WO2005037411A1 - Method and applicator for cleaning a contaminated air stream - Google Patents

Method and applicator for cleaning a contaminated air stream Download PDF

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Publication number
WO2005037411A1
WO2005037411A1 PCT/DK2004/000710 DK2004000710W WO2005037411A1 WO 2005037411 A1 WO2005037411 A1 WO 2005037411A1 DK 2004000710 W DK2004000710 W DK 2004000710W WO 2005037411 A1 WO2005037411 A1 WO 2005037411A1
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Prior art keywords
fluid
source
air
applicator
ultraviolet light
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PCT/DK2004/000710
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French (fr)
Inventor
Jimmy Larsen
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Jimco A/S
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.)
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Publication date
Application filed by Jimco A/S filed Critical Jimco A/S
Publication of WO2005037411A1 publication Critical patent/WO2005037411A1/en

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/007—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by irradiation
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2259/00—Type of treatment
    • B01D2259/80—Employing electric, magnetic, electromagnetic or wave energy, or particle radiation
    • B01D2259/804—UV light

Definitions

  • the invention relates to a method for cleaning a contaminated air stream by means of at least one source of ultraviolet light placed in the air stream.
  • Organic substances in the form of vapours or particles are to a large extent created as undesired products in connection with many production processes within the industry, for example incomplete combustion where volatile organic hydrocarbons are released because the hydrocarbons are not completely converted to C0 2 .
  • Other examples where organic substances are submitted to the surroundings are preparation and use of lacquer and paint, production of metal and plastic, bio-gas plants, agriculture and also large parts of the food industry.
  • volatile organic compounds are chemical substances that are toxic and carcinogenic, and available information establishes that long-term exposures to volatile organic hydrocarbons may cause chronic health effects e.g., structural damage to lung tissue, accelerated decline in baseline lung function, eye and skin irritation and nausea. It is therefore normally not allowed to leak air contaminated with the organic substances to the surroundings. Therefore, many governments have prescribed that the contaminated air must be purified before it is led into the surroundings.
  • Ozone is a highly reactive substance, which is why it is such a powerful and efficient cleaner and purifier.
  • review of scientific research shows that, for many of the chemicals commonly found in industry, the reaction process with ozone might take months or years (Boeniger, 1995) .
  • ozone may also increase indoor concentrations of formic acid (Zhang and Lioy, 1994) , both of which can irritate the lungs if produced in sufficient amounts.
  • the new and unique whereby this is obtained according to the invention, is that a fluid is added to the surface of and/or the surrounding air of the at least one source of ultraviolet light.
  • the method requires the use of photons in the ultraviolet spectral range .
  • Ultraviolet light is useful for disinfection purposes. When a strong enough ultraviolet light is present, it becomes useful in the destruction of contaminants. Almost all contaminants are organic, such as toxic volatile organic compounds, dust particles like dander, hair, and biological contaminants like bacteria, viruses, and fungi.
  • Ultraviolet light with enough energy such as in the 100-280 nanometer wavelength range can break down the electron bonds of an organic molecule, however, it can also initiate the formation of a highly energized gaseous state, which is highly reactive and contains excited atoms and molecules, ionized gases, radicals, and free electrons. This primarily involves the photodissociation of molecular oxygen leading to the formation of highly oxidizing species, such as atomic oxygen, molecular singlet oxygen and ozone. These reactive species interact with contaminants converting most to carbon dioxide and water.
  • the ultraviolet light also creates electron ejection of organic molecules that produces additional free radical creation.
  • the radicals react with oxygen producing hydroperoxide ions, with the whole process creating a chain reaction with organic compounds triggering further oxidation.
  • the inventors have now surprisingly found that when additional hydrogen is added, e.g. in the form of a fluid comprising hydrogen, such as water, the highly oxidative hydroxyl radicals is created.
  • the hydroxyl radicals are stable and very destructive to organic contaminants because they steal hydrogen atoms from the organic materials, leaving decaying carbon ions, e.g:
  • the theft of hydrogen from organic molecules forms even stronger hydroxyl radical bonds with even higher oxidation potential .
  • the hydroxyl radicals are furthermore, in contrast to ozone (Shaughnessy, et al. 1994), effective in removing carbon monoxide by converting it into carbon dioxide:
  • the method according to the invention can decontaminate air a lot faster and more efficiently than with the known purifying apparatus which only uses ozone.
  • the fluid is added as water vapour which both have a high partial pressure and also a very large reactive surface enabling a high production rate of hydroxyl radicals.
  • the temperature of the submitted fluid can be set to enable the optimal purification of the respective contaminated air stream.
  • the temperature can be regulated according to the degree of contamination.
  • vaporised or atomised water further has the advantage that in addition to producing hydroxyl radicals it also cools the contaminated air momentarily due to the very large total surface of the water. This will enable a better work performance and faster and better cleaning of the contaminated air stream.
  • the water can e.g. be heated before submitting it to the UV light source or the applicator could generate steam by heating.
  • the atomised or vaporised water further has the advantage that the reactive water surface is extremely large, enabling a faster production of hydroxyl radicals.
  • the invention also relates to an applicator for applying the fluid to the surface and/or the surroundings of the at least one source of ultraviolet light placed in the contaminated air stream.
  • the applicator comprises a separate fluid source and a device for supplying fluid from said source to the surface of and/or the air surrounding the at least one source of ultraviolet light.
  • the device for supplying fluid could advantageously comprise at least one atomizer for during operation of the apparatus, submitting atomized fluid from the fluid source to the air stream and/or against the surface of the at least one source of ultraviolet light.
  • the atomizer could be a nozzle and the device could comprise a pump for pumping fluid from the fluid source to the nozzle under pressure. This will ensure a complete atomization of the water and the nozzles can furthermore be placed in relation to the UV light source so that efficient cooling and thereby production of ozone ' and hydroxyl radicals is achieved.
  • the atomizer can be designed as a cup or disc.
  • the disc can then be rotated about its own axis with such speed that the fluid is hurled from the cup or disc in atomized form.
  • the applicator will discharge atomised water with different degrees of atomisation, which advantageously covers a broad spectrum. This will generate a finely atomised water mist, which is filled in with larger water drops for carrying the finely atomised water with it and thereby considerably increase the range of this.
  • This embodiment further has the advantage that it can use e.g. rainwater as water source ensuring that the costs are kept to a minimum. Such rainwater could have a content of contaminated substances . However where such substances could clqse the aforementioned nozzles, the cups or discs would not be influenced. Furthermore, as the produced ozone and hydroxyl radicals can remove almost all organic substances from the rainwater during the decontamination of the air, a few extra contaminations would not influence the performance of the air cleaning apparatus.
  • the applicator according to the invention can be used in all conventional types of air purification apparatus comprising at least one source of ultraviolet light.
  • the applicator can advantageously comprise means for attachment to the apparatus. All conventional means known by the person skilled in the art, such as screws, nuts and bolts, clips, etc. could be used for this purpose.
  • Fig. 1 shows a first embodiment of an applicator according to the invention placed in an air purification apparatus
  • Fig. 2 shows a second embodiment of an applicator according to the invention placed in an air purification apparatus
  • Fig 3 shows a sectional view taken along the line III - III of fig. 2.
  • Fig. 1 schematically shows an air purification apparatus 1 for cleaning the contaminated air stream.
  • the apparatus comprises a number of UV-lamps 2, which during operation emit ultraviolet light.
  • the contaminated air stream passes over the UV-lamps as indicated with the arrows.
  • the applicator 3 comprises a separate fluid source 4 containing the water and a number of nozzles 5 for supplying atomized water from said fluid source to the surface 6 of the UV-lamps and/or to the air 7 surrounding the UV-lamps 2.
  • the nozzles are interconnected to each other and to the fluid source via a fluid conduit 8.
  • a pump 9 for driving water under pressure from the fluid source 4 to the nozzles 5 is inserted into the fluid conduit.
  • the water can be kept under pressure in the fluid source 4.
  • a pressure-regulating valve (not shown) for regulating the pressure in the fluid source 4
  • a non-return valve (not shown) for preventing back flow in the fluid conduit.
  • Fig. 2 shows another embodiment, which is a modification of the embodiment shown in fig. 1.
  • Fig. 2 shows another embodiment, which is a modification of the embodiment shown in fig. 1.
  • the same reference numerals are therefore used.
  • the contaminated air is in this case passes along the UV-lamps 2 as indicated by the arrows thereby enabling the contaminated air to be in contact with the oxidizing substances for a longer period of time than when being passed across. In this way a more efficient air cleaning is achieved since the organic material reacts several times with the different oxidising substances.
  • the nozzles 2 of the applicator 3 can in such case be arranged in a corresponding circle with e.g. a nozzle between each of two UV-lamps. This will guarantee a uniform distribution of the atomised water.
  • the ultraviolet light will immediately start to break down the electron bonds of the organic molecules contained in the contaminated air and initiate the formation of the highly energized gaseous state, which contains excited atoms and molecules, such as atomic oxygen, molecular singled oxygen and ozone, ionized gases, radicals, and free electrons.
  • excited atoms and molecules such as atomic oxygen, molecular singled oxygen and ozone, ionized gases, radicals, and free electrons.
  • the applicator 3 supplys the nozzles 5 with water under pressure whereby the water enters the surface 6 and/or the surroundings 7 of the UV-lamps 3 in atomised form.
  • the atomised water will not only deliver the extra hydrogens which are necessary for the highly oxidative and stable hydroxyl radicals to be generated but it will also ensure that the optimal working temperature of the UV-lamps is maintained.

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  • Chemical & Material Sciences (AREA)
  • Health & Medical Sciences (AREA)
  • Toxicology (AREA)
  • Engineering & Computer Science (AREA)
  • Analytical Chemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Disinfection, Sterilisation Or Deodorisation Of Air (AREA)

Abstract

A method and an applicator is used for cleaning a contaminated air stream by means of UV-lamps placed in the air stream whereby the oxygen is converted into ozone. By applying water to the surface of the UV-lamps and/or to the air stream, hydrogen is generated whereby highly oxidative hydroxyl radicals also are generated. These reactive species interact with organic contaminants converting them into carbon dioxide and water, whereby it is ensured that the decontamination of the contaminated air is performed faster and more efficiently than it is possible by means of the known purifying apparatus which generating ozone only for use in the cleaning process.

Description

Method and applicator for cleaning a contaminated air stream
The invention relates to a method for cleaning a contaminated air stream by means of at least one source of ultraviolet light placed in the air stream.
Organic substances in the form of vapours or particles are to a large extent created as undesired products in connection with many production processes within the industry, for example incomplete combustion where volatile organic hydrocarbons are released because the hydrocarbons are not completely converted to C02. Other examples where organic substances are submitted to the surroundings are preparation and use of lacquer and paint, production of metal and plastic, bio-gas plants, agriculture and also large parts of the food industry.
Most volatile organic compounds are chemical substances that are toxic and carcinogenic, and available information establishes that long-term exposures to volatile organic hydrocarbons may cause chronic health effects e.g., structural damage to lung tissue, accelerated decline in baseline lung function, eye and skin irritation and nausea. It is therefore normally not allowed to leak air contaminated with the organic substances to the surroundings. Therefore, many governments have prescribed that the contaminated air must be purified before it is led into the surroundings.
This purification normally takes place by filtering the contaminated air in, e.g. grease filters and carbon filters. Mechanical filters of this type are, however, rather expensive in use as they need to be cleaned at short intervals and frequently have to be replaced.
It is furthermore well known to use ozone for removing organic substances from contaminated air. Ozone is a highly reactive substance, which is why it is such a powerful and efficient cleaner and purifier. However, review of scientific research shows that, for many of the chemicals commonly found in industry, the reaction process with ozone might take months or years (Boeniger, 1995) .
It has e.g. been shown that ozone is not effective in removing carbon monoxide (Shaughnessy, et al . 1994) or formaldehyde (Esswein and Boeniger, 1994) .
Furthermore, in a laboratory experiment were ozone was mixed with chemicals from new carpet, it was shown that even though ozone reduced many of these chemicals, including those, which can produce new carpet odor, the reaction produced a variety of aldehydes. This resulted in that the total concentration of organic chemicals in the air increased rather than decreased after the introduction of ozone. (Weschler, et . al . , 1992).
In addition to aldehydes (Weschler, et . al . , 1992), ozone may also increase indoor concentrations of formic acid (Zhang and Lioy, 1994) , both of which can irritate the lungs if produced in sufficient amounts.
Some of the potential by-products produced by ozone's reactions with other chemicals are themselves very reactive and capable of producing irritating and corrosive by-products (Weschler and Shields 1997) .
It is therefore an aspect of the present invention to provide a method of the kind mentioned in the opening paragraph capable of providing a safer and more effective purification of air contaminated with organic components than previously known.
It is another aspect of the present invention to provide an applicator for performing said method, which has a simple, inexpensive design with no components that gradually would become ineffective through wear.
It is a third aspect of the invention to provide an applicator, which can be installed easily and quickly, and which furthermore is easily activated.
The new and unique whereby this is obtained according to the invention, is that a fluid is added to the surface of and/or the surrounding air of the at least one source of ultraviolet light.
This will ensure that not only ozone is created, but also hydroxyl radicals, both of which are very powerful oxidising substances, resulting in, that the organic substances contaminating the air stream are removed faster and more efficiently, as two oxidising substances are working in synergy. Their interaction produces a unique and a superlative way of cleaning air of contaminants.
The method requires the use of photons in the ultraviolet spectral range .
Ultraviolet light is useful for disinfection purposes. When a strong enough ultraviolet light is present, it becomes useful in the destruction of contaminants. Almost all contaminants are organic, such as toxic volatile organic compounds, dust particles like dander, hair, and biological contaminants like bacteria, viruses, and fungi.
Ultraviolet light with enough energy such as in the 100-280 nanometer wavelength range can break down the electron bonds of an organic molecule, however, it can also initiate the formation of a highly energized gaseous state, which is highly reactive and contains excited atoms and molecules, ionized gases, radicals, and free electrons. This primarily involves the photodissociation of molecular oxygen leading to the formation of highly oxidizing species, such as atomic oxygen, molecular singlet oxygen and ozone. These reactive species interact with contaminants converting most to carbon dioxide and water.
The ultraviolet light also creates electron ejection of organic molecules that produces additional free radical creation. The radicals react with oxygen producing hydroperoxide ions, with the whole process creating a chain reaction with organic compounds triggering further oxidation.
The inventors have now surprisingly found that when additional hydrogen is added, e.g. in the form of a fluid comprising hydrogen, such as water, the highly oxidative hydroxyl radicals is created.
03 + light -> 0* (0* Excited) + 02
0* + H20 -^ 2 OH« (hydroxyl radical)
Even though the decontamination of organic substances with ozone generates some H20, this has proven to be in too small a quantity to create enough hydroxyl radicals to obtain a measurable decontamination effect in the air. It is therefore necessary to supply additional hydrogen.
The hydroxyl radicals are stable and very destructive to organic contaminants because they steal hydrogen atoms from the organic materials, leaving decaying carbon ions, e.g:
CH4(g) + HO.(g) ^ H3C.(g) + H20
The theft of hydrogen from organic molecules forms even stronger hydroxyl radical bonds with even higher oxidation potential . The hydroxyl radicals are furthermore, in contrast to ozone (Shaughnessy, et al. 1994), effective in removing carbon monoxide by converting it into carbon dioxide:
CO(g) + HO- (g) ■» C02(g) + H(g)
The process of creating ozone and hydroxyl radicals turns into a chain reaction resulting in the continual decay of organic material .
By adding water to the source of ultraviolet light the method according to the invention can decontaminate air a lot faster and more efficiently than with the known purifying apparatus which only uses ozone.
It should be noted that it is preferable to use water, as this is a cheap and accessible source of hydrogen. However, any kind of fluid containing hydrogen can be used in the present invention.
It has been found that the production rate of hydroxyl radical increases when the partial pressure of the fluid increases.
According to the Clausius-Clapeyron equation, which gives the exact value for the increase of partial pressure, the pressure increases as the temperature increases .
Thus, in a preferred embodiment the fluid is added as water vapour which both have a high partial pressure and also a very large reactive surface enabling a high production rate of hydroxyl radicals.
This also means that increasing the temperature of the water vapour can regulate the production rate of the hydroxyl radical. So according to the specific use of the method according to the inventions the temperature of the submitted fluid can be set to enable the optimal purification of the respective contaminated air stream. Thus, the temperature can be regulated according to the degree of contamination.
The best production of hydroxyl radicals are obtained if the fluid is applied at a partial pressure between X and Y.
As examples can be mentioned that at 60°C the saturated water vapour pressure is 149 torr and about 60% of singlet oxygen will go to generation of hydroxyl radicals, at 70°C it is 71% of the singlet oxygen, which will go to the production.
In extremely warm working places, such as kitchens, were some cooking applications, such as charbroiling, produces so much grease and were the contaminated air stream reached temperatures around 300°C, ultraviolet light and ozone alone are not very cost effective in cleaning the contaminated air.
Here the use of vaporised or atomised water further has the advantage that in addition to producing hydroxyl radicals it also cools the contaminated air momentarily due to the very large total surface of the water. This will enable a better work performance and faster and better cleaning of the contaminated air stream.
In very cold surroundings the water can e.g. be heated before submitting it to the UV light source or the applicator could generate steam by heating.
The atomised or vaporised water further has the advantage that the reactive water surface is extremely large, enabling a faster production of hydroxyl radicals.
The invention also relates to an applicator for applying the fluid to the surface and/or the surroundings of the at least one source of ultraviolet light placed in the contaminated air stream.
This is achieved according to the invention in that the applicator comprises a separate fluid source and a device for supplying fluid from said source to the surface of and/or the air surrounding the at least one source of ultraviolet light.
In order to obtain the atomized fluid, the device for supplying fluid could advantageously comprise at least one atomizer for during operation of the apparatus, submitting atomized fluid from the fluid source to the air stream and/or against the surface of the at least one source of ultraviolet light.
In a first embodiment the atomizer could be a nozzle and the device could comprise a pump for pumping fluid from the fluid source to the nozzle under pressure. This will ensure a complete atomization of the water and the nozzles can furthermore be placed in relation to the UV light source so that efficient cooling and thereby production of ozone' and hydroxyl radicals is achieved.
In another embodiment the atomizer can be designed as a cup or disc. The disc can then be rotated about its own axis with such speed that the fluid is hurled from the cup or disc in atomized form.
The applicator will discharge atomised water with different degrees of atomisation, which advantageously covers a broad spectrum. This will generate a finely atomised water mist, which is filled in with larger water drops for carrying the finely atomised water with it and thereby considerably increase the range of this. This embodiment further has the advantage that it can use e.g. rainwater as water source ensuring that the costs are kept to a minimum. Such rainwater could have a content of contaminated substances . However where such substances could clqse the aforementioned nozzles, the cups or discs would not be influenced. Furthermore, as the produced ozone and hydroxyl radicals can remove almost all organic substances from the rainwater during the decontamination of the air, a few extra contaminations would not influence the performance of the air cleaning apparatus.
The applicator according to the invention can be used in all conventional types of air purification apparatus comprising at least one source of ultraviolet light. In such cases the applicator can advantageously comprise means for attachment to the apparatus. All conventional means known by the person skilled in the art, such as screws, nuts and bolts, clips, etc. could be used for this purpose.
The invention will be explained in greater detail below, describing embodiments by way of example only with reference to the drawing, in which
Fig. 1 shows a first embodiment of an applicator according to the invention placed in an air purification apparatus,
Fig. 2 shows a second embodiment of an applicator according to the invention placed in an air purification apparatus, and
Fig 3 shows a sectional view taken along the line III - III of fig. 2.
In the following it is supposed that the fluid used for cleaning a contaminated stream of air is water and that the source of ultraviolet light is one or more UV-lamps. Fig. 1 schematically shows an air purification apparatus 1 for cleaning the contaminated air stream. The apparatus comprises a number of UV-lamps 2, which during operation emit ultraviolet light. The contaminated air stream passes over the UV-lamps as indicated with the arrows.
The applicator 3 comprises a separate fluid source 4 containing the water and a number of nozzles 5 for supplying atomized water from said fluid source to the surface 6 of the UV-lamps and/or to the air 7 surrounding the UV-lamps 2. The nozzles are interconnected to each other and to the fluid source via a fluid conduit 8. A pump 9 for driving water under pressure from the fluid source 4 to the nozzles 5 is inserted into the fluid conduit.
Alternatively the water can be kept under pressure in the fluid source 4. In this case there can advantageously be placed a pressure-regulating valve (not shown) for regulating the pressure in the fluid source 4 and a non-return valve (not shown) for preventing back flow in the fluid conduit.
Fig. 2 shows another embodiment, which is a modification of the embodiment shown in fig. 1. For analogous parts the same reference numerals are therefore used.
The contaminated air is in this case passes along the UV-lamps 2 as indicated by the arrows thereby enabling the contaminated air to be in contact with the oxidizing substances for a longer period of time than when being passed across. In this way a more efficient air cleaning is achieved since the organic material reacts several times with the different oxidising substances.
When the UV-lamps 2 are placed in a circle as shown in fig. 3 a highly oxidizing environment will be generated between the
UV-lamps. The nozzles 2 of the applicator 3 can in such case be arranged in a corresponding circle with e.g. a nozzle between each of two UV-lamps. This will guarantee a uniform distribution of the atomised water.
When the contaminated air enters the apparatus 1 the ultraviolet light will immediately start to break down the electron bonds of the organic molecules contained in the contaminated air and initiate the formation of the highly energized gaseous state, which contains excited atoms and molecules, such as atomic oxygen, molecular singled oxygen and ozone, ionized gases, radicals, and free electrons.
The applicator 3 according to the invention supplys the nozzles 5 with water under pressure whereby the water enters the surface 6 and/or the surroundings 7 of the UV-lamps 3 in atomised form. The atomised water will not only deliver the extra hydrogens which are necessary for the highly oxidative and stable hydroxyl radicals to be generated but it will also ensure that the optimal working temperature of the UV-lamps is maintained.
This entire process turns into a chain reaction and results in the continual decay of organic material as the synergy of the different oxidizing substances produces a unique and a superlative way of cleaning air of contaminants.

Claims

Claims .
1. A method for cleaning a contaminated air stream by means of at least one source of ultraviolet light placed in the air stream, characterized in that a fluid is added to the surface of and/or the air surrounding the at least one source of ultraviolet light.
2. A method according to claim 1, characterized in that the fluid is atomized or vaporized.
3. A method according to claim 1 or 2 , characterized in that fluid is applied at a partial pressure between X and Y.
4. A method according to claim 1, 2 or 3, characterized in that the air surrounding the at least one source of ultraviolet light is higher than 50°C.
5. A method according to any of the claims 1 - 4, characterized in that the fluid consists of water or of water mixed with at least one other fluid.
6. An applicator for use in the method according to any of the claims 1 - 5, characterized in that the applicator comprises a separate fluid source and a device for applying fluid from said separate fluid source onto the surface of the source of ultraviolet light surface and/or into the contaminated air stream.
7. An applicator according to claim 6, characterized in that the device comprises at least one atomizer for atomizing fluid supplied to the at least one atomizer from the separate fluid source.
8. An applicator according to claim 7, characterized in that the at least one atomizer is a nozzle and that the applying device comprises a pump for supplying said nozzle with fluid under pressure from the separate fluid source.
9. An applicator according to claim 7, characterized in that the at least one atomizer is shaped as a cup or disc which during operation is rotating about an axis with such a speed that fluid is hurled from the cup or disc in atomized form and that the applying device comprises means for supplying said cup or disc with fluid from the separate fluid source.
10.An applicator according to any of the claims 6 - 9, characterized that the source of ultraviolet light comprises at least one UV-lamp.
11.An applicator according to any of the claims 6 - 10, characterized in that the applicator comprises means for attachment to an air purification apparatus comprising at least one source of ultraviolet light.
12.An air purification apparatus which comprises a first section with an opening, which is connected to a source for contaminated air, a second section with a number of sheets for making the air stream change direction at least one time, a third section with at least on source of ultraviolet light, a fourth section through which the purified air is released into the surroundings, characterized in, that a fluid is added to the surface of and/or the air surrounding the at least one source of ultraviolet light. 15
Reference list:
Boeniger, Mark F. 1995. Use of Ozone Generating Devices to Improve Indoor Air Quality. America Industrial Hygiene Association Journal . 56: 590-598.
Ess ein, Eric J.; Boeniger, Mark F. 1994. Effects of an Ozone- Generating Air-Purifying Device on Reducing Concentrations of Formaldehyde in Air. Applied Occupational Environmental Hygiene . 9(2):139-146
Sha ghnessy, Richard, J.; Levetin, Estelle; Blocker, Jean; and Sublette, Kerry L. 1994. Effectiveness of Portable Indoor Air Cleaners: Sensory Testing Results. Indoor Air. Journal of the International Society of Indoor Air Quality and Climate. 4:179-188.
Weschler, Charles J.; Hodgson Alfred T.; and Wooley, John D. 1992. Indoor Chemistry: Ozone, Volatile Organic Compounds, and Carpets. Environmental Science and Technology. 26(12) :2371- 2377.
Weschler, Charles J; Shields, Helen C. 1997. Potential Reactions Among Indoor Pollutants. Atmospheric Environment . 31(21) :3487-3495.
Zhang, Junfeng and Lioy, Paul J. 1994. Ozone in Residential Air: Concentrations, I/O Ratios, Indoor Chemistry, and Exposures. Indoor Air. Journal of the International Society of Indoor Air Quality and Climate. 4:95-102.
13
13. A use of an applicator or method according to claim 1 - 10, characterized in that the applicator or method is used for removing and/or destroying organic impurities in a contaminated air stream.
14. A use according to claim 11, characterized in that the contaminated air stream comes from an area where food is prepared.
PCT/DK2004/000710 2003-10-15 2004-10-15 Method and applicator for cleaning a contaminated air stream WO2005037411A1 (en)

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DKPA200301516 2003-10-15

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109140601A (en) * 2018-02-09 2019-01-04 农业部农业生态与资源保护总站 A kind of plant microecosystem air cleaning unit
CN110180298A (en) * 2019-05-14 2019-08-30 淄博棠鸣机电科技有限公司 A kind of exhaust processor with cooling function
CN110451702A (en) * 2019-08-01 2019-11-15 武汉华川环境有限公司 A kind of deodorizing device for sewage treatment

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2437110A1 (en) * 1974-08-01 1976-02-12 Spiess C F & Sohn Decompsn. of org. substances - present in inert gases in the form of odorous or otherwise undesirable vapours or aerosols
US5256379A (en) * 1991-12-23 1993-10-26 Deloach Anthony Apparatus and method for removing hydrocarbons from airstream
CA2178258A1 (en) * 1995-06-06 1996-12-07 Phillip A. Lincoln Method and apparatus for removing volatile organic compounds by cold oxidation

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2437110A1 (en) * 1974-08-01 1976-02-12 Spiess C F & Sohn Decompsn. of org. substances - present in inert gases in the form of odorous or otherwise undesirable vapours or aerosols
US5256379A (en) * 1991-12-23 1993-10-26 Deloach Anthony Apparatus and method for removing hydrocarbons from airstream
CA2178258A1 (en) * 1995-06-06 1996-12-07 Phillip A. Lincoln Method and apparatus for removing volatile organic compounds by cold oxidation

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109140601A (en) * 2018-02-09 2019-01-04 农业部农业生态与资源保护总站 A kind of plant microecosystem air cleaning unit
CN110180298A (en) * 2019-05-14 2019-08-30 淄博棠鸣机电科技有限公司 A kind of exhaust processor with cooling function
CN110451702A (en) * 2019-08-01 2019-11-15 武汉华川环境有限公司 A kind of deodorizing device for sewage treatment

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