A UV-LED-based secondary water supply network terminal disinfection device

Abstract

A UV-LED-based disinfection device for the end of a secondary water supply network includes a housing and a flow meter. The housing has an inlet and an outlet; the inlet connects to a secondary water supply storage tank, and the outlet connects to the water supply pipeline. The flow meter is mounted on the water supply pipeline and connected to the control terminal of the secondary water supply system. A disinfection module is located inside the housing. The module includes a sleeve and UV-LED beads housed within the sleeve. The UV-LED beads are evenly distributed in three rows along the axial direction of the sleeve, with each row containing four different spacings of UV-LED beads. The control terminal of the secondary water supply system controls the number of UV-LED beads that are turned on and off based on the flow rate detected by the flow meter. This invention is applicable to the disinfection of urban secondary water supply systems and can automatically switch between different settings based on changes in the secondary water supply flow rate, thus saving energy.

Description

Technical Field

[0001] This invention relates to the field of water disinfection, and in particular to a UV-LED-based disinfection device for the end of a secondary water supply network. Background Technology

[0002] Drinking water quality is crucial to national health. With the rapid urbanization in China, the water quality standards of secondary water supply systems, a key feature of cities, are constantly improving. Ultraviolet (UV) disinfection is currently a research hotspot in the water treatment industry and has been applied as a routine disinfection method in secondary water supply systems. As an emerging technology in the field of UV disinfection, UV-LED has shown the potential to replace traditional mercury lamps. Furthermore, advancements in UV-LED material technology suggest that UV-LED may replace mercury lamps in the future, becoming a mature UV inactivation technology. Therefore, how to design disinfection reactors using UV-LED technology in SWS systems to ensure water quality has become a worthy research topic. However, current research on the application of UV-LED in secondary water supply systems is still very limited.

[0003] Although numerous studies have employed plug-flow reactors for the application of UV-LEDs, they generally lack the characteristics for large-scale application, and their equipment size and water treatment capacity are still insufficient. These reactors often have advantages for theoretical research, such as the ability to control parameters like wavelength, dosage, and irradiation time under laboratory conditions to observe the inactivation efficiency against different microorganisms. However, the characteristics of the device dictate that scale-up costs are high or even impossible, making it difficult to use in practical secondary water supply systems. Summary of the Invention

[0004] The purpose of this invention is to solve the above-mentioned problems in the prior art and provide a UV-LED-based disinfection device for the end of a secondary water supply network, which can automatically and efficiently disinfect the water at the end of the secondary water supply system network and save energy.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] A UV-LED-based disinfection device for the end of a secondary water supply network includes a housing and a flow meter. The housing has an inlet and an outlet. The inlet is connected to a secondary water supply storage tank, and the outlet is connected to a water supply pipeline. The flow meter is mounted on the water supply pipeline and connected to the control terminal of the secondary water supply system. A disinfection module is located inside the housing. The disinfection module includes a sleeve and UV-LED beads housed within the sleeve. The UV-LED beads are evenly distributed in three rows along the axial direction of the sleeve. Each row of UV-LED beads has four different spacings: 22.36 mm, 11.82 mm, 26.24 mm, and 33.57 mm from the inlet to the outlet. The control terminal of the secondary water supply system controls the number of UV-LED beads that are turned on and off based on the flow rate detected by the flow meter.

[0007] The wavelength of the UV-LED lamp beads is 275nm.

[0008] The sleeve is made of quartz glass.

[0009] The disinfection module also includes a heat sink, which is located on the back of the UV-LED lamp beads.

[0010] The radiator uses metal as a heat conductor for heat dissipation.

[0011] The present invention also includes a thermometer, which is disposed inside the housing and connected to the control terminal of the secondary water supply system.

[0012] The present invention also includes an irradiation intensity monitor, wherein the probe of the irradiation intensity monitor is disposed inside the housing and connected to the control terminal of the secondary water supply system.

[0013] Compared with the prior art, the beneficial effects achieved by the technical solution of this invention are:

[0014] This invention can supplement and disinfect the water at the end of the urban secondary water supply system network. It can switch the level according to the flow rate, save energy, disinfect efficiently, has a high degree of automation, requires little manual maintenance, and improves the biological safety of urban residents' drinking water.

[0015] This invention can satisfy the flow velocity range of 0 to 10 m. 3 Disinfection of the secondary water supply system per hour.

[0016] This invention features a UV-LED with a specific wavelength of 275nm to inactivate microorganisms in secondary water supply networks.

[0017] This invention achieves efficient energy utilization by setting UV-LEDs with gradually varying spacing.

[0018] The present invention features a quartz glass sleeve enclosing the UV-LED to achieve high transmittance of disinfection light and physical blocking. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the housing configuration and UV-LED arrangement of the disinfection module of the present invention;

[0020] Figure 2 This is a schematic diagram of the overall structure of the device of the present invention. Detailed Implementation

[0021] To make the technical problems, technical solutions and beneficial effects of the present invention clearer and more understandable, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments.

[0022] Example 1

[0023] like Figures 1-2 As shown, the UV-LED-based secondary water supply network terminal disinfection device described in this embodiment includes a UV-LED reactor, a flow meter, a thermometer, an irradiation intensity monitor, and a power supply module.

[0024] The flow meter is installed on the water supply pipeline and connected to the control terminal of the secondary water supply system; the UV-LED reactor includes a shell and a disinfection module; the thermometer is installed inside the shell and connected to the control terminal of the secondary water supply system; the probe of the irradiation intensity monitor is installed inside the shell and connected to the control terminal of the secondary water supply system; the power supply module is the function of the entire device; the shell is provided with corresponding interfaces for the above components.

[0025] The shell is provided with an inlet and an outlet. The inlet is connected to a secondary water supply storage tank (SWS storage tank), and the outlet is connected to a water supply pipe.

[0026] The disinfection module is provided inside the housing. The disinfection module includes a sleeve and UV-LED lamp beads disposed inside the sleeve. The UV-LED lamp beads are evenly distributed in three rows along the axial direction of the sleeve. Each row of UV-LED lamp beads has four different spacings. The control terminal of the secondary water supply system controls the number of UV-LED lamp beads turned on and off by detecting the flow rate through a flow meter.

[0027] In this embodiment, the wavelength of the UV-LED lamp bead is 275nm. The sleeve is made of quartz glass.

[0028] The disinfection module also includes a heat sink, which is located on the back of the UV-LED lamp beads; specifically, the heat sink uses metal heat conduction to dissipate heat.

[0029] Combining the characteristics of the secondary water supply system and UV-LED, the UV-LED reactor of the secondary water supply system should have a complete cycle, and the water flow characteristics can be changed by the structure of the UV-LED reactor's sleeve. Therefore, the problem of turbulence is relatively easier to solve. The shell configuration of this device is selected to be on the same side and in the same position.

[0030] A UV-LED with a selected 120° light emission angle can theoretically cover approximately one-third of the space facing forward, while the water flows through the disinfection module in a 360° distribution within the cavity. Therefore, to ensure uniform light distribution within the cavity without any dead zones, three UV-LEDs are grouped together and fixed at the same point in an equilateral triangle configuration, arranged at 120° intervals along the circumference of the casing. This ensures that their light coverage areas do not overlap, achieving the theoretical 360° light coverage. Furthermore, the light distribution pattern differs significantly for UV-LEDs with point-like light source characteristics.

[0031] Therefore, in order to avoid excessive local overlap of light as much as possible, and considering the hydraulic conditions of the inlet and outlet water flow, since most of the hydraulic residence time is concentrated in the mixing stage in the middle of the reactor, the UV-LED density at the beginning and end near the inlet and outlet is reduced. Figure 1 S1, S2, S3, and S4 represent the variations in unequal spacing designed according to the differences in hydraulic conditions of different cavities. In this embodiment, the four spacings from the inlet to the outlet are 22.36mm, 11.82mm, 26.24mm, and 33.57mm, respectively. This optimized distribution scheme can improve the concentrated utilization rate of energy.

[0032] When discussing flow rate and required inactivation dosage, the highest value for each setting is used to ensure that the effluent quality meets the standards. In this embodiment, the number of 0.5W, 275nm UV-LEDs required to be turned on for different settings are as follows:

[0033] ① , 3×4 UV-LEDs;

[0034] ②, 3×8 UV-LEDs;

[0035] ③ Level, 3×14 UV-LEDs;

[0036] ④ Level, 3×21 UV-LEDs;

[0037] like Figure 2As shown, considering other components required in the secondary water supply system, including thermometers, irradiance monitors, and flow meters, the operating route of the UV-LED disinfection device and related facilities in the secondary water supply system to which this device is applicable can be obtained. This invention can monitor the usage of UV-LED beads through an irradiance detector. If the UV-LED beads are damaged, they can be manually maintained to ensure the quality of disinfection.

[0038] Water enters the secondary water supply system from the municipal pipeline, stops at the secondary water supply storage tank (SWS storage tank), and then flows out through the tank's outlet pipe into the UV-LED reactor inlet. The flow meter senses the inlet flow rate, and the control terminal of the secondary water supply system adjusts the number of UV-LED lamps turned on according to the flow rate to control the irradiation level. After a complete inactivation cycle, the water flows out from the UV-LED reactor outlet into the water supply pipeline, is pressurized by the secondary water supply booster pump (SWS pump), and then delivered to the user.

[0039] In summary, this invention is applicable to disinfection of urban secondary water supply systems and can automatically switch gears according to changes in secondary water supply flow, thus saving energy.

Claims

1. A UV-LED-based disinfection device for the end of a secondary water supply network, characterized in that: The device includes a housing and a flow meter. The housing has an inlet and an outlet. The inlet is connected to a secondary water supply storage tank, and the outlet is connected to a water supply pipe. The flow meter is mounted on the water supply pipe and connected to the control terminal of the secondary water supply system. A disinfection module is located inside the housing. The disinfection module includes a sleeve and UV-LED beads housed within the sleeve. The UV-LED beads are evenly distributed in three rows along the axial direction of the sleeve. Each row of UV-LED beads has four different spacings: 22.36mm, 11.82mm, 26.24mm, and 33.57mm from the inlet to the outlet. The control terminal of the secondary water supply system controls the number of UV-LED beads that are turned on and off based on the flow rate detected by the flow meter.

2. The UV-LED-based disinfection device for the end of a secondary water supply network as described in claim 1, characterized in that: The wavelength of the UV-LED lamp beads is 275nm.

3. The UV-LED-based disinfection device for the end of a secondary water supply network as described in claim 1, characterized in that: The sleeve is made of quartz glass.

4. The UV-LED-based disinfection device for the end of a secondary water supply network as described in claim 1, characterized in that: The disinfection module also includes a heat sink, which is located on the back of the UV-LED lamp beads.

5. The UV-LED-based disinfection device for the end of a secondary water supply network as described in claim 4, characterized in that: The radiator uses metal as a heat conductor for heat dissipation.

6. The UV-LED-based disinfection device for the end of a secondary water supply network as described in claim 1, characterized in that: It also includes a thermometer, which is located inside the housing and connected to the control terminal of the secondary water supply system.

7. The UV-LED-based disinfection device for the end of a secondary water supply network as described in claim 1, characterized in that: It also includes an irradiance monitor, the probe of which is located inside the housing and connected to the control terminal of the secondary water supply system.

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