JP2022062415A - Fluid sterilization apparatus, fluid sterilization method, water treatment facility, and water purification equipment - Google Patents

Abstract

To increase an irradiation efficiency of ultraviolet rays emitted from a UV light source to raw water in a fluid sterilization apparatus.SOLUTION: A fluid sterilization apparatus includes: a channel pipe 10 having inside it a treatment channel 5 through which fluid passes in a vertical direction; a pair of water passage ports 12, 13 provided at the top and bottom of the channel pipe 10; a ceiling part 14 connected to an upper end 16 of the channel pipe 10; and a UV light source 20 connected to a lower end 15 of the channel pipe 10 and irradiating UV light along the treatment channel 5, wherein a UV reflecting material 30 is provided on an inner wall of the ceiling part 14.SELECTED DRAWING: Figure 1

Description

The present invention relates to a fluid sterilizer, a fluid sterilizer method, a water treatment facility and a water purification facility.

It is known that ultraviolet rays have a sterilizing ability, and devices that irradiate ultraviolet rays are used for sterilizing treatment in medical and food processing sites. In addition, a device for continuously sterilizing a fluid such as water by irradiating it with ultraviolet rays is also used.

In water purification facilities, if there is a risk that chlorine-resistant pathogens such as cryptosporidium may be mixed in the raw water, the Ministry of Health, Labor and Welfare's "Cryptosporidium Countermeasure Guidelines Kensui No. 0330005 (March 30, 2007)" Based on this, it is necessary to install a fluid sterilizer that irradiates purified water with ultraviolet rays in order to sterilize Cryptosporidium.

The fluid sterilizer has a method of immersing an ultraviolet light source in an open channel with a free water surface (open channel immersion type) and a method of arranging an ultraviolet light source in a pipe and circulating the water to be treated there (sealed flow type). There is.

The water purification equipment of Patent Document 1 has been proposed as an open channel immersion type fluid sterilizer.
As shown in FIG. 3, this water purification facility is a gutter-shaped trough in which a water collecting port 2a is provided on a side wall portion 2 extending in the longitudinal direction and a drain port 3a is provided on an end wall portion 3A on one end side in the longitudinal direction. The main body 1 is provided, and the inside of the trough main body 1 is spaced from the end wall portion 3B on the other end side in the longitudinal direction and extends in the longitudinal direction to be connected to the end wall portion 3A on the one end side in the longitudinal direction. A partition wall 5 is provided which divides the inside of 1 into a water collecting portion 6 communicating with the water collecting port 2a and a water guiding portion 7 communicating with the discharge port 3a, and the water guiding portion 7 is treated to be discharged from the discharge port 3a. An ultraviolet irradiation device 8 for irradiating water with ultraviolet rays is provided.

Further, as a closed distribution type fluid sterilizer, the fluid sterilizer of Patent Document 2 has been proposed. As shown in FIG. 4, the fluid sterilizer 100 has a flow path tube 110 having a linear processing flow path 130 inside, and a plurality of ultraviolet irradiation units 200 for irradiating the treatment flow path 130 with ultraviolet rays. There is. The ultraviolet irradiation unit 200 is arranged so that its optical axis is arranged substantially perpendicular to the axis of the processing flow path 130 so as to face the light emitting element 210 that emits ultraviolet rays and the light emitting surface of the light emitting element 210. It has an arranged reflecting surface 221 that reflects ultraviolet rays emitted from a light emitting element in a direction along the axis of the processing flow path 130.

Japanese Unexamined Patent Publication No. 2018-053502 Japanese Unexamined Patent Publication No. 2020-014647

In the prior art, the irradiation of ultraviolet rays is performed only in one direction in the vertical direction or the horizontal direction, and the irradiation efficiency of raw water is low.
An object of the present invention is to improve the irradiation efficiency of ultraviolet rays emitted from an ultraviolet light source to raw water in a fluid sterilizer that sterilizes a fluid using ultraviolet rays.

The present invention for improving the irradiation efficiency of ultraviolet rays to a fluid is as described below.
(1) A flow path pipe having a processing flow path inside which the fluid passes in the vertical direction,
A pair of water passages provided at the upper and lower parts of the flow path pipe,
A ceiling portion connected to the upper end of the flow path pipe and a ceiling portion
An ultraviolet light source for irradiating ultraviolet rays along the processing flow path, which is continuously provided at the lower end of the flow path tube, is provided.
An ultraviolet reflective material is provided on the inner wall of the ceiling portion.
A fluid sterilizer characterized by that.
(2) The fluid sterilizer according to (1) above, wherein an ultraviolet reflective material is provided on the inner wall of the flow path tube.
(3) The fluid sterilizer according to (1) or (2) above, comprising a condensing lens that collects ultraviolet rays emitted from the ultraviolet light source in a direction parallel to the central axis of the flow path tube.
(4) A transparent plate capable of transmitting ultraviolet rays is provided at the lower end of the flow path tube, and the ultraviolet rays emitted from the ultraviolet light source are applied to the processing flow path through the transparent plate. ) To the fluid sterilizer according to any one of (3).
(5) The fluid sterilizer according to any one of (1) to (4) above, wherein the ultraviolet light source is an ultraviolet LED.
(6) The fluid sterilizer according to any one of (1) to (5) above, wherein the ceiling portion has a hemispherical shape.
(7) A fluid sterilization method comprising sterilizing a fluid using the fluid sterilizer according to any one of (1) to (6) above.
(8) A water treatment facility provided with the fluid sterilizer according to any one of (1) to (6) above.
(9) A water purification facility provided with the fluid sterilizer according to any one of (1) to (6) above.

According to the present invention, it is possible to provide a fluid sterilizer capable of increasing the irradiation efficiency of ultraviolet rays emitted from an ultraviolet light source to a fluid.

It is sectional drawing which shows one Embodiment of the fluid sterilization apparatus of this invention. It is sectional drawing which shows one Embodiment of the fluid sterilization apparatus of this invention. It is a perspective view which shows the conventional open channel type water purification equipment. It is sectional drawing which shows the conventional closed flow type fluid sterilizer.

The fluid sterilizer according to the present invention is a fluid sterilizer that sterilizes the fluid by irradiating the fluid flowing through the treatment flow path with ultraviolet rays, and has a flow path tube having the treatment flow path inside and the treatment flow. It has an ultraviolet light source that irradiates the road with ultraviolet rays.
The flow path pipe is arranged so as to extend in the vertical direction, and the fluid flows in the vertical direction in the processing flow path.

The flow path pipe is preferably a straight pipe having a flow path wall having a substantially columnar inner surface.
A pair of water passages are provided in the upper part and the lower part of the flow path pipe, and the fluid flows into the flow path pipe from one water passage port and is discharged to the outside from the flow path pipe through the other water passage port.
The lower water inlet may be used as a fluid inlet and the upper water outlet may be used as a fluid outlet, or the upper water outlet may be used as a fluid inlet and the lower water outlet may be used as a fluid outlet. You may.

The ultraviolet light source is continuously provided at the lower end of the flow path tube.
It is preferable to provide a condenser lens on the light emitting surface of the ultraviolet light source so that the ultraviolet rays are radiated in one direction from the bottom of the flow path tube toward the upper part of the flow path tube.
An ultraviolet LED can be used as the ultraviolet light source. Since the ultraviolet LED has a lower luminous efficiency than the conventional mercury lamp, it is necessary to increase the irradiation efficiency of the raw water. By using the ultraviolet LED as an ultraviolet light source in the fluid sterilizer of the present invention, it is possible to improve the irradiation efficiency of the ultraviolet rays from the ultraviolet LED to the raw water.

A ceiling portion is continuously provided at the upper end of the flow path pipe, and an ultraviolet reflective material is provided on the inner wall of the ceiling portion. The shape of the ceiling portion is not limited, but may be, for example, a shape in which the ceiling plate is fixed to the upper end portion of the cylindrical wall, or a hemispherical shape. It is preferable that the ceiling portion has a hemispherical shape from the viewpoint of efficiently reflecting ultraviolet rays.
By providing an ultraviolet reflector on the inner wall of the ceiling, when the ultraviolet rays that have passed through the fluid reach the ceiling, they are reflected by the ultraviolet reflector and are incident on the fluid again, thus increasing the irradiation efficiency of the ultraviolet rays. Can be done.

Further, it is preferable that an ultraviolet reflective material is provided on the inner wall of the flow path tube.
By providing an ultraviolet reflector on the inner wall of the flow path tube, among the ultraviolet rays introduced into the processing flow path from the ultraviolet light source, the ultraviolet rays incident on the inner wall of the flow path tube can be reflected by the inner wall of the flow path tube.
As the ultraviolet reflective material, for example, polytetrafluoroethylene (PTFE) or aluminum can be used. The ultraviolet reflective material on the inner wall of the ceiling portion and the inner wall of the flow path tube can be formed by attaching a film of the ultraviolet reflective material to the inner surface or applying a paint of the ultraviolet reflecting material.
Further, the capacity of the flow path pipe and the flow velocity of the fluid are set so that the residence time of the fluid in the flow path pipe is 2 seconds or more.

A first embodiment of the fluid sterilizer of the present invention will be described with reference to FIG. 1 by taking as an example a case where water is used as a fluid and raw water is treated with ultraviolet rays to obtain treated water.
FIG. 1 is a vertical sectional view of a fluid sterilizer 100 according to an embodiment of the present invention.
As shown in FIG. 1, the fluid sterilizer 100 has a flow path pipe 10 having a processing flow path 5 inside, which flows from an inflow port 12 into which the raw water to be treated 1 flows into an outflow port 13 from which the treated water 2 flows out. , A ceiling portion 14 connected to the upper end portion 16 of the flow path tube 10, and a plurality of ultraviolet LEDs 20 connected to the lower end portion 15 of the flow path tube 10.
Hereinafter, the flow path tube 10, the ceiling portion 14, and the ultraviolet LED 20 will be described.

(Flower tube)
The flow path tube 10 is a linear tube having a flow path wall 11 that defines the outer circumference of a substantially columnar processing flow path 5 inside. The flow path pipe 10 has an inflow port 12 into which the raw water 1 flows in and an outflow port 13 in which the treated water 2 flows out.

The flow path tube 10 can be formed of a metal material, a resin material, or the like. The inner surface of the flow path wall 11 is preferably formed of a material having a high reflectance of ultraviolet rays.
Examples of the material having a high reflectance of ultraviolet rays include aluminum (Al) and polytetrafluoroethylene (PTFE).

When the inner surface of the flow path wall 11 is formed of a material having a high reflectance of ultraviolet rays, among the ultraviolet rays introduced into the processing flow path 5 from the ultraviolet LED 20, the ultraviolet rays incident on the flow path wall 11 are passed through the flow path. It can be reflected on the inner surface of the wall 11.

The inflow port 12 is an opening provided in the vicinity of the lower end portion 15 of the flow path pipe 10 for introducing the raw water 1 sterilized by irradiation with ultraviolet rays into the treatment flow path 5. The inflow port 12 is connected to an external raw water supply device, and is configured to allow the raw water 1 from the raw water supply device to flow into the treatment flow path 5.

The raw water 1 introduced into the treatment flow path 5 from the inflow port 12 is irradiated with ultraviolet rays from a plurality of ultraviolet LEDs 20 while flowing through the treatment flow path 5, and is sterilized. After that, the sterilized treated water 2 is discharged from the outlet 13.

The raw water is not particularly limited as long as it is a fluid that can flow through the treatment channel 5, and is, for example, clean water including drinking water and agricultural water, and sewage including wastewater from factories and the like.

The outflow port 13 is an opening formed in the vicinity of the upper end portion 16 of the flow path pipe 10 for discharging the treated water 2 flowing through the treatment flow path 5. The outflow port 13 is formed at a position where the flow direction of the raw water 1 flowing in the treatment flow path 5 and the flow direction of the treated water 2 discharged from the outflow port 13 are not on the same straight line. For example, the outlet 13 can be formed in the vicinity of the upper end portion 16 of the flow path pipe 10 in a direction substantially orthogonal to the processing flow path 5.

(Ceiling)
As shown in FIG. 1, a ceiling portion 14 is continuously provided at the upper end portion 16 of the flow path pipe 10.
In the embodiment shown in FIG. 1, the ceiling portion has a hemispherical shape.
An ultraviolet reflective material 30 is provided on the inner wall of the ceiling portion 14.
As shown in FIG. 1, since the outlet 13 of the treated water 2 is provided at a position lower than the ceiling portion 14, a space portion 17 in which no fluid exists is formed inside the ceiling portion 14.
Due to the presence of the space 17, the inner wall of the ceiling 14 does not come into contact with water. Therefore, scale stains do not occur on the ultraviolet reflective material 30 on the inner wall of the ceiling portion 14, and the ultraviolet reflectance at the start of operation can be maintained even after long-term operation.

(Ultraviolet LED)
The ultraviolet LED 20 is continuously provided at the lower end portion 15 of the flow path tube 10.
The ultraviolet LED 20 preferably includes a condenser lens that parallelizes the ultraviolet rays with respect to the central axis of the flow path tube 10. By irradiating ultraviolet rays at an angle close to parallel to the central axis of the treatment flow path, it is possible to prevent a decrease in irradiation efficiency due to the in-tube scale.

(Transparent plate)
A transparent plate 25 capable of transmitting ultraviolet rays can be arranged between the lower end portion 15 of the flow path tube 10 and the ultraviolet LED 20.
The transparent plate 25 is a member made of a material that can transmit ultraviolet rays, and is a window that is held by the lower end portion 15 of the flow path tube and guides the ultraviolet rays emitted from the ultraviolet LED 20 to the processing flow path 15.

The material constituting the transparent plate 25 is not particularly limited as long as it can transmit ultraviolet rays, but is preferably a material capable of transmitting ultraviolet rays having a wavelength of 200 nm or more and 350 nm or less, and has a wavelength of 260 nm or more and 290 nm or less, which has higher sterilization efficiency. It is more preferable that the material is capable of transmitting ultraviolet rays. Examples of the material of the transparent plate 25 capable of transmitting the wavelength region include quartz (SiO ₂ ), sapphire (Al ₂ O ₃ ), and an amorphous fluororesin. Further, the wetted surface of the transparent plate 25 can be prevented from scaling by using a scraper, ultrasonic waves, or the like.

A second embodiment of the fluid sterilizer of the present invention is shown in FIG.
In the one shown in FIG. 2, in the one shown in FIG. 1, the water passage port 13 provided near the upper end portion 16 of the flow path pipe 10 is used as the inflow port of the raw water 1, and the vicinity of the lower end portion 15 of the flow path pipe 10 is used. The water passage port 12 provided in the above was used as an outlet for the treated water 2.
The raw water 1 to be treated passes through the water passage port 13, the treatment flow path 5 and the water passage port 12 in this order, and is discharged as the treated water 2.

(About Fig. 1 and Fig. 2)
1 Fluid, raw water 2 Treated water 5 Treated flow path 10 Flow path pipe 11 Flow path wall 12 Water inlet (inlet or outlet)
13 Water outlet (outlet or inlet)
14 Ceiling part 15 Lower end part 16 Upper end 17 Space part 20 Ultraviolet light source, ultraviolet LED
21 Ultraviolet rays 25 Transparent plate (ultraviolet irradiation window)
30 UV reflector 100 Fluid sterilizer

(About Fig. 3 and Fig. 4)
1 Traf body 2 Side wall 2a Water collecting port 3a Discharge port 3A End wall part 3B End wall part 5 Partition wall 6 Water collecting part 7 Water guide part 8 Ultraviolet irradiation device 100 Fluid sterilizer 110 Flow path tube 130 Processing flow path 200 Ultraviolet irradiation unit 210 Light emitting element 221 Reflective surface

Claims (9)

A flow path tube that has a processing flow path inside which the fluid passes in the vertical direction,
A pair of water passages provided at the upper and lower parts of the flow path pipe,
A ceiling portion connected to the upper end of the flow path pipe and a ceiling portion
An ultraviolet light source for irradiating ultraviolet rays along the processing flow path, which is continuously provided at the lower end of the flow path tube, is provided.
An ultraviolet reflective material is provided on the inner wall of the ceiling portion.
A fluid sterilizer characterized by that. The fluid sterilizer according to claim 1, wherein an ultraviolet reflective material is provided on the inner wall of the flow path tube. The fluid sterilizer according to claim 1 or 2, further comprising a condenser lens that collects ultraviolet rays emitted from the ultraviolet light source in a direction parallel to the central axis of the flow path tube. A transparent plate capable of transmitting ultraviolet rays is provided at the lower end of the flow path tube, and the ultraviolet rays emitted from the ultraviolet light source are applied to the processing flow path through the transparent plate, according to claims 1 to 3. The fluid sterilizer according to any one item. The fluid sterilizer according to any one of claims 1 to 4, wherein the ultraviolet light source is an ultraviolet LED. The fluid sterilizer according to any one of claims 1 to 5, wherein the ceiling portion has a hemispherical shape. A fluid sterilization method comprising sterilizing a fluid using the fluid sterilizer according to any one of claims 1 to 6. A water treatment facility provided with the fluid sterilizer according to any one of claims 1 to 6. A water purification facility provided with the fluid sterilizer according to any one of claims 1 to 6.

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