Sterilization and disinfection method and application of plasma in indoor and greenhouse cultivation and planting

Abstract

The invention discloses a sterilization and disinfection method and application of plasmas in indoor and greenhouse cultivation and planting, and relates to the technical field of plasma application. High-energy plasma electrons can soften cell walls and break molecular chains to play a role in killing viruses and bacteria; the high-energy plasma can decompose harmful gases such as ammonia gas, formaldehyde and TVOC and peculiar smell into carbon dioxide and water, meanwhile, due to the fact that a large number of plasmas and negative oxygen ions exist in the air, smoke dust and PM2.5 and PM10 floating dust can be rapidly adsorbed and wrapped, the smoke dust and the PM2.5 and PM10 floating dust are made to settle to the ground, and the air purification effect is achieved. Air purification is achieved in a physical mode, use of chemical disinfectants is avoided, the problem of drug residues is solved, the safety of cultured products and crops is ensured, and meanwhile microorganisms cannot be induced to generate drug resistance. Meanwhile, plasma can promote seed germination and seedling growth, enhance disease resistance of animals and plants and improve stress resistance.

Description

Technical Field

[0001] The present invention relates to the technical field of plasma applications, specifically to the method and application of plasma for sterilization and disinfection in indoor and greenhouse farming and planting. Background Art

[0002] With the development of modern agricultural technology, indoor farming and planting have become important production methods to ensure the stable supply of agricultural products. However, the closed or semi-closed environment is prone to breed various pathogenic microorganisms, posing a serious threat to the health of animals and plants. Currently, the industry mainly adopts two disinfection technologies: chemical disinfection method and physical disinfection method.

[0003] Regarding the chemical disinfection method, conventional chemical agents such as chlorine-containing disinfectants and quaternary ammonium salt compounds are usually used for environmental disinfection. Although this method has a relatively low cost, there is an obvious risk of drug residues, which may affect the safety of the final product through the food chain. More seriously, the long-term use of the same type of disinfectant will cause microorganisms to develop drug resistance, forcing the continuous increase of the drug concentration, forming a vicious cycle. In addition, chemical disinfection requires frequent operations, which not only increases the labor cost, but also its volatile components may stimulate the respiratory tract of animals and plants, affecting their normal growth and development.

[0004] Regarding the physical disinfection method, represented by ultraviolet irradiation, the DNA structure of microorganisms is damaged by ultraviolet light with a wavelength of 254 nm. Although this method avoids chemical residues, it has obvious technical limitations: the disinfection effect is significantly affected by the distance, there are irradiation dead angles; continuous irradiation may damage animal and plant tissues; the lamp life is limited and needs to be replaced regularly; more importantly, it cannot achieve continuous purification of the air, and the disinfection effect is difficult to last.

[0005] Therefore, we propose the method and application of plasma for sterilization and disinfection in indoor and greenhouse farming and planting to solve the problems raised above.

[0006] The above information disclosed in this background art is only used to increase the understanding of the background art of the present invention. Therefore, it may include prior art that is not known to those of ordinary skill in the art. Summary of the Invention

[0007] The purpose of the present invention is to provide a method and application of plasma for sterilization and disinfection in indoor and greenhouse farming and planting to solve the problems raised in the above background art.

[0008] To achieve the above purpose, the present invention provides the following technical solutions:

[0009] A method for sterilization and disinfection of plasma in indoor and greenhouse farming and planting, comprising the following steps:

[0010] Step 1: Boost the input voltage to positive and negative high voltages of ±5kV to ±10kV through a boost circuit;

[0011] Step 2: ionizing the air using the positive and negative high voltages to generate plasma containing positive oxygen ions and negative oxygen ions;

[0012] Step 3: diffusing the plasma into the indoor space through a fan;

[0013] Step 4: allowing the plasma to contact with microorganisms in the air and encapsulate them;

[0014] Step 5: Allow the encapsulated microorganisms to settle to the ground.

[0015] Plasma sterilization and disinfection device, comprising:

[0016] Plasma generator; among them, high-energy plasma electrons can soften cell walls, break molecular chains, and kill viruses and bacteria. High-energy plasma can also decompose harmful gases and odors such as ammonia, formaldehyde, TVOC into carbon dioxide and water. At the same time, because there are a large number of plasma and negative oxygen ions in the air, they can quickly absorb and wrap smoke and PM2.5, PM10 floating dust, causing them to settle to the ground, thereby purifying the air.

[0017] A boost circuit connected to the plasma generator, used to generate positive and negative high voltages of ±5kV to ±10kV;

[0018] a blower system for spreading the plasma;

[0019] A control module is used to adjust the output voltage of the boost circuit and the rotation speed of the fan.

[0020] The application of plasma sterilization and disinfection methods in indoor and greenhouse breeding and planting in indoor farm air purification and greenhouse planting environment disinfection.

[0021] Compared with the prior art, the present invention has the following beneficial effects:

[0022] This invention achieves air purification through physical means, avoiding the use of chemical disinfectants, eliminating the problem of drug residues, and ensuring the safety of aquaculture products and crops, while also preventing the development of drug resistance in microorganisms. Plasma can also promote seed germination and seedling growth, enhancing the disease resistance of plants and animals and improving their resilience. Furthermore, compared to ultraviolet disinfection technology, plasma disinfection offers the advantage of comprehensive spatial coverage, effectively treating the air in the entire indoor space without blind spots, and without generating harmful radiation that could affect plant and animal growth.

[0023] The operating energy consumption of the present invention is significantly lower than that of traditional disinfection methods. The equipment has a long service life, simple maintenance, a safe and reliable implementation process, and does not cause harm to operators, animals, and plants during operation.

[0024] The above summary is only for the purpose of the specification and is not intended to be limiting in any way. In addition to the illustrative aspects, embodiments, and features described above, further aspects, embodiments, and features of the present invention will become apparent from the following detailed description. Brief Description of the Drawings

[0025] None Detailed Embodiments

[0026] The technical solutions in the embodiments of the present invention will be clearly and completely described below. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art without creative efforts based on the embodiments of the present invention belong to the scope of protection of the present invention.

[0027] Embodiment 1

[0028] Install the plasma generator on the top of the breeding house, and configure 1 plasma generator for every 100 cubic meters of space; connect to a 220V AC power supply and convert it to a 7kV DC high voltage through a boost circuit; start the axial flow fan, and the high-voltage electrode ionizes the air to generate plasma, including positive oxygen ions (O2 + ) and negative oxygen ions (O2 － ); the plasma diffuses with the air flow to the entire poultry house space and contacts the microorganisms in the air; the ions wrap the microbial particles, neutralize their charges and cause them to coagulate; the coagulated particles settle to the ground under the action of gravity; operate for 8 - 12 hours every day, run for 30 minutes and pause for 15 minutes.

[0029] Embodiment 2

[0030] Uniformly arrange 3 - 5 plasma diffusion ports along the greenhouse cultivation tank, set the working voltage to 6.5kV, and then generate plasma; operate in cooperation with the greenhouse ventilation system, and control the wind speed at 0.8m / s; the plasma interacts with the plant leaves and the pathogens in the air; regularly flush the ground to remove the settled microbial particles; adjust the operation duration according to the season, operate for 16 hours every day in the rainy season and 8 hours every day in the dry season.

[0031] Experimental Example 1

[0032] The laboratory temperature of the detection environment is 25°C, and the relative humidity is 44%.

[0033] The measured data is shown in the following table:

[0034] Serial number Test parameter Test result 1 Operating voltage Vp-p (kV) 11.4 2 Operating current Ip (mA) 72 3 Operating frequency v (kHz) 50 4 Breakdown voltage Vp-p (kV) 9.82 5 Plasma electron temperature T (eV) 0.31 6 <![CDATA[Plasma electron density (x10 18 m -3 )]]> 5.37

[0035] As can be seen from the above table, based on the measured plasma temperature (0.31 eV) and density (5.37×10 18 m -3 ) in the discharge region, it is judged that the air flowing through the plasma generator has an efficient bactericidal and disinfection effect.

[0036]

[0037] As can be seen from the above table, after measurement, the charge leakage index of each detection point is less than 0.5, within the measurement error range, that is, no plasma charge leakage of the plasma air disinfection machine is found.

[0038] Experimental Example 2

[0039] Experimental purpose: To test the circulating air volume of the plasma generator

[0040] 1. Inspection basis: GB 28235-2020 Hygienic Requirements for Ultraviolet Disinfection Devices, GB / T 14294-2008 Packaged Air Handling Units;

[0041] 2. Detection environment: Temperature 25.2℃, Humidity 59%RH;

[0042] 3. Detection steps: After the prototype is turned on at the corresponding gear, points are arranged on the outlet plane, and the speed of each point on the selected plane is measured with an anemometer. The measurement is repeated 3 times, and the average value is taken. The air volume is obtained from the air outlet plane wind speed and area;

[0043] 4. Detection gear: The disinfection gear is turned on during the test process.

[0044] 5. Calculation formula: Circulating air volume L = V×A

[0045] Where: V - Air outlet cross-section wind speed, m / s, A - Cross-section area, m 2 .

[0046]

[0047] As can be seen from the above table, the circulating air volume is 1290m 2 / h.

[0048] Experimental Example 3

[0049] 1. Inspection basis: GB15982-2012 "Hygienic Standards for Hospital Disinfection";

[0050] 2. Inspection environment: Temperature: (26 - 30)℃, Relative humidity: (70 - 73)%RH;

[0051] 3. Machine operating status: During the test, turn on the "disinfection mode".

[0052] 4. Disinfection method: During the test, place the prototype to be tested in a closed space according to the usage requirements. After the prototype is turned on to the set gear and disinfected for 120 minutes, samples are taken, and the test is repeated 3 times.

[0053] 5. Sampling method: Sampling by the plate sedimentation method: Sample the natural bacteria in the room air after the prototype is turned on. Set the inner, middle, and outer positions on the diagonal, 1 m away from the wall and 1.5 m above the ground for sampling. The sampling time after disinfection is 15 minutes, and the results are averaged.

[0054] The test site is a closed space simulating a hospital ward. Turn on the "disinfection mode" of the plasma generator for 120 minutes. The average total number of colony forming units in the air in this closed space is 10 CFU / dish (15 minutes). The test results are shown in the following table.

[0055]

[0056] Turn on the "disinfection mode" for 120 minutes to disinfect a closed space with a volume of about 30 m 3 After disinfection, the average total number of colony forming units in the air in this closed space is 1.0 CFU / dish, meeting the requirements of Class II environment in GB 15982-2012 "Hygienic Standards for Hospital Disinfection".

[0057] Experimental Example 4

[0058] 1. Inspection basis: GB / T 18202-2000 Hygienic Standards for Ozone in Indoor Air

[0059] 2. Place the machine to be tested in a closed space of 100 m 2 ;

[0060] 3. Measure the ambient background concentration value;

[0061] 4. After the machine is turned on, according to the standard requirements, measure the ozone concentration at 1.5 m above the ground. The measurement time is 1 hour, and the results are averaged.

[0062] 5. During the test, the operating status of the prototype is in the "disinfection" mode.

[0063]

[0064]

[0065] The plasma generator is turned on in the "disinfection" mode in a 100 m 3 closed space for 60 minutes. The average value of the ozone concentration in the air is <0.003 mg / m 3, it meets the requirement of the maximum allowable ozone concentration for a 1-hour average in the Hygienic Standard for Ozone in Indoor Air (GB / T 18202-2000).

[0066] In the description of this specification, the description referring to terms such as "one embodiment", "some embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in a suitable manner in any one or more embodiments or examples. In addition, without contradiction, those skilled in the art can combine and combine the different embodiments or examples described in this specification and the features of different embodiments or examples.

[0067] Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those of ordinary skill in the art can make changes, modifications, substitutions, and variations to the above embodiments within the scope of the present invention.

Claims

1. A method for sterilization and disinfection of plasma in indoor and greenhouse farming and planting, characterized in that, It includes the following steps: Step 1: Boost the input voltage to positive and negative high voltages of ±5 kV to ±10 kV through a boost circuit; Step 2: Ionize air using the positive and negative high voltages to generate a plasma containing positive oxygen ions and negative oxygen ions; Step 3: Diffuse the plasma into the indoor space through a blower; Step 4: Make the plasma contact with microorganisms in the air and wrap them; Step 5: Make the wrapped microorganisms precipitate to the ground.

2. The plasma sterilization and disinfection device according to claim 1, wherein It includes: A plasma generator; A boost circuit connected to the plasma generator for generating positive and negative high voltages of ±5 kV to ±10 kV; A blower system for diffusing the plasma; A control module for adjusting the output voltage of the boost circuit and the rotation speed of the blower.

3. The application of the method for sterilization and disinfection of the plasma according to claim 1 in indoor and greenhouse farming and planting in air purification of indoor farms and disinfection of greenhouse planting environments.

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