期刊
JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY
卷 324, 期 -, 页码 145-151出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jphotochem.2016.03.028
关键词
Bromoform; E. coli inactivation; TiO2-UVA; Trihalomethane
资金
- Research Grant Council of Hong Kong SAR Government [GRF 476811, 14100115]
- National Natural Science Foundation of China [20877024]
- NIFA/USDA [SC-1700489, 2014-67019-21615]
- CAS/SAFE-A International Partnership Program for Creative Research Teams of Chinese Academy of Sciences, China
- Division Of Earth Sciences
- Directorate For Geosciences [1529927, 1530375] Funding Source: National Science Foundation
- NIFA [687822, 2014-67019-21615] Funding Source: Federal RePORTER
The high effectiveness of TiO2-UVA system in bacterial disinfection has gained attention to use this technology in water treatment on different source waters, including desalinated sea water and grey water. However, source waters containing a significant level of bromide could have different chemical pathways during TiO2-UVA disinfection process because reactive bromine species could be formed. To illustrate the water safety from the Br-TiO2-UVA system, this study investigated bacterial inactivation efficiency and disinfection byproduct (DBP) formation under different pH, TiO2 dosages and bromide concentrations in a laboratory setting. At a high bromide concentration (65 mg/L, equivalent to the concentration of natural sea water), the bacterial inactivation rate increased 2 times at pH 5 and more than 5 times at pH 8. However, a significant increase of brominated DBPs, which were considered more carcinogenic and toxic than chlorinated DBPs, was observed. The bacterial inactivation pattern was shifted from the shoulder-log to the log-tail under different bromide concentrations, suggesting the existence of bromide altered the bacterial inactivation mechanisms. We also observed that the inactivation kinetics of Br-TiO2-UVA system was greatly influenced by water pH. Our laboratory experiments demonstrated that bromide could improve the performance of photocatalytic inactivation, but it also could reduce the water safety by generating a higher level of brominated-DBPs in treated water. Water engineers should pay attention to the brominated DBP formation when applying TiO2-UVA photocatalysis on source waters with a significant level of bromide. (C) 2016 Elsevier B.V. All rights reserved.
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