KR20200028611A - Ultra Violet Sterilizing Apparatus using Lens Array - Google Patents

Abstract

The ultraviolet sterilization device of the present invention comprises an ultraviolet lamp unit for irradiating ultraviolet light to water to be treated, and a reflecting unit for reflecting ultraviolet light passing through the water to be treated. The reflecting unit can include a plurality of nano-sized concave lenses formed by anodizing treatment on an aluminum plate, and the diameter and number of each lens are formed to form a plurality of foci as ultraviolet light reflected from each different lens gathers in the water to be treated. Since the ultraviolet light irradiated as an object to be sterilized and disinfected is reflected through the lens array and again forms a focus in the water, the sterilization power can be improved by increasing both the irradiation time and the dose of ultraviolet light.

Description

Ultraviolet Sterilizing Apparatus using Lens Array}

The present invention relates to a device for sterilizing ultraviolet rays, and more particularly, to a device capable of more effectively sterilizing water to be treated, such as drinking water or sewage, using a plurality of lenses that reflect ultraviolet rays.

Ultraviolet rays (UV) are frequently used for sterilization and disinfection of viruses, bacteria, and fungi in water to be treated.

UV irradiation induces lesions in genomic DNA, including the formation of pyrimidine dimers between adjacent pyrimidines on the same DNA strand. When such a DNA lesion appears, RNA synthesis and DNA replication cannot be performed, and growth and proliferation are inhibited.

Inactivation of various microorganisms by ultraviolet irradiation depends on both the ultraviolet wavelength and the dose, and DNA absorbs more ultraviolet energy at wavelengths near 260 nm than at higher wavelengths.

Therefore, a greater number of pyrimidine dimers are found in plasmid DNA irradiated by UVC (200 nm to 280 nm) than UVB (280 nm to 320 nm) or UVA (320 nm to 400 nm).

UVC is more effective at deactivating microorganisms than UVB and UVA, so UVC is generally applied to ultraviolet-based sterilization treatment.

The effect of UV deactivation is known to depend on the duration of UV irradiation, and when E. coli and the like are exposed to UVC for a long time, the pyrimidine dimer in DNA increases and the survival rate decreases.

The ultraviolet dose dependence associated with microbial inactivation has been extensively studied and summarized in several papers. In addition, the UV dose required to inactivate various microorganisms has been documented by manufacturers of UV-based water treatment systems.

For example, it has been reported that doses of 5, 9, 14, and 18 mJ cm ^-2 at 260 nm wavelength, respectively, are required to reduce 90%, 99%, 99.9%, and 99.99% of E. coli in water through UV irradiation. It is done.

On the other hand, there are various types of microorganisms contaminating water, such as viruses, bacteria, and protozoa, and they are randomly distributed in water, and their sizes vary from 20 to 1,000 nm, 1 to 8 μm, and 10 to 50 μm.

Therefore, in order to improve the effect of UV deactivation, the size and distribution of microorganisms in water must be considered.

In addition, the deactivation effect of microorganisms using ultraviolet rays can be improved by concentrating ultraviolet rays on microorganisms in water.

In this regard, a method of reflecting ultraviolet rays back into water by disposing a reflective metal sheet may be considered. However, since it is difficult to expect an ultraviolet concentration effect on microorganisms in water in a planar ultraviolet reflector, a method of effectively concentrating ultraviolet rays is required.

Accordingly, the present invention has been devised to meet the above needs, and an object thereof is to provide an ultraviolet sterilization device capable of improving sterilization and disinfection effects by concentrating ultraviolet light on microorganisms in water using a lens array.

In order to achieve the above object, an ultraviolet sterilization apparatus using a lens array according to the present invention includes: an ultraviolet lamp unit that irradiates ultraviolet light on water to be treated; And a reflecting part that reflects the ultraviolet light passing through the water to be treated back to the water to be treated, and the reflecting part includes a plurality of lenses.

The lens may include at least one of a concave lens and a convex lens.

The ultraviolet lamp unit may irradiate ultraviolet light from the outside of the water tank temporarily storing the water to be treated, and the reflective unit may be arranged to face the ultraviolet lamp unit outside the water tank.

The reflector may be configured using an aluminum plate, and may include a plurality of concave lenses formed through anodizing treatment on the aluminum plate.

The lens may be formed through anodization made by supplying a voltage of 60 V in fisheries.

The diameter of the lens may be composed of 85nm or more and 95nm or less.

The number of lenses may be 156 / μm ² or more and 166 / μm ² or less.

The diameter and number of the lenses may be configured such that ultraviolet rays reflected from different lenses gather in the water to be treated to form a plurality of focal points.

At this time, the horizontal distance between the focal points may be configured to be 1 μm or less.

In the present invention, the ultraviolet light irradiated as the object of sterilization and disinfection is reflected through the lens array to form several focal points in water again. Accordingly, it is possible to increase both the irradiation time and the dose of ultraviolet light, thereby improving the sterilizing power.

1 is an embodiment of an ultraviolet sterilization device according to the present invention,
2 is an example for explaining that the ultraviolet rays reflected from each lens form focus again in the water,
Figure 3 is an example for explaining the process of forming a plurality of concave lenses through anodization for aluminum,
4 is an example of an experimental apparatus according to the present invention,
5 is an example for explaining ultraviolet reflection at each interface,
Figure 6 is an example of the actual appearance of the lens array formed by anodization,
7 is an example of the relationship between the diameter and the number of lenses,
8 and 9 are examples for explaining the sterilizing effect according to the anodic oxidation conditions used to form a lens,
10 is an example of focus formed by ultraviolet rays reflected from individual lenses,
11 and 12 are examples in which ultraviolet rays reflected from various lenses gather to form a focus,
13 is an example showing a lens size according to anodization conditions of aluminum.

The present invention can be applied to a variety of transformations and may have various embodiments, and specific embodiments will be illustrated in the drawings and described in detail in the detailed description.

However, this is not intended to limit the present invention to specific embodiments, and should be understood to include all conversions, equivalents, and substitutes included in the spirit and scope of the present invention.

In the description of the present invention, when it is determined that a detailed description of known technologies related to the present invention may obscure the subject matter of the present invention, the detailed description will be omitted.

The terms used in this application are only used to describe specific embodiments, and are not intended to limit the present invention. Singular expressions include plural expressions unless the context clearly indicates otherwise. In this application, the terms "include" or "have" are intended to indicate the presence of features, numbers, steps, actions, components, parts or combinations thereof described herein, one or more other features. It should be understood that the existence or addition possibilities of fields or numbers, steps, operations, components, parts or combinations thereof are not excluded in advance.

1 shows an embodiment of an ultraviolet sterilization apparatus 100 using a lens array according to the present invention, an ultraviolet lamp unit 110 irradiating ultraviolet rays 111 to water (220) to be treated And, it comprises a reflector 120 for reflecting the ultraviolet light that has passed through the water to be treated 220 back to the water to be treated 220.

The wavelength of ultraviolet light irradiated by the ultraviolet lamp unit 110 may be variously configured.

As a specific example, it may be configured to irradiate ultraviolet (UVC) having a wavelength of 200 nm to 280 nm, but is not limited thereto.

The reflector 120 serves to reflect the ultraviolet light that has passed through the target water 220 back to the target water. In particular, the reflector 120 includes a plurality of lenses capable of reflecting ultraviolet rays.

The lens can be configured in various ways. For example, each lens may consist of a concave lens or a convex lens.

When the reflector 120 is composed of a plurality of lenses, ultraviolet rays irradiated from the ultraviolet lamp unit 110 are reflected from each lens, and thus a focus can be formed in the water 220 to be treated. Accordingly, it is possible to improve the sterilization and disinfection effect by concentrating the dose of ultraviolet rays at the location.

2 shows that the ultraviolet rays reflected from the plurality of concave lenses form the focal point F in the water to be treated, and shows that the ultraviolet rays reflected from the plurality of lenses are concentrated at each focus to increase the dose. Although the reference symbol 'F' is displayed only in one of the focal points, it can be seen that several focal points are formed.

The position of the focal point F may depend on factors such as the diameter and number of lenses, and these factors may be appropriately adjusted as needed.

The water 220 to be treated as a target of sterilization and disinfection may be water used for various purposes such as drinking water or wastewater (sewage), and may be sterilized and sterilized in various conditions as necessary.

1 shows an example of sterilization and disinfection treatment in a state in which the water to be treated 220 is contained in the water tank 210.

The UV lamp unit 110 may be variously disposed in relation to water to be treated.

For example, the ultraviolet lamp unit 110 is arranged to irradiate ultraviolet light from the outside of the water tank 210 to the water 220 to be treated in the water tank 210, and the reflector 120 is provided with the ultraviolet lamp unit 110. It can be arranged to face each other.

At this time, the ultraviolet light that has passed through the water to be treated 220 is incident on the reflector 120, and the portion of the water tank through which the ultraviolet light reflected from the reflector 120 goes back to the water 220 to be treated is made of a transparent material. As a specific example, if the ultraviolet lamp unit 110 is disposed on the upper side of the water tank 210 and irradiates the ultraviolet light 111 vertically to the water 220 to be disposed below, the reflector 120 is the water tank 210 ) May be disposed under the bottom surface, and at least the bottom surface of the water tank 210 is configured to be transparent.

The diameter and the number of lenses constituting the reflector 120 are configured such that ultraviolet rays reflected from each lens form at least one focus in water to be treated.

The focal length may be configured as a distance from a few micrometers to a few millimeters depending on the overlap of ultraviolet rays reflected by a plurality of lenses.

In addition, the horizontal distance between each focal point may be variously configured, and may be determined in relation to the size of an object to be sterilized and disinfected. For example, if the size of the object to be sterilized is in micrometers, the horizontal distance between the focal points may be configured to be 1 μm or less.

The reflector 120 having various lenses may be manufactured in various ways.

As a specific example, the reflector 120 may be configured using an aluminum plate. By performing anodizing treatment on the aluminum plate, an aluminum plate having a plurality of fine concave lenses can be obtained. At this time, the diameter and number of lenses may be determined according to the type of acidic solution used for anodizing treatment and the applied voltage.

3A shows the detailed structure of the anodized aluminum oxide film, and when anodizing aluminum, the surface structure is composed of several cells, and since the lower part of each cell represents a curved surface, it can be processed into a concave lens using the same. .

3B shows the process of aluminum anodization, and since aluminum reacts electrochemically, the surface can be electrochemically polished to finish like a mirror (electrolytic polishing). In addition, the aluminum surface can be made of a nano-porous structure having nano-pores arranged in a hexagon through anodization, which applies voltage under acidic conditions.

The nanopores arranged in a hexagon on the aluminum plate by anodizing treatment may be formed by an electrochemical process related to the growth and partial dissolution of aluminum oxide. That is, by anodizing aluminum in an acidic environment, cylindrical nano-holes having a hemispherical bottom are formed in the center of the cell.

The size of the cell and nano-holes of Anodic Aluminum Oxide (AAO) depends on the electrolyte and voltage used.

Anodizing of aluminum in oxalic acid and phosphoric acid produces nanoporous aluminum with nanopores with diameters of 20-100 nm and 20-500 nm, respectively.

Anodization treatment in phosphoric acid can produce larger cells than those formed by anodization treatment in oxalic acid, and the size of cells and nano-pores on anodized aluminum (AAO) is positively correlated with anodization voltage. .

Then, by removing anodized aluminum (AAO) using a chemical solution that selectively reacts with aluminum oxide, a hemispherical nano-lens array as shown in FIG. 3C can be obtained.

In the case of forming the lenses using aluminum anodization, the type of the acidic solution and the voltage applied to the aluminum plate affect the lens formation, and a difference in sterilization efficiency occurs depending on the size and number of lenses.

In order to obtain a high sterilization effect, the lens may be formed through an anodic oxidation process made by supplying a voltage of 60 V in fisheries. In addition, the diameter of the lens is composed of 85nm or more and 95nm or less, and the number of lenses may be composed of 156 / μm ² to 166 / μm ² .

According to the experimental results below, when each lens is configured in a nano size, the improvement of the ultraviolet sterilization efficiency according to the application of the lens array may be caused by condensation of ultraviolet rays reflected from different lenses rather than amplification of ultraviolet rays by a single lens.

Hereinafter, an experimental example in which the lens provided in the reflector 120 has a nano size will be described in detail. However, the following experimental examples are for illustrative purposes only and are not intended to limit the scope of the present application.

[Experimental Example]

1. Materials and Methods

1.1. Nano Lens Preparation

The aluminum-based nanolens was produced by electrolytic polishing, anodization, and chemical processing for selective dissolution of aluminum oxide.

To clean the surface of aluminum (alloy 1050) cut into a rectangle (15 mm × 80 mm), the aluminum was degreased in an ultrasonication bath (acetation bath, Branson 3800, Branson, Danbury, CT, USA) containing acetone, and then distilled water. Rinse with and then dry.

Aluminum electropolishing and anodizing are regulated DC power supply (HYP-12005D, Han Young Electronic, Incheon, Korea), anode clamp, carbon electrode (40mm × 100mm; Moon Hwa Titan Art, Incheon, Korea), double A processing system consisting of a beaker and a circulating constant-temperature bath (CCA-112A, Eyela, Tokyo, Japan) was used.

For aluminum electropolishing, place the aluminum strip on the anode in a double beaker filled with an electropolishing solution consisting of ethyl alcohol, ethylene glycol, perchloric acid, and water (71: 10: 7: 12), and for 40 seconds at 5 ° C on the aluminum strip. This was achieved by supplying 42.5V of electricity.

Thereafter, the electrolytically polished aluminum strip was wiped off with distilled water and stored by drying. For the anodic oxidation of aluminum, electropolished aluminum was placed on the anode of the processing system, and DC electricity was supplied for 1 minute in a 0.3M hydroxy or 1M phosphoric acid solution.

For anodization using 0.3M oxalic acid, voltages of 40V, 60V, and 80V were supplied, and for anodization using 1.0M phosphoric acid, voltages of 80V, 100V, and 120V were supplied.

The anodized aluminum was washed with distilled water, dried and stored. In order to remove the aluminum oxide film formed on the aluminum surface through anodization, the anodized aluminum was immersed in a solution (65 ° C) consisting of 0.15M chromic acid and 0.6M phosphoric acid for about 8 hours.

1.2. E.coli O157: H7 UV sterilization using nano lens

Referring to FIG. 4, the reflector 120 including the nano-lens array produced electrochemically is placed on the outer bottom of the quartz beaker 230 having a thickness of 2 mm, and about 5-6 log CFU is placed in the quartz beaker 230. 50 mL of distilled water containing E. coli O157: H7 ATCC 35150 at mL- ¹ level was added to the quartz beaker 230.

In addition, E. coli O157: H7 sterilization contained in distilled water was induced by irradiating ultraviolet rays (UVC; 254 nm) with stirring using a magnetic stirrer 240.

The distance between the UV lamp unit 110 and the surface of distilled water is about 270 mm, and for the safety of the experimenter, UV sterilization was performed inside the black acrylic box.

1 mL of E. coli O157: H7 distilled water was collected every 5 seconds during a total of 35 seconds of UV sterilization, and after diluting the collected sample, it was smeared on a tryptic soy agar plate (TSA; Difco, BD, Sparks, MD, USA) After culturing, the number of viable E. coli O157: H7 cells in distilled water was measured. The E. coli O157: H7 UV sterilization experiment using nanolenses was repeated three times.

During this experiment, the experimental results of E.coli O157: H7 sterilized by ultraviolet irradiation for 15 seconds were analyzed for the sterilization effect through statistical processing using one-way batch analysis (ANOVA) and Tukey's honestly significant difference test (P <0.05). Statistical significance was verified.

Additionally, the UV transmittance of the quartz beaker 230 was analyzed using a radiation meter (VLX-3X, Vilber Lourmat, Collegien, France) with a UVC (254 nm) sensor attached.

1.3. Surface analysis of nanolens surface

A scanning probe microscope (SPM; Easyscan 2, Nanosurf AG, Liestal, Stitzerland) was used to analyze the surface of the nanolens array at the nanometer level, and the surface analysis was performed in a 'tapping mode'.

In addition, a 1.6 N / m level spring constant cantilever (Applied Nanostructures, Mountain View, CA, USA) was used.

Data obtained with SPM for analysis of surface roughness of nanolens, diameter of nanolens, and number of nanolenses were processed using SPIP software (Version 6.7.3, Image Metrology, Lyngby, Dnmark). This analysis was conducted three times.

1.4. UV reflection and refraction simulation

Through SPM analysis, 2-D coordinates (x, z) for the surface topography of the nanolens could be obtained, and the angle (θ ₁ ) of the instantaneous slope and inclination of the surface of the nanolens using continuous coordinates can be obtained from the following equation. It was calculated as 1 (Fig. 5).

Since it is assumed that the ultraviolet light emitted from the ultraviolet lamp 110 reaches the nanolens perpendicularly, θ ₁ is calculated to be the same as the incident angle and reflection angle of ultraviolet light to the nanolens. In addition, the reflection angle θ ₂ of ultraviolet rays may be calculated as shown in Equation 2 below. Therefore, the equation for ultraviolet reflection can be expressed by Equation 3 below.

Based on this, the ultraviolet rays reflected from the nano-lens array were plotted using graphing software (OriginPro 2018, OriginLab Corp., Northampton, MA, USA), and the reflection focus formation of the ultraviolet rays was determined through this simulation.

Ultraviolet rays reflected by the nanolens are refracted at the air-quartz and quartz-air interfaces, and refraction follows Snell's law. According to this law, the ratio of the sine of the angle of incidence and the angle of refraction is equal to the reciprocal of the refractive index of the two media.

As it is judged that ultraviolet rays are irradiated perpendicularly to the nano-lens, the incident angle of ultraviolet rays refracted at the air-quartz interface is equal to 2θ ₁ (FIG. 5B, C).

In addition, the refractive values of air, quartz, and water at 254 nm (n _A , n _Q , n _W ) are 1.0003004, 1.5053, and 1.3607 (Ciddor 1996, Hale and Querry 1973, Malitson 1965), and the air-quartz interface (θ ₃ ). In addition, the refractive index at the quartz-water interface θ ₄ may be calculated using Equation 4 below.

The ultraviolet rays reflected from the nanolens array may be calculated by Equation 3, and by using this, 2-D coordinates (x ^RL , z ^RL ) of z ^RL = 0 points of the reflected ultraviolet rays may be calculated. Using the calculated 2-D coordinates (x ^RL , z ^RL ) and Equation 4 above, a straight line graph of UV rays refracted at the air-quartz interface was created.

The UV refraction at the quartz-water interface was calculated in a similar way to the UV refraction at the air-quartz interface. While the surface diameter of the nanolens array analyzed using SPM is 1 μm × 1 μm, the thickness of the quartz beaker 230 represents 2 mm, so the analyzed SPM data can be used to simulate the refracted ultraviolet light at z = 2 mm. It was judged that the correct result could not be obtained.

However, ultraviolet rays travel in a straight line inside the quartz. Therefore, using the 2-D coordinates of ultraviolet rays refracted at z = 300 nm, it is natural that the refraction of ultraviolet rays at the quartz-water interface is the same as that of the ultraviolet rays refracted at z = 2 mm.

Therefore, after calculating the 2-D coordinates of the ultraviolet rays refracted at the air-quartz interface at z = 300nm, the UV refraction at the quartz-water interface was calculated using this, and the refractive direction of the refracted ultraviolet rays was plotted graphically. It was possible to understand the formation of ultraviolet focus by ultraviolet rays.

2. Results and Discussion

2.1. Development of aluminum-based nano lens array

Alloy 1050 used in this study is aluminum commonly used in industrial applications in the electrical, chemical and food industries. In general, the surface of alloy 1050 exhibits a rough surface as it is produced by mechanical polishing.

In order to efficiently amplify the irradiated ultraviolet light using the nano-lens array, a regular array of nano-lens arrays is required, and for regular alignment, the surface before the nano-lens processing must be flat. The aluminum surface is electrochemically active, and the surface protruding through the electropolishing process can be electrochemically corroded to make the surface extremely flat, resulting in processing into a mirror-like surface.

For regular nanolens arrangement, the aluminum strip was electropolished, and then a nanolens array was developed through selective aluminum oxide film dissolution using anodization and chemical reaction. The surface roughness of the alloy 1050 before electropolishing was 6.06 nm (root mean square; RMS = 7.36 nm), but decreased to 0.42 nm (RMS = 0.53 nm) after electropolishing.

In this study, despite the use of aluminum (alloy 1050) for industrial use, rather than high purity aluminum, it was possible to develop an array of structures in which nanolenses of a certain type are regularly arranged as shown in FIG. 6.

However, in the case of production by supplying a voltage higher than 80V in fisheries and in the case of nanolens arrays produced in phosphate at voltages less than 100V, they were not included in this study because they did not exhibit a constant structured surface.

The average (d) of the diameter of the nanolens made by anodizing in phosphoric acid was found to be larger than that of the nanolens array made from oxalic acid.

Referring to FIG. 13, d values of a nanolens array made by anodizing in hydroxy acid with a voltage of 40V and a nanolens array made by anodizing with phosphoric acid with a voltage of 80V were 72.72 nm and 113.15 nm, respectively. The d values of the nanolens array with 80V voltage and the nanolens array with 120V voltage at phosphoric acid increased to 120.20nm and 187.38nm, respectively.

As the analysis results of this study show that the number N of nanolenses decreases in a curved form as the d value increases, the results of this analysis are judged to be valid (FIG. 7).

2.2. E.coli O157: H7 UV sterilization in distilled water using nanolens array

E.coli O157: H7 applied to the ultraviolet sterilization system to which the nano lens array is applied is affected by the ultraviolet light irradiated from the ultraviolet lamp 110 and the ultraviolet light reflected from the nanolens of the reflector 120. Therefore, as shown in FIGS. 8 and 9, when the nano-lens array was applied, the UV sterilization efficiency for E.coli O157: H7 was higher than that in the case where the nano-lens array was not applied.

In particular, as a result of applying the nano-lens array produced by anodizing in a 60V voltage condition in fisheries, it was found that it exhibits the best sterilization efficiency, and this treatment was analyzed to show a statistical difference compared to other treatments.

The nanolens array and aluminum strip used in this study had the same size and were subjected to UV sterilization under the same conditions. Therefore, the total sum of each ultraviolet energy supplied to the treatment device applied with the electropolished aluminum strip and the treatment device applied with the nano lens array is the same.

Therefore, the difference in UV sterilization efficiency between the electro-polished aluminum strip treatment and nano-lens array treatment is judged to be due to the nano-lens.

When a nano lens array is applied, it is expected that ultraviolet rays converge and amplify at a specific point by the nano lens. And the total amount of ultraviolet energy converging on the focus is thought to be related to the d value.

In addition, since the number of UV focuses is judged to be related to the number of nanolenses, it is determined that a nanolens array of a specific terrain is required to improve ultraviolet sterilization efficiency using the nanolens array.

Referring to FIG. 13, d and N of the anodized nanolens array by supplying a voltage of 60 V in fisheries are 90.03 nm and 161 / μm ^-2 , respectively, and anodized nanolens through a voltage supply of 40 V in fisheries It is greater than d in the array, while greater than N in other nanolens arrays.

As the best UV sterilization efficiency was observed in the anodized nano-lens array treatment through the supply of 60 V from fisheries, d = 90.03 nm, N = 161 / μm ^-2 level topography was the best for improving UV sterilization efficiency. It is judged that it is a preferable nanolens array condition.

2.3. Formation of UV-reflective focus by nano lenses

In this study, the reflector 120 with the nanolens array was placed on the outer bottom of the quartz beaker 230. Therefore, the UV sterilization efficiency is affected by the UV transmittance of the quartz beaker 230.

As a result of analysis, the transmittance of the quartz beaker 230 used in this study was 84.4% (± 0.5%) at 254 nm ultraviolet light. In addition, the irradiated ultraviolet light passes through the quartz beaker 230 to reach the nanolens array and is reflected, and then passes through the quartz beaker 230 to reach E. coli O157: H7, 71.2% of the irradiated ultraviolet light (84.4 It is judged that the ultraviolet rays below% square) were reflected and affected ultraviolet sterilization.

Although about 28.8% of the ultraviolet rays were lost by the quartz beaker 230, when the nanolens array was applied, the ultraviolet sterilization efficiency could be improved. In addition, it is judged that the improvement of the ultraviolet sterilization efficiency according to the application of the nano lens array is due to the ultraviolet condensing effect of the nano lens.

As the nanolens array was positioned on the lower outer side of the quartz beaker 230, a study was conducted on the focal length of ultraviolet light condensation reflected from the nanolens.

In order to calculate the focal length of the ultraviolet condensing reflected from the nanolens, the trajectory of the ultraviolet reflected from the nanolens was simulated according to the aforementioned method (FIG. 10).

As a result of the simulation, it was analyzed that the focal length of ultraviolet rays reflected and collected by one nanolens was less than 60 nm. Therefore, it is judged that the focus of ultraviolet light collected by one nano-lens does not exist inside the quartz beaker.

However, it was determined that the ultraviolet rays reflected by the different nanolenses could converge and converge at a long distance, as shown in the example shown in FIG. 2.

In order to determine the possibility of long-distance convergence and condensation of ultraviolet rays reflected from different nanolenses, SPM is applied to the surface of the nanolens array produced by anodic oxidation by supply of 60V electricity from oxalic acid, which shows the best sterilization efficiency. After analysis, the coordinates of 2-D terrain were obtained using SPIP.

Then, based on this, the trajectory of the ultraviolet rays reflected from each nano-lens was analyzed according to the method described above, and the results as shown in FIG. 11 were obtained. As expected, it was observed that the simulated ultraviolet trajectory is similar to the reflected ultraviolet trajectory.

Since the nano-lens on the nano-lens array has a certain standard, the trajectory of the reflected ultraviolet light is analyzed to show a certain pattern. It is judged that ultraviolet rays reflected by different nanolenses can be converged at a long distance and condensed. However, the reflected ultraviolet light is inevitably refracted when passing through the quartz beaker 230.

The refraction of ultraviolet light appears at the air-quartz and quartz-water interfaces, and the trajectory of the refracted ultraviolet light is mathematically analyzed and shown in FIG. 12 to determine the possibility of condensation by ultraviolet light reflected by different nanolenses after refraction. .

As a result of analysis, the absolute value of the incident angle of reflected ultraviolet light decreased from 12.31 ° ± 6.31 ° to 8.99 ° ± 4.59 ° after refraction at the air-quartz and quartz-water interfaces. As a result of the simulation, it is observed that the vertical distance of the ultraviolet focus formed after refraction is greater than the vertical distance of the simulated ultraviolet focus when there is no refraction.

However, the focal pattern formed after refraction was similar to that in the case where refraction was excluded. This is judged to be because the change in the angle of incidence due to refraction is only 3.32 ° ± 1.73 ° on average.

Therefore, the ultraviolet rays reflected by the different nanolenses of the nanolens array located outside the quartz beaker 23 pass through the quartz beaker 23 to converge and condense, and as a result, it is determined that the sterilization efficiency is improved.

As a result of simulation of the ultraviolet focus formed after refraction, the horizontal distance of the focus was observed to be similar to the diameter of the nanolens.

It is observed that the diameter d of the nanolens array produced by anodizing by 60V electricity supply in the fisheries used in the simulation is 90.03 nm, and the horizontal distance of the ultraviolet focus according to the simulation reaches about 90-100 nm.

Bacteria including E.coli O157: H7 are known to have a length of about 2 μm and a thickness of about 1 μm.

Bacteria contaminated with water are randomly dispersed. Therefore, when the focal length of the amplified ultraviolet light is less than the micro level, it is expected that the microscopic bacteria randomly distributed can be effectively sterilized.

In the nanolens array developed in this study, in particular, in the case of a nanolens array produced by anodizing by 60V electricity supply from fisheries, UV sterilization is performed as the distance of the ultraviolet focus collected by different nanolenses is analyzed to be less than 100nm level It is considered that the efficiency can be improved.

3. Conclusion

The aluminum-based nanolens was produced by electrolytic polishing, anodization, and chemical processing for selective dissolution of aluminum oxide.

The anodic oxidation conditions, in particular the anodic oxidation solvent and the supply voltage, were adjusted to control the diameter of the nanolens.

When the nanolens array was applied to the ultraviolet sterilization system, it was observed that the ultraviolet sterilization effect was improved, and it was determined that the ultraviolet sterilization efficiency using the nanolens array was affected by the diameter d and the number N of the nanolens.

In particular, when a nanolens array produced by anodizing by 60V electricity supply from fisheries was applied, it was possible to improve the sterilization efficiency, and d and N of the nanolens array showed 90.03nm and 161 pcs / m ^-2 , respectively. Did.

The improvement of the ultraviolet sterilization efficiency according to the application of the nano-lens array is judged to be because ultraviolet rays reflected from different nano-lenses are collected at a long distance rather than amplification of ultraviolet rays by a single nano-lens.

In the above, the present invention has been illustrated and described in relation to a specific preferred embodiment, but the present invention may be variously modified and changed within the limits that do not depart from the technical features or fields of the present invention provided by the following claims. Being able is obvious to those of ordinary skill in the art.

100: ultraviolet sterilization device
110: ultraviolet lamp unit
111: ultraviolet
120: reflector
210: water tank
220: water to be treated
230: quartz beaker

Claims (9)

An ultraviolet lamp unit that irradiates ultraviolet light with water to be treated; And
It includes a reflector for reflecting the ultraviolet light that has passed through the water to be treated back to the water to be treated,
Ultraviolet ray sterilization apparatus using a lens array, characterized in that the reflector comprises a plurality of lenses According to claim 1,
The lens is ultraviolet sterilization apparatus using a lens array, characterized in that it comprises at least one of a concave lens and a convex lens. According to claim 1,
The ultraviolet lamp unit irradiates ultraviolet light from the outside of the water tank temporarily storing the water to be treated,
The reflecting unit is a UV sterilizing apparatus using a lens array, characterized in that arranged to face the UV lamp unit on the outside of the water tank. According to claim 1,
The reflector is configured using an aluminum plate,
Ultraviolet sterilization apparatus using a lens array, characterized in that it comprises a plurality of concave lenses formed by anodizing the aluminum plate. The method of claim 4,
The lens is a UV sterilization apparatus using a lens array, characterized in that formed by anodization made by supplying a voltage of 60V in fisheries. According to claim 1,
Ultraviolet sterilization apparatus using a lens array, characterized in that the diameter of the lens is composed of 85nm or more and 95nm or less. According to claim 1,
The number of lenses is 156 / μm ² or more 166 / μm ² UV ultraviolet sterilization device using a lens array, characterized in that. According to claim 1,
The diameter and number of the lenses, the ultraviolet ray sterilization apparatus using a lens array, characterized in that the ultraviolet rays reflected from different lenses are configured to form a plurality of focuses in the water to be treated. The method of claim 8,
Ultraviolet sterilization apparatus using a lens array, characterized in that the horizontal distance between the focus is configured to be less than 1μm.

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