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A portable, battery-powered, low-pressure mercury-vapour discharge lamp for water sterilization Cutaway model of UV disinfection unit used in water treatment plants. Ultraviolet disinfection of water is a purely physical, chemical-free process.
A semi-permeable membrane filters out contaminants such as bacteria, viruses, heavy metals, nitrates, chlorides, sulfates, disinfection by-products, aromatic hydrocarbons, and pesticides. NEWater is thus free from viruses and bacteria and contains very low levels of salts and organic matter. At this stage, the water is of potable quality.
[29] [30] Studies have shown that UV doses at the levels provided by common portable UV units are effective at killing Giardia [31] and that there was no evidence of repair and reactivation of the cysts. [32] Water treated with UV still has the microbes present in the water, only with their means for reproduction turned "off".
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Ultraviolet light (UV) is very effective at inactivating cysts, in low turbidity water. UV light's disinfection effectiveness decreases as turbidity increases, a result of the absorption, scattering, and shadowing caused by the suspended solids. The main disadvantage to the use of UV radiation is that, like ozone treatment, it leaves no ...
WASHINGTON (Reuters) -The U.S. budget deficit jumped nearly four-fold to $257 billion in October, a figure inflated by one-off factors, the Treasury Department said on Wednesday in a report that ...
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