UV light for disinfection

How does UV light work? UV light is well-documented as an effective method of disinfection. It is possible to neutralize most microorganisms such as bacteria, fungi, yeast, and viruses.

UV light operation

UVC treatment is an effective form of disinfection in air, liquids, and on surfaces. When the UVC light hits microorganisms and penetrate their cells, the DNA in the cells is destroyed and prevents the cells from reproducing. By preventing the cells from reproduing, the UVC light prevents the cells from turning into an infection in a host.

The best wavelength to ensure maximum disinfection effectiveness is 264 nm.

 

Works in all conditions.

UVC irradiation of microorganisms is successful regardless of pH, temperature, or whether they are in solid, liquid, or airborne form. The important thing is that the radiation can reach the organism. If a bacterium is hidden from the light, it can also avoid the radiation. Unlike other disinfection methods, however, there are very rarely end products in the event of over- or under- irradiation with UVC light.

The UV light can be used as the sole disinfection solution, but also works very well as a supplement to other techniques.

Our UV systems can be installed in all types of environments and are used in a wide range of applications in both industry and agriculture.

 

We are happy to help

If you have disinfection needs, but have not found the solution yet, call us at tel. +45 22 680 680 or write us

We are always ready to make a custom solution tailored to your exact needs and wishes.

 

Bacteria, viruses, and fungi

Here you will find a selection of the dose needed to neutralize the organisms mentioned by 90-99,99%.

Microorganism UV light dose in J/m2 to achieve 90% reduction Microorganism UV light dose in J/m2 to achieve 90% reduction
Bacillus anthracis – Anthrax 45.2 Vibrio comma – Cholera 33.75
Clostridium tetani 130.0 Mucor racemosus A 170.0
Corynebacterium diphtheriae 33.7 Penicillium roqueforti 130.0
Ebertelia typhosa 21.4 Chlorella Vulgaris 130.0
Escherichia coli 30.0 Paramecium 110.0
Listeria Monocytes 45,0 Bacteriophage – E. Coli 26.0
MRSA 32.0 Infectious Hepatitis 58.0
Mycobacterium tuberculosis 62.0 Influenza 34.0
Pseudomonas aeruginosa 55.0 Brewers yeast 33.0
Pseudomonas fluorescens 35.0 Common yeast cake 60.0
Salmonella enteritidis 40.0 Saccharomyces spores 80.0
Salmonella typhimurium 80.0 Streptococcus viridans 20.0

 

Inactivating microorganisms with UV light is an exponential process. The higher the UV light exposure (dose), the higher the proportion of microorganisms that can be inactivated, i.e.:
UV-light exposure (dose) required to inactivate 99% is twice the value for inactivating 90%.
UV-light exposure (dose) required to inactivate 99,9% is 3 times the value for inactivating 90%.
UV-light exposure (dose) required to inactivate 99,99% is 4 times the value for inactivating 90%.

Contact us to find the dose for exactly what you need.

 

Ultraviolet lighting

UV radiation is a types of electro-magnetic radiation. Other well-known types are X-ray, light, radio, and television radiation. The only difference between these types of electromagnetic radiation is the length of the radio waves. The shortest wavelength belongs to cosmic and X-ray radiation. Very long wavelengtha are associated with changing signals. Optical radiation is a very small spectrum. One of them is UV radiation. Visible and infrared radiation are examples of long wavelengths in this spectrum.

Ultraviolet is the part of electromagnetic radiation delimited by the shorter wavelengths within visible spectrum and the upper end of X-rays. The spectrum of ultraviolet radiation is between 100 and 400 nm and is invisible to the human eye.

 

Using the CIE classification, UV spectrum is divided into three types:

  • UVA (longwave radiation) from 315 nm to 400 nm
  • UVB (medium wave radiation) from 280 nm to 315 nm
  • UVC (shortwave radiation) from 100 nm to 280 nm

Short-wavelength UVC radiation has strong bactericidal effects. The UV radiation from a source is expressed in watts (W), and the irradiation density is expressed in watts per square meter (W/m²). To ensure bactericidal effects, the dose is important. Dose is irradiation density multiplied by time (t) in seconds and expressed in joules per square meter (J/m²). 1 joule is equivalent to 1 watt-second.

 

Why use UVC as a disinfectant?

UVC radiation is an effective way to disinfect water, air, and surfaces without adding or creating toxic effects. It is a natural agent, and the sun’s radiation is an important factor in keeping the environment clean. The dose and effectiveness of artificial UVC radiation is high relative to the sun’s radiation, but it ensures an environmentally friendly solution for disinfection needs.

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