What is UV radiation?
UV rays are high energetic, electromagnetic rays, occurring in the natural spectrum of the sun.
For UV disinfection the bactericidal UVC range (200 - 280 nm) is used and here the specific wavelength of 254 nm. The absorption maximum of microorganisms lies at this wave length, from which results the germicidal effect.
In addition, the UV radiation can also be used to reduce TOC (total organic carbon). The energy-rich UVC radiation is made use of in the wave length range of between 200 – 280 nm and, contrary to disinfection, also of the VUV (vacuum UV) in the interval of 100 – 200 nm.
In several fields of industry, ozone is increasingly being used for disinfection and cold sanitisation purposes of ultrapure water storage and distribution systems. Before using the water in processes, the ozone has to be destroyed. In this case the destruction of residual ozone by UV is the ideal process. However, only lamps with a wavelength of 254 nm were used.