UV disinfection reactors are an effective and economic means to inactivate oocysts of the protozoan parasite Cryptosporidium in drinking water. Cryptosporidiosis outbreaks can occur as a result of filter breakthrough following increased oocyst loading of treatment processes (Bouchier, 1998). Oocysts are resistant to commonly used chlorine-based disinfectants and therefore filter failure can result in outbreaks of cryptosporidiosis (Korich et al., 1990). Low and medium pressure UV disinfection has been demonstrated to be effective at reducing oocyst infectivity at economic UV doses, and hence UV reactors have become increasingly common as drinking water treatments for inactivating oocysts and other waterborne pathogens
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