Photocatalytic denitrification device

Abstract

The utility model relates to the technical field of wastewater treatment, and discloses a photocatalytic denitrification device which comprises a reaction tank, a catalytic cylinder is arranged in the reaction tank, the top of the catalytic cylinder is an open end and is filled with a photocatalyst, a gap is reserved between the catalytic cylinder and an inner cavity of the reaction tank, a first-stage photocatalytic mechanism is arranged in the catalytic cylinder, and a second-stage photocatalytic mechanism is arranged in the first-stage photocatalytic mechanism. And a secondary photocatalysis mechanism is arranged between the catalysis cylinder and the reaction tank. Wastewater is subjected to a primary photocatalysis reaction in the catalysis tank through the primary photocatalysis mechanism and then enters the reaction tank to be subjected to secondary photocatalysis through the secondary photocatalysis mechanism, and in the secondary photocatalysis process, the volume of the wastewater is thinned when the wastewater flows due to separation of the photocatalysis plates, so that the light absorption thickness of liquid is reduced, and the light absorption efficiency is improved. According to the invention, the ultraviolet light is introduced into the wastewater, so that the propagation distance of the ultraviolet light in the wastewater is increased, and illumination can more effectively penetrate through the wastewater, thereby improving the activation efficiency of the titanium dioxide film in the wastewater, ensuring the maximum activity of the photocatalyst and greatly improving the wastewater denitrification effect.

Description

TECHNICAL FIELD

[0001] The utility model relates to wastewater treatment technical field, concretely is a kind of photocatalytic denitrification device. BACKGROUND

[0002] Nitrogen compounds, especially ammonia nitrogen and nitrate nitrogen, are one of the main components of water pollution, usually from agricultural drainage, industrial wastewater and municipal sewage etc.Excessive nitrogen elements not only cause water eutrophication, but also cause algae to breed, thereby destroying ecological environment and water quality.Photocatalytic denitrification technology is a new wastewater treatment method, which promotes the degradation and conversion of nitrogen compounds under light conditions using photocatalyst to achieve the purpose of removing nitrogen pollutants in wastewater.

[0003] The device is disclosed in the patent CN214457333U, which is a photocatalytic nitrogen-containing organic wastewater treatment device. The device includes a sedimentation tank, a filter tank, a photochemical reaction tank, a UV lamp, a catalyst tank, a motor, and a stirring rod. The wastewater is first deposited in the sedimentation tank to remove impurities. The floating materials that cannot be deposited are filtered in the filter tank and then enter the photochemical reaction tank. The catalyst in the catalyst tank enters the photochemical reaction tank and fully mixes with the wastewater under the stirring of the motor-driven stirring rod. At the same time, the UV lamp performs photocatalytic reaction on the wastewater, thereby solving the problem of unsatisfactory wastewater treatment effect in the prior art.

[0004] However, in the above-mentioned solution, the UV lamp is arranged at the top of the photochemical reaction tank. Due to the refraction and scattering loss of light, the intensity of the light emitted by the UV lamp will gradually weaken when passing through the wastewater, resulting in a significant uneven illumination of the wastewater at the bottom of the photochemical reaction tank. In the area with insufficient light, the photocatalyst cannot be fully activated, thereby reducing the degradation rate of nitrogen compounds in the wastewater.

[0005] Therefore, we propose a photocatalytic denitrification device to solve the problems mentioned above. CONTENT OF THE UTILITY MODEL

[0006] (I) Technical problem solved

[0007] In view of the deficiencies of the prior art in the above background technology, the purpose of the present utility model is to provide a photocatalytic denitrification device to solve the problems mentioned in the above background technology.

[0008] (II) Technical solution

[0009] To achieve the above purpose, the utility model is realized by the following technical solutions:

[0010] The utility model provides a kind of photocatalytic denitrification device, including reaction tank, the catalytic cylinder is arranged in the reaction tank, the top of the catalytic cylinder is open end and is filled with photocatalyst, the catalytic cylinder is spaced apart with the cavity of reaction tank, a primary photocatalytic mechanism is arranged in the catalytic cylinder, a secondary photocatalytic mechanism is arranged between the catalytic cylinder and reaction tank, water inlet pipe is arranged in the side of reaction tank and is communicated with catalytic cylinder, and water outlet pipe is arranged in the bottom of reaction tank.

[0011] Further, the primary photocatalytic mechanism includes ultraviolet lamp column, the first lamp groove is vertically provided on the inner wall of the catalytic cylinder, and the ultraviolet lamp column is installed in the plurality of first lamp grooves.

[0012] Further, the top of the catalytic cylinder is provided with a filter screen.

[0013] Further, the secondary photocatalytic mechanism includes a plurality of photocatalytic plates installed on the outer wall of the catalytic cylinder, the plurality of photocatalytic plates are in a spiral structure and arranged circumferentially along the catalytic cylinder, a catalytic channel is formed between two adjacent photocatalytic plates, a water inlet and a water outlet are formed at the top and the bottom of the two adjacent photocatalytic plates respectively, a second lamp groove is vertically provided on the inner wall of the reaction tank, and a plurality of ultraviolet lamp beads are arranged in the second lamp groove.

[0014] Preferably, the first lamp groove, the second lamp groove and the ultraviolet lamp column are circumferentially arranged in the catalytic cylinder, and the plurality of ultraviolet lamp columns are one-to-one installed in the first lamp grooves.

[0015] Further, the photocatalyst is anatase titanium dioxide, and a titanium dioxide film is coated on the photocatalytic plate.

[0016] Preferably, the catalytic cylinder is provided with a stirring mechanism, the stirring mechanism includes a stirring shaft rotatably installed in the catalytic cylinder, a plurality of first stirring rods are arranged on the stirring shaft, and a driving motor for rotating the stirring shaft is arranged at the top of the reaction tank.

[0017] Further, the bottom of the stirring shaft is provided with a second stirring rod, and one end of the second stirring rod is downwardly inclined.

[0018] Further, the water inlet pipe and the water outlet pipe are both provided with electromagnetic valves.

[0019] (Three) beneficial effects

[0020] Compared with the prior art, the utility model has the beneficial effects that:

[0021] The wastewater is preliminarily photocatalyzed by a first photocatalytic mechanism in the catalytic tank, and the concentration of nitrogen compounds in the wastewater is significantly reduced, and then the wastewater is subjected to secondary photocatalysis by a second photocatalytic mechanism in the reaction tank, in the secondary photocatalysis process, the wastewater is thinned in volume due to the separation of the photocatalytic plates, the light absorption thickness of the liquid is reduced, the propagation distance of the ultraviolet light in the wastewater is increased, the illumination energy can more effectively penetrate the wastewater, and thus the activation efficiency of the titanium dioxide film in the wastewater is improved, the activity of the photocatalyst is maximized, and the denitrification effect of the wastewater is greatly improved. BRIEF DESCRIPTION OF DRAWINGS

[0022] Figure 1 It is an external structure schematic view of the photocatalytic denitrification device of the utility model;

[0023] Figure 2 It is a sectional structure schematic view of the photocatalytic denitrification device of the utility model;

[0024] Figure 3 It is a structure schematic view of the first photocatalytic mechanism and the stirring mechanism of the photocatalytic denitrification device of the utility model;

[0025] Figure 4 It is a structure schematic view of the second photocatalytic mechanism of the photocatalytic denitrification device of the utility model.

[0026] In the drawing: reaction tank 1, catalytic cylinder 2, first photocatalytic mechanism 3, first lamp groove 31, ultraviolet lamp column 32, second photocatalytic mechanism 4, photocatalytic plate 41, catalytic channel 42, second lamp groove 43, ultraviolet lamp pearl 44, water inlet 45, water outlet 46, stirring mechanism 7, stirring shaft 71, first stirring rod 72, second stirring rod 73, driving motor 74, electromagnetic valve 8. DETAILED DESCRIPTION

[0027] The technical solutions in the embodiments of the utility model will be clearly and completely described below with reference to the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor fall within the protection scope of the utility model.

[0028] Please refer to Figures 1-4As shown, the utility model provides a kind of photocatalytic denitrification device, including reaction tank 1 and being arranged in its inside and being provided with catalytic cylinder 2, the top of catalytic cylinder 2 is open end and is filled with photocatalyst, photocatalyst adopts anatase titanium dioxide, catalytic cylinder 2 and the interval of reaction tank 1 inner cavity, reaction tank 1 side is provided with the water inlet pipe 5 being communicated with catalytic cylinder 2, reaction tank 1 bottom is inverted bucket shape structure and is provided with water outlet pipe 6, water inlet pipe 5 and water outlet pipe 6 are all provided with solenoid valve 8, catalytic cylinder 2 is provided with primary photocatalytic mechanism 3, catalytic cylinder 2 and reaction tank 1 between being provided with secondary photocatalytic mechanism 4, catalytic cylinder 2 is provided with the stirring mechanism 7 for stirring homogenization photocatalyst and waste water.

[0029] As Figure 3 Shown, primary photocatalytic mechanism 3 includes ultraviolet lamp column 32 and filter screen 33 being arranged in the top of catalytic cylinder 2, and the first lamp groove 31 is vertically opened in the inner wall of catalytic cylinder 2, and ultraviolet lamp column 32 is installed in multiple first lamp grooves 31.Waste water enters catalytic cylinder 2 from the bottom of water inlet pipe 5, and overflow from catalytic cylinder 2, in this process, stirring mechanism 7 stirs waste water and photocatalyst (anatase titanium dioxide), so that it is contacted uniformly, then under the irradiation of ultraviolet lamp column 32, photocatalyst produces electron-hole pair, and the electron and hole on the surface of photocatalyst participate in the reaction, convert nitrogen compounds into nitrogen N2 or other harmless substances, and denitrify waste water.

[0030] As Figure 4 Shown, secondary photocatalytic mechanism 4 includes multiple photocatalytic plates 41 being installed on the outer wall of catalytic cylinder 2, photocatalytic plate 41 is coated with titanium dioxide film, multiple photocatalytic plates 41 are all in spiral structure and are arranged along the circumference of catalytic cylinder 2, photocatalytic plate 41 both sides are fixed with the outer wall of catalytic cylinder 2 and the inner wall of reaction tank 1, catalytic passage 42 is formed between two adjacent photocatalytic plates 41, water inlet 45 and water outlet 46 are formed at the top and bottom of two adjacent photocatalytic plates 41 respectively, second lamp groove 43 is vertically opened in the inner wall of reaction tank 1, and multiple ultraviolet lamp beads 44 are arranged in second lamp groove 43.

[0031] Waste water after the reaction of primary photocatalytic mechanism 3 overflows from the top of catalytic cylinder 2, flows into catalytic passage 42 through water inlet 45, in the process of flowing downward, titanium dioxide film on the surface of catalytic passage 42 contacts with waste water, and photocatalytic reaction is carried out again under the irradiation of ultraviolet lamp bead 44, the volume of waste water is thinned when flowing due to the separation of photocatalytic plate 41, the light absorption thickness of liquid is reduced, the propagation distance of ultraviolet in waste water is increased, and the illumination energy can penetrate waste water more effectively, so as to improve the activation efficiency of titanium dioxide film in waste water, ensure the maximum activity of photocatalyst, and greatly improve the denitrification effect of waste water.

[0032] As a preferred technical scheme of the utility model: first lamp groove 31, second lamp groove 43, ultraviolet lamp post 32 are all provided with multiple along the circumferential direction of catalytic cylinder 2, multiple ultraviolet lamp posts 32 are installed in first lamp groove 31 one by one, to further improve photocatalytic efficiency.

[0033] As Figure 3 Shown, stirring mechanism 7 includes the stirring shaft 71 of rotation installation in catalytic cylinder 2, is provided with multiple first stirring rod 72 on stirring shaft 71, and the second stirring rod 73 of stirring shaft 71 bottom is provided with, and the second stirring rod 73 one end is inclined downward and is arranged, and the drive motor 74 for rotating stirring shaft 71 is arranged in the top of reaction kettle 1.

[0034] The setting of stirring mechanism 7 makes the contact of waste water and photocatalyst more uniform in the primary photocatalytic reaction, and the setting of the second stirring rod 73 makes the photocatalyst float upward when stirring shaft 71 rotates, prevents it from accumulating at the bottom of catalytic cylinder 2, causes the uneven contact with waste water, and reduces the photocatalytic efficiency.

[0035] For those skilled in the art, the specific meaning of the above terms in the utility model can be understood according to the specific circumstances; for those skilled in the art, the technical solutions recorded in the foregoing embodiments can still be modified, or some technical features can be replaced, any modification, equivalent replacement, improvement, etc. within the spirit and principles of the utility model should be included in the protection scope of the utility model.

Claims

1. A photocatalytic denitrification device, comprising a reaction tank (1), characterized in that: A catalytic cartridge (2) is provided in the reaction tank (1), the top of the catalytic cartridge (2) is open and filled with a photocatalyst, a gap is left between the catalytic cartridge (2) and the inner cavity of the reaction tank (1), a primary photocatalytic mechanism (3) is provided in the catalytic cartridge (2), a secondary photocatalytic mechanism (4) is provided between the catalytic cartridge (2) and the reaction tank (1), a water inlet pipe (5) in communication with the catalytic cartridge (2) is provided on one side of the reaction tank (1), and a water outlet pipe (6) is provided at the bottom of the reaction tank (1).

2. A photocatalytic denitrification device according to claim 1, characterized in that: The primary photocatalytic mechanism (3) comprises an ultraviolet lamp post (32); a first lamp slot (31) is vertically opened on the inner wall of the catalytic cylinder (2); and the ultraviolet lamp post (32) is installed in a plurality of first lamp slots (31).

3. The photocatalytic denitrification device according to claim 2, characterized in that: A filter screen (33) is provided on the top of the catalytic cylinder (2).

4. The photocatalytic denitrification device according to claim 2, characterized in that: The secondary photocatalytic mechanism (4) comprises a plurality of photocatalytic plates (41) mounted on the outer wall of the catalytic cylinder (2); the plurality of photocatalytic plates (41) are all spirally structured and arranged circumferentially along the catalytic cylinder (2); a catalytic channel (42) is formed between two adjacent photocatalytic plates (41); a water inlet (45) and a water outlet (46) are formed at the top and bottom of the two adjacent photocatalytic plates (41), respectively; a second lamp trough (43) is vertically opened on the inner wall of the reaction tank (1); a plurality of ultraviolet lamp beads (44) are arranged inside the second lamp trough (43).

5. The photocatalytic denitrification device according to claim 4, characterized in that: The first lamp trough (31), the second lamp trough (43), and the ultraviolet lamp post (32) are all provided in plurality along the circumference of the catalytic cylinder (2), and the plurality of ultraviolet lamp posts (32) are installed in the first lamp trough (31) in a one-to-one correspondence.

6. The photocatalytic denitrification device according to claim 4, characterized in that: The photocatalyst is anatase-type titanium dioxide, and the photocatalytic plate (41) is coated with a titanium dioxide film.

7. The photocatalytic denitrification device according to claim 2, characterized in that: A stirring mechanism (7) is provided in the catalytic cylinder (2), the stirring mechanism (7) comprising a stirring shaft (71) rotatably mounted in the catalytic cylinder (2), a plurality of first stirring rods (72) being provided on the stirring shaft (71), and a driving motor (74) for rotating the stirring shaft (71) being provided on the top of the reaction tank (1).

8. The photocatalytic denitrification device according to claim 7, characterized in that: A second stirring rod (73) is provided at the bottom of the stirring shaft (71), and one end of the second stirring rod (73) is tilted downward.

9. The photocatalytic denitrification device according to claim 1, characterized in that: The water inlet pipe (5) and the water outlet pipe (6) are both provided with electromagnetic valves (8).

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