Wastewater disinfection is an essential barrier against surface and source water contamination of pathogenic microorganisms. Despite some disadvantages, chemical disinfectants, especially chlorine, have been the methods of choice for decades. However, recent technological improvement
makes UV disinfection as an attractive alternative for chemical disinfectants (Wolfe, 1990). In fact, UV radiation has been shown to be very effective in inactivating pathogenic bacteria and viruses at relatively low doses (Sobsey, 1989). Furthermore, recent research using animal infectivity
assay indicated that UV radiation extensively inactivated a highly chlorine-resistant protozoan pathogen, Cryptosporidium parvum, at relatively low doses (Clancy et al, 1998). However, the previous study used a polychromatic medium-pressure UV radiation source while the majority of
wastewater treatment plants utilizing UV as a disinfection source employ monochromatic low-pressure UV radiation. Also, considering the sensitivity of protozoan parasites to UV disinfection and the practicability of their assay systems, a more practical model microorganism should be employed
as a treatment indicator to evaluate the performance of UV disinfection systems.
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