The newly built Tampa Bay Regional Water Treatment Plant consists of USFilter's patented process called ACTIFLO (ballasted flocculation), ozonation followed by biologically active filtration and chloramination for secondary disinfection. Several alternatives were considered for ozone dissolution: fine bubble diffusion contactors, in-line injectors and static mixers. After a thorough qualitative and quantitative evaluation of the various alternatives, static mixers were selected for ozone dissolution. This paper will discuss the "science" that influenced the selection of the ozonation process along with the pilot study results that led to the construction of the largest, state-of-the-art plant in the US incorporating static mixers for ozone dissolution.
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