Water film type dielectric barrier discharge water treatment device

Abstract

The utility model provides a water film type dielectric barrier discharge water treatment device which comprises a dielectric plate, the dielectric plate is obliquely arranged, the dielectric plate is provided with an upstream face, and the upstream face comprises a plurality of plane areas and concave areas arranged between every two adjacent plane areas; the first electrode is grounded, and the first electrode is arranged opposite to the upstream face; and the second electrode is electrically connected with the power supply, and the second electrode is arranged on the side, away from the upstream face, of the dielectric plate. A discharge area is formed between the first electrode and the second electrode, active particles can be generated, and wastewater is treated through the active particles. A plurality of concave regions are arranged on the smooth dielectric plate, the concave regions can increase the surface area of the dielectric plate relative to a plane region, so that the retention time of wastewater on the dielectric plate is prolonged, and the relative specific surface area of the dielectric plate with the concave regions is far larger than that of a smooth flat plate, so that the contact area of the wastewater and active particles in a discharge region can be enlarged; the pollutant degradation efficiency is greatly improved.

Description

Technical Field

[0001] This application relates to the technical field of water treatment, and more particularly, to a water film type dielectric barrier discharge water treatment device. Background Art

[0002] The discharge plasma technology is an advanced technology that uses active particles such as high-energy electrons, ions, and free radicals to treat pollutants. This technology has received attention in the field of control and purification of urban wastewater, pharmaceutical wastewater, mine wastewater, textile wastewater, etc. due to its high efficiency and environmental friendliness. At the same time, various discharge plasma reactors have emerged in response to different application requirements. Among them, the water film type dielectric barrier discharge reactor combines the dielectric barrier discharge technology with the characteristics of the water film, and is widely used by enhancing the gas-liquid contact area and improving the reaction efficiency by forming a water film between the electrodes.

[0003] However, although previous studies have been conducted on water treatment using the water film type dielectric barrier discharge reactor, there are still deficiencies. The main problems are as follows: The water film is usually formed on a smooth dielectric plate, and the flow rate is too fast, resulting in too short contact time between pollutants and active particles generated by discharge, so that the degradation efficiency is not high; The water film type dielectric barrier discharge reactor usually uses flat or columnar high-voltage electrodes, without discharge targeting, discharging in all directions, with high energy consumption and easy energy waste. Utility Model Content

[0004] This application aims to solve at least one of the technical problems existing in the prior art or related technologies.

[0005] To this end, this application proposes a water film type dielectric barrier discharge water treatment device, including:

[0006] A dielectric plate, which is inclined, and the dielectric plate is provided with a water-facing surface, and the water-facing surface includes a plurality of planar regions and concave regions provided between adjacent two planar regions;

[0007] A first electrode, which is grounded and is disposed opposite to the water-facing surface;

[0008] A second electrode, which is electrically connected to a power source and is disposed on the side of the dielectric plate away from the water-facing surface.

[0009] In a possible technical solution, further, in this technical solution, the first electrode includes:

[0010] At least one electrode member, and the electrode member is electrically connected to a power source;

[0011] A plurality of needle electrodes, and the plurality of needle electrodes are arranged at intervals on the electrode member.

[0012] In a possible technical solution, further, in this technical solution, a plurality of needle-shaped electrodes point to the planar region.

[0013] In a possible technical solution, further, in this technical solution, the cross-sectional shape of the concave region is arc-shaped;

[0014] Or, the cross-sectional shape of the concave region is rectangular;

[0015] Or, the cross-sectional shape of the concave region is triangular.

[0016] In a possible technical solution, further, in this technical solution, it further includes:

[0017] A water treatment tank, the dielectric plate and the first electrode are both located inside the water treatment tank;

[0018] A first water storage area, which is arranged inside the water treatment tank;

[0019] A second water storage area, which is arranged inside the water treatment tank;

[0020] Wherein, one end of the dielectric plate is connected to the first water storage area, and the other end of the dielectric plate is connected to the second water storage area.

[0021] In a possible technical solution, further, in this technical solution, it further includes:

[0022] A water inlet, which is communicated with the first water storage area;

[0023] A water outlet, which is communicated with the second water storage area;

[0024] A pump body, which is communicated with the water inlet and the water outlet through pipelines.

[0025] In a possible technical solution, further, in this technical solution, it further includes:

[0026] A first solenoid valve, which is arranged on the connecting pipeline between the pump body and the water inlet;

[0027] A second solenoid valve, which is arranged on the connecting pipeline between the pump body and the water outlet.

[0028] In a possible technical solution, further, in this technical solution, it further includes:

[0029] A first water retaining net, which is arranged adjacent to the dielectric plate in the first water storage area;

[0030] A second water retaining net, which is arranged adjacent to the dielectric plate in the second water storage area.

[0031] In a possible technical solution, further, in this technical solution, it further includes:

[0032] An air inlet, the air inlet communicating with the water treatment tank;

[0033] An air outlet, the air outlet communicating with the water treatment tank;

[0034] A compressor, the compressor communicating with the air inlet through a pipeline.

[0035] In a possible technical solution, further, in this technical solution, it further includes:

[0036] A third solenoid valve, the third solenoid valve being arranged on the connecting pipeline between the compressor and the air inlet.

[0037] The additional aspects and advantages of the present application will become apparent in the following description part, or be learned through the practice of the present application.

[0038] In the present application, the dielectric plate is inclined so that the wastewater will flow down from the dielectric plate and form a water film on the surface of the dielectric plate. The water-facing surface is the surface of the dielectric plate in contact with the wastewater. Preferably, the inclination angle of the dielectric plate is greater than 0° and less than 90°. A discharge region is formed at the dielectric plate by setting a first electrode, a power supply, and a second electrode. When the wastewater flows onto the dielectric plate, that is, enters the discharge region, various active substances will be generated in the discharge region, and the various active substances will degrade the wastewater to be degraded, thereby realizing the treatment of the wastewater. A plurality of concave areas are formed on the smooth dielectric plate, and the concave areas can increase the surface area of the dielectric plate relative to the flat area, thereby prolonging the residence time of the wastewater on the dielectric plate. Also, because the relative specific surface area of the dielectric plate with concave areas is much larger than that of a smooth flat plate, the contact area between the wastewater and the active particles in the discharge region can be expanded, greatly improving the pollutant degradation efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] The above and / or additional aspects and advantages of the present application will become apparent and easy to understand from the description of the embodiments in conjunction with the following drawings, where:

[0040] Figure 1 Shows a schematic diagram of the water treatment tank of the present application and its internal structure;

[0041] Figure 2 Shows a schematic diagram of the structure of the water film type dielectric barrier discharge water treatment device of the present application;

[0042] Figure 3 Shows a top view of the water treatment tank of the present application;

[0043] Figure 4 Shows a schematic diagram of a dielectric plate structure of the present application;

[0044] Figure 5 Shows a schematic diagram of another dielectric plate structure of the present application;

[0045] Figure 6 Shows a schematic diagram of another dielectric plate structure of the present application.

[0046] Wherein, Figures 1 to 6 The correspondence between the reference numerals and the component names in the figure is as follows:

[0047] Water treatment tank 1, first water storage area 2, horizontal plate 3, dielectric plates 4, 41, planar area, concave area 42, water outlet 5, second water storage area 6, air outlet 7, electrode member 8, needle-shaped electrode 9, compressor 10, third solenoid valve 11, air inlet 12, first water retaining net 13, second water retaining net 14, second solenoid valve 15, pump body 16, first solenoid valve 17, water inlet 18. Detailed implementation manners

[0048] In order to more clearly understand the above objects, features and advantages of the present application, the present application will be further described in detail below with reference to the drawings and specific implementation manners. It should be noted that, without conflict, the embodiments of the present application and the features in the embodiments can be combined with each other.

[0049] In the following description, many specific details are set forth in order to fully understand the present application. However, the present application can also be implemented in other ways different from those described herein. Therefore, the protection scope of the present application is not limited by the specific embodiments disclosed below.

[0050] Next, refer to Figures 1 to 6 Describe a water film type dielectric barrier discharge water treatment device according to some embodiments of the present application.

[0051] Embodiment

[0052] As Figure 2 , Figure 4 , Figure 5 and Figure 6 shown, this embodiment discloses a water film type dielectric barrier discharge water treatment device, including: a dielectric plate 4, the dielectric plate 4 is inclined, the dielectric plate 4 is provided with a water-facing surface, the water-facing surface includes a plurality of planar areas 41 and concave areas 42 arranged between adjacent two planar areas 41; a first electrode, the first electrode is grounded and is arranged opposite to the water-facing surface; a second electrode, the second electrode is electrically connected to a power supply and is arranged on the side of the dielectric plate 4 away from the water-facing surface.

[0053] Specifically, the dielectric plate 4 is inclined so that the wastewater will flow down from the dielectric plate 4 and form a water film on the surface of the dielectric plate 4. The water-facing surface is the surface of the dielectric plate 4 in contact with the wastewater. Preferably, the inclination angle of the dielectric plate 4 is greater than 0° and less than 90°. A discharge region is formed at the dielectric plate 4 by setting the first electrode, the power supply, and the second electrode. When the wastewater flows onto the dielectric plate 4, that is, enters the discharge region, various active substances will be generated in the discharge region, and the various active substances will degrade the wastewater to be degraded, thereby realizing the treatment of the wastewater. A plurality of concave regions 42 are formed on the smooth dielectric plate 4. The concave regions 42 can increase the surface area of the dielectric plate 4 relative to the planar region 41, thereby prolonging the residence time of the wastewater on the dielectric plate 4. Also, because the relative specific surface area of the dielectric plate 4 with the concave regions 42 is much larger than that of a smooth flat plate, the contact area between the wastewater and the active particles in the discharge region can be enlarged, greatly improving the pollutant degradation efficiency. Preferably, the material of the dielectric plate 4 includes, but is not limited to, alumina ceramics and quartz materials. The power supply is a high-frequency alternating current high-voltage power supply, and the second electrode is an aluminum foil grounding electrode, which is pasted on the side of the dielectric plate 4 away from the water-facing surface. Preferably, a monitoring device is provided between the power supply and the first electrode. The monitoring device includes a voltage probe, a test capacitor, a current probe, and a digital oscilloscope. The monitoring device is used to monitor the current to ensure the stability of the current during the water treatment process.

[0054] As Figure 1 , Figure 2 and Figure 3 shown, further, the first electrode includes: at least one electrode member 8, and the electrode member 8 is electrically connected to the power supply; a plurality of needle-shaped electrodes 9, and the plurality of needle-shaped electrodes 9 are arranged at intervals on the electrode member 8. The electrode member 8 is arranged parallel to the dielectric plate 4, and the needle-shaped electrodes 9 are arranged perpendicular to the dielectric plate 4. The water film type dielectric barrier discharge water treatment device is optimized by the needle-shaped electrodes 9 to concentrate the discharge energy at the needle tips. The number of the electrode member 8 and the needle-shaped electrodes 9 is determined according to the length and width of the dielectric plate 4. Preferably, the electrode member 8 is a columnar stainless steel high-voltage electrode rod, and the needle-shaped electrode 9 includes a ring and a needle body arranged on the ring. The needle-shaped electrode 9 is sleeved on the electrode member 8.

[0055] As Figure 2 shown, further, a plurality of needle-shaped electrodes 9 point to the planar region 41, so that the energy can be automatically pushed from the plane to the concave part, reducing the energy consumption and avoiding energy waste. Specifically, the needle-shaped electrode 9 includes a ring and a needle body arranged on the ring. The intersection point of the extension line of the needle body and the dielectric plate 4 is located in the planar region 41 of the dielectric plate 4. By using the needle body to the planar region 41 between the two concave regions 42, the electric field is enhanced in the planar region 41, and then with the help of the internal fluidity of the concave regions 42, the streamer can be pushed forward during the discharge process with a smaller voltage, reducing the energy consumption during the discharge process. It helps to treat the wastewater more efficiently and environmentally, reduce environmental pollution, and promote sustainable development.

[0056] As Figure 4 , Figure 5 and Figure 6 shown, specifically, the cross-sectional shape of the concave area 42 is arc-shaped; or, the cross-sectional shape of the concave area 42 is rectangular; or, the cross-sectional shape of the concave area 42 is triangular. The specific cross-sectional shape of the concave area 42 is not limited herein, as long as it meets the requirement of increasing the relative specific surface area of the dielectric plate 4. Preferably, the cross-sectional shape of the concave area 42 is arc-shaped.

[0057] As Figure 2 and Figure 3 shown, further, it further includes: a water treatment tank 1, the dielectric plate 4 and the first electrode are both located in the water treatment tank 1; a first water storage area 2, the first water storage area 2 is arranged in the water treatment tank 1; a second water storage area 6, the second water storage area 6 is arranged in the water treatment tank 1; wherein, one end of the dielectric plate 4 is connected to the first water storage area 2, and the other end of the dielectric plate 4 is connected to the second water storage area 6. The dielectric plate 4 is inclinedly arranged in the water treatment tank 1, the first electrode is located in the water treatment tank 1, and a part of the first electrode extends out of the water treatment tank 1. Both the first water storage area 2 and the second water storage area 6 are storage spaces with open upper ends. One end of the dielectric plate 4 is connected to the upper end of the first water storage area 2, and the wastewater overflows from the first water storage area 2 and flows onto the dielectric plate 4. The other end of the dielectric plate 4 is connected to the upper end of the second water storage area 6, and the wastewater flows through the dielectric plate 4 and into the second water storage area 6. Preferably, a horizontal plate 3 is further arranged in the water treatment tank 1. The horizontal plate 3 is flush with the upper end of the second water storage area 6 and is connected to the upper end of the second water storage area 6. The other end of the dielectric plate 4 is connected to the upper end of the second water storage area 6 through the horizontal plate 3.

[0058] Further, it further includes: a water inlet 18, the water inlet 18 communicates with the first water storage area 2; a water outlet 5, the water outlet 5 communicates with the second water storage area 6; a pump body 16, the pump body 16 is connected to the water inlet 18 and the water outlet 5 through a pipeline. After the wastewater flows from the first water storage area 2 to the second water storage area 6, under the action of the pump body 16, it is pumped back from the second water storage area 6 to the first water storage area 2 again, forming a circulating water film on the dielectric plate 4 to achieve the treatment of the wastewater.

[0059] Further, it further includes: a first solenoid valve 17, the first solenoid valve 17 is arranged on the connecting pipeline between the pump body 16 and the water inlet 18; a second solenoid valve 15, the second solenoid valve 15 is arranged on the connecting pipeline between the pump body 16 and the water outlet 5. The connecting pipeline between the pump body 16 and the water inlet 18 is controlled by the first solenoid valve 17, the connecting pipeline between the pump body 16 and the water outlet 5 is controlled by the second solenoid valve 15. By setting the first solenoid valve 17 and the second solenoid valve 15, the liquid circulation of the wastewater can be conveniently controlled, facilitating the adjustment of the wastewater level in the second water storage area 6 and avoiding too high a water level.

[0060] Further, it further includes: a first water retaining net 13, the first water retaining net 13 is arranged adjacent to the dielectric plate 4 in the first water storage area 2; a second water retaining net 14, the second water retaining net 14 is arranged adjacent to the dielectric plate 4 in the second water storage area 6. The first water retaining net 13 is arranged at the top of the first water storage area 2, and the second water retaining net 14 is arranged at the top of the second water storage area 6, so as to reduce water flow fluctuations and avoid excessive flow velocity resulting in waves. Preferably, both the first water retaining net 13 and the second water retaining net 14 are generally L-shaped, and they include a horizontal net arranged in the first water storage area 2 and the second water storage area 6 and a vertical net perpendicular to and connected to the horizontal net, thereby improving the water retaining effect of the first water retaining net 13 and the second water retaining net 14.

[0061] It further includes: an air inlet 12, the air inlet 12 is communicated with the water treatment tank 1; an air outlet 7, the air outlet 7 is communicated with the water treatment tank 1; a compressor 10, the compressor 10 is communicated with the air inlet 12 through a pipeline. Under the action of the compressor 10, gas is discharged from the air inlet 12 into the first water storage area 2, enters the discharge area after passing through the first water retaining net, and blows various active substances in the discharge area into the circulating wastewater to be degraded for degradation treatment, improving the treatment effect.

[0062] Further, it further includes: a third solenoid valve 11, the third solenoid valve 11 is arranged on the communication pipeline between the compressor 10 and the air inlet 12. The third solenoid valve 11 is used to control the communication and closing of the connection channel between the compressor 10 and the air inlet 12.

[0063] In this embodiment, a preferred implementation manner is provided. The water treatment tank 1 in this embodiment has a length of 304 mm, a width of 150 mm, and a height of 180 mm, and the material is acrylic. The dielectric plate 4 is made of alumina ceramic, with a thickness of 3 mm, a length of 10 cm, and a width of 5 cm; there is a semi-circular concave area 42 with a radius of 0.5 mm, and the distance between adjacent two concave areas 42 is 2 mm. The concave area 42 starts 2 cm from the top of the dielectric plate 4 and ends 2 cm from the bottom of the dielectric plate 4. The first electrode is made of stainless steel, the needle-shaped electrode 9 is 10 mm long, and the distance between the tip of the needle-shaped electrode 9 and the dielectric plate 4 is 5 mm; the electrode member 8 is 210 mm long and is fixed on the water treatment tank 1 with an insulating sleeve. There are 1 - 4 electrode members 8, and each electrode member 8 is connected with 1 - 5 needle-shaped electrodes 9. The grounding electrode is an aluminum foil with a length and width each less than 2 cm of the dielectric plate. Air enters the discharge area through the air inlet 12 by the compressor 10, passes through the first water retaining net 13, and blows various active substances in the discharge area into the circulating wastewater to be degraded for degradation treatment. The wastewater to be degraded is connected to the water inlet 18 by the pump body 16, overflows from the first water storage area 2 through the first water retaining net 13, flows into the discharge area through the dielectric plate 4 for degradation, then passes through the second water retaining net 14, flows into the second water storage area 6, and flows into the pump body 16 through the water outlet 5 by a pipeline for circulating treatment.

[0064] Pour 1 L of salicylhydroxamic acid and tetracycline hydrochloride wastewater with a concentration of 60 mg / L into this device respectively. Turn on the compressor 10 to adjust the flow rate to 6 L / min. Air is blown into the discharge area through the air inlet 12 and the first water retaining net 13. Then turn on the power supply, adjust the peak voltage to 16 kV, and the current frequency to 7500 Hz to generate current filaments between the first electrode and the second electrode. Every 5 minutes, open the water treatment tank 1 to take three groups of parallel samples, sample 5 times, and degrade for 20 minutes. Use an ultraviolet spectrophotometer and a high-performance liquid chromatograph to test the concentrations of salicylhydroxamic acid and tetracycline hydrochloride. After 20 minutes of treatment, the degradation efficiency of the ore dressing wastewater containing salicylhydroxamic acid and the biological wastewater containing tetracycline hydrochloride in this device is greater than 40%.

[0065] In this application, the term "a plurality" means two or more, unless otherwise clearly defined. Terms such as "installed", "connected", "connected to", "fixed" and other terms should be understood in a broad sense. For example, "connected" can be a fixed connection, a detachable connection, or an integral connection; "connected" can be directly connected or indirectly connected through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0066] In the description of this specification, the description of terms such as "one embodiment", "some embodiments", "specific embodiments", etc. means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of this application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or instance. Moreover, the specific features, structures, materials or characteristics described can be combined in a suitable manner in any one or more embodiments or examples.

[0067] The above are only the preferred embodiments of this application and are not used to limit this application. For those skilled in the art, this application can have various changes and modifications. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of this application shall be included in the protection scope of this application.

Claims

1. A water film type dielectric barrier discharge water treatment device, characterized in that Comprising: A dielectric plate (4), the dielectric plate (4) is inclined, the dielectric plate (4) is provided with a water-facing surface, and the water-facing surface includes a plurality of planar regions (41) and concave regions (42) disposed between adjacent two of the planar regions (41); A first electrode, the first electrode is grounded, and the first electrode is disposed opposite to the water-facing surface; A second electrode, the second electrode is electrically connected to a power source, and the second electrode is disposed on a side of the dielectric plate (4) away from the water-facing surface.

2. The water film type dielectric barrier discharge water treatment device according to claim 1, characterized in that, The first electrode includes: At least one electrode member (8), the electrode member (8) is electrically connected to the power source; A plurality of needle-shaped electrodes (9), the plurality of needle-shaped electrodes (9) are spaced apart and disposed on the electrode member (8).

3. The water film type dielectric barrier discharge water treatment device according to claim 2, wherein, The plurality of needle-shaped electrodes (9) point to the planar region (41).

4. The water film type dielectric barrier discharge water treatment device according to claim 1, characterized in that The cross-sectional shape of the concave region (42) is arc-shaped; Or, the cross-sectional shape of the concave region (42) is rectangular; Or, the cross-sectional shape of the concave region (42) is triangular.

5. The water film type dielectric barrier discharge water treatment device according to claim 1, characterized in that, Further comprising: A water treatment tank (1), the dielectric plate (4) and the first electrode are both located inside the water treatment tank (1); A first water storage area (2), the first water storage area (2) is disposed inside the water treatment tank (1); A second water storage area (6), the second water storage area (6) is disposed inside the water treatment tank (1); Wherein, one end of the dielectric plate (4) is connected to the first water storage area (2), and the other end of the dielectric plate (4) is connected to the second water storage area (6).

6. The water film type dielectric barrier discharge water treatment device according to claim 5, characterized in that, Further comprising: An inlet (18), the inlet (18) communicates with the first water storage area (2); An outlet (5), the outlet (5) communicates with the second water storage area (6); A pump body (16), the pump body (16) is connected to the inlet (18) and the outlet (5) through a pipeline.

7. The water film type dielectric barrier discharge water treatment device according to claim 6, wherein Further comprising: A first solenoid valve (17), the first solenoid valve (17) is disposed on the connecting pipeline between the pump body (16) and the inlet (18); A second solenoid valve (15), the second solenoid valve (15) is disposed on the connecting pipeline between the pump body (16) and the outlet (5).

8. The water film type dielectric barrier discharge water treatment device according to claim 5, characterized in that, Further comprising: A first water retaining net (13), the first water retaining net (13) is disposed adjacent to the dielectric plate (4) in the first water storage area (2); A second water retaining net (14), the second water retaining net (14) is disposed adjacent to the dielectric plate (4) in the second water storage area (6).

9. The water film type dielectric barrier discharge water treatment device according to claim 5, characterized in that Further comprising: An air inlet (12), the air inlet (12) communicates with the water treatment tank (1); An air outlet (7), the air outlet (7) communicates with the water treatment tank (1); A compressor (10), the compressor (10) is connected to the air inlet (12) through a pipeline.

10. The water film type dielectric barrier discharge water treatment device according to claim 9, characterized in that, Further comprising: A third solenoid valve (11), the third solenoid valve (11) is disposed on the communicating pipeline between the compressor (10) and the air inlet (12).

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