Ultraviolet (UV-C) disinfection for water treatment

Discover how the UV-C water purifier works

WATER TREATMENT AND ULTRAVIOLET (UV-C) SANITIZER

WHAT IS THE WATER DISINFECTION WITH ULTRAVIOLETS?

The sun emits invisible light, the ultraviolet light, having sterilizing effect. This natural phenomenon is reproduced inside reactor (irradiation chamber) in which water goes in and will be disinfected by UV radiation (learn more about how does the UV disinfection works).

WHICH KIND OF WATER CAN BE TREATED WITH THE UV TECHNOLOGY?

There is a wide range of applications for the water disinfection using the UV technology, BIO-UV Group offers solutions for both professionals and individuals. For instance, you can treat surface water, residual water, pool water, industrial process water, drinking water, etc…

Globally, as soon as you need to disinfect the water, the UV technology may be used.

 

HOW ULTRAVIOLET UV-C WATER TREATMENT WORKS?

THE DIFFERENT TYPES OF UV-RAYS

There are several categories of ultraviolet rays depending on their wavelengths measured in Nanometer (nm). The UV rays’ wavelengths start from 10nm (under it’s X-rays) to 400nm (beyond it’s visible radiation).

ultraviolet light spectrum

There are 3 main types of UV radiation and each one has specific phytochemical effects on the irradiated bodies:

  • UV-A (wavelength from 315 to 400nm): they are causing skin pigmentation
  • UV-B (from 285 to 315nm): allow the vitamin D synthesis
  • UV-C (from 200 to 280nm): penetrate the microorganisms’ DNA and destroy it

THE UV-C RAYS’ GERMICIDAL EFFECT

So, the UV disinfection technology deals with the UV-C rays use for their sterilizing effect. Indeed, UV-C radiation modify the chemical frame of the irradiated living microorganism.

If we observe the trending line of DNA’s absorption we can notice a significant peak at 254nm, UV-C rays penetrate the heart of the microorganism's DNA and disturb the metabolism of cells until they are totally destroyed. 

uv-c light effect on microorganism's DNA

The ultraviolet UV-C disinfection process is able to kill 99,9% of the microorganisms like virusesbacteriaalgaeyeastsmould...including Legionella and Cryptosporidium.

bacteria and virus that can be killed by uv disinfection

Furthermore, apart from the wavelength, the sterilizing effect will be also determined by the UV energy amount absorbed by the DNA:

  • Weak to average UV-energy amount absorbed: bacteriostatic effect, the microorganism will still live but cannot reproduce
  • High UV-energy amount absorbed: bactericidal effect, the microorganism will be destroyed

So that, the more UV-energy the DNA absorb, the more efficient the germicidal effect is.

THE EFFECTIVE UV DOSE

The effective UV dose, expressed in mJ/cm² (millijoules per square centimeter), refers to the necessary UV energy that the micro-organisms (bacteria, viruses, algae in suspension…) must absorb before being destroyed. When this UV dose is reached, the UV-C rays penetrate the micro-organisms’ DNA and eradicate 99,9% of them.

The UV dose is a result of an equation between:

  • the flow rate
  • the UV exposure time (depending on the device’s design)
  • the UV-C power emitted by the lamp

Other parameters must to be taking into account while calculating the UV dose and notably, the UV transmittance measured as a percentage. It is the UV rays ease to go through water; the easier they are going through, the higher the percentage is.

Thanks to our expertise, we are able to offer optimum UV disinfection solutions even with low UV transmittance. (Learn more about BIO-UV Group’s expertise)

Whate are the Benefits OF water UV sterilizer?

There are plenty of benefits using the UV technology to purify water. Easy to use and install, BIO-UV devices do not require complicated maintenance. You only need to replace the lamp every two years as the BIO-UV lamps have a very long lifetime (16 000 hours) but this operation is fast and really easy to do (check out our video tutorial). Therefore, this is a very cost-effective solution for long and mid-term.

Furthermore, the UV disinfection does not alter the physicochemical composition of the water. Which means that water going through the UV reactor goes out with the same physical and chemical composition than it has before going in. The process only disinfects by removing viruses, bacteria, microbes, etc.

While all other water disinfection technologies like chlorine, bleach, ozone, chlorine dioxide and other will alter the water. They may even create harmful by-products and residuals that threaten the health.

So, this is not the case for UV treatment but also, it does not change the smell neither the taste which results in extreme comfort while consuming the water or swimming.

Besides, the UV technology prevents from corrosive effects and harmful product use while warrantying an efficient and safe treatment.

Finally, the main advantages of disinfecting the water with UV are the following:

  • Easy to install, use and maintain
  • Do not alter the physicochemical composition of the water
  • Do not create byproducts neither residuals
  • Do not change the taste neither the smell of the water
  • No corrosive effects
  • No needs for carrying or manipulate harmful products
  • Cost efficient at medium and long term