WO2020089763A1 - Procédé et système de nettoyage et de désinfection - Google Patents

Procédé et système de nettoyage et de désinfection Download PDF

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Publication number
WO2020089763A1
WO2020089763A1 PCT/IB2019/059208 IB2019059208W WO2020089763A1 WO 2020089763 A1 WO2020089763 A1 WO 2020089763A1 IB 2019059208 W IB2019059208 W IB 2019059208W WO 2020089763 A1 WO2020089763 A1 WO 2020089763A1
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Prior art keywords
air
ozone
hydroxyl radicals
space
generator
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PCT/IB2019/059208
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English (en)
Inventor
Arvydas STONCIUS
Original Assignee
Uab "Airplus1 Lituanica"
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Publication date
Application filed by Uab "Airplus1 Lituanica" filed Critical Uab "Airplus1 Lituanica"
Priority to EP19824383.4A priority Critical patent/EP3787698A1/fr
Priority to EA202092690A priority patent/EA202092690A1/ru
Publication of WO2020089763A1 publication Critical patent/WO2020089763A1/fr

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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
    • 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
    • A61L9/04—Disinfection, sterilisation or deodorisation of air using gaseous or vaporous substances, e.g. ozone using substances evaporated in the air without heating
    • 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
    • A61L9/04—Disinfection, sterilisation or deodorisation of air using gaseous or vaporous substances, e.g. ozone using substances evaporated in the air without heating
    • A61L9/046—Disinfection, sterilisation or deodorisation of air using gaseous or vaporous substances, e.g. ozone using substances evaporated in the air without heating with the help of a non-organic compound
    • 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
    • A61L9/04—Disinfection, sterilisation or deodorisation of air using gaseous or vaporous substances, e.g. ozone using substances evaporated in the air without heating
    • A61L9/12—Apparatus, e.g. holders, therefor
    • 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
    • A61L9/04—Disinfection, sterilisation or deodorisation of air using gaseous or vaporous substances, e.g. ozone using substances evaporated in the air without heating
    • A61L9/12—Apparatus, e.g. holders, therefor
    • A61L9/122—Apparatus, e.g. holders, therefor comprising a fan
    • 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
    • A61L9/16—Disinfection, sterilisation or deodorisation of air using physical phenomena
    • A61L9/18—Radiation
    • A61L9/20—Ultraviolet radiation
    • 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
    • B01D53/34—Chemical or biological purification of waste gases
    • B01D53/46—Removing components of defined structure
    • B01D53/48—Sulfur compounds
    • B01D53/50—Sulfur oxides
    • 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
    • B01D53/34—Chemical or biological purification of waste gases
    • B01D53/46—Removing components of defined structure
    • B01D53/48—Sulfur compounds
    • B01D53/52—Hydrogen sulfide
    • 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
    • B01D53/34—Chemical or biological purification of waste gases
    • B01D53/46—Removing components of defined structure
    • B01D53/54—Nitrogen compounds
    • B01D53/58—Ammonia
    • 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
    • B01D53/34—Chemical or biological purification of waste gases
    • B01D53/46—Removing components of defined structure
    • B01D53/72—Organic compounds not provided for in groups B01D53/48 - B01D53/70, e.g. hydrocarbons
    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
    • C01B13/00—Oxygen; Ozone; Oxides or hydroxides in general
    • C01B13/10—Preparation of ozone
    • C01B13/11—Preparation of ozone by electric discharge
    • 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
    • A61L2209/00—Aspects relating to disinfection, sterilisation or deodorisation of air
    • A61L2209/20—Method-related aspects
    • A61L2209/21—Use of chemical compounds for treating air or the like
    • A61L2209/212—Use of ozone, e.g. generated by UV radiation or electrical discharge
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2251/00—Reactants
    • B01D2251/10—Oxidants
    • B01D2251/104—Ozone
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2257/00—Components to be removed
    • B01D2257/91—Bacteria; Microorganisms
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2258/00—Sources of waste gases
    • B01D2258/06—Polluted air
    • 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
    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
    • C01B2201/00—Preparation of ozone by electrical discharge
    • C01B2201/60—Feed streams for electrical dischargers
    • C01B2201/62—Air
    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
    • C01B2201/00—Preparation of ozone by electrical discharge
    • C01B2201/90—Control of the process

Definitions

  • Present invention relates to the field of disinfection of various media and in particular to a method and system for disinfection using ozone and hydroxyl radicals. Background of the invention
  • Objects such as sewage pumping stations and wastewater treatment plants are sources of bad odours and various factors that are harmful to humans.
  • Wastewater pumping stations, industrial and municipal wastewater and contents thereof in wastewater treatment plants become growth media (especially at higher temperatures) of microorganisms such as bacteria, protozoa, mould, which in turn produce organic pollutants.
  • Inorganic pollutants such as hydrogen sulphide and ammonia also appear.
  • Another source of bad odour and contamination is municipal waste storage facilities where large quantities of waste such as non-food, inorganic, food and other organic waste, are stored. Some of such waste and its contents become mouldy and become breeding grounds for pests (rodents, insects) and incubation media for microorganisms (bacteria, protozoa, fungi and moulds).
  • ozone gas and hydroxyl radicals are used to disinfect various media, in particular air, and deodorizing.
  • ozone is produced by exposure of oxygen or air to ultraviolet radiation or corona discharge.
  • hydroxyl radicals occurs through chemical interaction of ozone with water or air humidity.
  • the lifetime of a hydroxyl radical is thousands of times shorter than that of ozone, up to 1 second, whereas its activity in response to contaminants and pathogens is much higher than that of ozone.
  • Hydroxyl radicals in water or in aqueous solutions may be obtained by Fenton reaction, electrochemicaily by using a boron-diamond or other electrode, by cavitation using mechanical energy for production of hydroxyl radicals and by using other methods.
  • Much less common are methods that allow the generation of hydroxyl radicals in gaseous phase, like in the air, or at least in aerosols: photochemical - generation of hydroxyl radicals by exposure of air humidity to UV light (or even sunlight) and photo catalysts such as titanium dioxide (T1O2).
  • International Application No. PCT/US2010/029095 discloses a system and method for disinfection using ozone gas and hydroxyl radicals.
  • the system comprises an ozone generator and a humidifier.
  • the humidifier uses a solution of hydrogen peroxide in water. It is established that higher the humidity the better the ozone disinfects the environment. Desired percentage of humidity of the environment to be disinfected is indicated.
  • Main disadvantages of the system and the method are that the entire room to be disinfected is being humidified requiring high energy consumption, also purchase, storage and use of aggressive hydrogen peroxide.
  • Another disadvantage is that time needed to reach the required humidity level and exposure of the walls of the room and other objects to higher levels of humidity takes a considerable amount of time which can cause adverse effects on said objects.
  • air mixture is supplied from premises to be disinfected where the gas mixture is generally not suitable for efficient ozone generation.
  • the invention overcomes the drawbacks associated with air disinfection which are typical for conventional ozone-based disinfection systems using ozone and hydroxyl radicals for disinfection of materials of various states.
  • the method comprises supplying air with high humidity content, supplying ozone and hydroxyl radicals generated in the environment having high humidity content in the vicinity of the place to be disinfected.
  • system for disinfecting and cleaning various media and in particular air and solid surfaces comprises an air supply fan, a supply air filter, at least one ozone and hydroxyl radical generator, at least one air humidifier, ducts, an air extraction fan, a programmable control unit, an ozone sensors, a final purification reactor including extraction air filter, UV source and catalyst.
  • Fig. 1 depicts an exemplary embodiment of the system where ozone and hydroxyl radicals are fed into space containing source of contamination and air humidifier is located upstream of ozone and hydroxyl radicals generator.
  • Fig. 2 depicts an exemplary embodiment of the system where ozone and hydroxyl radicals are fed into a space through which the air from the space containing source of contamination is being extracted and air humidifier is located upstream of ozone and hydroxyl radicals generator.
  • Fig. 3 depicts an exemplary embodiment of the system where ozone and hydroxyl radicals are fed into a space containing source of contamination and into space through which air from the space containing the source of contamination is being extracted and air humidifier is located upstream of ozone and hydroxyl radicals generator.
  • Fig. 4 depicts an exemplary embodiment of the system where ozone and hydroxyl radicals are fed into a space containing a source of contamination and air humidifier is located downstream of ozone and hydroxyl radicals generator.
  • Fig. 5 depicts an exemplary embodiment of the system where ozone and hydroxyl radicals are fed into a space through which air from the space containing a source of contamination is being extracted and air humidifier is located downstream of ozone and hydroxyl radicals generator.
  • Fig. 6 depicts an exemplary embodiment of the system where ozone and hydroxyl radicals are fed into a space containing a source of contamination and into space through which the air from the space containing a source of contamination is being extracted and air humidifier is located downstream of ozone and hydroxyl radicals generator.
  • Cleaning and disinfection system comprises an air intake fan (2), an air-intake filter (3), at least one air humidifier (4, 4'), at least one ozone and hydroxyl radical generator (5, 5'), a final purification reactor (6) comprising an air extraction fan (7), the extracted air filter (8), a UV source (9), a catalyst (10) as well as an ozone concentration sensor (1 1 ').
  • the system also comprises at least one further ozone concentration sensor (1 1 ), ducts (12, 12', 12") and a programmable control unit (13).
  • the air intake fan (2) is an in-duct fan that produces pressure, for example of at least 500 Pa, and is of such a capacity that air velocity through each of the at least one ozone and hydroxyl radicals generators (5, 5') is for example at least 2 - 4 m / s.
  • the air-intake filter (3) is a common air filter, used in ventilation systems, e.g. class M5 filter.
  • the filter (3) is used to purify the gas mixture that is supplied to produce the ozone and hydroxyl radicals.
  • the air humidifier (4, 4') is preferably an ultrasonic humidifier, but it can also be based on air flow filtration through a wet filter, a humidifier providing a warm or cold drizzle.
  • the air humidifier (4, 4') comprises a water supply system for humidifiers with water softener filters and other necessary accessories.
  • the final purification reactor (6) comprises a housing made of, for example stainless steel, or other material, depending on the environmental conditions.
  • the reactor (6) is equipped with an extraction air filter (8), a UV source (9) and/or a catalyst (10), an ozone sensor (1 1 ') and other equipment.
  • the casing of final purification reactor (6) is further equipped with a sealed door (not shown in the drawing) for inspection and servicing of equipment contained therein.
  • the reactor (6) has a larger cross-sectional area than the cross-sectional area of the intake air duct. In this way the air flow rate in the reactor (6) itself is reduced.
  • the air extraction fan (7) is mounted at the air inlet or outlet end of the reactor (6) housing.
  • the air extraction fan (7) is, for example, a centrifugal fan and has an increased chemical resistance suitable for operation in potentially explosive environment.
  • the exhaust air filter (8) is a common filter used in coarse filtration ventilation systems, such as, for example G3 or G4 class filter.
  • the filter (8) is used to purify the gas mixture discharged from the environment to be disinfected into the unit for accelerated ozone decomposition, the final purification reactor (6).
  • the UV source (9) comprises, for example, UV lamps, such as 254 nm wavelength low pressure amalgam UV lamps.
  • the lamps are arranged so that the UV radiation is directed in the direction of air flow movement in the final-purification reactor (6).
  • the catalyst (10) comprises a large surface inert carrier such as activated carbon or basic alumina.
  • the carrier may be granules having an average size of 3 mm and being impregnated or otherwise treated with substances such as potassium or sodium hydroxide (caustic potash or caustic soda), potassium or sodium silicate, or potassium or sodium carbonate, or copper (II) or manganese (II) nitrate.
  • the programmable control unit (13) comprises (not detailed in the drawings) a microprocessor, a power supply unit, relays, contact units, an automatic circuit breakers and a wireless modem.
  • the programmable control unit (13) controls the electrical power supplied to the ozone and hydroxyl radicals generators (5, 5') according to readings of the ozone concentration sensors (1 1 , 1 1 ').
  • At least one ozone concentration sensor (1 1 ) is installed in a space to be disinfected or in a space containing the disinfection equipment and significantly away from the ozone supply pipe for the area to be disinfected.
  • At least one other ozone concentration sensor (1 V) is installed at the air outlet end of the system, downstream of the catalyst (10). In this way ozone concentration levels are monitored both inside and outside of the environment being disinfected.
  • Ozone concentration sensors (1 1 , 11 ') can comprise electrochemical ozone sensitive sensors or airborne ozone level monitors operating on the principle of UV absorption.
  • air pollutants are adsorbed - concentrated on a surface of the catalyst (9), at peak times and / or at predetermined time instances, thereby removing them from the passing air flow.
  • the excess ozone reaches the catalyst (9) which decomposes on the surface of the catalyst (9) into atomic oxygen, a strong oxidant that oxidizes pollutants adsorbed on the surface of the catalyst (9) thus cleaning the surface of the catalyst.
  • the alkaline surface of the catalyst (9) adsorbs acidic oxidation products of pollutants such as sulphur oxides resulting in formation of sulphites/sulphates.
  • UV light decomposes ozone converting it into atomic and then molecular oxygen.
  • the atomic oxygen due to its higher activity oxidizes residues of air pollutants.
  • substantially fresh air leaves the reactor (6).
  • the duct (12') connecting the ozone and hydroxyl radical generator (5, 5') to the site to be disinfected is no longer than the distance travelled by air flow through the ozone and hydroxyl radical generator (5, 5') in 1 second.
  • the length of the duct (12") from the point where the mixture of air, ozone and hydroxyl radicals is introduced to the final air purification reactor (6) is not less than the distance travelled by the air flow in 8 seconds.
  • the air intake fan (2) draws in ambient air to supply to each ozone and hydroxyl radical generators (5, 5').
  • the air inlet side of the intake fan (2) faces a space separated from the space to be disinfected and protrudes therein.
  • the intake air is passed through an air filter (3) which is tightly attached downstream of the intake fan (2).
  • Air intake and extraction fans (2, 7) are used to ensure air circulation in the disinfection system, i.e. for sufficient supply of air to the ozone and hydroxyl radical generators (5, 5') and for removal of cleaned air from the enclosed disinfection environment, including ozone that is decomposed in controlled manner.
  • Figure 1 shows an embodiment of the cleaning and disinfection system comprising an air intake fan (2), an intake air filter (3), an air humidifier (4), a corona discharge-based ozone and hydroxyl radical generator (5), and a final purification reactor (6) comprising an air extraction fan (7), an extraction air filter (8), a UV source (9), a catalyst (10) and an ozone concentration sensor (1 1 ').
  • the system also comprises a further ozone concentration sensor (1 1 ), ducts (12, 12', 12") and a programmable control unit (13).
  • the air humidifier (4) is mounted downstream of the intake air filter (3).
  • the air moves from the air humidifier (4) to the ozone and hydroxyl radical generator (5) through the duct that is made of a corrosion-resistant material or has an inner surface covered with such material.
  • hydroxyl radicals are extremely reactive particles, they can even cause corrosion of inert metals especially when exposed to extensive moisture.
  • the air being passed through the ozone and hydroxyl radical generator (5) should not contact materials that are not resistant to corrosion.
  • the ozone and hydroxyl radical generator (5) comprises ozone-generating cells (not shown in the drawings) made of double dielectric material such as glass, quartz, polytetrafluoroethylene or ceramics.
  • the air with controllably increased humidity enters the ozone and hydroxyl radical generator (5) and passes through said cells.
  • the generator (5) is supplied with high-voltage transformers and other electronics (not shown in the drawings) arranged outside of the ozone-generation area. Such design of the generator (5) and the system allows the use of wet, moist air for ionization, i.e. for the production of ozone and hydroxyl radicals.
  • ozone yield decreases sharply with increasing humidity. Even at a relative humidity of about 30% the production of ozone drops by about 40%. And when relative humidity is above 70%, ozone production decreases to only about 30% of usual capacity, where“usual” means nominal production capacity in case of dry air. This occurs not only because the formed ozone partially reacts with the air humidity to form hydroxyl radicals and similar oxygen oxidants but also because the oxygen that is ionized and decomposed by corona discharge becomes atomic oxygen / oxygen radical which reacts with moisture - water vapour and aerosols to form hydroxyl radicals.
  • corona discharge generators (5) that are optimized for operation with humid air produce relatively little amounts of ozone, but much more hydroxyl radicals greatly exceeding oxidizing properties of the ozone (oxidation-reduction potential: 2.07 V for ozone, 2.42 V for atomic oxygen, 2.86 V for hydroxyl radical, and, for example, 2.87 V for fluorine).
  • the control unit (13) controls operation of the humidifier according to the humidity sensor (not shown in the drawing) in the ozone and hydroxyl radical generator (5) so that the relative humidity of the air passing through the ozone and hydroxyl radical generator (5) is not lower than certain predetermined value, for example, 60%. It also adjusts operation of the controlled devices according to the temperature sensor installed in the ozone and hydroxyl radical generator (5). This ensures only a small excess of oxidants as well as operational safety and cost-effectiveness of the system.
  • the duct (12) for supplying air to the ozone and hydroxyl radical generator (5), the duct (12') for supplying ozone and hydroxyl radicals to the space (14) intended for disinfection, the duct (12") for extracting air from the disinfected space (14) and the housing of the ozone and hydroxyl radical generator (5) are made of corrosion-resistant material such as stainless steel AISI 316L, polytetrafluoroethylene, glass, ceramics, etc.
  • the air inlet end of the air supply fan (2) is directed towards the space from which the space (14) to be disinfected is separated, i.e. the space to be disinfected is enclosed.
  • the duct (12') connecting the ozone and hydroxyl radical generator (5) to the space (14) to be disinfected does not exceed the distance travelled by an air flow through the ozone and hydroxyl radical generator (5) in 1 second.
  • the length of the duct (12") from the point where the mixture of air, ozone and hydroxyl radicals is introduced to the final air purification reactor (6) is not less than the path travelled by the air flow in 8 seconds.
  • Air intake fan (2) operates as described above.
  • Air intake filter (3) operates as described above.
  • the air humidifier (4) is preferably an ultrasonic humidifier.
  • the air humidifier (4) comprises a water supply system for humidifiers with water hardness removal filters, and other necessary accessories.
  • the air extraction fan (7) is mounted at the air inlet or outlet end of the reactor (6) housing is made as described above.
  • the exhaust air filter (8) and operation thereof is as described above.
  • the UV source (9) and operation thereof is as described above.
  • the catalyst (10) and operation thereof is as described above.
  • the programmable control unit (13) and operation thereof is as described above.
  • the ozone concentration sensors (1 1 , 1 T) and operation thereof are as described above.
  • the space (14) to be disinfected may be separated from the disinfection system units to which the ozone and hydroxyl radicals are delivered through the duct (12') and the air would be extracted from such a space through the extraction duct (12").
  • ozone and hydroxyl radicals are introduced into a duct (12") for extracting air from a closed environment containing an air pollution source (16).
  • the ozone and hydroxyl radicals from at least two ozone and hydroxyl radical generators (5), through ducts (12'), are fed to spaces (14) to be disinfected, one of which is a space containing an air pollution source (16), and another is a space delimited by the duct (12") for air extraction from the first space.
  • Figure 4 depicts a cleaning and disinfection system comprising an air intake fan (2), an intake air filter (3), an air humidifier (4’), ozone and hydroxyl radical generator (5’), a final purification reactor (6) comprising an air extraction fan (7), an extraction air filter (8), a UV source (9), a catalyst (10) and an ozone sensor (1 1 ').
  • the system also comprises at least one other ozone sensor (1 1 ), ducts (12, 12', 12") and a programmable control unit (13).
  • the air humidifier (4') is mounted downstream of the ozone and hydroxyl radical generator (5').
  • the air humidifier (4’) is preferably an ultrasonic humidifier.
  • the air humidifier (4') operates continuously together with the ozone generator (5’), regardless of the initial humidity of the air supplied to the equipment.
  • Ozone is introduced in the immediate vicinity of the ultrasonic transmitter, where increased humidity is generated, in the form of fine droplets.
  • the ozone generator (5') upstream of the air humidifier is a corona discharge ozone generator designed to work with dry air or oxygen.
  • the generator (5’) is supplied with high-voltage transformers and other electronics (not shown in the drawings).
  • the duct (12) for supplying air to the ozone and hydroxyl radical generator (5') may be made of a material other than corrosion resistant material, differently from the duct (12') for supplying ozone and hydroxyl radicals to the space (14) to be disinfected and the duct (12") for extracting air from the space (14) to be disinfected (the latter both are made of corrosion-resistant materials, such as stainless steel AISI 316L, polytetrafluoroethylene, glass, ceramics, etc.).
  • the air inlet end of the air supply fan (2) is directed towards the space from which the space (14) to be disinfected is separated, i.e. the space to be disinfected is enclosed.
  • the duct (12') connecting the ozone and hydroxyl radical generator (5’) to the space (14) to be disinfected is no longer than the distance travelled by an air flow through the ozone and hydroxyl radical generator (5') in 1 second.
  • the length of the duct (12") from the point where the mixture of air, ozone and hydroxyl radicals is introduced to the final air purification reactor (6) is not less than the path travelled by the air flow in 8 seconds.
  • Air intake fan (2) operates as described above.
  • Air intake filter (3) operates as described above.
  • the air humidifier (4’) is preferably an ultrasonic humidifier.
  • the air humidifier (4’) comprises a water supply system for humidifiers with water hardness removal filters, and other necessary accessories.
  • the operation of final purification reactor (6) is as described above.
  • the air extraction fan (7) is mounted at the air inlet or outlet end of the reactor (6) housing and is as described above.
  • the exhaust air filter (8) and operation thereof is as described above.
  • the UV source (9) and operation thereof is as described above.
  • the catalyst (10) and operation thereof is as described above.
  • the programmable control unit (13) and operation thereof is as described above.
  • the ozone sensors (1 1 , 1 T) and operation thereof is as described above.
  • the space (14) to be disinfected may be separated from the disinfection system units to which the ozone and hydroxyl radicals are delivered through the duct (12') and the air would be extracted from such a space through the extraction duct (12").
  • the body of the ozone and hydroxyl radical generator (5') may be made of ozone-resistant materials such as aluminium, stainless steel AISI 304, polytetrafluoroethylene, glass, ceramics, or the like.
  • ozone and hydroxyl radicals are introduced into the duct (12") used for extracting air from closed environment containing an air pollution source (16).
  • the ozone and the hydroxyl radicals from at least two ozone and hydroxyl radicals’ generators (5’), through ducts (12') are fed to spaces (14) to be disinfected; one of such spaces being a space containing an air pollution source (16), and another space is delimited by the duct (12") for air extraction from the first space.
  • hydroxyl radicals essentially results in treatment and disinfection of drinking water or wastewater by ozonation, the treatment of wastewater pollutants using the Advanced Oxidation Process, including the Fenton oxidation process, and the decontamination and disinfection of the air in the gaseous state using ozone.
  • ozone is produced according to the following reaction (1 ):
  • molecular oxygen O2 is partially split to atomic oxygen / oxygen radical * 0, which is unstable and rapidly recombines back to form molecular oxygen and / or reacts with molecular oxygen to form ozone.
  • Ozone is an unstable compound and, within a few minutes of its formation, reacts with pollutants - reducing agents, or releases atomic oxygen, which in turn is a more powerful oxidant than ozone and also oxidizes pollutants, or recombines into molecular oxygen (3):
  • ozone can also form hydroxyl radicals according to the following reaction (4).
  • Hydroxyl radicals in the presence of reducing agents rapidly oxidize them or, otherwise, recombine to form oxygen (5) or, less frequently, hydrogen peroxide (6).
  • the bad odour air pollutants in the sewerage system by their nature are gaseous products of anaerobic bacteria activity and by their chemical properties are reducing agents. They are oxidized by strong oxidants - ozone and hydroxyl radical.
  • the formed sulphur dioxide can further oxidize to sulphur trioxide which is a particularly unstable, hygroscopic and strongly acidic substance. It interacts quickly with air humidity, forming droplets and most commonly with ammonia that is always present in the air of sewage system, forming hygroscopic non volatile and almost odourless salts such as ammonium sulphate. Droplets and ammonium salts fall out of the airflow and stick to surfaces or dissolve in water.
  • Ammonia reacts more slowly with ozone, and, depending on the conditions, three products are formed, usually in almost equal proportions - nitrous oxide, nitrogen and ammonium nitrate, non-volatile, hygroscopic salt according to the following equation (9).
  • Gaseous organic sulphur compounds form a complex mixture of mercaptans, thiols, and sulphides, each making low concentrations.
  • the most common compounds are dimethylsulfide and methylmercaptan.
  • the water-insoluble gaseous dimethyl sulphide is oxidized by ozone to form dimethyl sulfoxide according to the following equation (1 1 ).
  • Dimethyl sulfoxide is non-volatile (having boiling point of 189 °C), almost harmless, odourless, hygroscopic and highly soluble in water.
  • Dimethyl sulfoxide is partially removed from the airflow by adhering to surfaces and dissolving in water.
  • Methyl mercaptan (methantiol) is a highly toxic gaseous compound, relatively easily oxidized by both ozone and hydroxyl radicals. Oxidizing produces methane sulfonic acid (12). It is also weakly volatile (having boiling point of 167°C), hygroscopic and highly acidic material. It attracts moisture, forms salts with ammonia and is soluble in water.
  • the alkaline surface of the catalyst collects acidic oxidation products, such as sulphur oxides, from the airflow to form sulphites and sulphates, as shown in (16) and (17).

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  • Health & Medical Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Public Health (AREA)
  • Epidemiology (AREA)
  • Animal Behavior & Ethology (AREA)
  • Veterinary Medicine (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • General Health & Medical Sciences (AREA)
  • General Chemical & Material Sciences (AREA)
  • Environmental & Geological Engineering (AREA)
  • Analytical Chemistry (AREA)
  • Biomedical Technology (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Organic Chemistry (AREA)
  • Inorganic Chemistry (AREA)
  • Disinfection, Sterilisation Or Deodorisation Of Air (AREA)
  • Oxygen, Ozone, And Oxides In General (AREA)
  • Central Air Conditioning (AREA)
  • Physical Water Treatments (AREA)
  • Apparatus For Disinfection Or Sterilisation (AREA)

Abstract

L'invention porte sur un procédé de désinfection et de nettoyage d'air, d'eau et de surfaces solides comprenant la production d'ozone dans un environnement à humidité élevée et la distribution d'ozone et de radicaux hydroxyle ainsi obtenus à proximité de l'environnement à nettoyer et désinfecter. Le système de désinfection et de nettoyage d'air, d'eau et de surfaces solides comprend des générateurs d'ozone et de radicaux hydroxyle, des humidificateurs pour l'air destiné aux générateurs d'ozone et de radicaux hydroxyle, des filtres d'entrée et de sortie d'air, des ventilateurs d'admission et d'extraction d'air, une source d'UV, un catalyseur, une unité de commande programmable et des capteurs de concentration d'ozone.
PCT/IB2019/059208 2018-10-31 2019-10-28 Procédé et système de nettoyage et de désinfection WO2020089763A1 (fr)

Priority Applications (2)

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EP19824383.4A EP3787698A1 (fr) 2018-10-31 2019-10-28 Procédé et système de nettoyage et de désinfection
EA202092690A EA202092690A1 (ru) 2018-10-31 2019-10-28 Способ и система для очистки и дезинфекции

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LT2018545A LT6737B (lt) 2018-10-31 2018-10-31 Valymo ir dezinfekavimo būdas ir sistema
LTLT2018545 2018-10-31

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111686565A (zh) * 2020-07-25 2020-09-22 江苏万贤环境工程有限公司 微波紫外催化氧化废气处理成套装备
WO2023127832A1 (fr) * 2021-12-28 2023-07-06 キヤノン株式会社 Appareil d'alimentation en oxygène réactif, appareil de traitement utilisant de l'oxygène réactif, et méthode de traitement utilisant de l'oxygène réactif

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1500404A1 (fr) * 2003-07-22 2005-01-26 Steritrox Limited Stérilisation avec ozone, humidité et composant insaturé
GB2473245A (en) * 2009-09-07 2011-03-09 Steritrox Ltd An ozone generator
WO2016094658A1 (fr) * 2014-12-11 2016-06-16 Microlin, Llc Dispositifs de désinfection, de désodorisation et/ou de stérilisation d'objets
US20180250431A1 (en) * 2017-03-01 2018-09-06 Dbg Group Investments, Llc Method and device for enhancing the reduction of pathogens, allergens and odor-causing agents

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1500404A1 (fr) * 2003-07-22 2005-01-26 Steritrox Limited Stérilisation avec ozone, humidité et composant insaturé
GB2473245A (en) * 2009-09-07 2011-03-09 Steritrox Ltd An ozone generator
WO2016094658A1 (fr) * 2014-12-11 2016-06-16 Microlin, Llc Dispositifs de désinfection, de désodorisation et/ou de stérilisation d'objets
US20180250431A1 (en) * 2017-03-01 2018-09-06 Dbg Group Investments, Llc Method and device for enhancing the reduction of pathogens, allergens and odor-causing agents

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111686565A (zh) * 2020-07-25 2020-09-22 江苏万贤环境工程有限公司 微波紫外催化氧化废气处理成套装备
CN111686565B (zh) * 2020-07-25 2022-05-13 江苏万贤环境工程有限公司 微波紫外催化氧化废气处理成套装备
WO2023127832A1 (fr) * 2021-12-28 2023-07-06 キヤノン株式会社 Appareil d'alimentation en oxygène réactif, appareil de traitement utilisant de l'oxygène réactif, et méthode de traitement utilisant de l'oxygène réactif

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LT2018545A (lt) 2020-05-11
EP3787698A1 (fr) 2021-03-10
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EA202092690A1 (ru) 2021-03-31

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