Effect of Monochloramine and Dimethylamine Concentrations on the NDMA Formation

ABSTRACT : As a disinfection byproduct, N -nitrosodimethylamine(NDMA) formation was studied according to chlorine, nitrogen, and carbon composition related to monochloramine and dimethylamine(DMA) concentrations. The highest NDMA formation was observed whenthe dimethylamine/monochloramine ratio was close to 1, and the formation was rapidly decreased when the ratio was less or greater than 1. The formation of NDMA increased with increasing chlorine/nitrogen ratio indicating the chlorine is a limiting factor. A rapid dis-infection byproduct was formed at 72 hour contact time in this study. As the previous researches, pH was a significant factor for the NDMA formation. Key Words : Disinfection Byproduct, Dimethylamine(DMA), Monochloramine, N-nitrosodimethylamine(NDMA), Water Supply System 요약: }¢ yýA¹—
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