Ultraviolet-ozone water disinfection device and method for cooling lamp tube and synchronously generating ozone

Abstract

The invention belongs to the technical field of water treatment and wastewater treatment, and provides an ultraviolet-ozone water disinfection device and method for cooling a lamp tube and synchronously generating ozone. The water disinfection device comprises an electrodeless ultraviolet disinfection unit, a synchronous cooling ozone generation unit, an ozone disinfection unit and a control unit, the electrodeless ultraviolet disinfection unit comprises a microwave generator, a waveguide, a microwave resonant cavity and a 185 / 254 nm dual-wavelength electrodeless ultraviolet lamp tube, and the synchronous cooling ozone generation unit comprises an air blower, an air inlet pipe, an air outlet pipe, a quartz sleeve and oxygen supply equipment. The ozone disinfection unit comprises a microporous aeration disc, and the control unit comprises a control box, a temperature sensor, an electromagnetic valve and an ozone concentration monitor. According to the invention, the dual-wavelength ultraviolet lamp tube is cooled by using large-flow air or air / oxygen mixed gas, and ozone is synchronously and efficiently generated, so that an ultraviolet-ozone combined water disinfection process is constructed, the promotion effect of ozone on water disinfection is fully utilized, the water disinfection effect is enhanced, and the applicability of the method to water bodies with different water qualities is improved.

Description

Technical Field

[0001] The invention belongs to the technical field of water treatment and wastewater treatment, and relates to an ultraviolet-ozone water disinfection device and method for cooling a lamp tube and synchronously generating ozone. Background Art

[0002] Disinfection is an important part of water treatment. For example, wastewater treatment and drinking water treatment all require disinfection. Ultraviolet disinfection technology is currently a widely used water disinfection process. Microwave electrodeless ultraviolet lamp is a kind of ultraviolet lamp that is excited by high-energy microwaves and radiates ultraviolet rays. Compared with the traditional electrodeless ultraviolet lamp that relies on electrode excitation, microwave electrodeless ultraviolet lamp does not require electrodes, does not have the problem of electrode aging, and has the characteristics of longer service life and better disinfection effect. However, whether it is an electrodeless ultraviolet lamp or an electrodeless ultraviolet lamp for water disinfection, the lamp tube will generate a lot of heat during operation, causing the lamp tube temperature to rise sharply. Excessive temperature of the lamp tube will shorten the service life of the lamp tube, reduce the light power and reduce the disinfection effect. Therefore, efficient cooling of ultraviolet lamps is an important prerequisite for extending the service life of ultraviolet lamps and ensuring the disinfection effect. At the same time, the pollutants in water are complex. In addition to pathogenic microorganisms, it also contains a large amount of organic and inorganic substances that can absorb ultraviolet rays. The presence of these substances will also reduce the penetration ability of ultraviolet rays in water and reduce the disinfection effect.

[0003] The dual-wavelength electrodeless UV lamp can simultaneously radiate ultraviolet rays with wavelengths of 254 nm and 185 nm under microwave excitation. Among them, the ultraviolet rays with a wavelength of 254 nm have a good bactericidal effect, and the ultraviolet rays with a wavelength of 185 nm can convert oxygen into ozone. Ozone disinfection is an efficient chemical disinfection method. The diffusivity of ozone can make up for the shortcomings of ultraviolet rays propagating in a straight line and the existence of dead corners in disinfection, thereby enhancing the disinfection effect. Ozone can also reduce the turbidity of water and increase the penetration rate of ultraviolet rays in water. Ozone can also produce hydroxyl free radicals in water, thereby destroying the cell structure of bacteria and effectively inhibiting the resurrection of bacteria after ultraviolet disinfection.

[0004] In the prior art, when using ultraviolet lamps for water disinfection, the ultraviolet lamp tube is directly immersed in water, and the ultraviolet lamp tube is cooled by the water body being disinfected while the water is disinfected. However, the use of extreme ultraviolet lamps for water disinfection has the problem of easy aging of electrodes, and relying on a single ultraviolet disinfection also has the disadvantage of easy resurrection of bacteria. Although the ultraviolet light with a wavelength of 185 nm emitted by the dual-wavelength electrodeless ultraviolet lamp can convert oxygen into ozone, the amount of ozone that can be produced by irradiating the water body is very limited due to the very low dissolved oxygen content in the water; at the same time, the ultraviolet light with a wavelength of 185 nm will be greatly attenuated after being irradiated into the water, which will also reduce its ability to convert oxygen into ozone. Therefore, the ozone yield of the existing method of using dual-wavelength electrodeless ultraviolet lamps for water disinfection is very low. Low ozone yield means that it is impossible to produce an effective ozone disinfection effect, it is impossible to use ozone to effectively reduce the turbidity of the water body, and it is even more impossible to adjust the ozone yield according to the differences in water quality conditions, thereby ensuring the disinfection effect of water bodies with different water qualities. Therefore, compared with the method of using an extreme ultraviolet lamp for water disinfection, the current method of using a dual-wavelength electrodeless ultraviolet lamp for water disinfection has a very limited improvement in the water disinfection effect. Therefore, it is necessary to improve the existing method and device for water disinfection using a dual-wavelength ultraviolet lamp, increase the ozone yield in the water disinfection process and achieve controllable regulation of the ozone yield, thereby effectively coupling the ozone disinfection effect with the ultraviolet disinfection effect, strengthening the water disinfection effect and expanding the applicability of the water disinfection method to water bodies of different water qualities. Summary of the invention

[0005] In view of the problems of easy aging of electrodes and easy revival of bacteria in the existing water disinfection using extreme ultraviolet lamps, and the problem of very low ozone yield in the existing water disinfection using dual-wavelength extreme ultraviolet lamps, which cannot effectively improve the water disinfection effect, cannot flexibly adjust the ozone yield according to water quality conditions, and has large differences in disinfection effects on water bodies with different water qualities, the present invention provides an ultraviolet-ozone water disinfection device and method for cooling lamp tubes and synchronously producing ozone, which utilizes a large flow of air or air / oxygen mixed gas to cool the dual-wavelength ultraviolet lamp tubes and synchronously and efficiently produce ozone, constructing an ultraviolet-ozone combined water disinfection process, so as to fully utilize the promoting effect of ozone on water disinfection, effectively improve the water disinfection effect, and increase the applicability of the disinfection method to water bodies with different water qualities.

[0006] In order to achieve the above-mentioned invention object, the technical solution adopted by the present invention is as follows:

[0007] An ultraviolet-ozone water disinfection device for cooling lamp tubes and synchronously producing ozone, comprising an electrodeless ultraviolet disinfection unit, a synchronous cooling ozone production unit, an ozone disinfection unit and a control unit;

[0008] The number of the electrodeless ultraviolet disinfection units is multiple groups, and each group of electrodeless ultraviolet disinfection units includes a microwave generator, a waveguide, a microwave resonant cavity and a 185 / 254 nm dual-wavelength electrodeless ultraviolet lamp tube, the microwave resonant cavity is a metal mesh microwave resonant cavity, and the microwave generator is provided with a heat dissipation fan; the synchronous cooling ozone production unit includes a blower, an air inlet pipe, an air outlet pipe, a quartz sleeve and an oxygen supply device, and the blower includes a power regulating device; the ozone disinfection unit includes an ozone delivery pipe, a one-way valve and a microporous aeration disk; the control unit includes a control box, a temperature sensor, a solenoid valve and an ozone concentration monitor;

[0009] The microwave generator is connected to the microwave resonant cavity via a waveguide, each microwave resonant cavity is provided with a 185 / 254 nm dual-wavelength electrodeless ultraviolet lamp, and each microwave resonant cavity is respectively sleeved with a quartz sleeve; one end of the air inlet pipe and the air outlet pipe is open and the other end is closed, and the air inlet pipe and the air outlet pipe are provided with connecting holes of a number and size matching the quartz sleeve, and the two ends of each quartz sleeve are respectively connected to the connecting holes on the air inlet pipe and the air outlet pipe, and the microwave resonant cavity is located in the connecting space formed by the quartz sleeve and the air inlet pipe and the air outlet pipe, and the open end of the air inlet pipe is connected to the blower and the oxygen supply equipment through the air inlet delivery pipe, and the open end of the air outlet pipe is connected to the microporous aeration disk through the ozone delivery pipe via a one-way valve; the temperature sensor is located between the microwave resonant cavity and the quartz sleeve, the probe of the ozone concentration monitor is located on the outside of the ozone delivery pipe between the one-way valve and the microporous aeration disk, and the solenoid valve is located at the oxygen outlet of the oxygen supply equipment;

[0010] The microwave generator, the power regulating device of the blower, the electromagnetic valve, the temperature sensor, and the ozone concentration monitor are all connected to the control box.

[0011] In the technical solution of the water disinfection device, the 185 / 254 nm dual-wavelength electrodeless ultraviolet lamp tubes are arranged along the length direction of the microwave resonant cavity, and each microwave resonant cavity is provided with a plurality of 185 / 254 nm dual-wavelength electrodeless ultraviolet lamp tubes.

[0012] Furthermore, in the technical solution of the above-mentioned water disinfection device, each 185 / 254 nm dual-wavelength electrodeless ultraviolet lamp tube is arranged in a centrally symmetrical manner in the microwave resonant cavity, and each microwave resonant cavity is provided with 6 to 9 185 / 254 nm dual-wavelength electrodeless ultraviolet lamp tubes.

[0013] In the technical solution of the above-mentioned water disinfection device, the air inlet pipe and the air outlet pipe are parallel to each other, the air inlet pipe is located above the air outlet pipe, and the quartz sleeves are parallel to each other. For example, the air inlet pipe can be arranged parallel to the horizontal plane, and the quartz sleeve can be arranged perpendicular to the horizontal plane. Since ultraviolet rays will attenuate in the water body, in order to ensure that the water body in the ultraviolet water disinfection area receives ultraviolet rays of sufficient intensity, the distance between adjacent quartz sleeves is preferably 15 to 25 cm. Furthermore, the quartz sleeve array arrangement can be, for example, a linear array or a planar array.

[0014] In the technical solution of the above-mentioned water disinfection device, the air inlet pipe is provided with mounting holes whose number matches that of the quartz sleeve, and the output end of the waveguide extends into the air inlet pipe through the mounting hole and is connected to the input end of the microwave resonant cavity, or the input end of the microwave resonant cavity extends out of the air inlet pipe through the mounting hole and is connected to the output end of the waveguide.

[0015] In the technical solution of the above water disinfection device, the control box adjusts the air input of the blower according to the temperature signal fed back by the temperature sensor, and the control box adjusts the opening degree of the solenoid valve and thus adjusts the oxygen input according to the ozone concentration signal fed back by the ozone concentration monitor.

[0016] Furthermore, in the technical solution of the above-mentioned water disinfection device, the temperature sensor transmits the detected temperature signal to the control box. When the temperature is higher than the set temperature threshold, the control box adjusts the air input of the blower by adjusting the power adjustment device of the blower so that the temperature inside the quartz sleeve does not exceed the set temperature threshold.

[0017] Furthermore, in the technical solution of the above-mentioned water disinfection device, the ozone concentration monitor transmits the detected ozone concentration signal to the control box. When the ozone concentration is outside the set ozone concentration range, the control box adjusts the oxygen input by adjusting the opening degree of the solenoid valve to make the ozone concentration in the wastewater within the set ozone concentration range.

[0018] In the technical solution of the above-mentioned water disinfection device, the number of the electrodeless ultraviolet disinfection units is determined according to the actual application requirements. For example, it can be determined in combination with the spatial dimensions of the place where the water disinfection device is arranged in actual application. It is usually based on the principle that the irradiation range of the 185 / 254 nm dual-wavelength ultraviolet lamp can completely cover a certain section of the place where the water disinfection device is arranged. For example, in actual applications, the water disinfection device is usually placed in a disinfection channel for use. The number of electrodeless ultraviolet disinfection units can be determined according to the width of the disinfection channel, so that the irradiation range of the 185 / 254 nm dual-wavelength ultraviolet lamp can completely cover the section where the width direction of the disinfection channel is located. Most basically, the number of the electrodeless ultraviolet disinfection units is at least 3 groups.

[0019] In the technical solution of the water disinfection device, the length of each quartz sleeve should satisfy the following requirement: after connecting the two ends of the quartz sleeve to the connecting holes on the air inlet pipe and the air outlet pipe, each quartz sleeve and the air inlet pipe and the air outlet pipe can form a mutually connected space to achieve smooth circulation of air or a mixed gas of air and oxygen in the connected space. The ratio of the length of the 185 / 254 nm dual-wavelength ultraviolet lamp tube to the length of the microwave resonant cavity is (0.8~1):1.

[0020] In the technical solution of the water disinfection device, the distance between the outer wall of the microwave resonant cavity and the inner wall of the quartz sleeve is preferably 4-15 mm, which can ensure the cooling effect of the 185 / 254 nm dual-wavelength ultraviolet lamp tube and ensure that the diameter of the quartz sleeve is not too large to affect the ultraviolet water disinfection effect. Generally speaking, the outer diameter of the quartz sleeve is usually not more than 150 mm.

[0021] In the technical solution of the water disinfection device described above, in order to increase the stability of the water disinfection device during use, the air inlet pipe and the air outlet pipe are preferably supported by a support member.

[0022] In the technical solution of the above water disinfection device, the material of the air inlet pipe and the air outlet pipe is a corrosion-resistant material, for example, the material of the air inlet pipe and the air outlet pipe can be stainless steel.

[0023] In the technical solution of the above-mentioned water disinfection device, an anti-ozone corrosion coating is provided on the inner walls of the air inlet pipe and the air outlet pipe, and the anti-ozone corrosion coating can be a fluorocarbon coating, a polyurethane coating, etc.

[0024] In the technical solution of the above water disinfection device, the cross-sectional shapes of the air inlet pipe and the air outlet pipe can be rectangular.

[0025] In the technical scheme of the above-mentioned water disinfection device, the ozone delivery pipe is a soft pipe resistant to ozone corrosion, for example, it can be a butyl synthetic rubber pipe, so as to facilitate the adjustment of the position of the microporous aeration plate in the water body to be disinfected in actual applications. For example, the microporous aeration plate can be placed within the ultraviolet irradiation range of the 185 / 254 nm dual-wavelength electrodeless ultraviolet lamp to form an ozone / ultraviolet synchronous water disinfection process, or the microporous aeration plate can be placed upstream of the ultraviolet irradiation range of the 185 / 254 nm dual-wavelength electrodeless ultraviolet lamp to form an ozone-ultraviolet water disinfection process, or the microporous aeration plate can be placed downstream of the ultraviolet irradiation range of the 185 / 254 nm dual-wavelength electrodeless ultraviolet lamp to form an ultraviolet-ozone water disinfection process.

[0026] In the technical solution of the water disinfection device, in order to improve the efficiency and effect of ozone treatment, the microporous aeration disk includes a plurality of microporous aeration disks, each of which can be arranged in an array. The microporous aeration disk is made of corrosion-resistant material.

[0027] In the technical solution of the above-mentioned water disinfection device, the 185 / 254 nm dual-wavelength electrodeless ultraviolet lamp refers to an ultraviolet lamp that can emit ultraviolet rays with a wavelength of 254 nm and a wavelength of 185 nm under microwave excitation.

[0028] In the technical solution of the above-mentioned water disinfection device, the waveguide is mainly used to transmit microwaves and feed the microwaves generated by the microwave generator into the microwave resonant cavity; the microwave resonant cavity is used to confine the microwaves within the microwave resonant cavity, reduce microwave leakage, and make the microwave energy evenly distributed in the microwave resonant cavity, so that the 185 / 254 nm dual-wavelength electrodeless ultraviolet lamp tube can emit light more evenly.

[0029] The present invention also provides an ultraviolet-ozone water disinfection method for cooling the lamp tube and synchronously generating ozone. The method adopts the above-mentioned water disinfection device and the steps are as follows:

[0030] The quartz sleeve, microporous aeration disk and probe of the ozone concentration monitor of the water disinfection device are immersed in the flowing water to be disinfected, so that the water to be disinfected flows between the quartz sleeves, the microwave generator is turned on to excite the 185 / 254 nm dual-wavelength electrodeless ultraviolet lamp to generate ultraviolet rays with wavelengths of 254 nm and 185 nm, the blower or the blower and the oxygen supply equipment are turned on to convey air or a mixed gas of air and oxygen into the air inlet pipe as cooling gas, while the cooling gas cools the 185 / 254 nm dual-wavelength electrodeless ultraviolet lamp, the oxygen in the cooling gas is converted into ozone under the action of ultraviolet rays with a wavelength of 185 nm; the ozone is collected in the air outlet pipe and then conveyed to the microporous aeration disk through the ozone conveying pipe to enter the water body, the water body is disinfected and pollutants in the water body are degraded, and at the same time, the ultraviolet rays with a wavelength of 254 nm disinfect the water body;

[0031] During the disinfection process of the water body, the temperature sensor transmits the detected temperature signal to the control box. When the temperature is higher than the set temperature threshold, the control box adjusts the air input of the blower by adjusting the power adjustment device of the blower, so that the temperature in the quartz sleeve does not exceed the set temperature threshold; the ozone concentration monitor transmits the detected ozone concentration signal in the water body to the control box. When the ozone concentration in the water body is outside the set ozone concentration range, the control box adjusts the oxygen input by adjusting the opening degree of the solenoid valve, so that the ozone concentration in the water body is within the set ozone concentration range.

[0032] In the technical solution of the above-mentioned water disinfection method, the set temperature threshold is preferably 45°C, that is, the temperature inside the quartz sleeve is controlled not to exceed 45°C; the set ozone concentration range is preferably 0.5~1.5 mg / L, that is, during the water disinfection process, the ozone concentration in the water body in the area where the microporous aeration disk is located is controlled to be 0.5~1.5 mg / L.

[0033] In the technical scheme of the above-mentioned water disinfection method, the microporous aeration plate can be placed within the ultraviolet irradiation range of the 185 / 254 nm dual-wavelength electrodeless ultraviolet lamp, or the microporous aeration plate can be placed upstream of the ultraviolet irradiation range of the 185 / 254 nm dual-wavelength electrodeless ultraviolet lamp, or the microporous aeration plate can be placed downstream of the ultraviolet irradiation range of the 185 / 254 nm dual-wavelength electrodeless ultraviolet lamp.

[0034] When the microporous aeration plate is placed within the ultraviolet irradiation range of the 185 / 254 nm dual-wavelength electrodeless ultraviolet lamp, an ozone / ultraviolet synchronous water disinfection process can be formed. This process is suitable for the situation where the water body contains a large number of microorganisms but the content of organic matter, inorganic matter and other substances that absorb ultraviolet rays in the water body is relatively low. The free radicals generated by ozone in the water body and ultraviolet rays are used to simultaneously disinfect the water; when the microporous aeration plate is placed upstream of the ultraviolet irradiation range of the 185 / 254 nm dual-wavelength electrodeless ultraviolet lamp, an ozone-ultraviolet water disinfection process can be formed. This process is suitable for the situation where the water body to be disinfected contains a large number of organic matter, inorganic matter and other substances that absorb ultraviolet rays. The free radicals generated in the water by ozone at the front end of ultraviolet disinfection are used to degrade organic and inorganic substances in the water, thereby improving the penetration ability of ultraviolet rays in the water body, improving the utilization rate of ultraviolet rays and the ultraviolet water disinfection effect .... When the water is downstream of the ultraviolet irradiation range of the 1000 nm dual-wavelength electrodeless ultraviolet lamp, a UV-ozone water disinfection process can be formed. This process is suitable for situations where the content of organic and inorganic substances that absorb ultraviolet light in the water body is relatively low, but the microbial resurrection is more obvious after ultraviolet disinfection. Ozone treatment is performed at the back end of ultraviolet disinfection to prevent the resurrection of microorganisms.

[0035] In the technical solution of the above-mentioned water disinfection method, the cooling lamp and the ultraviolet-ozone water disinfection that simultaneously produces ozone are used in conjunction with an ozone collection and treatment device. Specifically, an air collecting hood is set on the water surface of the aeration area of ​​the microporous aeration disk, and the lower end of the air collecting hood is located below the water surface to collect unused ozone, and the collected ozone is passed into potassium iodide absorption liquid for absorption to prevent ozone from escaping and polluting the air.

[0036] In the technical solution of the above-mentioned water disinfection method, in order to ensure the water disinfection effect, it is preferred to control the flow rate of the water to be disinfected not to exceed 0.5 m / s. For example, the flow rate of the water to be disinfected can usually be controlled to be 0.3~0.5 m / s.

[0037] Compared with the prior art, the technical solution provided by the present invention produces the following beneficial technical effects:

[0038] 1. The present invention provides an ultraviolet-ozone water disinfection device for cooling lamp tubes and synchronously producing ozone, wherein the water disinfection device sets a metal mesh microwave resonant cavity with a 185 / 254 nm dual-wavelength electrodeless ultraviolet lamp tube inside in a quartz sleeve, connects the metal mesh microwave resonant cavity to a microwave generator via a waveguide, connects the inlet end of the quartz sleeve to a blower and an oxygen supply device via an air inlet pipe and an air inlet delivery pipe, connects the outlet end of the quartz sleeve to an ozone delivery pipe microporous aeration disk via an air outlet pipe, and is provided with a matching control box, a temperature sensor, an ozone concentration detector, and a solenoid valve for controlling the oxygen input amount. Through the above structural design, the water disinfection device of the present invention can use a large flow of air or air / oxygen mixed gas as a cooling gas to cool the 185 / 254 nm dual-wavelength ultraviolet lamp tube and synchronously and efficiently produce ozone, effectively coupling the ultraviolet disinfection effect and the ozone disinfection effect during the water disinfection process. Compared with the prior art method of directly immersing a dual-wavelength electrodeless ultraviolet lamp in water to convert dissolved oxygen in the water into ozone, the device of the present invention has a special cooling gas channel outside the microwave resonant cavity. While the cooling gas cools the dual-wavelength ultraviolet lamp tube, the ultraviolet light with a wavelength of 185 nm generated by the dual-wavelength ultraviolet lamp tube can efficiently convert the oxygen in the cooling gas into ozone, effectively improving the ozone yield. Therefore, the promoting effect of ozone on water disinfection can be more fully utilized, effectively improving the water disinfection effect.

[0039] 2. The ultraviolet-ozone water disinfection device for cooling the lamp tube and synchronously producing ozone of the present invention places a metal mesh microwave resonant cavity in a quartz sleeve, and connects the outlet end of the quartz sleeve to a microporous aeration disk via an air outlet pipe and an ozone delivery pipe. Since the ozone delivery pipe is a soft pipe, the placement position of the microporous aeration disk is flexibly adjustable during the actual water disinfection process. The microporous aeration disk can be placed within the ultraviolet irradiation range of the 185 / 254 nm dual-wavelength electrodeless ultraviolet lamp, upstream or downstream of the ultraviolet irradiation range, depending on the water quality of the water body to be disinfected. Thus, it can be flexibly used to disinfect water bodies with different water quality conditions, and has the characteristics of a wide range of applications. For example, when the microporous aeration plate is placed within the ultraviolet irradiation range of the 185 / 254 nm dual-wavelength electrodeless ultraviolet lamp, it is suitable for the situation where the water contains a large number of microorganisms but the content of organic matter, inorganic matter and other substances that absorb ultraviolet rays in the water is relatively low. The free radicals generated by ozone in the water and ultraviolet rays are used to simultaneously disinfect the water; when the microporous aeration plate is placed upstream of the ultraviolet irradiation range of the 185 / 254 nm dual-wavelength electrodeless ultraviolet lamp, it is suitable for the situation where the water to be disinfected contains a large number of organic matter, inorganic matter and other substances that absorb ultraviolet rays. The free radicals generated in the water by ozone at the front end of ultraviolet disinfection are used to degrade the organic and inorganic substances in the water, effectively improving the penetration of ultraviolet rays in the water, improving the utilization rate of ultraviolet rays and the ultraviolet water disinfection effect; the microporous aeration plate is placed at the upstream of the ultraviolet irradiation range of the 185 / 254 nm dual-wavelength electrodeless ultraviolet lamp. When it is downstream of the ultraviolet irradiation range of the nm dual-wavelength electrodeless ultraviolet lamp tube, it is suitable for the situation where the content of organic and inorganic substances that absorb ultraviolet light in the water body is relatively low, but the microbial resurrection is more obvious after ultraviolet disinfection. Ozone treatment is performed at the back end of ultraviolet disinfection to prevent the resurrection of microorganisms.

[0040] 3. Based on the above-mentioned ultraviolet-ozone water disinfection device that cools the lamp tube and produces ozone synchronously, the present invention also provides an ultraviolet-ozone water disinfection method that cools the lamp tube and produces ozone synchronously. The method disinfects the water body to be disinfected through the ultraviolet disinfection effect and the ozone disinfection effect as well as the degradation effect of ozone on pollutants. Compared with the prior art method of using ultraviolet rays alone to disinfect water, the method of the present invention can effectively improve the water disinfection effect. At the same time, the method of the present invention has good applicability to water bodies of different water qualities and has the characteristics of good controllability and adjustability. For example, the present invention has been verified through experiments: for water bodies with high turbidity, the method of the present invention forms an ozone-ultraviolet disinfection process by placing a microporous aeration disk at the front end of ultraviolet disinfection, which can effectively reduce the turbidity of the water body entering the ultraviolet disinfection end, improve the penetration of ultraviolet rays into the water body, and enhance the disinfection effect on the water body; for water bodies with high microbial concentration but relatively low turbidity, the method of the present invention forms an ozone / ultraviolet synchronous water disinfection process by placing a microporous aeration disk within the irradiation range of ultraviolet disinfection, which can effectively kill microorganisms in the water body; for water bodies with relatively low turbidity but microorganisms are prone to revival after ultraviolet disinfection, the method of the present invention forms an ultraviolet-ozone disinfection process by placing a microporous aeration disk at the rear end of ultraviolet disinfection, which can effectively prevent the revival of microorganisms after ultraviolet disinfection. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] Figure 1 It is a schematic diagram of the structure of the ultraviolet-ozone water disinfection device for cooling lamp tubes and synchronously producing ozone as described in Example 1, and the arrows in the figure indicate the gas flow direction used by the device.

[0042] Figure 2 It is a schematic diagram of the arrangement of the quartz sleeves of the water disinfection device described in Example 2 in a 4×3 planar array. The arrows in the figure indicate the direction of water flow when the device is in use.

[0043] Figure 3 These are the electron paramagnetic resonance spectroscopy test results of the water samples in Example 5 and Comparative Examples 2-3.

[0044] Explanation of the accompanying drawings: 1 is a control box, 2 is a blower, 3 is an air inlet duct, 401 is an air inlet duct, 402 is an air outlet duct, 5 is a cooling fan, 6 is a microwave generator, 7 is a waveguide, 8 is a microwave resonant cavity, 9 is a 185 / 254 nm dual-wavelength electrodeless ultraviolet lamp, 10 is a quartz sleeve, 11 is an ozone delivery pipe, 12 is a one-way valve, 13 is a microporous aeration disk, 14 is a temperature sensor, 15 is a solenoid valve, 16 is an oxygen supply equipment, 17 is an ozone concentration monitor, and 18 is a support. DETAILED DESCRIPTION

[0045] The following examples further illustrate the ultraviolet-ozone water disinfection device and method for cooling the lamp tube and synchronously producing ozone provided by the present invention. 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. Those skilled in the art can make some non-essential improvements and adjustments to the present invention according to the above invention content and implement them specifically, which still falls within the scope of protection of the present invention.

[0046] Example 1

[0047] In this embodiment, an ultraviolet-ozone water disinfection device is provided which cools the lamp tube and produces ozone simultaneously.

[0048] An ultraviolet-ozone water disinfection device that cools the lamp tube and produces ozone simultaneously, the structural schematic diagram of which is shown in FIG. Figure 1 As shown, it includes an electrodeless ultraviolet disinfection unit, a synchronous cooling ozone production unit, an ozone disinfection unit and a control unit.

[0049] The number of the electrodeless ultraviolet disinfection units is four groups, and each group of electrodeless ultraviolet disinfection units includes a microwave generator 6, a waveguide 7, a microwave resonant cavity 8 and a 185 / 254 nm dual-wavelength electrodeless ultraviolet lamp 9. The microwave resonant cavity 8 is a metal mesh microwave resonant cavity, and the metal mesh microwave resonant cavity is cylindrical with open ends. The microwave generator 6 is provided with a heat dissipation fan 5. The synchronous cooling ozone production unit includes a blower 2, an air inlet pipe 401, an air outlet pipe 402, a quartz sleeve 10 and an oxygen supply device 16, and the blower 2 includes a power adjustment device. The ozone disinfection unit includes an ozone delivery pipe 11, a one-way valve 12 and a microporous aeration disk 13. The control unit includes a control box 1, a temperature sensor 14, a solenoid valve 15 and an ozone concentration monitor 17.

[0050] The microwave generator 6 in this embodiment is a magnetron, and the waveguide 7 is a rectangular waveguide. The output end of the magnetron is directly connected to the input end of the rectangular waveguide, and the output end of the rectangular waveguide is connected to the input end of the microwave resonant cavity 8 through a flange. The microwave generated by the magnetron is transmitted to the microwave resonant cavity 8 through the rectangular waveguide. Seven 185 / 254 nm dual-wavelength electrodeless ultraviolet lamp tubes 9 are fixedly arranged in each microwave resonant cavity 8 through a fixing part. Each 185 / 254 nm dual-wavelength electrodeless ultraviolet lamp tube 9 is arranged along the length direction of the microwave resonant cavity 8. The seven 185 / 254 nm dual-wavelength electrodeless ultraviolet lamp tubes 9 in each microwave resonant cavity 8 are arranged in each microwave resonant cavity 8 in a centrally symmetrical manner. A quartz sleeve 10 is respectively provided outside each microwave resonant cavity 8, and each quartz sleeve 10 is arranged along the length direction of the microwave resonant cavity 8; the outer diameter of the microwave resonant cavity 8 is 90 mm, the inner diameter of the quartz sleeve 10 is about 96 mm, and the wall thickness of the quartz sleeve is 3 mm, that is, the distance between the outer wall of the microwave resonant cavity 8 and the inner wall of the quartz sleeve 10 is 3 mm; the length of each microwave resonant cavity 8 is equal to that of the quartz sleeve 10, and the ratio of the length of each 185 / 254 nm dual-wavelength ultraviolet lamp tube to the microwave resonant cavity 8 is 0.8:1.

[0051] One end of the air inlet pipe 401 and the air outlet pipe 402 is open and the other end is closed. The air inlet pipe 401 and the air outlet pipe 402 are stainless steel pipes with a rectangular cross-section. The inner walls of the air inlet pipe 401 and the air outlet pipe 402 are provided with an anti-ozone corrosion coating, and the anti-ozone coating is a fluorocarbon coating. The air inlet pipe 401 and the air outlet pipe 402 are each provided with four connecting holes whose sizes match the quartz sleeve 10. The two ends of each quartz sleeve 10 are respectively connected to the connecting holes on the air inlet pipe 401 and the air outlet pipe 402. The microwave resonant cavity 8 is located in the connecting space formed by the quartz sleeve 10, the air inlet pipe 401 and the air outlet pipe 402. The air inlet pipe 401 is provided with four mounting holes. The output end of the rectangular waveguide extends into the air inlet pipe 401 through the mounting holes and is connected to the microwave resonant cavity 8 through a flange. The air inlet pipe 401 and the air outlet pipe 402 are both arranged horizontally, the air inlet pipe 401 is located above the air outlet pipe 402, each quartz sleeve 10 is arranged perpendicular to the horizontal plane, and each quartz sleeve 10 is arranged in a linear array, the distance between adjacent quartz sleeves 10 is 25 cm, and the microwave generator 6 is located above the air inlet pipe 401. The air inlet pipe 401 and the air outlet pipe 402 are supported by a support 18. The open end of the air inlet pipe 401 is connected to the blower 2 and the oxygen supply device 16 through the air inlet delivery pipe 3, and the open end of the air outlet pipe 402 is connected to a plurality of microporous aeration disks 13 through the ozone delivery pipe 11 and the one-way valve 12. The ozone delivery pipe 11 is a butyl synthetic rubber pipe resistant to ozone corrosion, and the microporous aeration disk 13 is made of corrosion-resistant material. During use of the water disinfection device, the microporous aeration plate 13 can be placed within the ultraviolet irradiation range of the 185 / 254 nm dual-wavelength electrodeless ultraviolet lamp 9 to form an ozone / ultraviolet synchronous water disinfection process, or the microporous aeration plate 13 can be placed upstream of the ultraviolet irradiation range of the 185 / 254 nm dual-wavelength electrodeless ultraviolet lamp 9 to form an ozone-ultraviolet water disinfection process, or the microporous aeration plate 13 can be placed downstream of the ultraviolet irradiation range of the 185 / 254 nm dual-wavelength electrodeless ultraviolet lamp 9 to form an ultraviolet-ozone water disinfection process.

[0052] The temperature sensor 14 is located between the microwave resonant cavity 8 and the quartz sleeve 10, specifically arranged in the middle of the microwave resonant cavity 8. The probe of the ozone concentration monitor 17 is located on the outside of the ozone delivery pipe 11 between the one-way valve 12 and the microporous aeration disk 13, specifically arranged on the outside of the ozone delivery pipe 11 close to the microporous aeration disk 13. The solenoid valve 15 is located at the oxygen outlet of the oxygen supply equipment 16.

[0053] The microwave generator 6, the power regulating device of the blower 2, the solenoid valve 15, the temperature sensor 14, and the ozone concentration monitor 17 are all connected to the control box 1 by signal. Specifically, the microwave generator 6, the power regulating device of the blower 2, the solenoid valve 15, and the ozone concentration monitor 17 are connected to the control box 1 via cables, and the temperature sensor 14 is wirelessly connected to the control box 1.

[0054] During the use of the water disinfection device, the temperature sensor 14 transmits the detected temperature signal to the control box 1. When the temperature is higher than the set temperature threshold, the control box 1 adjusts the air input of the blower 2 by adjusting the power adjustment device of the blower 2, so that the temperature of the microwave resonance cavity 8 does not exceed the set temperature threshold. At the same time, the ozone concentration monitor 17 transmits the detected ozone concentration signal to the control box 1. When the ozone concentration is outside the set ozone concentration range, the control box 1 adjusts the oxygen input by adjusting the opening degree of the solenoid valve 15, so that the ozone concentration in the wastewater is within the set ozone concentration range.

[0055] Example 2

[0056] In this embodiment, the structure of the ultraviolet-ozone water disinfection device for cooling the lamp tube and synchronously generating ozone is basically the same as that of Embodiment 1, except that: the number of the electrodeless ultraviolet disinfection units is twelve, and each quartz sleeve 10 is arranged in a 4×3 planar array, such as Figure 2 As shown, Figure 2 The arrows in the figure indicate the direction of water flow when the device is in use. Specifically, three air inlet pipes 401 and three air outlet pipes 402 are provided. Each air inlet pipe 401 and each air outlet pipe 402 is provided with four connecting holes of a size matching the quartz sleeve 10. The two ends of each quartz sleeve 10 are respectively connected to the connecting holes on the air inlet pipe 401 and the air outlet pipe 402. The open end of each air inlet pipe 401 is connected to the air inlet delivery pipe 3 through a pipe fitting, and the open end of each air outlet pipe 402 is connected to the ozone delivery pipe 11 through a pipe fitting. In the same row, the distance between adjacent quartz sleeves 10 is 20 cm, and in the same column, the distance between adjacent quartz sleeves 10 is 20 cm. Six 185 / 254 nm dual-wavelength electrodeless ultraviolet lamps 9 are fixedly arranged in each microwave resonant cavity 8 through a fixing member. The outer diameter of the microwave resonant cavity 8 is 100 mm, the inner diameter of the quartz sleeve 10 is about 116 mm, and the wall thickness of the quartz sleeve 10 is 3 mm, that is, the distance between the outer wall of the microwave resonant cavity 8 and the inner wall of the quartz sleeve 10 is 8 mm; the length of the 185 / 254 nm dual-wavelength ultraviolet lamp tube 9 is equal to that of the microwave resonant cavity 8.

[0057] Example 3

[0058] In this embodiment, the structure of the ultraviolet-ozone water disinfection device for cooling the lamp tube and synchronously producing ozone is basically the same as that of Example 1, except that: the number of the electrodeless ultraviolet disinfection units is twenty-four groups, and each quartz sleeve 10 is arranged in a 6×4 planar array, specifically, four air inlet pipes 401 and four air outlet pipes 402 are arranged, and each air inlet pipe 401 and each air outlet pipe 402 are provided with six connecting holes whose sizes match the quartz sleeve 10, and the two ends of each quartz sleeve 10 are respectively connected to the connecting holes on the air inlet pipe 401 and the air outlet pipe 402, and the open end of each air inlet pipe 401 is connected to the air inlet delivery pipe 3 through a pipe fitting, and the open end of each air outlet pipe 402 is connected to the ozone delivery pipe 11 through a pipe fitting; in the same row, the distance between adjacent quartz sleeves 10 is 15 cm, and in the same column, the distance between adjacent quartz sleeves 10 is 15 cm, and each microwave resonant cavity 8 is fixed with nine 185 / 254 nm dual-wavelength electrodeless ultraviolet lamp tube 9; the outer diameter of the microwave resonant cavity 8 is 100 mm, the inner diameter of the quartz sleeve 10 is about 130 mm, and the wall thickness of the quartz sleeve 10 is 3 mm, that is, the distance between the outer wall of the microwave resonant cavity 8 and the inner wall of the quartz sleeve 10 is 15 mm; the ratio of the length of the 185 / 254 nm dual-wavelength ultraviolet lamp tube 9 to the microwave resonant cavity 8 is 0.9:1.

[0059] Example 4

[0060] In this embodiment, the treatment of wastewater in a disinfection channel of a sewage treatment plant is taken as an example to illustrate the ultraviolet-ozone water disinfection method of cooling lamps and synchronously producing ozone according to the present invention. The length of the disinfection channel is 3 m and the width is 1 m. The fecal coliform group concentration of the water entering the disinfection channel is 2×10 5 CFU / L, turbidity is 0.6 NTU. Considering that the turbidity of the wastewater is high, the pollutants in the wastewater easily absorb ultraviolet rays, causing ultraviolet loss and reducing the penetration of ultraviolet rays in water. This embodiment adopts ozone-ultraviolet water disinfection process, and the specific operation is as follows:

[0061] The quartz sleeve 10, the microporous aeration disk 13 and the probe of the ozone concentration monitor 17 of the water disinfection device described in Example 1 are immersed in the water in the disinfection channel, and the air inlet pipe 401 of the water disinfection device is arranged perpendicular to the length direction of the disinfection channel. The microporous aeration disk 13 is located upstream of the ultraviolet irradiation range of the 185 / 254 nm dual-wavelength electrodeless ultraviolet lamp 9, and the probe of the ozone concentration monitor 17 is located in the aeration area of ​​the microporous aeration disk 13. The water flow velocity in the disinfection channel is controlled to be 0.3 m / s, and the water flow in the disinfection channel flows between the outer walls of each quartz sleeve 10.

[0062] The microwave generator 6 is turned on to excite the 185 / 254 nm dual-wavelength electrodeless ultraviolet lamp 9 to generate ultraviolet rays with wavelengths of 254 nm and 185 nm. The blower 2 or the blower 2 and the oxygen supply device 16 are turned on to convey air or a mixture of air and oxygen into the air inlet pipe 401 as cooling gas. The cooling gas conveyed to the quartz sleeve 10 cools the 185 / 254 nm dual-wavelength electrodeless ultraviolet lamp 9, and the oxygen in the cooling gas is converted into ozone under the action of ultraviolet rays with a wavelength of 185 nm. The ozone is collected in the air outlet pipe 402 and conveyed to the microporous aeration disk 13 through the ozone conveying pipe 11. After being aerated by the microporous aeration disk 13, it enters the water in the disinfection channel, disinfects the water in the disinfection channel and degrades pollutants in the water. At the same time, the ultraviolet rays with a wavelength of 254 nm disinfect the water in the disinfection channel.

[0063] During the process of disinfecting the water in the disinfection channel, the temperature sensor 14 transmits the detected temperature signal to the control box 1. When the temperature detected by the temperature sensor 14 is higher than 45°C, the control box 1 adjusts the air input of the blower 2 by adjusting the power adjustment device of the blower 2, so that the temperature in the quartz sleeve 10 does not exceed 45°C; the ozone concentration monitor 17 transmits the detected ozone concentration signal in the water to the control box 1. When the ozone concentration in the water is not within the concentration range of 0.5~1.5mg / L, the control box 1 adjusts the oxygen input by adjusting the opening degree of the solenoid valve 15, so that the ozone concentration in the water is within the concentration range of 0.5~1.5 mg / L.

[0064] During the disinfection process of the water in the disinfection channel, an air collecting hood is set on the water surface of the aeration area of ​​the microporous aeration disk 13, so that the lower end of the air collecting hood is located below the water surface to collect unused ozone, and the collected ozone is absorbed in potassium iodide absorption liquid to prevent ozone from escaping and polluting the air.

[0065] When the water flow in the disinfection channel reached stability, water samples were taken from the area between the downstream of the aeration area of ​​the microporous aeration disk 13 and the upstream of the quartz sleeve 10 to test the turbidity. The results showed that after ozone treatment, the turbidity of the water in the disinfection channel was reduced from 0.6 NTU to 0.3 NTU. Water samples were taken at the outlet of the disinfection channel to detect the fecal coliform concentration, and the fecal coliform inactivation rate was calculated, and the result was a 4-log inactivation rate.

[0066] The water disinfection device was operated continuously for 4 hours. During the operation, the temperature in the quartz sleeve 10 detected by the temperature sensor 14 was always maintained between 35 and 45°C. Compared with when the water disinfection device just started to operate, the optical power of the 185 / 254nm dual-wavelength electrodeless ultraviolet lamp 9 was basically not reduced after 4 hours of continuous operation. After the water disinfection device was operated continuously for 4 hours, water samples were taken at the outlet of the disinfection channel to detect the fecal coliform group concentration, and the fecal coliform group inactivation rate was calculated. The result was still a 4-log inactivation rate.

[0067] Comparative Example 1

[0068] In this comparative example, the wastewater in the disinfection channel of a sewage treatment plant described in Example 4 was disinfected. The fecal coliform group concentration of the influent of the disinfection channel was 2×10 5 CFU / L, turbidity is 0.6 NTU.

[0069] The operation of this comparative example is basically the same as that of Example 4, except that the blower 2 is not turned on, and the oxygen supply device 16 is not turned on, that is, during the water disinfection process, the 185 / 254 nm dual-wavelength electrodeless ultraviolet lamp 9 is not cooled, and air or oxygen is not introduced to produce ozone under 185 nm ultraviolet irradiation.

[0070] When the water flow in the disinfection channel reached stability, water samples were taken at the outlet of the disinfection channel to test the turbidity and detect the fecal coliform concentration, and the fecal coliform inactivation rate was calculated. The results showed that the fecal coliform inactivation rate was 3 logarithmic inactivation rate, and the turbidity did not change relative to the turbidity of the disinfection channel inlet water, and remained at 0.6 NTU.

[0071] After the water disinfection device was continuously operated for 5 minutes, the temperature in the quartz sleeve 10 detected by the temperature sensor 14 was 103°C. After the water disinfection device was continuously operated for 2 hours, the optical power of the 185 / 254 nm dual-wavelength electrodeless ultraviolet lamp 9 decreased by 30% compared with when the water disinfection device just started to operate. At this time, water samples were taken at the outlet of the disinfection channel to test the turbidity and detect the fecal coliform concentration, and the fecal coliform inactivation rate was calculated. The results showed that the turbidity was still 0.6 NTU and the fecal coliform inactivation rate was 2.5 logarithmic inactivation rate.

[0072] It can be seen from Comparative Example 1 that relying solely on the cooling effect of the flowing water in the disinfection channel cannot effectively prevent the temperature rise of the 185 / 254nm dual-wavelength electrodeless ultraviolet lamp tube 9. As the operating time of the water disinfection device increases, the optical power of the 185 / 254 nm dual-wavelength electrodeless ultraviolet lamp tube 9 will drop significantly, and the inactivation rate of microorganisms will also decrease with the increase of operating time.

[0073] In combination with Example 4 and Comparative Example 1, it can be seen that the present invention passes air or an air / oxygen mixed gas into a quartz sleeve 10 as a cooling gas, and at the same time uses ultraviolet rays with a wavelength of 185 nm emitted by a 185 / 254 nm dual-wavelength electrodeless ultraviolet lamp 9 to convert oxygen in the cooling gas into ozone. On the basis of cooling the 185 / 254 nm dual-wavelength ultraviolet lamp and effectively preventing the reduction of the optical power of the 185 / 254 nm dual-wavelength ultraviolet lamp, ozone can be used to reduce the turbidity of the water body and increase the penetration of ultraviolet rays in the water. At the same time, ozone itself can also kill microorganisms, thereby effectively improving the inactivation rate of microorganisms in the water, and avoiding the decline in the disinfection effect of the water disinfection device after long-term continuous operation.

[0074] Example 5

[0075] In this embodiment, the wastewater in the disinfection channel of a sewage treatment plant is treated as an example to illustrate the ultraviolet-ozone water disinfection method of cooling the lamp tube and synchronously producing ozone. The disinfection channel is 3 m long and 1 m wide. The fecal coliform group concentration of the water entering the disinfection channel is 8×10 5 CFU / L, turbidity is 0.11 NTU. Considering that the turbidity of the wastewater is relatively low, but the concentration of microorganisms is high, this embodiment adopts ozone / ultraviolet synchronous water disinfection process, and the specific operation is as follows:

[0076] The quartz sleeve 10, the microporous aeration disk 13 and the probe of the ozone concentration monitor 17 of the water disinfection device described in Example 1 are immersed in the water in the disinfection channel, and the air inlet pipe 401 of the water disinfection device is arranged perpendicular to the length direction of the disinfection channel, so that the microporous aeration disk 13 is located within the ultraviolet irradiation range of the 185 / 254 nm dual-wavelength electrodeless ultraviolet lamp 9. Specifically, the microporous aeration disk 13 is located on the upstream side of the quartz sleeve 10 and is arranged close to the quartz sleeve 10, and the probe of the ozone concentration monitor 17 is located in the aeration area of ​​the microporous aeration disk 13. The water flow velocity in the disinfection channel is controlled to be 0.5 m / s, and the water flow in the disinfection channel flows between the outer walls of each quartz sleeve 10.

[0077] The microwave generator 6 is turned on to excite the 185 / 254 nm dual-wavelength electrodeless ultraviolet lamp 9 to generate ultraviolet rays with wavelengths of 254 nm and 185 nm. The blower 2 or the blower 2 and the oxygen supply device 16 are turned on to convey air or a mixture of air and oxygen into the air inlet pipe 401 as cooling gas. The cooling gas conveyed to the quartz sleeve 10 cools the 185 / 254 nm dual-wavelength electrodeless ultraviolet lamp 9, and the oxygen in the cooling gas is converted into ozone under the action of ultraviolet rays with a wavelength of 185 nm. The ozone is collected in the air outlet pipe 402 and conveyed to the microporous aeration disk 13 through the ozone conveying pipe 11. After being aerated by the microporous aeration disk 13, it enters the water in the disinfection channel, disinfects the water in the disinfection channel and degrades pollutants in the water. At the same time, the ultraviolet rays with a wavelength of 254 nm disinfect the water in the disinfection channel.

[0078] During the process of disinfecting the water in the disinfection channel, the temperature sensor 14 transmits the detected temperature signal to the control box 1. When the temperature detected by the temperature sensor 14 is higher than 45°C, the control box 1 adjusts the air input of the blower 2 by adjusting the power adjustment device of the blower 2, so that the temperature in the quartz sleeve 10 does not exceed 45°C; the ozone concentration monitor 17 transmits the detected ozone concentration signal in the water to the control box 1. When the ozone concentration in the water is not within the concentration range of 0.5~1.5mg / L, the control box 1 adjusts the oxygen input by adjusting the opening degree of the solenoid valve 15, so that the ozone concentration in the water is within the concentration range of 0.5~1.5 mg / L.

[0079] During the disinfection process of the water in the disinfection channel, an air collecting hood is set on the water surface of the aeration area of ​​the microporous aeration disk 13, so that the lower end of the air collecting hood is located below the water surface to collect unused ozone, and the collected ozone is absorbed in potassium iodide absorption liquid to prevent ozone from escaping and polluting the air.

[0080] When the water flow in the disinfection channel reaches stability, water samples are taken at the outlet of the disinfection channel to detect the fecal coliform group concentration, and the fecal coliform group inactivation rate is calculated. The result is a 4-log inactivation rate. The water disinfection device is operated continuously for 4 hours. During the operation, the temperature in the quartz sleeve 10 detected by the temperature sensor 14 is always maintained between 35 and 45 ° C. Compared with when the water disinfection device just starts to operate, after 4 hours of continuous operation, the optical power of the 185 / 254 nm dual-wavelength electrodeless ultraviolet lamp 9 has basically not decreased. After the water disinfection device is operated continuously for 4 hours, water samples are taken at the outlet of the disinfection channel to detect the fecal coliform group concentration, and the fecal coliform group inactivation rate is calculated. The result is still a 4-log inactivation rate. Water samples are taken from the vicinity of the quartz sleeve 10 for electron paramagnetic resonance spectroscopy testing to detect the generation of hydroxyl radicals in the water. The results are as follows: Figure 3 shown.

[0081] Comparative Example 2

[0082] In this comparative example, the wastewater in the disinfection channel of a sewage treatment plant described in Example 5 was disinfected. The fecal coliform group concentration of the influent of the disinfection channel was 8×10 5 CFU / L, turbidity is 0.11 NTU.

[0083] The operation of this comparative example is basically the same as that of Example 5, except that the blower 2 is not turned on, and the oxygen supply device 16 is not turned on, that is, the 185 / 254 nm dual-wavelength electrodeless ultraviolet lamp 9 is not cooled during the water disinfection process, and air or oxygen is not introduced to produce ozone under the 185 nm ultraviolet irradiation. When the water flow in the disinfection channel reaches stability, a water sample is taken at the outlet of the disinfection channel to detect the fecal coliform group concentration, and the fecal coliform group inactivation rate is calculated. The result is a 3-log inactivation rate. A water sample is taken from the vicinity of the quartz sleeve 10 for electron paramagnetic resonance spectroscopy test to detect the generation of hydroxyl radicals in the water. The results are as follows: Figure 3 shown.

[0084] Comparative Example 3

[0085] In this comparative example, the wastewater in the disinfection channel of a sewage treatment plant described in Example 5 was disinfected. The fecal coliform group concentration of the influent of the disinfection channel was 8×10 5 CFU / L, turbidity is 0.11 NTU.

[0086] The microporous aeration head is immersed below the water surface, and ozone is continuously introduced into the water in the disinfection channel through the microporous aeration head so that the ozone concentration in the water in the disinfection channel is maintained within the concentration range of 0.5~1.5 mg / L. Ozone is used to disinfect water, and the water flow rate in the disinfection channel is controlled to be 0.5 m / s. In the process of disinfecting the water in the disinfection channel, an air collection hood is set on the water surface of the entire disinfection channel, so that the lower end of the air collection hood is located below the water surface, to collect unused ozone, and the collected ozone is absorbed in potassium iodide absorption liquid to prevent ozone from escaping and polluting the air.

[0087] When the water flow in the disinfection channel reaches a stable state and the ozone concentration in the water is stable within the range of 0.5~1.5 mg / L, water samples are taken at the outlet of the disinfection channel to test the fecal coliform concentration and calculate the fecal coliform inactivation rate. The result is 1.5 logarithmic inactivation rate. Water samples are taken from the microporous aeration disk for electron paramagnetic resonance spectroscopy test to detect the generation of hydroxyl free radicals in the water. The results are as follows: Figure 3 shown.

[0088] Depend on Figure 3It can be seen that compared with the case where ozone treatment is used alone in Example 3, more hydroxyl radicals can be generated in the water in the disinfection channel when ultraviolet treatment is used alone in Example 2. Compared with the case where ultraviolet treatment is used alone in Example 2, when ozone / ultraviolet simultaneous water disinfection process is used for treatment, the amount of hydroxyl radicals generated in the water in the disinfection channel is further improved. This is mainly because ozone will accelerate the decomposition into oxygen atoms under the irradiation of ultraviolet rays, and the oxygen atoms react with water to generate a large number of hydroxyl radicals.

[0089] Example 6

[0090] In this embodiment, the treatment of wastewater in a disinfection channel of a sewage treatment plant is taken as an example to illustrate the ultraviolet-ozone water disinfection method of cooling lamps and synchronously producing ozone according to the present invention. The length of the disinfection channel is 3 m and the width is 1 m. The fecal coliform group concentration of the water entering the disinfection channel is 6.5×10 5 CFU / L, turbidity is 0.10 NTU. Considering that the turbidity of the wastewater is relatively low, but the concentration of microorganisms is relatively high, the ultraviolet disinfection process alone is prone to the risk of microbial resurrection. In this embodiment, the ultraviolet-ozone water disinfection process is used, and the specific operation is as follows:

[0091] The quartz sleeve 10, the microporous aeration plate 13 and the probe of the ozone concentration monitor 17 of the water disinfection device described in Example 1 are immersed in the water in the disinfection channel, and the air inlet pipe 401 of the water disinfection device is arranged perpendicular to the length direction of the disinfection channel. The microporous aeration plate 13 is located downstream of the ultraviolet irradiation range of the 185 / 254 nm dual-wavelength electrodeless ultraviolet lamp 9, and the probe of the ozone concentration monitor 17 is located in the aeration area of ​​the microporous aeration plate 13. The water flow velocity in the disinfection channel is controlled to be 0.4 m / s, and the water flow in the disinfection channel flows between the outer walls of each quartz sleeve 10.

[0092] The microwave generator 6 is turned on to excite the 185 / 254 nm dual-wavelength electrodeless ultraviolet lamp 9 to generate ultraviolet rays with wavelengths of 254 nm and 185 nm. The blower 2 or the blower 2 and the oxygen supply device 16 are turned on to convey air or a mixture of air and oxygen into the air inlet pipe 401 as cooling gas. The cooling gas conveyed to the quartz sleeve 10 cools the 185 / 254 nm dual-wavelength electrodeless ultraviolet lamp 9, and the oxygen in the cooling gas is converted into ozone under the action of ultraviolet rays with a wavelength of 185 nm. The ozone is collected in the air outlet pipe 402 and conveyed to the microporous aeration disk 13 through the ozone conveying pipe 11. After being aerated by the microporous aeration disk 13, it enters the water in the disinfection channel, disinfects the water in the disinfection channel and degrades pollutants in the water. At the same time, the ultraviolet rays with a wavelength of 254 nm disinfect the water in the disinfection channel.

[0093] During the process of disinfecting the water in the disinfection channel, the temperature sensor 14 transmits the detected temperature signal to the control box 1. When the temperature detected by the temperature sensor 14 is higher than 45°C, the control box 1 adjusts the air input of the blower 2 by adjusting the power adjustment device of the blower 2, so that the temperature in the quartz sleeve 10 does not exceed 45°C; the ozone concentration monitor 17 transmits the detected ozone concentration signal in the water to the control box 1. When the ozone concentration in the water is not within the concentration range of 0.5~1.5mg / L, the control box 1 adjusts the oxygen input by adjusting the opening degree of the solenoid valve 15, so that the ozone concentration in the water is within the concentration range of 0.5~1.5 mg / L.

[0094] During the disinfection process of the water in the disinfection channel, an air collecting hood is set on the water surface of the aeration area of ​​the microporous aeration disk 13, so that the lower end of the air collecting hood is located below the water surface to collect unused ozone, and the collected ozone is absorbed in potassium iodide absorption liquid to prevent ozone from escaping and polluting the air.

[0095] When the water flow in the disinfection channel reached stability, water samples were taken at the outlet of the disinfection channel to test the fecal coliform group concentration and calculate the fecal coliform group inactivation rate, which was a 4-log inactivation rate. At the same time, water samples were taken at the outlet of the disinfection channel for a fecal coliform group resurrection experiment, and the maximum fecal coliform group resurrection rate was calculated, which was 2.90%.

[0096] Comparative Example 4

[0097] In this comparative example, the wastewater in the disinfection channel of a sewage plant described in Example 6 was disinfected. The fecal coliform group concentration of the influent of the disinfection channel was 6.5×10 5 CFU / L, turbidity is 0.10 NTU.

[0098] The operation of this comparative example is basically the same as that of Example 4, except that the microporous aeration disk 13 is not placed in the disinfection channel, and the ozone generated during the water disinfection process is directly introduced into the gas collecting hood, and the ozone collected by the gas collecting hood is absorbed in the potassium iodide absorption liquid to prevent ozone from escaping and polluting the air, that is, in this comparative example, ozone does not participate in disinfection.

[0099] When the water flow in the disinfection channel reached stability, water samples were taken at the outlet of the disinfection channel to test the fecal coliform group concentration and calculate the fecal coliform group inactivation rate, which was a 3-log inactivation rate. Water samples were taken at the outlet of the disinfection channel to conduct a fecal coliform group resurrection experiment and calculate the maximum fecal coliform group resurrection rate, which was 16.10%.

[0100] Combining Example 6 with Comparative Example 4, it can be seen that the microbial inactivation rate of comparative example 4 using ultraviolet light for disinfection is low, and the risk of microbial resurrection is high, because ultraviolet light disinfection only destroys the DNA structure of microorganisms, and some microorganisms have special repair mechanisms that can repair damaged DNA. Example 6 uses ultraviolet light-ozone water disinfection process for disinfection, and the microbial inactivation rate is higher and the microbial resurrection rate is lower. This is mainly because after ultraviolet light disinfection, the secondary disinfection of ozone can destroy the cell membrane and other structures of the microorganisms, and the microorganisms cannot be revived.

[0101] Example 7

[0102] In this embodiment, the treatment of wastewater in a disinfection channel of a sewage treatment plant is taken as an example to illustrate the ultraviolet-ozone water disinfection method of cooling lamps and synchronously producing ozone according to the present invention. The length of the disinfection channel is 3 m and the width is 1 m. The fecal coliform group concentration of the water entering the disinfection channel is 5×10 5 CFU / L, turbidity is 0.55 NTU. This embodiment adopts ozone-ultraviolet water disinfection process, and the specific operation is basically the same as that of Example 4, except that: the water disinfection device described in Example 2 is used, and the water flow rate in the disinfection channel is controlled to be 0.5 m / s.

[0103] When the water flow in the disinfection channel reached stability, water samples were taken from the area between the downstream of the aeration area of ​​the microporous aeration disk 13 and the upstream of the quartz sleeve 10 to test the turbidity. The results showed that after ozone treatment, the turbidity of the water in the disinfection channel was reduced from 0.55 NTU to 0.13 NTU. Water samples were taken at the outlet of the disinfection channel to detect the fecal coliform concentration, and the fecal coliform inactivation rate was calculated, and the result was a 5-log inactivation rate.

[0104] The water disinfection device was operated continuously for 4 hours. During the operation, the temperature in the quartz sleeve 10 detected by the temperature sensor 14 was always maintained between 35 and 45°C. Compared with when the water disinfection device just started to operate, the optical power of the 185 / 254nm dual-wavelength electrodeless ultraviolet lamp 9 was basically not reduced after 4 hours of continuous operation. After the water disinfection device was operated continuously for 4 hours, water samples were taken at the outlet of the disinfection channel to detect the fecal coliform group concentration, and the fecal coliform group inactivation rate was calculated. The result was still a 5-log inactivation rate.

[0105] Example 8

[0106] In this embodiment, the treatment of wastewater in a disinfection channel of a sewage treatment plant is taken as an example to illustrate the ultraviolet-ozone water disinfection method of cooling lamps and synchronously producing ozone according to the present invention. The length of the disinfection channel is 3 m and the width is 1 m. The fecal coliform group concentration of the water entering the disinfection channel is 8.5×10 5CFU / L, turbidity is 0.10 NTU. In this embodiment, ozone / ultraviolet synchronous water disinfection process is adopted, and the specific operation is basically the same as that of Example 5, except that: the water disinfection device described in Example 3 is used, and the water flow rate in the disinfection channel is controlled to be 0.4 m / s.

[0107] When the water flow in the disinfection channel reaches stability, water samples are taken at the outlet of the disinfection channel to detect the fecal coliform group concentration, and the fecal coliform group inactivation rate is calculated, and the result is a 5-log inactivation rate. The water disinfection device is continuously operated for 4 hours. During the operation, the temperature in the quartz sleeve 10 detected by the temperature sensor 14 is always maintained between 35 and 45 ° C. Compared with when the water disinfection device just starts to operate, after 4 hours of continuous operation, the optical power of the 185 / 254 nm dual-wavelength electrodeless ultraviolet lamp 9 has basically not decreased. After the water disinfection device is continuously operated for 4 hours, water samples are taken at the outlet of the disinfection channel to detect the fecal coliform group concentration, and the fecal coliform group inactivation rate is calculated. The result is still a 5-log inactivation rate.

Claims

1. An ultraviolet-ozone water disinfection device for cooling lamp tubes and synchronously producing ozone, comprising an electrodeless ultraviolet disinfection unit, characterized in that: It also includes a synchronous cooling ozone generating unit, an ozone disinfection unit and a control unit; The number of the electrodeless ultraviolet disinfection units is multiple, and each group of the electrodeless ultraviolet disinfection units includes a microwave generator (6), a waveguide (7), a microwave resonant cavity (8) and a 185 / 254 nm dual-wavelength electrodeless ultraviolet lamp tube (9), wherein the microwave resonant cavity (8) is a metal mesh microwave resonant cavity, and the microwave generator (6) is provided with a heat dissipation fan (5); the synchronous cooling ozone production unit includes a blower (2), an air inlet pipe (401), an air outlet pipe (402), a quartz sleeve (10) and an oxygen supply device (16), and the blower (2) includes a power adjustment device; the ozone disinfection unit includes an ozone delivery pipe (11), a one-way valve (12) and a microporous aeration disk (13); the control unit includes a control box (1), a temperature sensor (14), a solenoid valve (15) and an ozone concentration monitor (17); The microwave generator (6) is connected to the microwave resonant cavity (8) via a waveguide (7); each microwave resonant cavity (8) is provided with a 185 / 254 nm dual-wavelength electrodeless ultraviolet lamp tube (9); each microwave resonant cavity (8) is respectively provided with a quartz sleeve (10); one end of the air inlet pipe (401) and the air outlet pipe (402) is open and the other end is closed; the air inlet pipe (401) and the air outlet pipe (402) are respectively provided with connecting holes of a number and size matching the quartz sleeve (10); the two ends of each quartz sleeve (10) are respectively connected to the connecting holes on the air inlet pipe (401) and the air outlet pipe (402); the microwave resonant cavity (8) is located in a connected space formed by the quartz sleeve (10) and the air inlet pipe (401) and the air outlet pipe (402). The open end of the air inlet pipe (401) is connected to the blower (2) and the oxygen supply device (16) through the air inlet delivery pipe (3), and the open end of the air outlet pipe (402) is connected to the microporous aeration disk (13) through the ozone delivery pipe (11) via the one-way valve (12); the temperature sensor (14) is located between the microwave resonant cavity (8) and the quartz sleeve (10), the probe of the ozone concentration monitor (17) is located on the outside of the ozone delivery pipe (11) between the one-way valve (12) and the microporous aeration disk (13), and the solenoid valve (15) is located at the oxygen outlet of the oxygen supply device (16); The microwave generator (6), the power adjustment device of the blower (2), the solenoid valve (15), the temperature sensor (14), and the ozone concentration monitor (17) are all connected to the control box (1).

2. The ultraviolet-ozone water disinfection device for cooling lamp tubes and synchronously producing ozone according to claim 1, characterized in that: The 185 / 254 nm dual-wavelength electrodeless ultraviolet lamp tubes (9) are arranged along the length direction of the microwave resonant cavity (8), and each microwave resonant cavity (8) is provided with a plurality of 185 / 254 nm dual-wavelength electrodeless ultraviolet lamp tubes (9).

3. The ultraviolet-ozone water disinfection device for cooling lamp tubes and synchronously producing ozone according to claim 2 is characterized in that: Each 185 / 254 nm dual-wavelength electrodeless ultraviolet lamp tube (9) is arranged in a centrally symmetrical manner in the microwave resonant cavity (8), and each microwave resonant cavity (8) is provided with 6 to 9 185 / 254 nm dual-wavelength electrodeless ultraviolet lamp tubes (9).

4. The ultraviolet-ozone water disinfection device for cooling lamp tubes and synchronously producing ozone according to claim 1, characterized in that: The air inlet pipe (401) and the air outlet pipe (402) are parallel to each other, the air inlet pipe (401) is located above the air outlet pipe (402), and the quartz sleeves (10) are parallel to each other; the distance between adjacent quartz sleeves (10) is 15 to 25 cm.

5. The ultraviolet-ozone water disinfection device for cooling lamp tubes and synchronously producing ozone according to any one of claims 1 to 4, characterized in that: The control box (1) adjusts the air input amount of the blower (2) according to the temperature signal fed back by the temperature sensor (14), and the control box (1) adjusts the opening degree of the solenoid valve (15) and thus adjusts the oxygen input amount according to the ozone concentration signal fed back by the ozone concentration monitor (17).

6. The ultraviolet-ozone water disinfection device for cooling lamp tubes and synchronously producing ozone according to any one of claims 1 to 4, characterized in that: The number of the electrodeless ultraviolet disinfection units is at least 3 groups.

7. The ultraviolet-ozone water disinfection device for cooling lamp tubes and synchronously producing ozone according to any one of claims 1 to 4, characterized in that: The distance between the outer wall of the microwave resonant cavity (8) and the inner wall of the quartz sleeve (10) is 3 to 15 mm.

8. A UV-ozone water disinfection method for cooling lamp tubes and synchronously producing ozone, characterized in that: The method adopts the water disinfection device according to claim 1, and the steps are as follows: The quartz sleeve (10), the microporous aeration disk (13) and the probe of the ozone concentration monitor (17) of the water disinfection device according to claim 1 are immersed in the flowing water to be disinfected, so that the water to be disinfected flows through the quartz sleeve (10), the microwave generator (6) is turned on to excite the 185 / 254 nm dual-wavelength electrodeless ultraviolet lamp (9) to generate ultraviolet rays with wavelengths of 254 nm and 185 nm, and the blower or the blower and the oxygen supply device (16) are turned on to convey air or a mixture of air and oxygen into the air inlet pipe (401) as cooling gas, and while the cooling gas cools the 185 / 254 nm dual-wavelength electrodeless ultraviolet lamp (9), the oxygen in the cooling gas at a wavelength of 185 nm ultraviolet rays are converted into ozone; the ozone is collected in the air outlet pipe (402) and then transported to the microporous aeration disk (13) through the ozone transport pipe (11) and enters the water body, thereby disinfecting the water body and degrading pollutants in the water body. At the same time, ultraviolet rays with a wavelength of 254 nm disinfect the water body; During the process of disinfecting the water body, the temperature sensor (14) transmits a detected temperature signal to the control box (1); when the temperature is higher than a set temperature threshold, the control box (1) adjusts the air input of the blower (2) by adjusting the power adjustment device of the blower (2), so that the temperature in the quartz sleeve (10) does not exceed the set temperature threshold; the ozone concentration monitor (17) transmits a detected ozone concentration signal in the water body to the control box (1); when the ozone concentration in the water body is outside the set ozone concentration range, the control box (1) adjusts the oxygen input by adjusting the opening degree of the solenoid valve (15), so that the ozone concentration in the water body is within the set ozone concentration range.

9. The ultraviolet-ozone water disinfection method for cooling lamp tubes and synchronously producing ozone according to claim 8, characterized in that: The set temperature threshold is 45° C., and the set ozone concentration range is 0.5-1.5 mg / L.

10. The ultraviolet-ozone water disinfection method for cooling lamp tubes and synchronously producing ozone according to claim 8 or 9, characterized in that: The microporous aeration plate (13) is placed within the ultraviolet irradiation range of the 185 / 254 nm dual-wavelength electrodeless ultraviolet lamp tube (9), or the microporous aeration plate (13) is placed upstream of the ultraviolet irradiation range of the 185 / 254 nm dual-wavelength electrodeless ultraviolet lamp tube (9), or the microporous aeration plate (13) is placed downstream of the ultraviolet irradiation range of the 185 / 254 nm dual-wavelength electrodeless ultraviolet lamp tube (9).

Images