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Chávez AM, Rey A, Beltrán FJ, et al. Solar photo-ozonation: A novel treatment method for the degradation of water pollutants. J Hazard Mater. 2016;317:36-43doi: 10.1016/j.jhazmat.2016.05.050.
Chávez, A. M., Rey, A., Beltrán, F. J., & Álvarez, P. M. (2016). Solar photo-ozonation: A novel treatment method for the degradation of water pollutants. Journal of hazardous materials, 31736-43. https://doi.org/10.1016/j.jhazmat.2016.05.050
Chávez, Ana M, et al. "Solar photo-ozonation: A novel treatment method for the degradation of water pollutants." Journal of hazardous materials vol. 317 (2016): 36-43. doi: https://doi.org/10.1016/j.jhazmat.2016.05.050
Chávez AM, Rey A, Beltrán FJ, Álvarez PM. Solar photo-ozonation: A novel treatment method for the degradation of water pollutants. J Hazard Mater. 2016 Nov 05;317:36-43. doi: 10.1016/j.jhazmat.2016.05.050. Epub 2016 May 17. PMID: 27258212.
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J Hazard Mater. 2016 Nov 05;317:36-43. doi: 10.1016/j.jhazmat.2016.05.050. Epub 2016 May 17.

Solar photo-ozonation: A novel treatment method for the degradation of water pollutants.

Journal of hazardous materials

Ana M Chávez, Ana Rey, Fernando J Beltrán, Pedro M Álvarez

Affiliations

  1. Departamento de Ingeniería Química y Química Física, Universidad de Extremadura, Avenida de Elvas S/N, 06071 Badajoz, Spain.
  2. Departamento de Ingeniería Química y Química Física, Universidad de Extremadura, Avenida de Elvas S/N, 06071 Badajoz, Spain. Electronic address: [email protected].

PMID: 27258212 DOI: 10.1016/j.jhazmat.2016.05.050

Abstract

The decomposition of aqueous ozone by UV-vis radiation has been investigated with focus on the impact of ozone photolysis on the degradation of water pollutants during solar ozonation processes. The apparent first-order rate constants of the decomposition of ozone (kobs) have been determined at various pHs in the 4-9 range using radiation of different wavelengths in the UV-vis range. It was found that UVA-visible radiation (λ>320nm) highly enhanced ozone decomposition, especially at pH 4, for which kobs was three-folded with respect to the process in the absence of radiation. Hydrogen peroxide was identified as a main intermediate of ozone photo-decomposition at pH 4. Experiments of degradation of oxalic acid by ozone showed that solar irradiation brings about an increase in the hydroxyl radical to ozone exposures ratio (Rct). Finally, photo-ozonation (λ>300nm) was shown advantageous over single ozonation in the mineralization of a selection of emerging contaminants (metoprolol, ibuprofen, N,N-diethyl-meta-toluamide and clofibric acid) in both ultrapure water and a synthetic secondary effluent. Thus, TOC removal in 2-h treatments increased from 10 to 25% in the absence of radiation to about 50% in the presence of radiation.

Copyright © 2016 Elsevier B.V. All rights reserved.

Keywords: AOP; Emerging contaminants; Photo-ozonation; UVA-visible radiation; Water treatment

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