AWWA QTC97064

In most drinking water treatment plants, chlorine is added at several points including before sedimentation. Chlorination prior to sedimentation is termed prechlorination and is typically used to achieve disinfection (CT) credit, oxidize iron and manganese, control taste and odor and minimize biological growth in sedimentation basins. In light of the proposed maximum contaminant levels (MCLs) for total trihalomethanes (TTHMs) and the sum of five haloacetic acids (HAA5), utilities may need to reevaluate their prechlorination practices with respect to disinfection byproduct (DBP) and enhanced coagulation requirements. The objective of this study was to investigate the impact of the point of chlorination on DBP formation and control through coagulation, flocculation and sedimentation for a representative range of waters and treatment conditions.

Product Details

Published:

01/01/1997

ISBN(s):

0898679583

Number of Pages:

19

File Size:

1 file , 450 KB