Photocatalytic reactor for wastewater treatment

Abstract

The invention relates to the technical field of wastewater treatment, in particular to a photocatalytic reactor for wastewater treatment, which comprises a reactor barrel body: the upper part of the barrel body is connected with a water inlet pipe, the lower part is connected with a water outlet pipe, the bottom is welded with a barrel body bracket, and the center position of a top barrel cover is rotatably provided with a paddle rotating shaft vertically extending downwards; more than two stirring blades are distributed on the paddle rotating shaft at equal intervals, and more than two photocatalytic lamp tubes which vertically extend downwards are distributed around the barrel cover in an annular array; more than one horizontally placed isolation plate is arranged in the reactor barrel body, the interior of the reactor barrel body is divided into a plurality of reaction units by the isolation plates, and each reaction unit is provided with a stirring blade. On the basis of a set of light source and a stirring device, the influence of non-uniform precipitation on the ultraviolet light penetration rate is solved by layering the space in the barrel, the hydraulic flow state is improved through the paddles, the photocatalytic reaction efficiency is improved in a compact volume environment, and the capacity of treating high-concentration and refractory organic wastewater is improved.

Description

Technical Field

[0001] The invention relates to the technical field of wastewater treatment, in particular to a photocatalytic reactor for wastewater treatment. Background Art

[0002] The treatment of high-concentration, difficult-to-degrade organic wastewater has become a major challenge in the field of environmental protection. This type of wastewater usually contains high concentrations of organic pollutants with complex and diverse components, and has the characteristics of strong toxicity and poor biodegradability. Traditional biological treatment processes are difficult to effectively degrade. Advanced oxidation technologies represented by H2O2 can produce highly oxidizing hydroxyl radicals through photocatalytic reactions, thereby achieving efficient degradation of organic pollutants. When ultraviolet light irradiates hydrogen peroxide H2O2, it causes it to decompose and produce hydroxyl radicals·OH. Hydroxyl radicals·OH have extremely strong oxidizing ability (redox potential 2.8V) and can indiscriminately attack the chemical bonds in organic pollutants and mineralize them into carbon dioxide, water and inorganic salts, but they still face many technical bottlenecks in practical applications.

[0003] First, high-concentration organic wastewater typically exhibits high turbidity and color, significantly reducing UV light penetration and severely impacting the photoexcitation efficiency of H₂O₂. This results in insufficient ·OH production, making it difficult to meet pollutant degradation requirements. Second, existing UV / H₂O₂ reaction equipment often utilizes large medium- and low-pressure UV lamp systems, which suffer from uneven UV radiation distribution, poor hydraulic flow patterns, and insufficient effective reaction dose, resulting in low treatment efficiency. Furthermore, conventional equipment generally suffers from drawbacks such as bulk, high energy consumption, and complex operation and maintenance, limiting its widespread application in practical projects.

[0004] Therefore, there is an urgent need for a new type of small, compact photocatalytic reactor that can treat high-concentration, difficult-to-degrade organic wastewater and provide an effective solution to the shortcomings of existing technologies. Summary of the Invention

[0005] The object of the present invention is to provide a photocatalytic reactor for wastewater treatment to solve the problems raised in the above background technology.

[0006] To achieve the above object, the present invention provides the following technical solutions:

[0007] A photocatalytic reactor for wastewater treatment, characterized in that it includes a reactor barrel: the upper portion of the reactor barrel is connected to a water inlet pipe, the lower portion is connected to a water outlet pipe, the bottom portion is welded to a barrel bracket, and the top portion is installed with a barrel cover; a paddle shaft extending vertically downward is rotatably mounted at the center of the barrel cover, two or more stirring blades are evenly distributed on the paddle shaft, the paddle shaft is driven by a drive motor fixedly mounted on the barrel cover, and two or more photocatalytic lamps extending vertically downward are distributed in a circular array around the barrel cover; at least one horizontally placed isolation plate is provided in the reactor barrel, the isolation plate separates the reactor barrel into a plurality of equal-height and non-connected reaction units, each reaction unit is provided with a stirring blade at the center position, a water distribution pipe extending vertically downward is provided at one end of the water inlet pipe extending into the barrel, the water distribution pipe is provided with water distribution ports corresponding to the reaction units one by one, and the isolation plate is provided with an axial hole, a pipe hole, and a lamp hole, the axial hole, the pipe hole, and the lamp hole being respectively used to avoid the paddle shaft, the photocatalytic lamp, and the water distribution pipe.

[0008] Furthermore, a water collector is provided at the bottom of the reactor barrel, and filter membrane columns extending vertically upward are distributed in a circular array on the water collector. The filter membrane columns pass through the membrane column holes preset on the isolation plate and are evenly distributed in each reaction unit. The end of the outlet pipe extending into the barrel is connected to the water collector.

[0009] Furthermore, a backwash drain pipe is connected to the center of the bottom of the reactor barrel, and a water hole is provided at the center of the water collector.

[0010] Furthermore, an axle seat is fixedly installed at the center position of the bottom of the reactor barrel, and lamp holders are distributed in a circular array around it; the lower end of the blade shaft is rotatably installed in the axle seat, and the lower end of the photocatalytic lamp tube is inserted into the lamp holder; grooves are distributed in a circular array on the edge of the water collector, and the grooves are used to avoid the lamp holder; a bracket is provided at the bottom of the water hole, and the axle seat is installed on the bracket.

[0011] Furthermore, the isolation plate and the reactor barrel are both made of opaque materials.

[0012] Furthermore, the upper and lower surfaces of the isolation plate and the inner surface of the reactor barrel are provided with a reflective coating.

[0013] Furthermore, a hydrogen peroxide delivery pipe is arranged outside the water inlet pipe, and the hydrogen peroxide delivery pipe is provided with delivery ports corresponding one to one with the reaction units.

[0014] Compared with the prior art, the present invention has the following beneficial effects:

[0015] 1. The application separates multiple reaction units of the same height and not connected by setting isolation plates in the reactor barrel, reduces the influence of uneven precipitation of wastewater in a single reaction unit on the penetration rate of ultraviolet light, enables ultraviolet light to irradiate hydrogen peroxide more effectively, improves the photoexcitation efficiency of hydrogen peroxide, increases the amount of ·OH generated, and thus meets the degradation needs of pollutants; a stirring vane is arranged at the center of each reaction unit, the rotation of the stirring vane forms a good hydraulic flow state of wastewater in the reaction unit, and the wastewater is fully mixed with hydrogen peroxide and the generated hydroxyl radical ·OH, improving the uniformity and effectiveness of the reaction and solving the problem of poor hydraulic flow state of traditional equipment. The application solves the influence of uneven precipitation on the penetration rate of ultraviolet light by layering the space in the barrel based on a set of light sources and stirring devices, improves the photocatalytic reaction efficiency in a compact volume environment by improving the hydraulic flow state through the paddle, and improves the ability to treat high-concentration and difficult-to-degrade organic wastewater.

[0016] 2. The application also integrates a filter membrane column in the photocatalytic reactor to remove suspended solids, macromolecular organic matter and other impurities in the wastewater, improve the water quality, and periodically clean the filter membrane column through backwashing and sewage discharge function, prolong the service life, reduce the operation cost and maintenance frequency. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 It is an appearance view of a photocatalytic reactor for wastewater treatment;

[0018] Figure 2 It is a structural schematic view of the reactor barrel, barrel cover and installation components on the barrel cover;

[0019] Figure 3 It is a structural schematic view of the internal structure of the reactor barrel;

[0020] Figure 4 It is an exploded view of the internal structure of the reactor barrel;

[0021] Figure 5 It is a structural schematic view of the barrel cover, the paddle shaft, stirring vane, photocatalytic lamp installed thereon;

[0022] Figure 6 It is a structural schematic view of the water outlet pipe, backwashing and sewage discharge pipe, filter membrane column and water collector;

[0023] Figure 7 It is a structural schematic view of the filter membrane column and water collector;

[0024] Figure 8 It is a structural schematic view of the isolation plate;

[0025] Figure 9 It is a structural schematic view of the water distribution pipe.

[0026] In the figure: 1. Reactor barrel; 2. Barrel bracket; 3. Water inlet pipe; 4. Water outlet pipe; 5. Backwash drain pipe; 6. Barrel cover; 7. Drive motor; 8. Paddle shaft; 9. Stirring blade; 10. Photocatalytic lamp; 11. Filter membrane column; 12. Water collector; 13. Groove; 14. Water hole; 15. Lamp holder; 16. Shaft seat; 17. Isolation plate; 18. Membrane column hole; 19. Lamp tube hole; 20. Shaft hole; 21. Water distribution pipe; 22. Water distribution port; 23. Pipe hole. DETAILED DESCRIPTION

[0027] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. 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 are within the scope of protection of the present invention.

[0028] Example 1: Please refer to Figures 1 to 9 A photocatalytic reactor for wastewater treatment is characterized in that it includes a reactor barrel 1: the upper part of the reactor barrel 1 is connected to a water inlet pipe 3, the lower part is connected to a water outlet pipe 4, the bottom is welded with a barrel bracket 2, and the top is installed with a barrel cover 6; a blade shaft 8 extending vertically downward is rotatably installed at the center of the barrel cover 6, and two or more stirring blades 9 are evenly distributed on the blade shaft 8. The blade shaft 8 is driven by a drive motor 7 fixedly installed on the barrel cover 6, and two or more photocatalytic lamps 10 extending vertically downward are distributed in a ring array around the barrel cover 6; the reactor barrel There is one or more horizontally placed isolation plates 17 in the body 1, and the isolation plates 17 separate the reactor barrel body 1 into multiple reaction units of equal height and non-connected. A stirring blade 9 is provided at the center of each reaction unit. The end of the water inlet pipe 3 extending into the barrel is provided with a water distribution pipe 21 extending vertically downward. The water distribution pipe 21 is provided with water distribution ports 22 corresponding to the reaction units one by one. The isolation plate 17 is provided with an axial hole 20, a tube hole 23 and a lamp tube hole 19. The axial hole 20, the tube hole 23 and the lamp tube hole 19 are respectively used to avoid the blade shaft 8, the photocatalytic lamp tube 10 and the water distribution pipe 21.

[0029] The isolation plate 17 and the reactor barrel 1 are both made of opaque material.

[0030] The upper and lower surfaces of the isolation plate 17 and the inner surface of the reactor barrel 1 are provided with a reflective coating.

[0031] A hydrogen peroxide delivery pipe is arranged outside the water inlet pipe 3, and the hydrogen peroxide delivery pipe is provided with delivery ports corresponding to the reaction units one by one.

[0032] Working principle of this embodiment:

[0033] Filtered wastewater enters the reactor barrel 1 through the water inlet pipe 3. Simultaneously, hydrogen peroxide enters the reactor through a hydrogen peroxide delivery pipe juxtaposed to the outside of the water inlet pipe 3. The hydrogen peroxide delivery pipe is equipped with delivery ports corresponding to the reaction cells, ensuring uniform delivery of hydrogen peroxide to each reaction cell. A vertically downwardly extending water distribution pipe 21 is located at the end of the water inlet pipe 3 extending into the barrel. This water distribution pipe 21 is equipped with water distribution ports 22 corresponding to the reaction cells, allowing wastewater to be evenly distributed to each reaction cell through these ports. Two or more vertically downwardly extending photocatalytic lamps 10 are arranged in a circular array around the barrel lid 6. These photocatalytic lamps 10 emit ultraviolet light. Under the irradiation of ultraviolet light, the hydrogen peroxide introduced into the reaction cells undergoes a decomposition reaction, producing hydroxyl radicals (OH), a highly oxidizing agent. Hydroxyl radicals (OH) have extremely strong oxidizing power, with an oxidation-reduction potential of 2.8V, and can indiscriminately attack the chemical bonds in organic pollutants, mineralizing them into carbon dioxide, water, and inorganic salts. A paddle shaft 8, extending vertically downward, is rotatably mounted at the center of the lid 6. Two or more stirring blades 9 are evenly spaced and mounted on the shaft. Paddle shaft 8 is driven by a drive motor 7 fixed to the lid 6. Driven by the drive motor 7, paddle shaft 8 rotates, and the stirring blades 9 rotate accordingly, thoroughly mixing the wastewater and hydrogen peroxide within the reaction unit. This ensures full contact between the wastewater, hydrogen peroxide, and the generated hydroxyl radicals (OH), improving reaction efficiency. The treated wastewater is discharged from the reactor body 1 through the outlet pipe 4.

[0034] In this embodiment, a plurality of equal-height, non-connected reaction units are separated by a partition plate 17 within the reactor barrel 1. This reduces the effect of uneven wastewater sedimentation within a single reaction unit on ultraviolet light transmittance, allowing ultraviolet light to more effectively irradiate hydrogen peroxide, improving the photoexcitation efficiency of hydrogen peroxide and increasing the amount of OH generated, thereby meeting the requirements for pollutant degradation. The photocatalytic lamps 10 arranged in a circular array around the barrel cover 6 can relatively evenly irradiate each reaction unit. A stirring blade 9 is provided at the center of each reaction unit. The rotation of the stirring blade 9 creates a good hydraulic flow pattern for the wastewater within the reaction unit, allowing the wastewater to be fully mixed with the hydrogen peroxide and the generated hydroxyl radicals OH, thereby improving the uniformity and effectiveness of the reaction and solving the problem of poor hydraulic flow pattern in traditional equipment. Based on a set of light sources and stirring devices, this embodiment solves the effect of uneven sedimentation on ultraviolet light transmittance by stratifying the space within the barrel. The paddles enhance the hydraulic flow pattern, thereby improving the efficiency of the photocatalytic reaction in a compact volume environment and enhancing the ability to treat high-concentration, difficult-to-degrade organic wastewater.

[0035] Both the isolation plate 17 and the reactor body 1 are made of opaque material, and a reflective coating is applied to the upper and lower surfaces of the isolation plate 17 and the inner surface of the reactor body 1. The opaque material prevents UV light leakage, while the reflective coating reflects UV light back to the reaction unit, further improving the efficiency of UV light utilization and enhancing the photocatalytic reaction effect.

[0036] Example 2: Please refer to Figure 3 、 4 , 6, 7, a photocatalytic reactor for wastewater treatment, which differs from Example 1 in that a water collector 12 is provided at the bottom of the reactor barrel 1, and filter membrane columns 11 extending vertically upward are distributed in a ring array on the water collector 12. The filter membrane columns 11 pass through the membrane column holes 18 preset on the isolation plate 17 and are evenly distributed in each reaction unit, and one end of the water outlet pipe 4 extending into the barrel is connected to the water collector 12.

[0037] A backwash drain pipe 5 is connected to the center of the bottom of the reactor barrel 1 , and a water hole 14 is provided at the center of the water collector 12 .

[0038] A shaft seat 16 is fixedly installed at the center of the bottom of the reactor barrel 1, and lamp holders 15 are distributed in a circular array around it; the lower end of the blade shaft 8 is rotatably installed in the shaft seat 16, and the lower end of the photocatalytic lamp tube 10 is inserted into the lamp holder 15; grooves 13 are distributed in a circular array on the edge of the water collector 12, and the grooves 13 are used to avoid the lamp holder 15; a bracket is provided at the bottom of the water hole 14, and the shaft seat 16 is installed on the bracket.

[0039] Working principle of this embodiment:

[0040] The filter membrane columns 11 distributed in a circular array in each reaction unit play a role. Some suspended matter, large molecular organic matter and other impurities in the wastewater will be intercepted by the filter membrane columns 11, while the relatively clean water continues to flow downward through the filter membrane columns 11. Since the filter membrane columns 11 pass through the membrane column holes 18 preset on the isolation plate 17, the wastewater in each reaction unit can be filtered by the filter membrane columns 11. The water filtered by the filter membrane columns 11 is collected in the water collector 12 at the bottom of the reactor barrel 1. The water collector 12 collects the water filtered by each filter membrane column 11 and discharges it from the reactor through the outlet pipe 4, completing the entire wastewater treatment process. As the filter membrane column 11 is used for a long time, a large amount of impurities will accumulate on the surface, resulting in a decrease in filtration efficiency. At this time, backwash water can be introduced into the bottom of the reactor barrel 1 through the backwash drain pipe 5. Backwash water enters through the water hole 14 at the center of the water collector 12 and then strikes the filter membrane column 11 in the opposite direction, flushing away impurities attached to the surface of the filter membrane column 11. The impurities are then discharged from the reactor through the backwash drain pipe 5 along with the backwash water, thus cleaning the filter membrane column 11 and preventing clogging. This extends the service life of the filter membrane column 11 and reduces the operating cost and maintenance frequency of the equipment. The lower end of the blade shaft 8 is rotatably mounted in the shaft seat 16, ensuring the stable rotation of the blade shaft 8. The lower end of the photocatalytic lamp tube 10 is inserted into the lamp holder 15, ensuring the reliable fixation of the photocatalytic lamp tube 10.

[0041] In this embodiment, a filter membrane column is integrated inside the photocatalyst to remove impurities such as suspended solids and macromolecular organic matter in the wastewater, thereby improving the effluent quality; the backwashing and sewage discharge function can regularly clean the filter membrane column, extend its service life, and reduce operating costs and maintenance frequency.

Claims

1. A photocatalytic reactor for wastewater treatment, characterized in that: It includes a reactor barrel (1): The reactor barrel (1) is connected to a water inlet pipe (3) at the top and a water outlet pipe (4) at the bottom, a barrel support (2) is welded to the bottom, and a barrel cover (6) is installed on the top; A paddle shaft (8) extending vertically downward is rotatably mounted at the center of the barrel cover (6), and two or more stirring blades (9) are evenly spaced on the paddle shaft (8). The paddle shaft (8) is driven by a drive motor (7) fixedly mounted on the barrel cover (6), and two or more photocatalytic lamps (10) extending vertically downward are distributed in a circular array around the barrel cover (6); The reactor barrel (1) is provided with one or more horizontally placed isolation plates (17), which separate the reactor barrel (1) into a plurality of reaction units of equal height and not connected. A stirring blade (9) is provided at the center of each reaction unit. One end of the water inlet pipe (3) extending into the barrel is provided with a water distribution pipe (21) extending vertically downward. The water distribution pipe (21) is provided with water distribution ports (22) corresponding to the reaction units one by one. The isolation plate (17) is provided with an axial hole (20), a tube hole (23) and a lamp tube hole (19). The axial hole (20), the tube hole (23) and the lamp tube hole (19) are respectively used to avoid the blade shaft (8), the photocatalytic lamp (10) and the water distribution pipe (21).

2. The photocatalytic reactor for wastewater treatment according to claim 1, characterized in that: A water collector (12) is provided at the bottom of the reactor barrel (1), and filter membrane columns (11) extending vertically upward are distributed in a circular array on the water collector (12). The filter membrane columns (11) pass through membrane column holes (18) preset on the isolation plate (17) and are evenly distributed in each reaction unit. One end of the water outlet pipe (4) extending into the barrel is connected to the water collector (12).

3. The photocatalytic reactor for wastewater treatment according to claim 2, characterized in that: A backwash drain pipe (5) is connected to the center of the bottom of the reactor barrel (1), and a water hole (14) is provided at the center of the water collector (12).

4. The photocatalytic reactor for wastewater treatment according to claim 3, characterized in that: A shaft seat (16) is fixedly installed at the center of the bottom of the reactor barrel (1), and lamp holders (15) are distributed in a circular array around the periphery; the lower end of the blade shaft (8) is rotatably installed in the shaft seat (16), and the lower end of the photocatalytic lamp tube (10) is plugged into the lamp holder (15); grooves (13) are distributed in a circular array on the edge of the water collector (12), and the grooves (13) are used to avoid the lamp holders (15); a bracket is provided at the bottom of the water hole (14), and the shaft seat (16) is installed on the bracket.

5. The photocatalytic reactor for wastewater treatment according to claim 1, characterized in that: The isolation plate (17) and the reactor barrel (1) are both made of opaque materials.

6. The photocatalytic reactor for wastewater treatment according to claim 1, characterized in that: The upper and lower surfaces of the isolation plate (17) and the inner surface of the reactor barrel (1) are both provided with a reflective coating.

7. The photocatalytic reactor for wastewater treatment according to claim 1, characterized in that: A hydrogen peroxide delivery pipe is arranged outside the water inlet pipe (3), and the hydrogen peroxide delivery pipe is provided with delivery ports corresponding to the reaction units one by one.

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