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AWWA WQTC65941
- Using Formation Potential Tests to Elucidate the Reactivity of DBP Precursors with Chlorine versus with Chloramines
- Conference Proceeding by American Water Works Association, 11/01/2007
- Publisher: AWWA
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Two pathways have been suggested to account for nitrile [HAN, CNCl] formation duringchlorine or chloramine disinfection. The first pathway, the "decarboxylation pathway", has beenstudied by numerous researchers. A second pathway, the "aldehyde pathway",is based on a reaction between monochloramine and aldehydes to form the corresponding nitrile.As part of a study on nitrogenous (N) disinfection byproducts (DBPs), two halogenated disinfection byproduct formation potential (DBPFP) tests were conducted inraw and treated waters: one in the presence of chlorine; and, the other in the presence ofchloramines. The latter formation potential (FP) test was also used for the evaluation of NDMA precursors.Moreover, a third FP test was developed, with pre-chlorination and post-chloramination, in orderto measure cyanogen halide (CNX) precursors. Objectives of this study included identificationof N-DBP precursors in source waters, the formation and control of N-DBPs, and theirmechanism of formation. Includes 29 references, figures.
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