A device and method for preparing low-temperature plasma-activated water

Abstract

The application discloses a kind of low-temperature plasma activated water preparation device and method, it is related to plasma activated water preparation technical field, including transparent liquid storage tank, it is equipped with first liquid inlet, first liquid outlet and gas outlet on it;Preparation unit contains combination sheet, second electrode sheet and rectangular cylindrical insulating transparent wall, combination sheet is sequentially first dielectric sheet, first electrode sheet and second dielectric sheet from top to bottom, first chamber is formed between them, and is communicated by connecting pipe etc.It can also be equipped with cooling unit, containing radiator, water pump and heat-absorbing water tank etc.The method of the application is to liquid injection tank, after gas injection unit is opened to first chamber alternating current power, plasma is formed by ionizing air, realize direct and indirect activation to liquid.The device and method can improve activation efficiency, increase active substance concentration, and cooling unit can stabilize ionization work, reduce active ingredient loss, with significant advantages.

Description

Technical Field

[0001] This invention relates to the field of plasma-activated water preparation technology, and in particular to a low-temperature plasma-activated water preparation apparatus and method. Background Technology

[0002] Low-temperature plasma-activated water, as a solution rich in complex active substances including ozone, hydroxyl radicals, and hydrogen peroxide, exhibits broad-spectrum bactericidal capabilities against bacteria and microorganisms. This technology boasts high sterilization efficiency, minimal impact on food quality, and is environmentally friendly with no residue, offering significant advantages. In the food industry, spraying or soaking food with plasma-activated water can effectively reduce the colony count of pathogenic microorganisms such as E. coli and Salmonella, thereby extending the shelf life of food and demonstrating broad application prospects.

[0003] However, existing technologies for preparing plasma-activated water have many shortcomings. Direct water treatment techniques, such as surface jet and dielectric barrier discharge, suffer from small activation areas, lack of water flow, and limited activation volume. While indirect treatment techniques offer the advantage of larger activation volumes, techniques like underwater single-dielectric quartz tube discharge suffer from low activation efficiency due to the inability of the plasma to directly contact the water, resulting in significant loss of active components. Furthermore, traditional underwater plasma discharge technology relies excessively on localized plasma excitation, hindering the treatment of other parts of the water. This limitation, particularly in large-scale water treatment applications, prevents the achievement of uniform and efficient water treatment, severely restricting the large-scale application and promotion of low-temperature plasma-activated water technology. Summary of the Invention

[0004] The purpose of this invention is to provide a low-temperature plasma activated water preparation apparatus and method to solve the problems existing in the prior art and improve the preparation efficiency of low-temperature plasma activated water.

[0005] To achieve the above objectives, the present invention provides the following solution:

[0006] This invention provides a low-temperature plasma activated water preparation apparatus, comprising:

[0007] A liquid storage tank, the liquid storage tank being transparent, and the liquid storage tank being provided with a first liquid inlet, a first liquid outlet, and a gas outlet;

[0008] The fabrication unit includes an assembly sheet, a second electrode sheet, and a surrounding wall. The assembly sheet comprises a first dielectric sheet, a first electrode sheet, and a second dielectric sheet, which are sequentially bonded together from top to bottom. The edges of the first dielectric sheet and the second dielectric sheet are both further outward than the edge of the first electrode sheet. The assembly sheet also includes an insulating sealing ring for sealing the edge of the first electrode sheet. The surrounding wall is insulating and transparent. The top end of the surrounding wall is sealed to the bottom surface of the second dielectric sheet, and the bottom end is sealed to the top surface of the second electrode sheet. A first... The first chamber is provided with a plurality of through holes on the second electrode plate communicating with the first chamber, a first vent hole is provided on the surrounding wall, and a second vent hole is provided on the side wall of the liquid storage tank communicating with the first vent hole through a first connecting pipe; the second electrode plate and the surrounding wall are both disposed inside the liquid storage tank; at least one side of the second electrode plate and the combined plate are spaced apart from the inner wall of the liquid storage tank, and the bottom surface of the second electrode plate is spaced apart from the bottom surface of the liquid storage tank; the first electrode plate is electrically connected to the live wire of the AC power supply, and the second electrode plate is electrically connected to the neutral wire of the AC power supply;

[0009] The air injection unit is an air pump, and the air outlet of the air pump is connected to the second vent hole through a second connecting pipe.

[0010] Preferably, it also includes a cooling unit, which includes a radiator disposed outside the liquid storage tank, a water pump disposed outside the liquid storage tank, and a hot water absorption tank disposed inside the liquid storage tank, wherein the hot water absorption tank is sealed and the first medium sheet serves as the bottom plate of the hot water absorption tank;

[0011] The liquid storage tank is provided with a second liquid inlet and a second liquid outlet, and the hot water tank is provided with a third liquid inlet and a third liquid outlet. The liquid outlet of the water pump, the second liquid inlet and the third liquid inlet are connected in sequence. The third liquid outlet, the second liquid outlet and the liquid inlet of the radiator are connected in sequence. The liquid outlet of the radiator is connected to the liquid inlet of the water pump.

[0012] Preferably, both ends of the first medium sheet and the second medium sheet extend out of the liquid storage tank, and the first medium sheet and the second medium sheet are respectively sealed to the liquid storage tank.

[0013] Preferably, the radiator is a finned radiator.

[0014] Preferably, the first dielectric sheet, the first electrode sheet, and the second dielectric sheet are bonded together in sequence, and the first dielectric sheet and the second dielectric sheet are respectively sealed to the insulating sealing ring.

[0015] Preferably, the enclosure wall is in the shape of a rectangular tube.

[0016] Preferably, the first dielectric sheet, the first electrode sheet, the second dielectric sheet, and the second electrode sheet are parallel to each other.

[0017] Preferably, the first vent hole is higher than the second electrode plate.

[0018] Preferably, the first dielectric sheet and the second dielectric sheet are made of quartz or glass; the first electrode sheet and the second electrode sheet are made of aluminum, copper or stainless steel; and the liquid storage tank, the enclosure and the water absorption tank, except for the first dielectric sheet, are all made of acrylic.

[0019] This invention also provides a method for preparing low-temperature plasma activated water. Based on the aforementioned low-temperature plasma activated water preparation device, the liquid to be activated is injected into the storage tank through the first inlet. Then, the air pump is turned on to inject air into the first chamber to completely discharge the liquid in the first chamber and maintain it in a dynamic gas-liquid fluctuation state. The dynamic gas-liquid fluctuation state means that the gas in the first chamber can enter the liquid located in the storage tank and outside the first chamber in the form of bubbles through the through holes on the second electrode plate, causing the liquid located in the storage tank and outside the first chamber to continuously oscillate. During the oscillation process, some liquid can enter the first chamber through the through holes on the second electrode plate. Then, the AC power supply is turned on to form plasma by ionizing the air in the first chamber. The second electrode plate directly activates the liquid entering the first chamber. The plasma-rich gas in the first chamber diffuses into the storage tank and indirectly activates the liquid in the storage tank until highly activated plasma activated water is prepared.

[0020] The present invention achieves the following technical effects compared to the prior art:

[0021] The low-temperature plasma activated water preparation apparatus and method of the present invention can reduce the loss of activating substances and improve activation efficiency by directly activating water in the first chamber, thereby increasing the species composition and concentration in the plasma activated water. During the ionization process, as the gas in the first chamber continuously enters the liquid in the form of bubbles through the through holes on the second electrode plate, a dynamic gas-liquid oscillation interface is formed near the second electrode plate. The existence of the dynamic gas-liquid oscillation interface causes the water to oscillate and enter the first chamber through the through holes on the second electrode plate to participate in the direct activation, thus improving the activation efficiency of all water in the storage tank. Meanwhile, the plasma-rich gas diffuses into the water in the form of bubbles, which can indirectly activate the water located in the storage tank but outside the first chamber. The amount of indirectly activated water is relatively large, which can increase the gas-liquid mixing efficiency and further improve the activation efficiency of all water in the storage tank.

[0022] Furthermore, in this invention, the areas of the first electrode sheet and the second electrode sheet can be set to be relatively large, providing a large area for plasma generation, thereby improving the preparation efficiency.

[0023] Furthermore, the present invention removes the heat generated by the combined plates through the cooling unit, avoiding overheating of the first and second dielectric plates, improving the stability of plasma ionization operation, reducing the temperature of the gas-liquid mixing region, reducing the loss of active ingredients in the plasma-activated water, and helping to lower the temperature of the plasma-activated water and improve the solubility of active substances. Attached Figure Description

[0024] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0025] Figure 1 This is a schematic diagram of the low-temperature plasma activated water preparation device of the present invention;

[0026] Figure 2 This is a partial structural schematic diagram of the low-temperature plasma activated water preparation device of the present invention;

[0027] Figure 3 This is a partial structural schematic diagram of the low-temperature plasma activated water preparation device of the present invention;

[0028] Figure 4 This is a partial structural schematic diagram of the low-temperature plasma activated water preparation device of the present invention;

[0029] In the diagram: 1. Liquid storage tank; 2. First liquid inlet; 3. First liquid outlet; 4. Air outlet; 5. Second liquid inlet; 6. Second liquid outlet; 7. Cable inlet; 8. Hot water tank; 9. Third liquid inlet; 10. Third liquid outlet; 11. First dielectric sheet; 12. Second dielectric sheet; 13. Second electrode sheet; 14. Second vent hole; 15. Through hole; 16. First electrode sheet; 17. First vent hole; 18. Enclosure. Detailed Implementation

[0030] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0031] The purpose of this invention is to provide a low-temperature plasma activated water preparation apparatus and method to solve the problems existing in the prior art and improve the preparation efficiency of low-temperature plasma activated water.

[0032] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0033] Example 1

[0034] like Figures 1 to 4 As shown, this embodiment provides a low-temperature plasma activated water preparation device, comprising:

[0035] The liquid storage tank 1 is transparent and is provided with a first liquid inlet 2, a first liquid outlet 3 and an air outlet 4.

[0036] The fabrication unit includes an assembly sheet, a second electrode sheet 13, and a surrounding wall 18. The assembly sheet includes a first dielectric sheet 11, a first electrode sheet 16, and a second dielectric sheet 12, which are sequentially bonded from top to bottom. The edges of the first dielectric sheet 11 and the second dielectric sheet 12 are both further outward than the edge of the first electrode sheet 16. The assembly sheet also includes an insulating sealing ring (not shown in the figure) for sealing the edge of the first electrode sheet 16. The surrounding wall 18 is insulating and transparent. The top end of the surrounding wall 18 is sealed to the bottom surface of the second dielectric sheet 12, and the bottom end is sealed to the top surface of the second electrode sheet 13. A first chamber is formed between the second dielectric sheet 12, the surrounding wall 18, and the second electrode sheet 13. The second electrode sheet 13 is provided with a plurality of through holes 1 communicating with the first chamber. 5. A first vent 17 is provided on the enclosure 18, and a second vent 14 is provided on the side wall of the liquid storage tank 1 through a first connecting pipe and connected to the first vent 17; the second electrode plate 13 and the enclosure 18 are both located inside the liquid storage tank 1; at least one side of the second electrode plate 13 and the combined plate are spaced apart from the inner wall of the liquid storage tank 1, and the bottom surface of the second electrode plate 13 is spaced apart from the bottom surface of the liquid storage tank 1; the first electrode plate 16 is electrically connected to the live wire of the AC power supply, and the second electrode plate 13 is electrically connected to the neutral wire of the AC power supply. The connecting wire between the second electrode plate 13 and the neutral wire passes through the wire opening 7 on the liquid storage tank 1. It is worth noting that the connecting wire between the second electrode plate 13 and the neutral wire needs to be a waterproof wire.

[0037] The air injection unit uses an air pump, and the air outlet 4 of the air pump is connected to the second vent 14 through the second connecting pipe.

[0038] It is worth noting that the reason why an AC power supply is used instead of a DC power supply in this embodiment is that using a DC power supply would result in a lower efficiency of plasma generation due to the breakdown of the electric field between the first electrode plate 16 and the second electrode plate 13. Using an AC power supply can achieve a higher ionization efficiency, which is beneficial to improving the preparation efficiency of low-temperature plasma activated water.

[0039] The low-temperature plasma activated water preparation device of this embodiment can reduce the loss of activated substances and improve activation efficiency by directly activating water in the first chamber, thereby increasing the species composition and concentration in the plasma activated water. The dynamic gas-liquid wave interface present in the first chamber during ionization helps to renew the directly activated water. The gas discharged from the perforated electrode diffuses into the water in the form of small bubbles to indirectly activate the water, increasing the gas-liquid mixing efficiency and further improving the activation efficiency of the water.

[0040] It should be noted that, in this embodiment, there is a gap between the outer wall of the enclosure 18 and the inner wall of the storage tank 1, so that the liquid in the storage tank 1 can flow to the bottom of the storage tank 1. Secondly, the areas of the first electrode plate 16 and the second electrode plate 13 can be set as large as possible to increase the ionization area and thus improve the preparation efficiency.

[0041] In the optional embodiments of this example, a preferred embodiment further includes a cooling unit. The cooling unit includes a radiator disposed outside the liquid storage tank 1, a water pump disposed outside the liquid storage tank 1, and a hot water absorption tank 8 disposed inside the liquid storage tank 1. The hot water absorption tank 8 is sealed, and the first dielectric sheet 11 serves as the bottom plate of the hot water absorption tank 8. The liquid storage tank 1 is provided with a second liquid inlet 5 and a second liquid outlet 6, and the hot water absorption tank 8 is provided with a third liquid inlet 9 and a third liquid outlet 10. The liquid outlet of the water pump, the second liquid inlet 5, and the third liquid inlet are connected in sequence, and the third liquid outlet 10, the second liquid outlet 6, and the liquid inlet of the radiator are connected in sequence. The liquid outlet of the radiator is connected to the liquid inlet of the water pump. The cooling unit removes the heat generated by the combined plates, preventing the first dielectric sheet 11 and the second dielectric sheet 12 from overheating, improving the stability of plasma ionization, reducing the temperature of the gas-liquid mixing region, reducing the loss of active ingredients in the plasma-activated water, and helping to lower the temperature of the plasma-activated water and improve the solubility of active substances.

[0042] In this embodiment, the sidewall of the hot water absorption tank 8 is integrally formed with the enclosure wall 18. In addition, the first dielectric sheet 11 serves as the bottom plate of the hot water absorption tank 8, that is, the upper surface of the first dielectric sheet 11 serves as the lower surface of the hot water absorption tank 8. This method helps to reduce the heating temperature of the first dielectric sheet 11 and even the combined sheet, and improves the stability of long-term discharge operation.

[0043] In the optional embodiments of this example, it is more preferred that both ends of the first medium sheet 11 and the second medium sheet 12 extend out of the liquid storage tank 1, and the first medium sheet 11 and the second medium sheet 12 are respectively sealed to the liquid storage tank 1. This arrangement allows the first medium sheet 11 and the second medium sheet 12 to be partially located in the liquid in the liquid storage tank 1, dividing the first medium sheet 11 and the second medium sheet 12 into a cooling zone, an ionization activation zone, and a cooling zone, which is beneficial for reducing the temperature of the first medium sheet 11 and the second medium sheet 12.

[0044] In the optional solutions of this embodiment, a finned radiator is preferred. Finned radiators are a mature commercial product with high heat dissipation efficiency.

[0045] In the optional embodiments of this example, it is more preferred that the first dielectric sheet 11, the first electrode sheet 16, and the second dielectric sheet 12 are bonded together in sequence, and the first dielectric sheet 11 and the second dielectric sheet 12 are respectively sealed and connected to the insulating sealing ring; the insulating sealing ring can prevent the liquid in the storage tank 1 from directly contacting the first electrode sheet 16 and causing a short circuit.

[0046] In the optional embodiments of this example, the enclosure 18 is preferably rectangular; however, in practical applications, the enclosure 18 can also be set to a cylindrical shape or other shapes according to actual needs.

[0047] In the optional schemes of this embodiment, it is more preferred that the first dielectric sheet 11, the first electrode sheet 16, the second dielectric sheet 12, and the second electrode sheet 13 are parallel to each other.

[0048] In the optional scheme of this embodiment, it is more preferred that the first vent 17 is higher than the second electrode plate 13, and there are no other gas flow channels in the first chamber, so as to prevent the liquid in the first chamber from directly contacting the second dielectric plate 12, which improves the safety during high voltage discharge and effectively avoids the discharge arcing phenomenon caused by the connection between water and electrode when preparing activated water by underwater discharge.

[0049] In the optional schemes of this embodiment, it is more preferred that the first dielectric sheet 11 and the second dielectric sheet 12 are made of quartz or glass; the first electrode sheet 16 and the second electrode sheet 13 are made of aluminum, copper or stainless steel; and the liquid storage tank 1, the enclosure 18 and the hot water absorption tank 8, except for the first dielectric sheet 11, are all made of acrylic.

[0050] The second electrode plate 13 has an array of through holes 15 on its surface that are in direct contact with the liquid in the storage tank 1. The pores are dynamically filled with water and come into direct contact with the plasma. At the same time, the tiny through holes 15 serve as outlets 4 to quickly blow plasma-activated gas into the gas-liquid mixing area, forming dense and uniform bubbles to improve the gas-liquid mixing efficiency.

[0051] Example 2

[0052] This embodiment provides a method for preparing low-temperature plasma activated water, based on the low-temperature plasma activated water preparation apparatus of Embodiment 1, specifically:

[0053] The liquid to be activated is injected into the storage tank 1 through the first inlet 2. Then, the air pump is turned on to inject air into the first chamber to completely discharge the liquid in the first chamber and maintain it in a dynamic gas-liquid fluctuation state. The dynamic gas-liquid fluctuation state means that the gas in the first chamber can enter the liquid located in the storage tank 1 and outside the first chamber in the form of bubbles through the through hole 15 on the second electrode plate 13, so that the liquid located in the storage tank 1 and outside the first chamber is constantly oscillating. During the oscillation, some liquid can enter the first chamber through the through hole 15 on the second electrode plate 13. Then, the AC power is turned on to form plasma by ionizing the air in the first chamber. The second electrode plate 13 directly activates the liquid entering the first chamber. After the plasma-rich gas in the first chamber diffuses into the storage tank 1, it indirectly activates the liquid in the storage tank 1 until a highly activated plasma-activated water is prepared.

[0054] In the preparation process of the low-temperature plasma activated water preparation method of this embodiment, the direct activation of water in the first chamber can reduce the loss of activating substances and improve the activation efficiency, thereby increasing the species composition and concentration in the plasma activated water. During the ionization process, the gas in the first chamber continuously enters the liquid in the form of bubbles through the through-hole 15 on the second electrode plate 13, resulting in the formation of a dynamic gas-liquid wave interface near the second electrode plate 13 (i.e., an interface in which water can enter the first chamber through the through-hole 15 under dynamic gas-liquid wave conditions). The existence of the dynamic gas-liquid wave interface will cause the water to enter the first chamber through the through-hole 15 on the second electrode plate 13 to participate in the direct activation and be renewed due to the oscillation of the water, thereby improving the activation efficiency of all water in the storage tank 1. The plasma-rich gas diffuses into the water in the form of bubbles, which can indirectly activate the water located in the storage tank 1 but outside the first chamber. The amount of indirectly activated water is large, which can increase the gas-liquid mixing efficiency and further improve the activation efficiency of all water in the storage tank 1.

[0055] The transparent design of the liquid storage tank 1, the enclosure 18, and the hot water absorption tank 8 allows for easy observation of the plasma generated in the first chamber, the mixing state of the plasma gas as it is blown into the water through the through hole 15 on the second electrode plate 13, and whether it is in a dynamic gas-liquid fluctuation state by observing whether a dynamic gas-liquid interface is formed.

[0056] Specific examples have been used to illustrate the principles and implementation methods of this invention. The descriptions of the above embodiments are only for the purpose of helping to understand the method and core ideas of this invention. Furthermore, those skilled in the art will recognize that, based on the ideas of this invention, there will be changes in the specific implementation methods and application scope. Therefore, the content of this specification should not be construed as a limitation of this invention.

Claims

1. A low-temperature plasma activated water preparation device, characterized in that, include: A liquid storage tank, the liquid storage tank being transparent, and the liquid storage tank being provided with a first liquid inlet, a first liquid outlet, and a gas outlet; The fabrication unit includes an assembly sheet, a second electrode sheet, and a surrounding wall. The assembly sheet comprises a first dielectric sheet, a first electrode sheet, and a second dielectric sheet, which are sequentially bonded together from top to bottom. The edges of the first dielectric sheet and the second dielectric sheet are both further outward than the edge of the first electrode sheet. The assembly sheet also includes an insulating sealing ring for sealing the edge of the first electrode sheet. The surrounding wall is insulating and transparent. The top end of the surrounding wall is sealed to the bottom surface of the second dielectric sheet, and the bottom end is sealed to the top surface of the second electrode sheet. A first... The first chamber is provided with a plurality of through holes on the second electrode plate communicating with the first chamber, a first vent hole is provided on the surrounding wall, and a second vent hole is provided on the side wall of the liquid storage tank communicating with the first vent hole through a first connecting pipe; the second electrode plate and the surrounding wall are both disposed inside the liquid storage tank; at least one side of the second electrode plate and the combined plate are spaced apart from the inner wall of the liquid storage tank, and the bottom surface of the second electrode plate is spaced apart from the bottom surface of the liquid storage tank; the first electrode plate is electrically connected to the live wire of the AC power supply, and the second electrode plate is electrically connected to the neutral wire of the AC power supply; The air injection unit is an air pump, and the air outlet of the air pump is connected to the second vent hole through a second connecting pipe.

2. The low-temperature plasma activated water preparation apparatus according to claim 1, characterized in that: It also includes a cooling unit, which includes a radiator disposed outside the liquid storage tank, a water pump disposed outside the liquid storage tank, and a hot water absorption tank disposed inside the liquid storage tank. The hot water absorption tank is sealed and the first medium sheet serves as the bottom plate of the hot water absorption tank. The liquid storage tank is provided with a second liquid inlet and a second liquid outlet, and the hot water tank is provided with a third liquid inlet and a third liquid outlet. The liquid outlet of the water pump, the second liquid inlet and the third liquid inlet are connected in sequence. The third liquid outlet, the second liquid outlet and the liquid inlet of the radiator are connected in sequence. The liquid outlet of the radiator is connected to the liquid inlet of the water pump.

3. The low-temperature plasma activated water preparation apparatus according to claim 1, characterized in that: Both the first medium sheet and the second medium sheet extend out of the liquid storage tank at both ends, and the first medium sheet and the second medium sheet are respectively sealed to the liquid storage tank.

4. The low-temperature plasma activated water preparation apparatus according to claim 2, characterized in that: The radiator is a finned radiator.

5. The low-temperature plasma activated water preparation apparatus according to claim 1, characterized in that: The first dielectric sheet, the first electrode sheet, and the second dielectric sheet are bonded together in sequence, and the first dielectric sheet and the second dielectric sheet are respectively sealed to the insulating sealing ring.

6. The low-temperature plasma activated water preparation apparatus according to claim 1, characterized in that: The enclosure is rectangular cylindrical in shape.

7. The low-temperature plasma activated water preparation apparatus according to claim 1, characterized in that: The first dielectric sheet, the first electrode sheet, the second dielectric sheet, and the second electrode sheet are parallel to each other.

8. The low-temperature plasma activated water preparation apparatus according to claim 1, characterized in that: The first vent is higher than the second electrode plate.

9. The low-temperature plasma activated water preparation apparatus according to claim 2, characterized in that: The first dielectric sheet and the second dielectric sheet are made of quartz or glass; the first electrode sheet and the second electrode sheet are made of aluminum, copper or stainless steel; the liquid storage tank, the enclosure and the water absorption tank, except for the first dielectric sheet, are all made of acrylic.

10. A method for preparing low-temperature plasma activated water, based on the low-temperature plasma activated water preparation apparatus according to any one of claims 1-9, characterized in that: The liquid to be activated is injected into the storage tank through the first inlet. Then, the air pump is turned on to inject air into the first chamber to completely expel the liquid in the first chamber and maintain a dynamic gas-liquid fluctuation state. The dynamic gas-liquid fluctuation state means that the gas in the first chamber can enter the liquid located in the storage tank and outside the first chamber in the form of bubbles through the through holes on the second electrode plate, causing the liquid located in the storage tank and outside the first chamber to oscillate continuously. During the oscillation, some liquid can enter the first chamber through the through holes on the second electrode plate. Then, the AC power supply is turned on to form plasma by ionizing the air in the first chamber. The second electrode plate directly activates the liquid entering the first chamber. The plasma-rich gas in the first chamber diffuses into the storage tank and indirectly activates the liquid in the storage tank until highly activated plasma-activated water is prepared.

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