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

• Type: Article in International Scientific Journal
• Date: 2019

Authors

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

Journal

Title: Catalysts

Vol. 9 No. 5

Pages: 1-16

ISSN: 2073-4344

Publisher: MDPI

Indexing

ISI Web of Knowledge - 0 Citations

Scopus - 12 Citations

INSPEC

Other information

Authenticus ID: 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.

Language: English

Type (Professor's evaluation): Scientific

No. of pages: 16