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UPC: C/ Jordi Girona 31, (08034 - Barcelona) - IDAEA: C/ Jordi Girona 18-26, (08034 - Barcelona)

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The Effect of Redox Conditions in Ultraviolet-Filter’s Fate and the Influence of Biomass in Sorption Processes 

SEMINARIO GRUPO DE HIDROLOGIA SUBTERRÁNEA (UPC-CSIC)
 
 
A cargo de: Paula Rodriguez Escales (Personal Docent Investigador UPC)
 
Dia: Jueves 07 de Marzo
Hora: 12:15 h
 
Lugar: Departamento de Ingeniería Civil y Ambiental, Modulo D2-Aula CIHS, Planta Baja

 

Abstract:
Ultraviolet (UV) filters are one of the most common compounds found in water systems. They are widely used as personal and care products like sunscreens and cosmetics (perfumes, creams or shampoos), and in a number of industrial applications. Aside from degradation, sorption determines the concentration of UV-filters in the water bodies and thus their bioavailability and toxicity to ecosystems and humans. UV-filters are a wide group of compounds, with different sorption behavior expected depending on the chemical properties (pKa, Koc, Kow). Combining with the changes of sorbent properties, it makes necessary the improvement of the understanding of sorption processes of UV-filters occurring in the aquifer. Thus, the goal of this work was to evaluate the role of biomass growth, solid organic matter (SOM) and redox conditions in sorption processes of a set of UV-filters with different chemical properties. To achieve this goal, we have constructed a conceptual and a numerical model to evaluate the fate of selected UV filters, mainly focused on sorption processes but also addressing degradation. The models were validated with published data by Liu et al. (2013), consisting in different batch experiments evaluating the fate of a cocktail of UVs under different redox conditions. The compounds evaluated included ionic UV filters (Benzophenone-3; 2-(3-t-butyl-2-hydroxy-5-methylphenyl)5-chloro benzotriazole; 2-(2’-hydroxy-5’-octylphenyl)-benzotriazole) and neutral ones (octyl 4-methoxycinnamatte; and octocrylene). 

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