ULTRAVIOLET RADIATION

As we had seen previously, ultraviolet radiation , which comes from the sun, is very dangerous to alive beings because it produces considerable damages genetic. Luckily, and as we had explained previously, the layer of ozone absorbs until 99% of this radiation preventing the effect to surface of the Earth.

But, what is exactly ultraviolet radiation ? Radiation UV is a light form, it has much power than the visible light, so it has a wavelength smaller (400 to 150 nanometers) than visible one.

Based on the wavelength we will be able to distinguish three types of radiation UV:

• UV A. - This radiation is from 320 to 400 nm. She is nearest the visible phantom and it is not absorbed by ozone.

• UV-B. - It is from 280 to 320. The ozone layer absorbs it almost completely. It is very harmful causing alterations in DNA.

• UV-C. - It has smaller wavelength of 280 nm. This type of radiation is extremely dangerous and harmful because of his power, but it is completely absorbed by ozone and oxygen.

This harmful effect can be used for disinfection and elimination of alive organisms in a lot of situations and of course, in all type of water treatment in which we have biological content. A lamp that radiates 254 UV-C nm is demonstrated that produces the highest field of disinfection.

When ultraviolet light affects to DNA chain in alive beings, it causes a union of several nucleotides adjacent, and so it destroys this chain and produces the death or inactivation of the organisms.

The treatment by means of ultraviolet radiation is therefore a very effective alternative to water purification , water treatment of swimming pools or disinfection of sanitary waters or high biological load water.

If we joined the effective effect harmful disinfectant of ultraviolet light with the powerful one to be able to oxidize that has the ozone , we will obtain a synergic effect due to photolytic reactions, which acquire an enormous capacity disinfectant.