Multi-mode air surface discharge plasma water activating equipment and method

Abstract

The invention discloses a multi-mode intelligent plasma activated water device and method, and belongs to the technical field of plasma activated water preparation. The equipment comprises an air supply unit, a plasma generation unit, a gas-liquid mass transfer unit and an intelligent control unit, the plasma generation unit comprises a plurality of surface dielectric barrier discharge plates which are arranged in parallel; and the intelligent control unit is configured to be switched to operate in two working states of a low-power ozone mode and a high-power nitrogen oxide mode. In the low-power ozone mode, the discharge plates alternately supply power and automatically switch when detecting that the temperature reaches a preset threshold value; and in a high-power nitrogen oxide mode, the discharge plate synchronously and continuously works. The multi-purpose machine is achieved through mode switching, overheating is effectively prevented and the service life is prolonged through alternate power supply in a low-power mode, efficient treatment is achieved in a high-power mode, the differentiated requirements of different scenes for activated water components are met, and the multi-purpose machine has the advantages of being flexible in operation, high in stability and high in intelligent degree.

Description

Multimode air surface discharge plasma activation water equipment and method Technical Field

[0001] This invention belongs to the field of plasma-activated water preparation technology, and relates to a multi-mode air surface discharge plasma-activated water device and method. Background Technology

[0002] With the rapid development of modern agriculture, healthcare, and environmental governance, the demand for efficient, safe, and environmentally friendly disinfection, sterilization, pollutant degradation, and bioactivity regulation technologies is becoming increasingly urgent. While traditional chemical reagent treatment methods meet some functional requirements, their inherent risks of chemical residues, potential secondary pollution, complex operation, and high costs have prompted research and industry to continuously seek greener and more sustainable alternative technologies. Against this backdrop, plasma-activated water technology has emerged and gradually become a research hotspot both domestically and internationally. This technology utilizes the interaction between atmospheric pressure cold plasma and deionized water to generate various active particles in the water, including hydrogen peroxide, ozone, hydroxyl radicals, and nitrogen oxides. Leveraging the strong oxidizing and reactive properties of these active components, it achieves efficient inactivation of microorganisms, deep degradation of organic pollutants, and precise regulation of biological processes, demonstrating broad application potential in food processing, agricultural pest and disease control, wastewater treatment, and even biomedicine.

[0003] However, despite the positive progress made in mechanistic research and laboratory verification of plasma-activated water, significant technical bottlenecks remain in its large-scale preparation and application. Existing devices largely rely on a single discharge mode, making it difficult to flexibly adapt to the diverse needs of different application scenarios regarding the types, concentrations, and intensities of active ingredients, thus limiting technological adaptability. Furthermore, most preparation equipment remains at the laboratory level, with fragmented structures, low discharge efficiency, and a lack of modular design and scalability, failing to support continuous and stable industrial production and severely hindering the industrialization of this technology. In addition, the stability and functionality of the discharge process are often difficult to balance; prolonged operation in a single mode can easily lead to a decrease in the efficiency of active substance generation due to heat accumulation, affecting the durability and consistency of the activated water's performance. Summary of the Invention

[0004] The purpose of this invention is to solve the technical problem of low water dissolution efficiency of active particles caused by the single discharge mode in existing plasma-activated water equipment, and to provide a multi-mode air surface discharge plasma-activated water equipment and method.

[0005] To achieve the above objectives, the present invention employs the following technical solution: The first aspect of the present invention provides a multi-mode air surface discharge plasma activation water device, comprising: an intelligent control unit, and an air supply unit, a plasma generation unit, and a gas-liquid mass transfer unit respectively connected to the intelligent control unit; the plasma generation unit is located downstream of the air supply unit and communicates with the gas-liquid mass transfer unit; air pumped out by the air supply unit enters the plasma generation unit for dissociation, generating activation gas; the activation gas enters the gas-liquid mass transfer unit to activate water; the plasma generation unit includes several parallelly arranged surface dielectric barrier discharge plates; the intelligent control unit is configured to switch between two operating states: low-power ozone mode and high-power nitrogen oxide mode; in low-power ozone mode, the several surface dielectric barrier discharge plates are alternately powered, so that only some surface dielectric barrier discharge plates are in working state at any given time, and automatically switch to the remaining discharge plates to continue discharging when the temperature of the currently working discharge plate reaches a preset threshold; in high-power nitrogen oxide mode, the several surface dielectric barrier discharge plates are synchronously powered and continuously operate.

[0006] Furthermore, the plasma generating unit includes three surface dielectric barrier discharge plates arranged in parallel.

[0007] Furthermore, among the three surface dielectric barrier discharge plates, the surface dielectric barrier discharge plates located on both sides are single-sided discharge structures, while the surface dielectric barrier discharge plate located in the middle is a double-sided discharge structure.

[0008] Furthermore, in low-power ozone mode, the three surface dielectric barrier discharge plates are powered alternately in a time sequence.

[0009] Furthermore, the sequential alternating power supply specifically means that when the discharge temperature of the surface dielectric barrier discharge plates located on both sides reaches a preset threshold at the same time, the discharge is switched to the surface dielectric barrier discharge plate located in the middle.

[0010] Furthermore, a temperature sensor is provided on the surface dielectric barrier discharge plate to measure the discharge temperature of the surface dielectric barrier discharge plate.

[0011] Furthermore, the gas-liquid mass transfer unit includes a second ventilation hose and an aeration head; one end of the second ventilation hose is connected to the plasma generating unit, and the other end is connected to the aeration head, for introducing the activation gas generated by the plasma generating unit into the liquid to be treated through the aeration head.

[0012] Furthermore, the intelligent control unit integrates a fault self-diagnosis module, which automatically terminates plasma discharge and triggers an audible and visual alarm when a device fault is detected.

[0013] Furthermore, the air supply unit includes an air pump and a first ventilation hose arranged sequentially along the airflow direction; the outlet end of the first ventilation hose is connected to the air inlet of the plasma generating unit.

[0014] A second aspect of the present invention provides a multi-mode air surface discharge plasma activation water method, comprising the following steps: setting the equipment operation mode through an intelligent control unit; the operation mode includes a low-power ozone mode or a high-power nitrogen oxide mode; starting the air supply unit to deliver air to the plasma generation unit; according to the set operation mode, the intelligent control unit controls multiple surface dielectric barrier discharge plates in the plasma generation unit to execute corresponding discharge strategies to generate activation gas; and introducing the generated activation gas into a gas-liquid mass transfer unit to contact and mix with the liquid to be treated to obtain plasma-activated water.

[0015] Compared with existing technologies, this invention has the following advantages: This invention discloses a multi-mode air surface discharge plasma activated water device. By setting a switchable low-power ozone mode and a high-power nitrogen oxide mode, the device can flexibly select to generate different types of active substances according to application requirements, achieving multi-purpose functionality. In the low-power ozone mode, an alternating power supply strategy effectively disperses heat accumulation, prevents overheating of the discharge plate, and extends the device's lifespan; simultaneously, automatic switching via temperature detection ensures a continuous and stable discharge process. In the high-power nitrogen oxide mode, synchronous power supply enables the rapid generation of high-concentration nitrogen oxides, meeting the needs for efficient sterilization or degradation of organic pollutants.

[0016] Furthermore, three surface dielectric barrier discharge plates are arranged in parallel, resulting in a compact structure and a large discharge area. This facilitates alternating discharge control, enhances the equipment's processing capacity and operational flexibility, and also promotes heat dissipation and uniform gas distribution.

[0017] Furthermore, the design, featuring single-sided discharge structures on both sides and a double-sided discharge structure in the middle, optimizes space utilization and discharge efficiency. The double-sided discharge plate can simultaneously release plasma to both sides in the middle position, enhancing gas handling capabilities. When used in conjunction with the single-sided discharge plate, it enables more flexible energy allocation and heat management.

[0018] Furthermore, by alternating power supply in a time sequence, each discharge board can work in turn, avoiding continuous operation of a single board for a long time, effectively reducing heat load, improving system stability and continuous operation capability, and is especially suitable for application scenarios that require stable output for a long time.

[0019] Furthermore, by introducing activating gas into the liquid through an aeration head, tiny bubbles are formed, increasing the gas-liquid contact area, improving mass transfer efficiency, ensuring that the active substances are fully dissolved in the water, and enhancing the generation efficiency and quality of activated water. Attached Figure Description

[0020] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present invention and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0021] Figure 1 is a schematic diagram of the structure and connection of the multi-mode intelligent plasma activated water equipment; Figure 2 is the FTIR spectrum curve of gaseous active species at different times during single-sided SDBD discharge; Figure 3 is a comparison of the concentration of main active particles in plasma activated water produced by introducing air in normal mode and high-efficiency mode respectively; Figure 4 is the circuit diagram of the multi-mode intelligent plasma activated water equipment; Figure 5 is the internal structure diagram of the multi-mode intelligent plasma activated water equipment.

[0022] Wherein: 1-Main switch; 2-Rectifier output; 3-Touch screen switch; 4-Air pump; 5-First ventilation hose; 6-First inverter circuit; 7-Second inverter circuit; 8-Third inverter circuit; 9-Gas chamber; 10-First plasma generator; 11-Second plasma generator; 12-Third plasma generator; 13-Second ventilation hose; 14-Aeration head; 15-Water tank; 16-Water outlet; 17-Water inlet; 18-Air vent. Detailed Implementation

[0023] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, 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. The components of the embodiments of the present invention described and marked in the accompanying drawings can generally be arranged and designed in various different configurations.

[0024] Therefore, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the invention without inventive effort are within the scope of protection of the invention.

[0025] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0026] In the description of the embodiments of the present invention, it should be noted that if terms such as "upper," "lower," "horizontal," or "inner" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of the invention is in use, they are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention. Furthermore, terms such as "first" and "second" are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0027] Furthermore, the use of the term "horizontal" does not imply that the component must be absolutely horizontal, but rather that it can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal than "vertical," and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0028] In the description of the embodiments of the present invention, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in the present invention according to the specific circumstances.

[0029] The present invention will be further described in detail below with reference to the accompanying drawings: Referring to Figures 1 and 5, one embodiment of the present invention provides a multi-mode air surface discharge plasma activated water device, which includes: an air supply unit, a plasma generation unit, a gas-liquid mass transfer unit, and an intelligent control unit; the plasma generation unit is located downstream of the air supply unit and is connected to the gas-liquid mass transfer unit, and the intelligent control unit is electrically connected to the air supply unit, the plasma generation unit, and the gas-liquid mass transfer unit respectively to achieve coordinated control.

[0030] The air supply unit includes an air pump 4 and a first ventilation hose 5 arranged sequentially in the airflow direction; the outlet end of the first ventilation hose 5 is connected to the air inlet of the plasma generating unit.

[0031] The plasma generating unit includes several parallel-arranged surface dielectric barrier discharge plates and a gas cavity 9; the several parallel-arranged surface dielectric barrier discharge plates are vertically arranged inside the gas cavity 9; an inverter circuit and a power supply are respectively connected upstream of the surface dielectric barrier discharge plates.

[0032] The intelligent control unit is configured to switch between two operating modes: low-power ozone mode and high-power nitrogen oxide mode. In low-power ozone mode, several surface dielectric barrier discharge plates are alternately powered, so that only some discharge plates are in working state at any given time, and automatically switch to the remaining discharge plates to continue discharging when the temperature of the currently working discharge plate reaches a preset threshold. In high-power nitrogen oxide mode, several surface dielectric barrier discharge plates are synchronously powered on and work continuously.

[0033] Specifically, this invention provides a multi-mode air surface discharge plasma activated water device, including a power supply circuit, a cooling fan, a discharge device, a water tank 15, a water pump, and an air pump 4. The air pump 4 pumps air into the gas chamber 9 through a first ventilation hose 5. After discharge treatment by the discharge device, activated gas is obtained. The activated gas is then introduced into the liquid to be treated in the water tank 15 through an aeration head 14 connected to a second ventilation hose 13, causing changes in the physicochemical parameters of the aqueous solution and generating a large number of liquid-phase active particles. Different functional plasma activated water is generated under different discharge modes. The discharge device includes a first plasma generator 10, a second plasma generator 11, and a third plasma generator 12. A first inverter circuit 6 is connected to the first plasma generator 10; a second inverter circuit 7 is connected to the second plasma generator 11; a third inverter circuit 8 is connected to the third plasma generator 12; a touch screen switch 3 is connected to the first inverter circuit 6, the second inverter circuit 7, and the third inverter circuit 8; a rectifier output 2 and a main switch 1 are connected upstream of the touch screen switch 3 in sequence; a water outlet 16, a water inlet 17, and a vent 18 are provided on the water tank 15.

[0034] The power supply circuit of this device is a rectified output 2, using 12V DC power supply. The voltage of the plasma generator is precisely regulated by the inverter circuit. Users can control the device's power on / off, work mode switching, discharge start / stop, and water output via the touch screen. All operation commands are transmitted to the intelligent control unit in real time and respond quickly. The plasma generator is implemented using an SDBD board (Surface Dielectric Barrier Discharge). The intelligent control unit, in conjunction with the temperature sensor on the SDBD board, monitors the board temperature in real time. When the temperature of the currently operating SDBD board reaches the 100℃ threshold, it automatically switches to another SDBD board for discharge, achieving uninterrupted operation of the discharge module and avoiding high temperatures that reduce ozone generation efficiency. At the same time, the intelligent control unit collects discharge parameters, water temperature, and other data in real time, constructing multi-parameter collaborative control logic to adapt to different power output modes. If faults such as over-temperature, abnormal voltage, or water flow interruption are detected, alarm information will be immediately pushed through the touch screen and shutdown protection will be triggered to ensure the stability and safety of the equipment operation.

[0035] In one embodiment of the present invention, the working gas for discharge is air, the water tank 15 can hold a maximum capacity of 650 ml of the solution to be treated, and the ambient temperature during the experimental reaction is room temperature, i.e., 25°C.

[0036] There are two discharge modes: low-power ozone mode and high-power intensive mode. As shown in Figure 2, in the initial stage of discharge, the absorbance of the O3 characteristic peak in the FTIR spectrum is significantly higher. At this stage, the system temperature is relatively low, and the efficiency of high-energy electrons in the plasma dissociating O2 to generate oxygen atoms is high. Moreover, the chain reaction rate of O and O2 combining to form O3 is faster than the O3 decomposition reaction, and the activated gas is more inclined to generate and enrich ozone. Therefore, in the low-power ozone mode, the SDBD plate discharges on one side only. When the temperature sensor detects that the temperature of the SDBD plate reaches 100℃, it automatically switches to the other side of the SDBD plate for single-sided discharge to prevent overheating and molecular thermal decomposition, which would lead to a decrease in ozone generation rate.

[0037] O3 is thermodynamically unstable. As the discharge time increases, the high temperature of the high-power, high-efficiency mode accelerates its thermal decomposition (2 O3 → 3 O2) and promotes the reaction of O3 with reactive species such as NO, leading to a significant decrease in O3 concentration and making it unable to remain stably. At the same time, the high temperature increases the electron energy and density in the plasma, lowering the energy barrier for N2 dissociation, making N2 more easily dissociated into nitrogen atoms. N atoms rapidly undergo chain reactions with O atoms, O2, etc., producing gaseous NO, N2O5, etc. X The characteristic peak absorbance gradually increases, and the large amount of NO and NO2 generated eventually makes nitrate the dominant active product in the liquid phase.

[0038] As shown in Figure 3, in the high-power NOx mode (i.e., intensive mode), multiple discharge plates in the plasma generation unit operate synchronously and continuously, resulting in high energy injection density and significantly enhanced efficiency in the generation of active species. In this mode, the concentration of hydrogen peroxide (H2O2) reaches 18.5 μM, compared to 9.5 μM in the ordinary mode (i.e., low-power ozone mode), representing a yield increase of approximately 95%. The high concentration of H2O2 provides a stronger reactive basis for subsequent oxidation reactions, making it particularly suitable for applications requiring rapid and efficient oxidation. In the low-power ozone mode, a time-sequential discharge strategy allows the discharge plates to work and dissipate heat in rotation, effectively controlling the temperature rise of the discharge unit. When the temperature of the working discharge plate reaches a preset threshold (e.g., 100℃), the system automatically switches to the remaining discharge plates to continue discharging. In intensive mode, NO2... - The generation of O2 increased slightly, but the increase was relatively small (about 10%), indicating that the two modes had different regulatory effects on nitrogen-containing reactive species. O2 is a key reactive particle in plasma-activated water. - / ONOO - Its production process involves H2O2 and NO2. -It is produced in an acidic environment, and its concentration can reach 28.5 μM in the high-efficiency mode, which is about twice that of the normal mode. The level of this active particle directly determines the effect of activated water application.

[0039] One embodiment of the present invention provides a circuit diagram of a multi-mode air surface discharge plasma activated water device. Specifically, a 12V DC power supply is used as the total input, one path directly powers the air pump motor, and the other path, after voltage regulation, powers the core control board (U1) and the human-machine interface screen. The I / O ports of the control board are connected to three plasma generators respectively through three sets of independent relays (RELAY1, RELAY2, RELAY3). During operation, the control board independently controls the on / off state of each relay coil through high and low level signals according to the preset low-power ozone mode or high-power nitrogen oxide mode, thereby realizing independent on / off control of the power supply circuits of the three generators: in the low-power mode, the relays close alternately in sequence, causing the discharge plates to work in turn to control the temperature rise; in the high-power mode, the three sets of relays close simultaneously, causing all discharge plates to operate synchronously at full load to achieve maximum power output.

[0040] One embodiment of the present invention provides a multi-mode air surface discharge plasma activation water method, comprising the following steps: setting the equipment operation mode through an intelligent control unit; the operation mode includes a low-power ozone mode or a high-power nitrogen oxide mode; starting the air supply unit to deliver air to the plasma generation unit; according to the set operation mode, the intelligent control unit controls multiple surface dielectric barrier discharge plates in the plasma generation unit to execute corresponding discharge strategies to generate activation gas; and introducing the generated activation gas into a gas-liquid mass transfer unit to contact and mix with the liquid to be treated to obtain plasma-activated water.

[0041] In another embodiment of the present invention, the multi-mode air surface discharge plasma activation water method includes the following steps: when running in low-power ozone mode: the air supply unit is started, and the air pump delivers filtered air to the plasma generation unit at a flow rate of 3L / min.

[0042] Controlling the engagement of RELAY2 and RELAY3 energizes the single-sided discharge plates on both sides (plasma generators 1 and 3), while the middle discharge plate (plasma generator 2) remains in standby mode. The discharge voltage is 6kV and the frequency is 8kHz.

[0043] The temperature detection module collects the surface temperature of the two working discharge plates in real time.

[0044] After 15 minutes of continuous operation, when the surface temperature of both discharge plates reaches the preset threshold of 100°C, the control unit immediately disconnects RELAY2 and RELAY3, while simultaneously engaging RELAY1, switching to the middle double-sided discharge plate (plasma generator 2) to operate independently.

[0045] During the operation of the middle discharge plate, the two side discharge plates cool naturally. When the temperature of the middle plate reaches 100°C, the operation is switched back to the two side discharge plates. This cycle is repeated until the treatment is completed (total treatment time 60 minutes).

[0046] In high-power nitrogen oxide mode: the air supply unit is activated, and the air pump supplies gas to the plasma generation unit at a maximum flow rate of 5L / min.

[0047] The intelligent control unit executes a synchronous power supply program, simultaneously activating relays RELAY1, RELAY2, and RELAY3 to synchronously power on the three discharge boards (including two single-sided boards and one double-sided board). The discharge voltage is increased to 8kV and the frequency to 10kHz.

[0048] The three discharge boards operate continuously without switching, ensuring maximum energy injection. During operation, the intelligent control unit monitors discharge parameters and temperature in real time. If the temperature exceeds a safe threshold (e.g., 120°C), the fan is triggered for auxiliary cooling.

[0049] The activating gas is introduced into the wastewater through the aeration head and treated continuously for 30 minutes.

[0050] During operation in any mode, if the fault self-diagnosis module of the intelligent control unit detects any of the following abnormalities: a plasma generator fails to start normally (current detection is zero); the surface temperature of the discharge plate exceeds the set safety limit (e.g., 130°C); the air pump flow rate is lower than the set value (e.g., due to blockage); the control unit immediately executes the protection program: cuts off the power supply to all relays, terminates plasma discharge, triggers the audible and visual alarm device, and displays the fault code on the human-machine interface screen to remind the operator to check, effectively ensuring equipment and personal safety.

[0051] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A multi-mode air surface discharge plasma activation water device, characterized in that, include: The system includes an intelligent control unit, an air supply unit, a plasma generation unit, and a gas-liquid mass transfer unit, all connected to the intelligent control unit. The plasma generation unit is located downstream of the air supply unit and communicates with the gas-liquid mass transfer unit. Air pumped out by the air supply unit enters the plasma generation unit for dissociation, generating an activation gas. The activation gas then enters the gas-liquid mass transfer unit to activate water. The plasma generation unit comprises several parallel-arranged surface dielectric barrier discharge (SPD) plates. The intelligent control unit is configured to switch between two operating modes: a low-power ozone mode and a high-power nitrogen oxide (NOx) mode. In the low-power ozone mode, the SPD plates are alternately powered, ensuring that only a portion of the SPD plates are operational at any given time. When the temperature of the currently operating discharge plate reaches a preset threshold, the system automatically switches to the remaining plates to continue discharging. In the high-power NOx mode, the SPD plates are synchronously powered and operate continuously.

2. The multi-mode air surface discharge plasma activated water device according to claim 1, characterized in that, The plasma generation unit comprises three surface dielectric barrier discharge plates arranged in parallel.

3. The multi-mode air surface discharge plasma activated water device according to claim 2, characterized in that, Of the three surface dielectric barrier discharge plates, the two side surface dielectric barrier discharge plates are single-sided discharge structures, and the middle surface dielectric barrier discharge plate is a double-sided discharge structure.

4. The multi-mode air surface discharge plasma activated water device according to claim 3, characterized in that, In low-power ozone mode, the three surface dielectric barrier discharge plates are powered alternately in a time sequence.

5. The multi-mode air surface discharge plasma activated water device according to claim 4, characterized in that, The sequential alternating power supply specifically means that when the discharge temperature of the surface dielectric barrier discharge plates located on both sides reaches the preset threshold at the same time, the discharge is switched to the surface dielectric barrier discharge plate located in the middle.

6. The multi-mode air surface discharge plasma activated water device according to claim 1, characterized in that, A temperature sensor is provided on the surface dielectric barrier discharge plate to measure the discharge temperature of the surface dielectric barrier discharge plate.

7. The multi-mode air surface discharge plasma activated water device according to claim 1, characterized in that, The gas-liquid mass transfer unit includes a second ventilation hose (13) and an aeration head (14); one end of the second ventilation hose (13) is connected to the plasma generating unit, and the other end is connected to the aeration head (14), which is used to introduce the activation gas generated by the plasma generating unit into the liquid to be treated through the aeration head (14).

8. The multi-mode air surface discharge plasma activated water device according to claim 1, characterized in that, The intelligent control unit integrates a fault self-diagnosis module. When a fault is detected, it automatically terminates the plasma discharge and triggers an audible and visual alarm.

9. The multi-mode air surface discharge plasma activated water device according to claim 1, characterized in that, The air supply unit includes an air pump (4) and a first ventilation hose (5) arranged sequentially along the airflow direction; the outlet end of the first ventilation hose (5) is connected to the air inlet of the plasma generating unit.

10. A method for activating water using multimode air surface discharge plasma with the apparatus described in any one of claims 1 to 10, characterized in that, Includes the following steps: The equipment operating mode is set by the intelligent control unit; the operating mode includes low-power ozone mode or high-power nitrogen oxide mode; the air supply unit is started to deliver air to the plasma generation unit; according to the set operating mode, the intelligent control unit controls multiple surface dielectric barrier discharge plates in the plasma generation unit to execute the corresponding discharge strategy to generate activation gas; the generated activation gas is introduced into the gas-liquid mass transfer unit and mixed with the liquid to be treated to obtain plasma activated water.

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