JP2001054788A - Rapid sterilization/activation of water and its apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent the function of a photocatalyst functioning body from being deteriorated even when used for a long time by contacting the photocatalyst functioning body, which is formed from optical semiconductor powder, silicon fine particles and an adsorption material, with water in an ultraviolet ray irradiating step. SOLUTION: The photocatalyst functioning body 1 is formed from the optical semiconductor powder 2 such as TiO2, CdS, CdSe, WO3, Fe2O3, SrTiO3 and KNbO3, the silicon fine particles 3 functioning as an electrode and one or more adsorption materials 4 selected from the group consisting of ceramic powder such as apatite (phosphorite), zeolite and cebollite, activated carbon and a silk fiber-containing material. The body 1 is brought into contact with water in the ultraviolet ray irradiating step for irradiating the water with plural ultraviolet rays of selected wavelengths individually. Thereby, the function of the body 1 can be enhanced even when used for a long time.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and an apparatus for rapidly sterilizing and activating water, particularly seawater, which can sterilize and activate water.

[0002]

2. Description of the Related Art At present, purification of water, that is, sterilization and activation of water, is performed in various places regardless of freshwater or seawater for various purposes.

In addition to tap water, industrial wastewater and sewage from general households, pool water and water from artificial ponds are also objects of purification. Water and seawater in fish and shellfish used for cultivation are also targets for purification.

However, most of the conventional water purification methods use chlorine, which is not preferable for living organisms including humans, and a new water purification method has been sought.

Conventionally, an ultraviolet irradiation apparatus for irradiating a short wavelength, an ultraviolet irradiation apparatus for irradiating a medium wavelength, and an ultraviolet irradiation apparatus for irradiating a long wavelength, and a bactericidal activation device utilizing the bactericidal action of ozone. However, there is a problem that the processing capacity is about 5 tons per hour and the demand cannot be satisfied.

In order to solve the above-mentioned processing capacity, the applicant of the present invention has proposed a method for purifying water in a short time by combining an ultraviolet irradiation device and a photocatalyst function, and an apparatus therefor, which is disclosed in Japanese Patent Application No. 11-174754. No. is disclosed to the state by the number.

[0007] The use of the method and apparatus disclosed in Japanese Patent Application No. 11-174754 has solved the problem of the conventional processing capacity. Since silver (Ag) is mainly used as a metal as an electrode, when used in seawater, chloride ions (Cl ⁻ ) contained in seawater react with the metal as the electrode, and the metal acts as an electrode. However, there is a problem that is reduced.

[0008]

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems, and is intended to provide a method and an apparatus for sterilizing and activating a larger amount of water in a shorter time, even when used for a long time. It is an object to prevent the function of the photocatalyst functional body from being reduced.

[0009]

In order to achieve the above object, the present invention provides at least a plurality of ultraviolet irradiation steps for separately irradiating water with a selected wavelength at least. Wherein, in the ultraviolet irradiation step, at least a photocatalyst functional body formed from an optical semiconductor powder, silicon fine particles and an adsorbent material and the water are brought into contact with each other, provide.

According to a second aspect of the present invention, there is provided at least a plurality of ultraviolet irradiators for separately irradiating water with a selected wavelength, wherein the ultraviolet irradiator includes at least a photo-semiconductor powder, silicon fine particles, and an adsorbent. A quick disinfection activation device characterized by being provided with a photocatalytic functional body formed from a material.

In the present invention, the water to be sterilized and activated is individually irradiated with the washed wavelength,
Converts dissolved oxygen, etc. in water to ozone, and decomposes organic matter in water by their oxidizing action, and decomposes organic matter in water by photocatalytic action by irradiating the photocatalytic functional body with specific light (ultraviolet light). As a result, water can be sterilized and activated.

Further, by using silicon (Si) instead of silver (Ag) or the like as an electrode for forming the photocatalytic functional body, the electrode is not affected by chloride ions (Cl ⁻ ) in seawater. In addition, the function of the photocatalyst functional body can be prevented from being reduced even when used for a long time. Here, as described in claim 3, the ultraviolet irradiation device irradiates a short wavelength, thereby irradiating an ultraviolet irradiation device acting as an ozone generator, a medium irradiation ultraviolet irradiation device, and irradiating a long wavelength. UV irradiation device
It is preferable that at least the ultraviolet irradiation device for irradiating the medium wavelength is provided with a photocatalyst functional body formed of at least an optical semiconductor powder, silicon fine particles, and an adsorption material.

Further, as described in claim 4, the short wavelength is 183 nm to 184 nm, and the medium wavelength is 2 to 184 nm.
Preferably, the long wavelength is 310 to 360 nm.

By irradiating ultraviolet rays having a wavelength of 183 nm to 184 nm, dissolved oxygen in water can be changed to ozone or the like. The ultraviolet rays having a wavelength of 254 nm are absorption wavelengths of an optical semiconductor powder constituting a photocatalyst functional body. By irradiating the light of the above-mentioned wavelength, the function of the photocatalytic functional body can be activated, and by irradiating ultraviolet rays of 310 to 360 nm, ozone and the like in water can be returned to the original oxygen and the like. .

[0015]

BEST MODE FOR CARRYING OUT THE INVENTION First, a photocatalyst functional body which is the first feature of the present invention will be described, and then the method and apparatus for rapid sterilization and activation of the present invention will be specifically described with reference to the drawings.

As shown in FIG. 1, the photocatalytic functional body 1 of the present invention comprises at least an optical semiconductor powder 2 and silicon fine particles 3.
And the adsorption material 4.

The optical semiconductor powder 2 is made of TiO._Twoof
Other, CdS, CdSe, WO_Three, Fe _TwoO_Three, SrTi
O_Three, KNbO_ThreeAnd the like. Among them,
TiO_TwoIs attacked by most acids, bases and organic solvents
TiO 2 is chemically stable._TwoCauses addiction
Is not carcinogenic.
It is recognized that TiO_TwoIs most preferred
No.

The silicon fine particles 3 function as electrodes in the photocatalytic function body 1. Moisture is required as one of the indispensable elements for the photocatalyst to exhibit its essential function, but silicon fine particles forming the electrode are preferable because they are stable without change over time in the presence of water. When a metal is used as an electrode, chloride ions (Cl ⁻ ) contained in water, particularly in seawater, react with the metal electrode, and the metal loses its function as an electrode, resulting in a reduced photocatalytic function. However, it is preferable to use silicon fine particles as an electrode because they do not react with chloride ions (Cl ⁻ ) in seawater as described above.

The particle diameter of the silicon fine particles 3 is 0.05 to 0.05 in consideration of the relation of the photo-semiconductor powder 2 as a photocatalyst.
0.1 μm is preferred. The mixing ratio of the optical semiconductor powder and the silicon fine particles is preferably 1 to 55 parts by weight, more preferably 20 to 30 parts by weight, based on 100 parts by weight of the optical semiconductor powder in order to suitably exhibit sterilization and deodorizing effects. Parts by weight are preferred.

The adsorbing material 4 is not necessarily required, but is used for adsorbing and holding objects to be treated such as bacteria, viruses, molds, malodorous substances and harmful substances. Examples of the adsorbing material 4 include ceramic powder such as apatite (apatite) zeolite or sepiolite;
One or more selected from the group consisting of activated carbon and silk fiber-containing materials can be mentioned, and these can be used in combination of two or more as necessary. Here, as the apatite, hydroxyapatite [Ca ₁₀ (PO ₄ ) ₆ (O ₂ ) which selectively adsorbs proteins such as bacteria, viruses and molds is used.
H) ₂ ] is preferred. Examples of the silk fiber-containing material include, in addition to the silk fiber powder, a granulated material, a gel material, and the like. The particle size of these adsorbent materials (when the silk fiber-containing material is powder) is preferably 0.001 to 1.0 μm in consideration of good surface workability and good workability of attachment, and particularly 0.01 to 1.0 μm in consideration of good workability. 0.05 μm is preferred. The mixing ratio of the optical semiconductor powder 2 and the adsorbing material 4 is preferably 1 to 50 parts by weight, particularly preferably 10 to 30 parts by weight, based on 100 parts by weight of the optical semiconductor powder.

Next, a method of attaching the photocatalyst functional body 1 to a substrate will be described.

The photocatalyst functional body 1 is used as a base material such as a polyester nonwoven fabric, paper, woven fabric, plastic, metal plate, ceramic ball or the like by a low-temperature thermal spraying method without a binder, and as a coating material containing a binder. It may be attached on the material.

FIG. 1 shows a state in which a photocatalyst is adhered to the surface of a substrate 5 by a low-temperature thermal spraying method. The substrate 5 is made of a nonwoven fabric, woven fabric, paper, wood, ceramic plate, metal plate, plastic plate or the like. For example, titanium oxide (TiO ₂ ) fine particles (5 to 50 μm) having a melting point of 2000 ° C. or less and silicon fine particles 1 to 10 μm are melted at about 2900 to 3000 ° C. by a gas spraying method using oxygen, acetylene or the like. The sprayed ceramics. In the sprayed state, the photocatalyst particles 1 are composed of titanium oxide particles 2 acting as one electrode, and silicon fine particles 3 acting as the other electrode carried on the titanium oxide particles 2. The photocatalyst particles 1 form an electrochemical cell, and after spraying, 30 to 40
It becomes flat laminated particles of μ and adheres to the substrate 5 by the anchor effect while being melted by the high temperature of the gas. In the low-temperature thermal spraying method by gas thermal spraying using oxygen, acetylene, etc., the gas torch for injecting the molten photocatalyst fine particles and the base material are relatively moved so that the base material surface does not rise to 50 ° C. or more. Therefore, thermal spraying can be performed on paper, cloth, and the like. However, the melting point of the powder used is limited to 2000 ° C. or less because of gas spraying. It should be noted that plasma spraying is also possible by adjusting the relative speed between the torch and the base material. However, in the case of plasma spraying, the material used can be sprayed to a melting point of about 3500 ° C.

In general, in thermal spraying, since powder is adhered to a base material by an anchor effect, a powder for thermal spraying is preferably a lump having a size of 5 μm or more, and all anatase is transferred to rutile as a thermal spraying powder. Things are used. Titanium oxide in the form of anatase crystals (titania) has a strong photocatalytic action, but if all the photocatalyst particles after thermal spraying have anatase crystals,
Since the decomposition action is so strong that the substrate is violated, it cannot be put to practical use. However, the particle size of the anatase crystal particles, the thermal spraying temperature, the substrate surface temperature and the heating source used are 5 to 25 μm, about 2900 to 3000 ° C., and 40 to 40 μm, respectively.
By adjusting and selecting the temperature at 50 ° C. and the gas, 10 to 40% of anatase crystals can be synthesized. That is,
When the transformation point between anatase and rutile exceeds about 750 ° C., all the crystals become rutile-type crystals. However, according to the low-temperature spraying method described above, when all the rutile crystal particles are prepared and sprayed, the particles become 10%. ~ 40% of anatase crystals are produced, the rest being rutile crystals. According to various experiments, X-ray analysis revealed that the weight ratio of anatase to rutile after thermal spraying was preferably 1: 3.

If the photocatalyst particles 1 are mixed with an adsorbing material 4 for adsorbing bacteria such as apatite, zeolite and activated carbon, harmful substances, odors and the like and sprayed, the amount of anatase crystals is adjusted so as not to violate the substrate. This reinforces the point where the photocatalytic action is weakened.

That is, the hydroxyapatite 4 after thermal spraying adsorbs and holds an object to be treated such as bacteria, harmful substances and odors in the atmosphere, and converts the adsorbed and held object to be treated into photocatalytic particles having 20 to 30% by weight of anatase crystals. Is decomposed, so that the photocatalytic action is reinforced. In order to enhance the photocatalytic action, it is necessary to increase the contact area where the particles come into contact with the object, but the low-temperature spraying method is preferable because the particles are finer than plasma spray and a film having a large surface area is formed. .

FIG. 2 shows a film state of a coating material having a photocatalytic function applied on the substrate 5. The coating material includes at least a binder 9 as well as the photosemiconductor powder, silicon fine particles and the adsorbing material. It contains a film-forming component and a dispersant, and if necessary, other components.

The components for forming a coating film include cellulose derivatives, phthalic acid resins, phenol resins, alkyd resins, amino ald resins, acrylic resins, epoxy resins, urethane resins, vinyl chloride resins, silicone resins, fluorine resins, emulsions, and water-soluble resins. And the like. Examples of the dispersant include petroleum solvents, aromatic solvents, alcohol solvents, ester solvents, ketone solvents, cellosolve solvents, inorganic silicon solvents, water and the like. When a powder coating is used, a solvent as a dispersant is not required. Further, as other components, pigments, for example, inorganic pigments such as titanium dioxide, graphite, red iron oxide, chromium oxide, carbon black, organic pigments such as Hansa Yellow, Nova Palm Orange, quinacridone violet, copper phthalocyanine, and precipitated carbonic acid Examples include extender pigments such as calcium, barium sulfate, talc, clay, and white carbon, and special functional pigments represented by anticorrosive pigments such as zinc chromate, strontium chromate, zinc phosphate, and aluminum phosphate. Further, in addition to the above components, as auxiliary materials, desiccants for imparting coating film accelerating properties, pigment dispersants, anti-flooding agents, pigment sedimentation inhibitors, and additives for adjusting the fluidity of paints. Viscous agent, thixotropic agent, anti-drip agent, leveling agent for the purpose of coating surface adjustment, defoamer,
In addition to anti-repellent and anti-floating agents, plasticizers,
An anti-skinning agent, an auxiliary agent for electrostatic coating, an anti-scratch agent, an anti-blocking agent, an ultraviolet ray inhibitor, a dye-proofing agent, a preservative, a fungicide, and the like can be added. There is no special mixing ratio of each of these components, and the same mixing ratio as that of a commercially available paint can be applied.

The total amount of the photosemiconductor powder, the fine silicon particles and the adsorbing material in the paint is 3 to 5% of the total amount of the paint in order to exert effects such as sterilization and deodorization and to secure appropriate paintability.
It is preferably 5% by weight, particularly preferably 15 to 35% by weight.

In FIG. 2, the photocatalyst particles 6 are composed of titanium oxide particles 7 and silicon fine particles 8 carried on the particles. The photocatalyst particles 6 can have the same structure as the particles in the case of the low-temperature spraying method shown in FIG.

Also, titanium oxide (TiO ₂ ), which is all in the form of anatase crystal, has an extremely strong oxidizing power and makes the substrate tattered. The ratio is 20-5
0%: 50-80% is preferable. If the ratio of anatase is less than this, the photocatalytic action is weak, and if it is more than this, the photocatalytic action is too strong to decompose the binder 9 and the paint is immediately decomposed. It will be. Most preferably, the weight ratio of anatase to rutile is about 3: 7.

The titanium raw material does not necessarily need to be anatase and rutile, and an appropriate photocatalyst can be obtained by adjusting the comparison between an anatase having a strong catalytic activity and an anatase having a weak catalytic activity.

The total amount of the photosemiconductor powder, silicon fine particles and adsorbing material in the paint is 3 to 5% of the total amount of the paint in order to exert effects such as sterilization and deodorization and to secure appropriate paintability.
It is preferably 5% by weight, particularly preferably 15 to 35% by weight.

The weight ratio of the photosemiconductor powder and the silicon fine particles to the adsorbing material (hydroxyapatite) is 70 to
80% by weight to 10-20% by weight is preferred.

The method of applying such a coating material is not particularly limited, and methods such as brush coating, air spray coating, electrostatic coating, powder coating, electrodeposition coating, curtain flow coating, and roll coating are applied. be able to.

The component ratio of the paint used by the present applicant is as follows.

1) Acrylic lacquer paint

[Table 1]

2) Liquid urethane paint (in the dried coating) 30% photocatalyst, binder solid content 7
0%.

[Table 2]

3) Baking acrylic paint (in the dried film) 30% photocatalyst, solid content 7 of binder
0%.

[Table 3]

4) Water-based acrylic paint (in the coating film when dried) Photocatalyst 50%, binder solid content 5
0%.

[Table 4]

In general, the photocatalyst is a non-eluting system, and the silicon fine particles carried on the photosemiconductor powder act as electrodes,
It is not eluted in the liquid and sterilized, but exerts a sterilizing effect by OH radicals generated in the presence of water. On the other hand, a conventional dissolution type antibacterial agent, for example, a mixture of an antibacterial agent composed of a zeolite carrying a metal such as silver, copper, and zinc having antibacterial properties and a binder and dried at a required place As shown in FIG. 3, the metal immediately elutes into the liquid and exhibits immediate effect, but the effect is reduced in a short time, and the part where the metal is eluted becomes a nest of bacteria and causes harm instead. Becomes

As shown in FIG. 3, the photocatalyst functional body of the present invention may be inferior to the conventional antibacterial agent in terms of immediate effect, but is almost non-elutable, so that it hardly dissolves in the liquid. And the effect will last for a long time.

Therefore, a conventional antibacterial agent, for example, zeolite fine particles carrying metal ions (Ag, Cu, Zn) having an antibacterial action is mixed with photocatalyst particles (TiO ₂ + Ag) and subjected to low-temperature spraying or the like. If zeolite fine particles carrying the above metal ions are mixed with the binder 9 and used as a coating, it can be used as a quick-acting and long-lasting antibacterial and bactericidal agent.

The method and apparatus for rapid sterilization and activation according to the present invention using the photocatalyst functional body as described above will be specifically described below.

FIG. 4 shows an example of the rapid sterilizing and activating device 10 according to the present invention. Quick disinfection water activation device 10
A pump 11 for drawing water, a short-wave ultraviolet irradiation device 12 for sucking air, irradiating the air with short-wave ultraviolet rays to generate ozone, water drawn by the pump 11, Pressure tank 13 for mixing and applying pressure with ozone generated by ultraviolet irradiation device 12
And a medium-wavelength ultraviolet irradiator 1 for irradiating the water passing through the pressure tank 13 with medium-wavelength ultraviolet rays to sterilize the water.
4 and a long-wavelength ultraviolet irradiation device 15 for irradiating water that has passed through the medium-wavelength ultraviolet irradiation device 14 with long-wavelength ultraviolet light.

First, the short-wavelength ultraviolet irradiation step and the short-wavelength ultraviolet irradiation device 12 will be described.

As shown in FIG. 5, in the short wavelength ultraviolet irradiation device 12, air is taken in from the air suction port 20, and the ultraviolet light is emitted from the air irradiation lamp 21 to the air of 183 nm to 184.
Irradiation with ultraviolet light having a wavelength of nm (short wavelength) is performed. Oxygen (O ₂ ) in the air irradiated with short-wavelength ultraviolet rays becomes oxygen atoms (O) in a ground state. The oxygen atom (O) in the ground state reacts with the surrounding oxygen (O ₂ ) to form ozone (O ₃ ).
Here, the ultraviolet irradiation lamp 21 has two electrodes 23 installed in a quartz glass tube 22 and a quartz glass tube 22.
The inside is in a low pressure state. By applying a potential difference between the electrodes 23, ultraviolet light of a specific wavelength can be obtained. Ozone (O ₃ ) formed by the short-wavelength ultraviolet irradiation device 12 is discharged from an ozone outlet 24 provided below the short-wavelength ultraviolet irradiation device 12.

The ozone (O ₃ ) discharged from the ozone discharge port 24 mixes with the water carried by the pump 11 and enters the pressure tank 13. The pressure tank 13 is a device for applying pressure to the water containing ozone, and by applying the pressure, the reactivity of ozone (that is, the sterilization action) is obtained.
And the pressure itself can kill fungi contained in the water.

Here, the specific magnitude of the pressure is a value determined according to the pressure resistance of bacteria contained in the water to be sterilized and activated. For example, water depth 20-3
When seawater of about 0 m is sterilized and activated, the pressure resistance of bacteria contained in the seawater is considered to be ² to 3 kg / cm ² , and the pressure applied in the pressure tank 13 is 3 to 4 kg / c.
m ² .

The water containing ozone pressurized in the pressure tank 13 enters the medium-wavelength ultraviolet irradiation device 14 from a water inlet provided below the medium-wavelength ultraviolet irradiation device 14.

Now, the medium wavelength ultraviolet irradiation step and the medium wavelength ultraviolet irradiation device 14 will be described.

As shown in FIG. 6, in the medium-wavelength ultraviolet irradiation device 14, ultraviolet light having a wavelength of 254 nm (middle wavelength) is irradiated to the water containing ozone inserted from the water inlet 31 by the ultraviolet irradiation lamp 32. . Ozone (O ₃ ) in water irradiated with ultraviolet light of a medium wavelength becomes three active oxygens (single free oxygen · ¹ O ₂ ). The active oxygen ( ¹ O ₂ ) formed here has high energy and can sterilize water by its bactericidal action, and can also decompose organic chlorine compounds (such as trihalomethane).

The ultraviolet irradiation lamp 32 has the same basic structure as the ultraviolet irradiation lamp 21 used in the short-wavelength ultraviolet irradiation device 12, and has a different wavelength of ultraviolet light to be irradiated.

Here, the medium-wavelength ultraviolet irradiation device 14
Is provided with the photocatalyst function body described previously.

FIG. 6 is a longitudinal sectional view of the medium wavelength ultraviolet irradiation device 14, and FIG. 7 is a cross sectional view of the medium wavelength ultraviolet irradiation device 14. The medium-wavelength ultraviolet irradiation device 14 includes a cylindrical tube 34.
And an ultraviolet irradiation lamp 3 installed at the center of the cylindrical tube 34
Further, a photocatalytic functional body 33 in the form of a paint is applied to the inner wall of the cylindrical tube 34. As shown in FIG. 7, a polyester nonwoven fabric as a base material, and a polyester nonwoven fabric photocatalyst functional body 35 having a photocatalyst functional body adhered to the polyester nonwoven fabric by the low-temperature spraying method in the form of a plate, as shown in FIG. It may be installed radially around 32.

The reason for installing the photocatalyst function body as described above is that light is indispensable for the photocatalyst function body to exert a bactericidal action. On the other hand, if light (ultraviolet rays) is not irradiated to the ozone contained in the water, it does not exhibit a bactericidal action, so that it is not preferable to incorporate the ozone so as to create a shadow.

Here, the way of providing the photocatalyst function body 33 is not limited to the above. For example, if the photocatalytic function body is a transparent paint, it can be applied to the quartz glass tube, and along the inner wall of the cylindrical tube 34, a polyester nonwoven fabric photocatalyst function body 35
It is also possible to set up.

According to the method described above, the photocatalyst functional body provided inside the medium-wavelength ultraviolet irradiation device 14 has a medium-wavelength (25
Irradiation with ultraviolet light (4 nm) forms superoxide ions (O ₂ ⁻ ) and hydroxyl radicals (.OH) from water and dissolved oxygen. These superoxide ion (O ₂ ^-), hydroxyl radicals, (· OH)
Has strong oxidizing power and decomposes bacteria and organic matter.

When the water to be purified is seawater,
The superoxide ion (O ₂ ⁻ ) and the hydroxyl radical (· OH) oxidize the chloride ion (Cl ⁻ ) in the seawater to form chlorine (Cl ₂ ). This chlorine (C
l ₂ ) reacts with surrounding water and reacts with hypochlorous acid (HCl)
O). This hypochlorous acid (HClO) reacts with chloride ions (Cl ⁻ ) in seawater to form chlorine (C
l ₂ ) and hydroxide ions (OH ⁻ ). further,
The hydroxide ion (OH ⁻ ) is oxidized together with the chloride ion (Cl ⁻ ) to form hypochlorite ion (ClO ⁻ ). Further, hypochlorite ion (ClO ⁻ ) reacts with sodium ion (Na ⁺ ) in seawater to form sodium hypochlorite (NaClO), and similarly, calcium ion (Ca ² ) in seawater. ⁺ ) To form calcium hypochlorite (Ca (ClO) ₂ ).

In seawater, it is considered that the above-described reactions occur in a chain, and hypochlorous acid (HClO), chloride ions (Cl ⁻ ), and hydroxide ions formed by these reactions are generated. (OH ⁻ ), hypochlorite ion (ClO ⁻ ), etc. also have a bactericidal action. Further, hydrogen superoxide (HO ₂ ) and divalent hydrogen chloride (HOCl) having a strong bactericidal activity are also generated by the superoxide ion (O ₂ ⁻ ), and are generated in the medium-wavelength ultraviolet irradiation device 14. As a whole, a great bactericidal effect can be produced.

Further, as described above, since silicon fine particles are used for the electrode of the photocatalytic function body used in the present invention, chloride ions (Cl ⁻ ) contained in seawater and silicon fine particles serving as the electrode are separated. There is no reaction and therefore the photocatalytic function, ie the bactericidal action, is not reduced.

Water (seawater) sterilized in the medium-wavelength ultraviolet irradiation device 14 by the above-described method is discharged from a water outlet 36 provided above the medium-wavelength ultraviolet irradiation device 14 and flows through the pipe 40. As shown in FIG. 8, the water enters the long-wavelength ultraviolet irradiation device 15 through a water inlet 41 provided below the long-wavelength ultraviolet irradiation device 15.

In the long-wavelength ultraviolet irradiation step and the long-wavelength ultraviolet irradiation device 15, ultraviolet rays having a long wavelength (310 to 360 nm) are irradiated to the active oxygen and the like generated by the medium-wavelength ultraviolet irradiation device 14 by the ultraviolet irradiation lamp 42. As a result, the superoxide (O ₂ ⁻ ) becomes oxygen (O ₂ ) via the superoxide ion (O ₂ ⁻ ) and the hydroxyl radical (· OH), and the hydroxyl radical (· OH) is converted into the surrounding water (H ₂ O). ) Is deprived of one hydrogen atom (H) to generate active water (H ₂ O).

When the water to be purified is seawater, as described above, sodium hypochlorite (NaClO) and calcium hypochlorite (Ca (ClO) ₂ ) are contained in seawater. However, irradiation with ultraviolet light having a long wavelength (310 to 360 nm) causes sodium hypochlorite (NaClO) and calcium hypochlorite (Ca (Cl
O) ₂ ) are each decomposed to form sodium chloride (N
aCl) and oxygen (O ₂ ). In addition, hydrogen superoxide (HO ₂ ) and divalent hydrogen chloride (HOCl) also become water (H ₂ O) and sodium chloride (NaCl), respectively. That is, even if the water to be purified is seawater, it can be activated (having the same composition as the seawater before purification).

Since the basic structure of the long-wavelength ultraviolet irradiation device 15 is the same as that of the above-described medium-wavelength ultraviolet irradiation device 14, the description thereof is omitted here. The long-wavelength ultraviolet irradiation device 15 may or may not include a photocatalyst treatment body as shown in FIGS.

The method and the apparatus according to the present invention are as follows.
The present invention is not limited to the above embodiment. The above embodiment is an exemplification, and has substantially the same configuration as the technical idea described in the scope of the claims of the present invention. It is included in the technical scope of the invention.

For example, the shape and the like of the short-wavelength ultraviolet irradiation device 12 are not particularly limited, and may be any as long as ozone (O ₃ ) can be generated from air.
Also, the type of the ultraviolet irradiation lamps 21 and 32 is not particularly limited, as long as they can irradiate a required wavelength, and may be a low-pressure mercury lamp or an excimer lamp. Here, in the above-described embodiment, air is introduced into the short-wavelength ultraviolet irradiation device 12, but water may be taken in instead of air, and ozone may be generated by irradiating oxygen in water with ultraviolet light. It is possible. In this case, in order to include more oxygen in the water, before inserting the water into the short-wavelength ultraviolet irradiation device 12,
Bubbling (water and air are mixed by bubbling water) is preferable.

Also, the short-wavelength ultraviolet irradiation device 12
It is also possible to use an air pump (not shown) to insert air or water. Further, in the pump 11, it is preferable to use a gas-liquid mixing pump in consideration of a case where gas such as air is mixed into the pump together with water.

As described above, in the above-described embodiment, various devices and the like have been illustrated.
The device is not particularly limited to the one described above as long as it is applicable.

Here, a specific field of application of the above-described rapid water activation device according to the present invention will be described.

The fields of application of the rapid disinfection and activation device according to the present invention are as follows: 1) In the fisheries industry, disinfection of fish and shellfish washing water, seedling cultivation water, stockpile fish and shellfish water, fishing bait breeding water, etc. Activation.

2) For water supply, well water, elevated tank water,
Sterilization of food processing water and clean water of hotels and commercial kitchens.

3) Regarding sewage, sterilization of hospital wastewater, improvement of COD of industrial wastewater, sterilization of food processing wastewater, sterilization of public sewage, sterilization of settlement wastewater, neutralization of sewage.

4) As process water, soft drink water, food processing water, and marine processing water are sterilized and activated.

5) Other uses include sterilization of bath water, pool water, water in cooling water towers, water for hydroponic cultivation, and washing water for artificial rivers and ponds. In various fields, such as freshwater and seawater, it can be used regardless of the type of water.

Hereinafter, a specific embodiment in the above-mentioned application field will be described with reference to FIG.

FIG. 9 shows an apparatus 50 for sterilizing and activating aquarium water of a stockpiled live fish and shellfish. The configuration of the device 50 includes a filtration device 51 for filtering water before sending the water to the rapid sterilization and activation device 10 (see FIG. 5) according to the present invention,
It has a water receiving tank 52 for temporarily receiving the water filtered by the filtering device 51. Filtration device 51
Is not particularly limited, and may be any filtration device. A commonly used filtration device filled with activated carbon is preferred from the viewpoint of cost. As for the other parts, the basic structure is as follows.
0 (FIG. 5) is omitted here because it is the same as that of FIG. 5 (in the case where the tank water of the stockpiled fish and shellfish is sterilized and activated).
It is preferable to provide the photocatalyst functional body in the long wavelength ultraviolet irradiation device in addition to the medium wavelength ultraviolet irradiation device. Since fish take in seawater from gills and breathe, bacteria and the like contained in seawater are often accumulated in fish gills.
At this time, the most suitable is hypochlorous acid at an appropriate concentration to kill bacteria accumulated in fish gills. As described above, 310-36 in a long wavelength ultraviolet device.
When the ultraviolet light of 0 nm is strongly irradiated, when the seawater is activated, all the hypochlorous acid contained in the seawater is decomposed, and instead, it is not useful for fish, and the appropriate concentration of hypochlorous acid is supplied to the seawater. In order to leave, weaken the intensity of long wavelength ultraviolet light,
This is because a method of gradually activating seawater by the decomposition action of the photocatalytic functional body is preferable.

The water that has entered the apparatus through the inlet 53 passes through the filtration device 51, is temporarily stored in the water receiving tank 52, and enters the sterilization and activation device 10. Sterilization water activation device 10
The water that has entered inside is sterilized and activated,
Is more exhausted. The aseptic live water discharged from the discharge port 54 is supplied to an aquarium of a stockpiled live fish and shellfish (not shown).

As a result of using this apparatus, it was possible to sterilize and activate seawater for a long time without reducing the photocatalytic function.

Further, the processing speed was about 5 tons per hour before the method and apparatus according to the present invention, but by using the method and apparatus for rapid sterilization and activation according to the present invention. It is possible to process 20 tons of water per hour. By this, if the apparatus is the same size as the conventional one, it can treat water four times per unit time, and if there is no need to quadruple the processing amount per unit time, The size can be reduced to 1/4 as compared with the conventional device.

[0081]

According to the present invention, water, especially seawater, can be efficiently sterilized and activated in a short time by the sterilizing action of ozone generated by the ultraviolet irradiation step and the apparatus and the sterilizing action of the photocatalytic functional body in the present invention.

[Brief description of the drawings]

FIG. 1 is a diagram showing a state of a film formed by a low-temperature spraying method.

FIG. 2 is a diagram showing a state of a film formed by paint or printing ink.

FIG. 3 is a diagram showing a comparison between the effects of a conventional catalyst and the present invention as a photocatalyst.

FIG. 4 is a schematic sectional view showing an example of the rapid sterilization and activation device according to the present invention.

FIG. 5 is a longitudinal sectional view of the short wavelength ultraviolet irradiation device.

FIG. 6 is a longitudinal sectional view of a medium wavelength ultraviolet irradiation device.

FIG. 7 is a cross-sectional view of the medium wavelength ultraviolet irradiation device.

FIG. 8 is a cross-sectional view of the long wavelength ultraviolet irradiation device.

FIG. 9 is a schematic cross-sectional view of an apparatus for disinfecting and activating the tank water of the stockpiled live fish and shellfish.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Photocatalyst functional body 2 ... Optosemiconductor powder 3 ... Silicon microparticles 4 ... Adsorption material 5 ... Substrate 6 ... Photocatalyst particles 7 ... Titanium oxide particles 8 ... Silicon microparticles 9 ... Binder 10 ... Rapid disinfection and activation device 11 ... Pump 12 ... Short wavelength ultraviolet irradiation device 13 ... Pressure tank 14 ... Medium wavelength ultraviolet irradiation device 15 ... Long wavelength ultraviolet irradiation device 21, 32 ... Ultraviolet irradiation lamp 22 ... Quartz glass tube 23 ... Electrode 24 ... Ozone outlet 31, 41 ... Water inlet 33 ... Photocatalyst functional body 34 ... Cylindrical tube 35 ... Polyester nonwoven fabric photocatalyst functional body 36 ... Water outlet 40 ... Piping 50 ... Apparatus for disinfecting and activating aquarium water of stockpiling fish and shellfish 51 ... Filtering device 52 ... Water receiving tank 53 ... Suction Mouth 54 ... outlet

Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat II (reference) C02F 1/72 101 C02F 1/72 101 1/78 1/78 // A61L 2/10 A61L 2/10

Claims (4)

[Claims] At least a plurality of ultraviolet irradiation steps for separately irradiating a selected wavelength to water, wherein the ultraviolet irradiation step is formed at least from an optical semiconductor powder, silicon fine particles, and an adsorbing material. A method for rapidly disinfecting and activating water, wherein a photocatalytic function body is brought into contact with the water. 2. At least a plurality of ultraviolet irradiation devices for separately irradiating water with a selected wavelength, wherein the ultraviolet irradiation device is formed of at least an optical semiconductor powder, silicon fine particles, and an adsorption material. A quick disinfection activation device characterized by having a photocatalytic function body. 3. The ultraviolet irradiation device comprises: an ultraviolet irradiation device that functions as an ozone generator by irradiating a short wavelength; an ultraviolet irradiation device that irradiates a medium wavelength; and an ultraviolet irradiation device that irradiates a long wavelength. 3. The rapid sterilizing water activation according to claim 2, wherein at least the ultraviolet irradiation device for irradiating the medium wavelength is provided with a photocatalyst functional body formed of at least an optical semiconductor powder, silicon fine particles and an adsorbing material. apparatus. 4. The method according to claim 1, wherein the short wavelength is 183 nm to 184 nm.
The rapid bactericidal activation device according to claim 3, wherein the middle wavelength is 254 nm, and the long wavelength is 310 to 360 nm.