Removal of organic micropollutants from a municipal wastewater secondary effluent by UVA-LED photocatalytic ozonation

• Tipo: Artigo em Revista Científica Internacional
• Data: 2019

Autores

Ana M. Chávez (Autor) Outra; Ana Rita Ribeiro (Autor) FEUP; Nuno F. F. Moreira (Autor) Outra; Adrián M. T. Silva (Autor) FEUP; Ana Rey (Autor) Outra; Pedro M. Álvarez (Autor) Outra; Fernando J. Beltrán (Autor) Outra

Revista

Título: Catalysts

Vol. 9 Nº 5

Páginas: 1-16

ISSN: 2073-4344

Editora: MDPI

Indexação

ISI Web of Knowledge - 0 Citações

Scopus - 12 Citações

INSPEC

Outras Informações

ID Authenticus: P-00Q-NTE

DOI: 10.3390/catal9050472

Abstract (EN): Numerous contaminants of emerging concern (CECs) have been found in different water bodies. Directive 2013/39/EU and Decision 2018/840/EU are consequently being implemented in the field of water policies. Twelve CECs (e.g., isoproturon, ciprofloxacin, and clarithromycin are among those listed) were detected in a municipal wastewater secondary effluent by means of solid phase extraction and ultra-high-performance liquid chromatography with tandem mass spectrometry (SPE-UHPLC-MS/MS). Different advanced oxidation processes (AOPs), based on the combination of ozone, UVA-LED and powdered TiO2, were investigated for their removal in a semi-batch operation. In addition, TiO2-coated glass rings (P25R) were characterized with different techniques (SEM, WDXRF) and used for continuous mode operation in a packed bed reactor (PBR). Among the AOPs studied, ozone-based processes were found to be more efficient than heterogeneous photocatalysis. A kinetic study was performed showing that direct ozonation is the main oxidation pathway for CEC removal. Ozone was successfully decomposed in combination with UVA-LED and P25R, resulting in an apparent rate constant of 3.2 × 10¿2 s¿1 higher than in the O3 /LED system (1.0 × 10¿3 s¿1) or with ozone alone (8.6 × 10¿5 s¿1). Hydroxyl radical reaction could prevail over direct ozone reaction for the most refractory compounds (e.g., isoproturon). © 2019 by the authors. Licensee MDPI, Basel, Switzerland.

Idioma: Inglês

Tipo (Avaliação Docente): Científica

Nº de páginas: 16