A disinfection gas generating device and disinfection method

Abstract

This invention relates to the field of disinfection and sterilization technology, specifically to a disinfection gas generating device and method, comprising a hydroxyl radical generating section, a mixing section, and a reinforcing section. The hydroxyl radical mist generated in the generating section enters the mixing section and mixes with ozone. The mixing section is connected to the reinforcing section, allowing the mixed mist to then enter the reinforcing section. The reinforcing section is equipped with an ultraviolet lamp for exciting and / or degrading ozone. The aim is to form a highly oxidizing disinfection mist by mixing the generated hydroxyl radicals and ozone, which can meet various disinfection and sterilization needs; and since the ozone decomposes to produce water and oxygen, it will not cause secondary pollution to the surrounding air.

Description

Technical Field

[0001] This invention belongs to the field of disinfection and sterilization technology, specifically relating to a sterilization gas generating device and a sterilization method. Background Technology

[0002] Ozone possesses extremely strong oxidizing properties, with an oxidation potential reaching 2.07V. Under certain conditions, it can spontaneously decompose into oxygen and oxygen free radicals. The latter has extremely strong oxidizing activity, capable of decomposing pathogenic cells to achieve sterilization without leaving secondary pollution residues. It is easy to produce and is an ideal green oxidizing agent. Its broad-spectrum sterilization performance is excellent, exhibiting a strong inactivation ability against all vegetative bacteria, spores, and viruses. Its bactericidal ability is tens to hundreds of times stronger than chlorine-based disinfectants, and it has been widely recognized in the disinfection industry. However, to exert its extremely strong oxidizing and bactericidal ability, ozone requires the highest possible concentration. But high concentrations of ozone can damage the human respiratory system and eye mucous membranes, limiting the application areas of ozone.

[0003] Ozonator Environmental Solutions, a Canadian company, has developed a complex system to produce extremely high concentrations of ozone (>2000ppm) for the treatment of medical waste. It has excellent sterilization effects, but the equipment is expensive (over 4 million RMB) and requires extremely high airtightness. Leaks can cause serious damage.

[0004] Dissolving ozone in water to prepare hydroxyl radical-containing ozone water for disinfecting objects and airborne germs will help reduce ozone release. At the same time, the oxidation potential of hydroxyl radicals is 2.80 eV, which is stronger than ozone oxidation. It can undergo rapid chain reactions with most organic matter, directly mineralizing it into carbon dioxide and water, thus having a stronger sterilization ability.

[0005] The engineering application of highly reactive hydroxyl radicals still faces two major challenges: (1) how to generate high-concentration hydroxyl radicals in large quantities at low cost; and (2) how to effectively transport and diffuse hydroxyl radicals to the surface of pathogens, given their short lifespan of less than one second. Currently, methods for generating hydroxyl radicals include atmospheric pressure plasma excitation, high-energy ultraviolet light, photocatalytic oxidation, and electrocatalytic oxidation. However, most of these methods are expensive to manufacture and have not yet been successfully developed into engineering devices (such as those for medical waste and cold chain goods) and automatic control systems for large-scale surface disinfection. Summary of the Invention

[0006] To address the issues of residues and secondary pollution from chemical disinfection methods, and the high cost of imported ozone disinfection equipment, this invention provides a disinfection gas generating device. This device can mix generated hydroxyl radicals with ozone to form a highly oxidizing mixed disinfection mist that can meet various disinfection needs. After ozone decomposes, it produces water and carbon dioxide, which will not cause secondary pollution to the surrounding air.

[0007] The technical solution adopted in this invention is:

[0008] A disinfection gas generating device includes a hydroxyl radical generating section, a mixing section, and an enhancement section. The hydroxyl radical mist generated in the hydroxyl radical generating section enters the mixing section and mixes with ozone. The mixing section is connected to the enhancement section, so that the mixed mist enters the enhancement section again. The enhancement section is equipped with an ultraviolet lamp for exciting and / or degrading ozone.

[0009] Preferably, the hydroxyl radical generating section includes a first ozone generator, which is connected to a gas mixing device. The ozone generated by the first ozone generator and water are mixed in the gas mixing device and then passed through an atomizing device to form ozone water mist. The mixing section is equipped with a second ozone generator, and the enhancement section includes an ultraviolet lamp, which is correspondingly arranged with the catalyst plate.

[0010] Preferably, the gas mixing device is a honeycomb aeration pipe, which is installed in a water tank. An atomizing device, which is an ultrasonic atomizer, is installed in the water tank. Several baffles are installed in the mixing section, and the baffles are arranged alternately to form a mixing channel. The inlet of the mixing channel is connected to the outlet of the hydroxyl radical generation section and the outlet of the second ozone generator, respectively, and the outlet of the mixing channel is connected to the inlet of the enhancement section.

[0011] Preferably, the ultraviolet lamp is a 254nm single-band ultraviolet lamp or a 185nm / 254nm dual-band ultraviolet lamp.

[0012] Preferably, a first fan is provided at the outlet of the hydroxyl radical generation section, the first fan is opposite to the outlet of the second ozone generator, and the first fan and the outlet of the second ozone generator are located on both sides of the entrance of the S-shaped channel.

[0013] Preferably, a second fan is provided at the inlet of the first ozone generator, and the second fan is connected to the atmosphere; a third fan is provided at the inlet of the second ozone generator, and the third fan is connected to the atmosphere.

[0014] Preferably, the catalyst plate is provided as a plurality of catalyst plates, and the plurality of catalyst plates and ultraviolet lamps are arranged alternately to fill the internal space of the reinforcement section.

[0015] A disinfection method includes the following steps:

[0016] 1) Ozone is introduced into the sealed cavity within a first preset time and ultraviolet light with wavelengths of 185nm and 254nm is irradiated into the sealed cavity for the first stage of disinfection.

[0017] 2) After the first stage of disinfection is completed, disinfectant mist generated by the disinfection gas generating device is repeatedly introduced into the sealed cavity within a second preset time for the second stage of disinfection; or after the first stage of disinfection begins, disinfectant mist generated by the disinfection gas generating device is introduced into the sealed cavity, and the introduction of disinfectant mist is stopped before the first stage of disinfection ends.

[0018] 3) If ozone and disinfectant mist are introduced in stages, repeat the first stage of disinfection and the second stage of disinfection until the preset number of repetitions is reached;

[0019] 4) After step 3) is completed, the sealed cavity is heated and irradiated with ultraviolet light of 254nm wavelength for the third stage of disinfection within a third preset time.

[0020] Preferably, the first preset time is 10-40 min, the second preset time is 5-10 min, and the third preset time is 10-20 min.

[0021] Preferably, if disinfectant mist is introduced after the first stage of disinfection is completed, the disinfectant mist is introduced twice, each time for 30-60 seconds, and the time interval between the two introductions is 2 minutes; if disinfectant mist is introduced after the first stage of disinfection begins, it is introduced 10 minutes after the first stage begins, and the introduction time is 10 minutes.

[0022] The advantages of this invention are:

[0023] 1) This invention dissolves ozone in water through an aeration pipe to form ozone water, which is then atomized by an ultrasonic atomizer to produce ozone water mist. The high specific surface area ozone water mist combines with ozone again, dissolving even more ozone in the water. After being excited by ultraviolet light, it forms a gas-liquid mixed disinfection dry fog containing active oxygen and hydroxyl radicals. The high ozone concentration provides a basis for the production of high-concentration active free radicals. Utilizing the strong oxidizing properties of the disinfection dry fog to disinfect and sterilize items avoids the chemical residues produced by traditional chemical disinfection methods. Furthermore, the use of a mixture of ozone and hydroxyl radicals for disinfection is human-friendly and does not produce side effects.

[0024] 2) The ultraviolet lamps in the disinfection gas generating device of the present invention can be either 254nm single-band ultraviolet lamps or 185nm / 254nm dual-band ultraviolet lamps, depending on different usage requirements. These lamps can respectively degrade ozone and stimulate ozone. When the ozone concentration in the device is too high, a 254nm single-band ultraviolet lamp can be used to avoid excess ozone leakage. If the oxidation function is to be enhanced, a 185nm / 254nm dual-band ultraviolet lamp can be used to strengthen the oxidation effect. The device can be flexibly configured according to different application scenarios.

[0025] 3) The disinfection gas generating device of the present invention can be used in conjunction with a closed cavity or a semi-closed cavity. When used in conjunction with a closed cavity, the items to be disinfected can be directly placed in the closed cavity for disinfection. When used in conjunction with a semi-closed cavity, the disinfection mist generated by the disinfection gas generating device is sprayed out of the cavity to disinfect external items, or it can be used for the disinfection of moving items. The disinfection gas generating device of the present invention is environmentally friendly and has a wide range of applications.

[0026] 4) The particle size of the disinfectant mist in this invention is controllable. In this invention, a 40MHz high-amplitude ultrasonic atomizer is used for ultrasonic atomization to control the particle diameter of the disinfectant mist to <5μm, so that the sprayed disinfectant mist forms a white dry mist. When human hands come into contact with it, there is no dampness, achieving waterless disinfection. This prevents water droplets from forming on the surface of items when disinfecting and sterilizing them, thus affecting the use of the items. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of the sterilization gas generating device;

[0028] Figure 2 A flowchart of a disinfection method;

[0029] Figure 3 This is a flowchart for another type of disinfection process.

[0030] In the diagram: 1-First ozone generator, 2-Second ozone generator, 3-Water tank, 4-Ultrasonic atomizer, 5-Honeycomb aeration pipe, 6-Ultraviolet lamp, 7-Catalyst plate, 8-Baffle plate, 9-First fan, 10-Third fan, 11-Second fan. Detailed Implementation

[0031] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention.

[0032] Ozone's molecular structure is unstable at room temperature and pressure, quickly decomposing into oxygen and individual oxygen atoms. Individual oxygen atoms are highly reactive and possess strong oxidizing power, directly acting on bacteria, viruses, and volatile organic gases to achieve sterilization and disinfection. It is a green disinfectant. The hydroxyl radicals generated during the "dissolution" of ozone in water enhance the sterilization effect of ozone water. The oxidation potential of hydroxyl radicals is 2.80 eV, second only to fluorine's 2.87 eV, exhibiting extremely strong oxidizing properties. Water vapor can generate hydroxyl radicals under the synergistic effect of ultraviolet lamps and photocatalytic meshes. Therefore, this invention uses ozone, photocatalytic mesh plates, and ultraviolet lamps to form a disinfection system that does not require the addition of disinfectants or bactericides. This disinfection system has advantages such as being environmentally friendly and leaving no chemical residues.

[0033] like Figure 1 The diagram shows a disinfection gas generating device, comprising a hydroxyl radical generating section, a mixing section, and an enhancement section. Hydroxyl radical mist generated in the hydroxyl radical generating section enters the mixing section and mixes with ozone. The mixing section is connected to the enhancement section, allowing the mixed mist to then enter the enhancement section. The enhancement section is equipped with an ultraviolet lamp for exciting and / or degrading ozone. Figure 1 The direction indicated by the middle arrow is the direction in which the disinfection mist is generated and flows.

[0034] The hydroxyl radical generating section includes a first ozone generator 1, which is connected to a gas mixing device. The gas mixing device includes an aeration pipe, an ejector, or a vortex pump. In one embodiment of the present invention, it is a honeycomb aeration pipe 5. The ozone and water generated by the first ozone generator 1 are mixed in the gas mixing device and then pass through an atomizing device to form ozone water mist. In the present invention, the atomizing device is an ultrasonic atomizer. The mixing section is equipped with a second ozone generator 2. The enhancement section includes an ultraviolet lamp 6, which is correspondingly arranged with a catalyst plate 7.

[0035] In this embodiment, the aeration pipe 5 is connected to the first ozone generator 1. Air enters the first ozone generator 1 of the disinfection gas generating device through the second fan 11. The first ozone generator 1 is a tubular ozone generator. The air is converted into low-concentration ozone by the tubular ozone generator, and then the ozone is introduced into the water tank 3 through the honeycomb aeration pipe. The honeycomb aeration pipe can greatly increase the contact area between ozone and water, so that the generated ozone dissolves in the water to the maximum extent to form ozone water, and reduces the concentration of ozone released into the air (concentration < 20 mg / m³). 3The ozone water is then atomized into ozone water mist by a 40MHz high-amplitude ultrasonic atomizer 4. By controlling the oscillation frequency, the particle size of the ozone water mist is controlled, ensuring that the particle size is <5μm, forming a white dry fog. The white dry fog disperses inside the device and merges again with the ozone generated by the second ozone generator 2. The second ozone generator 2 is a tubular ozone generator that draws in air through the third fan 10 and converts it into ozone. After merging again, the ozone content in the disinfection fog is further increased, enabling it to generate a large number of hydroxyl radicals and oxygen radicals, while reducing the ozone concentration to <60mg / m³. 3 It enhances oxidation through a large number of hydroxyl radicals and oxygen radicals.

[0036] The disinfection gas generating device also includes ultraviolet lamps 6, which are correspondingly arranged with catalyst plates 7. Several catalyst plates 7 are arranged alternately with the ultraviolet lamps 6, filling the internal space of the enhancement section. The combined disinfection mist, after being excited by the ultraviolet lamps 6, can enhance the oxidation or degradation of excess ozone. When a 254nm single-band ultraviolet lamp is used, it degrades ozone, breaking down excess ozone. The degraded ozone contains hydroxyl radicals, ensuring that the disinfection mist achieves its disinfection purpose while preventing ozone leakage and harm to the human body. When a 185nm / 254nm dual-band ultraviolet lamp is used, it stimulates ozone production, generating more ozone. This results in the disinfection mist containing both ozone and hydroxyl radicals, enhancing its oxidative disinfection effect. In this case, it can be combined with an ozone degradation device to further degrade the excess ozone after disinfection, ensuring that ozone emissions meet standards and do not harm the environment or human health.

[0037] A further technical solution is that the first ozone generator 1 and the water tank 3 are arranged in the hydroxyl radical generation section, and the ultraviolet lamp 6 and the catalyst plate 7 are arranged in the enhancement section. The hydroxyl radical generation section and the enhancement section are independent of each other. Several baffles 8 are arranged in the mixing section, and the several baffles 8 are staggered to form an S-shaped mixing channel. The S-shaped mixing channel can enable ozone to be fully integrated into the ozone water mist, thereby improving the disinfection ability of the disinfection mist. The inlet of the S-shaped mixing channel is connected to the outlet of the hydroxyl radical generation section and the second ozone generator 2, and the outlet of the S-shaped mixing channel is connected to the inlet of the enhancement section.

[0038] The outlet of the hydroxyl radical generation section is provided with a first fan 9, which is opposite to the outlet of the second ozone generator 2. The outlets of the first fan 9 and the second ozone generator 2 are located on both sides of the inlet of the S-shaped channel, thereby ensuring that the generated hydroxyl radicals can be quickly mixed with ozone and mixed more completely during the flow through the S-shaped channel.

[0039] The table below compares the ozone concentration and disinfection capacity at different locations in different embodiments, using a 185nm / 254nm dual-band ultraviolet lamp, with ozone generator 1 being a 2-5g ozone generator and ozone generator 2 being a 10g ozone generator. The ozone concentration can be adjusted by replacing ozone generator 1 and ozone generator 2 according to actual usage requirements.

[0040]

[0041] In the table above, oxidation capacity is divided into 1-5 levels, with level 1 being the strongest and having the best disinfection ability. The oxidizing capacity grading method is as follows:

[0042] By placing the test strip in the device of the present invention for oxidation treatment, the color of the oxidized test strip after treatment is compared with that before placement, and the color difference is measured using a colorimeter. The color difference is judged according to the color difference classification in the national standard of colorimeter "National Metrological Verification Regulations of the People's Republic of China". The lighter the color, the stronger the oxidation ability, and the darker the color, the weaker the oxidation ability.

[0043] Disinfection was carried out using 3% hydrogen peroxide atomization, and the oxidation capacity was graded by a grading method. Based on color difference, the oxidation capacity of the 3% hydrogen peroxide atomization disinfection was graded as Level 2, and the surface disinfection kill rate of Bacillus subtilis was 98.62%.

[0044] Disinfecting gas generators can be used in various situations and combined with various devices to form disinfection systems. They can be used in enclosed spaces, where items to be disinfected are placed and disinfected by disinfecting mist. During use, an air compressor can be used to increase the positive pressure of the enclosed space, thereby enhancing the penetration of the disinfecting mist into the waste. The positive pressure is 100-600Pa. They can also be used in semi-enclosed / non-enclosed spaces, where disinfecting mist is sprayed out to disinfect the surrounding environment, items, or people.

[0045] For example, the disinfection gas generating device is installed in the rear compartment of the medical waste transport vehicle. The compartment contains the medical waste items to be disinfected. When in use, the compartment is closed, causing the disinfection gas generating device to produce disinfection mist to disinfect the medical waste. After disinfection is completed, the waste can be removed.

[0046] For example, a disinfection gas generator can be installed inside a trash can. When in use, the items to be disinfected, especially medical waste, are placed into the collection bag inside the trash can. The lid of the trash can is then closed. If necessary, the lid can be secured to the trash can using a lock or magnetic closure to maintain a seal, allowing the disinfection mist to enter the collection bag and disinfect the items inside. After disinfection is complete, the entire collection bag can be removed and discarded, and then a new collection bag can be replaced.

[0047] The disinfection gas generating device of the present invention can also be combined with a semi-enclosed space, so that the disinfection mist generated by the disinfection gas generating device is sprayed out from the jet nozzle to disinfect and sterilize the external environment.

[0048] For example, a disinfectant gas generating device can be installed inside a mobile cart equipped with a pipe that sprays disinfectant mist. The pipe can be rigid or flexible, allowing for the disinfection of the surrounding environment. Alternatively, the pipe can be directly inserted into a plastic bag to disinfect food or other items inside. An open pipe can also be used, allowing for different spray directions to meet various needs and perform large-area disinfection, thereby reducing the spread of viruses in the air. It can also be applied directly to the ground, using the cart's movement to disinfect germs on the ground.

[0049] For example, the disinfection gas generator can be installed inside a small box, which can be placed in a hospital or shopping mall. Users simply need to put their hands above the nozzle to disinfect their hands.

[0050] For example, a disinfection gas generating device can be installed in a disinfection shoe box to disinfect and sterilize the soles of shoes. The disinfection mist sprayed out acts directly on the soles of the shoes.

[0051] The disinfection gas generating device in this invention can also be used in conjunction with an ozone degradation device to degrade excess ozone, thereby ensuring that ozone does not cause environmental pollution due to leakage. The ozone degradation device can use a single-band 254nm ultraviolet lamp combined with a degradation catalyst plate to degrade ozone; or it can be combined with a negative ion generator to degrade ozone through photoelectric coupling.

[0052] For example, a disinfection gas generating device can be installed in an isolation workbench. Disinfecting air curtains are sprayed out through the nozzles on the workbench to isolate people on both sides of the workbench and prevent the spread of germs through the air. An ozone degradation device can be installed at the nozzles to degrade excess ozone, so that ozone does not overflow from the isolation workbench and affect the human body.

[0053] For example, disinfection gas generating devices can be applied to cargo transportation. In larger devices, cold chain cargo transportation can be carried out. After the cargo is disinfected by disinfection mist, the ozone at the cargo outlet is degraded by an ozone degradation device, thereby ensuring that the ozone concentration at the outlet meets emission standards after the cargo leaves the device.

[0054] A disinfection method for a disinfection system includes the following steps:

[0055] 1) Ozone is introduced into the sealed cavity within a first preset time and ultraviolet light with wavelengths of 185nm and 254nm is irradiated into the sealed cavity for the first stage of disinfection.

[0056] 2) After the first stage of disinfection is completed, disinfectant mist generated by the disinfection gas generating device is repeatedly introduced into the sealed cavity within a second preset time to carry out the second stage of disinfection.

[0057] 3) Repeat the first stage of disinfection and the second stage of disinfection until the number of repetitions reaches the preset number. The preset number of repetitions can be set according to the hazard level of the epidemic prevention waste. The higher the hazard level, the more preset number of repetitions.

[0058] 4) After step 3) is completed, the sealed cavity is heated and irradiated with 254nm wavelength ultraviolet light for a third preset time period to perform the third stage of disinfection. Heating can increase the temperature inside the space, accelerate the decomposition of ozone to achieve the purpose of eliminating ozone, and can also generate new active free radicals. Irradiating with ultraviolet light while heating can further inactivate residual viruses and further enhance the disinfection effect. In this embodiment, the sealed space is heated by using an infrared heater.

[0059] After the third stage of disinfection is completed, the ozone concentration in the enclosed space is collected. When the ozone concentration is below the safety threshold, the electronic door lock is unlocked. When the ozone concentration is not below the safety threshold, the third stage of disinfection is repeated.

[0060] The ozone concentration can be collected by corresponding sensors. The safety threshold can be set according to actual needs, for example, 2 ppm. The electronic door lock can only be unlocked and the sealed space can only be opened when the ozone concentration is lower than the safety threshold; otherwise, the third stage of disinfection will be repeated until the ozone concentration is lower than the safety threshold.

[0061] See Figure 2This is a flowchart of the disinfection method in this embodiment. In this embodiment, the first preset time is 10 minutes, the second preset time is 5-10 minutes, and the third preset time is 10-20 minutes. The disinfectant mist is introduced twice. The fourth preset time is 30-60 seconds, and the fifth preset time is 2 minutes. In a specific application, the first preset time is 10 minutes, the second preset time is 5 minutes, and the third preset time is 10 or 15 minutes. The disinfectant mist is introduced twice, the fourth preset time is 30 seconds, and the fifth preset time is 2 minutes. There are three preset times to choose from: 1 time, 3 times, and 7 times. For the user, these three preset times correspond to three disinfection modes: light disinfection mode, medium disinfection mode, and heavy disinfection mode. In the light disinfection mode, the third preset time is 10 minutes; in the medium and heavy disinfection modes, the third preset time is 15 minutes.

[0062] When operating the disinfection equipment, users first need to select a disinfection mode. If no mode is selected, the disinfection equipment will default to the mild disinfection mode.

[0063] The mild disinfection mode takes a total of 40 minutes, and its process is as follows:

[0064] From 0 to 10 minutes, ozone is introduced into the enclosed space and ultraviolet light with wavelengths of 185nm and 254nm is irradiated into the enclosed space for the first stage of disinfection.

[0065] From the 10th to the 15th minute, disinfectant mist was introduced into the enclosed space twice for the second stage of disinfection. Each introduction of disinfectant mist lasted for 30 seconds, and there was a 2-minute pause after each introduction of disinfectant mist.

[0066] From the 15th minute to the 30th minute, repeat the first stage of disinfection and the second stage of disinfection once;

[0067] From the 30th to the 40th minute, the enclosed space is heated and irradiated with ultraviolet light at a wavelength of 254nm for the third stage of disinfection.

[0068] The moderate disinfection mode takes a total of 1 hour and 15 minutes, and its process is as follows:

[0069] From 0 to 10 minutes, ozone is introduced into the enclosed space and ultraviolet light with wavelengths of 185nm and 254nm is irradiated into the enclosed space for the first stage of disinfection.

[0070] From the 10th to the 15th minute, disinfectant mist was introduced into the enclosed space twice for the second stage of disinfection. Each introduction of disinfectant mist lasted for 30 seconds, and there was a 2-minute pause after each introduction of disinfectant mist.

[0071] From the 15th minute to the 60th minute, repeat the first stage of disinfection and the second stage of disinfection three times.

[0072] From the 60th to the 75th minute, the enclosed space is heated and irradiated with ultraviolet light at a wavelength of 254nm for the third stage of disinfection.

[0073] The intensive disinfection mode took a total of 2 hours and 15 minutes, and its process is as follows:

[0074] From 0 to 10 minutes, ozone is introduced into the enclosed space and ultraviolet light with wavelengths of 185nm and 254nm is irradiated into the enclosed space for the first stage of disinfection.

[0075] From the 10th to the 15th minute, disinfectant mist was introduced into the enclosed space twice for the second stage of disinfection. Each time the disinfectant mist was introduced, the duration was 30 seconds, and there was a 2-minute pause after each introduction of hydroxyl radical water mist.

[0076] From the 15th minute to the 120th minute, repeat the first stage of disinfection and the second stage of disinfection 7 times;

[0077] From 120 to 135 minutes, the enclosed space is heated and irradiated with ultraviolet light at a wavelength of 254nm for the third stage of disinfection.

[0078] The disinfection method of this embodiment was compared with the conventional ozone disinfection method on the same amount of simulated waste for disinfection testing. According to the Ministry of Health's "Disinfection Technical Specifications" (2002 edition), the test bacteria was Bacillus subtilis (ATCC6633). Spore suspensions were taken, and the bacterial concentration was adjusted to approximately 1×10⁸ cfu / mL to 5×10⁸ cfu / mL based on the counting results. Sterilized carrier discs (filter paper or plastic fabric) were laid flat in sterile Petri dishes, and bacterial suspension was added dropwise to each disc. The amount of bacterial suspension added to each disc was 10 μL. A negative control was added with 10 μL of PBS. The above bacterial discs were placed in sterile Petri dishes and then placed in a sealed space for disinfection treatment for different times. The spore killing rate was then tested and calculated. The disinfection test data are shown in the table below.

[0079] The disinfection method in this embodiment and the disinfection test data of conventional ozone disinfection method.

[0080]

[0081]

[0082] As can be seen from the table, under the same ozone concentration (45 ppm) and disinfection time, the disinfection method in this embodiment has a much higher disinfect rate of Bacillus spores on the filter paper and fabric surface. This result also reflects the strong bactericidal ability of the disinfectant mist, which can effectively diffuse and penetrate into the surface of textiles for deep disinfection of bacteria. In contrast, conventional ozone disinfection methods are insufficient in their ability to disinfect Bacillus spores, especially on the surface of plastic fabrics, and have poor penetration. Only by extending the disinfection time and ozone concentration can the disinfect rate be improved, and even then, the disinfect rate of bacteria on the fabric surface is not high. In addition, this embodiment can achieve 100% kill of Bacillus spores by extending the disinfection time, and the ozone concentration has dropped below the safe concentration before the sealed space is opened. In contrast, conventional ozone disinfection methods still leave a large amount of ozone after disinfection, which may affect the safety of operators once the sealed space is opened.

[0083] Ozone and disinfectant mist generated by the disinfection gas generator are also simultaneously introduced within the first preset time period. (See reference) Figure 3 Here is a flowchart of this embodiment, and the steps are as follows:

[0084] 1) Ozone is introduced into the sealed cavity within a first preset time and ultraviolet light with wavelengths of 185nm and 254nm is irradiated into the sealed cavity for the first stage of disinfection.

[0085] 2) After the first stage of disinfection begins, disinfectant mist generated by the disinfection gas generating device is introduced into the sealed cavity, and the introduction of disinfectant mist is stopped before the first stage of disinfection ends.

[0086] 3) After the first stage of disinfection is completed, the enclosed space is heated and irradiated with ultraviolet light with a wavelength of 254nm for the second stage of disinfection within a second preset time.

[0087] In this embodiment, the processing method has a first preset time of 20-40 minutes and a second preset time of 20 minutes. During the first stage of disinfection, the disinfectant mist is introduced for 10 minutes. The disinfectant mist can be introduced 10 minutes after the start of the first stage of disinfection.

[0088] Users require minimal operation when using the disinfection equipment. Simply turn on the power, select the disinfection start button, and the equipment will automatically complete the disinfection process, which lasts for one hour. The procedure is as follows:

[0089] From 0 to 40 minutes, ozone is introduced into the enclosed space and ultraviolet light with wavelengths of 185nm and 254nm is irradiated into the space for the first stage of disinfection.

[0090] From the 10th to the 20th minute, disinfectant mist is introduced into the space;

[0091] From the 40th to the 60th minute, the space is heated and irradiated with ultraviolet light at a wavelength of 254nm for the second stage of disinfection.

[0092] Similar to the spore suspension sample in Example 13, the disinfection method of this example was used, and the measured data are shown in the table below.

[0093] The treatment method in this embodiment and the disinfection test data of conventional ozone disinfection methods.

[0094]

[0095] The above-described embodiments are preferred embodiments. It should be noted that the above-described preferred embodiments should not be considered as limitations on the invention, and the scope of protection of the invention should be determined by the scope defined in the claims. For those skilled in the art, several improvements and modifications can be made without departing from the spirit and scope of the invention, and these improvements and modifications should also be considered within the scope of protection of the invention.

Claims

1. A disinfection gas generating device, characterized in that: It includes a hydroxyl radical generation section, a mixing section and an enhancement section. The hydroxyl radical mist generated in the hydroxyl radical generation section enters the mixing section and mixes with ozone. The mixing section is connected to the enhancement section so that the mixed mist enters the enhancement section again. The enhancement section is equipped with an ultraviolet lamp (6) for exciting and / or degrading ozone. The hydroxyl radical generating unit includes a first ozone generator (1), which is connected to a gas mixing device. The ozone and water generated by the first ozone generator (1) are mixed in the gas mixing device and then passed through an atomizing device to form ozone water mist. The gas mixing device is a honeycomb aeration pipe (5), through which liquid and gas are mixed. The mixing unit is equipped with a second ozone generator (2). The mixing unit is equipped with several baffles (8), which are arranged in an alternating manner to form an S-shaped mixing channel. The S-shaped mixing channel is used for gas mixing. The inlet of the S-shaped mixing channel is connected to the outlet of the hydroxyl radical generating unit and the outlet of the second ozone generator (2), respectively. The outlet of the S-shaped mixing channel is connected to the inlet of the reinforcing unit.

2. The disinfection gas generating device according to claim 1, characterized in that: The enhancement section includes an ultraviolet lamp (6), which is correspondingly arranged with the catalyst plate (7).

3. The disinfection gas generating device according to claim 1, characterized in that: The honeycomb aeration pipe (5) is installed in the water tank (3), and the water tank (3) is equipped with an atomizing device, which is an ultrasonic atomizer.

4. The disinfection gas generating device according to claim 3, characterized in that: The ultraviolet lamp (6) is a 254nm single-band ultraviolet lamp or a 185nm / 254nm dual-band ultraviolet lamp.

5. The disinfection gas generating device according to claim 4, characterized in that: The outlet of the hydroxyl radical generation section is provided with a first fan (9), which is opposite to the outlet of the second ozone generator (2). The outlets of the first fan (9) and the second ozone generator (2) are located on both sides of the entrance of the S-shaped channel.

6. The disinfection gas generating device according to claim 5, characterized in that: A second fan (11) is provided at the inlet of the first ozone generator (1), and the second fan (11) is connected to the atmosphere; a third fan (10) is provided at the inlet of the second ozone generator (2), and the third fan (10) is connected to the atmosphere.

7. The disinfection gas generating device according to claim 2, characterized in that: The catalyst plate (7) is configured as a plurality of such catalyst plates (7) and ultraviolet lamps (6) are arranged alternately to fill the internal space of the reinforcement section.

8. A disinfection method using the disinfection gas generating device according to any one of claims 1 to 7, characterized in that: Includes the following steps: 1) Ozone is introduced into the sealed cavity within a first preset time and ultraviolet light with wavelengths of 185nm and 254nm is irradiated into the sealed cavity for the first stage of disinfection. 2) After the first stage of disinfection is completed, disinfectant mist generated by the disinfection gas generating device is repeatedly introduced into the sealed cavity within a second preset time for the second stage of disinfection; or after the first stage of disinfection begins, disinfectant mist generated by the disinfection gas generating device is introduced into the sealed cavity, and the introduction of disinfectant mist is stopped before the first stage of disinfection ends. 3) If ozone and disinfectant mist are introduced in stages, repeat the first stage of disinfection and the second stage of disinfection until the preset number of repetitions is reached; 4) After step 3) is completed, the sealed cavity is heated and irradiated with ultraviolet light of 254nm wavelength for the third stage of disinfection within a third preset time.

9. The disinfection method according to claim 8, characterized in that: The first preset time is 10-40 min, the second preset time is 5-10 min, and the third preset time is 10-20 min.

10. The disinfection method according to claim 9, characterized in that: If disinfectant mist is introduced after the first stage of disinfection, the disinfectant mist will be introduced twice, each time for 30-60 seconds, with a time interval of 2 minutes between the two introductions. If disinfectant mist is introduced after the first stage of disinfection begins, it should be introduced 10 minutes after the start of the first stage, and the introduction time should be 10 minutes.

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