Low-temperature plasma activated water preparation device and method

Abstract

The invention discloses a low-temperature plasma activated water preparation device and method, and belongs to the field of low-temperature plasma activated water preparation. The low-temperature plasma activated water preparation device comprises a filtering module and a plasma generation module, the top of the filtering module is detachable, is provided with a water inlet, is connected with the peristaltic pump through a hose, is filled with various filtering materials, and is connected with the dielectric barrier reactor at the bottom; the plasma generation module comprises a dielectric barrier discharge reactor, the upper end of the outer side of the reactor is provided with a gas inlet hole and connected with a gas cylinder through a gas flowmeter, the middle upper portion of the outer side is wrapped with a layer of iron gauze and connected with the high-voltage output end of a power source, and a stainless steel rod is coaxially placed in the center and connected with a ground electrode. And the lower end of the discharge blocking medium corundum ceramic tube is connected with the base and is provided with a water outlet. The device realizes filtration and sterilization integrated treatment of natural water, and can efficiently prepare activated water with high active component concentration.

Description

Technical Field

[0001] The invention relates to the field of low-temperature plasma activated water preparation, and in particular to a low-temperature plasma activated water preparation device and method. Background Art

[0002] Plasma gas discharge is a new biochemical technology that is green, clean, safe and effective. It can produce a variety of active nitrogen oxides (hydroxyl radicals, ozone, hydrogen peroxide, nitrate, nitrite, etc.) through air discharge. It can achieve good bacterial killing effect in a short time without adding any chemical reagents. In addition, the water sample treated with plasma contains a large amount of active nitrogen oxides in a short time, which has short-term biochemical activity and 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 in it greatly affects the bactericidal performance.

[0003] Currently, a variety of cold plasma technologies, such as bubble discharge, corona discharge, sliding arc discharge, jet and dielectric barrier discharge (DBD), are used to generate PAW. Among them, the jet structure and DBD are the most widely used, because these two plasma discharge modes can stably transfer active substances from gaseous plasma to liquid phase. Compared with the jet, the DBD structure has the advantages of simple discharge device structure and large processing area.

[0004] The current traditional low-temperature plasma activated water preparation devices have the disadvantages of high discharge threshold, low activated water preparation efficiency, and poor sterilization effect. Most of them can only process static water samples. The water film structure reactor that can process flowing water samples has the disadvantages of unstable discharge and low gas-liquid mass transfer efficiency. Summary of the invention

[0005] The purpose of the present invention is to address the deficiencies of the above-mentioned prior art. The present invention provides a low-temperature plasma activated water preparation device and method, which can continuously treat flowing water samples under low discharge starting voltage conditions, thereby efficiently preparing activated water with high active component concentration and achieving efficient killing of bacteria.

[0006] The present invention adopts the following technical solutions to solve the above technical problems:

[0007] A low-temperature plasma activated water preparation device comprises a filtering module and a plasma generating module. The filtering module comprises a container cover and a multi-stage filtering layer, and the plasma generating module comprises a dielectric barrier discharge reactor.

[0008] Furthermore, the container cover on the top of the filter module is detachable and has a water inlet with an inner diameter of 5 mm at the center, which is connected to the peristaltic pump through a hose. The multi-stage filter layer is evenly filled in the filter container, and the multi-stage filter layer is composed of a plurality of preferred filter materials.

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

[0010] Furthermore, a layer of wire mesh with a height of 3 cm is tightly wrapped around the middle and upper 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 coaxially placed inside the dielectric barrier reactor.

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

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

[0013] Furthermore, the porous foam ceramic is made of zirconia, is 15 cm high, and is prepared by 3D printing technology.

[0014] Furthermore, the lower end of the quartz glass inside the dielectric barrier reactor is fixed to the base through a flange and an adapter, so that the internal corundum ceramic tube and porous foam ceramic can be easily disassembled and replaced.

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

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

[0017] Step S1. uniformly filling a multi-stage filter layer in a filter device, and coaxially filling a corundum ceramic tube and a porous foam ceramic in a dielectric barrier discharge reactor;

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

[0019] Step S3. After the airflow is stabilized, the high voltage power supply is started, and gas phase discharge occurs in the gap between the quartz glass wrapped by the wire mesh and the corundum ceramic tube;

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

[0021] Step S5. Under the action of airflow, the gas phase active substances generated by the plasma further conduct gas-liquid mass transfer with the liquid phase in the pores of the porous foam ceramic for a long time;

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

[0023] Compared with the prior art, the present invention adopts the above technical solution and 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 dielectric barrier discharge reactor, the integrated treatment of natural water in the wild is realized, the application range of the device is expanded, and activated water with a high concentration of active components can be efficiently prepared.

[0025] (2) The present invention fills the discharge region of the dielectric barrier discharge reactor with a corundum ceramic tube to reduce the discharge gap, thereby achieving continuous treatment of flowing water samples while lowering the discharge threshold and improving discharge uniformity, stability and energy conversion efficiency.

[0026] (3) In the present invention, porous foam ceramics are coaxially filled below the discharge region inside the dielectric barrier reactor, and 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 the present invention, plasma can be generated at a low input voltage, and the energy used is lower than that of the conventional activated water preparation device. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0029] Among them, 1. filtration module; 2. plasma generation module; 3. corundum ceramic tube; 4. stainless steel rod; 5. container cover; 6. multi-stage filtration layer; 7. high voltage power supply; 8. porous foam ceramic; 9. base. DETAILED DESCRIPTION

[0030] The specific implementation of the present invention is further described below in conjunction with the accompanying drawings, and the technical solutions in the embodiments of the present invention are clearly and completely described. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0031] Embodiment 1:

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

[0033] Furthermore, the container cover 5 on the top of the filtration 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 filtration layer 6 is evenly filled in the filtration container and is connected to the medium barrier reactor at the bottom. The multi-stage filtration layer is composed of a plurality of preferred filtration materials to filter out large particle impurities and chromaticity in natural water in the wild.

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

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

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

[0037] Furthermore, the interior of the dielectric barrier discharge reactor is coaxially filled with a corundum ceramic tube 3 and a porous foam ceramic 8. A slightly curved groove is left at the top of the corundum ceramic tube 3, and the top edge adopts a chamfered structure to ensure that water flows 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 5 mm.

[0038] Furthermore, the porous foam ceramic 8 is made of zirconium oxide and is 15 cm high. The porous structure prepared by 3D printing technology is used to prolong 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 dielectric barrier reactor is fixed to the base 9 through a flange and an adapter, so as to facilitate the disassembly and replacement of the internal corundum ceramic tube 3 and the porous foam ceramic 8.

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

[0041] Embodiment 2:

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

[0043] Step S1. uniformly filling a multi-stage filter layer (6) in a filter device, and coaxially filling a corundum ceramic tube (3) and a porous foam ceramic (8) in a 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 through the gas inlet at a constant speed;

[0045] Step S3. After the airflow is stabilized, the high voltage power supply (7) is started, and gas phase discharge occurs in the gap between the quartz glass wrapped by the 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 water inlet at a constant water flow rate. The particulate impurities and color and odor in the water are effectively filtered out after passing through the filter device, and then flow into the top groove of the corundum ceramic tube (3), and then flow evenly down along the outer wall of the corundum ceramic tube (3), and gas-liquid two-phase discharge occurs at the discharge gap;

[0047] Step S5. Under the action of airflow, the gas phase active substances generated by the plasma further conduct gas-liquid mass transfer with the liquid phase in the pores of the porous foam ceramic for a long time;

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

[0049] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements 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 comprises a filtering module (1) and a plasma generating module (2), wherein the filtering module comprises a container cover (5) and a multi-stage filtering layer (6), and the plasma generating module (2) comprises a dielectric barrier discharge reactor.

2. A low-temperature plasma activated water preparation device according to claim 1, characterized in that, 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, which is connected to a peristaltic pump via a hose. The multi-stage filter layer (6) is evenly filled in the filter container, and the multi-stage filter layer is composed of a plurality of preferred filter materials.

3. A low-temperature plasma activated water preparation device according to claim 1, characterized in that, The dielectric barrier discharge reactor in the plasma generating module (2) is a coaxial DBD, the body of which is made of quartz glass. The top of the dielectric barrier discharge reactor is coaxially connected to the filtering module (1), and an air inlet is provided at the upper outer end, which is connected to the gas cylinder through a gas flow meter.

4. A low-temperature plasma activated water preparation device according to claim 3, characterized in that, A layer of wire mesh with a height of 3 cm is tightly wrapped around the middle and upper part of the outer side of the quartz glass of the dielectric barrier discharge reactor as a high-voltage electrode, which is connected to a high-voltage power supply (7). A stainless steel rod (4) is coaxially placed inside the dielectric barrier reactor.

5. A low-temperature plasma activated water preparation device according to claim 4, characterized in that, The bottom of the stainless steel rod (4) passes through the base (9) and is connected to the ground wire as a ground electrode.

6. A low-temperature plasma activated water preparation device according to claim 3, characterized in that, The dielectric barrier discharge reactor is coaxially filled with a corundum ceramic tube (3) and a porous foam ceramic (8); a slightly curved groove is left at the top of the corundum ceramic tube (3), and the top edge adopts a chamfered structure to ensure that water flows evenly along the outer wall of the corundum ceramic tube (3); and the distance between the outer side of the ceramic tube (3) and the quartz glass is 5 mm.

7. A low-temperature plasma activated water preparation device according to claim 6, characterized in that: The porous foam ceramic (8) is made of zirconium oxide, has a height of 15 cm, and is prepared by 3D printing technology.

8. A low-temperature plasma activated water preparation device according to claim 1, characterized in that: The lower end of the quartz glass of the dielectric barrier reactor is fixed on the base (9) through a flange and an adapter, so that the internal corundum ceramic tube (3) and porous foam ceramic (8) can be easily disassembled and replaced.

9. A low-temperature plasma activated water preparation device according to claim 8, characterized in that: The bottom of the base (9) is provided with a water outlet with an inner diameter of 5 mm.

10. A low-temperature plasma activated water preparation device and a low-temperature plasma activated water preparation method according to claim 1, characterized in that: The steps include: Step S1. uniformly filling a multi-stage filter layer (6) in a filter device, and coaxially filling a corundum ceramic tube (3) and a porous foam ceramic (8) in a 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 through the gas inlet at a constant speed; Step S3. After the airflow is stabilized, the high voltage power supply (7) is started, and gas phase discharge occurs in the gap between the quartz glass wrapped by the wire mesh and the corundum ceramic tube (3); Step S4. Turn on the peristaltic pump and pump water into the filter device through the water inlet at a constant water flow rate. The particulate impurities and color odor in the water are effectively filtered out after passing through the filter device, and then flow into the top groove of the corundum ceramic tube (3), and then flow evenly down along the outer wall of the corundum ceramic tube (3), and gas-liquid two-phase discharge occurs at the discharge gap; Step S5. Under the action of airflow, the gas phase active substances generated by the plasma further conduct gas-liquid mass transfer with the liquid phase in the pores of the porous foam ceramic for a long time; Step S6. During the discharge, the electrical parameters are measured using a high-voltage probe, a current loop and an oscilloscope. After the discharge, the activated water is collected and the physical and chemical properties and the concentration of active components of the activated water are measured using a pH meter, a conductivity meter and an ultraviolet spectrophotometer.

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