WO2021012468A1 - Ultraviolet light-emitting diode-non-thermal plasma combined disinfection device and method - Google Patents

Abstract

An ultraviolet light-emitting diode-non-thermal plasma combined disinfection device. Said disinfection device comprises an ultraviolet light-emitting device, a plasma generation device, and a water inlet assembly, a water treatment tank (11) and a water outlet assembly which are sequentially connected, the tank bottom of the water treatment tank (11) being transparent. The ultraviolet light-emitting device comprises UVC-LED lamp beads (5), a UVC-LED driver (6) and a UVC-LED control switch (7) which are sequentially connected. The UVC-LED lamp beads (5) are provided below the water treatment tank (11). The plasma generation device comprises a plasma control panel (15) and an oil-free air compressor (17), a ventilation pipe (13), a gas ionization chamber (12) and a plasma rotary nozzle (10) which are sequentially connected. The plasma control panel (15) is electrically connected to the gas ionization chamber (12). The plasma rotary nozzle (10) is provided in the water treatment tank (11) and is located right above the UVC-LED lamp beads (5). The synergy of UVC-LED and non-thermal plasma is realized, and the problem of insufficient sterilization of UVC-LED is solved. Also disclosed is an ultraviolet light-emitting diode-non-thermal plasma combined disinfection method.

Description

Ultraviolet light emitting diode-non-thermal plasma combined disinfection device and method Technical field

The invention relates to the technical field of sewage disinfection, in particular to an ultraviolet light emitting diode-non-thermal plasma combined disinfection device and method.

Background technique

Ultraviolet rays (UVC or UV) are currently used in the field of sewage treatment to disinfect sewage. Ultraviolet rays in the general water treatment process are generated by low-pressure mercury lamps, low-pressure high-intensity mercury lamps and medium-pressure mercury lamps through electrode discharge. The electrode mercury lamp currently used for starting is wrapped in glass, which is very fragile, has a short working life, consumes a lot of energy, contains toxic mercury, and is easy to leak into the environment and cause environmental damage.

In recent years, ultraviolet light emitting diodes (UVC-LED) have begun to be developed for environmental water treatment. The UVC-LED lamp has no toxic substance mercury, has a long life and is not affected by the number of times of switching, and UVC-LED is electroluminescent, direct electro-optical conversion, low energy conversion loss, and power consumption in standby can reach zero.

On the one hand, UVC can directly damage the DNA of microorganisms and produce pyrimidine dimers, leading to the death of microorganisms. On the other hand, UVC irradiates water molecules to generate a large amount of reactive oxygen radicals (ROS), such as hydroxyl radicals (·OH), Hydrogen peroxide (H ₂ O ₂ ), etc., can oxidize the DNA, protein, cell membrane, etc. of microbial cells, leading to the death of microbes. However, since the disinfection effect of UVC-LED is related to its penetration rate, there is a problem of insufficient disinfection.

Non-thermal plasma is an emerging broad-spectrum sterilization technology, which has the characteristics of rapid, safe, simple, comprehensive and effective killing of microorganisms, and has broad application prospects in water disinfection, food processing, medicine and hygiene, etc. Plasma can be generated by ionized gas. Plasma is a mixture and contains a variety of active materials, such as charged particles (electrons and ions), free radicals (active oxygen and active nitrogen), and UVC irradiation. Various active materials are dissolved in water It can destroy the cell wall, cell membrane, nucleic acid, protein, etc. of pathogenic bacteria, so as to achieve the purpose of rapid sterilization.

The patent specification with publication number CN 103894377 A discloses a combined ultraviolet light and plasma cleaner, including a cleaner body, a plasma generator, and an ultraviolet light generator. The lower part of the cleaner body is a cleaning platform; the plasma generator is set up On the main body of the washer; an ultraviolet light generator is arranged at the lower part of the main body of the washer, and the ultraviolet light generator includes a control box, an electronic ballast, and is arranged in the control box and is connected to the electronic ballast. At least one ultraviolet light tube electrically connected to the cleaner; wherein the lower part of the cleaner body is also provided with a first air duct and a second air duct, and is provided with an electric valve, and the first air duct is coated with a cooling Floor. In the combined ultraviolet light and plasma cleaner, the object to be cleaned is placed on the cleaning platform, the plasma generator is turned on by the controller, and the cleaning object is cleaned, and then the ultraviolet light generator is turned on by the controller, and the ultraviolet light The tube performs secondary cleaning and sterilization of the objects to be cleaned. The controller controls the valve to open the first air duct. The operation of the ultraviolet light generator will cause the temperature in the washer to rise, heat dissipation through the radiator, and the air in the washer passes through the first air duct. Cool down at time and exchange with the outside to stabilize the temperature in the washer. The objects to be cleaned after two-step cleaning meet the requirements of cleanliness, and after ultraviolet light sterilization, the exhaust gas is not polluted. In addition, a suspension rack is provided on the cleaning platform, which can make the objects to be cleaned in multi-directional three-dimensional cleaning, and the cleaning effect is better.

Summary of the invention

In view of the shortcomings in the field, the present invention provides a combined ultraviolet light emitting diode-non-thermal plasma disinfection device, which realizes the synergistic effect of UVC-LED and non-thermal plasma, and solves the inadequate sterilization of UVC-LED To achieve the problem of generating a large number of free radicals in a short time, thereby fully killing microorganisms, achieving the purpose of efficient sewage disinfection and low energy consumption.

An ultraviolet light emitting diode-non-thermal plasma combined disinfection device, comprising an ultraviolet light emitting device, a plasma generating device, and a water inlet component, a water treatment tank and a water outlet component connected in sequence, the bottom of the water treatment tank is transparent;

The ultraviolet light emitting device includes a UVC-LED lamp bead, a UVC-LED driver and a UVC-LED control switch that are connected in sequence, and the UVC-LED lamp bead is arranged under the water treatment tank;

The plasma generating device includes a plasma control panel, an oil-free air compressor, a vent pipe, a gas ionization chamber, and a plasma rotating nozzle connected in sequence, the plasma control panel is electrically connected to the gas ionization chamber, and the plasma The body rotating nozzle is arranged in the water treatment tank and directly above the UVC-LED lamp beads.

The device of the present invention improves the space utilization rate and meets the characteristics of a small integrated sewage treatment equipment. The UVC-LED lamp beads below the water treatment tank generate ultraviolet rays, and cooperate with the plasma sprayed by the plasma rotating nozzle directly above to achieve coordinated sterilization and disinfection of the water in the water treatment tank.

Preferably, the water treatment tank is connected to the water inlet assembly through a water inlet, and is connected to the water outlet assembly through a water outlet, the water inlet is lower than the bottom end of the plasma rotary nozzle, and the water outlet is provided in the water treatment tank. bottom. This design does not cause water to enter the plasma rotating nozzle, and the water does not produce resistance to the plasma ejection, and the treated water in the water treatment tank can be completely emptied.

Preferably, the water inlet assembly includes a water inlet valve, a membrane filter assembly and a water inlet pump with a flow control unit connected in sequence. The water inlet pump is connected to the water treatment tank and can perform preliminary filtration and flow of the inlet water. control.

Preferably, a stirring paddle is provided at the bottom of the water treatment tank and directly above the UVC-LED lamp beads, which can fully mix the sewage in the water treatment tank and promote the free radical reaction generated in the sewage and water.

Preferably, the water outlet assembly includes a water outlet valve.

Preferably, the oil-free air compressor is equipped with a gas flow regulating valve, which can control the injection volume of non-thermal plasma and meet the disinfection requirements of different types of sewage.

Preferably, the bottom of the water treatment tank is a waterproof quartz glass panel, and the UVC-LED lamp beads are arranged under the quartz glass panel, which can prevent the problem of scaling when the UVC-LED lamp beads are immersed in water.

Preferably, the ultraviolet light emitting device includes a plurality of UVC-LED lamp beads;

The UVC-LED lamp beads are grouped and connected in parallel to the circuit, and the UVC-LED lamp beads in each group are connected in series.

More preferably, the parallel circuits of UVC-LED lamp beads are independent of each other, and they are all controlled by the UVC-LED control switch to adjust the intensity of ultraviolet light irradiation.

An ultraviolet light-emitting diode-non-thermal plasma combined disinfection method, using the ultraviolet light-emitting diode-non-thermal plasma combined disinfection device, includes: adding sewage to a water treatment tank, turning on a plasma control panel and UVC- The LED driver adjusts the plasma working power and processing time, adjusts the irradiation intensity and irradiation time of the UVC-LED lamp beads, and discharges the treated sewage after the treatment is completed.

The oil-free air compressor provides compressed air, enters the gas ionization chamber through the vent pipe to generate plasma, and finally ejects it through the plasma rotating nozzle, which cooperates with the ultraviolet radiation emitted by the UVC-LED lamp beads to perform the treatment on the water in the water treatment tank. Disinfection.

Preferably, the plasma working power is 600 to 900 W, and the processing time is 3 to 10 minutes.

Preferably, the irradiation intensity is 1.7 to 2.5 W/m ² , and the irradiation time is 3 to 10 min.

Compared with the prior art, the main advantages of the present invention include:

(1) The present invention organically combines UVC-LED and non-thermal plasma. Non-thermal plasma generates a large amount of nitroxide free radicals and UVC light reaction. Water generates oxygen free radicals and simultaneously reacts with microorganisms in the water to enhance the free radical effect in a short time. , So as to achieve a synergistic sterilization effect under the condition of low loss.

(2) Setting the UVC-LED lamp beads outside the water treatment tank (such as embedded in waterproof quartz glass) can solve the scaling problem caused by the UVC-LED lamp beads immersed in water.

Description of the drawings

FIG. 1 is a schematic structural diagram of an ultraviolet light emitting diode-non-thermal plasma combined disinfection device of an embodiment;

2 is a schematic top view of the bottom surface of the water treatment tank of the ultraviolet light emitting diode-non-thermal plasma combined disinfection device of the embodiment;

3 is a schematic diagram of the circuit connection of the ultraviolet light emitting device of the ultraviolet light emitting diode-non-thermal plasma combined disinfection device of the embodiment;

4 is a schematic diagram of the structure of the UVC-LED control switch of the ultraviolet light emitting diode-non-thermal plasma combined disinfection device of the embodiment;

5 is a schematic diagram of the structure of the gas ionization chamber of the ultraviolet light emitting diode-non-thermal plasma combined disinfection device of the embodiment;

In the picture: water inlet valve 1; membrane filter assembly 2; flow control unit 3; high-pressure diaphragm pump 4; UVC-LED lamp beads 5; UVC-LED driver 6; UVC-LED control switch 7; waterproof quartz glass bottom plate 8; stirring Paddle 9; plasma rotating nozzle 10; water treatment tank 11; gas ionization chamber 12; vent pipe 13; cable 14; plasma control panel 15; gas flow regulating valve 16; oil-free air compressor 17; water outlet valve 18; UVC -LED lamp bead switch 19; sliding rheostat 20; water inlet 21; water outlet 22; gas ionization copper electrode 23.

Detailed ways

The present invention will be further explained below in conjunction with the drawings and specific embodiments. It should be understood that these embodiments are only used to illustrate the present invention and not to limit the scope of the present invention. The operating methods without specific conditions in the following examples are usually in accordance with conventional conditions or in accordance with the conditions recommended by the manufacturer.

As shown in Fig. 1, the ultraviolet light emitting diode-non-thermal plasma combined disinfection device of this embodiment includes an ultraviolet light emitting device, a plasma generating device, and a water inlet assembly, a water treatment tank 11, and a water outlet assembly connected in sequence.

The water treatment tank 11 is made of quartz glass and has a cylindrical shape, and the bottom of the tank is a transparent waterproof quartz glass bottom plate 8. A water inlet 21 is provided at the upper part of one side of the water treatment tank 11, and a water outlet 22 is provided at the bottom of the opposite side. A stirring paddle 9 is provided in the center of the bottom of the water treatment tank 11.

The water inlet assembly includes a water inlet valve 1, a membrane filter assembly 2 and a high-pressure diaphragm pump 4 with a flow control unit 3 connected in sequence. The water outlet end of the high-pressure diaphragm pump 4 is connected to the water inlet 21 of the water treatment tank 11.

The water outlet assembly includes a water outlet valve 18 connected to the water outlet 22 of the water treatment tank 11.

The ultraviolet light emitting device includes a UVC-LED lamp bead 5, a UVC-LED driver 6 and a UVC-LED control switch 7 which are sequentially connected, and the UVC-LED lamp bead 5 is arranged under the waterproof quartz glass base plate 8.

As shown in Figure 2, there are a total of 8 UVC-LED lamp beads 5, which are divided into three rows (ie, three groups) around the stirring paddle 9. There are two rows on both sides of the stirring paddle 9 symmetrical, with 3 in each row. There are two in the same row as the stirring paddle 9, with the stirring paddle 9 as the center, arranged on both sides. Such uniformly distributed UVC-LED lamp beads can provide uniform ultraviolet radiation.

As shown in Figure 3, the UVC-LED lamp beads 5 are grouped and connected in parallel to the circuit, and the UVC-LED lamp beads 5 in each group are connected in series. The parallel circuits of the UVC-LED lamp beads 5 are independent of each other, and each parallel branch circuit is controlled by a UVC-LED lamp bead switch 19 and a sliding rheostat 20 to control the switching and irradiation intensity of ultraviolet rays.

As shown in FIG. 4, three UVC-LED lamp bead switches 19 and three sliding rheostats 20 are integrated on one UVC-LED control switch 7.

The plasma generating device includes a plasma control panel 15 and a gas flow regulating valve 16, an oil-free air compressor 17, a vent pipe 13, a gas ionization chamber 12 and a plasma rotating nozzle 10 connected in sequence. The plasma control panel 15 and the gas ionization chamber 12 are connected by a cable 14 to control the plasma power. The gas flow regulating valve 16 regulates the flow of compressed air, thereby controlling the amount of plasma injection.

The plasma rotary shower head 10 is arranged in the upper part of the water treatment tank 11 and directly above the UVC-LED lamp beads 5. The bottom end of the plasma rotary shower head 10 is higher than the water inlet 21.

The bottom of the gas ionization chamber 12 communicates with the top of the plasma rotary shower head 10, and the top communicates with the vent pipe 13. The gas ionization chamber 12 is located above the plasma rotary shower head 10, and is fixed in position by a beam on the top of the water treatment tank 11. As shown in FIG. 5, the gas ionization chamber 12 is provided with two vertically symmetrical gas ionization copper electrodes 23, and the gas ionization copper electrodes 23 are connected to the plasma control panel 15 through a cable 14 to form an electric field. After the compressed air provided by the oil-free air compressor 17 enters the gas ionization chamber 12 through the vent pipe 13, it passes through the area formed between the two gas ionized copper electrodes 23, is ionized by the electric field to form plasma, and enters the plasma rotating nozzle 10 below. , And finally sprayed out, contacting the water body in the water treatment tank 11.

The ultraviolet light emitting diode-non-thermal plasma combined disinfection device improves the space utilization rate and meets the characteristics of a small integrated sewage treatment equipment. The UVC-LED lamp beads 5 below the water treatment tank 11 generate ultraviolet rays, which cooperate with the plasma sprayed by the plasma rotating nozzle 10 directly above to achieve coordinated sterilization and disinfection of the water body in the water treatment tank 11.

Using the above-mentioned ultraviolet light-emitting diode-non-thermal plasma combined disinfection device to perform ultraviolet light-emitting diode-non-thermal plasma combined disinfection includes: adding sewage to the water treatment tank 11, turning on the plasma control panel 15 and the UVC-LED driver 6 , Adjust the plasma working power and treatment time, adjust the irradiation intensity and irradiation time of the UVC-LED lamp beads 5, and discharge the treated sewage after the treatment is completed.

Test case 1

Using the ultraviolet light-emitting diode-non-thermal plasma combined disinfection device of the embodiment to treat sewage, the COD in the sewage is 400mg/L, BOD is 200mg/L, pH 6-9, suspended solids 2000mg/L, the specific treatment method is:

(1) Adjust the total amount of sewage to 60mL through the flow control unit 3, open the inlet valve 1, and the sewage flows into the water treatment tank 11. After the sewage volume reaches the set volume, the inlet valve 1 and the flow control unit 3 are closed .

(2) Adjust the UVC-LED driver 6 and the UVC-LED control switch 7, and set the irradiation intensity of the UVC-LED lamp beads 5 to 2.5W/m ² , and the irradiation time is 6 minutes.

(3) Control the plasma control panel 15 to turn on the plasma generator, adjust the plasma generating power to 600W, and the processing time for 6 minutes.

(4) After the UVC-LED and plasma co-processing is completed, turn off the UVC-LED control switch 7 and the plasma control panel 15 to drain the treated sewage.

Test case 2

The plasma control panel 15 of the ultraviolet light-emitting diode-non-thermal plasma combined disinfection device of the embodiment is closed, that is, the UVC-LED lamp beads 5 are used to disinfect the sewage, and the other conditions are the same as those in Test Example 1.

Test case 3

The UVC-LED control switch 7 of the ultraviolet light emitting diode-non-thermal plasma combined disinfection device of the embodiment is turned off, that is, the sewage is disinfected with plasma alone, and the remaining conditions are the same as those in Test Example 1.

Test case 4

The total amount of sewage added in step (1) of Test Example 1 was adjusted to 120 mL, and other conditions were the same as Test Example 1.

Test case 5

The irradiation intensity of the UVC-LED lamp bead 5 in step (2) of Test Example 1 is set to 1.7 W/m ² , and the other conditions are the same as Test Example 1.

The number of E. coli colonies in the treated sewage of Test Examples 1 to 5 is shown in Table 1.

Table 1

sample	Number of colonies (log 10 CFU/mL)
Untreated sewage	7.02±0.02
Test case 1	not detected
Test case 2	6.70±0.20
Test case 3	6.00±0.40
Test case 4	4.28±0.12
Test case 5	not detected

It can be seen from the data in Table 1 that the combined treatment of UVC-LED and plasma (Test Example 1) can completely remove the E. coli flora in the sewage to an undetected level. Treatment of sewage with UVC-LED alone (Test Example 2) can achieve 0.32 log ₁₀ (CFU/mL) of E. coli flora removal, and ultrasonic treatment of sewage (Test Example 3) can achieve 1.02 log ₁₀ (CFU/mL) The amount of E. coli flora removed. Therefore, the combined treatment of sewage with UVC-LED and plasma can achieve a synergistic sterilization effect. In addition, by adjusting the sewage treatment volume (Test Example 4) and UVC-LED ultraviolet radiation intensity (Test Example 5) to achieve different sterilization effects for different sewage.

In addition, it should be understood that after reading the above description of the present invention, those skilled in the art can make various changes or modifications to the present invention, and these equivalent forms also fall within the scope defined by the appended claims of the present application.

Claims (10)

1. An ultraviolet light emitting diode-non-thermal plasma combined disinfection device, comprising an ultraviolet light emitting device, a plasma generating device, and a water inlet assembly, a water treatment tank, and a water outlet assembly that are sequentially connected, characterized in that the water treatment tank Transparent bottom

   The ultraviolet light emitting device includes a UVC-LED lamp bead, a UVC-LED driver and a UVC-LED control switch that are connected in sequence, and the UVC-LED lamp bead is arranged under the water treatment tank;

   The plasma generating device includes a plasma control panel, an oil-free air compressor, a vent pipe, a gas ionization chamber, and a plasma rotating nozzle connected in sequence, the plasma control panel is electrically connected to the gas ionization chamber, and the plasma The body rotating nozzle is arranged in the water treatment tank and directly above the UVC-LED lamp beads.
2. The ultraviolet light emitting diode-non-thermal plasma combined disinfection device according to claim 1, wherein the water treatment tank is connected to the water inlet assembly through a water inlet, and is connected to the water outlet assembly through a water outlet, and the inlet The water outlet is lower than the bottom end of the plasma rotary nozzle, and the water outlet is arranged at the bottom of the water treatment tank.
3. The ultraviolet light-emitting diode-non-thermal plasma combined disinfection device according to claim 1, wherein the water inlet assembly comprises a water inlet valve, a membrane filter assembly and a water inlet pump with a flow control unit connected in sequence , The water inlet pump is connected with the water treatment tank.
4. The ultraviolet light emitting diode-non-thermal plasma combined disinfection device according to claim 1, wherein a stirring paddle is provided at the bottom of the water treatment tank and directly above the UVC-LED lamp beads.
5. The ultraviolet light emitting diode-non-thermal plasma combined disinfection device according to claim 1, wherein the water outlet component includes a water outlet valve.
6. The ultraviolet light emitting diode-non-thermal plasma combined disinfection device according to claim 1, wherein the oil-free air compressor is provided with a gas flow regulating valve.
7. The ultraviolet light emitting diode-non-thermal plasma combined disinfection device according to claim 1, wherein the ultraviolet light emitting device comprises a plurality of UVC-LED lamp beads;

   The UVC-LED lamp beads are grouped and connected in parallel to the circuit, and the UVC-LED lamp beads in each group are connected in series.
8. The ultraviolet light emitting diode-non-thermal plasma combined disinfection device according to claim 7, wherein the parallel circuits of UVC-LED lamp beads are independent of each other, and they are all controlled by the UVC-LED control switch.
9. An ultraviolet light-emitting diode-non-thermal plasma combined disinfection method, characterized in that the use of the ultraviolet light-emitting diode-non-thermal plasma combined disinfection device according to any one of claims 1 to 8, includes: water treatment Fill the tank with sewage, turn on the plasma control panel and UVC-LED driver, adjust the plasma working power and processing time, adjust the irradiation intensity and irradiation time of the UVC-LED lamp beads, and discharge the treated sewage after the treatment is completed.
10. The ultraviolet light emitting diode-non-thermal plasma combined disinfection method according to claim 9, wherein the plasma working power is 600-900W, and the processing time is 3-10min;

    The irradiation intensity is 1.7 to 2.5 W/m ² , and the irradiation time is 3 to 10 minutes.

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