Types Of Air Purifier For Bacteria and Viruses
In the case of bacteria and viruses, you want to kill them rather than just collect them. There are three effective ways of destroying bacteria and viruses within an air purifier:
- Ultra-violet germicidal irradiation
- Photocatalytic Oxidation
Let’s take a look at these one by one.
Ultra-Violet Germicidal Irradiation
This is basically a sterilization method using ultra-violet light. The UV light has to be at the right wavelength of which the most effective is 254 nanometers. At this
wavelength the UV irradiation breaks the molecular bonds within DNA of microorganisms like viruses and bacteria. This destroys them or renders them harmless. It also destroys fungal spores and mold spores.
The air is heated up to 400 degrees Fahrenheit or 250 degrees Centigrade within a sterilization chamber and the high temperature kills the microorganisms.
As described above in the gaseous pollutants section, UV light shining on a titanium dioxide catalyst creates highly reactive oxidants which oxidise the microorganisms.
Types Of Air Purifier For Particulate Matter
For particulate matter like dust, dust mites, mold spores, pollen and pet dander, there are four main types of air purifier:
- HEPA filter