Low power consumption high efficiency ultraviolet photocatalytic oxidation method

Abstract

The application discloses a low-power-consumption high-efficiency ultraviolet photocatalytic oxidation method, which comprises the following steps: injecting at least one oxidant into an annular gap cavity between an ultraviolet lamp sleeve and a container; starting the ultraviolet lamp; and radiating ultraviolet light, which, together with a catalyst coated on the side wall of the container, generates ultraviolet photocatalysis, so that the oxidant is excited to generate active free radicals under the ultraviolet photocatalysis, and the oxidant and the active free radicals flow out of the container through a plurality of through holes from the annular gap cavity, so as to purify and disinfect water outside the container. The ultraviolet photocatalysis generated by the method can effectively generate high-concentration active free radicals, and the water purification and disinfection efficiency is improved. In addition, by injecting the oxidant into the annular gap cavity, the active free radicals can be continuously and efficiently generated in the annular gap cavity, and the ultraviolet lamp sleeve and the container can be well cleaned.

Description

Technical Field

[0001] This invention relates to the technical field of water purification, and in particular to a low-power, high-efficiency ultraviolet photocatalytic oxidation method. Background Technology

[0002] Ultraviolet lamps are environmentally friendly, pollution-free, and highly efficient water purification and disinfection devices. They come in various forms and categories, with the most common being the ultraviolet lamp tubes commonly used in water purification facilities for ultraviolet disinfection. Due to their ease of implementation, simple operation, and significant effects, they have a very wide range of applications.

[0003] The aforementioned ultraviolet lamps can emit ultraviolet light with a short wavelength (λ < 400 nm). Ultraviolet light can not only rapidly denature proteins, thereby effectively killing almost all bacteria and pathogens in the water, but also, when the wavelength is short and the dose is large, it can directly photolyze organic matter in the water (corresponding to reaction formulas 1-4 below).

[0004] R + hν(λ < 185nm) → R * (1)

[0005] R * →·R1+·CH2CH3 (2)

[0006] ·R1+hν(λ<185nm)→·I i (i = 1, 2, ..., n) (3)

[0007] ·I i +·I i →P (4)

[0008] Building upon conventional ultraviolet lamp disinfection and water purification technology, a highly efficient water purification technology synergistically incorporating ultraviolet light and semiconductor photocatalytic materials has been developed. This technology effectively stimulates reactive free radicals such as hydroxyl radicals (·OH) in water. Through addition, substitution, electron transfer, and bond breaking interactions between these reactive free radicals and organic compounds, large organic molecules are degraded into smaller molecules, or even directly into carbon dioxide (CO2) and water (H2O), thus achieving water purification. These reactive free radicals also include excited-state oxygen atoms (O... 1 D) Superoxide radicals (HO2) ·- / O2 ·- Singlet oxygen () 1 O2 and other substances also have strong oxidizing properties and can undergo mineralization reactions similar to ·OH to achieve water purification (corresponding to reaction formulas 5-8 below).

[0009] H2O + hν →·OH +·H (5)

[0010] R +·OH → ROH (6)

[0011] R +·OH → ·R + H2O (7)

[0012] R n +·OH → R n-1 + OH - (8)

[0013] Related studies have shown that the combined use of multiple oxidants and ultraviolet photocatalysis technology can further improve the disinfection and purification efficiency of water bodies, achieving significant improvements compared to using a single oxidant or ultraviolet photocatalysis alone. For example, the reaction of ozone with organic matter is selective and cannot completely decompose organic matter into CO2 and H2O; however, the combined use of ozone and ultraviolet photocatalysis technology can effectively improve water purification and disinfection efficiency. The working principle of the combined use of ozone and ultraviolet photocatalysis technology for water purification and deodorization is shown in reaction formula 9-11, where O3 represents ozone, UV represents ultraviolet radiation, hv represents photolysis, and O 1 D represents an excited-state oxygen atom, ·OH represents a hydroxyl radical, and H2O2 represents hydrogen peroxide.

[0014] O3 + UV(or hν, λ < 310 nm) → O2 + O( 1 D) (9)

[0015] O( 1 D) + H₂O → ·OH + ·OH → H₂O₂ (in water) (10)

[0016] O( 1 D) + H₂O → ·OH + ·OH (humid air) (11)

[0017] For example, the combined use of ozone and hydrogen peroxide can also produce a coupling enhancement effect, and its reaction principle is shown in reaction formula (12).

[0018] 2O3 + H2O2 → ·OH + ·OH + 3O2 (12)

[0019] Chlorine dioxide and hydrogen peroxide react to produce hypochlorous acid, a strong oxidizing agent.

[0020] 2ClO2 + H2O2 → 2HClO2 + O2 (13)

[0021] The combined use of hydrogen peroxide and ultraviolet photocatalysis also has a coupling enhancement effect:

[0022] H2O2 + UV (or hν, λ ≈ 200~280 nm) → ·OH + ·OH (14)

[0023] Another example is the combination of chlorine dioxide solution and ultraviolet light (R represents organic reactant, R* represents organic reaction product):

[0024] R + ClO2 → R * + ClO2 - (15)

[0025] ClO2 - + hν(λ < 300 nm)→ 2O( 1 D)+ Cl - (16)

[0026] However, on the one hand, the ultraviolet lamps in existing water purification facilities only perform ultraviolet disinfection, failing to fully utilize the inherent energy of the ultraviolet lamps to achieve the water purification effect of ultraviolet photocatalysis. In fact, the ultraviolet irradiation intensity of existing disinfection ultraviolet lamps at the pipe wall is relatively high (generally reaching 5000W / m). 2 (As mentioned above), if the high-intensity ultraviolet radiation near the wall of the ultraviolet lamp can be fully utilized, and sufficient oxidants such as O3, H2O2, and ClO2 are supplied to this area, supplemented by the catalytic effect of photocatalysts such as black titanium and titanium dioxide, the above-mentioned chemical reaction can be activated to generate a large number of active free radicals, which can effectively purify and enhance the disinfection of water. On the other hand, existing ultraviolet lamps for disinfection usually have a quartz tube sleeve encapsulated on the outside of the lamp tube for protection. The water directly contacts the outer wall of the outer sleeve, and the ultraviolet lamp generates high temperatures during long-term operation, causing the outer wall of the outer sleeve to easily form scale, which is very difficult to clean. Therefore, existing water purification technologies lack effective technical means to generate a large number of active free radicals and facilitate the cleaning of the ultraviolet lamp sleeve. Summary of the Invention

[0027] The technical problem to be solved by the present invention is to overcome the defects of the prior art, such as difficulty in effectively stimulating active free radicals, poor water purification effect, and easy scaling and cleaning of the outer casing, and to provide a low-power and high-efficiency ultraviolet photocatalytic oxidation method.

[0028] The present invention solves the above-mentioned technical problems through the following technical solution:

[0029] A low-power, high-efficiency ultraviolet photocatalytic oxidation method utilizes an ultraviolet disinfection device to purify and disinfect water flowing through the device. The ultraviolet disinfection device includes a container and an ultraviolet lamp sleeve housed within the container. The ultraviolet lamp sleeve includes an outer tube and an ultraviolet lamp housed within the outer tube. The side wall of the container has several through holes. The method includes the following steps:

[0030] Inject at least one oxidant into the annular gap cavity between the UV lamp sleeve and the container;

[0031] When the ultraviolet lamp is turned on, the emitted ultraviolet light and the catalyst coated on the side wall of the container work together to produce ultraviolet photocatalysis, so that the oxidant can be excited to generate active free radicals under ultraviolet photocatalysis.

[0032] The oxidant and the active free radicals are driven to flow out of the container from the annular gap cavity through a number of through holes, so as to purify and disinfect the water outside the container.

[0033] In this scheme, the ultraviolet photocatalysis generated by the above method can effectively excite high concentrations of active free radicals, improving the water purification and disinfection effect and efficiency compared to the decomposition of pollutants by ultraviolet photolysis alone or by individual oxides. By injecting one or more oxides into the annular gap cavity between the existing ultraviolet lamp sleeve and the container, active free radicals are concentratedly excited in this annular gap cavity under the combined action of ultraviolet lamp radiation, catalyst photocatalysis, and oxides. The concentrated oxides are continuously acted upon by ultraviolet light and catalysts in this annular gap cavity, efficiently generating active free radicals, which then flow out from the through holes on the side wall of the container, thereby achieving efficient purification and enhanced disinfection of the water outside the container. By injecting at least one oxidant into the annular gap cavity, the ultraviolet lamp sleeve and the water outside the container are separated, avoiding direct contact between the ultraviolet lamp sleeve and the water to be treated. This prevents the outer wall of the container from heating up, fundamentally avoiding high-temperature scaling of pollutants in the water on the ultraviolet lamp sleeve, making the ultraviolet lamp sleeve easy to clean. Furthermore, the injected oxidant and the excited high concentration of active free radicals have a good cleaning effect on the UV lamp sleeve and the container sidewalls. Because the impact of scaling on the UV photocatalytic reaction is reduced, the power consumption of the UV lamp sleeve during operation is also lowered, resulting in lower power consumption.

[0034] Preferably, the low-power, high-efficiency ultraviolet photocatalytic oxidation method further includes the following steps:

[0035] The oxidant is split into multiple streams, and these streams are driven to be injected into the annular gap cavity from different axial positions outside the container.

[0036] Preferably, the low-power, high-efficiency ultraviolet photocatalytic oxidation method further includes the following steps:

[0037] The oxidant is split into multiple streams, and these streams are driven to be injected radially into the annular gap cavity from different locations outside the container.

[0038] In this solution, the oxidant is diverted outside the container using the two methods described above and injected into the annular gap cavity at different positions along the axial or radial direction of the container. This avoids excessive or insufficient oxidant flow at a certain position, which would affect the uniformity of the excitation of active free radicals, thereby improving the overall water purification and disinfection efficiency of the container.

[0039] Preferably, the step of "injecting at least one oxidant into the annular gap cavity between the UV lamp sleeve and the container" further includes the following step:

[0040] The oxidant in the annular gap cavity is further distributed within the annular gap cavity, and the distributed oxidant is driven to flow evenly in the annular gap cavity to different positions of the ultraviolet lamp sleeve along the radial and / or axial directions, and flows out evenly from the through holes opened in the side wall of the container.

[0041] In this scheme, the oxidant is evenly distributed inside the container through the above method. Compared with the oxidant being diverted outside the container, the diffusion distance of the oxidant is shortened, and it can be irradiated by ultraviolet light more quickly. It also ensures that the concentration of active free radicals flowing out of the through holes opened at different locations in the container is similar, rather than some locations having high concentrations and some locations having low concentrations or even no active free radicals being generated. This is beneficial to the excitation efficiency of active free radicals.

[0042] Preferably, the low-power, high-efficiency ultraviolet photocatalytic oxidation method further includes the following steps:

[0043] The concentration of pollutants in the water is monitored at different locations on the sidewall and outside of the container, and / or the irradiance of the ultraviolet lamp is monitored.

[0044] Accordingly, the flow rate of the oxidant injected into the annular gap cavity is adjusted, and / or the radiation intensity of the ultraviolet lamp is adjusted.

[0045] In this scheme, by monitoring the pollutant concentration in the water at different locations on the sidewall and outside of the container, the amount of oxidant injected can be adjusted (the higher the pollutant concentration, the greater the amount of oxidant injected), and / or the radiation intensity of the ultraviolet lamp can be adjusted (the higher the pollutant concentration, the greater the radiation intensity of the ultraviolet lamp), so that the pollutants can be decomposed in a timely manner, ensuring effective water purification and disinfection.

[0046] Preferably, the low-power, high-efficiency ultraviolet photocatalytic oxidation method further includes the following steps:

[0047] Multiple containers are arranged parallel to each other in the water body, and the concentration of pollutants is monitored at different locations on the sidewalls and outer sides of the containers, as well as the irradiation intensity of the ultraviolet lamps.

[0048] In this scheme, for multiple containers spaced apart, the ultraviolet irradiance intensity at the sidewalls and outer sides of the containers is monitored, and the power of the corresponding ultraviolet lamps is adjusted to ensure that the ultraviolet radiation intensity at the inner wall of the containers can meet the conditions for the oxidant to generate a large number of active free radicals under ultraviolet photocatalysis.

[0049] Preferably, the low-power, high-efficiency ultraviolet photocatalytic oxidation method further includes the following steps:

[0050] The midpoint between the central axes of two adjacent ultraviolet lamps set diagonally opposite each other is set as the control point;

[0051] Monitor the ultraviolet irradiance intensity at the control point and adjust the power of the ultraviolet lamp.

[0052] In this scheme, the ultraviolet radiation intensity at the control point is monitored and the power of the corresponding ultraviolet lamps is adjusted to ensure that the ultraviolet radiation intensity at the control point meets the basic disinfection conditions of the water body.

[0053] Preferably, the low-power, high-efficiency ultraviolet catalytic oxidation method further includes the following steps:

[0054] The various oxidants are mixed and then injected into the annular gap cavity.

[0055] In this scheme, compared to using a single oxidant, mixing multiple different oxidants and then injecting them into the annular gap cavity helps to enhance the chemical reaction between the multiple oxidants, increase the rate of generating active free radicals, and further improve the disinfection and purification efficiency of the water.

[0056] The positive and progressive effects of this invention are as follows:

[0057] (1) By injecting water and oxides together into the annular gap cavity between the UV lamp sleeve and the new container, active free radicals are generated efficiently and continuously in this annular gap cavity. After the high concentration of active free radicals flows out from the through holes opened on the side wall of the container, they will produce a highly efficient purification and enhanced disinfection effect on the water outside the container, which can completely offset the slight loss that occurs when the ultraviolet light is transmitted or refracted out of the container (active free radicals and various oxidants have a further killing effect on microorganisms in the water). Overall, it can significantly improve the water purification and disinfection efficiency.

[0058] (2) By injecting at least one oxidant into the annular gap cavity between the UV lamp sleeve and the container, the UV lamp sleeve and the water outside the container are separated, avoiding direct contact between the UV lamp sleeve and the water being treated. This prevents the outer wall of the container from heating up, fundamentally avoiding high-temperature scaling of pollutants in the water on the UV lamp sleeve, making the UV lamp sleeve easy to clean. Furthermore, the injected oxidant and the activated high-concentration active free radicals have a good cleaning effect on both the UV lamp sleeve and the sidewall of the container. Attached Figure Description

[0059] Figure 1 This is a schematic diagram of the water purification device according to an embodiment of the present invention.

[0060] Figure 2 The following is a flowchart of the low-power, high-efficiency ultraviolet photocatalytic oxidation method according to an embodiment of the present invention. Figure 1 .

[0061] Figure 3 The following is a flowchart of the low-power, high-efficiency ultraviolet photocatalytic oxidation method according to an embodiment of the present invention. Figure 2 .

[0062] Figure 4 This is a graph showing the relationship between irradiation intensity and the internal spacing of the ultraviolet lamp sleeve in an embodiment of the present invention.

[0063] Figure 5 This is Python code for fitting the relationship between ultraviolet irradiation intensity and the distance between the inner walls of the ultraviolet lamp sleeve in an embodiment of the present invention.

[0064] Explanation of reference numerals in the attached figures:

[0065] Water purification device 1

[0066] Container 2

[0067] UV lamp sleeve 3

[0068] Oxidizing agent input device 4

[0069] Delivery pipe 5 Detailed Implementation

[0070] The present invention will be further illustrated by way of embodiments below, but the present invention is not limited to the scope of the embodiments described herein.

[0071] This embodiment provides a low-power, high-efficiency ultraviolet photocatalytic oxidation method. This method uses a water purification device 1 for water purification, such as... Figure 1As shown, the water purification device 1 includes a container 2, an ultraviolet lamp sleeve 3, and an external oxidant input device 4 (containing two oxidants: hydrogen peroxide and chlorine dioxide). The container 2 is specifically a porous transparent tube, with several through holes on its side wall. The ultraviolet lamp sleeve 3 is fitted inside the container 2, and the two are coaxially arranged. The oxidant input device 4 inputs the oxidant into the annular gap cavity between the ultraviolet lamp sleeve 3 and the container 2 through a delivery pipe 5. The surface of the container is coated with various ultraviolet photocatalysts such as titanium dioxide and black titanium.

[0072] like Figure 2 As shown, this low-power, high-efficiency ultraviolet photocatalytic oxidation method includes the following steps:

[0073] S1. The oxidant input device 4 injects oxidant (hydrogen peroxide and chlorine dioxide) into the annular gap cavity (1.0 cm wide) between container 2 and ultraviolet lamp sleeve 3 through the delivery pipe 5.

[0074] S2. Turn on the ultraviolet lamp. The ultraviolet light emitted and the ultraviolet photocatalyst coated on the side wall of container 2 (e.g., one or more of black titanium, titanium dioxide, zinc oxide, tin oxide or zirconium dioxide) work together to produce ultraviolet photocatalysis, so that the oxidant can be excited to generate active free radicals under ultraviolet photocatalysis.

[0075] S3 drives hydrogen peroxide, chlorine dioxide, and activated free radicals to flow out of the container through several through holes from the annular gap cavity, thereby purifying and disinfecting the water outside the container.

[0076] In water, ultraviolet light alone can directly photodegrade organic matter, and oxidants alone can also react with organic matter, but the decomposition efficiency is relatively low. In this embodiment, the ultraviolet light, under the action of a catalyst, generates ultraviolet photocatalysis, effectively stimulating oxides to produce high concentrations of active free radicals. Compared to ultraviolet photodegradation alone or the decomposition of pollutants by oxides alone, this improves water purification and disinfection efficiency. Furthermore, the active free radicals purify and disinfect the water, thereby enhancing the purification and disinfection efficiency. By injecting hydrogen peroxide and chlorine dioxide into the annular gap cavity between container 2 and the ultraviolet lamp sleeve 3 coaxially disposed within container 2, high concentrations of active free radicals are continuously stimulated in this annular gap cavity under the radiation of the ultraviolet lamp, improving the efficiency and effectiveness of water purification and disinfection. By injecting various oxidants into the annular gap cavity, the UV lamp sleeve 3 and the water outside the container 2 are separated, avoiding direct contact between the UV lamp sleeve 3 and the treated water. This prevents the outer wall of the container 2 from heating up easily, fundamentally preventing high-temperature scaling of pollutants in the water on the UV lamp sleeve, making the UV lamp sleeve 3 easy to clean. Furthermore, the injected oxidants and the activated high-concentration active free radicals have a good cleaning effect on both the UV lamp sleeve 3 and the sidewalls of the container 2.

[0077] Among them, such as Figure 3 As shown, this low-power, high-efficiency ultraviolet photocatalytic oxidation method may further include the following steps before step S1:

[0078] S01. The oxidant is divided into 3 streams and injected into the annular gap cavity between the ultraviolet lamp outer tube sleeve 3 and the container 2 from 3 different positions along the axial direction outside the container 2.

[0079] Through the above method, the oxidant is diverted outside the container 2 and injected into the annular gap cavity between the ultraviolet lamp sleeve 3 and the container 2 at different positions along the axial direction of the container 2. This avoids the oxidant flow rate at a certain position being too high or too low, which would affect the uniformity of the excitation of active free radicals, thereby improving the overall water purification and disinfection efficiency of the water purification device 1.

[0080] In other embodiments, the multiple streams of oxidant can also be injected into the annular gap cavity from different radial positions outside the container 2, in which case step S01 above can be changed to:

[0081] The oxidant is split into multiple streams and driven to be injected radially from different positions outside the container into the annular gap cavity.

[0082] This method can also prevent the oxidant flow rate at a certain location from being too high or too low, which would affect the uniformity of the excitation of active free radicals, thereby improving the overall water purification and disinfection efficiency of the water purification device 1.

[0083] This low-power, high-efficiency ultraviolet catalytic oxidation method may also include the following steps before step S1:

[0084] S02. The oxidant in the annular gap cavity is further distributed in the annular gap cavity by the distributor, and the distributed oxidant is driven to flow evenly in the annular gap cavity to different positions along the radial and / or axial direction of the ultraviolet lamp sleeve 3, and flows out evenly from the through hole opened in the side wall of the container 2.

[0085] Through the above method, the oxidant is evenly distributed inside container 2. Compared with the oxidant being diverted outside container 2, the diffusion distance of the oxidant is shortened, and it can be irradiated by ultraviolet light more quickly. It also ensures that the concentration of active free radicals flowing out of the through holes at different locations in container 2 is similar, rather than some locations having high concentrations and others having low concentrations or even no active free radicals being generated. This is beneficial to the excitation efficiency of active free radicals.

[0086] This low-power, high-efficiency ultraviolet photocatalytic oxidation method may also include the following steps before step S1:

[0087] S03. Monitor the pollutant concentration in the water at different locations on the sidewall and outer side of container 2, and / or monitor the irradiance of the ultraviolet lamp. Accordingly, adjust the flow rate of the oxidant injected into container 2, and / or adjust the radiation intensity of the ultraviolet lamp.

[0088] By monitoring the concentration of pollutants in the water at different locations on the sidewall and outer side of container 2, the amount of oxidant injected can be adjusted (the higher the pollutant concentration, the greater the amount of oxidant injected), or the radiation intensity of the ultraviolet lamp can be adjusted (the higher the pollutant concentration, the greater the radiation intensity of the ultraviolet lamp), or both the amount of oxidant injected and the radiation intensity of the ultraviolet lamp can be adjusted simultaneously, so that pollutants are decomposed in a timely manner, ensuring effective water purification and disinfection.

[0089] In other embodiments, when multiple UV lamp sleeves 3 and containers 2 are spaced apart in a parallel manner within the water body, the low-power, high-efficiency UV photocatalytic oxidation method may further include the following steps:

[0090] S04. Four ultraviolet lamp sleeves 3 and container 2 are placed in the water body in a parallel manner. The concentration of pollutants is monitored at different positions on the side wall and outside of container 2, and the irradiance of the ultraviolet lamps is also monitored.

[0091] S05. For the four spaced UV lamp sleeves 3 and containers 2, the midpoint between the central axes of two adjacent diagonally opposite UV lamps is set as the control point. In this embodiment, the distance between the control point and the adjacent UV lamp sleeve 3 is 128cm. By monitoring the UV irradiance of the control point and adjusting the power of the corresponding UV lamp, the UV radiation intensity of the control point can be guaranteed to meet the basic disinfection conditions of the water body.

[0092] By monitoring the ultraviolet irradiance intensity at the inner wall of container 2 and adjusting the power of the corresponding ultraviolet lamp, the ultraviolet radiation intensity at the inner wall of container 2 can meet the conditions for the oxidant to generate a large number of active free radicals under ultraviolet photocatalysis.

[0093] In this embodiment, the factory-rated irradiance at the outer wall of the ultraviolet lamp sleeve 3 is 25000 W / m. 2 The formula for the attenuation of the irradiance of a linear ultraviolet lamp in water is as follows, and its linear attenuation coefficient in water is 1m. -1 .

[0094]

[0095] in:

[0096] I′ — Illuminance at the observation point (lx, or W / m2)

[0097] E0 / L — Luminous flux per unit length of the lamp (lm / m, or W / m)

[0098] μ—the linear attenuation coefficient of light in water, typically >1 (m⁻¹).

[0099] r — Distance from the outer wall of the lamp tube to the observation point (m)

[0100] l — the variable in the calculus, from 0 to L1, or from 0 to L2(m).

[0101] L — Total length of the lamp tube (m)

[0102] Based on the above formula, the relationship curve between the ultraviolet irradiance intensity monitored by the probe and the distance between the inner walls of the ultraviolet lamp sleeve was fitted using Python programming, as shown below. Figure 4 As shown (Python encoding as shown) Figure 5 (As shown in the figure). In the above formula, the illuminance of I′ represents the radiation intensity of the ultraviolet lamp.

[0103] like Figure 4 As shown, the irradiance monitored at the outer wall of the UV lamp sleeve 3 (wall thickness 0.1cm) was 25000W / m. 2 The irradiation intensity is high, which can directly photolyze the water, generating a large number of active free radicals; the irradiation intensity monitored at the inner wall of container 2 (the gap between the inner wall of container 2 and the outer wall of the ultraviolet lamp sleeve 3 is 1.0 cm) is 2617 W / m². 2 This irradiation intensity enables the oxidant to generate a large number of active free radicals under ultraviolet photocatalysis; the irradiation intensity monitored at a control point outside container 2 (128.0 cm from the inner wall of the ultraviolet lamp sleeve) was 569 W / m². 2 This irradiation intensity is sufficient to inactivate viruses, bacteria, and other microorganisms in water under ultraviolet light irradiation.

[0104] For the four spaced-apart UV lamp sleeves 3 and the container 2, after the system has been running for 10 days, this embodiment also includes the following steps:

[0105] S06. The radiation intensity monitored at the outer wall of the UV lamp sleeve 3 (wall thickness 0.1cm) decreased to 20300W / m. 2 The irradiation intensity remains high and can directly photolyze the water, generating a large number of reactive free radicals; the irradiation intensity monitored at the inner wall of container 2 (the gap between the inner wall of container 2 and the outer wall of the UV lamp sleeve 3 is 1.0 cm) is 1917 W / m². 2 The irradiation intensity is insufficient to cause the oxidant to generate a large number of active free radicals under ultraviolet photocatalysis.

[0106] S07. Increase the amount of oxidant injected, and clean the outer wall of the UV lamp sleeve 3 and the side wall of the container 2. After cleaning, the irradiance at the inner wall of the container 2 was monitored to reach 2059 W / m².2 However, this is still insufficient to enable the oxidant to generate a large number of active free radicals under ultraviolet photocatalysis.

[0107] S08. Increase the power of the ultraviolet lamp so that the monitoring irradiance at the inner wall of container 2 reaches 2500W / m. 2 The irradiation intensity is just enough to enable the oxidant to generate a large number of active free radicals under ultraviolet photocatalysis.

[0108] S09. The irradiance monitored at a control point outside the container 2 (128.0 cm from the inner wall of the UV lamp sleeve) is 406 W / m². 2 The intensity of this irradiation is insufficient to inactivate viruses, bacteria, and other microorganisms in the water under ultraviolet light irradiation.

[0109] S10. Increase the power of the ultraviolet lamp so that the irradiance monitored at the control point outside the container 2 (128.0 cm away from the inner wall of the ultraviolet lamp sleeve) is 500 W / m. 2 The intensity of this irradiation is just enough to inactivate viruses, bacteria, and other microorganisms in the water under ultraviolet light irradiation.

[0110] While specific embodiments of the present invention have been described above, those skilled in the art should understand that these are merely illustrative examples, and the scope of protection of the present invention is defined by the appended claims. Those skilled in the art can make various changes or modifications to these embodiments without departing from the principles and essence of the present invention, but all such changes and modifications fall within the scope of protection of the present invention.

Claims

1. A low-power-consumption high-efficiency ultraviolet photocatalytic oxidation method, using an ultraviolet disinfection device to purify and disinfect water flowing through the ultraviolet disinfection device, characterized in that, The ultraviolet disinfection device comprises a container and an ultraviolet lamp sleeve arranged in the container, the ultraviolet lamp sleeve comprises an outer sleeve and an ultraviolet lamp arranged in the outer sleeve, a plurality of through holes are arranged in the side wall of the container, and the low-power high-efficiency ultraviolet photocatalytic oxidation method comprises the following steps: The oxidant is divided into multiple streams, and the multiple streams of the oxidant are injected into the annular gap cavity between the ultraviolet lamp sleeve and the container from different axial positions outside the container, or the multiple streams of the oxidant are injected into the annular gap cavity from different radial positions outside the container; The oxidant in the annular gap cavity is further distributed in the annular gap cavity, and the distributed oxidant is uniformly flowed to different positions of the ultraviolet lamp sleeve in the radial direction and / or in the axial direction in the annular gap cavity; the ultraviolet lamp is started, and the ultraviolet light radiated and the catalyst coated on the side wall of the container jointly produce ultraviolet photocatalysis to excite active free radicals from the oxidant under the ultraviolet photocatalysis; The oxidant and the active free radicals are caused to flow out of the container from the annular gap cavity through the plurality of through holes to purify and disinfect the water body outside the container.

2. The low power consumption high performance ultraviolet photocatalytic oxidation method according to claim 1, wherein, The low-power high-efficiency ultraviolet photocatalytic oxidation method further comprises the following steps: The pollutant concentration of the water body is monitored at different positions of the inner wall and the outer side of the container, and / or the irradiation intensity of the ultraviolet lamp is monitored.

3. The method of claim 2, wherein the ultraviolet photocatalytic oxidation is performed at a temperature of 20 to 80°C, a relative humidity of 30 to 90%, and a light intensity of 100 to 1000 μW / cm2. The low-power high-efficiency ultraviolet photocatalytic oxidation method further comprises the following steps: The flow of the oxidant injected into the annular gap cavity is adjusted, and / or the radiation intensity of the ultraviolet lamp is adjusted.

4. The method of claim 1, wherein the low power consumption and high efficiency UV photocatalytic oxidation is characterized by, The low-power high-efficiency ultraviolet photocatalytic oxidation method further comprises the following steps: A plurality of the containers are arranged in parallel at intervals in the water body, and the pollutant concentration at different positions of the side wall and the outer side of the container is monitored, and the irradiation intensity of the ultraviolet lamp is monitored.

5. The method of claim 4, wherein the low power consumption and high efficiency UV photocatalytic oxidation is characterized by, The low-power high-efficiency ultraviolet photocatalytic oxidation method further comprises the following steps: According to the monitored ultraviolet light irradiation intensity at the inner wall of the container, the power of the ultraviolet lamp is adjusted.

6. The method of claim 4, wherein the low power consumption and high efficiency ultraviolet photocatalytic oxidation is characterized by, The low-power high-efficiency ultraviolet photocatalytic oxidation method further comprises the following steps: A midpoint between the central axes of two adjacent ultraviolet lamps arranged in a diagonal manner is set as a control point; The ultraviolet light irradiation intensity of the control point is monitored, and the power of the ultraviolet lamp is adjusted.

7. The low-power, high-efficiency ultraviolet photocatalytic oxidation method as described in claim 1, characterized in that, The low-power high-efficiency ultraviolet photocatalytic oxidation method further comprises the following steps: Multiple different oxidants are mixed and then injected into the annular gap cavity.

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