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AWWA RSP64382
- Chloramination versus Chlorination: Which Forms More Nitrogenous DBP?
- Conference Proceeding by American Water Works Association, 03/01/2007
- Publisher: AWWA
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This slide presentation outlines a study on the formation of nitrogenous disinfection byproducts by either chloramination or chlorination. It begins with background information on the advantages and disadvantages of chloramination versus chlorination, outlines the experimental methodology, and gives the results that include: chloramination forms, on average, ten times lower chloroformconcentrations, but five times higher DCAN concentrations,compared against free chlorine addition;DCAN and TCNM formations increase as the DOC to DON ratiodecreases upon free chlorine addition; colloidal natural organic matter (NOM) isolates, and other nitrogen enriched isolates,exhibited higher NDMA formation compared with hydrophobicacid isolates; NDMA formation increases as the amino-sugar toaromatic ratio of NOM increases;NDMA did not form upon free chlorine addition in NOM isolatesolutions; Nitrogen moieties of DOM and monochloramine both playimportant roles in NDMA formation;chloramination could form higher nitrogenous DBPs in drinkingwater systems over chlorination; and,DON can serve as a precursor material for nitrogenous DBPs. Includes figures.
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