AWWA WQTC69438

Previously, it was thought that using ultraviolet (UV) disinfection for 4-log virus inactivation would be cost prohibitive due to the high doses required in the Long Term 2 Enhanced Surface Water Treatment Rule (LT2ESWTR). However, recent studies (Linden, 2007) have shown that the dose necessary for 4-log adenovirus inactivation is approximately 40% to 50% lower than the doses published in the LT2ESWTR when polychromatic UV lamps are used (Linden et al 2007). A recent validation using adenovirus2 demonstrated this in full scale. This study evaluated the costs (i.e., capital, and operation and maintenance costs) and sustainability of using chlorine or UV disinfection for virus inactivation of groundwater and surface waters. The results of this study show that UV disinfection is a cost effective option for select disinfection scenarios. UV disinfection was also shown to have environmental and risk benefits when compared to traditional chemical disinfection. Includes 9 references, tables.