Removing color and chloroform precursors from low turbidity waters by direct filtration

Abstract

Direct filtration was evaluated by using synthetic waters with raw color of 55 and 110 Pt‐Co units and Raquette River water with raw water color ranging from 40 to 70 Pt‐Co units and turbidities of 0.68–1.4 ntu. A cationic polyelectrolyte was used; dosages for direct filtration were selected from jar tests. Excellent filtration performance was achieved for color and turbidity. CHCI, precursor reduction was evaluated from CHCI3 formation potential data for raw waters and filter effluent samples. Precursor reductions were 50–60 percent for the synthetic waters and approximately 40 percent for the Raquette River water.