US20030143111A1 - Methods of using chlorine dioxide as a fumigant - Google Patents
Methods of using chlorine dioxide as a fumigant Download PDFInfo
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- US20030143111A1 US20030143111A1 US09/997,694 US99769401A US2003143111A1 US 20030143111 A1 US20030143111 A1 US 20030143111A1 US 99769401 A US99769401 A US 99769401A US 2003143111 A1 US2003143111 A1 US 2003143111A1
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- chlorine dioxide
- dioxide gas
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- fumigation
- requiring fumigation
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61L—METHODS OR APPARATUS FOR STERILISING MATERIALS OR OBJECTS IN GENERAL; DISINFECTION, STERILISATION OR DEODORISATION OF AIR; CHEMICAL ASPECTS OF BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES; MATERIALS FOR BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES
- A61L9/00—Disinfection, sterilisation or deodorisation of air
- A61L9/015—Disinfection, sterilisation or deodorisation of air using gaseous or vaporous substances, e.g. ozone
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61L—METHODS OR APPARATUS FOR STERILISING MATERIALS OR OBJECTS IN GENERAL; DISINFECTION, STERILISATION OR DEODORISATION OF AIR; CHEMICAL ASPECTS OF BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES; MATERIALS FOR BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES
- A61L2/00—Methods or apparatus for disinfecting or sterilising materials or objects other than foodstuffs or contact lenses; Accessories therefor
- A61L2/16—Methods or apparatus for disinfecting or sterilising materials or objects other than foodstuffs or contact lenses; Accessories therefor using chemical substances
- A61L2/20—Gaseous substances, e.g. vapours
Definitions
- ETO ethylene oxide
- formaldehyde vaporized peroxide
- ozone ethylene oxide
- ETO epoxyethane
- formaldehyde formaldehyde
- ozone vaporized peroxide
- Each of these fumigants has disadvantages that limit their utility in fumigating large volumes, e.g. buildings or vehilces.
- Ethylene oxide is a flammable and explosive gas that is classified as both a mutagen and a carcinogen.
- the use of ethylene oxide as a fumigant requires extensive post detoxification and clean up procedures.
- Formaldehyde is potentially explosive and an occupational carcinogen.
- formaldehyde as a fumigant requires extensive post detoxification and clean up procedures.
- Vaporized peroxide reacts generally with all organic compounds in the environment to be fumigated, thus having a high demand for fumigant. Vaporized peroxide is effective in fumigating spaces of volume less than 1200 ft 3 . Ozone reacts generally with all organic compounds in the environment to be fumigated, and has the shortest half-life of these fumigants, making ozone even less suitable than vaporized peroxide for the fumigation of large volumes.
- Chlorine dioxide is recognized as an effective sterilant. However, no guidance is available regarding the use of chlorine dioxide for the fumigation of large volumes. Sodium hypochorite is known to be useful and effective for scrubbing down surfaces. However, such procedures using sodium hypochlorite are labor intensive, affect appearance and integrity of materials scrubbed, and are not as suitable for large scale use as are the gas methods. Chlorine gas is also not suitable due to the health hazards, high corrosivity of the gas, and the production of chlorinated organic by-products.
- Chlorine dioxide which is a selective oxidant and a protein synthesis deactivator, has been reported to be efficacious against Bacillus subtilis (a gram positive, chemoorganotroph spore former similar to Bacillus anthracis ) under controlled laboratory medical sterilizer conditions.
- the present invention provides methods for the effective large-scale use of chlorine dioxide to allow for gaseous penetration of contents included within in a large enclosed volume requiring fumigation and sterilization in an environmentally safe manner.
- the present invention provides a method comprising the steps of:
- the chlorine dioxide gas is removed from the volume requiring fumigation with the same equipment that was used to introduce the chlorine dioxide gas.
- the present invention provides a process comprising producing chlorine dioxide by using an apparatus such as a chlorine dioxide generator.
- the chlorine dioxide is generated directly as a gas.
- the chlorine dioxide is generated as a solution of chlorine dioxide gas in a liquid.
- the liquid is water.
- chlorine dioxide solution equilibrium partial pressure is optimally kept below about 26,000 ppmV.
- the generated chlorine dioxide is transferred directly, or alternatively, indirectly via a storage tank, to a high gas:liquid ratio emitter.
- the emitter is an apparatus such as a gas/liquid contactor having a high efficiency mist eliminator and very low liquid/gas rates.
- the emitter is an apparatus such as a stripper.
- the emitter is operated to maintain the gaseous chlorine dioxide concentration substantially below the explosion limit of chlorine dioxide in the air.
- the emitters Prior to generation of the chlorine dioxide, the emitters are used with water alone to raise the relative humidity in the volume requiring fumigation, with adjustment of the temperature. Alternatively, the humidification and fumigation can be done simultaneously using the same apparatus by the appropriate adjustment in the temperature of chlorine dioxide solution.
- the treatment is conducted in reduced illumination, preferably substantially dark, to minimize the decomposition of chlorine dioxide to chlorine.
- the process is monitored with the use of an infrared camera or similar device.
- chlorine dioxide should be of the highest possible purity. Specifically, chlorine gas should be present in the introduced gas at a level less than about 5%, preferably less than about 0.5%. Suitably chlorine dioxide gas is present at a concentration in the introduced gas of at least 90%, preferably at least 95%, and optimally at least 99%.
- the variable generation rate of chlorine dioxide gas is initiated.
- the initial rate is high to provide sufficient chlorine dioxide to penetrate the various surfaces demands within the volume requiring fumigation.
- This rate is predetermined to accommodate the surface demand as well as to provide the initial charge of the volume requiring fumigation to a predetermined chlorine dioxide residual level.
- the chlorine dioxide generation rate is then reduced appropriately to maintain the predetermined chlorine dioxide concentration in the air of the volume requiring fumigation for a predetermined time. This can be achieved by a number of means, such as lowering the concentration of chlorine dioxide in the solution that is fed to the emitter, or lowering the flow rate of the chlorine dioxide solution to the emitter.
- the maintenance level of chlorine dioxide gas concentration is determined to compensate for the decay or loss rate from the volume requiring fumigation.
- the volume requiring fumigation is preferably to be at slightly negative pressure to areas outside of it and efforts are made to seal off the volume through the use of strippable sealant, such as foam that sets up hard. Once the required time weighted average concentration and contact time are attained, then the generation of chlorine dioxide is stopped.
- the generator, storage and emitter are then purged with fresh water. Once this is complete, the water is injected with an alkalizing and dechlorinating agent or other functional chemistry (e.g., ascorbic acid), that will absorb the chlorine dioxide.
- This scrubbing solution is then fed to the emitter and with the blowers still in operation, the emitter begins to scrub chlorine dioxide out of the environmental air composition within the said volume that has been fumigated. This process is continued until the environmental air composition within the volume that has been fumigated is returned to acceptable limits for reopening to the exterior environment and rehabitation.
- the emitters can be located inside or outside of the volume requiring fumigation. However, it is highly preferred to locate the emitter inside the volume requiring fumigation, since then no contaminated air is allowed to leave the volume requiring fumigation.
- FIG. 1 is a schematic illustration of one embodiment of the present invention.
- FIG. 1 schematically illustrates one embodiment of the invention.
- the invention is practiced using a chlorine dioxide gas generator 100 that provides chlorine dioxide dissolved in water 180 directly 160 , or alternatively, indirectly 140 via storage 200 , to a emitter 300 comprising a blower 320 that produces chlorine dioxide gas in air 360 for treatment of building areas and/or a heating, ventilation and air conditioning (HVAC) return air system of a building 400 .
- a chlorine dioxide gas generator 100 that provides chlorine dioxide dissolved in water 180 directly 160 , or alternatively, indirectly 140 via storage 200
- a emitter 300 comprising a blower 320 that produces chlorine dioxide gas in air 360 for treatment of building areas and/or a heating, ventilation and air conditioning (HVAC) return air system of a building 400 .
- HVAC heating, ventilation and air conditioning
- the chlorine dioxide generator 100 receives an input 150 that is a mixture of city makeup water 140 and chemicals 120 or 130 .
- Suitable mixing means are used to combine the city makeup water 140 and chemicals 120 or 130 .
- Metering means are used to regulate the amounts and proportions of the city makeup water 140 and chemicals 120 or 130 that are combined.
- water alone is provided to the input 150 of the chlorine dioxide generator 100 , in order to adjust the relative humidity of the volume to be treated.
- chlorine dioxide precursor chemicals 120 are combined with the city makeup water 140 .
- Several chemical means of generating chlorine dioxide, and their corresponding chlorine dioxide precursor chemicals are known in the art, and the choice of suitable means and chemicals is within the abilities of the skilled artisan.
- the output of the chlorine dioxide generator 100 can be routed directly 160 to provide chlorine dioxide dissolved in water 180 to the emitter 300 .
- the output of the chlorine dioxide generator can be routed 140 to a storage means 200 , from which chlorine dioxide dissolved in water 180 can be routed to the emitter 300 .
- the emitter 300 removes chlorine dioxide from the water and delivers chlorine dioxide in air 360 by duct means to the volume to be fumigated, in general, building areas and/or a HVAC return air system.
- Duct means includes, but is not limited to, temporary or permanent ductwork, pipes, hoses and the like.
- Water 380 recovered from the emitter can be recycled and combined by mixing means with city makeup water 140 and chemicals 120 or 130 to provide input 150 to the chlorine dioxide generator 100 .
- the chlorine dioxide generator 100 , storage 200 and emitter 300 are flushed with water alone.
- detoxification chemicals 130 are combined with water to provide the input to the chlorine dioxide generator 100 .
- the environment within the enclosed volume of a trailer is fumigated and restored to habitability as follows. Initially, the environment is climatized to a temperature of 70-80° F. and a relative humidity of 60-80%. During treatment, chlorine dioxide is introduced into the volume to be fumigated and maintained at a residual level of 500 ppm V for 10 hours. In other embodiments, the residual chlorine dioxide level is maintained at about 750 ppm V, about 1000 ppm V or about 3000 ppm V and the treatment time is in the range of about 8 to about 12 hours. Typically, if the enclosed volume is 2280 ft 3 , air is suitably recirculated at 5 CFM. The treatment is conducted in reduced illumination, preferably substantially dark, to minimize the decomposition of chlorine dioxide to chlorine. Suitably chlorine dioxide gas is present at a concentration in the introduced gas of at least 90%, preferably at least 95%, and optimally at least 99%.
- the chlorine dioxide should be of the highest possible purity. Specifically, chlorine gas should be present in the introduced gas at a level less than about 5%, preferably less than about 0.5% Efficacy is measured by percent inactivation of Bacillus subtilis spores used as monitors. The contents of the trailer are inspected to determine the discoloration and functionality of all the material placed in trailer, including drapes, chairs, files, mail and other documents and computers. Apart from a slight discoloration, no discernible effects on carpets, drapes, furniture and office equipment (e.g., copiers, computers, printers, etc.) are found. No chlorine is found in the treated space after fumigation.
- the environment within an enclosed volume was fumigated and restored to habitability as follows. HVAC equipment is inspected and fans readied. All filters are removed and burned. Cooling and heating coils are sprayed with degreaser/detergent.
- the environment is climatized for 2.5 hours to a temperature of 60-80° F., suitably about 75° F., and a relative humidity of 70-80%, suitably about 75%.
- the pH of the city water is adjusted to 6.5-7.0 to allow the emitters to deliver free ClO 2 into the air.
- the building is sealed with strippable foam and air loss rate measure and used to correct the calculated chlorine dioxide dosage needed for fumigation.
- Chlorine dioxide is introduced with an air flow rate of 2,000 CFM and maintained at a level of 500 ppm for about 12 hours.
- the initial charge of the enclosed volume with chlorine dioxide is rapid to prevent any pathogens from reacting to the hostile environment.
- the chlorine dioxide in the enclosed air rises to 7-14 ppm a few minutes and is greater than 30 ppm within five minutes.
- Efficacy of fumigation is measured by percent inactivation of Bacillus subtilis spores that are used as monitors.
- the equipment is converted to scrubbers by rinsing chlorine dioxide and emitter with water alone followed by a mixture of bisulfite and caustic in water that absorbs ClO 2 and Cl 2
- the environmental air is detoxified for 28-32 hours or the exchange of about 30-32 building volumes, in order to reduce chlorine dioxide levels in the building air to less than about 0.1 mg/m 3 . It has been found that the chlorine dioxide levels typically decay at a rate of about 100 ppmV per hour, depending on the contents included within the volume requiring fumigation. The volume requiring fumigation can be detoxified very quickly, typically in about 5-6 hours.
- the building air is recirculated with the air conditioning on to lower the relative humidity to less than about 35%.
- the HVAC heating and cooling coils are sprayed with chlorine dioxide and the HVAC filters are replaced with new filters.
Abstract
Description
- Gas fumigation as currently practiced uses either ethylene oxide (epoxyethane, ETO), formaldehyde, vaporized peroxide or ozone. Each of these fumigants has disadvantages that limit their utility in fumigating large volumes, e.g. buildings or vehilces. Ethylene oxide is a flammable and explosive gas that is classified as both a mutagen and a carcinogen. The use of ethylene oxide as a fumigant requires extensive post detoxification and clean up procedures. Formaldehyde is potentially explosive and an occupational carcinogen. Moreover, it has poor penetrating ability. The use of formaldehyde as a fumigant requires extensive post detoxification and clean up procedures. Vaporized peroxide reacts generally with all organic compounds in the environment to be fumigated, thus having a high demand for fumigant. Vaporized peroxide is effective in fumigating spaces of volume less than 1200 ft3. Ozone reacts generally with all organic compounds in the environment to be fumigated, and has the shortest half-life of these fumigants, making ozone even less suitable than vaporized peroxide for the fumigation of large volumes.
- Chlorine dioxide is recognized as an effective sterilant. However, no guidance is available regarding the use of chlorine dioxide for the fumigation of large volumes. Sodium hypochorite is known to be useful and effective for scrubbing down surfaces. However, such procedures using sodium hypochlorite are labor intensive, affect appearance and integrity of materials scrubbed, and are not as suitable for large scale use as are the gas methods. Chlorine gas is also not suitable due to the health hazards, high corrosivity of the gas, and the production of chlorinated organic by-products.
- Chlorine dioxide, which is a selective oxidant and a protein synthesis deactivator, has been reported to be efficacious againstBacillus subtilis (a gram positive, chemoorganotroph spore former similar to Bacillus anthracis) under controlled laboratory medical sterilizer conditions.
- The present invention provides methods for the effective large-scale use of chlorine dioxide to allow for gaseous penetration of contents included within in a large enclosed volume requiring fumigation and sterilization in an environmentally safe manner. The present invention provides a method comprising the steps of:
- climatizing a volume requiring fumigation containing contents;
- generating chlorine dioxide gas;
- introducing the chlorine dioxide gas into the volume requiring fumigation;
- distributing the introduced chlorine dioxide gas in the volume requiring fumigation;
- maintaining a residual amount of the chlorine dioxide gas within the volume requiring fumigation under environmentally safe conditions at a level and duration permitting gaseous penetration of included contents as required for decontamination; and
- removing the chlorine dioxide gas from the volume requiring fumigation, thereby fumigating the large enclosed volume and contents and restoring habitability.
- In one preferred embodiment, the chlorine dioxide gas is removed from the volume requiring fumigation with the same equipment that was used to introduce the chlorine dioxide gas.
- In one embodiment, the present invention provides a process comprising producing chlorine dioxide by using an apparatus such as a chlorine dioxide generator. In one embodiment, the chlorine dioxide is generated directly as a gas. In another embodiment, the chlorine dioxide is generated as a solution of chlorine dioxide gas in a liquid. In one preferred embodiment, the liquid is water. In an aqueous solution, chlorine dioxide solution equilibrium partial pressure is optimally kept below about 26,000 ppmV.
- The generated chlorine dioxide is transferred directly, or alternatively, indirectly via a storage tank, to a high gas:liquid ratio emitter. In one preferred embodiment, the emitter is an apparatus such as a gas/liquid contactor having a high efficiency mist eliminator and very low liquid/gas rates. In one embodiment, the emitter is an apparatus such as a stripper.
- The emitter is operated to maintain the gaseous chlorine dioxide concentration substantially below the explosion limit of chlorine dioxide in the air. Prior to generation of the chlorine dioxide, the emitters are used with water alone to raise the relative humidity in the volume requiring fumigation, with adjustment of the temperature. Alternatively, the humidification and fumigation can be done simultaneously using the same apparatus by the appropriate adjustment in the temperature of chlorine dioxide solution.
- The treatment is conducted in reduced illumination, preferably substantially dark, to minimize the decomposition of chlorine dioxide to chlorine. The process is monitored with the use of an infrared camera or similar device.
- If the space to be fumigated contains materials that are potentially susceptible to corrosion, the chlorine dioxide should be of the highest possible purity. Specifically, chlorine gas should be present in the introduced gas at a level less than about 5%, preferably less than about 0.5%. Suitably chlorine dioxide gas is present at a concentration in the introduced gas of at least 90%, preferably at least 95%, and optimally at least 99%.
- Once the desired relative humidity and temperature are attained, then the variable generation rate of chlorine dioxide gas is initiated. The initial rate is high to provide sufficient chlorine dioxide to penetrate the various surfaces demands within the volume requiring fumigation. This rate is predetermined to accommodate the surface demand as well as to provide the initial charge of the volume requiring fumigation to a predetermined chlorine dioxide residual level. The chlorine dioxide generation rate is then reduced appropriately to maintain the predetermined chlorine dioxide concentration in the air of the volume requiring fumigation for a predetermined time. This can be achieved by a number of means, such as lowering the concentration of chlorine dioxide in the solution that is fed to the emitter, or lowering the flow rate of the chlorine dioxide solution to the emitter.
- The maintenance level of chlorine dioxide gas concentration is determined to compensate for the decay or loss rate from the volume requiring fumigation. The volume requiring fumigation is preferably to be at slightly negative pressure to areas outside of it and efforts are made to seal off the volume through the use of strippable sealant, such as foam that sets up hard. Once the required time weighted average concentration and contact time are attained, then the generation of chlorine dioxide is stopped.
- The generator, storage and emitter are then purged with fresh water. Once this is complete, the water is injected with an alkalizing and dechlorinating agent or other functional chemistry (e.g., ascorbic acid), that will absorb the chlorine dioxide. This scrubbing solution is then fed to the emitter and with the blowers still in operation, the emitter begins to scrub chlorine dioxide out of the environmental air composition within the said volume that has been fumigated. This process is continued until the environmental air composition within the volume that has been fumigated is returned to acceptable limits for reopening to the exterior environment and rehabitation.
- The emitters can be located inside or outside of the volume requiring fumigation. However, it is highly preferred to locate the emitter inside the volume requiring fumigation, since then no contaminated air is allowed to leave the volume requiring fumigation.
- FIG. 1 is a schematic illustration of one embodiment of the present invention.
- The present invention can be further understood by reference to FIG. 1, which schematically illustrates one embodiment of the invention. The invention is practiced using a chlorine
dioxide gas generator 100 that provides chlorine dioxide dissolved inwater 180 directly 160, or alternatively, indirectly 140 viastorage 200, to aemitter 300 comprising ablower 320 that produces chlorine dioxide gas inair 360 for treatment of building areas and/or a heating, ventilation and air conditioning (HVAC) return air system of abuilding 400. - The
chlorine dioxide generator 100 receives aninput 150 that is a mixture ofcity makeup water 140 andchemicals city makeup water 140 andchemicals city makeup water 140 andchemicals input 150 of thechlorine dioxide generator 100, in order to adjust the relative humidity of the volume to be treated. In the second stage of the process, chlorinedioxide precursor chemicals 120 are combined with thecity makeup water 140. Several chemical means of generating chlorine dioxide, and their corresponding chlorine dioxide precursor chemicals are known in the art, and the choice of suitable means and chemicals is within the abilities of the skilled artisan. Exemplary chemical means of generating chlorine dioxide are disclosed in U.S. Pat. Nos. 4,689,169 (Mason et al.), 5,204,081 (Mason et al.), 5,227,306 (Eltomi et al.), 5,258,171 (Eltomi et al.) and 5,965,004 (Cowley et al.), the teachings of which are hereby incorporated by reference. - The output of the
chlorine dioxide generator 100 can be routed directly 160 to provide chlorine dioxide dissolved inwater 180 to theemitter 300. Alternatively, the output of the chlorine dioxide generator can be routed 140 to a storage means 200, from which chlorine dioxide dissolved inwater 180 can be routed to theemitter 300. - The
emitter 300 removes chlorine dioxide from the water and delivers chlorine dioxide inair 360 by duct means to the volume to be fumigated, in general, building areas and/or a HVAC return air system. “Duct means” includes, but is not limited to, temporary or permanent ductwork, pipes, hoses and the like.Water 380 recovered from the emitter can be recycled and combined by mixing means withcity makeup water 140 andchemicals input 150 to thechlorine dioxide generator 100. - In a third stage of the process, the
chlorine dioxide generator 100,storage 200 andemitter 300 are flushed with water alone. During a further stage of the process,detoxification chemicals 130 are combined with water to provide the input to thechlorine dioxide generator 100. - Monitoring and controlling the dew point within the volume requiring fumigation is a significant aspect. During the process of fumigation, steps must be taken to avoid condensation. Therefore during the entire fumigation process the atmosphere within the volume requiring fumigation must be carefully controlled using space heaters or the HVAC system both to avoid over-humidification and to regulate the temperature of the chlorine dioxide solution fed to the emitter. Failure to control these factors can lead to spot damage as well as a higher use to chlorine dioxide.
- The environment within the enclosed volume of a trailer is fumigated and restored to habitability as follows. Initially, the environment is climatized to a temperature of 70-80° F. and a relative humidity of 60-80%. During treatment, chlorine dioxide is introduced into the volume to be fumigated and maintained at a residual level of 500 ppm V for 10 hours. In other embodiments, the residual chlorine dioxide level is maintained at about 750 ppm V, about 1000 ppm V or about 3000 ppm V and the treatment time is in the range of about 8 to about 12 hours. Typically, if the enclosed volume is 2280 ft3, air is suitably recirculated at 5 CFM. The treatment is conducted in reduced illumination, preferably substantially dark, to minimize the decomposition of chlorine dioxide to chlorine. Suitably chlorine dioxide gas is present at a concentration in the introduced gas of at least 90%, preferably at least 95%, and optimally at least 99%.
- If the space to be fumigated contains materials that are potentially susceptible to corrosion, the chlorine dioxide should be of the highest possible purity. Specifically, chlorine gas should be present in the introduced gas at a level less than about 5%, preferably less than about 0.5% Efficacy is measured by percent inactivation ofBacillus subtilis spores used as monitors. The contents of the trailer are inspected to determine the discoloration and functionality of all the material placed in trailer, including drapes, chairs, files, mail and other documents and computers. Apart from a slight discoloration, no discernible effects on carpets, drapes, furniture and office equipment (e.g., copiers, computers, printers, etc.) are found. No chlorine is found in the treated space after fumigation.
- The environment within an enclosed volume was fumigated and restored to habitability as follows. HVAC equipment is inspected and fans readied. All filters are removed and burned. Cooling and heating coils are sprayed with degreaser/detergent. The environment is climatized for 2.5 hours to a temperature of 60-80° F., suitably about 75° F., and a relative humidity of 70-80%, suitably about 75%. The pH of the city water is adjusted to 6.5-7.0 to allow the emitters to deliver free ClO2 into the air. The building is sealed with strippable foam and air loss rate measure and used to correct the calculated chlorine dioxide dosage needed for fumigation.
- Additional internal fans are placed in positions determined by modeling to assist the HVAC in approaching ideal mixing. Chlorine dioxide is introduced with an air flow rate of 2,000 CFM and maintained at a level of 500 ppm for about 12 hours. The initial charge of the enclosed volume with chlorine dioxide is rapid to prevent any pathogens from reacting to the hostile environment. Typically the chlorine dioxide in the enclosed air rises to 7-14 ppm a few minutes and is greater than 30 ppm within five minutes. Efficacy of fumigation is measured by percent inactivation ofBacillus subtilis spores that are used as monitors.
- The equipment is converted to scrubbers by rinsing chlorine dioxide and emitter with water alone followed by a mixture of bisulfite and caustic in water that absorbs ClO2 and Cl2 The environmental air is detoxified for 28-32 hours or the exchange of about 30-32 building volumes, in order to reduce chlorine dioxide levels in the building air to less than about 0.1 mg/m3. It has been found that the chlorine dioxide levels typically decay at a rate of about 100 ppmV per hour, depending on the contents included within the volume requiring fumigation. The volume requiring fumigation can be detoxified very quickly, typically in about 5-6 hours.
- The building air is recirculated with the air conditioning on to lower the relative humidity to less than about 35%. The HVAC heating and cooling coils are sprayed with chlorine dioxide and the HVAC filters are replaced with new filters.
- The present invention is not to be limited in scope by the specific embodiments described herein, but by the appended claims. The described embodiments are intended as illustrations of individual aspects of the invention, and functionally equivalent methods and components are within the scope of the invention. Indeed, various modifications of the invention, in addition to those shown and described herein will become apparent to those skilled in the art from the foregoing description and accompanying drawing. Such modifications are intended to fall within the scope of the appended claims.
Claims (18)
Priority Applications (7)
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US09/997,694 US20030143111A1 (en) | 2001-11-30 | 2001-11-30 | Methods of using chlorine dioxide as a fumigant |
PCT/US2002/037906 WO2003047640A1 (en) | 2001-11-30 | 2002-11-27 | Methods of using chlorine dioxide as a fumigant |
EP02804451A EP1448239A4 (en) | 2001-11-30 | 2002-11-27 | Methods of using chlorine dioxide as a fumigant |
AU2002365884A AU2002365884A1 (en) | 2001-11-30 | 2002-11-27 | Methods of using chlorine dioxide as a fumigant |
JP2003548894A JP2005528930A (en) | 2001-11-30 | 2002-11-27 | How to use chlorine dioxide as a fumigant |
CA002468671A CA2468671A1 (en) | 2001-11-30 | 2002-11-27 | Methods of using chlorine dioxide as a fumigant |
US11/270,973 US7807101B2 (en) | 2001-11-30 | 2005-11-11 | Methods of using chlorine dioxide as a fumigant |
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US09/997,694 US20030143111A1 (en) | 2001-11-30 | 2001-11-30 | Methods of using chlorine dioxide as a fumigant |
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US11/270,973 Expired - Fee Related US7807101B2 (en) | 2001-11-30 | 2005-11-11 | Methods of using chlorine dioxide as a fumigant |
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JP (1) | JP2005528930A (en) |
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US20090169424A1 (en) * | 2008-01-02 | 2009-07-02 | Richard Michael Franchi | Method of disinfecting and wetiing the interior of a building |
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JP2010207539A (en) * | 2009-03-12 | 2010-09-24 | Takasago Thermal Eng Co Ltd | Indoor processing method and processing apparatus |
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US10434208B1 (en) | 2018-05-09 | 2019-10-08 | Zuna Inc. | Integrated disinfection system |
Citations (11)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4272019A (en) * | 1978-10-17 | 1981-06-09 | Halaby Jr Samuel A | Fluid sprayer apparatus and method |
US4681739A (en) * | 1982-10-19 | 1987-07-21 | The Scopas Technology Co., Inc. | Use of chlorine dioxide gas as a chemosterilizing agent |
US4780333A (en) * | 1986-12-29 | 1988-10-25 | Ford Motor Company | Method for treatment of air conditioning system |
US5565180A (en) * | 1987-03-02 | 1996-10-15 | Turbotak Inc. | Method of treating gases |
US6077495A (en) * | 1997-03-03 | 2000-06-20 | Engelhard Corporation | Method, composition and system for the controlled release of chlorine dioxide gas |
US20020125196A1 (en) * | 2001-03-08 | 2002-09-12 | Cdg Technology, Inc. | Methods of treating water using combinations of chlorine dioxide, chlorine and ammonia |
US6537821B1 (en) * | 2000-06-08 | 2003-03-25 | Cdg Technology Inc. | Method and apparatus for detecting, measuring, and/or removing chlorine gas contamination in gaseous chlorine dioxide |
US20030138371A1 (en) * | 2002-01-18 | 2003-07-24 | Cdg Technology, Inc. | Method and apparatus for generating gaseous chlorine dioxide-chlorine mixtures |
US20040259188A1 (en) * | 2001-11-05 | 2004-12-23 | Rosenblatt Aaron A. | Method and system for processing bio-contaminated articles |
US20050019210A1 (en) * | 2001-11-05 | 2005-01-27 | Rosenblatt Aron A | Parametric decontamination of bio-contaminated facities using chlorine dioxide gas |
US20050031467A1 (en) * | 2003-08-07 | 2005-02-10 | Caldwell Denise M. | Fluid driven pump with improved exhaust port arrangement |
Family Cites Families (12)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4908188A (en) * | 1985-02-05 | 1990-03-13 | The Scopas Technology Company, Inc. | Gas sterilant system |
JPS6434904A (en) * | 1987-07-30 | 1989-02-06 | Japan Carlit Co Ltd | Composition for generating chlorine dioxide gas |
US5006326A (en) * | 1989-05-02 | 1991-04-09 | International Dioxcide, Inc. | Gaseous generator system for preparing chlorine dioxide |
US5110580A (en) * | 1989-09-14 | 1992-05-05 | Iolab Corporation | Method and apparatus for chlorine dioxide manufacture |
US5713137A (en) * | 1995-05-17 | 1998-02-03 | Fujita; Sanai | Apparatus for deodorizing, sterilizing and drying bedding and clothing |
JPH09220274A (en) * | 1996-02-16 | 1997-08-26 | Sanai Fujita | Gas supplying device for sterilizing, deodorizing and drying |
US5961936A (en) | 1996-12-12 | 1999-10-05 | Johnson & Johnson | Arrangement for adapting a gas generation and recovery system to a target volume |
US6235240B1 (en) * | 1996-12-12 | 2001-05-22 | Johnson & Johnson | Gas recovery system |
JP3815015B2 (en) * | 1997-12-11 | 2006-08-30 | チッソ株式会社 | Fumigation equipment using chlorine dioxide gas |
JP2001314492A (en) * | 2000-05-02 | 2001-11-13 | San Seal:Kk | Air conditioner provided with deodorizing and sterilizing gas supplying means |
JP2002272827A (en) * | 2001-03-14 | 2002-09-24 | San Seal:Kk | Infection prevention system for treatment room, dissecting room and the like |
US20040022667A1 (en) * | 2001-11-07 | 2004-02-05 | Sunggyu Lee | Microbial decontamination and detoxification system and method |
-
2001
- 2001-11-30 US US09/997,694 patent/US20030143111A1/en not_active Abandoned
-
2002
- 2002-11-27 AU AU2002365884A patent/AU2002365884A1/en not_active Abandoned
- 2002-11-27 WO PCT/US2002/037906 patent/WO2003047640A1/en not_active Application Discontinuation
- 2002-11-27 EP EP02804451A patent/EP1448239A4/en not_active Withdrawn
- 2002-11-27 JP JP2003548894A patent/JP2005528930A/en active Pending
- 2002-11-27 CA CA002468671A patent/CA2468671A1/en not_active Abandoned
-
2005
- 2005-11-11 US US11/270,973 patent/US7807101B2/en not_active Expired - Fee Related
Patent Citations (13)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4272019A (en) * | 1978-10-17 | 1981-06-09 | Halaby Jr Samuel A | Fluid sprayer apparatus and method |
US4681739A (en) * | 1982-10-19 | 1987-07-21 | The Scopas Technology Co., Inc. | Use of chlorine dioxide gas as a chemosterilizing agent |
US4780333A (en) * | 1986-12-29 | 1988-10-25 | Ford Motor Company | Method for treatment of air conditioning system |
US5565180A (en) * | 1987-03-02 | 1996-10-15 | Turbotak Inc. | Method of treating gases |
US20020036284A1 (en) * | 1997-03-03 | 2002-03-28 | Engelhard Corporation | Method, composition and system for the controlled release of chlorine dioxide gas |
US20010036421A1 (en) * | 1997-03-03 | 2001-11-01 | Engelhard Corporation | Method and system for the controlled release of chlorine dioxide gas |
US6077495A (en) * | 1997-03-03 | 2000-06-20 | Engelhard Corporation | Method, composition and system for the controlled release of chlorine dioxide gas |
US6537821B1 (en) * | 2000-06-08 | 2003-03-25 | Cdg Technology Inc. | Method and apparatus for detecting, measuring, and/or removing chlorine gas contamination in gaseous chlorine dioxide |
US20020125196A1 (en) * | 2001-03-08 | 2002-09-12 | Cdg Technology, Inc. | Methods of treating water using combinations of chlorine dioxide, chlorine and ammonia |
US20040259188A1 (en) * | 2001-11-05 | 2004-12-23 | Rosenblatt Aaron A. | Method and system for processing bio-contaminated articles |
US20050019210A1 (en) * | 2001-11-05 | 2005-01-27 | Rosenblatt Aron A | Parametric decontamination of bio-contaminated facities using chlorine dioxide gas |
US20030138371A1 (en) * | 2002-01-18 | 2003-07-24 | Cdg Technology, Inc. | Method and apparatus for generating gaseous chlorine dioxide-chlorine mixtures |
US20050031467A1 (en) * | 2003-08-07 | 2005-02-10 | Caldwell Denise M. | Fluid driven pump with improved exhaust port arrangement |
Cited By (17)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20050019210A1 (en) * | 2001-11-05 | 2005-01-27 | Rosenblatt Aron A | Parametric decontamination of bio-contaminated facities using chlorine dioxide gas |
US7144551B2 (en) * | 2002-04-05 | 2006-12-05 | Dh Technologies, L.L.P. | Mold remediation system and method |
US20070212256A1 (en) * | 2002-04-05 | 2007-09-13 | Helton Danny O | Mold remediation system and method |
US20040001777A1 (en) * | 2002-04-05 | 2004-01-01 | Hobson David W. | Mold remediation system and method |
US7459700B2 (en) | 2002-04-24 | 2008-12-02 | United States Postal Service | Anthrax remediation and response |
US20040009094A1 (en) * | 2002-05-02 | 2004-01-15 | Adiga Kayyani C. | Method for bioeradication using fine mist of biocide solutions |
US7264773B2 (en) * | 2002-05-02 | 2007-09-04 | Nanomist Systems, Llc | Method for bioeradication using fine mist of biocide solutions |
US20040211923A1 (en) * | 2003-04-24 | 2004-10-28 | Bridges John H. | Anthrax remediation and response |
US20050079123A1 (en) * | 2003-10-10 | 2005-04-14 | Shuler Robert K. | Method and apparatus for microbial decontamination |
US20070231220A1 (en) * | 2005-02-22 | 2007-10-04 | Agius George J | Method and apparatus for producing and dispensing a cleaning solution |
US20080025874A1 (en) * | 2006-07-27 | 2008-01-31 | Coughlin Michael F | Method and apparatus for measuring and/or controlling the concentration of a gas in a solution |
US20080025870A1 (en) * | 2006-07-27 | 2008-01-31 | Groenewegen Cornelis H | Method and apparatus for treating items |
US20090169424A1 (en) * | 2008-01-02 | 2009-07-02 | Richard Michael Franchi | Method of disinfecting and wetiing the interior of a building |
US7988910B2 (en) * | 2008-01-02 | 2011-08-02 | Richard Michael Franchi | Method of disinfecting and wetting the interior of a building |
WO2010127032A2 (en) * | 2009-04-29 | 2010-11-04 | Sabre Intellectual Property Holdings Company Llc | Remediation of gypsum board using gaseous chlorine dioxide |
WO2010127032A3 (en) * | 2009-04-29 | 2011-03-03 | Sabre Intellectual Property Holdings Llc | Remediation of gypsum board using gaseous chlorine dioxide |
WO2017204747A1 (en) * | 2016-05-23 | 2017-11-30 | Mitrol Biologic Pte. Ltd. | System and method of cleaning an environment |
Also Published As
Publication number | Publication date |
---|---|
EP1448239A1 (en) | 2004-08-25 |
US7807101B2 (en) | 2010-10-05 |
US20060228253A1 (en) | 2006-10-12 |
AU2002365884A1 (en) | 2003-06-17 |
WO2003047640A1 (en) | 2003-06-12 |
CA2468671A1 (en) | 2003-06-12 |
JP2005528930A (en) | 2005-09-29 |
EP1448239A4 (en) | 2005-04-13 |
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