Microwave synchronously mediated perforation and electrodeless ultraviolet continuous water disinfection device and method

Abstract

The present invention belongs to the technical field of water treatment and wastewater treatment, and provides a microwave synchronously mediated electroporation and electrodeless ultraviolet continuous water flow disinfection device and method. The continuous water flow disinfection device includes an electrodeless ultraviolet lamp, a microwave source, an air cooling device, a single-ridge waveguide, a lampshade and a quartz water pipe; the single-ridge waveguide includes a single-ridge resonant cavity, the bottom of the single-ridge resonant cavity is provided with an upwardly protruding rectangular ridge, and the top of the single-ridge resonant cavity is provided with a strip-shaped gap; the electrodeless ultraviolet lamp is arranged along the strip-shaped gap, and the quartz water pipe runs through the single-ridge resonant cavity. The part of the quartz water pipe in the single-ridge resonant cavity is recorded as a disinfection section, and the disinfection section is located above the rectangular ridge and within the irradiation range of the electrodeless ultraviolet lamp; the microwave source feeds microwaves into the single-ridge resonant cavity through a coaxial cable, a waveguide coaxial converter and an impedance converter. The present invention can achieve the synergistic disinfection of the electroporation effect and ultraviolet rays on the continuous flow water body, and enhance the water disinfection effect of the prior art.

Description

Technical Field

[0001] The invention belongs to the technical field of water treatment and wastewater treatment, and relates to a microwave synchronously mediated electroperforation and electrodeless ultraviolet continuous flow water disinfection device and method. Background Art

[0002] Disinfection is a necessary process to ensure water quality safety and is an important part of water treatment and wastewater treatment. Currently, the methods used for water disinfection mainly include chemical disinfectant disinfection and physical disinfection. Chemical disinfectants include chlorine, ozone, etc., which will produce carcinogenic disinfection by-products during the water disinfection process, which will have an adverse effect on human health and ecological safety. Physical disinfection processes such as ultraviolet rays and electroporation are widely used in the field of water disinfection because of their better safety.

[0003] Microwave electrodeless ultraviolet disinfection is a physical water disinfection technology that has received widespread attention. Under the excitation of high-frequency electromagnetic waves, the gas filled in the electrodeless ultraviolet lamp discharges, causing electrons to collide with gas atoms and increase their energy levels, thereby generating ultraviolet rays to disinfect microorganisms in the water. Compared with traditional extreme ultraviolet lamps such as low-pressure mercury lamps, microwave electrodeless ultraviolet lamps do not have the problem of electrode aging. Using microwave electrodeless ultraviolet lamps for water disinfection has the characteristics of high stability, long service life of ultraviolet lamps, and high processing efficiency. However, ultraviolet rays alone lack the ability to continuously disinfect. The easy photoreactivation of microorganisms in the water after ultraviolet irradiation is the current technical bottleneck of ultraviolet water disinfection, and microorganisms are also prone to tolerance to ultraviolet rays.

[0004] Electroporation disinfection is another physical water disinfection technology besides ultraviolet disinfection, which includes reversible electroporation and irreversible electroporation. Electroporation relies on a strong electric field to destroy the external structure of pathogens, such as bacterial cell membranes and viral capsids. When the applied electric field strength is lower than the electric field threshold of the cell membrane, reversible electroporation will occur in the bacterial cells, which allows the cells to repair their phospholipid bilayers and restore normal function; when the applied electric field strength is higher than the electric field threshold of the cell membrane, the bacterial cell membrane will be permanently permeable, the cells cannot be repaired, and will eventually die due to the loss of internal and external balance of the cell. Unlike ultraviolet disinfection, electroporation disinfection does not cause tolerance in microorganisms. The most widely used electroporation disinfection technology at present is high-voltage pulse disinfection, which is usually carried out under the conditions of a pulse electric field of 12~100 kV / cm and a pulse time of microseconds. It has the disadvantages of high energy consumption and large equipment size, and is difficult to be applied to continuous water disinfection.

[0005] The existing microwave electrodeless ultraviolet water disinfection device is to set the electrodeless ultraviolet lamp in a rectangular microwave resonant cavity, and use microwaves to excite the electrodeless ultraviolet lamp to generate ultraviolet rays for water disinfection. However, in this process, the electric field strength in the rectangular microwave resonant cavity cannot reach the level of the electroporation effect, so it is impossible to use microwaves to produce the electroporation disinfection effect. At the same time, the existing microwave electrodeless ultraviolet disinfection device based on the rectangular microwave resonant cavity requires a high-power microwave source to be fed in to generate ultraviolet rays. There is a problem of excessive energy consumption for water disinfection, which is not conducive to reducing the cost of water disinfection. Therefore, how to solve the problems of low microwave energy utilization efficiency and easy microbial photoreactivation in the existing ultraviolet water disinfection device, as well as the problem that high-voltage pulse disinfection technology is not conducive to reducing the cost of water disinfection and is difficult to achieve continuous water disinfection, is a major problem faced by the field of water disinfection. Summary of the invention

[0006] In view of the problems that existing ultraviolet water disinfection devices cannot use microwaves to produce electroporation effect, microorganisms are prone to photoreactivation and have high energy consumption, and the problem that existing high-pressure pulse sterilization technology is difficult to use for continuous water disinfection, the present invention provides a microwave synchronously mediated electroporation and electrodeless ultraviolet continuous flow water disinfection device and method, so as to achieve the synergistic disinfection of the electroporation effect and ultraviolet rays on the continuous flow water body, and enhance the water disinfection effect of the existing technology.

[0007] In order to achieve the above-mentioned invention object, the technical solution adopted by the present invention is as follows:

[0008] A microwave synchronously mediated perforation and electrodeless ultraviolet continuous water flow disinfection device, comprising an electrodeless ultraviolet lamp tube, a microwave source, an air cooling device, a single-ridge waveguide, a lampshade and a quartz water pipe;

[0009] The single-ridge waveguide includes a waveguide coaxial converter, an impedance converter, a single-ridge resonant cavity and an adjustable short-circuit surface, wherein a rectangular ridge protruding upward is provided at the bottom of the single-ridge resonant cavity, a strip-shaped gap is provided at the top of the single-ridge resonant cavity, the strip-shaped gap and the rectangular ridge are both arranged along the length direction of the single-ridge resonant cavity, and the adjustable short-circuit surface is arranged at the terminal end of the single-ridge resonant cavity;

[0010] The electrodeless ultraviolet lamp is arranged along the strip gap; the quartz water pipe is arranged to penetrate the single-ridge resonant cavity, the water inlet and the water outlet of the quartz water pipe are located outside the single-ridge resonant cavity, and the part of the quartz water pipe in the single-ridge resonant cavity is recorded as a disinfection section, which is located above the rectangular ridge and within the irradiation range of the electrodeless ultraviolet lamp; the lampshade is arranged outside the electrodeless ultraviolet lamp so that the electrodeless ultraviolet lamp is in the space formed by the lampshade and the single-ridge resonant cavity, one end of the lampshade is connected to the air cooling device, and the other end of the lampshade is provided with an air outlet;

[0011] The microwave source feeds microwaves into the single-ridge resonant cavity through a coaxial cable, a waveguide coaxial converter and an impedance converter.

[0012] In the technical solution of the above-mentioned continuous flow water disinfection device, the electromagnetic field mode of the single-ridge waveguide is similar to that of the rectangular waveguide, and the main difference is that near the rectangular ridge of the single-ridge resonant cavity of the single-ridge waveguide, the field distribution is disturbed due to the edge effect, and the electromagnetic wave is bound here, which can effectively increase the electric field strength in the single-ridge resonant cavity, especially the electric field strength near the rectangular ridge of the single-ridge resonant cavity. Therefore, the disinfection section of the quartz water pipe is preferably located directly above the rectangular ridge, so that the disinfection section of the quartz water pipe is located in the area with higher electric field strength in the single-ridge resonant cavity.

[0013] In the technical solution of the continuous flow water disinfection device, when the adjustable short-circuit surface is controlled to move along the length direction of the single-ridge resonant cavity, the phase of the microwave in the single-ridge resonant cavity can be adjusted, and then the electric field distribution in the single-ridge resonant cavity can be adjusted, so that when the microwave source is turned on, the electric field intensity in most of the space of the disinfection section of the quartz water pipe exceeds 10 5 For example, by adjusting the adjustable short-circuit, when the microwave source is turned on, the electric field intensity of at least 50% of the space in the disinfection section of the quartz water pipe can exceed 10 5 V / m.

[0014] In the technical solution of the above-mentioned continuous flow water disinfection device, in order to reduce microwave leakage and improve microwave utilization efficiency, the ratio of the width of the strip-shaped gap to the diameter of the electrodeless ultraviolet lamp tube is preferably (0.4-1.2): 1. Furthermore, the electrodeless ultraviolet lamp tube is preferably located outside the single-ridge resonant cavity and partially embedded in the strip-shaped gap. The electrodeless ultraviolet lamp tube can be partially embedded in the strip-shaped gap by the support of the support frame.

[0015] In the technical solution of the above-mentioned continuous flow water disinfection device, the ratio of the width of the rectangular ridge to the width of the single-ridge resonant cavity is preferably (0.3~0.5):1, and the ratio of the height of the rectangular ridge to the height of the single-ridge resonant cavity is preferably (0.2~0.4):1.

[0016] In the technical solution of the above-mentioned continuous flow water disinfection device, the disinfection section of the quartz water pipe is a straight pipe or a serpentine pipe. When the disinfection section of the quartz water pipe is a straight pipe, the inner diameter of the straight pipe is preferably not more than the width of the rectangular ridge of the single-ridge resonant cavity; when the disinfection section of the quartz water pipe is a serpentine pipe, the spiral diameter of the serpentine pipe (the dimension of the widest part of the spiral of the serpentine pipe) is preferably not more than the width of the rectangular ridge of the single-ridge resonant cavity. Compared with a straight pipe, a serpentine pipe can increase the residence time of water flow in a single-ridge resonant cavity and enhance the water disinfection effect. In practical applications, the structural form of the disinfection section of the quartz water pipe can be selected according to specific water disinfection requirements.

[0017] In the technical solution of the above-mentioned continuous flow water disinfection device, the inner wall of the lampshade is provided with an ultraviolet reflection material coating, and the ultraviolet reflection coating layer is used to reflect the ultraviolet rays emitted by the electrodeless ultraviolet lamp tube back into the single-ridge resonant cavity. By reflecting the ultraviolet rays by the ultraviolet reflection material coating arranged on the inner wall of the lampshade, the utilization rate of the ultraviolet rays can be increased, and the corrosion resistance and stability of the inner wall of the lampshade can also be improved, thereby playing a role in protecting the lampshade. The material of the ultraviolet reflection material coating layer is an existing ultraviolet reflection material, for example, it can be titanium powder whose main component is TiO2. The material of the lampshade is preferably a corrosion-resistant and heat-resistant material, for example, it can be a metal, an alloy, etc.

[0018] In the technical solution of the above-mentioned continuous flow water disinfection device, the lampshade is detachably covered outside the electrodeless ultraviolet lamp tube. In addition, the electrodeless ultraviolet lamp tube is not completely embedded in the single-ridge resonant cavity. This structural design is conducive to the maintenance and replacement of the electrodeless ultraviolet lamp tube.

[0019] In the technical solution of the above-mentioned continuous flow water disinfection device, in order to allow the disinfection section of the quartz water tube to fully receive ultraviolet radiation, it is preferred to set the strip gap directly above the rectangular ridge.

[0020] In the technical solution of the above-mentioned continuous flow water disinfection device, the length of the electrodeless ultraviolet lamp tube is preferably consistent with the length of the strip gap, and the length of the strip gap does not exceed the length of the single-ridge resonant cavity. The length of the strip gap is preferably equal to the length of the single-ridge resonant cavity.

[0021] In the technical solution of the above-mentioned continuous flow water disinfection device, the length of the single-ridge resonant cavity is at least 15 cm. For example, the length of the single-ridge resonant cavity can be 15~200 cm.

[0022] In the technical solution of the above-mentioned continuous flow water disinfection device, the microwave source is a solid-state microwave source, and the power of the microwave source can usually be 50~1000W.

[0023] In the technical solution of the above-mentioned continuous flow water disinfection device, the water inlet of the quartz water pipe is connected to the water inlet pump through a control valve, and the water to be disinfected is input into the quartz water pipe through the water inlet pump.

[0024] In the technical solution of the above-mentioned continuous flow water disinfection device, the air cooling device is provided to cool the electrodeless ultraviolet lamp to avoid the problem of light power reduction due to excessive temperature of the electrodeless ultraviolet lamp. The air cooling device can be a fan, a blower, etc.

[0025] Based on the above microwave synchronous mediated perforation and electrodeless ultraviolet continuous water flow disinfection device, the present invention also provides a microwave synchronous mediated perforation and electrodeless ultraviolet continuous water flow disinfection method, which uses the above microwave synchronous mediated perforation and electrodeless ultraviolet continuous water flow disinfection device, and the steps are as follows:

[0026] The microwave source and air cooling device of the microwave synchronous dielectric perforation and electrodeless ultraviolet continuous water disinfection device are turned on, and the electric field distribution in the single-ridge resonant cavity is adjusted by the adjustable short-circuit surface, so that the electric field intensity of at least 50% of the space in the disinfection section of the quartz water pipe exceeds 10 5 V / m, the microwave in the single-ridge resonant cavity excites the electrodeless ultraviolet lamp to produce ultraviolet rays; the water to be disinfected is continuously introduced into the quartz water pipe from the water inlet and continuously discharged from the water outlet. When the water flows through the disinfection section of the quartz water pipe, the intensity in the area where the quartz water pipe is set in the single-ridge resonant cavity is higher than 10 5 The electric field of V / m and ultraviolet light produce electroporation-ultraviolet light synergistic disinfection effect on water bodies.

[0027] In the technical solution of the above-mentioned continuous flow water disinfection method, in order to ensure the disinfection effect on the water body, it is best to control the flow rate of the water body in the quartz water tube to not exceed 200 mL / min. For example, the flow rate of the water body in the quartz water tube can be controlled to be 50~200 mL / min.

[0028] In the technical solution of the above-mentioned continuous flow water disinfection method, in order to enhance the disinfection effect on the water body, the water outlet of the quartz water pipe can be circulated to the water inlet of the quartz water pipe to perform multiple cycles of disinfection on the water body. In practical applications, whether multiple cycles of disinfection are required and the number of cycles of the cyclic disinfection can be determined based on factors such as the type and content of microorganisms in the water body to be disinfected.

[0029] In the technical solution of the above-mentioned continuous flow water disinfection method, during the water disinfection process, the temperature of the electrodeless ultraviolet lamp is maintained below 45°C by adjusting the air volume of the air cooling device to avoid the problem of light power reduction due to excessive temperature of the electrodeless ultraviolet lamp.

[0030] The main technical concept of the present invention is:

[0031] The present invention realizes the coupling of the electroporation effect and the ultraviolet disinfection effect by changing the structure of the microwave resonant cavity of the traditional microwave electrodeless ultraviolet lamp into a single-ridge resonant cavity, changing the setting position of the electrodeless ultraviolet lamp tube, and setting a quartz water tube in the single-ridge resonant cavity. Specifically, by setting a single-ridge resonant cavity, the edge effect is used to confine the electromagnetic waves near the rectangular ridge of the single-ridge resonant cavity, effectively increasing the electric field strength in the single-ridge resonant cavity, especially generating a high-intensity electric field near the rectangular ridge of the single-ridge resonant cavity. On this basis, by setting the disinfection section of the quartz water tube above the rectangular ridge in the single-ridge resonant cavity, the electric field strength in most areas of the disinfection section of the quartz water tube exceeds 10 5V / m. At the same time, a strip-shaped gap is opened above the rectangular ridge of the single-ridge resonant cavity, and an electrodeless ultraviolet lamp is arranged at the strip-shaped gap, so that the microwave in the single-ridge resonant cavity excites the electrodeless ultraviolet lamp to generate ultraviolet rays. Through the combination of the above technical means, the disinfection section of the quartz water pipe is simultaneously in the ultraviolet irradiation and high-intensity electric field environment. When the water to be disinfected is passed into the quartz water pipe, the microorganisms in the water to be disinfected will be simultaneously subjected to the electroporation effect of the high-intensity electric field and the disinfection effect of ultraviolet radiation. After electroporation, the transmittance of the microorganism to ultraviolet rays will increase, which increases the lethality of ultraviolet rays to microorganisms and produces an electroporation-ultraviolet synergistic disinfection effect, thereby solving the problem of easy resurrection of microorganisms in the prior art using a single ultraviolet disinfection.

[0032] Compared with the prior art, the technical solution provided by the present invention produces the following beneficial technical effects:

[0033] 1. The present invention provides a microwave synchronously mediated electroporation and electrodeless ultraviolet continuous water disinfection device, which realizes the effective coupling of electroporation effect and ultraviolet disinfection effect by changing the structure of microwave resonant cavity, adjusting the setting position of electrodeless ultraviolet lamp tube, and setting quartz water tube in the high-intensity electric field area in the microwave resonant cavity. Specifically: the edge effect of the single-ridge waveguide is used to confine the electromagnetic wave near the rectangular ridge of the single-ridge resonant cavity, effectively increasing the electric field strength in the single-ridge resonant cavity; the disinfection section of the quartz water tube is arranged above the rectangular ridge in the single-ridge resonant cavity, so that the electric field strength of most areas of the disinfection section of the quartz water tube is higher than the electric field strength level that can achieve the electroporation effect; a strip gap is opened above the rectangular ridge of the single-ridge resonant cavity, and the electrodeless ultraviolet lamp tube is arranged at the strip gap, and the microwave in the single-ridge resonant cavity is used to excite the electrodeless ultraviolet lamp tube to generate ultraviolet light. Through the mutual cooperation of the above technical means, the disinfection section of the quartz water tube is simultaneously in ultraviolet irradiation and high-intensity electric field environment, thereby generating electroporation-ultraviolet synergistic disinfection. Compared with the existing ultraviolet water disinfection device, the present invention increases the transmittance of microorganisms to ultraviolet rays by utilizing electroporation efficiency, improves the sensitivity of microorganisms to ultraviolet rays, can enhance the lethality of ultraviolet rays to microorganisms, and avoids the problem of photoreactivation of microorganisms after ultraviolet disinfection. Compared with the existing high-voltage pulse electroporation sterilization device, the water disinfection device of the present invention has lower energy consumption, and the equipment is more miniaturized, which is suitable for continuous water disinfection treatment and has the advantage of lower water disinfection cost.

[0034] 2. Based on the above-mentioned microwave synchronous mediated electroporation and electrodeless ultraviolet continuous flow water disinfection device, the present invention also provides a microwave synchronous mediated electroporation and electrodeless ultraviolet continuous flow water disinfection method. This method achieves disinfection of continuous flow water bodies through the synergistic effect of electroporation effect and ultraviolet rays, which can solve the problem that microorganisms are prone to revival in ultraviolet disinfection alone, and can also solve the problem that the existing high-voltage pulse electroporation sterilization method is difficult to use for continuous water disinfection. It has broad application prospects in the field of water disinfection. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 It is a structural schematic diagram of the microwave synchronously mediated electroperforation and electrodeless ultraviolet continuous flow water disinfection device of the present invention.

[0036] Figure 2 yes Figure 1 A longitudinal section of the device.

[0037] Figure 3 yes Figure 1 A cross-sectional view of the device in the middle of the single-ridge resonant cavity.

[0038] Figure 4 This is the electric field distribution diagram in the single resonant cavity simulated in COMSOL software when the distance between the adjustable short-circuit surface and the end of the termination end of the single-ridge resonant cavity is 5 mm.

[0039] Figure 5 This is the electric field distribution diagram in the single resonant cavity simulated in COMSOL software when the distance between the adjustable short-circuit surface and the end of the termination end of the single-ridge resonant cavity is 15 mm.

[0040] Figure 6 This is the electric field distribution diagram in the single resonant cavity simulated in COMSOL software when the distance between the adjustable short-circuit surface and the end of the termination end of the single-ridge resonant cavity is 25 mm.

[0041] Figure 7 This is the electric field distribution diagram in the single resonant cavity simulated in COMSOL software when the distance between the adjustable short-circuit surface and the end of the termination end of the single-ridge resonant cavity is 35 mm.

[0042] Figure 8 This is the electric field distribution diagram in the rectangular resonant cavity simulated in COMSOL software.

[0043] Figures 1 to 3 Among them, 1: electrodeless ultraviolet lamp tube, 2: microwave source, 3: single-ridge waveguide, 4: single-ridge resonant cavity, 5: strip gap, 6: rectangular ridge, 7: lampshade, 8: quartz water pipe, 9: water inlet, 10: water outlet, 11: adjustable short-circuit road surface, 12: air cooling device, 13: support frame, 14: coaxial cable. DETAILED DESCRIPTION

[0044] The microwave synchronous dielectric perforation and electrodeless ultraviolet continuous water disinfection device and method provided by the present invention are further described by way of examples below. It is necessary to point out that the following examples are only used to further illustrate the present invention and cannot be understood as limiting the scope of protection of the present invention. The technical personnel in the relevant field make some non-essential improvements and adjustments to the present invention according to the above invention content for specific implementation, which still belongs to the scope of protection of the present invention.

[0045] In the following embodiments, the electrodeless ultraviolet lamp tube, solid-state microwave source, waveguide coaxial converter, impedance converter, coaxial cable and adjustable short-circuit path used can all be purchased from the market, and the single-ridge resonant cavity with a strip gap on the top, the lampshade and the quartz water pipe are custom-made.

[0046] Example 1

[0047] In this embodiment, the microwave synchronously mediated perforation and electrodeless ultraviolet continuous water disinfection device of the present invention is provided, and its structural schematic diagram is as follows: Figures 1 to 3 As shown, it includes an electrodeless ultraviolet lamp tube 1, a microwave source 2, an air cooling device 12, a single-ridge waveguide 3, a lampshade 7 and a quartz water tube 8.

[0048] The single-ridge waveguide 3 includes a waveguide coaxial converter, an impedance converter, a single-ridge resonant cavity 4, and an adjustable short-circuit board 11. The bottom of the single-ridge resonant cavity 4 is provided with an upwardly protruding rectangular ridge 6, and the top of the single-ridge resonant cavity 4 is provided with a strip gap 5. The strip gap 5 and the rectangular ridge 6 are both arranged along the length direction of the single-ridge resonant cavity 4. The strip gap 5 is located directly above the rectangular ridge 6. The length of the strip gap 5 is equal to the length of the single-ridge resonant cavity 4. The ratio of the width of the rectangular ridge 6 to the width of the single-ridge resonant cavity 4 is 0.3:1, and the ratio of the height of the rectangular ridge 6 to the height of the single-ridge resonant cavity 4 is 0.2:1. The adjustable short-circuit board 11 is arranged at the terminal end of the single-ridge resonant cavity 4.

[0049] The ratio of the width of the strip gap 5 to the diameter of the electrodeless ultraviolet lamp tube 1 is 1.2: 1. The electrodeless ultraviolet lamp tube 1 is arranged along the strip gap 5 and is located outside the single-ridge resonant cavity 4. The electrodeless ultraviolet lamp tube 1 is partially embedded in the strip gap 5 through the support of the support frame 13. The length of the electrodeless ultraviolet lamp tube 1 is consistent with the length of the strip gap 5. More specifically, the diameter of the electrodeless ultraviolet lamp tube 1 is 15 mm and the length of the electrodeless ultraviolet lamp tube 1 is 15 cm. The quartz water pipe 8 is arranged to penetrate the single-ridge resonant cavity 4, and the water inlet 9 and the water outlet 10 of the quartz water pipe 8 are located outside the single-ridge resonant cavity 4. The part of the quartz water pipe 8 in the single-ridge resonant cavity 4 is recorded as the disinfection section. The disinfection section of the quartz water pipe 8 is located directly above the rectangular ridge 6 and directly below the electrodeless ultraviolet lamp 1. The disinfection section of the quartz water pipe 8 is located within the irradiation range of the electrodeless ultraviolet lamp 1. The disinfection section of the quartz water pipe 8 is a straight pipe, and the inner diameter of the disinfection section of the quartz water pipe 8 is equal to the width of the rectangular ridge 6. The inner diameter of the entire quartz water pipe 8 is 2 cm. The water inlet 9 of the quartz water pipe 8 is connected to the water inlet pump through a control valve, and the water to be disinfected is input into the quartz water pipe 8 through the water inlet pump.

[0050] The lampshade 7 is detachably covered outside the electrodeless ultraviolet lamp tube 1, so that the electrodeless ultraviolet lamp tube 1 is in the space formed by the lampshade 7 and the single-ridge resonant cavity 4. One end of the lampshade 7 is connected to the air cooling device 12, and the other end of the lampshade 7 is provided with an air outlet. The material of the lampshade 7 is aluminum alloy, and the inner wall of the lampshade 7 is provided with a titanium powder coating whose main component is TiO2, which is used to reflect the ultraviolet rays emitted by the electrodeless ultraviolet lamp tube 1 back into the single-ridge resonant cavity 4. The titanium powder coating whose main component is TiO2 can reflect more than 95% of the ultraviolet rays, which increases the utilization rate of the ultraviolet rays on the one hand, and improves the corrosion resistance and stability of the inner wall of the lampshade 7 on the other hand, so as to protect the lampshade 7. The air cooling device 12 is a blower, which blows air into the lampshade 7 to cool the electrodeless ultraviolet lamp tube 1, so as to avoid the problem of optical power reduction due to excessive temperature of the electrodeless ultraviolet lamp tube 1.

[0051] The microwave source 2 is a solid-state microwave source, and the power of the microwave source is adjustable within the range of 0 to 1000 W. The microwave source 2 feeds microwaves from the starting end of the single-ridge resonant cavity 4 into the single-ridge resonant cavity 4 through a coaxial cable 14, a waveguide coaxial converter and an impedance converter. When the adjustable short-circuit surface 11 is controlled to move along the length direction of the single-ridge resonant cavity 4, the phase of the microwave in the single-ridge resonant cavity 4 can be adjusted, and then the electric field distribution in the single-ridge resonant cavity 4 can be adjusted, so that when the microwave source 2 is turned on, the electric field intensity in most of the space of the disinfection section of the quartz water pipe 8 exceeds 10 5 For example, by adjusting the position of the adjustable short-circuit 11, when the microwave source 2 is turned on, the electric field intensity of at least 50% of the space in the disinfection section of the quartz water pipe 8 can exceed 10 5 V / m.

[0052] Example 2

[0053] In this embodiment, the electric field distribution in the single-ridge resonant cavity of the water disinfection device of Embodiment 1 is simulated on the multi-physics field simulation software COMSOL to examine whether the electric field distribution in the single-ridge resonant cavity can be changed by adjusting the adjustable short-circuit path.

[0054] According to the structure of the water disinfection device described in Example 1, a model of the water disinfection device was established in the COMSOL device, and the power of the microwave source was set to 50 W and the microwave frequency was set to 2.54 GHz. The electric field distribution in the single-ridge resonant cavity was simulated in the COMSOL software. During the simulation, the electric field distribution in the single-ridge resonant cavity 4 was adjusted by controlling the adjustable short-circuit surface to move along the length direction of the single-ridge resonant cavity. When the distance between the adjustable short-circuit surface and the end of the terminal end of the single-ridge resonant cavity was 5 mm, 15 mm, 25 mm, and 35 mm, the electric field distribution in the single-ridge resonant cavity was as follows: Figures 4 to 7 As shown in the figure.

[0055] Depend on Figures 4 to 7 It can be seen that when the distance between the adjustable short-circuit surface and the end of the terminal end of the single-ridge resonant cavity is 5 mm, 15 mm, 25 mm, and 35 mm, the maximum electric field strength in the single-ridge resonant cavity is 1.44×10 5 V / m, 1.64×10 5 V / m, 1.59×10 5 V / m and 1.69×10 5 V / m, and the electric field strength in most areas of the single-ridge resonant cavity (at least 50% of the space in the sterilized section of the quartz water tube) is higher than 10 5 V / m, which means that by controlling the adjustable short-circuit path to move along the length direction of the single-ridge resonant cavity, the electric field distribution in the single-ridge resonant cavity can be adjusted, so that the electric field strength in more areas of the single-ridge resonant cavity can be higher than 10 5 V / m.

[0056] Comparative Example 1

[0057] In this comparative example, according to the length, width and height of the single-ridge resonant cavity in Example 1, a rectangular resonant cavity was established in the COMSOL software, and the power of the microwave source was set to 500 W and the microwave frequency was set to 2.54 GHz. The electric field distribution in the single-ridge resonant cavity was simulated in the COMSOL software. The results are as follows: Figure 8 As shown. Figure 8 It can be seen that even if the power of the microwave source is set to 10 times that of Example 2, the maximum electric field intensity in the rectangular resonant cavity of this comparative example is only 5375 V / m.

[0058] Combining Example 2 and Comparative Example 1, it can be seen that, relative to the rectangular resonant cavity of Comparative Example 1, the single-ridge resonant cavity of Example 1 can generate an electric field with higher intensity. Under the condition of significantly lower microwave power, the intensity of the electric field generated in the single-ridge resonant cavity is much greater than that of the rectangular resonant cavity. This shows that the water disinfection device provided by the present invention can generate significantly higher electric field intensity at relatively lower microwave power, which is conducive to reducing the input power of the microwave source and reducing the energy consumption of water disinfection. The level of electric field intensity in most areas of the single-ridge resonant cavity of Example 1 has reached a level that can achieve the electroporation effect. Under this electric field intensity condition, electroporation of microorganisms can be directly caused. At the same time, the ultraviolet rays generated by the microwave-excited electrodeless ultraviolet lamp in the single-ridge resonant cavity can achieve ultraviolet disinfection, thereby achieving electroporation and ultraviolet coordinated disinfection, and strengthening the disinfection effect on the water body.

[0059] Comparative Example 2

[0060] The structure of the water disinfection device provided in this comparative example is basically the same as that of the water disinfection device in Example 1, with the only difference being that the single ridge resonant cavity in Example 1 is replaced by a rectangular resonant cavity with the same length, width and height, that is, a strip gap is provided on the top of the rectangular resonant cavity, and the strip gap is arranged along the length direction of the rectangular resonant cavity, and the setting position of the strip gap is the same as the setting position of the strip gap on the ridge resonant cavity in the water disinfection device described in Example 1.

[0061] Example 3

[0062] In this embodiment, taking the water disinfection device described in Example 1 as an example, the microwave synchronous mediated perforation and electrodeless ultraviolet continuous flow water disinfection method of the present invention is described in detail, and the steps are as follows:

[0063] (1) Prepare E. coli with deionized water to a concentration of about 1.0 × 10 8 CFU / mL of bacterial solution is used as the water to be disinfected.

[0064] (2) Turn on the microwave source and air cooling device of the microwave synchronous dielectric perforation and electrodeless ultraviolet continuous flow water disinfection device, control the microwave source power to 100 W and the microwave frequency to 2.45 GHz, and adjust the position of the adjustable short-circuit surface so that the electric field intensity of at least 50% of the space in the disinfection section of the quartz water pipe exceeds 10 5V / m (refer to the results of simulating the electric field distribution in COMSOL software in Example 2 to adjust the adjustable circuit), the microwave in the single-ridge resonant cavity excites the electrodeless ultraviolet lamp to produce ultraviolet rays. The water to be disinfected is continuously introduced into the quartz water pipe through the water inlet pump and continuously discharged from the water outlet. The flow rate of the water in the quartz water pipe is controlled to be 100 mL / min. When the water flows through the disinfection section of the quartz water pipe, the intensity in the area where the quartz water pipe is set in the single-ridge resonant cavity is higher than 10 5 The electric field of 100 V / m and ultraviolet light produce electroporation-ultraviolet light synergistic disinfection effect on the water body. During the water disinfection process, the temperature of the electrodeless ultraviolet lamp is kept below 45 ℃ by controlling the air volume of the air cooling device.

[0065] When the flow rate of the water in the quartz water tube reaches a stable state, samples are taken from the water outlet of the quartz water tube to determine the concentration of Escherichia coli, and the sterilization efficiency is calculated, and the result is 99.999% (5 logarithmic inactivation rate).

[0066] Example 4

[0067] In this embodiment, taking the water disinfection device described in Example 1 as an example, the microwave synchronous mediated perforation and electrodeless ultraviolet continuous flow water disinfection method of the present invention is described in detail, and the steps are as follows:

[0068] (1) The secondary effluent of a sewage treatment plant is used as the water body to be disinfected. The fecal coliform group concentration in the secondary effluent of the sewage treatment plant is 3.0×10 4 CFU / mL.

[0069] (2) Turn on the microwave source and air cooling device of the microwave synchronous dielectric perforation and electrodeless ultraviolet continuous flow water disinfection device, control the microwave source power to 200 W and the microwave frequency to 2.45 GHz, and adjust the position of the adjustable short-circuit surface so that the electric field intensity of at least 50% of the space in the disinfection section of the quartz water pipe exceeds 10 5 V / m (refer to the results of simulating the electric field distribution in COMSOL software in Example 2 to adjust the adjustable circuit), the microwave in the single-ridge resonant cavity excites the electrodeless ultraviolet lamp to produce ultraviolet rays. The water to be disinfected is continuously introduced into the quartz water pipe through the water inlet pump from the water inlet and continuously discharged from the water outlet. The flow rate of the water in the quartz water pipe is controlled to be 150 mL / min. When the water flows through the disinfection section of the quartz water pipe, the intensity in the area where the quartz water pipe is set in the single-ridge resonant cavity is higher than 10 5 The electric field of 100 V / m and the ultraviolet light produce an electroporation-ultraviolet light synergistic disinfection effect on the water body. During the water disinfection process, the temperature of the electrodeless ultraviolet lamp is kept below 45°C by controlling the air volume of the air cooling device.

[0070] When the flow rate of the water in the quartz water pipe reached stability, samples were taken from the outlet of the quartz water pipe to measure the concentration of fecal coliform group, and it was found that no fecal coliform group was detected in the outlet water.

[0071] Comparative Example 3

[0072] In this comparative example, the water disinfection device described in comparative example 2 was used to carry out water disinfection treatment, and the steps were as follows:

[0073] (1) The secondary effluent of a sewage treatment plant is used as the water body to be disinfected. The fecal coliform group concentration in the secondary effluent of the sewage treatment plant is 3.0×10 4 CFU / mL (the same as the water to be disinfected used in Example 4).

[0074] (2) Turn on the microwave source and air cooling device of the water disinfection device described in Comparative Example 1, control the power of the microwave source to 500 W and the microwave frequency to 2.45 GHz; continuously pass the water to be disinfected into the quartz water pipe through the water inlet through the water inlet pump and continuously discharge it from the water outlet, and control the flow rate of the water in the quartz water pipe to be 150 mL / min. During the water disinfection process, the temperature of the electrodeless ultraviolet lamp is kept below 45°C by controlling the air volume of the air cooling device.

[0075] When the flow rate of the water in the quartz water pipe reached a stable state, samples were taken from the outlet of the quartz water pipe to measure the fecal coliform group concentration. The results showed that the fecal coliform group concentration in the outlet water did not change and was still 3.0×10 4 CFU / mL.

[0076] Comparative Example 4

[0077] In this comparative example, the water disinfection device described in comparative example 2 was used for water disinfection. Considering that no bactericidal effect was produced on fecal coliform bacteria in the water body under the experimental conditions of comparative example 3, this comparative example investigated the water disinfection effect under the condition of reducing the water inlet flow rate, and the steps were as follows:

[0078] (1) The secondary effluent of a sewage treatment plant is used as the water body to be disinfected. The fecal coliform group concentration in the secondary effluent of the sewage treatment plant is 3.0×10 4 CFU / mL (the same as the water to be disinfected used in Example 4).

[0079] (2) Turn on the microwave source and air cooling device of the water disinfection device described in Comparative Example 1, control the power of the microwave source to 500 W and the microwave frequency to 2.45 GHz; continuously pass the water to be disinfected into the quartz water pipe through the water inlet through the water inlet pump and continuously discharge it from the water outlet, and control the flow rate of the water in the quartz water pipe to be 100 mL / min. During the water disinfection process, the temperature of the electrodeless ultraviolet lamp is kept below 45°C by controlling the air volume of the air cooling device.

[0080] When the flow rate of the water in the quartz water pipe reached a stable state, samples were taken from the outlet of the quartz water pipe to measure the fecal coliform group concentration. The results showed that the fecal coliform group concentration in the outlet water did not change and was still 3.0×10 4 CFU / mL.

[0081] Comparative Examples 3 and 4 failed to produce an effective bactericidal effect on fecal Escherichia coli in the water body. The reason should be that the electric field intensity generated in the rectangular resonant cavity of the water disinfection device is too small to reach the level that can produce the electroporation effect, and only a single ultraviolet disinfection effect is produced. However, the single ultraviolet disinfection has the problem of limited disinfection effect and easy photoreactivation. Comparative Example 4 still failed to play an effective bactericidal effect after reducing the water inlet flow rate on the basis of Comparative Example 3. Combining Example 4 and Comparative Examples 3~4, it can be seen that compared with Comparative Examples 3~4, the method of the present invention produces a significantly better water disinfection effect due to the electroporation-ultraviolet synergistic disinfection effect.

[0082] Example 5

[0083] In this embodiment, the microwave synchronously mediated perforation and electrodeless ultraviolet continuous flow water disinfection device and method described in the present invention are provided.

[0084] The water disinfection device in this embodiment is basically the same as that in Embodiment 1, except that the ratio of the width of the rectangular ridge to the width of the single ridge resonant cavity is 0.5:1, and the ratio of the height of the rectangular ridge 6 to the height of the single ridge resonant cavity 4 is 0.4:1. The ratio of the width of the strip gap to the diameter of the electrodeless ultraviolet lamp is 0.4:1. The inner diameter of the quartz water pipe is 2 cm, and the inner diameter of the disinfection section of the quartz water pipe accounts for 80% of the width of the rectangular ridge. The operation of continuous flow water disinfection using the water disinfection device is as follows:

[0085] (1) Prepare E. coli with deionized water to a concentration of about 1.0 × 10 7 CFU / mL of bacterial solution is used as the water to be disinfected.

[0086] (2) Turn on the microwave source and air cooling device of the microwave synchronous dielectric perforation and electrodeless ultraviolet continuous flow water disinfection device, control the microwave source power to 300 W and the microwave frequency to 2.45 GHz, and adjust the position of the adjustable short-circuit surface so that the electric field intensity of at least 50% of the space in the disinfection section of the quartz water pipe exceeds 10 5V / m (the electric field distribution is simulated in COMSOL software, and the adjustable circuit is adjusted according to the simulation results). The microwave in the single-ridge resonant cavity excites the electrodeless ultraviolet lamp to produce ultraviolet rays. The water to be disinfected is continuously introduced into the quartz water pipe through the water inlet pump from the water inlet and continuously discharged from the water outlet. The flow rate of the water in the quartz water pipe is controlled to be 100 mL / min. When the water flows through the disinfection section of the quartz water pipe, the intensity in the area where the quartz water pipe is set in the single-ridge resonant cavity is higher than 10 5 The electric field of 100 V / m and the ultraviolet light produce an electroporation-ultraviolet light synergistic disinfection effect on the water body. During the water disinfection process, the temperature of the electrodeless ultraviolet lamp is kept below 45°C by controlling the air volume of the air cooling device.

[0087] When the flow rate of the water in the quartz water pipe reaches a stable state, samples are taken from the water outlet of the quartz water pipe to determine the concentration of E. coli. As a result, it is found that no E. coli is detected in the outlet water.

[0088] Example 6

[0089] In this embodiment, the microwave synchronously mediated perforation and electrodeless ultraviolet continuous flow water disinfection device and method described in the present invention are provided.

[0090] The water disinfection device in this embodiment is basically the same as that in Embodiment 1, except that the disinfection section of the quartz water pipe is a serpentine pipe, the inner diameter of the serpentine pipe is 5 mm, and the spiral diameter of the serpentine pipe (the dimension of the widest part of the spiral of the serpentine pipe) is equal to the width of the rectangular ridge of the single-ridge resonant cavity. The operation of continuous flow water disinfection using the water disinfection device is as follows:

[0091] (1) Prepare E. coli with deionized water to a concentration of about 1.0 × 10 8 CFU / mL of bacterial solution is used as the water to be disinfected.

[0092] (2) Turn on the microwave source and air cooling device of the microwave synchronous dielectric perforation and electrodeless ultraviolet continuous flow water disinfection device, control the microwave source power to 500 W and the microwave frequency to 2.45 GHz, and adjust the position of the adjustable short-circuit surface so that the electric field intensity of at least 50% of the space in the disinfection section of the quartz water pipe exceeds 10 5 V / m (the electric field distribution is simulated in COMSOL software, and the adjustable circuit is adjusted according to the simulation results). At the same time, the microwave in the single-ridge resonant cavity excites the electrodeless ultraviolet lamp to produce ultraviolet rays. The water to be disinfected is continuously introduced into the quartz water pipe through the water inlet pump and continuously discharged from the water outlet. The flow rate of the water in the quartz water pipe is controlled to be 200 mL / min. When the water flows through the disinfection section of the quartz water pipe, the intensity in the area where the quartz water pipe is set in the single-ridge resonant cavity is higher than 10 5The electric field of 100 V / m and the ultraviolet light produce an electroporation-ultraviolet light synergistic disinfection effect on the water body. During the water disinfection process, the temperature of the electrodeless ultraviolet lamp is kept below 45°C by controlling the air volume of the air cooling device.

[0093] When the flow rate of the water in the quartz water tube reaches a stable state, samples are taken from the water outlet of the quartz water tube to determine the concentration of Escherichia coli, and the sterilization efficiency is calculated, and the result is 99.999% (5 logarithmic inactivation rate).

Claims

1. A microwave synchronously mediated perforation and electrodeless ultraviolet continuous water disinfection device, comprising an electrodeless ultraviolet lamp (1), a microwave source (2), and an air cooling device (12), characterized in that: It also includes a single-ridge waveguide (3), a lampshade (7) and a quartz water tube (8); The single-ridge waveguide (3) comprises a waveguide coaxial converter, an impedance converter, a single-ridge resonant cavity (4), and an adjustable short-circuit surface (11); the bottom of the single-ridge resonant cavity (4) is provided with an upwardly protruding rectangular ridge (6); the top of the single-ridge resonant cavity (4) is provided with a strip-shaped gap (5); the strip-shaped gap (5) and the rectangular ridge (6) are both arranged along the length direction of the single-ridge resonant cavity (4); and the adjustable short-circuit surface (11) is arranged at the terminal end of the single-ridge resonant cavity (4); The electrodeless ultraviolet lamp tube (1) is arranged along the strip-shaped gap (5); the quartz water pipe (8) is arranged to penetrate the single-ridge resonant cavity (4); the water inlet (9) and the water outlet (10) of the quartz water pipe (8) are located outside the single-ridge resonant cavity (4); the portion of the quartz water pipe (8) in the single-ridge resonant cavity (4) is recorded as a disinfection section; the disinfection section is located above the rectangular ridge (6) and within the irradiation range of the electrodeless ultraviolet lamp tube (1); the lampshade (7) is arranged outside the electrodeless ultraviolet lamp tube (1) so that the electrodeless ultraviolet lamp tube (1) is located in the space formed by the lampshade (7) and the single-ridge resonant cavity (4); one end of the lampshade (7) is connected to the air cooling device (12); the other end of the lampshade (7) is provided with an air outlet; The microwave source (2) feeds microwaves into the single-ridge resonant cavity (4) via a coaxial cable (14) via a waveguide coaxial converter and an impedance converter.

2. According to the microwave synchronously mediated perforation and electrodeless ultraviolet continuous water disinfection device of claim 1, it is characterized in that: The sterilizing section of the quartz water tube (8) is located directly above the rectangular ridge (6).

3. According to claim 2, the microwave synchronously mediated perforation and electrodeless ultraviolet continuous water disinfection device is characterized in that: When the microwave source (2) is turned on, by adjusting the adjustable short-circuit surface (11), the electric field intensity of at least 50% of the space in the disinfection section of the quartz water pipe (8) can exceed 10 5 V / m.

4. The microwave synchronously mediated perforation and electrodeless ultraviolet continuous water disinfection device according to claim 1 is characterized in that: The ratio of the width of the strip-shaped gap (5) to the diameter of the electrodeless ultraviolet lamp tube (1) is (0.4-1.2):1, and the electrodeless ultraviolet lamp tube (1) is located outside the single-ridge resonant cavity (4) and is partially embedded in the strip-shaped gap (5).

5. The microwave synchronously mediated perforation and electrodeless ultraviolet continuous water disinfection device according to claim 1 is characterized in that: The ratio of the width of the rectangular ridge (6) to the width of the single-ridge resonant cavity (4) is (0.3-0.5):1, and the ratio of the height of the rectangular ridge (6) to the height of the single-ridge resonant cavity (4) is (0.2-0.4):

1.

6. The microwave synchronously mediated perforation and electrodeless ultraviolet continuous water disinfection device according to any one of claims 1 to 5, characterized in that: The disinfection section of the quartz water pipe (8) is a straight pipe or a serpentine pipe.

7. The microwave synchronously mediated perforation and electrodeless ultraviolet continuous water disinfection device according to any one of claims 1 to 5, characterized in that: The inner wall of the lampshade (7) is provided with a coating of ultraviolet reflective material.

8. A microwave synchronously mediated electroporation and electrodeless ultraviolet continuous water disinfection method, characterized in that: The method uses the microwave synchronously mediated perforation and electrodeless ultraviolet continuous water disinfection device as described in any one of claims 1 to 7, and the steps are as follows: The microwave source (2) and the air cooling device (12) of the microwave synchronously mediated perforation and electrodeless ultraviolet continuous water disinfection device are turned on, and the electric field distribution in the single-ridge resonant cavity (4) is adjusted by the adjustable short-circuit surface (11) so that the electric field intensity of at least 50% of the space in the disinfection section of the quartz water pipe (8) exceeds 10 5 V / m, the microwaves in the single-ridge resonant cavity (4) excite the electrodeless ultraviolet lamp (1) to generate ultraviolet rays; the water to be disinfected is continuously introduced into the quartz water pipe (8) from the water inlet (9) and continuously discharged from the water outlet (10); when the water flows through the disinfection section of the quartz water pipe (8), the intensity in the area where the quartz water pipe (8) is set in the single-ridge resonant cavity (4) is higher than 10 5 The electric field of V / m and ultraviolet light produce electroporation-ultraviolet light synergistic disinfection effect on water bodies.

9. The microwave synchronously mediated perforation and electrodeless ultraviolet continuous water disinfection method according to claim 8, characterized in that: The flow rate of water in the quartz water tube (8) is controlled not to exceed 200 mL / min.

10. The microwave synchronously mediated perforation and electrodeless ultraviolet continuous water disinfection method according to claim 8 or 9, characterized in that: The temperature of the electrodeless ultraviolet lamp tube (1) is kept below 45° C. during the water disinfection process by adjusting the air volume of the air cooling device (12).

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