Formation of NDMA and Halogenated DBPs by Chloramination of Tertiary Amines: The Influence of Bromide IonReport as inadecuate




Formation of NDMA and Halogenated DBPs by Chloramination of Tertiary Amines: The Influence of Bromide Ion - Download this document for free, or read online. Document in PDF available to download.

1 LEESU - Laboratoire Eau Environnement et Systèmes Urbains 2 LCME - Laboratoire de Chimie et Microbiologie de l-Eau

Abstract : The formation of NDMA and other DBPs including THMs, HANs, HKs has been investigated by chloramination of several tertiary amines in the absence and in the presence of bromide ion. NDMA formation from the most reactive tertiary amines e.g. dimethylaminomethylfurfuryl alcohol or DMP30 was enhanced in the presence of bromide due to the formation of brominated oxidant species such as bromochloramine NHBrCl and the hypothetical UDMH-Br as an intermediate. The formation of NDMA by chloramination of less reactive model compounds was inhibited in the presence of bromide. This can be explained by competitive reactions leading to the production of brominated DBPs i.e. THMs. In the presence of bromide, the formation of brominated THMs during chloramination can be attributed to the presence of small amounts of HOBr produced by the decomposition of chloramines and bromamines. The results are of particular interest to understand NDMA formation mechanisms, especially during chloramination of wastewaters impacted by anthropogenic tertiary amines and containing bromide ion.

Keywords : NDMA Nitrosamine Chloramination Disinfection By-products THM Bromide





Author: Julien Le Roux - Hervé Gallard - Jean-Philippe Croué -

Source: https://hal.archives-ouvertes.fr/



DOWNLOAD PDF




Related documents