UV light emitted at certain wavelengths (eg. 254 nm) is able to kill specific bacteria present in water – the UV rays effectively act as a disinfection treatment. This is known as UV germicidal treatment.
In order to ensure that the UV light from a UV lamp actually exposes the bacteria found within the water, it needs to be protected by a transparent Quartz glass “sleeve”. The job of the Quartz sleeve is to give strength and protection to the UV lamp while still allowing maximum UV transmission. The sleeves are generally able to be cleaned and/or changed on a regular basis to ensure maximum transmission efficiency of the UV light.
Typically, UV germicidal treatment units are used in waste water treatment plants, swimming pools, for ballast water on ships, in food & drink production, pharmaceutical plants, aquaculture, ponds, and a number of other related areas.
The general principle is to suck “dirty” water in to a UV germicidal treatment unit, expose it to the UV lamp, and let the “clean” water flow out of the unit. The number of UV lamps within a treatment unit will depend on the rate at which the water is flowing, and how dirty the water is.