WO2010147544A1 - Method and device for treatment of water by exposure to uv radiation - Google Patents

Method and device for treatment of water by exposure to uv radiation Download PDF

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Publication number
WO2010147544A1
WO2010147544A1 PCT/SE2010/050665 SE2010050665W WO2010147544A1 WO 2010147544 A1 WO2010147544 A1 WO 2010147544A1 SE 2010050665 W SE2010050665 W SE 2010050665W WO 2010147544 A1 WO2010147544 A1 WO 2010147544A1
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WO
WIPO (PCT)
Prior art keywords
water
carbon dioxide
light
radicals
exposing
Prior art date
Application number
PCT/SE2010/050665
Other languages
French (fr)
Inventor
Torkel Elgh
Original Assignee
Wallenius Water Aktiebolag
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Wallenius Water Aktiebolag filed Critical Wallenius Water Aktiebolag
Priority to EP10789822A priority Critical patent/EP2443066A4/en
Publication of WO2010147544A1 publication Critical patent/WO2010147544A1/en

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Classifications

    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/30—Treatment of water, waste water, or sewage by irradiation
    • C02F1/32—Treatment of water, waste water, or sewage by irradiation with ultraviolet light
    • C02F1/325—Irradiation devices or lamp constructions
    • A—HUMAN NECESSITIES
    • A23—FOODS OR FOODSTUFFS; TREATMENT THEREOF, NOT COVERED BY OTHER CLASSES
    • A23L—FOODS, FOODSTUFFS, OR NON-ALCOHOLIC BEVERAGES, NOT COVERED BY SUBCLASSES A21D OR A23B-A23J; THEIR PREPARATION OR TREATMENT, e.g. COOKING, MODIFICATION OF NUTRITIVE QUALITIES, PHYSICAL TREATMENT; PRESERVATION OF FOODS OR FOODSTUFFS, IN GENERAL
    • A23L2/00—Non-alcoholic beverages; Dry compositions or concentrates therefor; Their preparation
    • A23L2/52—Adding ingredients
    • A23L2/54—Mixing with gases
    • A—HUMAN NECESSITIES
    • A23—FOODS OR FOODSTUFFS; TREATMENT THEREOF, NOT COVERED BY OTHER CLASSES
    • A23L—FOODS, FOODSTUFFS, OR NON-ALCOHOLIC BEVERAGES, NOT COVERED BY SUBCLASSES A21D OR A23B-A23J; THEIR PREPARATION OR TREATMENT, e.g. COOKING, MODIFICATION OF NUTRITIVE QUALITIES, PHYSICAL TREATMENT; PRESERVATION OF FOODS OR FOODSTUFFS, IN GENERAL
    • A23L2/00—Non-alcoholic beverages; Dry compositions or concentrates therefor; Their preparation
    • A23L2/70—Clarifying or fining of non-alcoholic beverages; Removing unwanted matter
    • A—HUMAN NECESSITIES
    • A23—FOODS OR FOODSTUFFS; TREATMENT THEREOF, NOT COVERED BY OTHER CLASSES
    • A23L—FOODS, FOODSTUFFS, OR NON-ALCOHOLIC BEVERAGES, NOT COVERED BY SUBCLASSES A21D OR A23B-A23J; THEIR PREPARATION OR TREATMENT, e.g. COOKING, MODIFICATION OF NUTRITIVE QUALITIES, PHYSICAL TREATMENT; PRESERVATION OF FOODS OR FOODSTUFFS, IN GENERAL
    • A23L3/00—Preservation of foods or foodstuffs, in general, e.g. pasteurising, sterilising, specially adapted for foods or foodstuffs
    • A23L3/26—Preservation of foods or foodstuffs, in general, e.g. pasteurising, sterilising, specially adapted for foods or foodstuffs by irradiation without heating
    • A23L3/28—Preservation of foods or foodstuffs, in general, e.g. pasteurising, sterilising, specially adapted for foods or foodstuffs by irradiation without heating with ultraviolet light
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/30—Treatment of water, waste water, or sewage by irradiation
    • C02F1/32—Treatment of water, waste water, or sewage by irradiation with ultraviolet light
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/68—Treatment of water, waste water, or sewage by addition of specified substances, e.g. trace elements, for ameliorating potable water
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/72—Treatment of water, waste water, or sewage by oxidation
    • C02F1/725—Treatment of water, waste water, or sewage by oxidation by catalytic oxidation
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2201/00—Apparatus for treatment of water, waste water or sewage
    • C02F2201/009—Apparatus with independent power supply, e.g. solar cells, windpower, fuel cells
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2201/00—Apparatus for treatment of water, waste water or sewage
    • C02F2201/32—Details relating to UV-irradiation devices
    • C02F2201/322—Lamp arrangement
    • C02F2201/3222—Units using UV-light emitting diodes [LED]
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2301/00—General aspects of water treatment
    • C02F2301/02—Fluid flow conditions
    • C02F2301/024—Turbulent
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2305/00—Use of specific compounds during water treatment
    • C02F2305/02—Specific form of oxidant
    • C02F2305/023—Reactive oxygen species, singlet oxygen, OH radical
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2307/00—Location of water treatment or water treatment device
    • C02F2307/06—Mounted on or being part of a faucet, shower handle or showerhead
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
    • Y02A20/00—Water conservation; Efficient water supply; Efficient water use
    • Y02A20/20—Controlling water pollution; Waste water treatment
    • Y02A20/208—Off-grid powered water treatment
    • Y02A20/211—Solar-powered water purification
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
    • Y02A20/00—Water conservation; Efficient water supply; Efficient water use
    • Y02A20/20—Controlling water pollution; Waste water treatment
    • Y02A20/208—Off-grid powered water treatment
    • Y02A20/212—Solar-powered wastewater sewage treatment, e.g. spray evaporation

Definitions

  • the present invention relates to a purifying device for treating water, and in particular carbonated water.
  • Water is a very natural and important component for all life on the planet and it has become increasingly important to have pure, drinkable water around the globe. In fact fresh water will be one of the most important issues for the world community to handle in the future.
  • the bottled water entails high energy consumption and environmental impact due to the costs for producing the product water/ container but also the costs for transporting the bottled water from the producer to the consumer.
  • the aim of the present invention is to remedy the drawbacks of the state of the art and to provide a device for producing pure, carbonated water locally.
  • a method for treating tap water comprising means for exposing running tap water including UV generating means capable of exposing the water to UV light for creating radicals, which radicals treat the water, characterised in the introduction of carbon dioxide downstream said UV generating means, which carbon dioxide creates a scattering of said UV light for enhancing the treatment as well as carbonating said water for drinking purposes.
  • said carbon dioxide promotes the production of radicals in that oxygen in the carbon dioxide is converted to ozone by said UV light, which UV light at the same time breaks down the ozone to radicals.
  • the great advantage with the present invention is that the water flowing from the tap water faucet is treated in order to greatly improve the quality of the water, i.e. really making it drinkable directly from the tap, and also carbonated.
  • the further advantage is that the added carbon dioxide also, apart from the carbonating aspect, also acts as an enhancer of the treatment process in that it promotes the scattering of the light, thereby improving the efficiency of the treatment and also causing turbulence in the water which further adds to the improved efficiency. Furthermore, the presence of carbon dioxide provides added oxygen, which may be converted to ozone by the UV light, which ozone is broken down to radicals by the UV light. Thereby the treatment process is even more improved.
  • the present invention both provides a purified drinking water that may be carbonated, whereby the introduction of carbon dioxide has multiple functions.
  • Fig. 1 shows schematically a tap water arrangement comprising the present invention
  • Fig. 2 shows schematically a variant of the tap water arrangement of Fig. 1.
  • the device according to the present invention comprises a water treatment unit.
  • a tap water faucet 10 is mounted on a fixed surface such as a sink 12 or the like.
  • the faucet is connected to a tap water piping system 14, providing tap water to the faucet.
  • the faucet is further provided with a knob 16 for handling a valve inside the faucet, for controlling the flow of water through the faucet.
  • the present invention comprises a water treatment unit 20 arranged in the flow of the tap water, in the embodiment shown before the valve as seen in the direction of flow, even though the water treatment unit could be placed after the valve, as will become apparent from the following description.
  • the treatment unit comprises a number of UV-generating means 22 capable of generating UV in the range between 180 - 400 nm.
  • the UV generating means are capable of generating UV light of 183.7 nm and 254 nm.
  • the wavelength of 183.7 nm in particular converts the oxygen in the medium to ozone molecules.
  • the ozone molecules formed are at the same time decomposed by radiation within the above mentioned range, especially at a wavelength of 254 nm, which causes the ozone formed to break down to form atomic oxygen.
  • the UV-generating means comprise small UV- generating Light Emitting Diods (LED's) capable of generating UV light in the above range and in particular 183.7 nm and 254 nm.
  • the LED's could be arranged in a tubular housing 24 and arranged around the circumference so that the whole volume of the housing is irradiated.
  • catalysts 26 are arranged in the housing so that they are exposed to the UV-light.
  • a number of materials could be used as catalysts comprise metal and/ or metal oxide, such as noble metals, aluminium oxide, titanium oxide silicon oxide and mixtures thereof.
  • the catalytic material could cover the inner surfaces of the housing but also be arranged onto a water permeable structure such as a mesh, non-woven fibres, and the like, and placed either transversal to the direction of flow, or in the direction of flow.
  • a water permeable structure such as a mesh, non-woven fibres, and the like
  • the material of the permeable structure could be quartz glass, which increases the possibilities of spreading the UV light inside the housing.
  • the UV lamps are connected via electrical conduits 28 to a power source.
  • the power source comprises an electric generator 30 arranged in a housing part of the tap water faucet.
  • an impeller 32 is connected to the shaft of the electric generator.
  • the impeller could either be attached directly on the shaft of the generator or via a suitable transmission.
  • the impeller is placed in an impeller housing 34 in the tap water faucet, where the impeller housing is arranged in the water flow through the faucet.
  • a suitable sealing is arranged between the impeller housing and the generator housing.
  • Another embodiment of the present invention could comprise a battery pack (not shown) instead or in addition to the generator.
  • a switch is provided on the tap water faucet, preferably activated when the water is turned on, so that the power from the batteries to the lamps is switched on when the water is switched on.
  • the lamps it is of course possible to connect the lamps to the mains of the building, preferably via some suitable transformer.
  • the water tap is arranged with a connection 40 to which a cartridge of carbon dioxide 42 can be attached.
  • the connection is arranged to fit suitable size and type of cartridge.
  • the connection preferably is arranged with some type of valve 44 for turning on and off the supply of carbon dioxide.
  • the faucet knob 16 When the faucet knob 16 is turned on, the water starts to flow through the impeller housing 34, whereby the impeller 32 starts to rotate. This in turn causes the generator 30 to rotate and to deliver power to the UV-lamps 22, whereby they are lit and the treatment process as described above is started.
  • the power delivered from the generator is proportional to the flow speed, in that a low flow speed generates a low rotational speed of the generator, while a high flow generates a high rotational speed, providing more power to the lamps. This is an advantage with this embodiment because a higher flow requires more output from the lamps.
  • the valve 42 controlling the supply of carbon dioxide when the valve 42 controlling the supply of carbon dioxide is turned to open, carbon dioxide is supplied to the running water.
  • the supply of carbon dioxide is arranged upstream of the lamps.
  • the bubbles of carbon dioxide pass into the light of the UV-lamps, they create a scattering effect of the light and the ray path through the water will be more zigzag like. This increases the path in water for reaching all regions of the water volume passing through and the effective light absorption will be high.
  • the introduction of carbon dioxide bubbles also creates turbulence in the liquid which also promotes the scattering of light.
  • the UV-radiation of these bubbles will also cause a generation of ozone in that the UV-light will to some extent convert the oxygen in the water to ozone, which ozone then is broken down to radicals.
  • a very efficient purifying action is obtained by the combination of introducing carbon dioxide and the treatment by UV-radiation.

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  • Engineering & Computer Science (AREA)
  • Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Polymers & Plastics (AREA)
  • Food Science & Technology (AREA)
  • Nutrition Science (AREA)
  • Toxicology (AREA)
  • Hydrology & Water Resources (AREA)
  • Environmental & Geological Engineering (AREA)
  • Water Supply & Treatment (AREA)
  • Organic Chemistry (AREA)
  • Physical Water Treatments (AREA)
  • Treatment Of Water By Oxidation Or Reduction (AREA)

Abstract

The present invention relates to a method for treating tap water, comprising the steps of exposing running tap water to UV radiation with UV generating means capable of exposing the water to UV light for creating radicals, which radicals treat the water. The invention is characterised in the introduction of carbon dioxide bubbles upstream said UV generating means. The carbon dioxide bubbles create a scattering of said UV light for enhancing the treatment, and they also carbonate the water for drinking purposes.

Description

Method and device for treatment of water by exposure to UV radiation.
TECHNICAL AREA
The present invention relates to a purifying device for treating water, and in particular carbonated water.
TECHNICAL BACKGROUND
Water is a very natural and important component for all life on the planet and it has become increasingly important to have pure, drinkable water around the globe. In fact fresh water will be one of the most important issues for the world community to handle in the future.
Regarding the water consumption in many countries in the world, the uses of bottled and also often carbonated water has increased dramatically during a number of years due to the quality of the bottled water in comparison to the tap water, but also due to the increased desire for carbonated water.
The bottled water entails high energy consumption and environmental impact due to the costs for producing the product water/ container but also the costs for transporting the bottled water from the producer to the consumer.
Some attempts have been made in order to reduce need for transporting water to the consumer. One type is the carbonating devices that could be placed in the kitchen. Such a device comprises a stand to which a carbon dioxide cartridge is attached. A certain type of bottle filled with tap water is then attached to the stand, after which the water can be carbonated from the carbon dioxide cartridge. Even though this has led to some acceptance from customers, it is regarded as a bit laborious with the handling of the filling of bottles. Also the need for special bottles is regarded as a drawback. A recent attempt to facilitate the local production of carbonated water is to implement a carbon dioxide cartridge in a kitchen water tap, whereby the tap water is carbonated directly and it is possible to obtain carbonated water from the tap. So far however, these types of water taps, as well as the additional equipment needed, is rather expensive and is not yet for every household.
A further drawback with the above mentioned systems is that they require a good tap water quality otherwise the water will not taste good even if carbonated. This limits the use of these systems to countries/ regions with purified water of good quality.
BRIEF DESCRIPTION OF THE INVENTION
The aim of the present invention is to remedy the drawbacks of the state of the art and to provide a device for producing pure, carbonated water locally.
This aim is obtained by the features of the independent patent claim. Preferable embodiments of the present invention form the subject of the dependent patent claims.
According to a main aspect of the invention, it is characterised by a method for treating tap water, comprising means for exposing running tap water including UV generating means capable of exposing the water to UV light for creating radicals, which radicals treat the water, characterised in the introduction of carbon dioxide downstream said UV generating means, which carbon dioxide creates a scattering of said UV light for enhancing the treatment as well as carbonating said water for drinking purposes.
According to another aspect of the invention, said carbon dioxide promotes the production of radicals in that oxygen in the carbon dioxide is converted to ozone by said UV light, which UV light at the same time breaks down the ozone to radicals.
The advantages with the present invention are several. The introduction of carbon dioxide in the tap water faucet greatly reduces the environmental and economical impact that otherwise is the case with bottled carbonated water.
However the great advantage with the present invention is that the water flowing from the tap water faucet is treated in order to greatly improve the quality of the water, i.e. really making it drinkable directly from the tap, and also carbonated.
The further advantage is that the added carbon dioxide also, apart from the carbonating aspect, also acts as an enhancer of the treatment process in that it promotes the scattering of the light, thereby improving the efficiency of the treatment and also causing turbulence in the water which further adds to the improved efficiency. Furthermore, the presence of carbon dioxide provides added oxygen, which may be converted to ozone by the UV light, which ozone is broken down to radicals by the UV light. Thereby the treatment process is even more improved.
Thus, the present invention both provides a purified drinking water that may be carbonated, whereby the introduction of carbon dioxide has multiple functions.
These and other aspects of and advantages with the present invention will become apparent from the following detailed description and from the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS
In the following detailed description of the invention, reference will be made to the accompanying drawings, of which
Fig. 1 shows schematically a tap water arrangement comprising the present invention, and
Fig. 2 shows schematically a variant of the tap water arrangement of Fig. 1.
DETAILED DESCRIPTION OF THE INVENTION The device according to the present invention comprises a water treatment unit. In the embodiment shown in the figures a tap water faucet 10 is mounted on a fixed surface such as a sink 12 or the like. The faucet is connected to a tap water piping system 14, providing tap water to the faucet. The faucet is further provided with a knob 16 for handling a valve inside the faucet, for controlling the flow of water through the faucet. These components are all very well known to any person.
According to the present invention, it comprises a water treatment unit 20 arranged in the flow of the tap water, in the embodiment shown before the valve as seen in the direction of flow, even though the water treatment unit could be placed after the valve, as will become apparent from the following description.
The treatment unit comprises a number of UV-generating means 22 capable of generating UV in the range between 180 - 400 nm. In particular the UV generating means are capable of generating UV light of 183.7 nm and 254 nm. The wavelength of 183.7 nm in particular converts the oxygen in the medium to ozone molecules. The ozone molecules formed are at the same time decomposed by radiation within the above mentioned range, especially at a wavelength of 254 nm, which causes the ozone formed to break down to form atomic oxygen.
In order to have a compact treatment unit in connection with a tap water faucet, the UV-generating means comprise small UV- generating Light Emitting Diods (LED's) capable of generating UV light in the above range and in particular 183.7 nm and 254 nm. The LED's could be arranged in a tubular housing 24 and arranged around the circumference so that the whole volume of the housing is irradiated.
Further, in order to increase the amount of radicals generated in the liquid, catalysts 26 are arranged in the housing so that they are exposed to the UV-light. A number of materials could be used as catalysts comprise metal and/ or metal oxide, such as noble metals, aluminium oxide, titanium oxide silicon oxide and mixtures thereof.
The catalytic material could cover the inner surfaces of the housing but also be arranged onto a water permeable structure such as a mesh, non-woven fibres, and the like, and placed either transversal to the direction of flow, or in the direction of flow. For example the material of the permeable structure could be quartz glass, which increases the possibilities of spreading the UV light inside the housing.
According to the present invention, the UV lamps are connected via electrical conduits 28 to a power source. According to one example shown, the power source comprises an electric generator 30 arranged in a housing part of the tap water faucet. To the shaft of the electric generator, an impeller 32 is connected. The impeller could either be attached directly on the shaft of the generator or via a suitable transmission. The impeller is placed in an impeller housing 34 in the tap water faucet, where the impeller housing is arranged in the water flow through the faucet. A suitable sealing is arranged between the impeller housing and the generator housing. Another embodiment of the present invention could comprise a battery pack (not shown) instead or in addition to the generator. If power from the batteries is used to drive the lamps, then a switch is provided on the tap water faucet, preferably activated when the water is turned on, so that the power from the batteries to the lamps is switched on when the water is switched on. Within the present invention it is of course possible to connect the lamps to the mains of the building, preferably via some suitable transformer.
Further, according to the present invention, the water tap is arranged with a connection 40 to which a cartridge of carbon dioxide 42 can be attached. In this aspect, the connection is arranged to fit suitable size and type of cartridge. The connection preferably is arranged with some type of valve 44 for turning on and off the supply of carbon dioxide.
When the faucet knob 16 is turned on, the water starts to flow through the impeller housing 34, whereby the impeller 32 starts to rotate. This in turn causes the generator 30 to rotate and to deliver power to the UV-lamps 22, whereby they are lit and the treatment process as described above is started. Thus, as soon as water starts to flow through the tap water faucet, the water flowing through it is treated. Further, the power delivered from the generator is proportional to the flow speed, in that a low flow speed generates a low rotational speed of the generator, while a high flow generates a high rotational speed, providing more power to the lamps. This is an advantage with this embodiment because a higher flow requires more output from the lamps.
According to the invention, at the same time, when the valve 42 controlling the supply of carbon dioxide is turned to open, carbon dioxide is supplied to the running water. As seen from the drawing, the supply of carbon dioxide is arranged upstream of the lamps. When the bubbles of carbon dioxide pass into the light of the UV-lamps, they create a scattering effect of the light and the ray path through the water will be more zigzag like. This increases the path in water for reaching all regions of the water volume passing through and the effective light absorption will be high. The introduction of carbon dioxide bubbles also creates turbulence in the liquid which also promotes the scattering of light.
Apart from the light- scattering effect that the carbon dioxide bubbles create, the UV-radiation of these bubbles will also cause a generation of ozone in that the UV-light will to some extent convert the oxygen in the water to ozone, which ozone then is broken down to radicals. Thus a very efficient purifying action is obtained by the combination of introducing carbon dioxide and the treatment by UV-radiation.
It is to be understood that the embodiment described above and shown in the drawings is to be regarded as non-limiting examples only and that it may be modified in many ways within the scope of the patent claims.

Claims

PATENT CLAIMS
1. Method for treating tap water, comprising the steps of exposing running tap water to UV radiation with UV generating means capable of exposing the water to UV light for creating radicals, which radicals treat the water, characterised in the introduction of carbon dioxide bubbles upstream said
UV generating means, which carbon dioxide bubbles create a scattering of said UV light for enhancing the treatment as well as carbonating said water for drinking purposes.
2. Method according to claim 1 , wherein said carbon dioxide promotes the production of radicals in that oxygen in the carbon dioxide is converted to ozone by said UV light, which UV light at the same time breaks down the ozone to radicals.
3. Method according to claim 1 , wherein the carbon dioxide is introduced as small bubbles, preferably in the region of 0,01 to 5 mm.
4. Method according to any of the preceding claims, characterised in causing a turbulence in the water.
5. Device for treating tap water, comprising means for exposing running tap water to UV radiation, which exposing means include UV generating means capable of exposing the water to UV light for creating radicals, which radicals treat the water, characterised in means for introducing carbon dioxide bubbles upstream said UV generating means, which carbon dioxide bubbles create a scattering of said UV light for enhancing the treatment as well as carbonating said water for drinking purposes.
PCT/SE2010/050665 2009-06-15 2010-06-15 Method and device for treatment of water by exposure to uv radiation WO2010147544A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP10789822A EP2443066A4 (en) 2009-06-15 2010-06-15 Method and device for treatment of water by exposure to uv radiation

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE0950459A SE534496C2 (en) 2009-06-15 2009-06-15 Method for treating tap water with UV radiation
SE0950459-8 2009-06-15

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Cited By (2)

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EP2649012A2 (en) * 2010-12-07 2013-10-16 Biological Illumination LLC Led fluid purification system and method
WO2018037938A1 (en) * 2016-08-23 2018-03-01 日機装株式会社 Running water sterilization device and running water sterilization method

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US20050247614A1 (en) * 2004-05-10 2005-11-10 Imi Cornelius (Uk) Limited Water treatment
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SE0950459A1 (en) 2010-12-16
EP2443066A1 (en) 2012-04-25
SE534496C2 (en) 2011-09-13

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