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- Title
Bromide Enhanced the Formation and Transformation of Halonitromethanes from Diatom Solution in the UV/NH<sub>2</sub>Cl Disinfection Process.
- Authors
Mao, Yuyang; Wang, Tao; Deng, Lin; Fu, Shuang; Hu, Jun; Singh, Rajendra Prasad
- Abstract
Halonitromethanes (HNMs) are typical nitrogenous disinfection by-products (N-DBPs) with stronger toxicity compared to the regulated haloacetic acids and trihalomethanes, and bromide (Br−) significantly influences HNMs’ formation and transformation. Herein, Br− influencing the formation and transformation of HNMs from diatom solution were investigated during UV/monochloramine (UV/NH2Cl) disinfection. Results indicated that the diatom’s intracellular organic matter (IOM) solution produced more HNMs than the extracellular organic matter (EOM) solution. The concentrations of HNMs produced from IOM increased initially and then decreased with time during UV/NH2Cl disinfection. Besides, the main species of HNMs produced from IOM were changed from chlorinated HNMs to chlorinated (brominated) HNMs or brominated HNMs with increasing Br− concentration. Furthermore, the concentrations of HNMs produced from IOM were significantly enhanced with increasing Br− concentration from 0 to 10 μM or diatom concentration from 0.65 × 108 to 2.6 × 108 cells L−1, but declined with increasing pH value from 6.0 to 8.0. Then, the possible formation and transformation pathways of HNMs from IOM were deduced in the presence of Br−. Finally, it could be observed that HNMs formation in natural waters was broadly similar to that in simulated waters. This work will contribute to elucidating HNMs formation in algae-containing waters during UV/NH2Cl disinfection in the presence of Br−.
- Publication
Water, Air & Soil Pollution, 2024, Vol 235, Issue 6, p1
- ISSN
0049-6979
- Publication type
Article
- DOI
10.1007/s11270-024-07231-0