A photocatalytic reaction device for the degradation treatment of concentrated brine in a multi-stage reverse osmosis process

Abstract

The present invention belongs to the technical field of photocatalytic reaction devices, and particularly relates to a photocatalytic reaction device for the degradation treatment of multi-stage reverse osmosis concentrated brine, including a hierarchical degradation tank and a photocatalytic reaction assembly; a partition filter screen, a first degradation plate, a second degradation plate and a third degradation plate are arranged in the hierarchical degradation tank; the concentrated brine in the water inlet pipe is subjected to hierarchical degradation by using the partition filter screen, the first degradation plate, the second degradation plate and the third degradation plate inside the hierarchical degradation tank. After switching the three-way valve, the three-way valve is communicated with the water inlet pipe. During the flow of the concentrated brine in the water inlet pipe, it sequentially passes through several groups of multi-stage reverse osmosis multi-stage filters, and the concentrated brine is subjected to multi-stage reverse osmosis. After the concentrated brine undergoes multi-stage reverse osmosis and degradation, it enters the photocatalytic reaction assembly through the water outlet pipe for the photocatalytic reaction of the treated concentrated brine, shortening the time of the photocatalytic reaction of the concentrated brine.

Description

Technical Field

[0001] The present invention belongs to the technical field of photocatalytic reaction devices, and particularly relates to a photocatalytic reaction device for the degradation treatment of multi-stage reverse osmosis concentrated brine. Background Art

[0002] Multi-stage reverse osmosis concentrated brine refers to the high-concentration waste liquid remaining after biochemical treatment, microfiltration, nanofiltration, ultrafiltration, and reverse osmosis treatment in the process of sewage treatment. It is characterized by high salt content, high organic matter content, and most of the organic matter therein are stable organic matters that cannot be oxidized and decomposed by biochemical reactions.

[0003] After retrieval, in the prior art, Chinese Patent Publication No. CN206980693U, Authorization Publication Date: February 9, 2018, discloses an efficient liquid-core optical fiber photocatalytic reactor, including: an ultraviolet light source, a light-transmitting optical fiber, an ultraviolet light-emitting surface, a liquid-core optical fiber bundle, and a reactor housing. Among them, the liquid-core optical fiber bundle is composed of multiple liquid-core optical fibers, and a titanium dioxide catalyst is coated on the inner wall of each liquid-core optical fiber. The liquid-core optical fiber bundle is fixed inside the reactor housing through a liquid-core optical fiber upper positioning frame and a liquid-core optical fiber lower positioning frame. The beneficial effect of this application is that the liquid-core optical fiber combines three functions of a catalyst carrier, an ultraviolet light transmission medium, and a catalytic oxidation micro-reaction channel. Therefore, the reactor of this application achieves the efficacy of efficiently degrading COD in multi-stage reverse osmosis concentrated brine by using the principle of photocatalytic oxidation.

[0004] However, this device still has the following defects: Although it can achieve the efficacy of efficiently degrading COD in multi-stage reverse osmosis concentrated brine, during the photocatalytic reaction of the concentrated brine, only ultraviolet light can enter the liquid-core optical fiber and be transmitted inside the liquid-core optical fiber through total reflection. The illumination range is fixed and blind spots are likely to appear, affecting the technological process of the photocatalytic reaction and increasing the duration of the process. Summary of the Invention

[0005] In view of the above problems, the present invention provides a photocatalytic reaction device for the degradation treatment of multi-stage reverse osmosis concentrated brine, including a hierarchical degradation tank and a photocatalytic reaction assembly; a partition filter screen, a first degradation plate, a second degradation plate, and a third degradation plate are arranged in the hierarchical degradation tank. The photocatalytic reaction assembly is located on one side of the hierarchical degradation tank and close to the third degradation plate. A three-way valve is arranged at a position on one side of the hierarchical degradation tank and close to the partition filter screen. A recovery pipe is communicated between one end of the three-way valve and the photocatalytic reaction assembly, and a water inlet pipe is communicated between the other end of the three-way valve and the hierarchical degradation tank. A plurality of groups of multi-stage reverse osmosis multi-stage filter elements are arranged at the bottom of the water inlet pipe. An outlet pipe is also communicated between one side of the photocatalytic reaction assembly and the hierarchical degradation tank.

[0006] During the flow of concentrated brine in the inlet pipe, it successively passes through several groups of multi-stage reverse osmosis multi-stage filter elements, which play the role of multi-stage reverse osmosis on the concentrated brine. After multi-stage reverse osmosis and degradation of the concentrated brine, it enters the photocatalytic reaction component through the outlet pipe for the photocatalytic reaction of the treated concentrated brine.

[0007] Furthermore, the photocatalytic reaction component includes a recovery cylinder and a reaction cylinder; the outer side wall of the recovery cylinder is respectively provided with a first through hole, a second through hole and a third through hole. The reaction cylinder is clamped inside the recovery cylinder, and a gap is reserved at the connection between the recovery cylinder and the reaction cylinder.

[0008] Furthermore, a fourth through hole is provided on one outer wall of the reaction cylinder. The fourth through hole and the second through hole are distributed at both ends of the outlet pipe. A reaction mechanism is arranged inside the reaction cylinder, and a four-way valve is arranged at the bottom of the reaction cylinder.

[0009] Furthermore, one side of the four-way valve is communicated with a recovery pipe, and the recovery pipe penetrates through the third through hole. The other side of the four-way valve is provided with a tap water pipe, and the tap water pipe penetrates through the first through hole. The end of the tap water pipe extends to the outside of the recovery cylinder, and a booster pump is arranged on the tap water pipe.

[0010] Furthermore, the reaction mechanism includes a limit cover plate; a limit pin column is rotatably connected to the center of the axis of the limit cover plate. A multi-faceted hole is provided at the bottom of the limit pin column. A rotating ring is arranged on the inner wall of the limit cover plate, and two groups of micro motors are rotatably connected to the rotating ring. The output ends of the two groups of micro motors are drivingly connected with lead screws.

[0011] Furthermore, two groups of linkage blocks are threadedly connected to the lead screws, and one ends of the two groups of linkage blocks are both slidably and fittingly connected to the bottom of the limit cover plate. A servo motor is fixedly connected to the top of the limit cover plate, and the output end of the servo motor is drivingly connected to the top end of the limit pin column. Linkage parts are arranged at the bottoms of the two groups of linkage blocks. A cleaning part penetrates through the center of the axis of the linkage part. The bottom end of the cleaning part is rotatably connected to the top of the four-way valve, and the top end of the cleaning part is movably clamped in the multi-faceted hole.

[0012] Furthermore, the linkage part includes a spiral stirring rod; a spiral lamp tube is arranged inside the spiral stirring rod. A linkage arm is arranged inside the spiral lamp tube, and a reserved hole is provided at the center of the axis of the linkage arm.

[0013] Furthermore, fastening rings are arranged at both ends of the linkage arm, and the two groups of fastening rings are both fixedly connected to the outside of the spiral stirring rod and the spiral lamp tube.

[0014] Further, two groups of guiding and adjusting grooves are formed in the outer wall of the linkage arm, and the two groups of guiding and adjusting grooves are symmetrically arranged with the central axis of the reserved hole as the center. Bar-shaped lamp tubes are slidably connected in the two groups of guiding and adjusting grooves, and the tops of the two bar-shaped lamp tubes are fixedly connected to the bottom of the linkage block.

[0015] Further, the cleaning part includes a cleaning pipe; the bottom end of the cleaning pipe is rotatably connected to the top of the four-way valve. A plurality of groups of overflow holes are formed in the outer wall of the cleaning pipe. An electric push rod is fixedly connected to the top of the cleaning pipe, and the output end of the electric push rod is drivingly connected to a multi-prism, and the multi-prism is movably clamped in the multi-sided hole.

[0016] The beneficial effects of the present invention are as follows:

[0017] 1. Through the stepped degradation tank, the concentrated brine in the water inlet pipe is subjected to stepped degradation by using the internal partition filter screen, the first degradation plate, the second degradation plate and the third degradation plate. After switching the three-way valve, the three-way valve is communicated with the water inlet pipe. During the flow of the concentrated brine in the water inlet pipe, it sequentially passes through a plurality of groups of multi-stage reverse osmosis multi-stage filter elements, and the concentrated brine is subjected to multi-stage reverse osmosis. After multi-stage reverse osmosis and degradation of the concentrated brine, it enters the photocatalytic reaction assembly through the water outlet pipe for the photocatalytic reaction of the treated concentrated brine, shortening the time of the photocatalytic reaction of the concentrated brine.

[0018] 2. Through the continuous operation of the spiral lamp tube and the bar-shaped lamp tube, the concentrated brine entering the reaction cylinder is subjected to photocatalytic reaction, and the rotation of the output end of the micro motor drives the two bar-shaped lamp tubes to move to different positions in the guiding and adjusting grooves, reducing the blind area of the photocatalytic reaction of the concentrated brine in the reaction cylinder and improving the range of the photocatalytic reaction.

[0019] 3. Since the spiral lamp tube and the spiral stirring rod have the same spiral radial direction, stirring can be carried out during the photocatalytic reaction of the concentrated brine by the spiral stirring rod, making the photocatalytic reaction of the concentrated brine more uniform.

[0020] 4. Tap water is injected into the cleaning pipe in the form of high pressure and overflows outward through a plurality of groups of overflow holes in different directions. The output end of the servo motor continuously drives the linkage part to rotate, so that the high-pressure tap water in the overflow holes flushes the rotating linkage part, removing the concentrated brine on the surface of the linkage part, reducing the corrosion of the linkage part and improving the service life of the linkage part.

[0021] Other features and advantages of the present invention will be described in the following specification, and, in part, will be obvious from the specification, or will be understood by implementing the present invention. The objectives and other advantages of the present invention can be realized and obtained by the structures pointed out in the specification, the claims and the drawings. Description of the Drawings

[0022] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0023] Figure 1 Shows the structural schematic diagram of the photocatalytic reaction device according to the embodiment of the present invention;

[0024] Figure 2 Shows the structural schematic of the photocatalytic reaction component according to the embodiment of the present invention Figure 1 ;

[0025] Figure 3 Shows the structural schematic of the photocatalytic reaction component according to the embodiment of the present invention Figure 2 ;

[0026] Figure 4 Shows the connection schematic diagram of the reaction cylinder and the four-way valve according to the embodiment of the present invention;

[0027] Figure 5 Shows the structural schematic diagram of the reaction mechanism according to the embodiment of the present invention;

[0028] Figure 6 Shows the structural schematic of the limit cover plate according to the embodiment of the present invention Figure 1 ;

[0029] Figure 7 Shows the structural schematic of the limit cover plate according to the embodiment of the present invention Figure 2 ;

[0030] Figure 8 Shows the structural schematic diagram of the linkage part according to the embodiment of the present invention;

[0031] Figure 9 Shows the structural schematic diagram of the linkage arm according to the embodiment of the present invention;

[0032] Figure 10 Shows the structural schematic diagram of the cleaning part according to the embodiment of the present invention.

[0033] In the figure: 1. Gradual degradation tank; 2. Isolation filter; 3. First degradation plate; 4. Second degradation plate; 5. Third degradation plate; 6. Photocatalytic reaction component; 61. Recovery cylinder; 62. First through hole; 63. Second through hole; 64. Reaction cylinder; 65. Third through hole; 66. Fourth through hole; 67. Four-way valve; 68. Reaction mechanism; 681. Limiting cover; 682. Linkage part; 6821. Spiral stirring rod; 6822. Spiral lamp; 6823. Linkage arm; 6824. Reserved hole; 6825. Fastening ring; 6826, guide adjustment groove; 6827, strip light tube; 683, cleaning unit; 6831, cleaning tube; 6832, overflow hole; 6833, electric push rod; 6834, polygonal column; 684, limit pin; 685, polygonal hole; 686, swivel; 687, micro motor; 688, screw rod; 689, linkage block; 6810, servo motor; 69, tap water pipe; 7, recovery pipe; 8, water inlet pipe; 9, multi-stage reverse osmosis multi-stage filter element; 10, three-way valve; 11, water outlet pipe. DETAILED DESCRIPTION

[0034] To make the objectives, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts shall fall within the scope of protection of the present invention.

[0035] The embodiment of the present invention provides a photocatalytic reaction device for multi-stage reverse osmosis concentrated brine degradation treatment, including a graded degradation tank 1 and a photocatalytic reaction component 6; for example, Figure 1 shown.

[0036] The graded degradation pool 1 is provided with a barrier filter 2, a first degradation plate 3, a second degradation plate 4 and a third degradation plate 5. The photocatalytic reaction component 6 is located on one side of the graded degradation pool 1 and close to the third degradation plate 5. A three-way valve 10 is provided on one side of the graded degradation pool 1 and close to the barrier filter 2. A recovery pipe 7 is connected between one end of the three-way valve 10 and the photocatalytic reaction component 6, and a water inlet pipe 8 is connected between the other end of the three-way valve 10 and the graded degradation pool 1. Several groups of multi-stage reverse osmosis multi-stage filter elements 9 are provided at the bottom of the water inlet pipe 8. A water outlet pipe 11 is also connected between one side of the photocatalytic reaction component 6 and the graded degradation pool 1.

[0037] Specifically, the graded degradation pool 1 utilizes the internal barrier filter 2, the first degradation plate 3, the second degradation plate 4 and the third degradation plate 5 to perform graded degradation on the concentrated brine in the water inlet pipe 8, and after switching the three-way valve 10, the three-way valve 10 is connected to the water inlet pipe 8. During the flow of concentrated brine in the water inlet pipe 8, it passes through several groups of multi-stage reverse osmosis multi-stage filter elements 9 in sequence, performing multi-stage reverse osmosis on the concentrated brine, so that the concentrated brine enters the photocatalytic reaction component 6 through the outlet pipe 11 after multi-stage reverse osmosis and degradation, and is used for the photocatalytic reaction of the concentrated brine after treatment.

[0038] The photocatalytic reaction assembly 6 includes a recovery cylinder 61 and a reaction cylinder 64; for example, Figure 2 、 Figure 3 and Figure 4 shown.

[0039] The outer side walls of the recovery cylinder 61 are respectively provided with a first through hole 62, a second through hole 63 and a third through hole 65. The reaction cylinder 64 is clamped inside the recovery cylinder 61, and a gap is reserved at the connection between the recovery cylinder 61 and the reaction cylinder 64. A fourth through hole 66 is provided on one side of the outer wall of the reaction cylinder 64. The fourth through hole 66 and the second through hole 63 are distributed at both ends of the water outlet pipe 11. A reaction mechanism 68 is provided inside the reaction cylinder 64. A four-way valve 67 is provided at the bottom of the reaction cylinder 64. One side of the four-way valve 67 is communicated with the recovery pipe 7, and the recovery pipe 7 passes through the third through hole 65.

[0040] A water pipe 69 is provided on the other side of the four-way valve 67 , and the water pipe 69 passes through the first through hole 62 . The end of the water pipe 69 extends to the outside of the recovery cylinder 61 , and a booster pump is provided on the water pipe 69 .

[0041] Specifically, the outlet pipe 11 guides the concentrated brine after multi-stage reverse osmosis degradation through the fourth through hole 66 to the reaction cylinder 64, and utilizes the reaction mechanism 68 to perform a photocatalytic reaction on the concentrated brine in the reaction cylinder 64. By opening the four-way valve 67, the concentrated brine precipitated at the bottom of the reaction cylinder 64 is returned to the water inlet pipe 8 through the recovery pipe 7 for the purpose of multi-stage reverse osmosis degradation of the concentrated brine again. By opening the four-way valve 67, the tap water pipe 69 and the reaction cylinder 64 are interconnected. When the tap water pipe 69 is continuously injected with tap water, it is used in conjunction with the booster pump to rinse and clean the inner wall of the reaction cylinder 64 and the reaction mechanism 68.

[0042] The reaction mechanism 68 includes a limiting cover plate 681; illustratively, as Figure 5 、 Figure 6 and Figure 7 shown.

[0043] The center of the central axis of the limit cover 681 is rotatably connected to the limit pin 684, and the bottom of the limit pin 684 is provided with a multi-ribbed hole 685. The inner wall of the limit cover 681 is provided with a rotating ring 686, and the rotating ring 686 is rotatably connected to two groups of micro motors 687. The output ends of the two groups of micro motors 687 are transmission-connected with screw rods 688, and the screw rods 688 are threadedly connected to two groups of linkage blocks 689, and one end of the two groups of linkage blocks 689 are slidably fitted and connected to the limit. The bottom of the positioning cover plate 681, the top of the limiting cover plate 681 is fixedly connected to the servo motor 6810, and the output end of the servo motor 6810 is transmission-connected to the top of the limiting pin 684, and the bottoms of the two groups of linkage blocks 689 are each provided with a linkage part 682, and the center of the central axis of the linkage part 682 is penetrated by a cleaning part 683, the bottom end of the cleaning part 683 is rotatably connected to the top of the four-way valve 67, and the top of the cleaning part 683 is movably engaged in the multi-faceted hole 685.

[0044] The linkage part 682 includes a spiral stirring rod 6821; for example, Figure 8 and Figure 9 shown.

[0045] The inner wall of the spiral stirring rod 6821 is provided with a spiral lamp tube 6822, and the interior of the spiral lamp tube 6822 is provided with a linkage arm 6823, and a reserved hole 6824 is provided at the center of the central axis of the linkage arm 6823, and both ends of the linkage arm 6823 are provided with fastening rings 6825, and the two groups of fastening rings 6825 are fixedly connected to the outside of the spiral stirring rod 6821 and the spiral lamp tube 6822, and the outer wall of the linkage arm 6823 is also provided with two groups of guide adjustment grooves 6826, and the two groups of guide adjustment grooves 6826 are symmetrically arranged with the central axis of the reserved hole 6824 as the center, and the two groups of guide adjustment grooves 6826 are slidably connected with strip lamp tubes 6827, and the top ends of the two groups of strip lamp tubes 6827 are fixedly connected to the bottom of the linkage block 689.

[0046] The cleaning portion 683 includes a cleaning tube 6831; illustratively, as Figure 10 shown.

[0047] The bottom end of the cleaning tube 6831 is rotatably connected to the top of the four-way valve 67. The outer wall of the cleaning tube 6831 is provided with a plurality of overflow holes 6832. The top of the cleaning tube 6831 is fixedly connected to an electric push rod 6833, and the output end of the electric push rod 6833 is transmission-connected to a polygonal column 6834, and the polygonal column 6834 is movably engaged in the polygonal hole 685.

[0048] Specifically, the continuous operation of the spiral lamp tube 6822 and the strip lamp tube 6827 performs a photocatalytic reaction on the concentrated brine entering the reaction cylinder 64. By using the rotation of the output end of the micro motor 687, the two groups of strip lamp tubes 6827 are driven to move to different positions in the guiding adjustment groove 6826, which is used to reduce the blind area of the photocatalytic reaction of the concentrated brine in the reaction cylinder 64, thereby improving the range of the photocatalytic reaction. The spiral lamp tube 6822 has the same spiral radial direction as the spiral stirring rod 6821, and can stir during the photocatalytic reaction of the concentrated brine by the spiral stirring rod 6821, making the photocatalytic reaction of the concentrated brine more uniform;

[0049] The output end of the electric push rod 6833 drives the multi prism 6834 to fall, so that it is separated from the multi prism hole 685. During the process of injecting tap water into the tap water pipe 69, the booster pump is used to inject tap water into the cleaning pipe 6831 in a high-pressure form and overflow outward through a number of overflow holes 6832 in different directions. The output end of the servo motor 6810 continuously drives the linkage part 682 to rotate, so that the high-pressure tap water in the overflow holes 6832 flushes the rotating linkage part 682, removing the concentrated brine on the surface of the linkage part 682, reducing the corrosion of the linkage part 682, and improving the service life of the linkage part 682.

[0050] Using a photocatalytic reaction device for the degradation treatment of multi-stage reverse osmosis concentrated brine proposed in the embodiment of the present invention, its working principle is as follows:

[0051] Through the grading degradation tank 1, the concentrated brine in the water inlet pipe 8 is subjected to grading degradation by the internal partition filter screen 2, the first degradation plate 3, the second degradation plate 4 and the third degradation plate 5. After switching the three-way valve 10, the three-way valve 10 is communicated with the water inlet pipe 8. During the flow of the concentrated brine in the water inlet pipe 8, it sequentially passes through a number of multi-stage reverse osmosis multi-stage filter elements 9, and the concentrated brine is subjected to multi-stage reverse osmosis, so that the concentrated brine enters the photocatalytic reaction assembly 6 through the water outlet pipe 11 after multi-stage reverse osmosis and degradation;

[0052] The concentrated brine after multi-stage reverse osmosis degradation is guided through the fourth through hole 66 into the reaction cylinder 64 through the water outlet pipe 11. The reaction mechanism 68 is used to perform a photocatalytic reaction on the concentrated brine in the reaction cylinder 64. By opening the four-way valve 67, the concentrated brine deposited at the bottom of the reaction cylinder 64 flows back into the water inlet pipe 8 through the recovery pipe 7 for the purpose of re-multi-stage reverse osmosis degradation of the concentrated brine. By opening the four-way valve 67, the tap water pipe 69 is communicated with the reaction cylinder 64. When the tap water pipe 69 continuously injects tap water, it is used in conjunction with the booster pump to clean the inner wall of the reaction cylinder 64 and the reaction mechanism 68;

[0053] Through the continuous operation of the spiral lamp tube 6822 and the strip lamp tube 6827, a photocatalytic reaction is carried out on the concentrated brine entering the reaction cylinder 64. By using the rotation of the output end of the micro motor 687, the two groups of strip lamp tubes 6827 are driven to move to different positions in the guiding adjustment groove 6826, which is used to reduce the blind area of the photocatalytic reaction of the concentrated brine in the reaction cylinder 64, so as to improve the range of the photocatalytic reaction. The spiral lamp tube 6822 has the same spiral radial direction as the spiral stirring rod 6821, and can stir during the photocatalytic reaction of the concentrated brine by the spiral stirring rod 6821, making the photocatalytic reaction of the concentrated brine more uniform;

[0054] The output end of the electric push rod 6833 drives the multi prism 6834 to fall, so that it is separated from the multi prism hole 685. During the process of injecting tap water into the tap water pipe 69, the booster pump is used to inject tap water into the cleaning pipe 6831 in a high-pressure form and overflow outward through a number of overflow holes 6832 in different directions. The output end of the servo motor 6810 continuously drives the linkage part 682 to rotate, so that the high-pressure tap water in the overflow holes 6832 flushes the rotating linkage part 682, removing the concentrated brine on the surface of the linkage part 682, reducing the corrosion of the linkage part 682, and improving the service life of the linkage part 682.

[0055] Although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements for some of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A photocatalytic reaction device for the degradation treatment of multi-stage reverse osmosis concentrated brine, characterized in that: It includes a hierarchical degradation tank (1) and a photocatalytic reaction assembly (6); a partition filter screen (2), a first degradation plate (3), a second degradation plate (4) and a third degradation plate (5) are arranged in the hierarchical degradation tank (1), the photocatalytic reaction assembly (6) is located on one side of the hierarchical degradation tank (1) and close to the third degradation plate (5), a three-way valve (10) is arranged at a position on one side of the hierarchical degradation tank (1) and close to the partition filter screen (2), a recovery pipe (7) is communicated between one end of the three-way valve (10) and the photocatalytic reaction assembly (6), a water inlet pipe (8) is communicated between the other end of the three-way valve (10) and the hierarchical degradation tank (1), a plurality of groups of multi-stage reverse osmosis multi-stage filters (9) are arranged at the bottom of the water inlet pipe (8), and a water outlet pipe (11) is also communicated between one side of the photocatalytic reaction assembly (6) and the hierarchical degradation tank (1); During the flow of concentrated brine in the water inlet pipe, it successively passes through a plurality of groups of multi-stage reverse osmosis multi-stage filters to perform multi-stage reverse osmosis on the concentrated brine, so that the concentrated brine undergoes multi-stage reverse osmosis and degradation and then enters the photocatalytic reaction assembly through the water outlet pipe for photocatalytic reaction of the treated concentrated brine; The photocatalytic reaction assembly (6) includes a recovery cylinder (61) and a reaction cylinder (64); first through holes (62), second through holes (63) and third through holes (65) are respectively formed in the outer side wall of the recovery cylinder (61), the reaction cylinder (64) is clamped inside the recovery cylinder (61), and a gap is reserved at the connection between the recovery cylinder (61) and the reaction cylinder (64); A fourth through hole (66) is formed in the outer wall of one side of the reaction cylinder (64), the fourth through hole (66) and the second through hole (63) are distributed at both ends of the water outlet pipe (11), a reaction mechanism (68) is arranged inside the reaction cylinder (64), and a four-way valve (67) is arranged at the bottom of the reaction cylinder (64); The reaction mechanism (68) includes a limit cover plate (681); a limit pin column (684) is rotatably connected to the center of the axis of the limit cover plate (681), a multi-faceted hole (685) is formed at the bottom of the limit pin column (684), a rotating ring (686) is arranged on the inner wall of the limit cover plate (681), and two sets of micro motors (687) are rotatably connected to the rotating ring (686), and the output ends of the two sets of micro motors (687) are drivingly connected with lead screws (688); Two sets of linkage blocks (689) are threadedly connected to the lead screw (688), and one end of each of the two sets of linkage blocks (689) is slidably and fittingly connected to the bottom of the limit cover plate (681). A servo motor (6810) is fixedly connected to the top of the limit cover plate (681), and the output end of the servo motor (6810) is drivingly connected to the top end of the limit pin (684). Linkage parts (682) are provided at the bottoms of the two sets of linkage blocks (689), and a cleaning part (683) is connected through the center of the axis of the linkage part (682). The bottom end of the cleaning part (683) is rotatably connected to the top of the four-way valve (67), and the top end of the cleaning part (683) is movably clamped in the multi-faceted hole (685). The linkage part (682) includes a spiral stirring rod (6821); a spiral lamp tube (6822) is provided on the inner wall of the spiral stirring rod (6821), a linkage arm (6823) is provided inside the spiral lamp tube (6822), and a reserved hole (6824) is opened at the center of the axis of the linkage arm (6823). Fastening rings (6825) are provided at both ends of the linkage arm (6823), and the two sets of fastening rings (6825) are fixedly connected to the exteriors of the spiral stirring rod (6821) and the spiral lamp tube (6822). Two guiding and adjusting grooves (6826) are further opened on the outer wall of the linkage arm (6823), and the two sets of guiding and adjusting grooves (6826) are symmetrically arranged with the axis of the reserved hole (6824) as the center. Strip-shaped lamp tubes (6827) are slidably connected in the two sets of guiding and adjusting grooves (6826), and the top ends of the two sets of strip-shaped lamp tubes (6827) are fixedly connected to the bottom of the linkage block (689).

2. The photocatalytic reaction device for degrading and treating multi-stage reverse osmosis concentrated brine according to claim 1, wherein: One side of the four-way valve (67) is communicated with the recovery pipe (7), and the recovery pipe (7) penetrates through the third through hole (65). The other side of the four-way valve (67) is provided with a tap water pipe (69), and the tap water pipe (69) penetrates through the first through hole (62). The end of the tap water pipe (69) extends to the outside of the recovery cylinder (61), and a booster pump is provided on the tap water pipe (69).

3. The photocatalytic reaction device for degrading and treating concentrated brine of multi-stage reverse osmosis according to claim 1, characterized in that: The cleaning part (683) includes a cleaning pipe (6831); the bottom end of the cleaning pipe (6831) is rotatably connected to the top of the four-way valve (67). A number of overflow holes (6832) are opened on the outer wall of the cleaning pipe (6831). An electric push rod (6833) is fixedly connected to the top of the cleaning pipe (6831), and the output end of the electric push rod (6833) is drivingly connected to a multi-faceted prism (6834), and the multi-faceted prism (6834) is movably clamped in the multi-faceted hole (685).

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