Multi-section wastewater treatment equipment for photocatalytic degradation

Abstract

The invention provides multi-section wastewater treatment equipment for photocatalytic degradation, and belongs to the technical field of wastewater treatment. Comprising a pretreatment device, a photocatalysis device, a separation and recovery device and a post-treatment device. By arranging the filter cartridge, the deformation ring, the conical filter screen, the arc-shaped top plate, an elastic sheet and a baffle ring II, after wastewater flows in from the water inlet, the arc-shaped top plate effectively disperses water flow, impurities are prevented from directly impacting the top of the conical filter screen to cause decomposition, and meanwhile, the arc-shaped top plate and the conical filter screen are driven to move downwards, so that the deformation ring forms a buffer inclined plane to further absorb impact energy; the filtering precision is greatly improved through double buffering; the deformation ring is linked with the baffle ring II through the connecting rope II, when wastewater flows in, the discharge hole is closed, impurity circulation is prevented, wastewater visibility is improved, photocatalytic degradation is enhanced, when the wastewater stops flowing in, the elastic piece resets the deformation ring, the baffle ring II is driven to open the discharge hole so that impurities can be discharged along with the treated wastewater, and filtering precision and photocatalytic degradation efficiency are improved; stable and efficient operation of the system is guaranteed.

Description

Technical Field

[0001] The invention relates to the technical field of wastewater treatment, and in particular to a multi-stage wastewater treatment device for photocatalytic degradation. Background Art

[0002] Wastewater treatment by photocatalytic degradation is an advanced oxidation technology that uses photocatalysts to produce strong oxidants under light conditions to decompose organic pollutants in wastewater into harmless substances. Before treatment, the wastewater must first pass through a pretreatment device to remove suspended matter and large particle impurities in the wastewater, and then it can be catalytically degraded through a photocatalytic device. After treatment, the wastewater is passed into a separation and recovery device to separate the photocatalyst from the wastewater, and finally the wastewater is passed into a post-treatment device for neutralization, disinfection and other operations.

[0003] After searching, the Chinese patent with the authorization announcement number CN220887101U discloses a wastewater treatment device for photocatalytic degradation of organic pollutants, including a device body, a feed port and a catalyst port are opened on the side wall of the device body, a discharge port is opened at the bottom, a motor is installed on the top, a plurality of catalytic lamps are arranged above the inside, and a movable component is arranged inside, the movable component is used to circulate the wastewater in the device body, and the movable component is connected to the motor through a gear. When the device is treating wastewater, while the wastewater is circulating, the content of solid impurities in the wastewater above the device is reduced, the visibility of the wastewater is improved, and the efficiency of photocatalytic degradation of wastewater with organic pollutants is improved.

[0004] In the above patent, the content of solid impurities in the wastewater above the device is reduced by circulating the wastewater, improving the visibility of the wastewater, and thereby improving the efficiency of photocatalytic degradation of wastewater containing organic pollutants. However, the impurities are always mixed with the wastewater, and the improvement in the visibility of the wastewater is limited. There is a need for further optimization of the efficiency of photocatalytic degradation of wastewater containing organic pollutants. Therefore, the present application provides a multi-stage wastewater treatment equipment for photocatalytic degradation to meet the demand. Summary of the invention

[0005] The technical problem to be solved by the present invention is to provide a multi-stage wastewater treatment device for photocatalytic degradation to solve the problem that the improvement of wastewater visibility is limited and the efficiency of photocatalytic degradation of organic pollutant wastewater needs to be further optimized.

[0006] In order to solve the above technical problems, the present invention provides the following technical solutions: A multi-stage wastewater treatment equipment for photocatalytic degradation, comprising a pretreatment device, a photocatalytic device, a separation and recovery device and a post-treatment device, wherein the pretreatment device is connected to the photocatalytic device, the photocatalytic device is connected to the separation and recovery device, the separation and recovery device is connected to the post-treatment device, the photocatalytic device comprises a cylinder, a water inlet is arranged on the top of the cylinder, a water outlet is arranged on the bottom of the cylinder, a catalytic lamp is arranged inside the cylinder, a catalyst addition tube is fixedly penetrated on the surface of the cylinder, a discharge hole is opened near the top of the catalyst addition tube, and further comprises: A filter cartridge, wherein the filter cartridge is arranged inside the cartridge body, a connecting ring is fixed to the inner wall of the cartridge body, the connecting ring is fixedly sleeved on the surface of the filter cartridge, a deforming ring is fixed to the top of the filter cartridge, a conical filter screen is fixed to the top of the deforming ring, an arc-shaped top plate is fixed at the top opening of the conical filter screen, a catalytic lamp is embedded in the wall thickness of the filter cartridge, a plurality of discharge holes are opened on the surface of the filter cartridge near the bottom, a retaining ring 2 is slidably connected to the inner wall of the filter cartridge and located at the discharge hole, a connecting rope 2 is fixed to the inner wall of the retaining ring 2, the top of the connecting rope 2 is fixed to the inner wall of the deforming ring, and a plurality of spring pieces are fixed at the connection between the deforming ring and the inner wall of the filter cartridge; When wastewater enters from the water inlet, the wastewater drives the arc-shaped top plate and the conical filter to move downward, and the conical filter drives the deformation ring to be concave downward near the inner side. After the deformation ring is concave downward, the lowest point of the conical filter is higher than the highest point of the deformation ring. At the same time, the deformation ring can drive the second retaining ring to move downward through the second connecting rope. When the wastewater stops entering, the deformation ring is reset by the spring piece, and the conical filter and the arc-shaped top plate are driven to move upward. At the same time, the deformation ring drives the second retaining ring to move upward through the second connecting rope.

[0007] Preferably, three quarters of the catalytic lamp is located inside the filter cartridge, and one quarter of the catalytic lamp is located outside the filter cartridge.

[0008] Preferably, a sliding block is slidably connected in the discharge hole, and the sliding block is fixed on the outer peripheral surface of the second retaining ring.

[0009] Preferably, a second slope is provided at the bottom of the slider, and a first slope is provided at the bottom of the discharge hole. The inclination angles of the first slope and the second slope are the same. When wastewater enters, the second slope is attached to the first slope, and when no wastewater enters, the second slope is separated from the first slope.

[0010] Preferably, a slope three is provided on the top of the sliding block two, and the slope three is inclined in the opposite direction to the slope two.

[0011] Preferably, the connecting ring is arranged at an angle.

[0012] Preferably, a plurality of guide blocks are fixed to the inner wall of the connecting ring, and the plurality of guide blocks are arranged between two adjacent discharge holes, and guide surfaces with opposite inclination angles are formed on the tops of the guide blocks.

[0013] Preferably, a retaining ring is movably sleeved on the surface of the catalyst addition tube, the retaining ring is located at the discharge hole, a connecting rope is fixed on the surface of the retaining ring, the top of the connecting rope is fixed on the inner wall of the deformation ring, when wastewater enters the cylinder, the deformation ring drives the retaining ring to move downward through the connecting rope, and when the wastewater stops entering the cylinder, the deformation ring drives the retaining ring to move upward through the connecting rope.

[0014] Preferably, the top of the catalyst addition tube is arranged in a semicircular shape.

[0015] Preferably, the filter cartridge is concentrically arranged with the second retaining ring.

[0016] Compared with the prior art, the present invention has at least the following beneficial effects: In the above scheme, by arranging the filter cylinder, the deformation ring, the conical filter screen, the arc-shaped top plate, the spring piece and the second retaining ring, after the wastewater flows in from the water inlet, the arc-shaped top plate effectively disperses the water flow to prevent impurities from directly impacting the top of the conical filter screen and causing it to decompose, and at the same time drives the arc-shaped top plate and the conical filter screen to move downward, so that the deformation ring forms a buffer slope to further absorb the impact energy, and the double buffering greatly improves the filtration accuracy; the deformation ring is linked to the second retaining ring by connecting the second rope, and the discharge hole is closed when the wastewater flows in to prevent the circulation of impurities, improve the visibility of the wastewater, and enhance the efficiency of photocatalytic degradation. When the wastewater stops flowing in, the spring piece resets the deformation ring, and drives the second retaining ring to open the discharge hole so that the impurities can be discharged with the treated wastewater, thereby improving the filtration accuracy and the photocatalytic degradation efficiency, and ensuring the stable and efficient operation of the system. At the same time, the depression of the deformation ring is reset, and the impurities remaining in the depression can be removed from the depression to avoid the accumulation of impurities.

[0017] By providing a slider, inclined plane 1, inclined plane 2 and inclined plane 3, the slider slides in the discharge hole to provide stable guidance for the retaining ring 2, ensuring its smooth lifting and lowering. Inclined plane 1 helps impurities to slide smoothly and prevents them from being retained at the bottom of the discharge hole. Its enlarged contact area with the slider enhances the sealing efficiency and prevents impurity leakage when the retaining ring 2 blocks the discharge hole. Inclined plane 3 further guides the impurities to fall and effectively avoids the accumulation of impurities on the top of the slider, thereby improving the operating stability and impurity treatment effect, reducing the risk of impurity residue and leakage, and ensuring the efficiency and purity of the wastewater treatment process.

[0018] By setting a connecting rope 1 and a retaining ring 1, when sewage enters the cylinder and causes the deformation ring to concave, the deformation ring drives the retaining ring to move down by the connecting rope 1 to open the discharge hole, ensuring that the catalyst is discharged smoothly to participate in sewage purification; and after the sewage stops entering the cylinder, the deformation ring moves up and drives the retaining ring 1 to rise and block the discharge hole, effectively preventing the residual wastewater in the cylinder from flowing back into the catalyst addition pipe to cause catalyst contamination, thereby ensuring the effectiveness and purity of the catalyst, and further improving the stability, reliability and treatment efficiency of the entire sewage treatment system. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The accompanying drawings, which constitute a part of the specification, illustrate embodiments of the present disclosure and, together with the description, further serve to explain the principles of the present disclosure and enable those skilled in the relevant art to make and use the present disclosure.

[0020] Figure 1 It is a schematic diagram of the overall three-dimensional structure of the present invention; Figure 2 It is a cross-sectional view of the cylinder of the present invention; Figure 3 This is a cross-sectional view of the catalyst adding tube of the present invention; Figure 4 This is an enlarged view of the conical filter screen of the present invention; Figure 5 It is a cross-sectional view of the filter cartridge of the present invention; Figure 6 For the present invention Figure 5 A magnified view of the structure at center; Figure 7 It is a schematic diagram of the three-dimensional structure of the filter cartridge of the present invention; Figure 8 This is a schematic diagram of a three-dimensional structure of an inclined surface of the present invention; Fig. 9 It is a schematic diagram of the three-dimensional structure of the slider of the present invention; Fig.10 It is a flow chart of the present invention.

[0021] [Reference Signs] 1. Pretreatment device; 2. Photocatalytic device; 3. Cylinder; 4. Water inlet; 5. Water outlet; 6. Catalyst addition tube; 7. Catalytic lamp; 8. Separation and recovery device; 9. Post-treatment device; 10. Connecting ring; 11. Filter cartridge; 12. Deformation ring; 13. Conical filter screen; 14. Arc top plate; 15. Shrapnel; 16. Discharge hole; 17. Connecting rope 1; 18. Retaining ring 1; 19. Discharge hole; 20. Retaining ring 2; 21. Connecting rope 2; 22. Inclined surface 1; 23. Sliding block; 24. Inclined surface 2; 25. Inclined surface 3; 26. Guide block; 27. Guide surface.

[0022] As shown in the figure, in order to clearly implement the structure of the embodiment of the present invention, specific structures and devices are marked in the figure, but this is only for illustrative purposes and is not intended to limit the present invention to the specific structure, device and environment. According to specific needs, ordinary technicians in this field can adjust or modify these devices and environments, and the adjustments or modifications made are still included in the scope of the attached claims. DETAILED DESCRIPTION

[0023] The following is a detailed description of a multi-stage wastewater treatment device for photocatalytic degradation provided by the present invention in conjunction with the accompanying drawings and specific embodiments. At the same time, it is explained here that in order to make the embodiments more detailed, the following embodiments are the best and preferred embodiments, and those skilled in the art may also adopt other alternative methods for some known technologies; and the accompanying drawings are only for a more specific description of the embodiments, and are not intended to specifically limit the present invention.

[0024] It should be noted that the references to "one embodiment", "embodiment", "exemplary embodiments", "some embodiments" and the like in the specification indicate that the embodiments described may include specific features, structures or characteristics, but not every embodiment may include the specific features, structures or characteristics. In addition, when a specific feature, structure or characteristic is described in conjunction with an embodiment, it should be within the knowledge of a person skilled in the art to implement such feature, structure or characteristic in conjunction with other embodiments (whether or not explicitly described).

[0025] In general, a term can be understood, at least in part, from its use in context. For example, depending, at least in part, on the context, the term "one or more" as used herein can be used to describe any feature, structure, or characteristic in the singular sense, or can be used to describe a combination of features, structures, or characteristics in the plural sense. Additionally, the term "based on" can be understood as not necessarily intended to convey an exclusive set of factors, but can instead, depending, at least in part, on the context, allow for the presence of other factors that are not necessarily explicitly described.

[0026] like Figure 1-Figure 10 As shown, an embodiment of the present invention provides a multi-stage wastewater treatment equipment for photocatalytic degradation, including a pretreatment device 1, a photocatalytic device 2, a separation and recovery device 8 and a post-treatment device 9, the pretreatment device 1 is connected to the photocatalytic device 2, the pretreatment device 1 performs preliminary treatment on the wastewater, removes large particles of suspended matter in the wastewater, some organic matter and adjusts the basic water quality indicators such as the pH value of the wastewater, the photocatalytic device 2 is connected to the separation and recovery device 8, the photocatalytic device 2 utilizes a photocatalytic reaction to degrade the difficult-to-degrade organic pollutants in the wastewater, the separation and recovery device 8 is connected to the post-treatment device 9, the separation and recovery device 8 is used to recover the catalyst in the wastewater, the post-treatment device 9 is used for neutralization and disinfection of the wastewater, etc., the photocatalytic device 2 includes a cylinder 3, a water inlet 4 is provided at the top of the cylinder 3, a water outlet 5 is provided at the bottom of the cylinder 3, a catalytic lamp 7 is provided inside the cylinder 3, a catalyst addition tube 6 is fixedly penetrated on the surface of the cylinder 3, and a discharge hole 16 is opened near the top of the catalyst addition tube 6, and also includes: A filter cartridge 11, the filter cartridge 11 is arranged inside the cylinder body 3, a connecting ring 10 is fixed to the inner wall of the cylinder body 3, the connecting ring 10 is fixedly sleeved on the surface of the filter cartridge 11, a deformable ring 12 is fixed to the top of the filter cartridge 11, a conical filter screen is fixed to the top of the deformable ring 12, an arc-shaped top plate 14 is fixed at the top opening of the conical filter screen, the catalytic lamp 7 is embedded in the wall thickness of the filter cartridge 11, a plurality of discharge holes 19 are opened on the surface of the filter cartridge 11 and near the bottom, a retaining ring 20 is slidably connected to the inner wall of the filter cartridge 11 and located at the discharge hole 19, a connecting rope 21 is fixed to the inner wall of the retaining ring 20, the top of the connecting rope 21 is fixed to the inner wall of the deformable ring 12, and a plurality of spring pieces 15 are fixed at the connection between the deformable ring 12 and the inner wall of the filter cartridge 11; When wastewater enters from the water inlet 4, the wastewater drives the arc-shaped top plate 14 and the conical filter screen 13 to move downward, and the conical filter screen 13 drives the deformation ring 12 to be concave downward near the inner side. After the deformation ring 12 is concave downward, the lowest point of the conical filter screen 13 is higher than the highest point of the deformation ring 12. At the same time, the deformation ring 12 can drive the retaining ring 20 to move downward through the connecting rope 21. When the wastewater stops entering, the deformation ring 12 is reset by the spring piece 15. After the deformation ring 12 is reset, the impurities accumulated in the depression can be discharged to avoid the accumulation of impurities, and at the same time, the conical filter screen 13 and the arc-shaped top plate 14 are driven to move upward. At the same time, the deformation ring 12 drives the retaining ring 20 to move upward through the connecting rope 21.

[0027] like Figure 5 As shown, in this embodiment, three quarters of the catalytic lamp 7 is located in the filter cartridge 11. Since most of the wastewater is located in the filter cartridge 11, three quarters of the light of the catalytic lamp 7 is irradiated on the filter cartridge 11, and the catalytic effect is better. One quarter of the catalytic lamp 7 is located outside the filter cartridge 11. There is relatively little wastewater between the filter cartridge 11 and the cylinder body 3, and one quarter of the catalytic lamp 7 can meet the demand.

[0028] like Figure 6 As shown, in this embodiment, a slider 23 is slidably connected in the discharge hole 19, and the slider 23 is fixed to the outer peripheral surface of the retaining ring 20. The slider 23 can move in the vertical direction inside the discharge hole 19, and the slider 23 can guide the retaining ring 20.

[0029] like Figure 6-Figure 8As shown, in this embodiment, a second slope 24 is provided at the bottom of the slider 23, and a first slope 22 is provided at the bottom of the discharge hole 19. The inclination angles of the first slope 22 and the second slope 24 are the same. When wastewater enters, the second slope 24 is attached to the first slope 22. When no wastewater enters, the second slope 24 is separated from the first slope 22. The first slope 22 can guide the impurities so that the impurities are smoothly discharged from the discharge hole 19 to avoid the accumulation of impurities at the bottom of the discharge hole 19. At the same time, the setting of the first slope 22 and the second slope 24 increases the contact area between the slider 23 and the discharge hole 19, increases the blocking effect, and avoids the outflow of impurities during blocking.

[0030] like Fig. 9 As shown, in this embodiment, a third slope 25 is provided on the top of the second slider 23 , and the inclination direction of the third slope 25 is opposite to that of the second slope 24 . The third slope 25 can guide impurities to prevent them from accumulating on the top of the slider 23 .

[0031] like Figure 6 As shown, in this embodiment, the connecting ring 10 is arranged tilted, and the tilted connecting ring 10 can guide the impurities so that the impurities can be discharged smoothly from the discharge hole 19 to avoid the impurities from accumulating on the connecting ring 10.

[0032] like Figure 7 and Figure 8 As shown, in this embodiment, a plurality of guide blocks 26 are fixed to the inner wall of the connecting ring 10, and the plurality of guide blocks 26 are arranged between two adjacent discharge holes 19. A guide surface 27 with an opposite inclination angle is provided on the top of the guide block 26. When the wastewater flows in the cylinder body 3, the guide block 26 can divert and guide the water flow, so that the wastewater is more evenly distributed around the filter cartridge 11, avoiding the local water flow being too fast or too slow and affecting the filtering effect. At the same time, the inclination angle design of the guide surface 27 helps to guide the impurities to move near the discharge hole 19, so that the impurities can be discharged more smoothly when the discharge hole 19 is opened, further improving the discharge efficiency of the impurities, reducing the residual impurities in the filter cartridge 11, ensuring the continuous and stable filtering performance of the filter cartridge 11, and improving the treatment effect and reliability of the entire wastewater treatment equipment.

[0033] like Figure 3As shown, in this embodiment, a retaining ring 18 is movably sleeved on the surface of the catalyst addition tube 6, and the retaining ring 18 is located at the discharge hole 16. A connecting rope 17 is fixed on the surface of the retaining ring, and the top of the connecting rope 17 is fixed to the inner wall of the deformation ring 12. When wastewater enters the cylinder 3, the deformation ring 12 drives the retaining ring 18 to move downward through the connecting rope 17. When the wastewater stops entering the cylinder 3, the deformation ring 12 drives the retaining ring 18 to move upward through the connecting rope 17. When sewage enters the cylinder 3 and causes the deformation ring 12 to be concave, the deformation ring 12 drives the retaining ring 18 to move downward by the connecting rope 17 to open the discharge hole 16. This linkage mechanism ensures that the catalyst can be added to the wastewater. When entering the cylinder 3, it is discharged smoothly and participates in the sewage purification process, ensuring the timely supply of catalysts required for the photocatalytic reaction and maintaining the efficient progress of the photocatalytic reaction. When the sewage stops entering the cylinder 3, the deformation ring 12 moves up and drives the retaining ring 18 to rise and block the discharge hole 16, effectively preventing the residual wastewater in the cylinder from flowing back into the catalyst addition pipe 6 to cause catalyst contamination. This design ensures the effectiveness and purity of the catalyst, avoids the reduction of its activity or failure due to catalyst contamination, thereby further improving the stability, reliability and treatment efficiency of the entire sewage treatment system, and ensuring that the wastewater treatment equipment can operate stably for a long time and maintain good treatment effects.

[0034] like Figure 3 As shown, in this embodiment, the top of the catalyst addition tube 6 is arranged in a semicircular shape. The semicircular shape can reduce the obstruction of the water flow and avoid the formation of turbulence or splashing after the water flow hits, so that the wastewater can enter the filter cartridge 11 more smoothly.

[0035] like Figure 3 As shown, in the present embodiment, the filter cartridge 11 and the retaining ring 20 are concentrically arranged. The concentric arrangement enables the retaining ring 20 to be subjected to relatively uniform force in the circumferential direction around the filter cartridge 11 when subjected to external forces such as the pulling force of the connecting rope 21 and the pressure of the wastewater, thereby avoiding damage to the connection structure between the retaining ring 20 and the filter cartridge 11 due to excessive force on one side due to uneven force, or causing the retaining ring 20 to become stuck or skewed during movement, thereby ensuring that the retaining ring 20 can move up and down smoothly with the movement of the deformation ring 12, thereby ensuring that the entire filtering and impurity discharge related mechanisms can operate stably and reliably, which is helpful to maintain the wastewater treatment equipment in good working condition for a long time and improve the overall stability and durability of the equipment.

[0036] Working principle: wastewater enters the cylinder 3 from the water inlet 4, and first impacts the arc-shaped top plate 14. The arc-shaped top plate 14 disperses the water flow to prevent the wastewater from directly impacting the top of the conical filter 13 and causing the decomposition of larger impurities. At the same time, the wastewater drives the arc-shaped top plate 14 and the conical filter 13 to move downward, and the conical filter 13 drives the deformation ring 12 to be concave downward near the inner side. After the deformation ring 12 is concave, it can form an outward and upward inclined surface. When the wastewater impacts the inclined surface, it can further reduce the impact energy of the water flow. At this time, the lowest point of the conical filter 13 is higher than the highest point of the deformation ring 12. After the wastewater is dispersed from the arc-shaped top plate 14, it flows through the conical filter 13. The impurities in the wastewater can be filtered out through the conical filter 13, and the impurities flow along the conical filter. The inclined surface of 13 flows downward, and the wastewater passes through the conical filter screen 13 and flows into the filter cartridge 11, wherein the deformable ring 12 moves downward, and at the same time drives the connecting rope 17 to move downward. After the connecting rope 17 moves downward, the retaining ring 18 moves downward. After the retaining ring 18 moves downward, the discharge hole 16 is opened, and the catalyst is introduced from the catalyst addition pipe 6 at this time. The catalyst can be discharged from the discharge hole 16 and dissolved with the wastewater. At the same time, when the deformable ring 12 is concave downward, the deformable ring 12 drives the retaining ring 20 to move downward through the connecting rope 21, and the retaining ring 20 blocks the discharge hole 19, so that the impurities stay between the filter cartridge 11 and the cylinder body 3, preventing the impurities from circulating with the wastewater, improving the visibility of the wastewater, and facilitating the subsequent photocatalytic degradation; The wastewater is in the cylinder 3, and the catalytic lamp 7 located in the filter cylinder 11 is turned on to perform a photocatalytic degradation reaction; After the wastewater stops entering the cylinder 3, the spring piece 15 resets the deformable ring 12, the depression produced by the deformable ring 12 disappears, and the impurities remaining in the depression can flow downward to avoid the accumulation of impurities. At the same time, the deformable ring 12 drives the conical filter 13 and the arc-shaped top plate 14 to move upward, and at the same time, the deformable ring 12 drives the baffle ring 20 to move upward through the connecting rope 21, and the discharge hole 19 is opened, and the impurities can be discharged together with the wastewater after the photocatalytic degradation is completed. At this time, the deformable ring 12 drives the baffle ring 18 to move upward through the connecting rope 17, and the baffle ring 18 blocks the discharge hole 16 to prevent the wastewater staying in the cylinder 3 from entering the catalyst addition pipe 6 to contaminate the catalyst; The wastewater after photocatalytic degradation treatment enters the separation and recovery device 8 to separate the photocatalyst from the wastewater. The separated and recovered wastewater enters the post-treatment device 9 for further treatment, such as adjusting the pH value, disinfection and sterilization, etc., to meet the emission standards or reuse requirements.

[0037] The present invention encompasses any substitution, modification, equivalent method and scheme made on the essence and scope of the present invention. In order to make the public have a thorough understanding of the present invention, specific details are described in detail in the above preferred embodiments of the present invention, and those skilled in the art can fully understand the present invention without the description of these details.

[0038] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principle of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A multi-stage wastewater treatment device for photocatalytic degradation, comprising a pretreatment device (1), a photocatalytic device (2), a separation and recovery device (8) and a post-treatment device (9), wherein the pretreatment device (1) is connected to the photocatalytic device (2), the photocatalytic device (2) is connected to the separation and recovery device (8), and the separation and recovery device (8) is connected to the post-treatment device (9), the photocatalytic device (2) comprises a cylinder (3), a water inlet (4) is arranged at the top of the cylinder (3), a water outlet (5) is arranged at the bottom of the cylinder (3), a catalytic lamp (7) is arranged inside the cylinder (3), a catalyst addition tube (6) is fixedly penetrated through the surface of the cylinder (3), and a discharge hole (16) is opened near the top of the catalyst addition tube (6), characterized in that: Also includes: A filter cartridge (11), the filter cartridge (11) being arranged inside a cylinder body (3), a connecting ring (10) being fixed to the inner wall of the cylinder body (3), the connecting ring (10) being fixedly sleeved on the surface of the filter cartridge (11), a deformable ring (12) being fixed to the top of the filter cartridge (11), a conical filter screen being fixed to the top of the deformable ring (12), an arc-shaped top plate (14) being fixed to the top opening of the conical filter screen, and a catalytic lamp (7) being embedded in the wall of the filter cartridge (11). A plurality of discharge holes (19) are provided on the surface of the filter cartridge (11) and near the bottom thereof; a retaining ring (20) is slidably connected to the inner wall of the filter cartridge (11) and located at the discharge hole (19); a connecting rope (21) is fixed to the inner wall of the retaining ring (20); the top of the connecting rope (21) is fixed to the inner wall of the deformation ring (12); and a plurality of spring pieces (15) are fixed to the connection between the deformation ring (12) and the inner wall of the filter cartridge (11); When wastewater enters from the water inlet (4), the wastewater drives the arc-shaped top plate (14) and the conical filter (13) to move downward, and the conical filter (13) drives the deformation ring (12) to be depressed downward near the inner side. After the deformation ring (12) is depressed downward, the lowest point of the conical filter (13) is higher than the highest point of the deformation ring (12). At the same time, the deformation ring (12) can drive the second retaining ring (20) to move downward through the second connecting rope (21). When the wastewater stops entering, the deformation ring (12) is reset through the spring sheet (15), and the conical filter (13) and the arc-shaped top plate (14) are driven to move upward. At the same time, the deformation ring (12) drives the second retaining ring (20) to move upward through the second connecting rope (21).

2. The multi-stage wastewater treatment equipment for photocatalytic degradation according to claim 1, characterized in that: Three quarters of the catalytic lamp (7) is located inside the filter cartridge (11), and one quarter of the catalytic lamp (7) is located outside the filter cartridge (11).

3. The multi-stage wastewater treatment equipment for photocatalytic degradation according to claim 1, characterized in that: A sliding block (23) is slidably connected in the discharge hole (19), and the sliding block (23) is fixed on the outer peripheral surface of the second retaining ring (20).

4. The multi-stage wastewater treatment equipment for photocatalytic degradation according to claim 3 is characterized in that: The bottom of the slider (23) is provided with a second inclined surface (24), and the bottom of the discharge hole (19) is provided with a first inclined surface (22). The first inclined surface (22) and the second inclined surface (24) have the same inclination angle. When waste water enters, the second inclined surface (24) is attached to the first inclined surface (22), and when no waste water enters, the second inclined surface (24) is separated from the first inclined surface (22).

5. The multi-stage wastewater treatment equipment for photocatalytic degradation according to claim 3, characterized in that: The top of the second slide block (23) is provided with a third inclined surface (25), and the inclined surface (25) is inclined in the opposite direction to the second inclined surface (24).

6. The multi-stage wastewater treatment equipment for photocatalytic degradation according to claim 1, characterized in that: The connecting ring (10) is arranged tilted.

7. The multi-stage wastewater treatment equipment for photocatalytic degradation according to claim 1, characterized in that: A plurality of guide blocks (26) are fixed to the inner wall of the connecting ring (10), and the plurality of guide blocks (26) are arranged between two adjacent discharge holes (19). The top of the guide block (26) is provided with a guide surface (27) with an opposite inclination angle.

8. The multi-stage wastewater treatment equipment for photocatalytic degradation according to claim 1, characterized in that: A retaining ring (18) is movably sleeved on the surface of the catalyst addition tube (6). The retaining ring (18) is located at the discharge hole (16). A connecting rope (17) is fixed on the surface of the retaining ring. The top of the connecting rope (17) is fixed to the inner wall of the deformation ring (12). When wastewater enters the cylinder (3), the deformation ring (12) drives the retaining ring (18) to move downward through the connecting rope (17). When the wastewater stops entering the cylinder (3), the deformation ring (12) drives the retaining ring (18) to move upward through the connecting rope (17).

9. The multi-stage wastewater treatment equipment for photocatalytic degradation according to claim 1, characterized in that: The top of the catalyst addition tube (6) is arranged in a semicircular shape.

10. The multi-stage wastewater treatment equipment for photocatalytic degradation according to claim 1, characterized in that: The filter cartridge (11) is arranged concentrically with the second retaining ring (20).

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