Using ultraviolet germicidal irradiation (UVGI) to purify water
Traditional municipal water treatment facilities in the United States rely on filtration, sedimentation, aeration, and chlorination to make water clean enough to deliver to customers. While this does an outstanding job under normal circumstances, the increasing prevalence of antibiotic-resistant microorganisms and the omnipresent threat of bioterrorism have spurred the development of ultraviolet germicidal irradiation (UVGI).
Scientists have long known that UV light can harm, or even kill, certain microorganisms. UVGI furthers this by ridding water, air and other surfaces of harmful microorganisms such as viruses & bacteria. It does so by emitting certain wavelengths of ultraviolet light (UVB & UVC) in a controlled manner within a range between 200 and 320 nanometers via low-pressure mercury lamps. Known as the germicidal range, this wavelength has proven to be effective at enabling the UV light to damage the cells or DNA of the targeted microorganism, thereby eradicating it or rendering it unable to replicate.
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