Application Research Of UV LED In Sterilization And Disinfection-Water Purification

UV-LEDs, or ultraviolet light-emitting diodes, have become a practical technique for disinfecting water over the past ten years. The advantages of traditional mercury UV lamps over chemical UV water disinfection techniques are still there with UV-LEDs, but they also do away with some drawbacks.

The Sterilization Technology

Numerous applications of UV LED Sterilization technology can be found in daily life. For instance, it is utilized in food, medicine, water, and sewage systems. Chemicals, heat, UV radiation, and ozone are all frequently used UV LED Sterilization techniques.

Due to their simplicity, chemicals (such as chlorine, peroxidase, etc.) are frequently employed for UV LED Sterilization; however, they may have unfavorable effects, such as changing the target's quality. The disadvantage of using chlorine for UV LED Sterilization is the production of odorous and biohazardous chemicals.

Water cannot retain ultraviolet and has little impact on the ecosystem. Additionally, it does not result in bacterial antibiotic resistance. Thus, UV LED Sterilization, which has recently appeared in the spotlight as a chlorination alternative, effectively cleans without chemical compounds.

UV lamps, such as relatively low and moderate mercury-vapor lamps, are used in traditional UV sterilizing techniques. These are used in biological labs and medical facilities to disinfect work environments and equipment. Regarding the efficiency of UV absorption by DNA, UV lights emit UV at a specific wavelength, which very closely matches the peaks of the anti-microbial efficacy curve.

UV radiation with a frequency of 365 nm is categorized as UV-A (320-400 nm), and UV-A has less potential for damage than UV-C (100-280 nm). A UV-LED produces light with a wavelength of 365 nanometers, which is less harmful to human eyes and skin than a lamp with a 254-nanometer wavelength.

Additionally, because UV-LED is mercury-free, it has no negative effects on the environment or people. An environmentally aware sterilizer is a UV-LED. Mercury, which is harmful to the environment and human health, is present in mercury-vapor lamps.

UV sterilizers must be made to fit the shape of lamps, which are often huge and occupy a lot of room. Thus, without using hazardous materials, new UV LED Sterilization equipment with low energy consumption can be created in various shapes and sizes.

Comparison Of UV LED With Conventional LED; S

UV-LEDs are more resilient, smaller, and mercury-free than their conventional counterparts. They also last longer and achieve full power more quickly. These benefits, with almost immediate startup times and customizable wavelengths, provide UV-LED reactor designs with great design flexibility.

Despite these benefits, conventional UV-LED reactor applications have concentrated on smaller networks, which are ineffective for treating municipal water. Due to their modest size, which ranges from 1 to 4 mm, UV-LEDs can be positioned to emit radiation in various directions.

Compared to conventional UV lamps, these highly focused radiation patterns allow for more orientation options and hence, unique fission reactors. For UV water disinfection, UV-LEDs have shown to be at least as effective as reduced UV (LPUV) lamps over a broad spectrum of anti-microbial frequencies (e.g., 250–285 nm).

These variables are improving year after year. The widespread adoption of UV-LED proper sanitation technology has been constrained by high upfront costs, poor output power, and low facade efficiency.

As a result, the usage of the technology has primarily been limited to point-of-use, small-scale batch applications, where the shortcomings of the technology are overcome by prolonged exposure periods to achieve the necessary UV dose.

Nevertheless, the creation of the first full-scale UV-LED reactors that may be used at municipal water works (WTWs) has been made possible by the rapid advancements in UV-LED technology and the optimization of reactors' design and performance.

Such reactors are made of a crystal glass tube with UV-LEDs arranged in a series along the cylinder's edge, which allows UV light to enter the water flowing through the reactor. Thermal control is accomplished by dissipating the heat produced by the operating LEDs using a fluid circulation system surrounding the reactor vessel.

Biodosimetry

To determine if UV-LEDs can be used for large-scale UV water disinfection, a precise assessment of the UV water disinfection efficiency of full-scale reactors is required. Biodosimetry is the current validation method for conventional UV reactors (using mercury lamps)

In this context, the evaluation of a surrogate test microorganism's sensitivity to UV exposure over various doses with calibrated activation kinetics is called biodosimetry. The dose-response curve for UV reactors is typically determined through collimated beam testing using the test water's microorganism.

A reduced relative dose (RED) (mJ/cm2) is computed using the calibrated curve and the measured deactivation of the biodosimeter.

UV Dose-Response Curve For The Reactors

The challenged organism should be grown similarly from the same stock of microorganisms. A UV dose-response curve for the reactors is produced as a result of the operation, and it shows the reduction dosage for each log inactivation attained at full scale.

Additionally, the approach includes UV transmittance (UVT) in the UV dose calculation, standardizing the reactor's UV dose-response curves to various indicative water quality levels based purely on UVT.

Therefore, the primary goal of this work was to determine the UV-LED system's performance by utilizing substitute test microorganisms and comparing it to that of traditional UV lamps.

Cryptosporidium spp

chose Cryptosporidium spp. as our targeted organism since UV is frequently applied in situations with a greater probability of Cryptosporidium incidence. Risk factors for Cryptosporidium include their presence in source waters, resistance to chlorine (reported chlorine contact durations of 1000–10,000 mg min/L), and propensity to evade drinking filtered water due to their small size (4–6 m).

The inactivation UV treatment for Cryptosporidium parvum is 0.16 cm2/MJ, which is considerably less than the corresponding constant for free chlorine.

Where Can You Buy Your UV LED UV LED Sterilization From?

We surely have you covered if you are looking for reliable UV Led manufacturers. Zhuhai Tianhui Electronic Co., Ltd., one of the top UV LED producers, specializes in UV LED air decontamination, UV LED water UV LED Sterilization, UV Led printing systems and curing, uv led diode, uv led module, and other goods.

https://www.tianhui-led.com/sterilization-module.html

It has a skilled R&D and sales team to offer consumers UV LED Solutions, and its goods have also won the praise of many customers. With a complete production run, consistent quality and dependability, and affordable costs, Tianhui Electronics has been working in the UV LED package market.