Ozone (1) A chemical compound composed of three oxygen atoms used in water disinfection. (2) A blue gaseous allotrope of oxygen (triatomic oxygen), O3, formed naturally from diatomic oxygen by electric discharge or exposure to ultraviolet radiation. It is an unstable, powerfully bleaching, poisonous oxidizing agent with a pungent, irritating odor, used to deodorize air, purify water, treat industrial wastes, and as a bleach. Increasingly, public utilities are converting from chlorine to ozone as a primary disinfectant. More potent than chlorine, ozone is the only known water supply disinfectant that is effective against the water-borne pathogen Cryptosporidium. In addition, ozone does not create health-threatening byproducts such as trihalomethanes (THMs) and haloacetic acids that are created in chlorination.
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Author of the Water Words Dictionary source of text: Gary A. Horton
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