Knowing facts for effective water treatment

In this section we want to give you a brief introduction to Ultraviolet radiation.

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At what intervals are the lamps to be exchanged?

We recommend a lamp change every 12 to 15 months after start of operation. Even if at that time the UV-C-intensity is still about 85%, it subsequently declines rapidly.


Source: Philips TUV low pressure mercury lamps

Which factors must be taken into account?

1. The intensity of radiation (E), that is the dosage of radiation which is influenced by multiple criteria (i.e. type of lamp, distance). The rate is mostly indicated as W/m².

2. The time of radiation (t).

Thus the dosage is defined as UV intensity x time (H = E x t).

Another essential factor are the physical quality of the water. Depending on the composition of minerals it has a higher or lower absorptive power. This power is defined with an absorption coefficient (example: Water has an absorption coefficient of 0,02 to 0,1). The absorption of fresh or salt water is quite higher and depends on additives and the degree of pollution.


What is the source of ultraviolet light?

The best known energy source of ultraviolet light is the sun.  However, by the time the UV light reaches the earth it has been reduced to minimal intensities by such factors as the atmospheric conditions, latitude, and time of the day. Artificial UV light in the germicidal spectrum have been developed for production of UV radiation, e.g. UV-C sterilizer lamps. 

UV light (energy) is produced by a low pressure mercury lamp made from a glass formula which permits the passage of light rays of a specific wave length.

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