The use of UV Light as a means of water disinfection has been a proven process for many years. The method is widely recognised by federal and state regulatory agencies. UV irradiation is rapidly becoming a preferred alternative to chlorinating. The majority of the lamps being used today
is of the low pressure mercury type. However, although less efficient in UV generation, the high power density of medium pressure lamps turn it into logical alternative for high capacity water treatment systems. This paper reviews the basic characteristics of today's low and medium
pressure UV lamps, together with two promising novelties: “pulsed white light” and “dielectric barrier discharge” lamps.
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