KR20120098542A - Plasma spray for sterilization and storing agricultural products and method for treating agricultural products using the same - Google Patents

Plasma spray for sterilization and storing agricultural products and method for treating agricultural products using the same Download PDF

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KR20120098542A
KR20120098542A KR1020120020516A KR20120020516A KR20120098542A KR 20120098542 A KR20120098542 A KR 20120098542A KR 1020120020516 A KR1020120020516 A KR 1020120020516A KR 20120020516 A KR20120020516 A KR 20120020516A KR 20120098542 A KR20120098542 A KR 20120098542A
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plasma
agricultural products
sterilization
atmospheric pressure
supply unit
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KR1020120020516A
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Korean (ko)
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박태정
이석재
이태재
허남수
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한국과학기술원
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    • 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
    • A23B7/015—Preserving by irradiation or electric treatment without heating effect
    • 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
    • A23B7/144—Preserving or ripening with chemicals not covered by groups A23B7/08 or A23B7/10 in the form of gases, e.g. fumigation; Compositions or apparatus therefor
    • A23B7/148—Preserving or ripening with chemicals not covered by groups A23B7/08 or A23B7/10 in the form of gases, e.g. fumigation; Compositions or apparatus therefor in a controlled atmosphere, e.g. partial vacuum, comprising only CO2, N2, O2 or H2O
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B7/00—Spraying apparatus for discharge of liquids or other fluent materials from two or more sources, e.g. of liquid and air, of powder and gas
    • B05B7/16—Spraying apparatus for discharge of liquids or other fluent materials from two or more sources, e.g. of liquid and air, of powder and gas incorporating means for heating or cooling the material to be sprayed
    • B05B7/22—Spraying apparatus for discharge of liquids or other fluent materials from two or more sources, e.g. of liquid and air, of powder and gas incorporating means for heating or cooling the material to be sprayed electrically, magnetically or electromagnetically, e.g. by arc

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  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • Wood Science & Technology (AREA)
  • Zoology (AREA)
  • Food Science & Technology (AREA)
  • Polymers & Plastics (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Storage Of Fruits Or Vegetables (AREA)
  • Plasma Technology (AREA)

Abstract

PURPOSE: An atmosphere plasma injection apparatus for sterilizing and storing agricultural products, and a processing method of the agricultural products using thereof are provided to sterilize microorganisms from the surface of the agricultural products. CONSTITUTION: An atmosphere plasma injection apparatus comprises a plasma inducing module(10) having 0.5-1mm interval between an electrode and the ground, a gas supplying unit(20), and a power supplying unit(30). Plasma produced from the atmosphere plasma injection apparatus sterilizes microorganisms from the surface of agricultural products, by using ethylene glycol or ethylene oxide generated from decomposing ethylene gas produced from the agricultural products. The agricultural products are fruits, flowers, or vegetables. The atmosphere plasma injection apparatus includes more than one plasma inducing module.

Description

Atmospheric pressure plasma spray device for sterilizing and storing agricultural products and processing method of agricultural products using the same {Plasma Spray for Sterilization and Storing Agricultural Products and Method for Treating Agricultural Products Using the Same}

The present invention relates to an atmospheric pressure plasma spray device for agricultural products sterilization and storage, and a method of processing agricultural products using the same, and more particularly, comprising a plasma induction module having a distance between the electrode and the ground of 0.5 to 1.0 mm, a gas supply unit, and a power supply unit. The present invention relates to an atmospheric pressure plasma spray apparatus for sterilizing and storing agricultural products and a method of treating agricultural products using the same.

Recently, with the spread of safe food culture and well-being culture, demand for various fruits and vegetables is increasing, and distribution of high value-added agricultural products is active, which keeps fruits and vegetables safe and fresh for distributors, fooders, and the general household. The demands of the times are increasing.

When agricultural products are stored in storage or packing containers, ethylene gas is naturally generated from the agricultural products, and the agricultural products are matured. If the concentration is high, the fruits, vegetables, flowers, etc. are quickly wilted to deteriorate the product value. . In practice, ethylene gas of more than 0.01 ppm is known to affect fruits and vegetables. In particular, bananas are ripened at an ethylene concentration of 0.2 ppm or more, resulting in yellow color of the banana surface. Even after harvesting, fruits, vegetables, and flowers breathe to produce ethylene gas, and when the concentration of ethylene rises above a certain level, rapid maturation occurs, which rots quickly and becomes impossible to store. At this time, if the ethylene generated during the storage of fruits, vegetables, and flowers is continuously removed, the maturity of the fruits or vegetables in the stored state is lowered, so that it is possible to store them for a long time without preventing decay for a long time.

Related arts related to this include patent publication No. 2001-0049229, Utility Model Registration No. 20-0247890 and Utility Model Registration No. 20-0249955, and fixing flowers in various ways and covering the sealed bags for a long time. As it uses the inert gas such as argon or nitrogen gas, which is a protective gas, it is not only limited to sealing the protective gas with an airtight bag. It is difficult to maintain the freshness for a long time, there is a limit, there is a problem that the buyers have a rejection reaction by injecting inert gas.

In another related art, Patent Registration No. 0024804 describes carbon dioxide gas at 27 ° C. as a packaging material for forming the storage atmosphere, focusing on controlling not only carbon dioxide but also oxygen in order to maintain freshness of fruits and vegetables. In consideration of permeation coefficient, oxygen permeation coefficient and water vapor permeability coefficient, this paper proposes a synthetic resin film that can control the amount of these gases present in the packaging container. There is a limit to effectively maintain the freshness for a long time because it does not have a function to remove.

Generally, various agricultural products such as domestic or foreign fruits, vegetables or flowers are cultivated in cultivated farms and passed to various consumers through various distribution stages. As a result, long-term exposure to the outside has caused a lot of corruption or damage in the distribution process, which can eventually be disposed of, resulting in unnecessary waste of resources, leading to enormous foreign currency waste not only for distributors but also for the whole country. When delivered to the freshness had a problem such as the case that the freshness can not eat the best quality agricultural products.

Recently, a sterilization method using a low temperature plasma apparatus has been studied. As a low temperature plasma, one Atmospheric-pressure Uniform Glow Discharge Plasma, Dielectric Barrier Discharge, Corona Discharge, Resistor Barrier Discharge ( Resistive Barrier Discharge, Surface-wave plasma using 2.45 GHz microwave, and Atmospheric Pressure Plasma Jet (APPJ) have been studied.

In particular, the U.S. Patent US 5,961,772, atmospheric pressure plasma jet (APPJ), registered in 1999 by the Los Alamos Institute in the United States, generates plasma in a coaxial cylindrical capacitor reactor by a 13.56 MHz radio frequency power supply, It is a device that releases intensive and reactive chemical species out of the reactor by gas flow. This plasma is formed at atmospheric pressure, low temperature and uniform glow discharge, it has a relatively effective sterilization effect than the previously studied plasma devices, and has the feature of avoiding spatial constraints.

The above-mentioned atmospheric plasma apparatus and atmospheric plasma jet (APPJ) have generally used helium gas as the main raw material. This is because the atmospheric pressure discharge using helium gas has a low discharge voltage and can maintain a stable glow discharge even if it contains a gas having a strong electron affinity such as oxygen. However, conventional atmospheric plasma jet (APPJ) using helium gas consumes more than 90 liters per minute (lpm) and a lot of power (more than 300 W) for effective sterilization, and the plasma flame temperature of 150 degrees Celsius There was a problem causing thermal damage to the treated object such as.

In addition, since the plasma generated by the plasma generator directly irradiates and sterilizes the microorganisms, the size of the plasma generator has to be increased for more effective sterilization.

Accordingly, the present inventors have made diligent efforts to solve the above problems, and when using the plasma injector having a plasma induction module having a distance between the electrode and the ground of 0.5 to 1.0 mm, the size of the plasma injector can be made compact, When the compact plasma injector is mounted in a refrigeration system, in addition to the sterilization effect by the plasma itself, the plasma decomposes ethylene gas generated from agricultural products to ethylene oxide and ethylene glycol, and the converted ethylene oxide or ethylene glycol By sterilizing the microorganisms remaining in the agricultural products, it was confirmed that the freshness of the agricultural products can be maintained for a long time, thereby completing the present invention.

An object of the present invention is to generate a plasma to act directly on the microorganisms on the surface of the agricultural products or to decompose ethylene gas, which is a ripening gas, to extend the freshness of agricultural products, including fruits, flowers and vegetables, and to inhibit decay, By sterilizing the microorganisms on the surface of the agricultural products by using, the atmospheric plasma spray device for sterilization and storage of agricultural products which can prevent the contamination of agricultural products, the agricultural products sterilization and storage device equipped with the atmospheric plasma spraying device and the agricultural products using them To provide a treatment method of.

Another object of the present invention relates to a method for removing chemical harmful substances present in agricultural products by using an atmospheric plasma spray device for agricultural product sterilization and storage.

In order to achieve the above object, the present invention provides an atmospheric pressure plasma spray device for agricultural products sterilization and storage, including a plasma induction module, a gas supply unit and a power supply unit having a distance between the electrode and the ground of 0.5 to 1.0 mm.

The present invention also characterized in that sterilization or storage of agricultural products using an atmospheric plasma spraying device for sterilizing and storing agricultural products including a plasma induction module, a gas supply unit and a power supply unit having a distance between the electrode and the ground of 0.5 to 1.0 mm. Provide a method for the processing of agricultural products.

The present invention also provides a chemical hazardous substance present in agricultural products, characterized by using an atmospheric plasma spraying device for sterilizing and storing agricultural products including a plasma induction module having a distance between the electrode and the ground of 0.5 to 1.0 mm, a gas supply unit, and a power supply unit. Provides a way to remove it.

The present invention also provides a sterilization and storage of agricultural products comprising a plasma induction module having a distance between the electrode and the ground of 0.5 mm to 1.0 mm, a gas supply unit and a power supply unit. Provide a device.

In the present invention, the agricultural product sterilization-storage atmospheric plasma spraying apparatus is characterized in that the plasma generated by the atmospheric plasma spraying apparatus sterilizes microorganisms on the surface of the agricultural products.

In the present invention, the agricultural product sterilization and storage atmospheric plasma spray device is a plasma generated by the atmospheric pressure plasma spray device remaining in the agricultural products stored by using ethylene oxide or ethylene glycol generated by decomposition of ethylene gas generated from the agricultural products Sterilize microorganisms and remove residual pesticides as a kind of harmful substances.

In the present invention, the produce is characterized in that the fruit, flowers or vegetables that generate ethylene gas.

In the present invention, the agricultural product sterilization and storage atmospheric pressure plasma spraying device is characterized in that one or more plasma induction module is mounted.

In the present invention, the gas supply unit is one selected from the group consisting of argon (Ar), oxygen (O 2 ), nitrogen (N 2 ), water vapor (H 2 O), carbon dioxide (CO 2 ), air (Air). The above gas is supplied.

In the present invention, the power supply is characterized in that for applying a 3.0 ~ 6.0 kV voltage and 50 ~ 250 W power.

By using the atmospheric plasma spray device for sterilizing and storing agricultural products according to the present invention, the sterilization and the decomposition of harmful substances can be efficiently performed. Can be. In addition, since the plasma induction module of the agricultural product sterilization and storage of the atmospheric pressure plasma injector is disposed in a form in which the electrodes are in close contact with the ground, and is compact, it is mounted on a conventional agricultural product sterilizer and storage device (or refrigeration equipment). It is possible to maximize the effect by adjusting the number of modules according to the application environment.

1 is a block diagram of an atmospheric pressure plasma spray apparatus for sterilizing and storing agricultural products according to an embodiment of the present invention.
Fig. 2 is a photograph comparing the state in which the atmospheric plasma spraying device is operated and not while the banana is stored in the agricultural product sterilization and storage device equipped with the atmospheric plasma spraying device of the present invention. One-time plasma sprayer)
Figure 3 is a graph measuring the number of microorganisms present in the banana after operating the atmospheric plasma injector, while storing the banana in the agricultural product sterilization and storage device equipped with the atmospheric pressure plasma injector of the present invention.
Figure 4 is a graph measuring the sterilization effect of E. coli over time at power of 100W, 150W and 200W by the agricultural product sterilization and storage atmospheric plasma spray apparatus according to an embodiment of the present invention.
5 to 7 is a graph showing the sterilizing power against E. coli of the agricultural product sterilization and storage of the atmospheric pressure plasma spray apparatus according to an embodiment of the present invention. (Distance of the nozzle of the plasma induction module: 5.6cm, power supply voltage: 3.7 kV, air flow rate: 2 L / min, 3 L / min and 5 L / min respectively).
8 to 10 is a graph showing the sterilizing power for E. coli of the agricultural product sterilization and storage of the atmospheric pressure plasma injector according to an embodiment of the present invention. kV, air flow rate: 2 L / min, 3 L / min and 5 L / min respectively).
11 to 13 are graphs showing the sterilizing power against E. coli of the agricultural product sterilization and storage of the atmospheric pressure plasma spray apparatus according to an embodiment of the present invention. (Distance from the nozzle of the plasma induction module: 5.6cm, power supply voltage: 4.3 kV, air flow rate: 2 L / min, 3 L / min and 5 L / min respectively).
14 to 16 is a graph showing the sterilizing power for E. coli of the agricultural product sterilization and storage device equipped with an atmospheric pressure plasma spray device according to an embodiment of the present invention. (Distance from the nozzle of the plasma induction module: 28cm, power supply Supply voltage: 4.0 kV, air flow rate: 5 L / min, refrigeration volume: 20L, 86L and 110L, respectively.
17 is a graph measuring the sterilization effect of Salmonella over time by power of 100, 150, 200 W by the sterilization and storage of atmospheric plasma spraying apparatus according to an embodiment of the present invention.
18 to 20 are graphs showing the sterilizing power of Salmonella of the agricultural products sterilization and storage device equipped with an atmospheric pressure plasma spray device according to an embodiment of the present invention. (Distance from the nozzle of the plasma induction module: 28 cm, power supply Supply voltage: 4.0 kV, air flow rate: 5 L / min, refrigeration volume: 20L, 86L and 110L, respectively.
21 to 23 is a graph showing the bactericidal power against Bacillus bacteria of agricultural products sterilization and storage device equipped with an atmospheric plasma spray device according to an embodiment of the present invention. (Distance from the nozzle of the plasma induction module: 28cm, Power supply voltage: 4.0 kV, air flow rate: 5 L / min, refrigeration plant volumes: 20L, 86L and 110L, respectively.
24 to 26 is a graph showing the sterilizing power against staphylococcus aureus of the agricultural product sterilization and storage device equipped with an atmospheric pressure plasma spray device according to an embodiment of the present invention. (Distance of the plasma induction module: 28cm, Power supply voltage: 4.0 kV, air flow rate: 5 L / min, refrigeration plant volumes: 20L, 86L and 110L, respectively.
Figure 27 is a graph confirming the sterilization effect after treating the plasma to strawberries using an atmospheric plasma spray device for sterilization and storage of agricultural products according to the speed of the conveyor belt.
28 is a graph showing the plasma removal effect on the pesticide on the apple surface stored in the agricultural product sterilization and storage device equipped with an atmospheric pressure plasma spray apparatus according to an embodiment of the present invention.

In the present invention, when using an atmospheric pressure plasma injector including a plasma induction module having a distance between the electrode and the ground 0.5 to 1.0 mm, the size of the plasma injector can be made compact, and the compact plasma injector is mounted in a refrigerating facility. In this case, the plasma acts directly on the microorganisms on the surface of the produce or decomposes the ethylene gas generated in the produce to ethylene oxide and ethylene glycol, and the converted ethylene oxide or ethylene glycol sterilizes the microorganisms remaining in the produce. It was intended to confirm that the freshness can be maintained for a long time.

In one embodiment of the present invention, by producing an atmospheric plasma spraying device for sterilization and storage of agricultural products comprising a plasma induction module, a gas supply unit and a power supply unit having a distance between the electrode and the ground is 0.5 ~ 1.0 mm, and mounted in a refrigeration facility Plasma generation was induced while storing the banana in the produced agricultural product sterilization and storage device. As a result, when the plasma was induced, it was confirmed that the freshness of the banana was maintained for a long time, the microorganisms present in the banana were sterilized and the number of microorganisms was significantly reduced.

Accordingly, the present invention relates to an atmospheric plasma spraying apparatus for sterilizing and storing agricultural products including a plasma induction module, a gas supply part, and a power supply part having a distance between electrodes and grounds of 0.5 to 1.0 mm, and a method of processing agricultural products using the same.

Hereinafter, with reference to the drawings will be described in detail the atmospheric pressure plasma spray device for agricultural products sterilization and storage according to the present invention.

1 is a block diagram of an atmospheric pressure plasma spray apparatus for sterilizing and storing agricultural products according to an embodiment of the present invention.

As shown in Figure 1, the agricultural product sterilization and storage of the atmospheric pressure plasma spray device of the present invention is a plasma induction module 10, the gas supply unit 20 and the power supply unit 30 is 0.5 ~ 1.0 mm between the electrode and ground. It includes.

The plasma induction module 10 can be used without particular limitation if it can generate a plasma, but the electrode is closely attached to the ground (0.5 to 1.0 mm) so that it can be manufactured in a small size and high electron even at a low voltage It is preferable to use what can generate a density.

When the distance between the electrode and the ground is 0.5 to 1.0 mm, the thickness of the plasma induction module becomes very thin, so that the plasma induction module can be easily attached to an atmospheric plasma spray device for sterilizing and storing agricultural products. Therefore, it is possible to efficiently sterilize microorganisms and decompose harmful substances.

The electrode may be made of a conductor made of copper, silver, platinum, stainless rod, or other material. The electrode may be coated with a dielectric of a resin such as silicon, polyimide, and epoxy to a thickness of about 5 μm to 1 mm. . At this time, the thinner the coating thickness, the lower the output voltage to improve the efficiency, but less than 5 μm, there is a problem that the durability is poor, the efficiency is greatly reduced at 1 mm or more, so this range is preferable. In addition, when the electrode is a circular wire, the diameter is preferably 0.1 to 5 cm, but may be changed according to the size of the entire module.

The agricultural product sterilization and storage atmospheric pressure plasma injector 100 may include one or more plasma induction module 10, the size and storage of the refrigeration equipment equipped with the agricultural plasma sterilization and storage atmospheric pressure plasma injector 100. Depending on the number of containers, the number of plasma induction modules can be arbitrarily selected and adjusted.

The gas supply unit 20 is at least one gas selected from the group consisting of argon (Ar), oxygen (O 2 ), nitrogen (N 2 ), water vapor (H 2 O), carbon dioxide (CO 2 ), air (Air) It characterized in that the supply. The gas supply unit 20 may include a compressor and a mass flow controller (MFC), and are separately installed in the atmospheric plasma spray device 100 for sterilizing and storing agricultural products. It may be mounted integrally.

The power supply unit 30 is for supplying power between the electrode and the ground, but may supply power within a normal range, but the distance between the electrode and the ground constituting the plasma induction module is 0.5 to 1.0 mm. It is desirable to apply 3.0-6.0 kV voltage or 50-250 W power lower than the usual applied voltage or applied power. In general, the lower the applied voltage is advantageous in terms of power efficiency, but at 3.0 kV or less, the applied voltage is too low, and the plasma generation may be extremely weak.

In addition, pulse, sine wave, DC power can be used as the power supply of the power supply unit 30, but the most stable result can be obtained when AC voltage is applied. Is preferred.

The atmospheric plasma spraying apparatus 100 for sterilizing and storing agricultural products may further include a touch panel and a programmable logic controller (PLC) which are typically used to control the apparatus.

The atmospheric plasma spray device for sterilizing and storing agricultural products may be used on a conveyor belt when packaging and distributing agricultural products when used as an open type, and may be used after being mounted inside a refrigeration facility when used as a sealed type.

Therefore, the present invention relates to an apparatus for sterilizing and storing agricultural products and a method of treating agricultural products using the same, wherein the agricultural product is sterilized and stored.

In the present invention, the agricultural product sterilization-storage atmospheric pressure plasma injector 100 is an ethylene oxide generated by the plasma generated by the atmospheric pressure plasma injector acts directly on the microorganisms on the surface of the produce or decomposes the ethylene gas generated in the produce Or sterilizing the microorganisms remaining in the agricultural products stored in ethylene glycol.

The agricultural products are not particularly limited in kind, but can be stored more effectively if the fruit, flower or vegetable that generates ethylene gas. The agricultural products may include not only primary production agricultural products but also secondary processing agricultural products and natural additives.

Sterilizing microorganisms remaining in the agricultural products stored in ethylene oxide or ethylene glycol generated by decomposition of ethylene gas (ethylene; C 2 H 4 ) generated by the plasma generated from the agricultural products sterilization and storage atmospheric plasma spray device for sterilization The mechanism is described in detail as follows.

When plasma is generated in the plasma induction module 10 of the atmospheric sterilization and storage of the plasma spray device, ions, electrons, active radicals, ozone, and the like are generated in the plasma generation region.

In the plasma region, water molecules or oxygen molecules generate electrons by the reaction formula (1), and activating radicals such as OH * and O * are generated, and ethylene gas (ethylene; C 2 H 4 ) is oxidized by the activation radicals. As oxalic acid (HOOC-COOH) via ethylene oxide (C 2 H 4 O) or ethylene glycol (OH-C 2 H 4 -OH) as shown in schemes (2) and (3) Is oxidized.

O 2 + H 2 O + e - → OH * + O * -------------------------- (1)

Ethylene (C 2 H 4 ) + O * → Ethylene oxide (C 2 H 4 O) + 4O * → Oxalic acid (HOOC-COOH) + H 2 O + O * → 2H 2 O + 2CO 2 ----- ------ (2)

Ethylene (C 2 H 4 ) + 2OH * → Ethylene glycol (OH-C 2 H 4 -OH) + 4O * → Oxalic acid (HOOC-COOH) + 2H 2 O + O * → 3H 2 O + 2CO 2- -(3)

It is well known that ethylene oxide (C 2 H 4 O) or ethylene glycol (ethylene glycol; OH-C 2 H 4 -OH) has a bactericidal effect (Gilbert et al. , Appl. Microbiol. , 12: 496-503, 1964; Robertson, OH, Am. J. Med., 7: 293-296, 1949). Ethylene oxide gas is widely used in various processes for dry sterilization, and ethylene glycol is also used in various antimicrobial membrane processes for the antiviral effect and antibacterial effect.

In addition, the plasma generated by the atmospheric plasma spray device for sterilization and storage of agricultural products may decompose harmful substances remaining in the agricultural products. For example, decomposition of the pesticide chloropyrifos (C 9 H 11 Cl 3 NO 3 PS) can be made by the following reaction formula. That is, when water molecules or oxygen molecules in the plasma region generate activating radicals such as OH * and O * at the same time as electrons are generated by the reaction formula (1), the radicals pass through the following reaction formulas (4) and (5) It oxidizes and decomposes substances (e.g. chloropyrifos pesticides, chloropyrifos) into carbon dioxide and water molecules, which are harmless to the human body.

OH * + C 9 H 11 Cl 3 NO 3 PS → C 9 H 9 * Cl 3 NO 3 PS + 2H 2 O ----------- (4)

C 9 H 9 * Cl 3 NO 3 PS + 9O 2 + 9OH * → 9CO 2 + 10H 2 O + NO 3 PS --- (5)

Such a reaction is not limited to chloropyriphos but is a reaction corresponding to various organic compound molecules, and all of them undergo an oxidation-induced process to decompose.

Therefore, in another aspect, the present invention exists in agricultural products, characterized in that using a plasma induction module having a spacing between the electrode and the ground 0.5 ~ 1.0 mm, using a atmospheric pressure plasma spray device for sterilization and storage of agricultural products comprising a gas supply and a power supply. It relates to a method for removing chemical harmful substances.

The atmospheric pressure plasma spray apparatus for sterilizing and storing agricultural products can control the frequency and time of generating the plasma. The generation frequency and time of the plasma may vary depending on the type, shape and size of agricultural products stored, but is preferably repeated at least 5 seconds at least 10 times a day.

Hereinafter, the present invention will be described in more detail with reference to Examples. It is to be understood by those skilled in the art that these embodiments are only for illustrating the present invention and that the scope of the present invention is not construed as being limited by these embodiments.

Example 1: Fabrication of atmospheric plasma spray device for sterilization and storage of agricultural products

Plasma induction module (330 mm wide, 68.5 mm wide, 84 mm wide, electrode: copper, dielectric: glass) with a distance of about 1 mm between the electrode and the ground, and a gas supply unit for supplying gas and power. A low noise air compressor was used to inject the gas necessary for general air) and plasma induction, and an MFC module variable from 1 to 30 lpm was used to accurately control the flow rate. The power supply unit (RF generator; applied voltage 3.0 ~ 6.0 kV and power ~ 200 W) used an induction device with a maximum output of 2 kW to induce stable plasma. One or two plasma induction modules were mounted on each side. At this time, each step is controlled automatically and the user's convenience is enhanced by the control through the PLC and the installation of the touch panel so that it can operate in the optimal environment.

Example 2: Confirming Freshness of Fruits by Plasma Induction

In this embodiment, although the freshness was confirmed and the sterilizing power was examined for ethylene gas-sensitive bananas, the same result was obtained even when using other fruits or vegetables exhibiting the aging effect by ethylene gas other than the gist of the present invention. Being is obvious to those of ordinary skill in this field.

The apparatus for sterilization and storage of agricultural products prepared in Example 1 was mounted inside a refrigeration facility to produce agricultural products for sterilization and storage, and then the bananas were stored and the control group harvested bananas at the same time. Stored inside a refrigeration plant of the same type. In this case, in order to prevent plasma from directly acting on the surface of the banana, a direct blocking film was installed inside the refrigerating facility to induce decomposition of ethylene gas.

After generating plasma 12 times a day for 10 seconds using 100W of power for 10 days, the state of the banana was confirmed, and the results are shown in FIG. 2.

As shown in FIG. 2, the freshness of bananas compared to the control in the case of the bananas stored in the agricultural product sterilization and storage device manufactured by mounting the atmospheric plasma spraying device for sterilization and storage produced in Example 1 inside a refrigeration facility. It was confirmed that it is maintained for a long time. That is, in the above experiment, the plasma was sprayed into the refrigeration facility in which the bananas were stored, and the effect of increasing the freshness of the bananas while decomposing ethylene gas, which is a mature gas, was confirmed.

Figure 3 is a graph measuring the number of microorganisms present in the banana while the banana is stored after operating the atmospheric plasma spray device of the agricultural product sterilization and storage device equipped with an atmospheric plasma spray device. In this case, in order to prevent plasma from directly acting on the surface of the banana, a direct blocking film was installed inside the refrigerating facility to induce decomposition of ethylene gas.

Plasma was generated by varying the plasma injection time (0 sec, 5 sec, 10 sec, 15 sec, and 20 sec) using 100 W of power, respectively. As the plasma injection time increased, the number of microorganisms residing on the banana surface increased. Was found to decrease.

As shown in FIG. 3, it was confirmed that more than 95% of the microorganisms on the banana surface disappeared in the banana sample after the plasma was sprayed for 15 seconds or more.

In the experiment, the plasma is injected into the agricultural product sterilization and storage device equipped with an atmospheric plasma spray device, and the ethylene gas, which is a mature gas, is converted into ethylene oxide gas or ethylene glycol, which shows sterilization effect and shows sterilization effect. there was.

Example 3: Analysis of bactericidal effect on E. coli

Example 3-1 Using an Atmospheric Pressure Plasma Injection Apparatus for Sterilizing and Storing Agricultural Products

E. coli ( Escherichia coli ) (Korea Microbial Resources Center, KCTC1041) was plated 3.3 × 10 9 CFU on Luri-Bertani Agar, and then the atmospheric plasma spray device for sterilization and storage of agricultural products prepared in Example 1 Plasma was sprayed at a distance of about 5 cm from the nozzle of the plasma induction module. The sterilization rate (%) was confirmed by time using the output of 100, 150, and 200 W, respectively, and the result is shown in FIG.

As shown in FIG. 4, even when only 10 seconds of plasma injection, the bactericidal power of about 90% or more was confirmed.

The results are shown by summing the results confirmed from the angle of 48 ° to the angle range of 107 ° from the nozzle of the plasma induction module. Therefore, in order to show sterilization power within a short time, it is preferable to spray within 48 °, but in the case of the periodic spraying method, it shows more than 90% sterilization power even in the angle range of 107 °. have.

In addition, E. coli ( E. coli ) (Korea Microorganism Resource Center, KCTC1041) was plated 3.3 × 10 9 CFU in a flat plate medium (Luria-Bertani Agar), and then atmospheric plasma spraying for sterilization and storage of agricultural products prepared in Example 1 Plasma was sprayed at a distance of about 5.6 cm from the nozzle of the plasma induction module of the apparatus. At this time, the power of the generator was fixed at 3.7 kV and the air flow rate was set at 2 L / min, 3 L / min and 5 L / min, respectively, and the results are shown in FIGS. 5 to 7.

As shown in Figures 5-7, when the flow rate of air is 2 L / min, when the sterilization time is treated for 60 seconds or more showed a sterilization effect of more than 80% (Fig. 5), the flow rate of air is 3 L / In the case of min, when the sterilization time was treated for 20 seconds or more, the sterilization effect was over 80% (Fig. 6), and when the flow rate of air was 5 L / min, when the sterilization time was treated for 20 seconds or more, The bactericidal effect (FIG. 7) was shown.

In addition, E. coli ( E. coli ) (Korea Microorganism Resource Center, KCTC1041) was plated 3.3 × 10 9 CFU in a flat plate medium (Luria-Bertani Agar), and then atmospheric plasma spraying for sterilization and storage of agricultural products prepared in Example 1 Plasma was sprayed at a distance of about 5.6 cm from the nozzle of the plasma induction module of the apparatus. At this time, the power of the generator was fixed at 4.0 kV, and the air flow rates were 2 L / min, 3 L / min and 5 L / min, respectively, and the results are shown in FIGS. 8 to 10.

As shown in Figures 8 to 10, when the flow rate of the air is 2 L / min, the sterilization effect of more than 80% when the sterilization time is treated for 60 seconds or more (Fig. 8), the flow rate of air is 3 L / In the case of min, when the sterilization time was treated for 30 seconds or more, the sterilization effect was nearly 100% (Fig. 9). It showed a sterilizing effect close to% (Fig. 10).

In addition, E. coli ( E. coli ) (Korea Microorganism Resource Center, KCTC1041) was plated 3.3 × 10 9 CFU in a flat plate medium (Luria-Bertani Agar), and then atmospheric plasma spraying for sterilization and storage of agricultural products prepared in Example 1 Plasma was sprayed at a distance of about 5.6 cm from the nozzle of the plasma induction module of the apparatus. At this time, the power of the generator was fixed at 4.3 kV, and the air flow rates were 2 L / min, 3 L / min and 5 L / min, respectively, and the results are shown in FIGS. 11 to 13.

11 to 13, when the flow rate of air is 2 L / min, when the sterilization time is treated for 60 seconds or more showed about 80% sterilization effect (Fig. 11), the flow rate of air is 3 L In the case of / min, the sterilization time of more than 90 seconds showed more than 80% sterilization effect (Fig. 12), the air flow rate of 5 L / min, 90% when the sterilization time is treated for 30 seconds or more The above bactericidal effect was shown (FIG. 13).

Example 3-2 Using a device for sterilizing and storing agricultural products equipped with an atmospheric pressure plasma spray device

The apparatus for sterilizing and storing agricultural products equipped with an atmospheric pressure plasma spraying apparatus was mounted by mounting the atmospheric plasma spraying apparatus for sterilizing and storing agricultural products prepared in Example 1 inside a refrigeration facility of 20L, 86L and 110L, respectively, (ESherichia coli ) (Korea Microbial Resources Center, KCTC1041) was plated with 3.3 × 10 9 CFU on Luri-Bertani Agar, and then plasma was sprayed at a distance of about 28 cm from the nozzle of the plasma induction module. At this time, the power of the generator was fixed at 4.0 kV and the flow rate of air was 5 L / min. The results are shown in FIGS. 14 to 16.

As shown in Figure 14 to 16, when mounted in a refrigeration equipment of 20L volume, when the sterilization time is treated for 20 seconds or more showed a sterilization effect of more than 95% (Fig. 14), when installed in a refrigeration equipment of 86L volume , Sterilization time of more than 95% when the sterilization time is treated for 20 seconds or more (Fig. 15), when the sterilization time is more than 95% when the sterilization time is processed for more than 80 seconds (110) Indicated.

Example 4: Analysis of bactericidal effect on Salmonella

Example 4-1 Using an Atmospheric Pressure Plasma Injector for Sterilizing and Storing Agricultural Products

After smearing 2.98 × 10 9 CFU on Salmonella typhimurium (Korea Microbial Resources Center, KCTC2054) in a mixed flat medium (Luria-Bertani Agar), the atmospheric plasma spray device for sterilizing and storing agricultural products prepared in Example 1 The plasma was sprayed at a distance of about 5.6 cm from the nozzle of the plasma induction module. The sterilization rate (%) was confirmed by time using the output of 100, 150, and 200 W, respectively, and the result is shown in FIG.

As shown in FIG. 17, even when only 10 seconds of plasma was sprayed, it was confirmed that there was about 85% or more germicidal power in the case of 100 W and about 95% or more in the case of 200 W.

As shown in FIGS. 4 to 16, the results are obtained by adding up the results obtained from the plasma induction nozzle from 48 ° to 107 °, and the highest sterilizing power when spraying at an angle within 48 ° is short. In order to show the sterilizing power in time, it is preferable to spray within 48 degrees. However, in the case of the periodic injection method, the sterilizing power is more than 85% even in the angle range of 107 ° so that the plasma induction module can be installed and operated according to the purpose.

Example 4-2: Using a device for sterilizing and storing agricultural products equipped with an atmospheric plasma spray device

After the production of the sterilization and storage of agricultural products equipped with an atmospheric pressure plasma injection device equipped with an atmospheric plasma spraying apparatus for sterilization and storage of agricultural products prepared in Example 1, respectively 20L, 86L and 110L volume, and then the Salmonella The bacteria ( Salmonella typhimurium ) (KCTC2054, Korea Microbial Resources Center) were plated with 2.98 × 10 9 CFU on a flat plate (Luria-Bertani Agar), and plasma was sprayed at a distance of about 28 cm from the nozzle of the plasma induction module. . At this time, the power of the generator was fixed at 4.0 kV and the air flow rate was 5 L / min. The results are shown in FIGS. 18 to 20.

As shown in Fig. 18 to 20, when installed in a refrigeration equipment of 20L volume, when the sterilization time is treated for 10 seconds or more showed more than 90% sterilization effect (Fig. 18), when installed in a refrigeration equipment of 86L volume , Sterilization time of 30 seconds or more showed a close to 100% sterilization effect (Fig. 19), when installed in a refrigeration equipment of 110L volume when sterilization time of 60 seconds or more (100 degrees) 20).

Example 5: Analysis of bactericidal effect on Bacillus

An atmospheric plasma spraying device for sterilizing and storing agricultural products prepared in Example 1 was mounted inside a refrigeration facility having a volume of 20L, 86L, and 110L, respectively, to produce agricultural sterilizing and storage device equipped with an atmospheric plasma spraying device, and then to Gram. Bacillus subtilis (KCTC2217), a positive bacterium, was smeared on a flat plate (Luria-Bertani Agar) at 2.98 × 10 9 CFU, and then plasma was placed at a distance of about 28 cm from the nozzle of the plasma induction module. Sprayed. At this time, the power of the generator was fixed at 4.0 kV and the flow rate of air was 5 L / min. The results are shown in FIGS. 21 to 23.

As shown in Figure 21 ~ 23, when installed in the refrigeration equipment of 20L volume, when the sterilization time is treated for 10 seconds or more showed more than 90% sterilization effect (Fig. 21), when installed in the refrigeration equipment of 86L volume , Sterilization time of more than 90% showed a sterilization effect of more than 90% (Fig. 22), when installed in a refrigeration equipment of 110L volume, sterilization effect of more than 90% when more than 10 seconds of sterilization time (Fig. 23) Indicated.

Example 6: Analysis of bactericidal effect on staphylococci

An atmospheric plasma spraying device for agricultural product sterilization and storage prepared in Example 1 was mounted inside a refrigeration facility of 20L, 86L and 110L, respectively, to produce agricultural sterilization and storage device equipped with an atmospheric plasma spraying device, and then to a greenhouse. Gram-positive bacteria of Staphylococcus aureus of the generated from cultivated strawberry bacteria (Staphylococcus aureus) (Korea microorganism resource Center, KCTC1916), and then a smear of 3.3 × 10 9 CFU in the composite plate medium (Luria-Bertani Agar), plasma-derived Plasma was sprayed at a distance of about 28 cm from the nozzle of the module. At this time, the power of the generator was fixed at 4.0 kV and the flow rate of air was 5 L / min. The results are shown in FIGS. 24 to 26.

As shown in Figures 24 to 26, when installed in a refrigeration equipment of 20L volume, when the sterilization time is treated for 90 seconds or more showed a sterilization effect of more than 90% (Fig. 24), when installed in a refrigeration equipment of 86L volume , Sterilization time of more than 90% showed a sterilization effect of more than 90% (Fig. 25), when installed in a refrigeration equipment of 110L volume, sterilization effect of more than 90% when more than 90 seconds of sterilization time (Fig. 26) Indicated.

Example 7 Where Real Strawberry Packaging Work is Made Plasma Sterilization Effect

Atmospheric pressure plasma spray device for agricultural products sterilization and storage produced in Example 1 was installed where the strawberry packaging operation of the Greenhouse Crop Research Institute in Damyang, Jeonnam. The generator power is 4.0 kV and the air flow rate is fixed at 5 L / min, and then the plasma is processed according to the speed of the conveyor belts (0.84, 2.62, 4.24, 6.04, 9.40, 15.17 cm / sec) to pack the strawberries. The bactericidal power was tested.

Samples washed before and after the plasma treatment with sterile water incubated for 24 hours at 37 ℃ in a mixed medium to confirm the bacterial count (CFU / ml), the results are shown in Figure 27.

As shown in FIG. 27, the sample not treated with plasma showed about 80 CFU / ml, while the sample treated with plasma showed high sterilizing power of 95% or higher regardless of the time of irradiation of the plasma.

In the present embodiment, the bactericidal power of E. coli, Salmonella, Bacillus, Staphylococcus was examined, but the same result can be obtained even if the bacterium is used for bacteria other than the gist of the present invention. It is obvious to him.

Example 8: Plasma is inserted into the refrigerator to remove harmful substances

An atmospheric plasma spray device for sterilizing and storing agricultural products prepared in Example 1 was mounted in a 110L refrigerator, and then apples treated with pesticides (0 ppm, 0.1 ppm, and 10 ppm) by concentration (0 ppm, 0.1 ppm, and 10 ppm) were placed in the refrigerator. Thereafter, the generator power was 4.0 kV, and the air flow rate was 5 L / min for 60 seconds, followed by quantitative measurement of the residual pesticide through the amount of current generated by the electrochemical method, and the results are shown in FIG. 28.

As shown in FIG. 28, it was confirmed that the pesticides of 15 to 20% were reduced even by the plasma treatment for 60 seconds compared to the sample without the plasma treatment.

While the present invention has been particularly shown and described with reference to specific embodiments thereof, those skilled in the art will readily appreciate that many modifications are possible in the exemplary embodiments without materially departing from the novel teachings and advantages of this invention. something to do. Accordingly, the actual scope of the present invention will be defined by the appended claims and their equivalents.

10: plasma induction module
20: gas supply
30: power supply

Claims (15)

Atmospheric pressure plasma spraying apparatus for sterilizing and storing agricultural products including a plasma induction module, a gas supply unit, and a power supply unit having a distance between electrodes and grounds of 0.5 to 1.0 mm.
According to claim 1, Atmospheric pressure plasma spraying apparatus for sterilization and storage of agricultural products, characterized in that the plasma generated by the plasma spray device sterilize microorganisms on the surface of the agricultural products.
The agricultural product of claim 1, wherein the plasma generated by the atmospheric pressure plasma injector sterilizes microorganisms remaining in the stored product using ethylene oxide or ethylene glycol generated by decomposing ethylene gas generated from agricultural products. Atmospheric pressure plasma sprayer for sterilization and storage.
[Claim 2] The atmospheric plasma spraying apparatus of claim 1, wherein the agricultural product is a fruit, a flower, or a vegetable that generates ethylene gas.
The atmospheric pressure plasma injector for agricultural product sterilization and storage according to claim 1, wherein the agricultural product sterilization and storage atmospheric pressure plasma injector is equipped with at least one plasma induction module.
The gas supply unit of claim 1, wherein the gas supply unit is selected from the group consisting of argon (Ar), oxygen (O 2 ), nitrogen (N 2 ), water vapor (H 2 O), carbon dioxide (CO 2 ), and air (Air). Atmospheric pressure plasma injector for sterilizing and storing agricultural products, characterized in that one or more gases are supplied.
The apparatus of claim 1, wherein the power supply unit applies a 3.0 to 6.0 kV voltage and 50 to 250 W power.
A method for processing agricultural products, characterized in that the agricultural products are sterilized or stored using an atmospheric plasma spraying device for sterilizing and storing agricultural products including a plasma induction module having a distance between the electrode and the ground of 0.5 to 1.0 mm, a gas supply unit, and a power supply unit.
The method of claim 8, wherein the agricultural product sterilization and storage atmospheric pressure plasma injector is a plasma generated by the atmospheric pressure plasma injector to remain in the agricultural product stored in ethylene oxide or ethylene glycol generated by decomposition of the ethylene gas generated from the agricultural products A method for processing agricultural products, characterized in that the microorganisms are sterilized.
The method of claim 8, wherein the produce is a fruit, a flower, or a vegetable that generates ethylene gas.
The method of claim 8, wherein the agricultural product sterilization-storage atmospheric pressure plasma injector is equipped with at least one plasma induction module.
The gas supply unit of claim 8, wherein the gas supply unit is selected from the group consisting of argon (Ar), oxygen (O 2 ), nitrogen (N 2 ), water vapor (H 2 O), carbon dioxide (CO 2 ), and air. A method of processing agricultural products, characterized in that to supply at least one gas.
The method of claim 8, wherein the power supply unit applies a voltage of 3.0 to 6.0 kV and 50 to 250 W of power.
A method for removing chemical harmful substances present in agricultural products, comprising using an atmospheric plasma spraying device for sterilizing and storing agricultural products including a plasma induction module having a distance between an electrode and a ground of 0.5 to 1.0 mm, a gas supply part, and a power supply part.
An apparatus for sterilizing and storing agricultural products, characterized in that an atmospheric pressure plasma spraying device for agricultural products sterilization and storage including a plasma induction module having a distance between the electrode and the ground of 0.5 to 1.0 mm, a gas supply unit, and a power supply unit is mounted.
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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20140124592A (en) * 2013-04-17 2014-10-27 코웨이 주식회사 Air sterilization cleaning device
KR20210033654A (en) 2019-09-19 2021-03-29 울산광역시 Method for preventing stain of peel of pear

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20140124592A (en) * 2013-04-17 2014-10-27 코웨이 주식회사 Air sterilization cleaning device
KR20210033654A (en) 2019-09-19 2021-03-29 울산광역시 Method for preventing stain of peel of pear

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