A wastewater treatment device with multi-stage filtration function

Abstract

This invention relates to the field of wastewater treatment equipment technology, specifically disclosing a wastewater treatment device with multi-stage filtration function. The device includes a housing, from left to right, comprising a filtration tank, a storage tank, an aeration tank, a secondary sedimentation tank, and a clear water tank. A central plate is vertically fixed in the middle of the aeration tank. Two movable parts are symmetrically slidably mounted on the top of the aeration tank, symmetrically positioned on either side of the central plate. Channels connecting the aeration tank to the storage tank and the secondary sedimentation tank are located on both sides of the aeration tank. The bottoms of the two movable parts can respectively block the two channel openings. A pressure control mechanism is located above each of the two movable parts. The aeration tank is equipped with an exhaust mechanism, and the top of the filtration tank is equipped with a pneumatic stirring mechanism matched to the exhaust mechanism. This invention effectively utilizes the gas during aeration to achieve liquid inlet and outlet operations in the aeration tank, as well as internal stirring in the filtration tank. The overall performance is stable and reliable, with high efficiency.

Description

Technical Field

[0001] This invention relates to the field of wastewater treatment equipment technology, and in particular to a wastewater treatment equipment with multi-stage filtration function. Background Technology

[0002] Multi-stage filtration wastewater treatment equipment is a common type of equipment used for wastewater treatment. This includes underground wastewater treatment equipment, which is widely used in the field of wastewater treatment. It combines multiple wastewater treatment units and related equipment to achieve centralized treatment of wastewater.

[0003] Existing multi-stage filtration wastewater treatment systems have some shortcomings. Multiple pools often require multiple submersible pumps. These pumps are used to transfer liquid between pools. They operate frequently and for extended periods, which significantly impacts their lifespan and energy consumption. Furthermore, when a single pump fails, the entire system malfunctions, affecting overall efficiency.

[0004] Therefore, in order to solve such problems, we propose a wastewater treatment device with multi-stage filtration function. Summary of the Invention

[0005] The purpose of this invention is to address the shortcomings of existing technologies by proposing a wastewater treatment device with multi-stage filtration capabilities.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] A wastewater treatment device with multi-stage filtration function includes a device housing. The device housing is provided with a filtration tank, a storage tank, an aeration tank, a secondary sedimentation tank, and a clear water tank from left to right. A middle plate is vertically fixed in the middle of the aeration tank, and there is a gap between the middle plate and the bottom of the aeration tank. Two aeration discs are symmetrically installed at the bottom of the aeration tank and are symmetrically arranged on both sides of the middle plate. Two movable parts are symmetrically slidably installed on the top of the aeration tank and are symmetrically arranged on both sides of the middle plate. Channels communicating with the storage tank and the secondary sedimentation tank are provided on both sides of the aeration tank. The bottom of the two movable parts can block the two channel openings respectively. A pressure control mechanism is provided above the two movable parts.

[0008] The aeration tank is equipped with an exhaust mechanism, and the top of the filtration tank is equipped with a pneumatic stirring mechanism that matches the exhaust mechanism.

[0009] Preferably, both aeration discs are connected to an external blower via pipes that pass through the equipment housing and are equipped with on / off valves.

[0010] Preferably, the movable part has an inverted U-shaped cross section, and the movable part is provided with skirt blocks on the front and rear sides. The four sides of the movable part are respectively slidably sealed and fitted with the aeration tank and the intermediate plate.

[0011] Preferably, a gap is provided between the top of the movable part and the top of the aeration tank, and several springs are provided in the gap, and the top of the movable part is fixedly connected to the top of the aeration tank through several springs.

[0012] Preferably, the pneumatic control mechanism includes an electric telescopic rod horizontally fixed to the top of the movable part, a push plate fixed to the telescopic end of the electric telescopic rod, the push plate being slidably connected to the top of the movable part, a round hole on the push plate, a through hole on the top of the movable part that can be aligned with the round hole, a slot for the equipment housing that is matched with the push plate for insertion and positioning, the cross-sectional area of ​​the slot being larger than the cross-sectional area of ​​the push plate, and a valve mechanism for connecting both sides being horizontally installed on the top of the middle plate.

[0013] Preferably, the air valve mechanism includes a circular tube connecting both sides of the intermediate plate, a motor is vertically fixed in the middle of the circular tube, the rotating shaft of the motor faces downward and a disc block is coaxially fixed thereon, a one-way valve is horizontally fixed on the disc block, the circular tube is provided with a cavity that matches the disc block, and the disc block and the cavity slide and seal together.

[0014] Preferably, the exhaust mechanism includes two electromagnetic double-way valves fixedly installed on the top of the aeration tank. The two electromagnetic double-way valves are respectively installed on the top of two movable parts. The two electromagnetic double-way valves are used to control the connection to the inside of the equipment box. The ends of the two electromagnetic double-way valves located outside the equipment box are fixedly connected to an exhaust pipe.

[0015] Preferably, the pneumatic stirring mechanism includes a disc cavity fixedly mounted on the top of the filter tank, a multi-blade fan rotatably mounted on the top of the disc cavity, an exhaust pipe fixed to the side of the disc cavity and communicating with its interior, a stirring rod coaxially fixed at the bottom of the multi-blade fan, the stirring rod passing through the top of the filter tank and extending to the middle of the filter tank, a rotating component fixed on the top of the multi-blade fan, the rotating component extending to the outside of the disc cavity, and an air outlet pipe aligned with the exhaust pipe fixed on the side of the disc cavity.

[0016] Preferably, the top of the filtration tank, the storage tank, the secondary sedimentation tank, and the clear water tank are all equipped with exhaust valves. A bent channel is provided between the filtration tank and the storage tank, and a grid is installed obliquely on the bent channel. An inclined plate is fixed inside the storage tank, with the lower end of the inclined plate close to the right side of the storage tank and having a gap between it and the side wall of the storage tank. A filter layer is detachably fixed between the secondary sedimentation tank and the clear water tank.

[0017] Preferably, the bottom of the filtration tank, storage tank, aeration tank and secondary sedimentation tank are all provided with V-shaped grooves, and the end faces of the V-shaped grooves are connected to sludge discharge pipes.

[0018] Compared with the prior art, the beneficial effects of the present invention are:

[0019] 1. In this invention, by setting up an aeration tank and installing movable parts, an intermediate plate, and a gas pressure control mechanism inside the aeration tank, the liquid inlet and outlet operations of the aeration tank can be realized in conjunction with the gas during aeration. There is no need to set up a separate submersible pump. The operation is stable and reliable, and the equipment cost and energy cost are effectively reduced.

[0020] 2: By setting up an exhaust mechanism and a pneumatic stirring mechanism that matches the exhaust mechanism, the internal stirring of the filter tank can be achieved through the excess airflow discharged by the aeration while aeration is being realized, which effectively improves the working efficiency. Attached Figure Description

[0021] Figure 1 This is an isometric view of the present invention;

[0022] Figure 2 This is a schematic diagram of the internal structure of the present invention;

[0023] Figure 3 This is a schematic diagram of the pneumatic stirring mechanism of the present invention;

[0024] Figure 4 This is a schematic diagram of the aeration tank of the present invention;

[0025] Figure 5 This is a schematic diagram of the structure of the movable component of the present invention;

[0026] Figure 6 This is a schematic diagram of the push plate sealing through hole structure of the present invention;

[0027] Figure 7 This is a schematic diagram of the structure of the circular hole aligned with the through hole of the present invention;

[0028] Figure 8 This is a schematic diagram of the structure of the present invention after the push plate is fully inserted into the slot;

[0029] Figure 9 This is a schematic diagram of the air valve mechanism of the present invention.

[0030] In the diagram: 1. Equipment housing; 2. Filter tank; 3. Storage tank; 4. Aeration tank; 5. Secondary sedimentation tank; 6. Clear water tank; 7. Intermediate plate; 8. Aeration disc; 9. Moving parts; 10. Channel opening; 11. Skirt block; 12. Spring; 13. Electric telescopic rod; 14. Push plate; 15. Round hole; 16. Through hole; 17. Slot; 18. Air valve mechanism; 19. Electromagnetic double-way valve; 20. Exhaust pipe; 21. Disc cavity; 22. Multi-blade fan; 23. Stirring rod; 24. Rotating parts; 25. Air outlet pipe; 26. Bending channel; 27. Grille; 28. Filter layer; 29. ​​V-groove; 30. Sludge discharge pipe; 31. Inclined plate; 32. Wastewater inlet / outlet; 33. Clear water outlet; 34. Round pipe; 35. Motor; 36. One-way valve; 37. Disc block. Detailed Implementation

[0031] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0032] Reference Figure 1-9 A wastewater treatment device with multi-stage filtration function includes a housing 1, which can be a rectangular box with an internal cavity. The housing 1 can be buried underground, effectively reducing space occupation; if this is not possible, the housing 1 can also be used above ground. From left to right, the housing 1 includes a filtration tank 2, a storage tank 3, an aeration tank 4, a secondary sedimentation tank 5, and a clear water tank 6. The filtration tank 2 has a wastewater inlet 32 ​​at the top, and the clear water tank 6 has a clear water outlet 33 at the bottom. A middle plate 7 is vertically fixed in the middle of the aeration tank 4, with a gap between the middle plate 7 and the bottom of the aeration tank 4, dividing the aeration tank 4 in the middle, making the aeration tank 4 resemble a U-shaped tank. Two aeration discs 8 are symmetrically installed at the bottom of the aeration tank 4, and are symmetrically arranged on both sides of the middle plate 7. Two movable parts 9 are symmetrically slidably installed at the top of the aeration tank 4, and are symmetrically arranged on both sides of the middle plate 7. Channel openings 10 connecting to the liquid storage tank 3 and the secondary sedimentation tank 5 are respectively provided on both sides of the aeration tank 4. The channel openings 10 are located in an appropriate position, slightly above the center. The bottoms of the two movable parts 9 can respectively block the two channel openings 10, and each of the two movable parts 9 is equipped with a pressure control mechanism.

[0033] The aeration tank 4 is equipped with an exhaust mechanism, and the top of the filter tank 2 is equipped with a pneumatic stirring mechanism that matches the exhaust mechanism.

[0034] As a technical optimization of this invention, both aeration discs 8 are connected to an external blower via pipes that penetrate the equipment housing 1 and are equipped with on / off valves. That is, a blower is located outside the equipment housing 1, supplying air to the two aeration discs 8. The aeration of the two aeration discs 8 can be flexibly controlled via the on / off valves on their corresponding pipes; that is, both aeration discs 8 can aerate simultaneously, or one can aerate individually. Aeration is a biological treatment process that decomposes pollutants such as organic matter, ammonia, and nitrogen in wastewater under aerobic conditions. By continuously aerating the wastewater, the growth environment of microorganisms in the wastewater is altered, thereby accelerating the treatment of wastewater by microorganisms.

[0035] As a technical optimization of the present invention, the movable part 9 has an inverted U-shaped cross section, and the movable part 9 is provided with skirt blocks 11 on the front and rear sides. The four sides of the movable part 9 are respectively slidably sealed and fitted with the aeration tank 4 and the intermediate plate 7, and the skirt blocks 11 can ensure an effective sealing effect.

[0036] As a technical optimization of the present invention, a gap is provided between the top of the movable part 9 and the top of the aeration tank 4, and a plurality of springs 12 are provided in the gap. The top of the movable part 9 is fixedly connected to the top of the aeration tank 4 by the plurality of springs 12. The plurality of springs 12 serve to connect the corresponding movable parts 9 and limit the up and down sliding of the movable parts 9 to a certain extent.

[0037] As a technical optimization of the present invention, the pneumatic control mechanism includes an electric telescopic rod 13 horizontally fixed to the top of the movable part 9. A push plate 14 is fixed to the telescopic end of the electric telescopic rod 13. The push plate 14 is slidably connected to the top of the movable part 9, ensuring good airtightness and preventing air leakage when the parts are in contact. The push plate 14 has a circular hole 15, and the top of the movable part 9 has a through hole 16 that aligns with the circular hole 15. The equipment housing 1 has a slot 17 that matches the insertion and positioning of the push plate 14. The cross-sectional area of ​​the slot 17 is larger than that of the push plate 14, making it easier for the push plate 14 to be inserted into the slot 17. The push plate 14 has three modes: the first mode is that the push plate 14 is not inserted into the slot 17 and the through hole 16 is blocked, in which case the through hole 16 is not ventilated; the second mode is that the push plate 14 is not fully inserted into the slot 17 and the round hole 15 is aligned with the through hole 16, in which case the through hole 16 is ventilated; the third mode is that the push plate 14 is fully inserted into the slot 17 and the through hole 16 is blocked again, in which case the through hole 16 is not ventilated. A valve mechanism 18 capable of connecting both sides is horizontally mounted on the top of the intermediate plate 7.

[0038] As an optimized technical solution of the present invention, the valve mechanism 18 includes a circular tube 34 connecting the two sides of the intermediate plate 7. A motor 35 is vertically fixed in the middle of the circular tube 34. The rotating shaft of the motor 35 faces downward and is coaxially fixed with a disc block 37. A one-way valve 36 is horizontally fixed on the disc block 37. The circular tube 34 is provided with a cavity that matches the disc block 37, and the disc block 37 slides and seals against the cavity. The motor 35 is used to control the rotation of the disc block 37, thereby aligning the one-way valve 36 with the two sides of the intermediate plate 7. The motor 35 can control the rotation of the disc block 37 and the corresponding one-way valve 36 to three states: one is one-way airflow from the left side of the intermediate plate 7 to the right side, one is one-way airflow from the right side of the intermediate plate 7 to the left side, and one is the disc block 37 blocking the circular tube 34.

[0039] As a technical optimization of the present invention, the exhaust mechanism includes two electromagnetic double-way valves 19 fixedly installed on the top of the aeration tank 4, which can be controlled to open and close. The two electromagnetic double-way valves 19 are respectively disposed on the tops of two movable parts 9. The two electromagnetic double-way valves 19 are used to control the connection to the inside of the equipment housing 1. One end of each electromagnetic double-way valve 19 located outside the equipment housing 1 is fixedly connected to an exhaust pipe 20. That is, the exhaust pipe 20 branches into two branch pipes, each fixedly connected to one of the two electromagnetic double-way valves 19.

[0040] As an optimized technical solution of the present invention, the pneumatic stirring mechanism includes a disc cavity 21 fixedly mounted on the top of the filter tank 2. A multi-blade fan 22 is rotatably mounted on the top of the disc cavity 21. An exhaust pipe 20 is fixed to the side of the disc cavity 21 and communicates with its interior. A stirring rod 23 is coaxially fixed to the bottom of the multi-blade fan 22. The stirring rod 23 passes through the top of the filter tank 2 and extends to the middle of the filter tank 2. A rotating component 24 is fixed to the top of the multi-blade fan 22 and extends to the outside of the disc cavity 21. An air outlet pipe 25 aligned with the exhaust pipe 20 is fixed to the side of the disc cavity 21. Air enters through the exhaust pipe 20 and exits through the air outlet pipe 25. The airflow drives the multi-blade fan 22 to rotate, which in turn drives the stirring rod 23 to rotate, enabling the stirring rod 23 to perform stirring operations. Simultaneously, the rotating component 24 also rotates. The speed of rotation of the rotating component 24 can be used to determine the stirring resistance inside the filter tank 2.

[0041] As a technical optimization of this invention, vent valves are provided at the top of the filter tank 2, storage tank 3, secondary sedimentation tank 5, and clear water tank 6. These vent valves are used to balance the air pressure within the filter tank 2, storage tank 3, secondary sedimentation tank 5, and clear water tank 6. The vent valves are one-way, preventing external air from entering. A bent channel 26 is provided between the filter tank 2 and the storage tank 3, which can block floating debris on the water surface. A grid mesh 27 is installed obliquely on the bent channel 26, which can prevent floating debris from entering the storage tank 3 when the liquid level is low. An inclined plate 31 is fixed inside the storage tank 3. The lower end of the inclined plate 31 is close to the right side of the storage tank 3 and has a gap between it and the side wall of the storage tank 3. The inclined plate 31 and the corresponding gap reduce the entry of oil from the water surface into the aeration tank 4. A filter layer 28 is detachably fixed between the secondary sedimentation tank 5 and the clear water tank 6. The filter layer 28 is an activated carbon layer or a sand and gravel layer, which can achieve a filtering effect.

[0042] As an optimized technical solution of the present invention, the bottom of the filtration tank 2, the storage tank 3, the aeration tank 4, and the secondary sedimentation tank 5 are all equipped with V-shaped grooves 29, and the end faces of the V-shaped grooves 29 are connected to sludge discharge pipes 30. The V-shaped grooves 29 are used to settle solids in the sewage, and the sludge discharge pipes 30 are used to discharge sludge, which can be used in conjunction with external suction equipment for sewage discharge. In addition, all the tanks are equipped with level sensors at the top for feedback of the liquid level, which facilitates the control of the liquid level.

[0043] In use, wastewater enters filter tank 2 through wastewater inlet 32 ​​at the top of filter tank 2. After being filtered by the bar screen 27, it enters the storage tank 3. The organic matter in the wastewater inside filter tank 2 and storage tank 3 is in an anaerobic environment. Under certain temperature, humidity, and pH conditions, it undergoes microbial fermentation, and the generated gas is discharged from the exhaust valve at the top. The liquid then sequentially enters aeration tank 4 for aeration and secondary sedimentation tank 5 for secondary filtration and sedimentation. Chemicals such as alum can be added to the secondary sedimentation tank 5 to assist sedimentation. Finally, it is filtered through filter layer 28 and enters clear water tank 6, and then discharged from clear water outlet 33, completing the recycling or discharge and achieving the effect of multi-stage treatment.

[0044] When the wastewater is in the aeration tank 4, it can be aerated. The blower equipment outside the equipment box 1 supplies air to the two aeration discs 8. Aeration provides an oxygen environment inside the aeration tank 4, and completes the biological treatment of pollutants such as organic matter, ammonia, and nitrogen in the wastewater under aerobic conditions. By continuously aerating the wastewater, the growth environment of microorganisms in the wastewater is changed, thereby accelerating the treatment of wastewater by microorganisms. During normal aeration, the electric telescopic rods 13 corresponding to the two movable parts 9 control the push plate 14 to not fully insert into the slot 17, aligning the round hole 15 with the through hole 16. At this time, the through hole 16 is ventilated, and the movable parts 9 are restricted by the slot 17 and cannot move. Simultaneously, the two electromagnetic double-way valves 19 open, and the airflow enters the exhaust pipe 20 through the through hole 16. The exhaust pipe 20 receives air, and the exhaust pipe 25 discharges air. The airflow drives the multi-blade fan 22 inside the disc cavity 21 to rotate. The rotation of the multi-blade fan 22 in turn drives the stirring rod 23 to rotate. The stirring rod 23 can perform stirring operations in the filter tank 2, crushing larger objects in the filter tank 2 for better biodegradation. At the same time, the corresponding rotating part 24 also rotates. The speed of rotation of the rotating part 24 can be used to judge the stirring resistance inside the filter tank 2. At this time, the operator can judge whether suction cleaning is needed by the rotation speed. For example, if the rotating part 24 rotates slowly for a long time, it indicates that there are more solid objects, and suction cleaning can be performed.

[0045] In this invention, the filtration tank 2 and the storage tank 3 are integrated and isolated from the aeration tank 4. Their biological reactions do not affect each other, and they can independently purify the environment for extended periods. Furthermore, the inlet and outlet operations of the aeration tank 4 do not require a separate submersible pump. The specific inlet operation is as follows: During inlet operation of the aeration tank 4, the push plates 14 at the top of the two movable parts 9 are not inserted into the corresponding slots 17, and the through holes 16 are blocked. The aeration disc 8 on the left side of the aeration tank 4 aerates, while the aeration disc 8 on the right side stops aeration. Both top electromagnetic double-way valves 19 are closed. Then, as the gas level on the left side of the aeration tank 4 increases at the top, the movable part 9 on the left side is lifted and moves upward, causing the liquid level on the left side to drop. Simultaneously, the motor 35 controls the rotation of the disc block 37 and the corresponding one-way valve 36, allowing one-way airflow from the left side of the intermediate plate 7 to the right. At this time, the gas at the top of the left side of the aeration tank 4 is forced in through the one-way valve 36. On the right side, the movable part 9 on the right side descends, and the incoming gas will not flow back. When the movable part 9 on the left side moves to expose the channel opening 10, the motor 35 controls the disc block 37 and the corresponding one-way valve 36 to rotate again, so that the disc block 37 blocks the circular pipe 34. At this time, due to the pressure, the movable part 9 on the left side is sucked by the gas at the top and remains stationary. Since the channel opening 10 is exposed, the liquid in the filter tank 2 that exceeds the channel opening 10 enters the aeration tank 4, achieving the liquid inlet effect. The gas in the aeration tank 4 is discharged from the exhaust valve at the top of the inclined plate 31 of the filter tank 2, which will not have a significant impact on the internal anaerobic environment.

[0046] The specific operation for draining the aeration tank 4 is as follows: During the draining operation, the two top electromagnetic double-way valves 19 are opened, and the push plate 14 on the left movable part 9 is fully inserted into the slot 17, blocking the through hole 16. At this time, the through hole 16 is not ventilated, and the left movable part 9 cannot move due to the restriction of the slot 17. Then, the push plate 14 on the right movable part 9 is not inserted into the corresponding slot 17 and the through hole 16 is blocked, allowing the right movable part 9 to move up and down. At this time, the aeration disc 8 on the left side of the aeration tank 4 aerates, while the aeration disc 8 on the right side stops aeration. As air accumulates on the left side, the air pressure squeezes the liquid to the right side of the aeration tank 4, lifting the right movable part 9 upwards, and the liquid level on the right side continuously rises until the right channel opening 10 is exposed. The liquid then enters the secondary sedimentation tank 5 from the channel opening 10, thus completing the draining operation of the aeration tank 4.

[0047] This device effectively utilizes the airflow of aeration, enabling both aeration and internal stirring of the filtration tank 2. It also allows for flexible control, facilitating the liquid inlet and outlet operations of the aeration tank 4. It eliminates the need for a separate submersible pump, ensuring stable and reliable operation while effectively reducing equipment and energy costs.

[0048] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A wastewater treatment device with multi-stage filtration function, comprising a device housing (1), characterized in that, The equipment box (1) is provided with a filter tank (2), a liquid storage tank (3), an aeration tank (4), a secondary sedimentation tank (5), and a clear water tank (6) from left to right. A middle plate (7) is vertically fixed in the middle of the aeration tank (4). There is a gap between the middle plate (7) and the bottom of the aeration tank (4). Two aeration discs (8) are symmetrically installed at the bottom of the aeration tank (4). The two aeration discs (8) are symmetrically arranged on both sides of the middle plate (7). Two movable parts (9) are symmetrically slidably installed on the top of the aeration tank (4). The two movable parts (9) are symmetrically arranged on both sides of the middle plate (7). The aeration tank (4) is provided with channel openings (10) on both sides that communicate with the liquid storage tank (3) and the secondary sedimentation tank (5). The bottom of the two movable parts (9) can block the two channel openings (10) respectively. A pressure control mechanism is provided above the two movable parts (9). The aeration tank (4) is equipped with an exhaust mechanism, and the top of the filter tank (2) is equipped with a pneumatic stirring mechanism that matches the exhaust mechanism. The movable part (9) has an inverted U-shaped cross section, and the movable part (9) has skirt blocks (11) on the front and rear sides. The movable part (9) is slidably sealed and fitted to the aeration tank (4) and the intermediate plate (7) on all four sides. A gap is provided between the top of the movable part (9) and the top of the aeration tank (4), and several springs (12) are provided in the gap. The top of the movable part (9) is fixedly connected to the top of the aeration tank (4) through several springs (12). The pneumatic control mechanism includes an electric telescopic rod (13) horizontally fixed to the top of the movable part (9). The telescopic end of the electric telescopic rod (13) is fixed with a push plate (14). The push plate (14) is slidably connected to the top of the movable part (9). The push plate (14) is provided with a round hole (15). The top of the movable part (9) is provided with a through hole (16) that can be aligned with the round hole (15). The equipment box (1) is provided with a slot (17) that matches the push plate (14) for insertion and positioning. The cross-sectional area of ​​the slot (17) is larger than the cross-sectional area of ​​the push plate (14). The top of the middle plate (7) is horizontally installed with a valve mechanism (18) that can connect the two sides.

2. The wastewater treatment equipment with multi-stage filtration function according to claim 1, characterized in that, Both aeration discs (8) are connected to an external blower via pipes. The pipes pass through the equipment housing (1) and are equipped with on / off valves.

3. A wastewater treatment device with multi-stage filtration function according to claim 1, characterized in that, The valve mechanism (18) includes a circular tube (34) connecting the two sides of the intermediate plate (7). A motor (35) is vertically fixed in the middle of the circular tube (34). The rotating shaft of the motor (35) faces downward and is coaxially fixed with a disc block (37). A one-way valve (36) is horizontally fixed on the disc block (37). The circular tube (34) is provided with a cavity that matches the disc block (37). The disc block (37) slides and seals against the cavity.

4. A wastewater treatment device with multi-stage filtration function according to claim 1, characterized in that, The exhaust mechanism includes two electromagnetic double-way valves (19) fixedly installed on the top of the aeration tank (4). The two electromagnetic double-way valves (19) are respectively set on the top of the two movable parts (9). The two electromagnetic double-way valves (19) are used to control the connection inside the equipment box (1). The two electromagnetic double-way valves (19) located outside the equipment box (1) are fixedly connected to an exhaust pipe (20).

5. A wastewater treatment device with multi-stage filtration function according to claim 4, characterized in that, The pneumatic stirring mechanism includes a disc cavity (21) fixedly set at the top of the filter tank (2), a multi-blade fan (22) rotatably mounted on the top of the disc cavity (21), an exhaust pipe (20) fixed to the side of the disc cavity (21) and communicating with its interior, a stirring rod (23) coaxially fixed at the bottom of the multi-blade fan (22), the stirring rod (23) passing through the top of the filter tank (2) and extending to the middle of the filter tank (2), a rotating part (24) fixed at the top of the multi-blade fan (22), the rotating part (24) extending to the outside of the disc cavity (21), and an air outlet pipe (25) aligned with the exhaust pipe (20) fixed on the side of the disc cavity (21).

6. A wastewater treatment device with multi-stage filtration function according to claim 1, characterized in that, The filter tank (2), the storage tank (3), the secondary sedimentation tank (5) and the clear water tank (6) are all equipped with exhaust valves at the top. A bent channel (26) is provided between the filter tank (2) and the storage tank (3). A grid mesh (27) is installed obliquely on the bent channel (26). An inclined plate (31) is fixed inside the storage tank (3). The lower end of the inclined plate (31) is close to the right side of the storage tank (3) and there is a gap between it and the side wall of the storage tank (3). A filter layer (28) is detachably fixed between the secondary sedimentation tank (5) and the clear water tank (6).

7. A wastewater treatment device with multi-stage filtration function according to claim 1, characterized in that, The bottom of the filter tank (2), the liquid storage tank (3), the aeration tank (4) and the secondary sedimentation tank (5) are all provided with V-shaped grooves (29), and the end faces of the V-shaped grooves (29) are connected to sludge discharge pipes (30).

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