UV light is a continuous spectrum of light from the sun. UV radiation is further divided into four sub-categories according to the radiation wavelength: UV-A, UV-B, UV-C and UV-Vacuum.
The DNA of living beings is most sensitive to UV-C radiation among the UV light wavelengths. Living organisms do not have adequate defence mechanisms against ultraviolet rays, having always being protected from the ozonosphere.
The photochemical reaction resulting from exposure to UV-C light involves breaking the bonds in the DNA chain by preventing micro-organisms from reproducing, making them complete their life cycle without generating future generations. The peak of maximum DNA sensitivity is a wavelength at 260nm, which is why UV-C lamps are highly efficient at low pressure, generating a monochrome emission at 254nm.
The UV-C disinfection systems exploits the effects of this radiation on DNA; its helical chain is interrupted, preventing the replication of the genetic code and thus largely preventing the possibility of forming bacterial colonies: the microorganism is then disabled, preventing reproduction.
The sizing of UV treatment systems is therefore focused on the intensity produced inside a completed reaction volume, and on the contact time in which the micro-organisms are exposed to radiation.
In a few seconds the fluid to be treated is simply irradiated and the bacterial load disabled, without the use of chemical products, without altering the organoleptic characteristics of the water and without generating any unpleasant by-products which could be dangerous for humans and the environment.
This system is undoubtedly eco-compatible, and can also be used for some “difficult” fluids (for example emulsified oils, glucose syrups and industrial waste), thanks to irradiation structures specially designed for optimal performance.