Wastewater disinfection is challenged by particles in the wastewater effluent that may protect pathogens from lethal doses of disinfectants. Ultraviolet (UV) light and chlorine are two disinfectants that are common for use in wastewater. Typically, one or the other disinfectant is utilized.
Over the ranges of disinfection doses applied for wastewater, UV disinfection can inactivate non-particle associated coliform efficiently. However, when UV is applied in wastewater with appreciable amounts of particle associated coliform, complete inactivation is unattainable. Chlorine added
to wastewater was found to more effectively inactivate particle associated coliform under doses that achieved the CT using long (>45 minutes) contact times. However, equivalent CT doses using shorter contact times (higher concentrations of chlorine) were not as efficacious against particle
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