Impact of Water Quality and Pretreatment upon UV Inactivation of MS-2 Bacteriophage in Combined Sewer Overflow

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The disinfection of MS-2 bacteriophage by low pressure and medium pressure UV was evaluated in three different source waters: raw wastewater, storm water runoff and a synthetic combined sewer overflow prepared from a 50:50 mix of raw wastewater and storm water runoff. Each of the source waters were pretreated by dissolved air floatation and vortex separation prior to UV exposure. Source water and pretreated samples underwent UV disinfection in a series of bench scale trials utilizing a low and medium pressure collimated beam apparatus. MS-2 dose-response curves of each water type were compared within each UV technology to determine the impact of pretreatment and role of suspended solids upon UV disinfection performance.

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