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Title: Novel pre-treatments to control bromate formation during ozonation
Authors: Antoniou, Maria G. 
Sichel, Cosima 
Andre, Klaus 
Andersen, Henrik Rasmus 
Keywords: Ammonia;Atrazine;Bromate;Chlorine dioxide;Ozone;Permanganate
Category: Earth and Related Environmental Sciences
Field: Natural Sciences
Issue Date: 5-Feb-2017
Source: Journal of Hazardous Materials,5 February 2017, Volume 323, Pages 452-459
Abstract: Worldwide water shortage increase and water quality depletion from microbial and chemical compounds, pose significant challenges for today's water treatment industry. Both the development of new advanced oxidation technologies, but also the enhancement of existing conventional technologies is of high interest. This study tested improvements to conventional ozonation that reduce the formation of the oxidation-by-product bromate, while maintaining the effectiveness for removal emerging contaminants (atrazine). MnO4−, ClO2−, ClO2, ClO−, CH3COOO−, HSO5− or S2O8−2 with NH4+ were tested as pre-treatments to ozonation of ground water. Each oxidant and NH4+ were added in a single stage or separately prior to ozonation. To the best of our knowledge, this is the first study that has tested all the above-mentioned oxidants for the same water matrix. Based on our results, the most promising pre-treatments were MnO4− − NH4+, ClO2− − NH4+ and ClO2 − NH4+. MnO4− − NH4+ was the only pre-treatment that did not inhibit atrazine removal. When compared with the previously proposed Cl2/NH4+ pre-treatment, MnO4− + NH4+ was found as effective for preventing BrO3− formation, while atrazine removal was higher. In addition, MnO4− + NH4+ can be added in a single stage (compared to the 2 stage addition of Cl2/NH4+) without causing the formation of potentially harmful chlorination-by-products.
ISSN: 03043894
DOI: 10.1016/j.jhazmat.2016.03.041
Rights: © 2016 Elsevier B.V.
Type: Article
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