WO2010001279A1 - Dispositif de désinfection - Google Patents

Dispositif de désinfection Download PDF

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Publication number
WO2010001279A1
WO2010001279A1 PCT/IB2009/052194 IB2009052194W WO2010001279A1 WO 2010001279 A1 WO2010001279 A1 WO 2010001279A1 IB 2009052194 W IB2009052194 W IB 2009052194W WO 2010001279 A1 WO2010001279 A1 WO 2010001279A1
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WO
WIPO (PCT)
Prior art keywords
disinfecting device
ozone
inlet
disinfecting
ozone generator
Prior art date
Application number
PCT/IB2009/052194
Other languages
English (en)
Inventor
Clive Robert Fletcher
Original Assignee
Cape Winds Trading 27 Cc
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Cape Winds Trading 27 Cc filed Critical Cape Winds Trading 27 Cc
Publication of WO2010001279A1 publication Critical patent/WO2010001279A1/fr

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Classifications

    • A—HUMAN NECESSITIES
    • A23—FOODS OR FOODSTUFFS; TREATMENT THEREOF, NOT COVERED BY OTHER CLASSES
    • A23L—FOODS, FOODSTUFFS, OR NON-ALCOHOLIC BEVERAGES, NOT COVERED BY SUBCLASSES A21D OR A23B-A23J; THEIR PREPARATION OR TREATMENT, e.g. COOKING, MODIFICATION OF NUTRITIVE QUALITIES, PHYSICAL TREATMENT; PRESERVATION OF FOODS OR FOODSTUFFS, IN GENERAL
    • A23L3/00—Preservation of foods or foodstuffs, in general, e.g. pasteurising, sterilising, specially adapted for foods or foodstuffs
    • A23L3/34—Preservation of foods or foodstuffs, in general, e.g. pasteurising, sterilising, specially adapted for foods or foodstuffs by treatment with chemicals
    • A23L3/3454—Preservation of foods or foodstuffs, in general, e.g. pasteurising, sterilising, specially adapted for foods or foodstuffs by treatment with chemicals in the form of liquids or solids
    • A23L3/358—Inorganic compounds
    • A—HUMAN NECESSITIES
    • A23—FOODS OR FOODSTUFFS; TREATMENT THEREOF, NOT COVERED BY OTHER CLASSES
    • A23B—PRESERVING, e.g. BY CANNING, MEAT, FISH, EGGS, FRUIT, VEGETABLES, EDIBLE SEEDS; CHEMICAL RIPENING OF FRUIT OR VEGETABLES; THE PRESERVED, RIPENED, OR CANNED PRODUCTS
    • A23B7/00—Preservation or chemical ripening of fruit or vegetables
    • A23B7/14—Preserving or ripening with chemicals not covered by groups A23B7/08 or A23B7/10
    • A23B7/153—Preserving or ripening with chemicals not covered by groups A23B7/08 or A23B7/10 in the form of liquids or solids
    • A23B7/157—Inorganic compounds
    • A—HUMAN NECESSITIES
    • A23—FOODS OR FOODSTUFFS; TREATMENT THEREOF, NOT COVERED BY OTHER CLASSES
    • A23B—PRESERVING, e.g. BY CANNING, MEAT, FISH, EGGS, FRUIT, VEGETABLES, EDIBLE SEEDS; CHEMICAL RIPENING OF FRUIT OR VEGETABLES; THE PRESERVED, RIPENED, OR CANNED PRODUCTS
    • A23B7/00—Preservation or chemical ripening of fruit or vegetables
    • A23B7/14—Preserving or ripening with chemicals not covered by groups A23B7/08 or A23B7/10
    • A23B7/153—Preserving or ripening with chemicals not covered by groups A23B7/08 or A23B7/10 in the form of liquids or solids
    • A23B7/158—Apparatus for preserving using liquids
    • A—HUMAN NECESSITIES
    • A23—FOODS OR FOODSTUFFS; TREATMENT THEREOF, NOT COVERED BY OTHER CLASSES
    • A23L—FOODS, FOODSTUFFS, OR NON-ALCOHOLIC BEVERAGES, NOT COVERED BY SUBCLASSES A21D OR A23B-A23J; THEIR PREPARATION OR TREATMENT, e.g. COOKING, MODIFICATION OF NUTRITIVE QUALITIES, PHYSICAL TREATMENT; PRESERVATION OF FOODS OR FOODSTUFFS, IN GENERAL
    • A23L3/00—Preservation of foods or foodstuffs, in general, e.g. pasteurising, sterilising, specially adapted for foods or foodstuffs
    • A23L3/34—Preservation of foods or foodstuffs, in general, e.g. pasteurising, sterilising, specially adapted for foods or foodstuffs by treatment with chemicals
    • A23L3/3454—Preservation of foods or foodstuffs, in general, e.g. pasteurising, sterilising, specially adapted for foods or foodstuffs by treatment with chemicals in the form of liquids or solids
    • A23L3/3589—Apparatus for preserving using liquids
    • 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
    • A61L2/22—Phase substances, e.g. smokes, aerosols or sprayed or atomised substances
    • 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
    • A61L2/24—Apparatus using programmed or automatic operation
    • 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
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/72—Treatment of water, waste water, or sewage by oxidation
    • C02F1/78—Treatment of water, waste water, or sewage by oxidation with ozone
    • A—HUMAN NECESSITIES
    • A23—FOODS OR FOODSTUFFS; TREATMENT THEREOF, NOT COVERED BY OTHER CLASSES
    • A23V—INDEXING SCHEME RELATING TO FOODS, FOODSTUFFS OR NON-ALCOHOLIC BEVERAGES AND LACTIC OR PROPIONIC ACID BACTERIA USED IN FOODSTUFFS OR FOOD PREPARATION
    • A23V2002/00—Food compositions, function of food ingredients or processes for food or foodstuffs
    • 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
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2201/00—Apparatus for treatment of water, waste water or sewage
    • C02F2201/78—Details relating to ozone treatment devices
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2303/00—Specific treatment goals
    • C02F2303/04—Disinfection

Definitions

  • This invention relates to a disinfecting device, and more particularly, but not exclusively, to a disinfecting device for disinfecting food products
  • the invention also extends to a method for disinfecting food products
  • Microbial outgrowth is a primary concern amongst the food processing industry and consumers
  • the presence of pathogenic microorganisms on food products can potentially lead to food-borne outbreaks of disease
  • the most prominent pathogenic bacteria are those classified as Enterobacteriaceae and include organisms such as Escherichia coli, Salmonella spp and Enterobacter spp These types of bacteria are considered responsible for intestinal infections such as bacterial dysentery and bacterial food poisoning While efforts are made to control the existence of these types of bacteria in foods and in food processing facilities, large-scale food preparation operations often provide favourable environments for the growth of these organisms
  • chlorine-based chemicals for instance, sodium hypochlorite, calcium hypochlorite, and sodium dichloroisocyanurate
  • quaternary ammonium compounds that are employed for disinfecting food products
  • chlorine-based chemicals for instance, sodium hypochlorite, calcium hypochlorite, and sodium dichloroisocyanurate
  • quaternary ammonium compounds that are employed for disinfecting food products
  • chlorine-based chemicals for instance, sodium hypochlorite, calcium hypochlorite, and sodium dichloroisocyanurate
  • quaternary ammonium compounds that are employed for disinfecting food products
  • chlorine-based chemicals for instance, sodium hypochlorite, calcium hypochlorite, and sodium dichloroisocyanurate
  • quaternary ammonium compounds that are employed for disinfecting food products
  • chlorine-based chemicals for instance, sodium hypochlorite, calcium hypochlorite, and sodium dichloroisocyanurate
  • quaternary ammonium compounds that are employed for disinfecting food products
  • Ozone is typically produced by passing an oxygen-containing gas through ultraviolet light or through an ozone generator.
  • Ozone has shown to be a highly reactive oxidant capable of degrading microorganisms such as bacteria as well as pesticides and herbicides.
  • a further advantage of ozone relates to its natural decomposition into oxygen and thus its use in disinfecting food products is highly beneficial as it decomposes into a non-toxic gas.
  • ozone does not impart odour to or taint food products and no residual compounds or toxic residue is left on the food product or in the rinse water after application.
  • rinse water can be discharged to the environment or used for other applications without additional treatment or decontamination.
  • venturi injection systems and bubble diffusers have been used for many years.
  • water is forced through a conical body, initiating a pressure differential between the inlet and the outlet of the system. This creates a vacuum inside the body of the injector, thereby initiating ozone suction through the suction port.
  • bubble diffusers ozone is emitted through bubbles beneath the surface of the water.
  • a disinfecting device including: a conduit defining a flow passage between a first inlet for receiving water from a source and an outlet nozzle; the first inlet and the outlet nozzle being in flow communication; a second inlet for receiving a source of gaseous ozone; a mixing chamber for enabling the water introduced from the first inlet to mix with the source of gaseous ozone introduced from the second inlet to produce ozonized water; the ozonized water being emitted from the outlet nozzle as a fine spray of ozonized water droplets such that a maximum of 5% of free gaseous ozone is released into the atmosphere therefrom.
  • ozonized water is understood to refer to water that has been treated with ozone (O 3 ).
  • the first inlet is removably securable to a tap.
  • the inlet is screw threaded for engagement with the thread of an existing tap fitting.
  • the outlet nozzle is formed from a durable, ozone resistant material.
  • the ozone resistant material may be selected from polyvinyldene fluoride (PVDF), such as Kynar® PVDF, glass filled polypropylene, chlorinated PVC or polycarbonate.
  • PVDF polyvinyldene fluoride
  • the outlet nozzle may comprise a stainless steel outer sheath or may be constructed entirely from stainless steel. It will be appreciated that any type of ozone resistant material may be employed.
  • the invention further provides for the source of gaseous ozone to be produced by an electrically powered ozone generator of the type know in the art
  • a Corona Discharge ozone generator is employed
  • more than one ozone generator may be utilized, depending on the choice of ozone generator
  • two Corona Discharge ozone generators are employed
  • Each ozone generator typically delivers between 125 to 500 mg of gaseous ozone per hour to the first inlet of the disinfecting device
  • each ozone generator delivers between 250 to 350 mg of gaseous ozone per hour, most preferably 300 mg of gaseous ozone per hour
  • a maximum of 3% of free gaseous ozone is emitted into the atmosphere Most preferably, no free gaseous ozone is emitted
  • the Applicant believes that the ozone introduced into the disinfecting device from the second inlet coats the water droplets introduced from the first inlet In this way, the ozone is incorporated onto the ozonized water droplets such that no more than 5% of gaseous ozone, most preferably, no free gaseous ozone, is released into the atmosphere
  • the outlet nozzle is configured and dimensioned so as to allow for the ozonized water to be dispersed into ozonized water droplets having a particle size of 0 10 to 1 05 mm as the ozonized water is expelled through the outlet nozzle
  • the ozonized water droplets have a particle size of 0 05 to 1 00 mm
  • the invention further provides for the ozonized water to comprise at least 95 0% dissolved ozone
  • the ozonized water comprises between 97 0 % to 100 0 % dissolved ozone More preferably, the ozonized water comprises 100 0 % dissolved ozone
  • the disinfecting device of the present invention is employed to disinfect food products including, but not limited to, salads, fruit and vegetables Alternatively, the disinfecting device may be employed to disinfect utensils and surfaces upon which food is to be place It will be appreciated that the disinfecting device is not limited to the above and may even be employed to disinfect a user's hands
  • the disinfecting device allows for a spray of ozonized water droplets to be emitted from the outlet nozzle This spray facilitates the removal of the bacteria and pesticides from the food products, utensils and surfaces
  • the invention provides for a hose to be connected to the ozone generator at a first end thereof and to be removably connected to the second inlet of the disinfecting device at an opposite end thereof, such that the hose defines a flow passage between the ozone generator and the second inlet of the disinfecting device for enabling flow communication between the ozone generator and the second inlet
  • a pump is employed to pump the gaseous ozone produced by the ozone generator through the hose to be delivered to the second inlet of the disinfecting device and into the mixing chamber
  • a power supply unit is employed for supplying power to the ozone generator
  • the power supply may be in the form of a battery
  • the invention yet further provides for the ozone generator and pump to be housed in a housing
  • the housing may be removably mounted to a wall in order to facilitate storage of the housing
  • the housing is mounted to a wall by means of screws, cable ties or any other suitable attachment means
  • the housing includes an inlet for allowing air to be introduced into the housing and into the pump
  • a filter is located over the inlet for removing dust and particles from the air entering the pump
  • the filter is a mesh filter
  • the housing is made of ozone-resistant material
  • the ozone resistant material may be selected from polyvinyldene fluo ⁇ de (PVDF), such as Kynar® PVDF, glass filled polypropylene, chlorinated PVC or polycarbonate It will be appreciated that any type of ozone resistant material may be employed
  • the housing includes a sealing member for ensuring that the components housed therein remain dry
  • a pressure control mechanism is provided.
  • the pressure control mechanism is in the form of a pressure sensor of the type described in the art.
  • the disinfecting device to include a pressure measuring port.
  • a pipe is connected to the pressure sensor at a first end thereof and is removably connected to the pressure measuring port at an opposite end thereof, the hose defining a flow passage between the pressure sensor and the pressure measuring port for enabling communication between the pressure sensor and the pressure measuring port.
  • the pressure sensor prefferably be activated by an increase in pressure at the pressure measuring port of the disinfecting device that results when water is introduced through the first inlet from the tap into the conduit.
  • a PC board is further contained in the housing.
  • the PC board may be of the type known and described in the art.
  • the PC board is adapted to include a plurality of sensors together with a micro-controller.
  • the present invention provides for the pressure sensor to be in communication with the PC board, such that when the pressure sensor is activated, the PC board is programmed so as to activate the power supply unit, which provides power to the ozone generator, and the pump. In this way, activation of the pressure sensor causes the pump to deliver gaseous ozone generated by the ozone generator to the second inlet of the disinfecting device and into the mixing chamber.
  • the pressure sensor is activated when the pressure at the pressure measuring port reaches between 1.8 to 2.3 bar and is deactivated when the pressure at the pressure measuring port is between 0.8 to 1.2 bar. More preferably, the pressure sensor is activated at a pressure of 2.0 bar and is deactivated at a pressure of 1.0 bar.
  • a method for disinfecting food products including the steps of: (i) providing a source of gaseous ozone; (ii) contacting the source of gaseous ozone with water to produce ozonized water; and
  • step (i) The source of gaseous ozone in step (i) is produced as described hereinabove.
  • FIG. 1 is a top perspective view of a disinfecting device according to the invention wherein the disinfecting device is connected to an ozone generator, pump and power supply unit housed within a housing;
  • Figure 2 is a top perspective view of the disinfecting device and housing of Figure
  • a PC board is also included within the housing and wherein the disinfecting device is, in operation, connected to a tap;
  • Figure 3 is a cross sectional front view of the disinfecting device of Figure 1 ;
  • Figure 4 is an exploded perspective view of the disinfecting device and housing of
  • Figure 2; and Figure 5 is a perspective view of the disinfecting device and housing of Figure 2, wherein the housing is closed so as to conceal the components contained therein.
  • a disinfecting device is generally indicated by reference number 1.
  • FIGs 1 to 5 depict a disinfecting device 1 which includes a body 3 having a first inlet 2 for receiving water from a tap 4 and an outlet nozzle 5.
  • the disinfecting device 1 includes a conduit 8 defining a flow passage between the first inlet 2 and the outlet nozzle 5 whereby the first inlet 2 and the outlet nozzle 5 are in fluid flow communication.
  • the disinfecting device 1 further includes a second inlet 6 for receiving gaseous ozone and a pressure measuring port 14 discussed in more detail herein below.
  • a mixing chamber 7 is included in the body 3 of the disinfecting device 1 for enabling the water introduced from the first inlet 2 to mix with the gaseous ozone introduced from the second inlet 6 in order to produce ozonized water. Droplets of ozonized water are emitted from the outlet nozzle 5 such that no free gaseous ozone is released into the atmosphere by virtue of operation of the system.
  • the first inlet 2 is screw threaded to allow the inlet 2 to be screwed onto an existing tap fitting 4.
  • the gaseous ozone is produced by an electrically powered ozone generator 9 of the type know in the art.
  • a Corona Discharge (CD) ozone generator is employed.
  • the generator together with further components discussed in detail herein under, is housed in a housing 12.
  • an connecting means 21 , an outlet 22 and a power supply inlet 16 are located on an inside surface of a sidewall of the housing 12.
  • a pipe 15 is connected to the connecting means 21 at a first end thereof and is connected to the pressure port 14 of the disinfecting device 1 at an opposite end thereof.
  • a hose 10 is connected to the outlet 20 at a first end thereof and is connected to the second inlet 6 of the disinfecting device 1 at an opposite end thereof.
  • Figure 5 depicts a power cable 22 which is connected to a 12V step down transformer 23 at one end thereof and to the power supply inlet 16 at its opposite end
  • a power supply unit 11 in the form of a battery, an air pump 18, a pressure sensor 13 and a PC board 17 are also contained within the housing 12 (as shown in Figures 1 and 2) It will be appreciated that the air pump 18 and the pressure sensor 13 are of the type known and described in the art
  • the PC board 17 described in this particular embodiment comprises a number of sensors and a micro-controller (not shown)
  • the micro-controller is programmed with firmware, which is installed by means of a 9 pin D type connector on the PC board 17
  • Chord 31 is connected to the connecting means 21 in order to enable the pipe 15 to be in communication with the pressure sensor 13
  • the pressure sensor 13, in turn, is in contact with the PC board 17
  • Chord 29 delivers power from the power supply inlet 16 to the PC board 17 whilst cords 30 enable the air pump 18 and the battery 11 to be in communication with the PC board 17
  • Cord 24 connects the ozone generator 9 to the battery 11
  • cord 25 connects the air pump 18 to the ozone generator 9 and
  • Figures 1 , 2 and 4 further show a sealing member 19 placed around the edge of the bottom base of the housing 12 for ensuring that the components of the housing 12, discussed above, remain dry
  • FIG. 3 further depicts a filter member 22 located above an inlet (not shown) on the bottom base of the housing 12 for removing dust and particles from the air entering through said inlet and into the air pump 18
  • a decorative cover 23 is positioned above the removable cover of the housing 12, as shown in Figures 4 and 5 It will be appreciated that the decorative cover 23 may include, inter alia, branding for advertising purposes
  • the housing 12 containing, inter alia, the ozone generator 9, the battery 11 , the air pump 18, the pressure sensor 13 and the PC board 17, is mounted to a wall (not shown) inside a kitchen or restaurant either with screws, cable ties or any other suitable attachment means.
  • the first inlet 2 of the disinfecting device 1 is to be screwed onto an existing tap fitting 4 and the food products to be disinfected are to be placed beneath the outlet nozzle 5 of the disinfecting device 1 , Thereafter, a user will turn on the tap 4 and the 12V step down transformer 32.
  • the transformer 32 When the transformer 32 is switched on, the electricity will pass through the power supply inlet 16 and be introduced into chord 29 thereby supplying the PC board 17 with the requisite power.
  • the tap is switched on, the water flowing from the tap 4 will enter the disinfecting device 1 through the first inlet 2 and flow through the conduit 8.
  • the ozone generator 9 will produce gaseous ozone and the pump 18 will cause this gaseous ozone to be pumped from the ozone generator 9 through chord 26, out the outlet 20 and though the hose 10 to be delivered to the second inlet 6 of the disinfecting device 1 and into the mixing chamber 7.
  • the mixing chamber 7 As the water enters the mixing chamber 7 from the conduit 8, it will mix with the gaseous ozone introduced from the second inlet 6 to produce ozonized water.
  • the dimension and configuration of the outlet nozzle 5 allows the ozonized water produced in the mixing chamber 7 to be dispersed into ozonized water droplets having a particle size of 0.10 to 1.05 mm as the ozonized water is expelled through the outlet nozzle 5.
  • This spray of water droplets facilitates the removal of the bacteria and pesticides from the food products while the ozonized water produced in the mixing chamber 7 degrades the bacteria and pesticides present on the food products.
  • the ozonized water droplets are emitted from the outlet nozzle 5 such that no free gaseous ozone is released into the atmosphere. Once the food products have been washed and sanitized, the user will turn off the tap 4.
  • the control mechanism includes the pressure sensor 13 and the PC board 17, as mentioned herein above.
  • the PC board 17 not only switches on the air pump 18, the battery 11 and the ozone generator 9 when the pressure resulting from the flow of fluid into the disinfecting device 1 activates the pressure sensor 13, but it also controls the ozone/air mixture flow rate and sensors the inlet pressure of the ozone generator 9 and the temperature within the ozone generator 9.
  • the LED light 27 and/or the alarm 28 will be activated. According to Table 1 , the LED light 27 will flash green, orange or red in response to the any possible faults associated with the operating conditions of the components contained in the housing 12.
  • the alarm 28 will be activated either together with the LED light 27 or separately. In this way, the LED light 27 and/or the alarm 28 will alert a user of the fault associated with the respective operating condition.
  • Table 1 Data stipulating possible faults associated with the operating conditions of the components contained in the housing and the corresponding colour of the LED light for purposes of alerting a user of the fault
  • the tomatoes inoculated with Coliforms were plated on chromocult agar growth media and incubated at a temperature of 37°C for a time period of 24 hours
  • the tomatoes inoculated with E coli were plated on chromocult agar growth media and incubated at a temperature of 37°C for a time period of 24 hours
  • the tomatoes inoculated with Salmonella spp were incubated in peptone water at a temperature of 35 0 C for 24 hours Thereafter, 0 1 ml of the peptone water was inoculated into rappaport-vassiliadis soya peptone broth and incubated at a temperature of 32°C for a time period of between 24 to 48 hours The broth mixture was then sub- cultured onto selective XLD agar growth media plates and incubated at a temperature of 35 0 C for a time period of between 18 to 24 hours.
  • the tomatoes inoculated with S. aureus were plated on baird parker agar growth media and incubated at a temperature of 37°C for a time period of between 48 to 96 hours.
  • the inoculated tomatoes were thereafter washed with (i) chlorine gas and (ii) ozonized water produced by the disinfecting device of the present invention for a total time period of 5 minutes.
  • the surfaces of the tomatoes were swabbed and analyzed under a normal-light dissecting microscope in order to determine the number of bacterial collonies present on the tomatoes after the disinfecting agents had been applied.
  • a comparative analysis was carried out in order to compare the number of collonies present on the tomatoes after disinfecting the tomatoes with the aforesaid disinfecting agents. The presence of the following collonies was analysed:
  • Table 2 SGS comparative analysis of bacterial colony count after application of different disinfecting agents used to disinfect inoculated tomatoes
  • the above data indicates that bacterial collonies of Coliforms, Escherichia coli, Salmonella spp, and Staphylococcus aureus were detected on the tomatoes after the application of chlorine gas as a disinfecting agent.
  • the above results further indicate that after the application of ozonized water produced by the disinfecting device of the present invention, Coliforms, Escherichia coli, Salmonella spp, and Staphylococcus aureus were not detected on the tomatoes.
  • the ozonized water produced in accordance with the present invention is highly effective in degrading the bacteria, including Coliforms, Escherichia coli, Salmonella spp, and Staphylococcus aureus, present on the tomatoes.
  • Yet a further advantage associated with the disinfecting device of the present invention resides in its ability to operate economically Once the first inlet of the disinfecting device has been secured to the tap fitting, the second inlet and the pressure port have been connected to their respective hoses and the housing has been mounted to a wall, the unit comprising the disinfecting device and the housing requires only electricity, to operate the ozone generator, and air, to be fed into the ozone generator to produce the gaseous ozone, as consumables
  • the present invention is yet further advantageous in that it provides for CT values of between 4 00 and 6 00
  • the CT value is determined from the concentration (C in mg/l or ppm) and the contact time (T in minutes) of a specific disinfecting agent employed and thus indicates the effectiveness of the disinfecting agent
  • the CT values obtained from the present invention are significantly superior to CT values of between 1 86 and 1 90 obtained by prior art disinfecting processes
  • the configuration and dimensions of the outlet nozzle provides for a spray of ozonized water droplets to be emitted from the outlet nozzle This spray facilitates the removal of the bacteria and micro-organisms from the food products
  • the Applicant of the present invention has found that the disinfecting device operates optimally at a contact time of five minutes with respect to the food product to be sanitized This is most beneficial, as the chlorine compounds previously employed to disinfect food produce required a contact time of at least 15 minutes before bacterial degradation would ensue. Furthermore, the use of chlorine compounds potentially resulted in the production of toxic by-products such as chloramines and trihalomethanes (THMs). In contrast, ozone does not leave any toxic residue on the food product or in the rinse water after application, such that the rinse water can be discharged to the environment without additional treatment or purification.
  • TPMs trihalomethanes
  • the disinfecting device according to the present invention will be employed in restaurants where large-scale food preparation operations often require food produce to be sanitized and disinfected before use. It is further envisaged that the disinfecting device may be employed, not only for sanitizing food products, but also for sanitizing users' hands and utensils used during the preparation of food.

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  • Chemical & Material Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Health & Medical Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • Food Science & Technology (AREA)
  • Polymers & Plastics (AREA)
  • Inorganic Chemistry (AREA)
  • Organic Chemistry (AREA)
  • Wood Science & Technology (AREA)
  • Zoology (AREA)
  • Epidemiology (AREA)
  • Animal Behavior & Ethology (AREA)
  • General Health & Medical Sciences (AREA)
  • Public Health (AREA)
  • Veterinary Medicine (AREA)
  • Nutrition Science (AREA)
  • Hydrology & Water Resources (AREA)
  • Environmental & Geological Engineering (AREA)
  • Water Supply & Treatment (AREA)
  • Apparatus For Disinfection Or Sterilisation (AREA)

Abstract

La présente invention concerne un dispositif de désinfection, et plus particulièrement un dispositif de désinfection des produits alimentaires. Un premier aspect de l'invention concerne en l'occurrence un dispositif (1) de désinfection comportant un conduit définissant un passage d'écoulement entre un premier orifice (2) d'entrée pour l'alimentation en eau et une buse de sortie, le premier orifice d'entrée et la buse (5) de sortie étant en communication fluidique. Le dispositif comprend également un second orifice (6) d'entrée pour l'alimentation en ozone gazeux. Le dispositif comprend enfin une chambre (7) de mélange permettant à l'eau introduite par le premier orifice d'entrée de se mélanger avec l'ozone gazeux arrivant par le second orifice de façon à produire de l'eau ozonisée. L'eau ozonisée est émise par la buse (5) de sortie sous forme d'un fin brouillard de gouttelettes d'eau ozonisée de façon que la proportion d'ozone gazeux libre se dégageant dans l'atmosphère ne dépasse pas 5%. L'invention concerne aussi un procédé de désinfection de produits alimentaires.
PCT/IB2009/052194 2008-07-04 2009-05-26 Dispositif de désinfection WO2010001279A1 (fr)

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ZA2008/05852 2008-07-04

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WO2012153303A1 (fr) 2011-05-12 2012-11-15 Arcaqua (Pty) Ltd Dispositif de désinfection à base d'ozone comprenant un capteur d'écoulement
WO2012153305A2 (fr) 2011-05-12 2012-11-15 Arcaqua (Pty) Ltd Dispositif de désinfection à base d'ozone et mélangeur pour celui-ci
EP2582621A4 (fr) * 2010-06-16 2015-09-16 Food Safety Technology Llc Unité de distribution de liquide ozoné
GB2547227A (en) * 2016-02-11 2017-08-16 J W European Ltd Treatment of fresh produce material
CN109588473A (zh) * 2019-01-14 2019-04-09 湖北省农业科学院农产品加工与核农技术研究所 水产品喷淋减菌装置
WO2019086985A1 (fr) * 2017-10-30 2019-05-09 Coetzee Andre Johan Station de désinfection et son procédé d'utilisation

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EP2582621A4 (fr) * 2010-06-16 2015-09-16 Food Safety Technology Llc Unité de distribution de liquide ozoné
RU2583813C2 (ru) * 2011-05-12 2016-05-10 Аркаква (Пти) Лтд Дезинфицирующее устройство с использованием озона и датчик расхода для него
US9392815B2 (en) 2011-05-12 2016-07-19 Arcaqua (Pty) Ltd Ozone-based disinfecting device and mixer therefor
CN103702948A (zh) * 2011-05-12 2014-04-02 阿克华公司 包括流量传感器的臭氧型消毒设备
JP2014518705A (ja) * 2011-05-12 2014-08-07 アークアクア・プロプライエタリー・リミテッド 流量センサを備えたオゾンベースの殺菌装置
US20140369891A1 (en) * 2011-05-12 2014-12-18 Arcaque (Pty) Ltd. Ozone-Based Disinfecting Device Comprising a Flow Sensor
US8951477B2 (en) 2011-05-12 2015-02-10 Arcaqua (Pty) Ltd. Ozone-based disinfecting device comprising a flow sensor
WO2012153305A3 (fr) * 2011-05-12 2013-01-03 Arcaqua (Pty) Ltd Dispositif de désinfection à base d'ozone et mélangeur pour celui-ci
WO2012153303A1 (fr) 2011-05-12 2012-11-15 Arcaqua (Pty) Ltd Dispositif de désinfection à base d'ozone comprenant un capteur d'écoulement
WO2012153305A2 (fr) 2011-05-12 2012-11-15 Arcaqua (Pty) Ltd Dispositif de désinfection à base d'ozone et mélangeur pour celui-ci
US9451787B2 (en) * 2011-05-12 2016-09-27 Arcaqua (Pty) Ltd. Ozone-based disinfecting device comprising a flow sensor
AU2012251988B2 (en) * 2011-05-12 2016-11-10 Arcaqua (Pty) Ltd Ozone-based disinfecting device comprising a flow sensor
KR101924454B1 (ko) * 2011-05-12 2018-12-03 아크아쿠아 (피티와이) 엘티디 흐름 센서를 포함하는 오존-기반 살균 장치
GB2547227A (en) * 2016-02-11 2017-08-16 J W European Ltd Treatment of fresh produce material
WO2019086985A1 (fr) * 2017-10-30 2019-05-09 Coetzee Andre Johan Station de désinfection et son procédé d'utilisation
CN109588473A (zh) * 2019-01-14 2019-04-09 湖北省农业科学院农产品加工与核农技术研究所 水产品喷淋减菌装置

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