JPH10309569A - Outside irradiation type u.v. ray sterilization device of water to be treated - Google Patents

Abstract

PROBLEM TO BE SOLVED: To surely sterilize water, to easily wash a tube and to enhance accuracy of measurement of U.V. ray intensity in which an inflow quantity into respective tubes is kept constant and an U.V. ray exposure amount is kept uniform. SOLUTION: This device is provided with light transmission tubes 6 for allowing the water 31 to be treated to flow into the insides vertically provided, U.V. ray lamps 10 arranged in parallel to the outsides and a storage part 15 for storing the water 31 to be treated flowing in from a raw water flow path 21 between the raw water flow path 21 and a treated water tank 18 whose the water surface is opened to the outside air. One end of the light transmission tube 6 is opened to the storage part 15, also the other end is opened to the bottom of the treated water tank 18, an outflow weir of the treated water is provided in the vicinity of the outflow port 9 and the treated water 32 flowing out from the other end of the light transmission tube 6 is overflow to a treated water discharge path 23. Furthermore, an inflow gate 27 for interrupting inflow of the water 31 to be treated is provided between the raw water flow path 21 and the storage part 15.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an externally illuminated ultraviolet disinfection apparatus for disinfecting treated sewage water and purified water (drinking water), or for preventing the generation of algae in a water purification treatment process or a scenic pond. It is.

[0002]

2. Description of the Related Art FIGS. 4A and 4B show an example of an externally illuminated ultraviolet disinfection means, wherein FIG. 4A is a perspective view and FIG. 4B is a front view. As shown in FIG. 4 (A), the externally illuminated ultraviolet disinfection means 5 allows the water 31 to be disinfected to flow inside a light transmissive tube 6 that is a tube that transmits ultraviolet light. An ultraviolet lamp 10 for irradiating the water 31 to be treated with ultraviolet rays for disinfection is disposed parallel to the light-transmitting tube 6 outside the tube 6. FIG. 4B shows the relative positional relationship between the light-transmitting tube 6 and the ultraviolet lamp 10.
The ultraviolet lamps 10 are arranged at a distance of m.

FIG. 5 is a longitudinal sectional view showing an example of a conventional apparatus for disinfection of water to be treated with ultraviolet rays. The water disinfection apparatus 100 for treating water is of a horizontal type provided in an open channel, and the water 31 to be treated flowing into a water tank 101 is a flow straightening plate 102.
UV lamps 103 passing through the lamp and arranged in a plurality in the horizontal direction
Flows horizontally around Multiple UV lamps 103
Are supported by a frame to form a lamp assembly (or a lamp support rack) 104. Aquarium 10
The first water level 105 is maintained by a water level adjustment gate 106. The to-be-treated water 31 is disinfected by being irradiated with ultraviolet rays by the ultraviolet lamp 103 of the lamp assembly, becomes the treated water 32, and flows out of the water channel 107.

FIG. 6 is a perspective view showing another example of a conventional apparatus for disinfection of ultraviolet rays with water to be treated. The ultraviolet ray disinfection apparatus 100 for the water to be treated introduces the water to be treated 31 into the header pipe 108 and distributes the water 31 from the header pipe 108 to each light transmitting tube 110. Light transmitting tube 110
To be treated 31 distributed to the light-transmitting tube 110
Is irradiated with ultraviolet rays by an ultraviolet lamp 103 arranged around the radiator and sterilized. Disinfected treated water 31
Is a light transmitting tube 110 to a header pipe 109.
And discharged as treated water 32. This type is
Both the inflow and outflow of the water to be treated 31
No. 8, 109 is used, and even if the amount of the water to be treated 31 changes, there is no change in the cross-sectional area of the water flow. Frequent, high-intensity UV radiation,
There are advantages such as high disinfection effect.

FIG. 7 is a longitudinal sectional view showing another example of an ultraviolet ray disinfection apparatus for water to be treated similar to FIG. The externally illuminated ultraviolet disinfection device 100 for the water to be treated includes a cylinder 110,
It has a medium-pressure sterilization lamp 111 provided inside thereof, a power supply connection unit 112 for supplying power to the medium-pressure sterilization lamp 111, and an ultraviolet sensor 113 for constantly measuring and monitoring ultraviolet intensity. Medium pressure germicidal lamp 1
11 is a lamp immersion type disinfecting apparatus in which one unit is formed by one of the eleven. The water to be treated 31 is disinfected by ultraviolet rays when passing outside the medium-pressure sterilization lamp 111 and flows out as treated water 32.

[0006]

However, the apparatus 100 for disinfection of the water to be treated shown in FIG. 5 has a problem that when the water level rises due to fluctuations in the amount of inflow water, for example, an increase in the amount of inflow water.
The flow rate of the water to be treated 31 flowing through the lamp assembly 104 immersed in the open channel is high on the water surface side and slow on the bottom side, so that the amount of ultraviolet exposure between the water flowing on the water surface side and the water flowing on the bottom side is reduced. different. Therefore, there is a problem that a complicated water level adjusting gate for minimizing a change in water depth of the open channel is required. Furthermore, there is a problem that three-dimensional evaluation of ultraviolet irradiation intensity and complicated water flow analysis are required to obtain the same disinfection performance even when the water depth, width, or length is different. Was.

On the other hand, an externally illuminated ultraviolet disinfection apparatus 100 shown in FIG.
When the number 10 increased, it was difficult to equalize the amount of water flowing into each light-transmitting tube 110. UV lamp 1
It is important to measure and monitor the intensity of ultraviolet irradiation due to a decrease in the output of the tube 03 or contamination of the inner surface of the tube that is in contact with the water 31 to be treated, but the external illumination type ultraviolet disinfection device shown in FIG. It was difficult to measure the UV illuminance in the light transmitting tube 110.

[0008] Ultraviolet disinfection device 1 for the water to be treated shown in FIG.
In the case of No. 00, in addition to the low reliability of the ultraviolet ray sensor 113, the attachment window of the ultraviolet ray sensor 113 was also stained, so that it was difficult to measure the online ultraviolet ray intensity. Further, there is a type in which a mechanical wiper is attached to the surface of the tube for cleaning the surface of the quartz glass for lamp protection, but it has been difficult to remove proteins and polysaccharides adsorbed on the quartz glass surface.

[0009] An object of the present invention is to uniformly disinfect the amount of ultraviolet light exposed to a constant amount of water flowing into each tube. Further, it is easy to clean the tube, and the measurement accuracy of the ultraviolet intensity is high.

[0010]

In order to solve the above-mentioned problems, the present invention is directed to flowing water to be disinfected inside a tube that transmits ultraviolet light, and flowing the water to be treated outside the tube in parallel with the tube. In an externally illuminated ultraviolet disinfection device in which treated water is provided with an ultraviolet lamp for irradiating ultraviolet rays onto the raw water, the raw water flows from the raw water flow path between the raw water flow path and the treated water tank whose water surface communicates with the atmosphere. A reservoir for storing the water to be treated, wherein one end of the tube is opened in the reservoir and the other end of the tube is opened to a treated water tank whose water surface communicates with the atmosphere.

One end of the tube is opened at the bottom of the treated water tank, and the treated water is allowed to flow naturally from the treated water tank to the treated water discharge passage. It flows in at the inflow rate, and has a uniform UV exposure amount, and is surely disinfected.

[0012] Further, in the externally illuminated ultraviolet disinfection device for water to be treated, the tube is vertically connected to a treated water tank. By connecting the tubes vertically to the treated water tank, the removal of air bubbles in the treated water is assured, and in addition to the action of the externally illuminated ultraviolet disinfection device for the treated water, the inflow of the treated water into each tube Are further uniformed, and the structure of the device is simplified and the production is facilitated.

Further, in any of the above-mentioned externally illuminated ultraviolet disinfection apparatuses for treated water, a weir for overflowing the treated water is provided near an outlet of the treated water tank. By providing a weir, in addition to the action of any of the above-mentioned externally illuminated ultraviolet disinfection equipment for the water to be treated, the water level of the treated water tank becomes the same due to a simple structure, and the head applied to each tube can be kept constant. As a result, the amount of inflow and outflow of each tube is made more uniform, and the amount of exposure to ultraviolet light is made more uniform and disinfected.

Further, in any of the above-mentioned externally illuminated ultraviolet disinfection apparatuses for treated water, a gate or a valve for blocking the inflow of treated water is provided between the raw water flow path and the storage section. . By providing a gate or a valve between the raw water flow path and the storage section, in addition to the operation of any of the above-mentioned externally illuminated ultraviolet disinfection devices for the water to be treated, the gate or valve allows the raw water flow path to be connected to the storage section. By shutting off the gap and then introducing a chemical for removing the stain on the inner surface of the tube, the inner surface of the tube can be easily cleaned. Further, by opening the tube to the treated water tank, the attachment and maintenance of the ultraviolet sensor become easy, so that the measurement accuracy of the ultraviolet intensity is increased.

[0015]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram showing an embodiment of an externally illuminated ultraviolet disinfection apparatus for water to be treated according to the present invention. 1 to 3, the same or equivalent parts are denoted by the same reference numerals.

FIG. 1 is a longitudinal sectional view showing an embodiment of an externally illuminated ultraviolet disinfection apparatus for treated water according to the present invention, and FIG.
FIG. 3 is a sectional view taken along the line II in FIG. 1 and FIG. 3 is a plan view in FIG. The externally illuminated ultraviolet disinfection device 1 of the present embodiment of the water to be treated includes a water 31 to be disinfected inside a light transmitting tube 6 that is a tube that transmits ultraviolet light.
And an ultraviolet disinfection means 5 having an ultraviolet lamp 10 for irradiating the treated water 31 with ultraviolet rays to disinfect the water to be treated 31 in parallel with the light-transmitting tube 6 on the outside. The ultraviolet disinfection means 5 has a plurality of light transmitting tubes 6 and a plurality of ultraviolet lamps 10.

Furthermore, the water 3 to be treated flowing from the raw water flow path 21 is provided between the raw water flow path (or a water path or a pipe instead of the water path) 21 and the treated water tank 18 whose water surface communicates with the atmosphere.
1 is provided. Then, one end 7 of the light transmissive tube 6 of the ultraviolet disinfection means is opened in the storage part 15, and the other end 8 of the light transmissive tube 6 is opened to the treated water tank 18, and the treated water 32 is discharged into the treated water discharge passage 23. To be discharged.

The ultraviolet disinfecting means 5 is provided in the water tank 2, and further has a storage section 15 at the lower part of the water tank 2 and a treated water tank 18 whose water surface communicates with the atmosphere at the upper part. The light transmissive tube 6 of the ultraviolet disinfection means 5 is vertically fixed in a watertight manner between the inflow side tube sheet 17 provided in the storage part 15 and the outflow side tube sheet 13 provided in the treated water tank 18. ing. The raw water flow path 21 and the storage unit 15 are connected by the connection unit 4.

As shown in FIG. 2, a treated water discharge passage 23 is provided along the side surface of the treated water tank 18, and a weir that overflows the treated water 32 into the treated water discharge passage 23 near the outlet 9 of the treated water tank. A treated water outflow weir 19 is provided. Further, as shown in FIG. 1 or FIG. 3, an inflow gate 27 is provided between the raw water flow path 21 and the storage section 15 to block the inflow of the water 31 to be treated, and the treated water discharge path 23 and the discharge water path 2 are provided.
5 and an outflow gate 28 is provided.

The externally illuminated ultraviolet disinfection apparatus 1 having the above-described structure according to the present embodiment operates as follows.
That is, the treated water 31 flows from the raw water flow path 21 to the inflow gate 2
After passing through the connecting part 4 and the connecting part 4, it flows into the storage part 15 and is temporarily stored. The amount of the water to be treated 31 stored in the storage unit 15 is set to be larger than the amount of water flowing into the light transmitting tube 6 from one end 7 of the light transmitting tube 6.

Further, the light transmitting tube 6 is connected to the treated water tank 1.
8, and the treated water is naturally dropped from the treated water tank 18 to the treated water discharge passage 23, thereby forming the treated water tank 1.
The water level of 8 can be the same at all positions, and the amount of water flowing into each light-transmitting tube 6 can be equalized.
Therefore, the water to be treated 31 flows into the one end 7 of the light-transmitting tube 6 from the reservoir 15 almost uniformly to any of the light-transmitting tubes 6, and the flow velocity becomes equal at all positions. While ascending in the interior 6, the ultraviolet ray is irradiated from the ultraviolet lamp 10 to kill microorganisms such as bacteria in the water to be treated. Further, a treated water outlet weir 1 is provided on the side of the treated water tank 18.
By providing 9, the inflow amount can be made even more uniform.

The water surface 22 of the raw water flow path 21 and the treated water tank 18
The distance ΔH from the water surface 3 corresponds to the head loss of the ultraviolet disinfection means 5, and the distance Δh between the water surface 3 of the treated water tank 18 and the top of the treated water outflow weir 19 is the overflow depth of the treated water outflow weir 19. ,
ΔH and Δh change due to fluctuations in the amount of inflow water. When the inflow amount is zero, the water surface 22 of the raw water flow path 21 is
Down to the top level. Δh, that is, the water level of the treated water tank 18 changes with the fluctuation of the amount of water to be treated, but since the water level of the treated water tank 18 is the same at all positions, the amount of inflow into each light transmitting tube 6 is equal. become.

Further, since the light transmitting tube 6 is vertically connected to the treated water tank 18, the removal of air bubbles in the treated water is ensured, and the treated water 3 is supplied to each light transmitting tube 6.
1 becomes more uniform, the structure of the device becomes simpler, and the production becomes easier. Then, the raw water flow path 21 and the reservoir 1
By providing the inflow gate 27 between the raw water flow path 21 and the raw water flow path 21 and the storage section 15,
From the open surface of the treated water tank 18, a chemical solution such as hypochlorous acid or citric acid for removing dirt on the inner surface of the tube is injected, and the inner surface of the light-transmitting tube 6 is easily washed by leaving it for a certain period of time. I can do it.

It is important to monitor the ultraviolet intensity because the intensity of the ultraviolet light received by the water to be treated decreases due to a long-term decrease in the output of the ultraviolet lamp 10 and contamination of the light transmitting tube 6. The reliability of the UV intensity meter is low. Therefore, as shown in FIG. 1, by inserting a portable type ultraviolet intensity (illuminance) sensor 30 into the light transmitting tube 6 periodically, it is possible to accurately measure the accurate ultraviolet intensity.

[0025]

According to the external irradiation type ultraviolet disinfection apparatus of the present invention, the flow rate of the water to be treated into each tube is constant, and the exposure amount of the ultraviolet rays is uniform and is surely disinfected. Further, the tube can be easily washed, and the measurement accuracy of the ultraviolet intensity is high.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing an embodiment of an externally illuminated ultraviolet disinfection device for treated water according to the present invention.

FIG. 2 is a sectional view taken along line II in FIG.

FIG. 3 is a plan view of FIG.

FIG. 4 shows an example of an externally illuminated ultraviolet disinfection means, and FIG.
Is a perspective view, and (B) is a front view.

FIG. 5 is a longitudinal sectional view showing an example of an apparatus for disinfecting treated water according to the related art with an ultraviolet ray.

FIG. 6 is a perspective view showing an example of another apparatus for disinfecting ultraviolet light of water to be treated according to the prior art.

FIG. 7 is a longitudinal sectional view showing an example of an ultraviolet ray disinfection device for still another water to be treated similar to FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Externally-illuminated ultraviolet disinfection apparatus of the to-be-processed water 6 Light transmissive tube (tube) 7 One end 8 The other end 9 Outflow port 10 Ultraviolet lamp 15 Storage part 18 Treated water tank 19 Treated water outflow weir (weir) 21 Raw water flow path 27 Inflow gate (gate or valve) 31 Treated water 32 Treated water

 ──────────────────────────────────────────────────続 き Continuation of the front page (72) Inventor Koji Ishida 5-2-1 Ginza, Chuo-ku, Tokyo Chiyoda Corporation

Claims (4)

[Claims] 1. An object in which water to be disinfected is passed inside a tube that transmits ultraviolet light, and an ultraviolet lamp is disposed outside the tube in parallel with the tube to irradiate the water to be treated with ultraviolet light to disinfect the water. In an externally illuminated ultraviolet disinfection device for treated water, a storage section for storing the water to be treated flowing from the raw water flow path is provided between a raw water flow path and a treated water tank whose water surface communicates with the atmosphere. And an open-end type ultraviolet disinfection device for the water to be treated, wherein one end of the tube is opened and the other end is opened to the treated water tank. 2. The externally illuminated ultraviolet disinfection device according to claim 1, wherein the tube is provided vertically. 3. The externally illuminated ultraviolet disinfection device according to claim 1, wherein a weir for overflowing the treated water is provided near an outlet of the treated water tank. 4. The water to be treated according to claim 1, wherein a gate or a valve for blocking the inflow of the water to be treated is provided between the raw water flow path and the reservoir. External illumination type UV disinfection device.