Dissolved Air Flotation (DAF) Pilot Study for Algae and DBP Reduction

Originally published in the NEWWA Journal, April 2015

A pilot study of dissolved air flotation clarification (DAF) with mixed media filtration was conducted at the Norwich Public Utilities Stony Brook water treatment plant for the removal of disinfection byproducts (DBP) and algae in the late summer of 2013.  A variety of coagulants and flow rates were studied. DAF showed outstanding algae removal in excess of 90 percent with all coagulants. DBP removal varied by coagulant with ferric chloride and high doses of alum achieving the best results.

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