Commenced in January 2007
Frequency: Monthly
Edition: International
Paper Count: 30135
Degradation of Amitriptyline Hydrochloride, Methyl Salicylate and 2-Phenoxyethanol in Water Systems by the Combination UV/Cl2

Authors: F. Javier Benitez, Francisco J. Real, Juan Luis Acero, Francisco Casas

Abstract:

Three emerging contaminants (amitriptyline hydrochloride, methyl salicylate and 2-phenoxyethanol) frequently found in waste-waters were selected to be individually degraded in ultra-pure water by the combined advanced oxidation process constituted by UV radiation and chlorine. The influence of pH, initial chlorine concentration and nature of the contaminants was firstly explored. The trend for the reactivity of the selected compounds was deduced: amitriptyline hydrochloride > methyl salicylate > 2-phenoxyethanol. A later kinetic study was carried out and focused on the specific evaluation of the first-order rate constants and the determination of the partial contribution to the global reaction of the direct photochemical pathway and the radical pathway. A comparison between the rate constant values among photochemical experiments without and with the presence of Cl2 reveals a clear increase in the oxidation efficiency of the combined process with respect to the photochemical reaction alone. In a second stage, the simultaneous oxidation of mixtures of the selected contaminants in several types of water (ultrapure water, surface water from a reservoir, and two secondary effluents) was also performed by the same combination UV/Cl2 under more realistic operating conditions. The efficiency of this combined system UV/Cl2 was compared to other oxidants such as the UV/S2O82- and UV/H2O2 AOPs. Results confirmed that the UV/Cl2 system provides higher elimination efficiencies among the AOPs tested.

Keywords: Emerging contaminants, amitriptyline, methyl salicylate, 2-phenoxyethanol, chlorination, photolysis, rate constants, UV/chlorine advanced oxidation process.

Digital Object Identifier (DOI): doi.org/10.5281/zenodo.1126195

Procedia APA BibTeX Chicago EndNote Harvard JSON MLA RIS XML ISO 690 PDF Downloads 1017

References:


[1] D. J. Lapworth, N. Baran, M. E. Stuart R. S. Ward, Emerging organic contaminants in groundwater: a review of sources, fate and occurrence. environ Pollut 163 (2012) 287-303.
[2] K. Ikehata, M. G. El-Din, S. A. Snyder, Ozonation and advanced oxidation treatment of emerging organic pollutants in water and wastewater. Ozone: Science and Engineering 30 (2008) 21-26.
[3] C. Sichel, C. Garcia, K. Andre, Feasibility studies: UV/chlorine advanced oxidation treatment for the removal of emerging contaminants. Water Research 45 (2011) 6371-6380.
[4] L.S. Clesceri, A. E. Greenberg, R. R. Trussell, Standard methods for the examination of water and wastewater, 17th ed., APHA, AWWA, WPCF, Washington DC (1989).
[5] J. Jin, M. G. El-Din, J.R. Bolton, Assesment of the UV/chlorine process as an advanced oxidation process. Water Research 45 (2011), 1890-1896.