What is the effective wavelength of UV lights for water treatment?

The effective wavelength of UV lights for water treatment is 254 nanometers. This wavelength is particularly effective because it falls within the range that is absorbed by the DNA of microorganisms, including bacteria and viruses. When UV light at this wavelength is used, it disrupts the DNA structure of these pathogens, rendering them inactive and thereby preventing them from causing infection or disease.

The choice of 254 nanometers is widely adopted in water disinfection practices. UV systems are designed to emit light at this particular wavelength because extensive research has shown that it is optimal for maximizing germicidal effectiveness. This wavelength is also a standard in many commercial UV water treatment systems, highlighting its importance in the industry.

Other wavelengths, while they may have applications or show effectiveness in different contexts, do not offer the same level of germicidal efficacy as 254 nanometers when it comes to water disinfection.