AWWA QTC97141

The term "enhanced coagulation" is used when doses of coagulant are higher than needed for turbidity or particle removal. Enhanced coagulation has been identified by the US Environmental Protection Agency as the best available technology for disinfection byproduct (DBP) precursor removal. The authors believe that EPA's approach to enhanced coagulation, which involves adding large coagulant doses at ambient pH, is not operationally sound or cost effective for most situations. The study evaluated an alternative coagulation protocol--optimized coagulation--which involves the optimization of the pH of coagulation before optimization of the coagulant dose. The study evaluated combinations of three coagulants (alum, ferric chloride and polyaluminum chloride) using optimized coagulation for 18 different waters from sites with varying total organic carbon and alkalinity levels to determine the impact on settled water quality and microbial removal.

Product Details

Published:

01/01/1997

ISBN(s):

0898679583

Number of Pages:

20

File Size:

1 file , 500 KB