How is UV water treatment done? (process)

1 answer

The 01/04/2022

The principle of ultraviolet water treatment is simple: it involves passing the water, after filtration, through a reactor containing one (or more) UV lamps to disinfect the water.

How it works ?

There are 3 categories of UV rays (depending on the wavelength):
UV-A (400-315nm): immediate tanning of the skin
UV-B (315-280nm): synthesis of vitamin D
UV-C (280-100nm): germicidal effect

The optimum germicidal effect of UV-C is reached at 254nm, so this is the wavelength that will be used for water disinfection.

At 254nm, UV-C rays penetrate the DNA of microorganisms and completely neutralize it.

Note that disinfection efficiency also depends on the flow to be treated, the salinity of the water and also the time of exposure to UV-C.

These factors must therefore be taken into account when designing the device.

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Posted on : Tuesday 3 January 2023