N-Nitrosamine Formation upon Chloramination and Chlorination of Cyanobacterial Strains

dc.contributor.authorPu, Changcheng
dc.contributor.authorZeng, Teng
dc.descriptionThis report was prepared for the New York State Water Resources Institute (NYSWRI) with support from the U.S. Geological Survey under Grant/ Cooperative Agreement No. G21AP10626-01en_US
dc.description.abstractBlooms of blue-green algae (cyanobacteria) cause many water quality management issues. Water utilities oftentimes need to treat source waters laden with various cyanobacterial populations, which may contribute to the formation of harmful disinfection byproducts (DBPs), such as N-nitrosamines, in downstream drinking water treatment. This preliminary study investigated the formation of total and specific N-nitrosamines upon chloramination and chlorination of laboratory cultures of cyanobacteria. Two Microcystis aeruginosa strains (one confirmed microcystin producer and one non-toxin producing strain) were cultivated and harvested at different growth phases. Chloramination of cyanobacterial samples revealed that the toxin producing strain produced more N-nitrosamine precursors per dry cell weight than the non-toxin producing strain, and that the production of N-nitrosamine precursors from cyanobacteria was growth phase-dependent. Filtration of cyanobacterial samples through 0.7-μm glass fiber filters removed over 90% of N-nitrosodimethylamine (NDMA) and N-nitrosopyrrolidine (NPYR) precursors, which predominantly existed in the dissolved and/or colloidal phases. In contrast, filtration only removed around 50% of total N-nitrosamine (TONO) precursors, highlighting the importance of unknown precursors associated with cyanobacterial cells. Chlorination of cyanobacterial samples at varying chlorine doses led to enhanced TONO formation at and beyond the breakpoint, although the toxin producing strain released a significant amount of ammonium. The addition of ammonium chloride to non-toxin producing, low-ammonium cyanobacterial samples prior to chlorination did not result in statistically significant increases in TONO formation, suggesting that organic chloramines may play a role in the absence of in situ formation of inorganic chloramines during chlorination. Preliminary characterization of cyanobacterial samples using fluorescence spectroscopy and high resolution mass spectrometry revealed differences in optical and molecular properties of cyanobacterial organic matter derived at exponential and stationary growth phases.en_US
dc.publisherNew York State Water Resources Instituteen_US
dc.rightsAttribution-NonCommercial 4.0 International*
dc.subjectSyracuse Universityen_US
dc.subjectHarmful Algal Bloomsen_US
dc.subjectWater Supplyen_US
dc.titleN-Nitrosamine Formation upon Chloramination and Chlorination of Cyanobacterial Strainsen_US


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