Journal
WATER RESEARCH
Volume 62, Issue -, Pages 220-228Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.watres.2014.05.051
Keywords
Hydrated electron; UV/sulfite; Reductive dehalogenation; Kinetic modeling; Efficiency
Funding
- National Natural Science Foundation of China [21307057, 51108117]
- Natural Science Foundation of Jiangsu Province [BK20130577, BK2012017]
- Specialized Research Fund for the Doctoral Program of Higher Education of China (SRFDP) [20130091120014]
- Fundamental Research Funds for the Central Universities [20620140128, HEUCFZ1124]
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Hydrated electron (e(aq)(-)), which is listed among the most reactive reducing species, has great potential for removal and detoxification of recalcitrant contaminants. Here we provided quantitative insight into the availability and conversion of e(aq)(-) in a newly developed sulfite/UV process. Using monochloroacetic acid as a simple e(aq)(-)-probe, the e(aq)(-)-induced dehalogenation kinetics in synthetic and surface water was well predicted by the developed models. The models interpreted the complex roles of pH and S(IV), and also revealed the positive effects of UV intensity and temperature quantitatively. Impacts of humic acid, ferrous ion, carbonate/bicarbonate, and surface water matrix were also examined. Despite the retardation of dehalogenation by electron scavengers, the process was effective even in surface water. Efficiency of the process was discussed, and the optimization approaches were proposed. This study is believed to better understand the e(aq)(-)-induced dehalogenation by the sulfite/UV process in a quantitative manner, which is very important for its potential application in water treatment. (C) 2014 Elsevier Ltd. All rights reserved.
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