A low-temperature plasma activated water preparation device and method

Abstract

This invention discloses a low-temperature plasma activated water preparation device and method, belonging to the field of low-temperature plasma activated water preparation. The low-temperature plasma activated water preparation device includes a filtration module and a plasma generation module. The filtration module has a detachable top with a water inlet, connected to a peristaltic pump via a hose, and is filled with various filter materials. Its bottom is connected to a dielectric barrier reactor. The plasma generation module includes a dielectric barrier discharge reactor. An air inlet is located at the upper outer side of the reactor, connected to a gas cylinder via a gas flow meter. A layer of wire mesh is wrapped around the upper middle part of the reactor and connected to the high-voltage output of a power supply. A stainless steel rod is coaxially placed at the center and connected to a ground electrode, and is coaxially filled with a discharge barrier dielectric corundum ceramic tube and porous foam ceramic. The lower end is connected to a base and has a water outlet. The device achieves integrated filtration and sterilization treatment of natural water and can efficiently prepare activated water with high concentrations of active components.

Description

Technical Field

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

[0002] Plasma gas discharge, as a green, clean, safe, and effective new biochemical technology, can generate various active nitrogen oxides (hydroxyl radicals, ozone, hydrogen peroxide, nitrate, nitrite, etc.) through air discharge. Without adding any chemical reagents, it can achieve good bacterial killing effects in a short time. Furthermore, water samples treated with plasma contain a large amount of active nitrogen oxides for a short period, exhibiting transient biochemical activity; this can be called plasma-activated water (PAW). The active nitrogen oxides contained in this type of activated water have good antibacterial and even bactericidal abilities, and the content of active nitrogen oxides significantly affects the bactericidal performance.

[0003] Currently, various cold plasma technologies, such as bubble discharge, corona discharge, sliding arc discharge, jet discharge, and dielectric barrier discharge (DBD), are used to generate PAW (Potentially Active Material). Among these, jet structures and DBD are the most widely used because these two plasma discharge methods can stably transfer active materials from the gaseous plasma to the liquid phase. Compared to jet discharge, DBD structures have the advantages of simpler discharge device structure and larger processing area.

[0004] Current traditional low-temperature plasma activated water preparation devices have drawbacks such as high discharge threshold, low activation water preparation efficiency, and poor sterilization effect. Moreover, most of them can only process static water samples. Water film reactors that can process flowing water samples have the disadvantages of unstable discharge and low gas-liquid mass transfer efficiency. Summary of the Invention

[0005] The purpose of this invention is to address the shortcomings of the prior art by providing a low-temperature plasma activated water preparation device and method, which can continuously process flowing water samples under low discharge initiation voltage conditions, thereby efficiently preparing activated water with high concentration of active components and achieving efficient killing of bacteria.

[0006] To solve the above-mentioned technical problems, the present invention adopts the following technical solution:

[0007] A low-temperature plasma activated water preparation device includes a filtration module and a plasma generation module. The filtration module includes a container lid and a multi-stage filtration layer, and the plasma generation module includes a dielectric barrier discharge reactor.

[0008] Furthermore, the container cover at the top of the filter module is removable and has a water inlet with an inner diameter of 5mm at the center. The water inlet is connected to a peristaltic pump via a hose. The multi-stage filter layer is uniformly filled inside the filter container and is composed of a combination of several preferred filter materials.

[0009] Furthermore, the dielectric barrier discharge reactor in the plasma generation module is a coaxial DBD with a quartz glass body. The top of the dielectric barrier discharge reactor is coaxially connected to the filter module, and an air inlet is provided on the upper outer side, which is connected to the gas cylinder through a gas flow meter.

[0010] Furthermore, a 3cm high wire mesh is tightly wrapped around the upper middle part of the outer side of the quartz glass as a high-voltage electrode, which is connected to a high-voltage power supply. A stainless steel rod is placed coaxially inside the medium barrier reactor.

[0011] Furthermore, the bottom of the stainless steel rod passes through the base and serves as a ground electrode connected to the ground wire.

[0012] Furthermore, the interior of the dielectric barrier discharge reactor is coaxially filled with corundum ceramic tubes and porous foam ceramics. The top of the corundum ceramic tube has a slightly curved groove, and the top edge adopts a chamfered structure to ensure that the water flows down the outer wall of the corundum ceramic tube evenly. The distance between the outer side of the ceramic tube and the quartz glass is 5mm.

[0013] Furthermore, the porous foam ceramic material is zirconium oxide, 15cm high, and is prepared using 3D printing technology.

[0014] Furthermore, the lower end of the quartz glass inside the media barrier reactor is fixed to the base via flanges and adapters, facilitating the disassembly and replacement of the internal corundum ceramic tubes and porous foam ceramics.

[0015] Furthermore, the bottom of the base is equipped with a water outlet with an inner diameter of 5mm.

[0016] A method for preparing water activated by low-temperature plasma includes the following steps:

[0017] Step S1. Uniformly fill the filter device with multi-stage filter layers, and coaxially fill the dielectric barrier discharge reactor with corundum ceramic tubes and porous foam ceramics.

[0018] Step S2. Open the gas cylinder and use a gas flow meter to introduce gas into the dielectric barrier discharge reactor at a constant speed through the gas inlet.

[0019] Step S3. After the airflow stabilizes, start the high-voltage power supply to generate a gas phase discharge in the gap between the quartz glass wrapped in wire mesh and the corundum ceramic tube.

[0020] Step S4. Turn on the peristaltic pump and pump water into the filter device through the inlet at a constant water flow rate. Particle impurities, color and odor in the water are effectively filtered out after passing through the filter device. The water then flows into the groove at the top of the corundum ceramic tube and flows down evenly along the outer wall of the corundum ceramic tube. A gas-liquid two-phase discharge occurs at the discharge gap.

[0021] Step S5. Under the action of airflow, the gaseous active material generated by the plasma undergoes further long-term gas-liquid mass transfer with the liquid phase in the pores of the porous foam ceramic.

[0022] Step S6. During the discharge, electrical parameters are measured using a high-voltage probe, current loop, and oscilloscope. After the discharge ends, the activated water is collected, and the physicochemical properties and active component concentration of the prepared activated water are measured using a pH meter, conductivity meter, and ultraviolet spectrophotometer.

[0023] Compared with the prior art, the present invention, employing the above technical solution, has the following beneficial effects:

[0024] (1) The device of the present invention has a compact and reasonable structure and is easy to operate. By combining the filtration device with the medium barrier discharge reactor, it realizes the integrated treatment of natural water in the field, expands the application range of the device, and can efficiently prepare activated water with high concentration of active components.

[0025] (2) The present invention reduces the discharge gap by filling the discharge area of ​​the dielectric barrier discharge reactor with corundum ceramic tubes, thereby achieving continuous treatment of flowing water samples while reducing the discharge threshold and improving the uniformity, stability and energy conversion efficiency of discharge.

[0026] (3) In this invention, porous foam ceramic is coaxially filled below the discharge area inside the medium barrier reactor. The porous structure prolongs the gas-liquid mass transfer time and enhances the gas-liquid mass transfer effect, thereby achieving the purpose of improving the sterilization effect and the concentration of active components.

[0027] (4) In this invention, plasma can be generated under low input voltage, and the energy required is lower than that of traditional activated water preparation devices. Attached Figure Description

[0028] Figure 1 This is a schematic diagram of a low-temperature plasma activated water preparation device.

[0029] The components include: 1. Filter module; 2. Plasma generation module; 3. Corundum ceramic tube; 4. Stainless steel rod; 5. Container lid; 6. Multi-stage filter layer; 7. High-voltage power supply; 8. Porous foam ceramic; and 9. Base. Detailed Implementation

[0030] The specific embodiments of the present invention will be further described below with reference to the accompanying drawings. The technical solutions in the embodiments of the present invention will be clearly and completely described. 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] Example 1:

[0032] like Figure 1 As shown, a low-temperature plasma activated water preparation device includes a filtration module 1 and a plasma generation module 2. The filtration module includes a container cover 5 and a multi-stage filtration layer 6, and the plasma generation module 2 includes a dielectric barrier discharge reactor.

[0033] Furthermore, the container cover 5 at the top of the filter module 1 is detachable and has a water inlet with an inner diameter of 5mm at the center. The water inlet is connected to a peristaltic pump via a hose. The multi-stage filter layer 6 is uniformly filled in the filter container and connected to the media barrier reactor at the bottom. The multi-stage filter layer is composed of a combination of several preferred filter materials to filter out large particulate impurities and color in natural outdoor water.

[0034] Furthermore, the dielectric barrier discharge reactor in the plasma generation module 2 is a coaxial DBD with a quartz glass body. The top of the dielectric barrier discharge reactor is coaxially connected to the filter module 1, and an air inlet is provided on the upper outer side, which is connected to the gas cylinder through a gas flow meter.

[0035] Furthermore, a 3cm high wire mesh is tightly wrapped around the upper part of the outer side of the quartz glass as a high-voltage electrode, which is connected to the high-voltage power supply 7. A stainless steel rod 4 is placed coaxially inside the medium barrier reactor.

[0036] Furthermore, the bottom of the stainless steel rod 4 passes through the base 9 and serves as a ground electrode connected to the ground wire.

[0037] Furthermore, the interior of the dielectric barrier discharge reactor is coaxially filled with corundum ceramic tube 3 and porous foam ceramic 8. The top of the corundum ceramic tube 3 has a slightly curved groove, and the top edge adopts a chamfered structure to ensure that the water flows down evenly along the outer wall of the corundum ceramic tube 3. The distance between the outer side of the ceramic tube 3 and the quartz glass is 5mm.

[0038] Furthermore, the porous foam ceramic 8 is made of zirconium oxide and is 15cm high. The porous structure prepared by 3D printing technology is used to extend the gas-liquid mass transfer time and enhance the gas-liquid mass transfer effect.

[0039] Furthermore, the lower end of the quartz glass inside the media barrier reactor is fixed to the base 9 via a flange and adapter, facilitating the disassembly and replacement of the internal corundum ceramic tube 3 and porous foam ceramic 8.

[0040] Furthermore, the bottom of the base 9 is equipped with a water outlet with an inner diameter of 5mm.

[0041] Example 2:

[0042] Based on the low-temperature plasma activated water preparation apparatus of Example 1, this embodiment provides a method for preparing low-temperature plasma activated water, including the following steps:

[0043] Step S1. A multi-stage filter layer (6) is uniformly filled in the filter device, and a corundum ceramic tube (3) and porous foam ceramic (8) are coaxially filled in the dielectric barrier discharge reactor.

[0044] Step S2. Open the gas cylinder and use a gas flow meter to introduce gas into the dielectric barrier discharge reactor at a constant speed through the gas inlet.

[0045] Step S3. After the airflow stabilizes, start the high-voltage power supply (7) to generate a gas phase discharge in the gap between the quartz glass wrapped in wire mesh and the corundum ceramic tube (3).

[0046] Step S4. Turn on the peristaltic pump and pump water into the filter device through the inlet at a constant water flow rate. Particle impurities, color and odor in the water are effectively filtered out after passing through the filter device. Then the water flows into the groove at the top of the corundum ceramic tube (3) and flows down evenly along the outer wall of the corundum ceramic tube (3). Gas-liquid two-phase discharge occurs at the discharge gap.

[0047] Step S5. Under the action of airflow, the gaseous active material generated by the plasma undergoes further long-term gas-liquid mass transfer with the liquid phase in the pores of the porous foam ceramic.

[0048] Step S6. During the discharge, electrical parameters are measured using a high-voltage probe, current loop, and oscilloscope. After the discharge ends, the activated water is collected, and the physicochemical properties and active component concentration of the prepared activated water are measured using a pH meter, conductivity meter, and ultraviolet spectrophotometer.

[0049] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A low-temperature plasma activated water preparation device, characterized in that, It includes a filtration module (1) and a plasma generation module (2). The filtration module includes a container cover (5) and a multi-stage filtration layer (6). The plasma generation module (2) includes a dielectric barrier discharge reactor. The container cover (5) on the top of the filter module (1) is detachable and has a water inlet with an inner diameter of 5 mm at the center. The water inlet is connected to the peristaltic pump through a hose. The multi-stage filter layer (6) is uniformly filled in the filter container. The multi-stage filter layer is composed of a combination of multiple filter materials. The dielectric barrier discharge reactor in the plasma generation module (2) is a coaxial DBD with a quartz glass body. The top of the dielectric barrier discharge reactor is coaxially connected to the filter module (1), and an air inlet is provided on the upper outer side. It is connected to the gas cylinder through a gas flow meter. The upper middle part of the outer side of the dielectric barrier discharge reactor is tightly wrapped with a 3cm high wire mesh as a high voltage electrode, which is connected to the high voltage power supply (7). A stainless steel rod (4) is placed coaxially inside the dielectric barrier reactor. The bottom of the stainless steel rod (4) passes through the base (9) and serves as a ground electrode connected to the ground wire; The dielectric barrier discharge reactor is coaxially filled with alumina ceramic tube (3) and porous foam ceramic (8). The top of the alumina ceramic tube (3) has a slightly curved groove, and the top edge adopts a chamfered structure to ensure that the water flows down evenly along the outer wall of the alumina ceramic tube (3). The distance between the outer side of the ceramic tube (3) and the quartz glass is 5mm.

2. The low-temperature plasma activated water preparation device according to claim 1, characterized in that, The porous foam ceramic (8) is made of zirconium oxide, is 15cm high, and is prepared by 3D printing technology.

3. The low-temperature plasma activated water preparation device according to claim 1, characterized in that, The lower end of the quartz glass of the media barrier reactor is fixed to the base (9) by a flange and an adapter, which facilitates the disassembly and replacement of the internal corundum ceramic tube (3) and porous foam ceramic (8).

4. The low-temperature plasma activated water preparation device according to claim 3, characterized in that, The base (9) has a water outlet with an inner diameter of 5mm at the bottom.

5. A method for preparing water activated by low-temperature plasma, characterized in that, The method for preparing low-temperature plasma activated water is applied to the low-temperature plasma activated water preparation apparatus as described in any one of claims 1-4, and the method for preparing low-temperature plasma activated water includes the following steps: Step S1. A multi-stage filter layer (6) is uniformly filled in the filter device, and a corundum ceramic tube (3) and porous foam ceramic (8) are coaxially filled in the dielectric barrier discharge reactor. Step S2. Open the gas cylinder and use a gas flow meter to introduce gas into the dielectric barrier discharge reactor at a constant speed through the gas inlet; Step S3. After the airflow stabilizes, start the high-voltage power supply (7) to generate a gas phase discharge in the gap between the quartz glass wrapped in wire mesh and the corundum ceramic tube (3). Step S4. Turn on the peristaltic pump and pump water into the filter device through the inlet at a constant water flow rate. Particle impurities, color and odor in the water are effectively filtered out after passing through the filter device. Then the water flows into the groove at the top of the corundum ceramic tube (3) and then flows down evenly along the outer wall of the corundum ceramic tube (3). Gas-liquid two-phase discharge occurs at the discharge gap. Step S5. Under the action of airflow, the gaseous active material generated by the plasma undergoes further long-term gas-liquid mass transfer with the liquid phase in the pores of the porous foam ceramic. Step S6. During the discharge, electrical parameters are measured using a high-voltage probe, current loop, and oscilloscope. After the discharge ends, the activated water is collected, and the physicochemical properties and active component concentration of the prepared activated water are measured using a pH meter, conductivity meter, and ultraviolet spectrophotometer.

Images