The process of killing a large portion of microorganisms in or on a substance, but not bacterial spores. The primary of disinfection in water and wastewater treatment is to kill or render harmless microbiological organisms that cause disease. At the present time Chlorination is the most important disinfection option for drinking water treatment for the foreseeable future; however, other viable disinfection processes include Ozonation and Ultraviolet Radiation (UV).

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