Biotransformation of Nitrosamines and Secondary Amines in a Mixed Methanogenic Culture
Abstract:A mixed, methanogenic culture, developed with inoculum obtained from a mesophilic (35°C), municipal anaerobic digester was amended with six nitrosamines, N-nitrosodimethylamine (NDMA), N-nitrosomethylethylamine (NMEA), N-nitrosopyrrolidine (NPYR), Nnitrosodiethylamine (NDEA), N-nitrosodi-n-propylamine (NDPA), and N-nitrosodi-nbutylamine (NDBA), and their corresponding secondary amine precursors. During the batch assay, NDMA, NMEA, and NPYR were degraded by 70 – 100 %. However, the observed decrease in the NDEA, NDPA and NDBA concentration was statistically insignificant. The biotransformation rates of the secondary amines were greater than those of the corresponding nitrosamines, and the lower molecular weight compounds showed a higher biotransformation potential. Nitrosamine biodegradation was found to be the result of cometabolism. Moreover, the nitrosamine biotransformation pathway may involve reduction of the nitroso group and subsequent N-N cleavage, leading to the formation of secondary amines which are highly biodegradable under anaerobic conditions. The results of this study can contribute significantly to the development of new strategies for nitrosamine removal during municipal wastewater treatment.
Document Type: Research Article
Publication date: 2009-01-01
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