KR100852757B1 - Ultraviolet disinfection system for waste-water - Google Patents

Abstract

A non-contact ultraviolet sterilizing device is provided to improve the irradiation efficiency of ultraviolet rays by letting the generated ultraviolet ray pass through a vacuum space and then to be irradiated on an inflow water conduit. A non-contact ultraviolet sterilizing device includes a chamber, an ultraviolet lamp(110) and plural water treatment conduits. The chamber is maintained vacuum. The ultraviolet lamp is installed inside the chamber. The plural water treatment conduits are installed inside the chamber that is separated from the ultraviolet ray lamp. A reflection plate is installed on the inner wall of the chamber. A refrigerating waterway is installed on the outer wall of the chamber. A refrigerant floats inside the refrigerating waterway. The refrigerant is water or liquid nitrogen.

Description

Ultraviolet disinfection system for waste-water

1 is a front view of a non-contact ultraviolet disinfection device according to an embodiment of the present invention.

2 is a plan view of a non-contact ultraviolet disinfection device according to an embodiment of the present invention.

Figure 3 is a side view of a non-contact ultraviolet disinfection device according to an embodiment of the present invention.

4 is a front view of a non-contact ultraviolet chamber according to one embodiment of the invention.

5 is a cross-sectional view taken along line AA ′ of FIG. 4.

6a and 6b are photographs showing a non-contact ultraviolet disinfection device and an ultraviolet chamber actually manufactured according to an embodiment of the present invention, respectively.

Description of the main parts of the drawing

101: storage tank 102: flow pump

103: vacuum pump 104: control panel

110: ultraviolet chamber 111: chamber

112 ultraviolet lamp 113 water treatment pipe

114: coolant 115: temperature sensor

116: ultraviolet sensor 117: reflector

The present invention relates to a non-contact ultraviolet disinfection apparatus, and more particularly to a non-contact ultraviolet disinfection apparatus that can damage not only the DNA of the microorganism but also enzymes and cell walls by using multi-wavelength ultraviolet light including vacuum UV and improve the UV irradiation efficiency. It is about.

In general, sewage treatment plants are used to purify wastewater through several steps, and ultraviolet disinfection equipment is used to remove residual organic matter such as microorganisms. The ultraviolet disinfection apparatus utilizes the principle of preventing the microbial habitat and propagation by destroying the microbial DNA by allowing the ultraviolet light generated from the ultraviolet lamp to be absorbed by the microorganism.

On the other hand, ultraviolet (UV) for ultraviolet disinfection refers to light in the range of about 100 to 400 nm, which is shorter in wavelength than visible light and longer in wavelength than X-ray, but ultraviolet rays of all wavelengths do not have bactericidal power. Ultraviolet rays can be divided into UVA, UVB, UVC and vacuum UV depending on the wavelength. In the case of UVA, it is used for interior decoration requiring a blue lamp with light of 315-400 nm, or for tanning, and in high oxidation process such as photocatalyst (TiO2), photo-ferrioxalate or photo-fenton. UVB (280-315 nm) is called the Dorno gland and causes erythema on the skin. In the case of UVA and UVB, light of this wavelength is hardly absorbed by DNA and cannot be used for direct disinfection. Light of 100-200 nm is called vacuum UV. Because of its short wavelength, its transmittance is low and its absorption is very high. Therefore, even though the ability to penetrate the water does not have high energy to inactivate the microorganisms, there is a limit to the application for disinfection.

The wavelength of light used for inactivation of pathogenic microorganisms is 200-280 nm (UVC), which is called germicidal line and is a wavelength that DNA and protein absorb well. Especially, in case of 253.7 nm, it is the only wavelength that can be produced technically among UVC lamps of low pressure series, and since it belongs to the wavelength with high absorption rate in DNA, most of UV lamps mainly emit 253.7 nm.

On the other hand, the conventional ultraviolet disinfection device is a so-called contact ultraviolet disinfection device is a UV lamp is located in the pipeline through which waste water passes, and a quartz tube is provided around the ultraviolet lamp. Such a contact ultraviolet disinfection device has a problem in that a scale is formed in a quartz tube that protects an ultraviolet lamp when the target raw water is treated in a water quality variable region, thereby significantly reducing the UV transmittance. Naturally, when the UV transmittance decreases, the sterilization effect is reduced.

The present invention has been made to solve the above problems, by using a multi-wavelength ultraviolet light containing a vacuum UV to damage not only the DNA of the microorganism but also enzymes and cell walls, the generated ultraviolet light passes through the vacuum space to the influent water pipe It is an object of the present invention to provide a non-contact ultraviolet disinfection device that can improve the irradiation efficiency by ultraviolet irradiation.

Non-contact UV disinfection device according to the present invention for achieving the above object is a chamber maintained in a vacuum state, the ultraviolet lamp provided in the chamber and a plurality of water treatment pipes provided in the chamber at a position spaced apart from the ultraviolet lamp It is characterized by comprising.

In addition, a reflection plate is provided on the inner wall of the chamber, and a cooling water passage is provided on the outer wall of the chamber. A coolant flows in the cooling water path, and the coolant is either water or liquid nitrogen. On the other hand, the ultraviolet lamp generates ultraviolet rays of various wavelengths at the same time, the ultraviolet rays of the various wavelengths have a wavelength of 150 ~ 300nm.

Each water treatment line is spaced apart from the ultraviolet lamp by the same distance. Specifically, four water treatment pipes are provided, and each water treatment pipe is disposed in the vertical, vertical, left and right directions of the ultraviolet lamp. In addition, the water treatment pipe line may be made of a transparent material, and the water treatment pipe line may be made of quartz.

In addition to the components may further include a storage tank for storing influent water, a flow pump for supplying the inlet water in the storage tank to the water treatment pipe, and a vacuum pump for maintaining the vacuum state of the chamber may be further included. have.

According to a feature of the present invention, as the ultraviolet lamp and the water treatment pipeline are spaced apart in the chamber maintained in a vacuum state, the ultraviolet rays generated from the ultraviolet lamp are irradiated to the water treatment pipeline without changing the wavelength, and the ultraviolet lamp and the water treatment pipeline are not in contact with each other. As it has the form of it is possible to prevent the formation of scale in the water treatment pipeline. In addition, as ultraviolet rays of various wavelengths are simultaneously irradiated to the water treatment pipeline, not only DNA of the microorganism but also enzymes and cell walls can be destroyed to improve disinfection efficiency.

Hereinafter, a non-contact ultraviolet disinfection device according to an embodiment of the present invention will be described in detail. 1 is a front view of a non-contact ultraviolet disinfection device according to an embodiment of the present invention, Figure 2 is a plan view of a non-contact ultraviolet disinfection device according to an embodiment of the present invention, Figure 3 is a contactless according to an embodiment of the present invention 4 is a side view of the ultraviolet disinfection apparatus, and FIG. 4 is a front view of the non-contact ultraviolet chamber according to one embodiment of the present invention, and FIG. 5 is a cross-sectional view taken along line AA ′ of FIG. 4.

First, as shown in FIGS. 1 to 3, the non-contact UV disinfection device according to the embodiment of the present invention is largely a storage tank 101, a flow pump 102, a vacuum pump 103, a control panel 104, and an ultraviolet ray. It is made up of a combination of chambers 110.

The storage tank 101 is a space for storing inflow water, the flow pump 102 serves to supply the inflow water in the storage tank 101 to the ultraviolet chamber 110, the vacuum pump 103 is the ultraviolet light By discharging air in the chamber 110 serves to maintain the interior of the ultraviolet chamber 110 in a vacuum state. In addition, the control panel 104 controls the overall operating conditions of the ultraviolet disinfection device, such as the degree of vacuum, the internal temperature, the ultraviolet intensity of the ultraviolet chamber 110.

Meanwhile, the ultraviolet chamber 110 has a detailed configuration as shown in FIGS. 4 and 5. As shown in FIGS. 4 and 5, the ultraviolet chamber first includes a chamber 111. The chamber 111 defines an internal space of the ultraviolet chamber 110 and may be implemented in a cylindrical shape in one embodiment. The inside of the chamber 111 is maintained in a vacuum state of 1 to 10 ^-3 torr by the vacuum pump 103, and an inner wall of the chamber 111 is provided with a reflecting plate 117 to improve ultraviolet irradiation efficiency. .

An ultraviolet lamp 112 is provided at a central portion of the chamber 111. The ultraviolet lamp 112 may operate under the conditions of low pressure / low output, low pressure / high output, medium pressure / high output as shown in Table 1 below. Here, low or medium pressure refers to the state of mercury vapor pressure, low power or high power refers to the electrical output of the ultraviolet lamp. Specifically, the low pressure / low power is 0.007 torr of mercury vapor pressure and 0.5 W / cm ² of electrical output condition, the low pressure / high power is 0.76 torr of mercury vapor pressure and 1.5 to 10 W / cm ² of electrical output condition. Is a mercury vapor pressure of 300 to 30,000 torr and an electrical output condition of 50 to 250 W / cm ² . In addition, the lamp temperature, lamp efficiency, arc length, etc. of each of the low pressure / low power, low pressure / high power, and medium pressure / high power are as shown in Table 1.

<Table 1> Characteristics of the ultraviolet lamp applied to an embodiment of the present invention

division Low pressure / low power Low pressure / high power Medium pressure / high power wavelength 253.7 nm short wavelength 253.7 nm short wavelength Multi-wavelength (150-300 nm) Mercury vapor pressure (torr) Optimal at 0.007 0.76 300 ～ 30,000 Lamp temperature (℃) 40 130-200 600-900 Electrical output (W / cm2) 0.5 1.5 to 10 50-250 Lamp efficiency (%) 35 ～ 38 30-40 10 to 25 Arc length (cm) 10 to 150 10 to 150 5 to 120 Number of lamps you need plenty middle Less Lamp life (hours) 8,000-10,000 8,000-12,000 4,000 ～ 8,000

The water treatment pipe 113 made of a transparent material is provided in the chamber 111 at a position spaced apart from the ultraviolet lamp 112. The inflow water supplied from the storage tank 101 flows through the flow pump 102 inside the water treatment pipe 113, and the inflow water flowing through the water treatment pipe 113 is irradiated with ultraviolet rays emitted from the ultraviolet lamp 112. Are disinfected by. Accordingly, the water treatment pipe 113 is preferably made of a material having a high UV transmittance, and may be made of quartz in one embodiment.

The water treatment pipeline 113 is located not only spaced apart from the ultraviolet lamp 112 but also spaced apart from an inner wall of the chamber 111. In addition, the water treatment pipe 113 may be provided in plural in the chamber 111, and in one embodiment, four water treatment pipes 113 may be disposed in the vertical, horizontal, left and right directions of the ultraviolet lamp 112.

On the other hand, as the ultraviolet lamp 112 is operated at a temperature of 600 ~ 900 ℃ as shown in Table 1, the temperature of the inner and outer walls of the chamber 111 is increased, the temperature rise of such a chamber 111 Cooling water passage 114 is provided on the outer wall of the chamber 111 as a means for suppressing water, and water or liquid nitrogen may be used as the refrigerant flowing in the cooling water passage 114. In addition, one side of the chamber 111 is further provided with a temperature sensor 115 for measuring the temperature inside the chamber 111 and an ultraviolet sensor 116 for measuring the intensity of the ultraviolet radiation irradiated into the chamber 111. Can be. For reference, the applicant has actually manufactured a non-contact ultraviolet disinfection device and an ultraviolet chamber according to an embodiment of the present invention, as shown in Figure 6a and 6b.

Above, the configuration of the ultraviolet disinfection device according to an embodiment of the present invention was examined. Hereinafter, the operation of the ultraviolet disinfection apparatus according to an embodiment of the present invention, that is, the influent disinfection process using ultraviolet light will be described.

First, the inflow of the storage tank 101 is supplied to the water treatment conduit 113 of the ultraviolet chamber 110 by the flow pump 102 in a state where the inflow water is stored in the storage tank 101. At this time, the inside of the chamber 111 of the ultraviolet chamber 110 maintains a medium vacuum state of 1 to 10 ^-3 torr by the vacuum pump 103, and has a wavelength of 150 to 300 nm from the ultraviolet disinfection lamp Multi-wavelength ultraviolet light is irradiated inside the chamber 111.

Ultraviolet rays generated from the ultraviolet disinfection lamp are irradiated to the inflow water by passing through the water treatment pipe 113 of the transparent material as an example. As a result, the microorganisms in the influent break down the DNA, stop their habitat and reproduction, and ultimately disinfect the influent.

On the other hand, as described in the prior art, ultraviolet rays having a wavelength of 100 to 200 nm are defined as vacuum UV, and since the vacuum UV has a short wavelength, the transmittance is low and the absorption is very high. In the conventional contact UV disinfection apparatus, since the ultraviolet light passes through the water at a predetermined distance, the UV light does not penetrate the water even when irradiated with vacuum UV and thus does not effectively inactivate the microorganisms in the influent.

On the other hand, in the non-contact UV disinfection apparatus according to an embodiment of the present invention, as the vacuum is maintained between the UV lamp 112 and the water treatment conduit 113, the vacuum UV is transmitted to the water treatment conduit 113 without changing the wavelength. It is possible to inactivate the microorganisms in the influent.

For reference, irradiation of vacuum UV with a wavelength of 190 nm or less promotes a homolysis reaction in which water molecules are excited to generate OH radicals and hydrogen atoms, and a small amount of accepting electrons through ionization of water (aqueous electrons) are produced. This vacuum UV disinfection method eliminates the need for additional oxidizing agents to generate the oxidizing species required for conventional AOP (Advanced Oxidation Process) processes. On the other hand, vacuum UV absorbed by water molecules generates OH radicals, hydrogen atoms, and accepting electrons, which play an important role during the decomposition of materials in water by the following formula.

H ₂ O ( l ) + hν (<190 nm) → H + HO

H ₂ O ( l ) + hν (<190 nm) → H + + e-aq + HO

In addition to disinfection effect, such a vacuum UV irradiation is known to achieve the effect of removing organic substances and reducing nitrate nitrogen, and also UV treatment of several wavelengths, for example, 216, 263, 273nm at the same time water treatment pipeline 113 Irradiation of the microorganisms can destroy not only the DNA of the microorganism but also the enzyme and cell wall of the microorganism.

Non-contact ultraviolet disinfection device according to the present invention has the following effects.

As the ultraviolet lamp and the water treatment pipeline are located apart from each other in the chamber maintained in a vacuum state, the ultraviolet rays generated from the ultraviolet lamp pass through the vacuum space so that the ultraviolet rays are not scattered and irradiated to the water treatment pipeline without changing the wavelength. As a result, the irradiation efficiency of ultraviolet rays can be improved. In addition, as the ultraviolet lamp and the water treatment pipeline have a non-contact form, it is possible to prevent the formation of scale in the water treatment pipeline.

In addition, as ultraviolet rays of various wavelengths are simultaneously irradiated to the water treatment pipeline, not only DNA of the microorganism but also enzymes and cell walls can be destroyed to improve disinfection efficiency.

Claims (15)

A chamber maintained in a vacuum state; An ultraviolet lamp provided in the chamber; And It comprises a plurality of water treatment pipes provided in the chamber at a position spaced apart from the ultraviolet lamp, Non-contact ultraviolet disinfection device, characterized in that the reflection plate is provided on the inner wall of the chamber. delete The apparatus of claim 1, wherein a cooling water passage is provided on the outer wall of the chamber. The non-contact UV disinfection device according to claim 3, wherein a coolant flows in the cooling water passage, and the coolant is either water or liquid nitrogen. The non-contact ultraviolet disinfection device according to claim 1, wherein the ultraviolet lamp generates ultraviolet rays of various wavelengths simultaneously. The apparatus of claim 5, wherein the ultraviolet rays of various wavelengths have a wavelength between 150 nm and 300 nm. The method of claim 1, wherein the ultraviolet lamp is operated under any one of the conditions of low pressure / low power, low pressure / high power, high pressure / high power, The low pressure / low output is a mercury vapor pressure of 0.007 torr and an electrical output condition of 0.5 W / cm ² , and the low pressure / high power is a mercury vapor pressure of 0.76 torr and an electrical output condition of 1.5 to 10 W / cm ² . Non-contact UV disinfection device characterized in that the mercury vapor pressure of 300 to 30,000 torr and electrical output conditions of 50 to 250 W / cm ² . The apparatus of claim 1, wherein the pressure inside the chamber is maintained at 1 to 10 ⁻³ torr. The non-contact UV disinfection device according to claim 1, wherein each of the water treatment pipes is spaced at the same distance from the UV lamp. The non-contact UV disinfection device according to claim 1, wherein four water treatment pipes are provided, and each water treatment pipe is disposed in the vertical, horizontal, left and right directions of the ultraviolet lamp. The non-contact ultraviolet disinfection device according to claim 1, wherein the water treatment line is made of a transparent material. The non-contact UV disinfection device according to claim 1, wherein the water treatment line is made of quartz. According to claim 1, further comprising a storage tank for storing influent water, a flow pump for supplying the inlet water in the storage tank to the water treatment pipe, and a vacuum pump for maintaining the vacuum state of the chamber Non-contact ultraviolet disinfection device, characterized in that. The non-contact ultraviolet disinfection device according to claim 1, further comprising a temperature sensor on one side of the chamber that measures a temperature inside the chamber. The non-contact ultraviolet disinfection device according to claim 1, further comprising an ultraviolet sensor which serves to measure the intensity of ultraviolet light irradiated inside the chamber on one side of the chamber.

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