4.7 Article

Formation of nitrosamines during chloramination of two algae species in source water-Microcystis aeruginosa and Cyclotella meneghiniana

Journal

SCIENCE OF THE TOTAL ENVIRONMENT
Volume 798, Issue -, Pages -

Publisher

ELSEVIER
DOI: 10.1016/j.scitotenv.2021.149210

Keywords

Algae; Chloramination; Nitrosamines; Intracellular organic matter; Extracellular organic matter

Funding

  1. Natural Science Foundation of China [51678255, 51178117]
  2. Science and Technology Major Project of the Bureau of Science and Technology of Xiamen [3502Z20191012]
  3. Quanzhou City Sciences & Technology Program of China [2018C082R]

Ask authors/readers for more resources

The study investigated the contribution of two algae species, M. aeruginosa and C. meneghiniana, to the formation of nitrosamines during chloramination in drinking water treatment. Results showed that increasing reaction time and algae cell concentration enhanced the formation potential of different NAs, with IOM being the main source of NAs precursors for both algae species. EEM analysis confirmed that SMPs and protein-like substances were the main cellular components contributing to NAs formation for both algae.
The contribution of two algae species, Microcystis aeruginosa (M. aeruginosa) and Cyclotella meneghiniana (C. meneghiniana), to the formation of nitrosamines (NAs) during chloramination in drinking water treatment was investigated. A variety of factors including contact time, algae cell concentration, chloramine dosages, and algal cell components (cell debris (CD), intracellular organic matter (IOM), and extracellular organic matter (EOM)) were evaluated for influencing the formation of different NAs, such as N-Nitrosodiethylamine (NDMA), N-Nitrosomethylethylamine (NMEA), N-Nitrosodibutylamine (NDBA), N-Nitrosodi-n-propylamine (NDPA), and N-nitrosopyridine (NPyr). In addition, NAs formation from Chlorophyll-a and Microcystin-LR (MC-LR) after chloramination was studied. These results showed that the increase of reaction time and algae cell concentration enhanced the formation potential of five types of NAs from both algae species, except for the NDMA formation from C. meneghiniana, which increased first and then decreased with increased reaction time. The generation of NDMA was detected as the dominated type of NAs. The formation of total NAs from both algae species followed same pattern of increasing first and then decreasing with the increase of chloramine dosage. The largest NAs formation potential (NAsFP) of M. aeruginosa and C. meneghiniana showed at 1.5 mM and 1.0 mM monochloramine, respectively. Moreover, the impacts of algae cellular components on the formation potential of NAs followed the order of IOM > EOM >> CD and IOM >> CD > EOM for M. aeruginosa and C. meneghiniana, respectively, indicating that IOM was the main source of NAs precursors for both algae. Furthermore, EEM analysis before and after chloramination confirmed that the soluble microbial products (SMPs) and protein-like substances were the main cellular components that contributed to NAs formation for both algae. The NAs formation potential of Microcystin-LR was much higher than that of Chlorophyll-a chloramination. (c) 2021 Published by Elsevier B.V.

Authors

I am an author on this paper
Click your name to claim this paper and add it to your profile.

Reviews

Primary Rating

4.7
Not enough ratings

Secondary Ratings

Novelty
-
Significance
-
Scientific rigor
-
Rate this paper

Recommended

No Data Available
No Data Available