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The UV lamps for water treatment consist of specialized low-pressure mercury-vapor lamps that produce ultraviolet radiation at 254 nm, or medium-pressure UV lamps that produce a polychromatic output from 200 nm to visible and infrared energy. The UV lamp never contacts the water; it is either housed in a quartz glass sleeve inside the water ...
A germicidal lamp (also known as disinfection lamp or sterilizer lamp) is an electric light that produces ultraviolet C (UVC) light. This short-wave ultraviolet light disrupts DNA base pairing , causing formation of pyrimidine dimers , and leads to the inactivation of bacteria , viruses , and protozoans .
In real-world applications of wastewater treatment, however, this term usually refers more specifically to a subset of such chemical processes that employ ozone (O 3), hydrogen peroxide (H 2 O 2) and UV light [2] or a combination of the few processes. [3]
These lamps emit ultraviolet light with two peaks in the UVC band at 253.7 nm and 185 nm due to the mercury within the lamp, as well as some visible light. From 85% to 90% of the UV produced by these lamps is at 253.7 nm, whereas only 5–10% is at 185 nm. [36] The fused quartz tube passes the 253.7 nm radiation but blocks the 185 nm wavelength.
It is a well-known fact that ozone, a very strong oxidant, is used in water treatment disinfection.. It shows an extensive range of applications; drinking water, wastewater, water disinfection, color removal, micropollutants, pulp & paper bleaching, process water, ballast water, cooling towers, beverage and water bottling, aquaculture, aquariums (zoos), cyanide regeneration, food/ produce ...
Today, wastewater engineers also work on the collection of clean water for drinking, chemically treating it, and using UV light to kill off micro-organisms. They also treat water pollution in wastewater (blackwater and greywater) so that this water may be made safe for use without endangering the population and environment around it.
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