced.

[0039] The above are preferred embodiments of this utility model. Those skilled in the art can make changes and modifications to the above embodiments. Therefore, this utility model is not limited to the specific embodiments described above. Any obvious improvements, substitutions or modifications made by those skilled in the art based on this utility model shall fall within the protection scope of this utility model.

Claims

1. A multi-layer filter box assembly for wastewater treatment, comprising a multi-layer box assembly (1), characterized in that: The multi-layer box assembly (1) includes a square main shell (11) and a drain bottom shell (12). The drain bottom shell (12) is installed on the lower end face of the square main shell (11) and is sealed to the square main shell (11). A diversion inner cover (2) is installed on the upper end face of the square main shell (11). The diversion inner cover (2) is detachably and fixedly connected to the square main shell (11). An inlet cover assembly (3) is provided above the diversion inner cover (2). The inlet cover assembly (3) is sealed to the square main shell (11). Several sets of removable filter plate assemblies (4) are arranged from top to bottom in the diversion inner cover (2). A rinsing assembly (5) for cleaning the filter plate assembly (4) is also fixedly installed on the outer side of the square main shell (11).

2. The multi-layer filter box assembly for wastewater treatment according to claim 1, characterized in that: The diversion inner cover (2) includes a main frame shell (21) and a diversion mesh group (22). The main frame shell (21) is inserted into the square main shell (11), and the diversion mesh group (22) is fixedly installed on the upper end face of the main frame shell (21).

3. A multi-layer filter box assembly for wastewater treatment according to claim 2, characterized in that: The main frame shell (21) is provided with connecting ear plates (211) on both sides. The connecting ear plates (211) are integrally formed with the main frame shell (21), and several connecting holes are provided on the connecting ear plates (211).

4. A multi-layer filter box assembly for wastewater treatment according to claim 2, characterized in that: The diversion mesh group (22) includes a central column (221) and an inclined mesh (222). The central column (221) is located at the center of the main frame (21). The inclined mesh (222) is evenly installed on the outer surface of the central column (221), and the lower end of the inclined mesh (222) is fixedly connected to the main frame (21).

5. A multi-layer filter box assembly for wastewater treatment according to claim 4, characterized in that: The liquid inlet cover assembly (3) includes a cover shell (31) and a central tube (32). The central tube (32) is vertically installed at the center of the upper end face of the cover shell (31) and is fixedly connected to the cover shell (31).

6. A multi-layer filter box assembly for wastewater treatment according to claim 5, characterized in that: The filter plate assembly (4) includes a pull-out frame (41) and a metal mesh plate (42). The metal mesh plate (42) is inserted and installed in the middle of the pull-out frame (41). The front end face of the square main shell (11) is provided with a number of positioning grooves (111) for the pull-out frame (41) to be installed.

7. A multi-layer filter box assembly for wastewater treatment according to claim 6, characterized in that: The rinsing assembly (5) includes a seat plate (51), a concave clamp plate (52), a guide seat (53), and a spray pipe assembly (54). The seat plate (51) is fixedly installed on the outer side of the square main shell (11). The concave clamp plate (52) is fixedly installed on both ends of the seat plate (51). The guide seat (53) is fixedly installed on the lower end of the concave clamp plate (52). The spray pipe assembly (54) is slidably installed on the guide seat (53). A drive cylinder (55) for driving the spray pipe assembly (54) to move up and down is also installed on the guide seat (53).

8. A multi-layer filter box assembly for wastewater treatment according to claim 7, characterized in that: The guide seat (53) includes a connecting base plate (531) and a vertical rail (532) for sliding installation of the spray pipe assembly (54), the vertical rail (532) being vertically fixed to the upper surface of the connecting base plate (531).

9. A multi-layer filter box assembly for wastewater treatment according to claim 8, characterized in that: The spray pipe assembly (54) includes a vertical frame (541), several horizontal spray pipes (542) and a liquid supply pipe assembly (543). The vertical frame (541) is slidably installed on a vertical track (532). The horizontal spray pipes (542) are evenly fixed on the vertical frame (541) from top to bottom. The lower end face of the liquid supply pipe assembly (543) is connected to an external water pump, and the head of the liquid supply pipe assembly (543) is connected to several horizontal spray pipes (542) respectively.

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