Sewage treatment device for deeply removing refractory COD (Chemical Oxygen Demand)

Abstract

The utility model discloses a sewage treatment device for deeply removing refractory COD (Chemical Oxygen Demand), and belongs to the field of sewage treatment. A water inlet pipe is arranged at the front end of the distribution well; a first ozone aeration system is arranged in the primary ozone oxidation ditch; a first closed vertical ultraviolet disinfection device is arranged in the first-stage ultraviolet catalysis channel; a second ozone aeration system is arranged in the second-stage ozone oxidation ditch; a second closed vertical ultraviolet disinfection device is arranged in the second-stage ultraviolet catalysis channel; a third ozone aeration system is arranged in the third-stage ozone oxidation ditch; a horn mouth is arranged on a drainage port of the drainage well, and the drainage well is connected with a drainage pipe through the horn mouth. The device can form three-stage ozone oxidation reaction and two-stage ultraviolet catalytic reaction treatment on sewage, and multi-stage series connection can improve the volume load, reduce the ozone aeration rate and improve the COD (Chemical Oxygen Demand) removal rate.

Description

Technical Field

[0001] The utility model relates to the field of sewage treatment equipment, in particular to a sewage treatment device for deeply removing refractory COD. Background Art

[0002] Some sewage still contains a certain concentration of pollutants after being treated by the biochemical system. These pollutants are difficult to biodegrade and have very poor biodegradability. They are difficult to remove simply by reducing the organic load and increasing the retention time.

[0003] For refractory wastewater, without an advanced oxidation process, the soluble refractory substances in the wastewater are essentially impossible to remove. Even with MBR treatment technology, these soluble substances can still pass through the membrane, resulting in the effluent failing to meet standards. To further remove refractory organic matter, advanced oxidation technology is required.

[0004] Advanced oxidation technologies mainly include ozone oxidation, catalytic oxidation, Fenton reagent, etc. Among them, catalytic oxidation technology generally has strict requirements on reaction conditions, usually requiring high pressure, high temperature, catalyst, etc. Fenton technology uses Fe 2+ The H2O2 reaction is greatly affected by pH, requiring repeated pH adjustments, and the effluent may have color. However, the ozone oxidation process has strong oxidizing properties and no secondary pollution.

[0005] O3 has a redox potential of 2.07V, making it an extremely strong oxidant. It can effectively remove color, turbidity, odor, and taste, as well as pollutants such as phenol, cyanide, sulfide, pesticides, and petroleum from wastewater. O3 oxidation occurs in two ways: one in which O3 molecules or single O atoms directly participate in the reaction; the other is caused by OH radicals generated by O3 decay. The redox potential of OH- is 2.8V, second only to F (2.87V), making it the strongest oxidant in water. It reacts almost non-selectively with all pollutants in wastewater, completely oxidizing intermediate products that O3 cannot oxidize and decompose, such as glycerol, ethanol, and acetic acid, into CO2 and H2O.

[0006] When O3 is dissolved in water and exposed to UV light, the following reaction occurs:

[0007] O3+H2O→O2+H2O2;

[0008] H2O2+H2O→O2+2OH - ;

[0009] The synergistic effect of O3 and UV produces OH-, which can also induce a series of chain reactions to produce other ground-state substances and free radicals, thereby strengthening the oxidation effect and making the degradation of pollutants rapid and complete. A single O3 oxidation reaction does not produce the above-mentioned substances.

[0010] Chinese patent application number CN20141077653.2 discloses a method for deep treatment of industrial park wastewater that utilizes advanced oxidation treatment. The effluent from flocculation and sedimentation treatment enters an advanced oxidation system consisting of a UV and ozone system. The ozone and UV synergistically act to oxidize hydroxyl radicals, removing recalcitrant organic matter from the water. The treated effluent then enters subsequent treatment. The advanced oxidation system, comprising both the UV and ozone systems, achieves this synergistic effect by placing pure titanium aeration heads at the bottom of the system and UV lamps above them.

[0011] Chinese patent application number CN201410778032.4 discloses a method and system for the reuse of municipal wastewater, including ozone-UV catalytic oxidation disinfection. The effluent after flocculation and sedimentation enters the ozone-UV catalytic oxidation disinfection system, where ozone and UV light are combined to remove cyclic organic matter, some toxic substances, and refractory substances contained in the effluent. After ozone-UV catalytic oxidation treatment, the effluent meets the standards for reclaimed water reuse and is then reused. The combined action of the ozone-UV catalytic oxidation system is achieved through a pre-ozone contact tank, a closed UV system, a post-ozone contact disinfection tank, a metering tank, and an outlet tank.

[0012] In view of this, the present utility model is proposed. Utility Model Content

[0013] The purpose of this utility model is to provide a sewage treatment device for deeply removing difficult-to-degrade COD, which can remove difficult-to-degrade COD and high chroma more stably and safely, has strong load impact resistance and simple operation. It is suitable for upgrading and transforming the difficult-to-degrade COD treatment of urban park sewage that does not meet the standards to the surface water standard, thereby solving the above-mentioned technical problems existing in the prior art.

[0014] The purpose of this utility model is achieved through the following technical solutions:

[0015] A sewage treatment device for deep removal of refractory COD, comprising:

[0016] The main tank body has a distribution well at the front end, and the main tank body behind the distribution well is provided with a first-level ozone oxidation channel, a first-level ultraviolet catalytic channel, a second-level ozone oxidation channel, a second-level ultraviolet catalytic channel, a third-level ozone oxidation channel, a slow-release channel and a drainage well from front to back;

[0017] A water inlet pipe is provided at the front end of the distribution well;

[0018] A first ozone aeration system is provided in the first-level ozone oxidation channel;

[0019] A first closed vertical ultraviolet disinfection device is provided in the first-level ultraviolet catalytic channel;

[0020] A second ozone aeration system is provided in the secondary ozone oxidation channel;

[0021] A second closed vertical ultraviolet disinfection device is provided in the secondary ultraviolet catalytic channel;

[0022] A third ozone aeration system is provided in the three-stage ozone oxidation channel;

[0023] A bell mouth is provided on the drainage outlet of the drainage well, and is connected to the drainage pipe through the bell mouth.

[0024] Compared with the prior art, the sewage treatment device provided by the present invention for deep removal of refractory COD has the following beneficial effects:

[0025] By installing a first-stage ozone oxidation channel, a first-stage ultraviolet catalytic channel, a second-stage ozone oxidation channel, a second-stage ultraviolet catalytic channel, and a third-stage ozone oxidation channel in a sequentially connected manner within the main tank, a three-stage ozone oxidation reaction and a two-stage ultraviolet catalytic reaction can be formed for the sewage. The multi-stage series connection can increase the volumetric load, reduce the amount of ozone aeration, and improve the COD removal rate. The traditional ozone removal COD ratio is 2.5-3. After the action of the ozone ultraviolet system and the multi-stage series reaction, the ozone removal COD ratio drops to 2.0-2.5, and the removal rate of COD that is difficult to degrade by ozone alone is improved. By using a first enclosed vertical ultraviolet disinfection device and a second enclosed vertical ultraviolet disinfection device, compared with horizontally placed lamps, it saves more space and reduces the risk of ozone leakage. Vertical installation is more conducive to ultraviolet radiation from all sides of the water flow, and this ultraviolet disinfection device has a synergistic catalytic effect with ozone disinfection. Compared with ozone catalyst packing, there is no explosion risk and it is safer. The device can effectively remove difficult-to-degrade COD and high color in sewage, and has strong load impact resistance and simple operation. It is suitable for upgrading the difficult-to-degrade COD treatment of urban park sewage to surface water standards. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0027] Figure 1 This is a schematic diagram of the structure of a sewage treatment device for deep removal of refractory COD provided in an embodiment of the present utility model.

[0028] The marks in the figure are: 1-distribution well; 2-first-level ozone oxidation channel; 3-first ozone pipe; 4-first ozone aeration device; 5-ultraviolet catalytic channel; 6-first closed vertical ultraviolet disinfection device; 7-first sealing cover; 8-sealing channel steel; 9-sealing water level; 10-second-level ozone oxidation channel; 11-second-level ultraviolet catalytic channel; 12-third-level ozone oxidation channel; 13-slow-release channel; 14-bell mouth; 15-second ozone pipe; 16-third ozone pipe; 17-second sealing cover; 18-second closed vertical ultraviolet disinfection device; 19-second aeration device; 20-third aeration device; A-water inlet pipe; B-water outlet pipe. DETAILED DESCRIPTION

[0029] The following is a clear and complete description of the technical solutions in the embodiments of the present invention, in conjunction with the accompanying drawings. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of them, and do not constitute a limitation of the present invention. All other embodiments derived by persons of ordinary skill in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0030] First, the following terms may be used in this article:

[0031] The term “and / or” means that either or both of them can be realized at the same time. For example, X and / or Y includes both “X” or “Y” and “X and Y”.

[0032] The terms "include," "comprises," "contains," "has," or other similar expressions should be interpreted as non-exclusive. For example, "including certain technical features (such as raw materials, components, ingredients, carriers, dosage forms, materials, dimensions, parts, components, mechanisms, devices, steps, procedures, methods, reaction conditions, processing conditions, parameters, algorithms, signals, data, products, or manufactured articles, etc.) should be interpreted as including not only the technical features explicitly listed, but also other technical features known in the art that are not explicitly listed.

[0033] The term "consisting of" excludes any technical features not explicitly listed. If used in a claim, this term renders the claim closed, excluding any technical features other than those explicitly listed, except for conventional impurities associated with them. If this term appears only in a clause of a claim, it limits only the elements explicitly listed in that clause; elements listed in other clauses are not excluded from the claim as a whole.

[0034] Unless otherwise specified or limited, the terms "mounted," "connected," "connect," and "fixed" should be interpreted broadly. For example, they can refer to fixed, detachable, or integral connections; mechanical or electrical connections; direct or indirect connections through an intermediary; and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in this document based on specific circumstances.

[0035] The terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings and are only for the convenience and simplification of description, and do not explicitly or implicitly indicate that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore should not be understood as a limitation to this document.

[0036] The solutions provided by the present invention are described in detail below. Any content not described in detail in the examples of the present invention belongs to the prior art known to those skilled in the art. Where specific conditions are not specified in the examples of the present invention, the experiments were carried out according to conventional conditions in the art or the conditions recommended by the manufacturer. Where the manufacturers of reagents or instruments used in the examples of the present invention are not specified, they are all conventional products that can be purchased commercially.

[0037] like Figure 1 As shown, the embodiment of the present invention provides a sewage treatment device for deep removal of refractory COD, which can improve the treatment effect of the combined action of the ozone-ultraviolet catalytic oxidation system, reduce the equipment operation and maintenance costs and difficulty of operation and maintenance, and improve the safety of catalytic treatment. The device includes:

[0038] The main tank body 22 has a distribution well 1 at the front end. The main tank body 22 behind the distribution well 1 is provided with a primary ozone oxidation channel 2, a primary ultraviolet catalytic channel 5, a secondary ozone oxidation channel 10, a secondary ultraviolet catalytic channel 11, a tertiary ozone oxidation channel 12, a slow-release channel 13 and a drainage well 21, which are connected in sequence from front to back.

[0039] A water inlet pipe A is provided at the front end of the distribution well 1;

[0040] A first ozone aeration system is provided in the first-level ozone oxidation channel 2;

[0041] A first closed vertical ultraviolet disinfection device 6 is provided in the first-level ultraviolet catalytic channel 5;

[0042] A second ozone aeration system is provided in the secondary ozone oxidation channel 10;

[0043] A second closed vertical ultraviolet disinfection device 18 is provided in the secondary ultraviolet catalytic channel 11;

[0044] A third ozone aeration system is provided in the three-stage ozone oxidation channel 12;

[0045] A bell mouth 14 is provided on the drainage outlet of the drainage well 21 , and is connected to the drainage pipe B via the bell mouth 14 .

[0046] Preferably, in the above-mentioned device, the distribution well 1, the first-level ozone oxidation channel 2, the first-level ultraviolet catalytic channel 5, the second-level ozone oxidation channel 10, the second-level ultraviolet catalytic channel 11, the third-level ozone oxidation channel 12, the slow-release channel 13 and the drainage well 21 are provided with connecting openings that are staggered in sequence to form a return water flow channel between the distribution well 1 and the drainage well 21.

[0047] Preferably, in the above device, the first ozone aeration system is composed of a first ozone aeration device 4 provided at the bottom of the primary ozone oxidation channel 2 and a first ozone pipe 3 connected to the first ozone aeration device 4. The first ozone aeration device 4 is composed of a plurality of pure titanium metal aeration heads.

[0048] Preferably, in the above device, the second ozone aeration system is composed of a second ozone aeration device 19 provided at the bottom of the secondary ozone oxidation channel 10 and a second ozone pipe 15 connected to the second ozone aeration device 19. The second ozone aeration device 19 is composed of a plurality of pure titanium metal aeration heads.

[0049] Preferably, in the above device, the third ozone aeration system is composed of a third ozone aeration device 20 provided at the bottom of the third-stage ozone oxidation channel 12 and a third ozone pipe 16 connected to the third ozone aeration device 20. The second ozone aeration device 19 is composed of a plurality of pure titanium metal aeration heads.

[0050] Preferably, in the above device, the first enclosed vertical ultraviolet disinfection device 6 is arranged on the top of the first-level ultraviolet catalytic channel 5;

[0051] The second enclosed vertical ultraviolet disinfection device 18 is disposed at the top of the secondary ultraviolet catalytic channel 11 .

[0052] Preferably, in the above-mentioned device, the upper end opening of the first closed vertical ultraviolet disinfection device 6 is located outside the upper end of the first-level ultraviolet catalytic channel 5, and a sealing channel steel 8 is provided on the upper end opening. A sealing water level 9 is provided in the sealing channel steel 8, and the first sealing cover 7 is sealed and buckled on the upper end opening of the first closed vertical ultraviolet disinfection device 6 through the sealing water level 9 in the sealing channel steel 8.

[0053] Preferably, in the above device, a sealing channel steel is provided on the upper opening of the second closed vertical ultraviolet disinfection device 18, a sealing water level is provided in the sealing channel steel, and the second sealing cover 17 is sealed and buckled on the upper opening of the second closed vertical ultraviolet disinfection device 18 through the sealing water level in the sealing channel steel.

[0054] In summary, it can be seen that the sewage treatment device for deep removal of difficult-to-degrade COD in the embodiment of the present invention can form a three-stage ozone oxidation reaction and a two-stage ultraviolet catalytic reaction treatment. The multi-stage series connection can increase the volume load, reduce the ozone aeration volume, and improve the COD removal rate. The device can effectively remove difficult-to-degrade COD and high chroma in sewage, and has strong load impact resistance and simple operation. It is suitable for upgrading and transforming the difficult-to-degrade COD treatment of urban park sewage that does not meet the standards to the surface water standard. The traditional ozone COD removal ratio is 2.5 to 3, but after the sewage treatment device of the utility model is subjected to the action of the ozone ultraviolet system and the multi-stage series reaction, the ozone COD removal ratio is reduced to 2.0 to 2.5, and the removal rate of COD that is difficult to degrade by the action of ozone alone is improved; by adopting the first closed vertical ultraviolet disinfection device and the second closed vertical ultraviolet disinfection device, it saves more space and reduces the risk of ozone leakage compared with horizontal placement of lamps; vertical installation is more conducive to all-round ultraviolet irradiation of water flow, and this ultraviolet disinfection device has a synergistic catalytic effect with ozone disinfection. Compared with ozone catalyst fillers, it has no explosion risk and is safer.

[0055] In order to more clearly demonstrate the technical solution and technical effects provided by the present invention, the solution provided by the embodiments of the present invention will be described in detail with reference to specific embodiments below.

[0056] Example 1

[0057] like Figure 1 As shown, the sewage treatment device for deep removal of refractory COD provided in this embodiment can be used for deep treatment of urban sewage. It is a sewage treatment device for treating refractory COD by synergistic action of ozone and ultraviolet. The device comprises:

[0058] The main tank body 22 has a distribution well 1 at the front end. The main tank body 22 behind the distribution well 1 is provided with a primary ozone oxidation channel 2, a primary ultraviolet catalytic channel 5, a secondary ozone oxidation channel 10, a secondary ultraviolet catalytic channel 11, a tertiary ozone oxidation channel 12, a slow-release channel 13 and a drainage well 21, which are connected in sequence from front to back.

[0059] A water inlet pipe A is provided at the front end of the distribution well 1;

[0060] A first ozone aeration system is provided in the first-level ozone oxidation channel 2;

[0061] A first closed vertical ultraviolet disinfection device 6 is provided in the first-level ultraviolet catalytic channel 5;

[0062] A second ozone aeration system is provided in the secondary ozone oxidation channel 10;

[0063] A second closed vertical ultraviolet disinfection device 18 is provided in the secondary ultraviolet catalytic channel 11;

[0064] A third ozone aeration system is provided in the three-stage ozone oxidation channel 12;

[0065] A bell mouth 14 is provided on the drainage outlet of the drainage well 21 , and is connected to the drainage pipe B via the bell mouth 14 .

[0066] The first ozone aeration system, the second ozone aeration system and the third ozone aeration system have the same structure, and are all composed of ozone pipes connected by ozone aeration devices, and the ozone aeration devices are composed of multiple pure titanium metal aeration heads.

[0067] The above-mentioned first closed vertical ultraviolet disinfection device and the second closed vertical ultraviolet disinfection device have the same structure. Both are provided with a sealing channel steel on the upper end opening, a sealing water level is provided in the sealing channel steel, and the sealing cover is provided on the upper end opening of the closed vertical ultraviolet disinfection device through the sealing water level sealing buckle in the sealing channel steel.

[0068] like Figure 1 As shown, the sewage treatment process of the deep removal of refractory COD sewage treatment device is as follows:

[0069] (1) The treated sewage enters the distribution well 1 through the water inlet pipe A and then enters the primary ozone oxidation channel 2. The first ozone aeration device 4 of the first ozone aeration system is set at the bottom of the primary ozone oxidation channel 2. Ozone enters the first ozone aeration device 4 through the first ozone pipe 3 and is aerated by the pure titanium metal aeration head of the first ozone aeration device 4. Part of the ozone reacts directly with the pollutants in the water, and a small part of the ozone decomposes into OH free radicals generated by attenuation and reacts with COD in the water.

[0070] (2) Unreacted and unattenuated ozone flows along the water flow into the primary ultraviolet catalytic channel 5. A first sealed vertical ultraviolet device 6 is set on the upper part of the primary ultraviolet catalytic channel 5. After being irradiated by ultraviolet rays, ozone produces OH and other ground state substances and free radicals, thereby strengthening the oxidation effect.

[0071] (3) The water flows into the secondary ozone catalytic channel 10 and the secondary ultraviolet catalytic channel 11, further strengthening the oxidation effect and then decomposing COD.

[0072] (4) After the secondary enhancement, the sewage enters the tertiary ozone catalytic channel 12, and the multi-stage reaction is connected in series to improve the COD treatment efficiency. The sewage passes through the slow-release channel 13, releases excess ozone, and then flows out through the bell mouth 14 to enter the next process.

[0073] Compared with the existing traditional sewage treatment process, the process of this utility model has the following beneficial effects:

[0074] (1) The device uses a three-stage ozone oxidation reaction and a two-stage UV catalytic reaction. The multi-stage series connection can increase the volume load, reduce the ozone aeration volume, and improve the COD removal rate. The traditional ozone removal COD ratio is 2.5-3. After the ozone UV system and multi-stage series reaction, the ozone removal COD ratio drops to 2.0-2.5, and the removal rate of COD that is difficult to degrade by ozone alone is improved.

[0075] (2) The sealed vertical UV device consists of a vertical UV lamp tube and a sealing component. Compared with horizontal placement of the UV lamp tube, vertical installation of the UV lamp tube saves more space and reduces the risk of ozone leakage; vertical installation is more conducive to the full irradiation of the water flow by ultraviolet rays. The sealing device of this device is simple and effective. On the top of the pool, sealing channel steel is installed around the sealed vertical UV device, the sealing channel steel is filled with water, and the bottom edge of the sealing cover is placed in the sealing channel steel. The sealing channel steel, water level and sealing cover form a sealing structure to prevent ozone from escaping.

[0076] (3) The sealed vertical UV device with synergistic catalysis is safer than ozone catalyst packing, without explosion hazard. The UV lamp adopts interlaced modules. One sealed vertical UV device is divided into 4 modules. If the lamp needs to be replaced during subsequent operation, the module can be quickly lifted and replaced outside the pool.

[0077] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by any person skilled in the art within the technical scope disclosed in the present invention should be included in the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be based on the scope of protection of the claims. The information disclosed in the background technology section of this article is only intended to deepen the understanding of the overall background technology of the present invention, and should not be regarded as an admission or any form of implication that the information constitutes prior art already known to those skilled in the art.

Claims

1. A sewage treatment device for deep removal of refractory COD, characterized in that: include: The main tank body (22) is provided with a distribution well (1) at the front end. The main tank body (22) behind the distribution well (1) is provided with a first-level ozone oxidation channel (2), a first-level ultraviolet catalytic channel (5), a second-level ozone oxidation channel (10), a second-level ultraviolet catalytic channel (11), a third-level ozone oxidation channel (12), a slow-release channel (13) and a drainage well (21) in sequence from front to back. A water inlet pipe () is provided at the front end of the distribution well (1); A first ozone aeration system is provided in the first-level ozone oxidation channel (2); A first sealed vertical ultraviolet disinfection device (6) is provided in the first-level ultraviolet catalytic channel (5); A second ozone aeration system is provided in the secondary ozone oxidation channel (10); A second sealed vertical ultraviolet disinfection device (18) is provided in the secondary ultraviolet catalytic channel (11); A third ozone aeration system is provided in the three-stage ozone oxidation channel (12); A bell mouth (14) is provided on the drainage outlet of the drainage well (21), and is connected to the drainage pipe (B) via the bell mouth (14).

2. The sewage treatment device for deep removal of refractory COD according to claim 1, characterized in that: The distribution well (1), the primary ozone oxidation channel (2), the primary ultraviolet catalytic channel (5), the secondary ozone oxidation channel (10), the secondary ultraviolet catalytic channel (11), the tertiary ozone oxidation channel (12), the slow-release channel (13) and the drainage well (21) are provided with communication openings staggered in sequence to form a return water flow channel between the distribution well (1) and the drainage well (21).

3. The sewage treatment device for deep removal of refractory COD according to claim 1 or 2, characterized in that: The first ozone aeration system is composed of a first ozone aeration device (4) arranged at the bottom of the first-level ozone oxidation channel (2) and a first ozone pipe (3) connected to the first ozone aeration device (4).

4. The sewage treatment device for deep removal of refractory COD according to claim 1 or 2, characterized in that: The second ozone aeration system is composed of a second ozone aeration device (19) arranged at the bottom of the secondary ozone oxidation channel (10) and a second ozone pipe (15) connected to the second ozone aeration device (19).

5. The sewage treatment device for deep removal of refractory COD according to claim 1 or 2, characterized in that: The third ozone aeration system is composed of a third ozone aeration device (20) arranged at the bottom of the third-stage ozone oxidation channel (12) and a third ozone pipe (16) connected to the third ozone aeration device (20).

6. The sewage treatment device for deep removal of refractory COD according to claim 1, characterized in that: The first enclosed vertical ultraviolet disinfection device (6) is arranged at the top of the first-level ultraviolet catalytic channel (5); The second sealed vertical ultraviolet disinfection device (18) is arranged at the top of the secondary ultraviolet catalytic channel (11).

7. The sewage treatment device for deep removal of refractory COD according to claim 1 or 6, characterized in that: The upper end opening of the first enclosed vertical ultraviolet disinfection device (6) is located outside the upper end of the first-level ultraviolet catalytic channel (5), and a sealing channel steel (8) is provided on the upper end opening. A sealing water level (9) is provided in the sealing channel steel (8), and the first sealing cover (7) is sealed and buckled on the upper end opening of the first enclosed vertical ultraviolet disinfection device (6) through the sealing water level (9) in the sealing channel steel (8).

8. The sewage treatment device for deep removal of refractory COD according to claim 7, characterized in that: A sealing channel steel is provided on the upper opening of the second enclosed vertical ultraviolet disinfection device (18), a sealing water level is provided in the sealing channel steel, and the second sealing cover (17) is sealed and buckled on the upper opening of the second enclosed vertical ultraviolet disinfection device (18) through the sealing water level in the sealing channel steel.

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