JP2001246368A - Water cleaning device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a water cleaning device having a function to remove hazardous components which cannot be adsorbed and removed by adsorbents by hazardous component decomposing and removing section by UV rays from an excimer lamp. SOLUTION: The hazardous component removing section of the water cleaning device, which passes the inflow city water through a turbid material removing section and the hazardous component removing section, then flows out the water, is the hazardous component decomposing and removing means by the UV rays from the excimer lamp and the hazardous component adsorbing and removing section means by the adsorbent.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a water purification apparatus for removing turbidity and harmful components contained in inflowing tap water.

[0002]

2. Description of the Related Art Tap water contains odorous components such as harmful organic substances, disinfectant and germicidal odor, and fine particle components. To make this tap water safer and more delicious,
A water purifier equipped with a turbidity removing section and a harmful component removing section is used. This type of water purifier is classified into a stationary type, a faucet direct connection type, an undersink type, a built-in faucet type, etc., depending on the installation mode, and most of them are provided with tap water raw water in the water purifier. It has a structure that discharges as purified water after purifying with a filter medium.

Conventionally, this type of filter medium has a function of removing water odor, mold odor, trihalomethane and the like by water using an adsorbent such as activated carbon, and removing bacteria and turbidity components by a hollow fiber membrane filter. Are known.

[0004]

However, harmful organic substances which can be adsorbed by activated carbon are generally hydrophobic organic substances and organic substances having non-polar functional groups. Therefore, organic substances having high hydrophilicity and polarity are adsorbed by activated carbon. Cannot be removed. However, tap water contains disinfecting by-products harmful to the human body, such as formaldehyde and dichloroacetic acid, and other harmful organic substances such as aldehyde-based or carboxylic acid-based hydrophilic and highly polar activated carbon that cannot be removed by adsorption.

Further, when hot water or hot water passes through the activated carbon in the harmful component removing section, the harmful components once adsorbed on the adsorbent undergo a desorption reaction, so that the harmful components are mixed in the purified water discharged. Occurs.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems. A turbidity removing section removes turbidity, and a harmful component removing section uses a harmful component decomposing means using ultraviolet rays from an excimer lamp and an adsorbent. It is a harmful component adsorption and removal means.By removing harmful components by two means, decomposition and adsorption, aldehyde-based and carboxylic acid-based harmful components that are harmful to the human body, such as aldehydes and carboxylic acids, can be removed. Another object of the present invention is to provide a water purification device capable of removing harmful components even with hot water.

[0007]

Means for Solving the Problems and Action / Effect The present invention has been made to solve the above-mentioned problems. According to the first aspect of the present invention, the inflowing tap water flows out after passing through the turbidity removing section and the harmful component removing section. In the water purifying apparatus, a harmful component removing unit is a means for decomposing and removing harmful components by ultraviolet rays from an excimer lamp and a means for adsorbing and removing harmful components by an adsorbent.

FIG. 1 shows the chemical energy of ultraviolet light. The shorter the wavelength of light, the stronger the chemical energy and reacts with the organic matter contained in tap water. Also, the bacteria in the water are killed by the ultraviolet light. FIG. 2 shows the bonding energies between atoms in various organic molecules. The bond between the atoms in the organic molecule is cut off and oxidatively decomposed by giving external energy equal to or higher than the bond energy to become harmless components such as carbon dioxide and water. Since the chemical energy of ultraviolet light is more than the energy of bonding between atoms in the main organic molecules, tap water is irradiated with ultraviolet light to decompose organic substances that are harmful components contained in water, It is a harmless component such as carbon and water. FIG. 3 shows an example of the relationship between the amount of ultraviolet irradiation and the amount of organic matter decomposed.

FIG. 4 shows the relationship between the ultraviolet output and the output wavelength of a mercury lamp and an excimer lamp which emit ultraviolet light. An excimer lamp can provide a single wavelength of ultraviolet light and an ultraviolet output with an electrically high conversion efficiency as compared with a mercury lamp.

FIG. 5 shows an example of a harmful component removal performance comparison diagram of a water purification device using only activated carbon and a water purification device provided with a harmful component removal section using activated carbon of the present invention and an excimer lamp. In the water purifier using only activated carbon, the harmful component removal rate (aldehyde-based harmful component) is around 30%,
The water purification device of the present invention shows a high removal rate of 85% or more.

With the water purification apparatus of the present invention, the turbidity of the inflowing tap water is removed by the turbidity removing section, and the harmful components are removed by two means, namely, decomposition removal by ultraviolet rays from an excimer lamp and adsorption removal by activated carbon. Therefore, harmful components that cannot be removed only by an adsorbent such as activated carbon can be removed. In addition, by using an excimer lamp and activated carbon in combination, the power consumption of the excimer lamp can be reduced,
It is economical. Further, since harmful components can be removed by the excimer lamp, water can be purified with hot water or hot water. In addition, the ultraviolet rays from the excimer lamp can remove harmful components and at the same time sterilize the water, so that a water purification device that can supply safe and delicious water can be provided.

In a preferred aspect of the present invention, the turbidity removing section is provided on the inflow side of the treated water from the harmful component decomposition removing section by ultraviolet rays from the excimer lamp and the adsorption removing section by the adsorbent. Provide a water purification device.

When the excimer lamp is used for decomposing harmful components of water, a turbid component adheres to the surface of the excimer lamp protective tube or the surface of the protective plate which comes into contact with water after many years of use, and the transmittance of ultraviolet light from the excimer lamp is increased. Decrease.
For this reason, the output of the ultraviolet light irradiated to the treated water decreases, and the performance of decomposing and removing harmful components decreases.

Further, in the conventional water purifying apparatus, a turbidity removing section is provided downstream of an adsorbent such as activated carbon.
A turbid substance adheres to the adsorbent. If turbid substances adhere to the adsorbent, the ability to adsorb harmful components is reduced.

According to the water purification apparatus of the present invention, the treated water from which the turbidity has been removed in the turbidity removing section passes through the harmful component decomposition removing section, so that the surface of the protective tube of the excimer lamp or the surface of the protective plate becomes turbid. No more adhesion. As a result, even when used for many years, since the ultraviolet ray transmittance of the protective tube or the protective plate does not decrease and the performance of decomposing and removing harmful components does not decrease, it is possible to supply safe water with turbidity and harmful components removed. A washing operation for removing turbidity adhered to the surface of the protective tube or the surface of the protective plate becomes unnecessary. Further, since the turbid matter does not adhere to the adsorbent, the harmful component removal life of the adsorbent is extended. As a result, economical and safe water can be supplied

According to a preferred aspect of the present invention, the harmful component adsorption / removal unit using an adsorbent is disposed on the inflow side of treated water from the harmful component decomposition / removal unit using ultraviolet light from an excimer lamp. Provide equipment.

In a conventional water treatment apparatus, when warm water or hot water passes through an adsorbent such as activated carbon, a desorbing reaction of harmful components once adsorbed on the adsorbent occurs, and therefore, the purified water discharged from the water is harmful. There is a problem that components are mixed. In addition, since bacteria grow on the adsorbent, the bacteria flow out downstream.

According to the water purifying apparatus of the present invention, since the harmful component adsorption / removal section by the adsorbent is disposed on the inflow side of the treated water from the harmful component decomposition / removal section by ultraviolet rays from the excimer lamp, Harmful components desorbed from the adsorbent when hot water or hot water passes through the material are also decomposed and removed in the harmful component decomposition and removal section by ultraviolet rays from the excimer lamp. Further, bacteria flowing out of the adsorbent are also sterilized by ultraviolet rays from the excimer lamp. As a result, safe water can be supplied.

Further, as a preferred embodiment of the present invention, there is provided means for detecting the flow rate of the treated water passing through the harmful component removing section, and the ultraviolet light output from the excimer lamp is controlled in accordance with the flow rate. Provide equipment.

In the conventional water purifying apparatus, the adsorption removal performance by the adsorbent and the biological purification ability in the biological purification method do not change according to the change in the flow rate of the treated water. Therefore, when the flow rate of the treated water is an appropriate amount, sufficient performance is exhibited. However, when the flow rate is increased, the harmful component removal performance becomes insufficient, and the harmful component is not sufficiently removed.

In the water purifying apparatus of the present invention, means for detecting the flow rate of the treated water passing through the harmful component removing section is provided, and the water purifying apparatus capable of controlling the ultraviolet output from the excimer lamp according to the flow rate. Therefore, even if the flow rate changes, the harmful component decomposition removal performance does not decrease. As a result, even if the flow rate of water changes, safe water from which turbid substances and harmful components have been removed can be supplied.

Further, as a preferred embodiment of the present invention, there is provided a water purification apparatus characterized by controlling the output of ultraviolet light emitted from an excimer lamp according to the water temperature measured by a water temperature measurement apparatus for measuring the temperature of treated water. provide.

In a conventional water purification apparatus, when hot water or hot water passes through an adsorbent such as activated carbon, a desorption reaction of harmful components once adsorbed on the adsorbent occurs, so that purified water discharged from the water is discharged. There is a problem that harmful components are mixed. The desorption reaction depends on the water temperature, and the desorption amount increases as the water temperature increases. Therefore, hot water cannot be used in a general water purification device.

The water purifying apparatus of the present invention is a water purifying apparatus capable of controlling the output of ultraviolet light emitted from an excimer lamp in accordance with the water temperature measured by a water temperature measuring apparatus for measuring the temperature of treated water. Therefore, even if the water temperature changes, the harmful components desorbed from the adsorbent can be decomposed and removed by increasing the ultraviolet output emitted from the excimer lamp. As a result, even if the water temperature changes, safe water from which turbid substances and harmful components are removed can be supplied.

Further, as a preferred embodiment of the present invention, there is provided a water purification apparatus, wherein the excimer lamp is a lamp which emits ultraviolet light having a main wavelength of 150 nm or more and 200 nm or less.

The shorter the wavelength of ultraviolet light, the higher the energy of photons. The energy of photons having a wavelength of 200 nm or less can easily break bonds such as carbon double bonds (C = C) in organic compounds that are difficult to decompose. . If the wavelength is 1
UV light of 50nm or less is used for protecting tube of water or excimer lamp,
Alternatively, the amount of ultraviolet light that contributes to decomposition of harmful components is extremely small because it is absorbed by the protective plate.

Therefore, a wavelength of 150 nm or more and 200 n
The harmful components in the treated water can be efficiently decomposed and removed by an excimer lamp having a main wavelength of ultraviolet light of m or less.

Further, as a preferred embodiment of the present invention, there is provided a water purifying apparatus characterized in that the excimer lamp is a lamp that emits ultraviolet light having a main wavelength of 172 nm.

A xenon excimer lamp having a main wavelength of 172 nm can stably output ultraviolet light having a higher output than other excimer lamps at a high electrical conversion efficiency. Can be decomposed and removed well.

According to a preferred aspect of the present invention, the excimer lamp is housed in a protective tube through which ultraviolet light can pass, or in a housing portion in which a part of the lamp housing portion is formed of a protective plate through which ultraviolet light can pass. The atmosphere is 300
A water purifying device characterized by having an atmosphere of Torr or lower or a gas containing no ultraviolet light from an excimer lamp as a main component.

The ultraviolet light output from the excimer lamp is:
It hardly passes through a protective tube or a protective plate made of general soda lime glass or the like. Also, the transmittance is low in glass containing a large amount of components other than silicon and oxygen, such as natural quartz glass, but the transmittance is low in synthetic quartz glass and magnesium fluoride glass containing only trace amounts of components other than silicon and oxygen. high. Further, when the atmosphere in the storage section is an atmosphere containing oxygen, the intensity of ultraviolet rays is reduced by being absorbed by oxygen molecules. Therefore, the pressure is preferably 300 Torr or less, or nitrogen gas which is a gas which does not absorb ultraviolet rays from an excimer lamp.

Accordingly, the protective tube through which the ultraviolet rays from the excimer lamp can pass, or a part of the lamp housing portion is housed in a housing portion formed of a protective plate through which the ultraviolet light can pass, and the atmosphere in the housing portion is 300 Torr or less. Alternatively, by using an atmosphere mainly containing a gas that does not absorb ultraviolet rays from an excimer lamp, harmful components in the treated water can be efficiently decomposed and removed.

In a preferred aspect of the present invention, the water contact portion on the inner wall of the harmful component removing portion to which the ultraviolet rays from the excimer lamp is irradiated is made of a material which reflects the ultraviolet rays from the excimer lamp. A purifying device is provided.

The ultraviolet light output from the excimer lamp is:
It is absorbed by the inner wall of the harmful component removing section. In order to react with harmful components contained in tap water and efficiently decompose and remove, reduce the amount of ultraviolet light absorbed by the harmful component removal section inner wall,
It is desirable to react with harmful components again by reflecting. Therefore, it is desirable that the material of the inner wall of the harmful component removing unit is made of aluminum, stainless steel, or the like having high ultraviolet reflectance.

Therefore, the harmful component is efficiently decomposed and removed by forming the liquid contact portion on the inner wall of the harmful component removing portion to which the ultraviolet light from the excimer lamp is irradiated with a material that reflects the ultraviolet light from the excimer lamp. Can supply safe water.

[0036]

Embodiments of the present invention will be described below with reference to the drawings. The turbidity removing portion used in this embodiment includes a granular filter, a metal, or a resin-made nonwoven fabric or metal, or a resin-made mesh filter, a sintered filter, a hollow fiber membrane filter, or a RO made of ceramic, metal, resin, or ceramic. A film or the like can be used. The turbidity removing filter is selected from the above according to the water quality and the use form.

FIG. 6 is a detailed view of the harmful component decomposition and removal section 1 used in the embodiment. Inside the harmful component decomposition and removal section 1,
In the protective tube 3 made of synthetic quartz glass through which ultraviolet rays can pass, 17
An excimer lamp 5 that outputs 2 nm ultraviolet rays is housed therein, and nitrogen gas is sealed in the excimer lamp 5 and the space 7 in the protective tube 3. The inner wall of the harmful component decomposition and removal unit 1
It is made of a material 8 having a high ultraviolet reflectance, such as aluminum or stainless steel. The excimer lamp 5 is electrically connected to the control device 9 and the power supply unit 11. Treated water 1
Numeral 3 passes through a harmful component decomposition processing unit 15 between the harmful component decomposition and removal unit 1 and the protective tube 3 in which the excimer lamp 5 is stored.

FIG. 7 is a detailed view of another embodiment of the harmful component decomposition and removal section 1 used in the embodiment. The excimer lamp 5 that outputs ultraviolet light of 172 nm has a side in contact with the water 13 to be treated.
It is housed in a protective plate 4 made of synthetic quartz glass through which ultraviolet rays pass, and a harmful component decomposition / removal unit 1 made of aluminum, stainless steel, or the like, which is a material 8 having a high ultraviolet reflectance. The space 7 in which the excimer lamp 5 is stored is filled with nitrogen gas that does not absorb ultraviolet rays. Treated water 1
The liquid contact part 17 in the harmful component decomposition and removal part 1 to which the part 3 contacts is made of aluminum, stainless steel, or the like, which is a material having a high ultraviolet reflectance. The excimer lamp 5 is electrically connected to the control device 9 and the power supply unit 11.

FIG. 8 is still another detailed view of the harmful component decomposition and removal section 1 used in the embodiment. The harmful component decomposition / removal unit 1 is provided in a water storage tank 55 for storing treated water. Also,
In the harmful component decomposition / removal unit 1, an excimer lamp 5 that outputs ultraviolet light of 172 nm is housed in a protective tube 3 made of synthetic quartz glass through which ultraviolet light passes, and the excimer lamp 5 and the space 7 in the protective tube 3 are filled with nitrogen. Gas is enclosed. The excimer lamp 5 is electrically connected to the control device 9 and the power supply unit 11. The water 13 to be treated is in contact with the outer wall of the protective tube 3 in which the excimer lamp 5 is stored.

In the embodiment of the water purifying apparatus described below, the harmful component decomposing / removing unit 1 has a protective tube 3 in which an excimer lamp 5 is housed, or a turbid substance adheres to a portion of the protective plate 4 which comes into contact with the water to be treated. In order to prevent a decrease in the output of ultraviolet light, a turbidity removing unit 19, a harmful component adsorption and removal unit using an adsorbent, and a harmful component decomposition and removal unit using ultraviolet light from an excimer lamp are arranged in this order on the flow path of the water to be treated. It is set up. Further, by providing the flow rate sensor 21, it becomes possible to change the excimer lamp to an ultraviolet output according to the lighting / extinguishing timing and the flow rate of the treated water. Further, by providing the water temperature measuring device, it is possible to change the ultraviolet output according to the water temperature.

FIG. 9 shows an embodiment of a water purification apparatus according to the present invention. The water purification device 2 is provided downstream of the tap water supply pipe 23 and the faucet opening / closing valve 25. Water purification device 2
Inside is a flow sensor 2 from the upstream faucet opening / closing valve 25 side.
1, water temperature measuring device 22, turbidity removing unit 19, harmful component adsorption removing unit 6, harmful component decomposition removing unit 1, purification treatment water spout 2
In the order of 7, water flow paths are provided. The control device 9 includes:
Hazardous component decomposition and removal section 1, power supply section 11, water temperature measurement device
And the flow rate sensor 21.
The flow rate sensor 21 and the water temperature measuring device 22 may be arranged in any of the water passages between the faucet opening / closing valve 25 and the purified water outlet 27.

Next, the operation of the first embodiment will be described. When the user opens the open / close valve 25 of the faucet, tap water flows from the tap water supply pipe 23 into the water purification device 2,
Flow rate sensor 21 → water temperature measuring device 22 → turbidity removing unit 19
The harmful component adsorption / removal unit 6 → the harmful component decomposition / removal unit 1 flows in this order, and purified water is discharged from the purified water outlet 27.

The opening of the faucet opening / closing valve 25 is detected by the flow sensor 21, and the electric energy of the power supply unit 11 is supplied to the harmful component decomposition / removal unit 1 via the control device 9 in accordance with the flow rate. Ultraviolet light is irradiated on the water from the lamp. In addition, the electric energy of the power supply unit 11 is controlled according to the water temperature measured by the water temperature measurement device.
Power is supplied to the harmful component decomposition / removal unit 1 via the water according to the water temperature, and ultraviolet light is irradiated on the water from an excimer lamp. The turbidity contained in the water is removed by the turbidity removing unit 19, and the harmful components are removed by the harmful component adsorption removing unit 6 and the harmful component decomposition removing unit 1, and the purified water is discharged through the water discharge port 27.

By this step, the turbidity of tap water is removed, and harmful components are removed by adsorption and decomposition means, and at the same time, safe water sterilized by ultraviolet rays can be supplied.

[Brief description of the drawings]

FIG. 1 shows the relationship between chemical energy of ultraviolet rays and wavelength.

FIG. 2 shows the bonding energy between atoms in an organic molecule.

FIG. 3 shows the relationship between the amount of ultraviolet irradiation and the amount of organic matter decomposed.

FIG. 4 shows the relationship between the ultraviolet output and the output wavelength of a mercury lamp and an excimer lamp.

FIG. 5 is a relationship between a treatment amount and a harmful component removal rate in a case where tap water containing an aldehyde component is purified by a purification device for water only with activated carbon and a purification device for water of the present invention.

FIG. 6 is a detailed view of a harmful component decomposition and removal unit used in the embodiment of the present invention.

FIG. 7 is a detailed view of another embodiment of the harmful component decomposition / removal unit used in the embodiment of the present invention.

FIG. 8 is a detailed view of still another embodiment of the harmful component decomposition / removal unit used in the embodiment of the present invention.

FIG. 9 is a configuration diagram of an embodiment of a water purification device according to the present invention.

[Explanation of symbols]

 1: Hazardous component decomposition / removal section 2: Water purification device 3: Protection tube 4: Protective plate 5: Excimer lamp 6: Hazardous component adsorption / removal section 7: Space 8: Material with high ultraviolet reflectance 9: Control device 11: Power supply Part 13: Water to be treated 15: Decomposition treatment part for harmful components 17: Liquid contact part 19: Turbidity removing part 21: Flow rate sensor 22: Water temperature measuring device 23: Water supply pipe 25: Water tap open / close valve 27: Purified water spout 55 :Water storage tank

Continuation of the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat II (reference) C02F 9/00 502 C02F 9/00 502E 502H 502N 503 503A 504 504B 504C 504D 504E (72) Inventor Shinyo Endo Kitakyushu, Fukuoka Prefecture (B) Inventor Shigeru Ando 2-1-1 Nakajima 2-chome Nakajima, Kokurakita-ku, Fukuoka-shi F-Term (reference) 3B116 AA46 AB53 BC01 4D024 AA02 AB04 AB07 AB11 BA02 BC01 CA13 DA03 DA05 DB03 DB05 DB10 DB24 4D037 AA02 AB03 AB11 AB14 BA18 BB01 CA01 CA02 CA03 CA12 4D050 AA04 AB06 AB14 AB16 BB01 BC09 BD02 BD06 BD08 CA06 CA09 CA15

Claims (9)

[Claims] 1. An apparatus for purifying water which flows out of a flowing tap water after passing through a turbidity removing section and a harmful component removing section, wherein the harmful component removing section comprises a means for decomposing harmful components by ultraviolet rays from an excimer lamp and an adsorbent. A water purification device, characterized in that the device is a means for adsorbing and removing harmful components. 2. The water purifying apparatus according to claim 1, wherein the turbidity removing unit is disposed on the inflow side of the treated water from the harmful component decomposition removing unit using ultraviolet light from the excimer lamp and the adsorption removing unit using the adsorbent. The water purification device according to claim 1, wherein: 3. The water purifier according to claim 1, wherein the harmful component adsorption / removal unit using the adsorbent is disposed on the inflow side of the treated water from the harmful component decomposition / removal unit using ultraviolet light from the excimer lamp. The water purification device according to claim 1 or 2, wherein 4. The water purifying apparatus according to claim 1, further comprising means for detecting a flow rate of the treated water passing through the excimer lamp, and controlling an ultraviolet output from the excimer lamp according to the flow rate. The water purifier according to any one of claims 1 to 3. 5. The water purifier according to claim 1, wherein an ultraviolet output emitted from an excimer lamp is controlled according to a water temperature measured by a water temperature measuring device for measuring a temperature of the treated water. The water purifier according to any one of claims 1 to 4. 6. An excimer lamp having a wavelength of 150 nm or more and
The water purifying apparatus according to any one of claims 1 to 5, wherein the lamp is a lamp that emits ultraviolet light having a main wavelength of 00 nm or less. 7. The water purifying apparatus according to claim 1, wherein the excimer lamp is a lamp that emits ultraviolet light having a main wavelength of 172 nm. 8. The excimer lamp is housed in a protective tube through which ultraviolet light can pass, or in a housing portion in which a part of the lamp housing portion is formed of a protective plate through which ultraviolet light can pass, and the atmosphere in the housing portion is 300 Torr or less. The water purifying apparatus according to any one of claims 1 to 7, wherein the atmosphere is mainly composed of a gas that does not absorb ultraviolet rays from an ultraviolet lamp. 9. The method according to claim 1, wherein the liquid contacting part on the inner wall of the germicidal component supply unit irradiated with ultraviolet rays from the excimer lamp is made of a material reflecting ultraviolet rays from the ultraviolet lamp. A water purification device according to claim 1.