JP3255488B2 - Ozone decomposition method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for decomposing residual ozone generated by irradiation with ultraviolet rays when disinfecting air, disinfecting water, or activating a certain substance using high-concentration ozone. About.

[0002]

2. Description of the Related Art As conventional methods for decomposing ozone, there are known an activated carbon adsorption method for adsorbing ozone to activated carbon, a thermal decomposition method for decomposing ozone by heat, and a decomposition method using a catalyst.

[0003]

However, treatment of residual ozone generated by ultraviolet rays irradiated when sterilizing air, disinfecting water, or activating a certain substance using high concentration ozone. As the method, the above-mentioned conventional activated carbon adsorption method, thermal decomposition method and decomposition method using a catalyst are not suitable for decomposing a large amount of ozone, and there is no appropriate treatment method. It was a major barrier to advanced use.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and has an object to ozone decompose irrespective of a gaseous phase or a liquid phase to reduce it to ground state oxygen and sterilize it. Accordingly, an object of the present invention is to provide a method of decomposing ozone, which can sterilize air in a duct for air conditioning and a building and supply sterile water having high dissolved oxygen.

[0005]

SUMMARY OF THE INVENTION The object of the present invention is to provide a method for decomposing ozone, which comprises irradiating ozone with ultraviolet light having a wavelength of 240 nm to 310 nm to produce singlet oxygen. After the
650nm visible light and wavelength 1200nm-1300n
m is irradiated with near-infrared rays, and the ozone undergoes a transition to ground state oxygen while stimulated emission of electromagnetic waves via singlet oxygen.

In the method for decomposing ozone according to the present invention, after irradiating ozone with an ultraviolet laser having a wavelength of 240 nm to 310 nm to generate singlet oxygen, a wavelength of 600 nm to 650 is obtained.
nm visible light laser light and a wavelength of 1200 nm to 130 nm
Irradiation with an infrared laser beam of 0 nm causes ozone to transition to ground state oxygen while promoting stimulated emission of electromagnetic waves via singlet oxygen.

[0007]

As described above, the method of decomposing ozone according to the present invention according to the present invention can be applied to the ozone gas phase alone, a mixed gas of air and ozone, ozone dissolved in water, or ozone present as fine bubbles in water, at a wavelength of 240 nm or less. When irradiating ultraviolet light having a wavelength of 310 nm, O ₃ + hυ (240 nm to 310 nm) → 2 ¹ Δg + ¹
D That is, a singlet oxygen molecule 2 ¹ Δg and a singlet oxygen atom ¹
And D.

[0008] Then, singlet oxygen molecules excited by the absorption of ultraviolet light, the visible light wavelength 600Nm～650nm is ^{irradiated, 1 D + hυ (600nm~650nm)} → 2 3 Σg other words, the photon stimulated emission Molecule 2 in basal oxygen state
Transition to ³ Σg.

Furthermore, wavelength singlet oxygen ¹ D 120
When irradiated with near-infrared ^{0nm~1300nm, 1 D + hυ (1200nm~1300nm} ) → 3 Σg i.e., a transition to the atoms ³ Shigumag basal oxygen conditions, it is intended to decomposition.

[0010]

Next, an embodiment of the present invention will be described below with reference to an ozone decomposing method for decomposing a mixed gas of ozone and air and an apparatus therefor. In this method and apparatus (FIG. 1), a gas mixture of ozone and air is artificially generated in advance, and irradiated with ultraviolet light of 254 nm, visible light of 633 nm, and near infrared light of 1270 nm. It passes through a room having a light band.

In this apparatus, the air sent from the air blower 1 is sent into the upper part of the ozone generating cylinder 2,
In the ozone generation chamber 2, the sent air is irradiated with a light beam from an ozone generation lamp 3. When the sent air reaches the lower part of the ozone generation chamber 2, a part of the air becomes ozone 4.

The ozone 4 passes through the lower communication pipe 5 and
The ozone 4 is sent to the singlet oxygen generating cylinder 6 and irradiated with ultraviolet rays having a wavelength of 253.7 nm by the ultraviolet irradiation tube 7, so that the ozone 4 generates singlet oxygen 8.

The singlet oxygen 8 is further supplied to the upper communication pipe 9
Through which the visible light He-Ne laser 12 having a wavelength of 633 nm is guided by an optical fiber and radiated through the prism 13. The resulting optical film 14 is formed.

Further, a laser beam 1 for irradiating near-infrared light having a wavelength of 1270 nm is provided below the stimulated emission decomposition tube 10.
The near-infrared rays from 5 are guided by an optical fiber,
Film 16 generated by irradiating mirror 11 through
Are formed.

Therefore, the singlet oxygen 8 sent to the stimulated emission decomposing cylinder 10 is subjected to stimulated emission of electromagnetic waves when passing through the first optical film 14 to be decomposed into ground state oxygen. When passing through the optical film 16 provided on the lower side, the excited oxygen becomes completely stable ground state oxygen 17 and is released from the lower discharge port 18.

In order to monitor the transition of the ozone to the oxygen 17 in the ground state, ozone concentration meters 21, 22, and 23 are inserted into the communication tubes 5, 9, and 18, and the monitor 20 measures the ozone concentration. Was. At this time, the room temperature was 18 ° C.
The passing rate at 9 and 18 was 2 liters / minute, and as an ozone concentration meter, OZM-21 manufactured by Octronics Co., Ltd. was used.
A 2-200 type gas phase was used.

At this time, each ozone concentration meter 21, 22, 23
The measured values of the concentration in are shown in the table below.

[Table 1]

Next, a method of decomposing ozone dissolved in water or ozone present as fine bubbles in water and an apparatus thereof (FIG. 2) will be described as a second embodiment. The cylindrical tube 32 into which the dissolved ozone water 31 whose concentration of dissolved ozone is known in advance is sent from the lower entrance 33 is directed to the mirror 34 extending the inside of the tube 32 with the ultraviolet light having a wavelength of 254 nm guided by the optical fiber 35. The optical film 37 is formed by expanding and irradiating with the prism 36.

On the tube 32, a light film 38 of visible light having a wavelength of 633 nm is formed above the light film 37 in the same manner as described above, and a laser emitting near-infrared light is formed above the light film 38. The optical film 39 is formed in the same manner as described above using near-infrared light having a wavelength of 1270 nm.

Therefore, the dissolved ozone water 31 sent into the cylinder 32 from the entrance 33 at the lower part of the cylinder 32 is applied to the optical films 37 and 3.
8 and 39 are sequentially passed and overflow from the upper part of the tube 32.
When passing through 39, the same action as in the previous embodiment is effected.
It is stable oxygen in the ground state via oxygen in the multiplet state.

At this time, in order to measure the amount of residual ozone at the time of overflow at the upper part of the cylinder 32, a dissolved ozone sensor 41 is installed at the upper part 40 of the cylinder 32, and the dissolved ozone sensor 41 captures the dissolved ozone. The amount was measured on the monitor 42. At this time, the passing water volume is 1 liter / min, and the water temperature is 1
At 6 ° C., the dissolved ozone meter is a diaphragm polarographic system / model 0C-100 manufactured by Bionics Instruments.

The results of the measurement are shown in the following table.

[Table 2]

The invention of the second embodiment is different from the ultraviolet irradiation tube 7 of the above-described embodiments for irradiating ultraviolet rays having a wavelength of 253.6 nm.
To an ultraviolet laser of 240 nm to 310 nm,
The visible light He-Ne laser 12 having a wavelength of 633 nm is used as a visible light laser, and the laser light 15 having a wavelength of 1270 nm is used.
Is replaced by a near-infrared laser, which produces the same operation and effect as the above-described embodiments.

In the above two embodiments,
Although the description has been given of the case where the irradiation of visible light and the irradiation of near-infrared light are sequentially performed, the dissolved ozone can be decomposed even if irradiation of only one of them is performed. Of course, in this case, it is better to perform both visible light irradiation and near infrared irradiation.
The decomposition efficiency is high.

[0024]

As described above, the present invention relates to a method for decomposing ozone in which oxygen excited by stimulated emission of photons is decomposed by transition to a ground state. Can be disassembled.

In this decomposition method, unlike conventional thermal decomposition methods, catalytic decomposition methods and activated carbon adsorption methods, etc., oxygen is revived because it is decomposed into ground state oxygen via singlet oxygen in the decomposition process. The air is sterilized and sterilized at the same time, so by incorporating it as an air conditioning duct or air purifier, the sterilization of air in buildings as well as hospital infections, which are currently a problem, is achieved.

In addition, dissolved ozone water is similarly decomposed, and the harm caused by dissolved ozone is eliminated, and it is necessary to supply not only cultured fish and shellfish but also hospital hand washing water, food processing water, drinking water, well water and the like to safe water. And the like.

[Brief description of the drawings]

FIG. 1 is a sectional view of an apparatus according to a first embodiment of the present invention.

FIG. 2 is a sectional view of an apparatus according to a second embodiment of the present invention.

[Explanation of symbols]

 2 Ozone generating tube 3 Ozone generating lamp 6 Singlet oxygen generating tube 7 UV irradiation tube 10 Stimulated emission decomposition tube 12 Visible light He-Ne laser 14 Visible light film 17 Oxygen in ground state 31 Dissolved ozone water 32 tube 37 UV Light film 38 Visible light film 39 Near infrared light film

Claims (2)

(57) [Claims] After irradiating ozone with ultraviolet rays having a wavelength of 240 nm to 310 nm to generate singlet oxygen, a wavelength of 60 nm is obtained.
Visible light of 0 nm to 650 nm and wavelength of 1200 nm to 1
A method for decomposing ozone, which comprises irradiating near-infrared rays of 300 nm, and causing ozone to undergo a stimulated emission of electromagnetic waves via singlet oxygen, while transiting to ground state oxygen. 2. Ozone is irradiated with an ultraviolet laser having a wavelength of 240 nm to 310 nm to generate singlet oxygen, and then irradiated with a visible light laser light having a wavelength of 600 nm to 650 nm and an infrared laser light having a wavelength of 1200 nm to 1300 nm. Characterized in that a transition to ground state oxygen is made while promoting stimulated emission of electromagnetic waves via singlet oxygen.