Issue 3, 2023

GC-HRMS analysis to evaluate the effectiveness of ozone disinfection in the removal of micropollutants from wastewater

Abstract

The objective of this study was to apply targeted and untargeted screening analyses to perform a deep assessment of micropollutant removal during wastewater disinfection by ozonation. To perform this study, effluents from two wastewater treatment plants (WWTPs) were treated with ozone at different doses and analyzed using gas chromatography coupled with Orbitrap High-Resolution Mass Spectrometry. The removal of different chemical families was assessed in relation to the level of Escherichia coli and the total removal of coliforms. The micropollutant removal rates at the typical ozone dose for disinfection (7.6 mg O3 per L) followed the order alkylphenols > pharmaceuticals and personal care products > organophosphorus flame retardants > phthalates > biomolecules. Micropollutant removal during ozone disinfection depended on their initial concentration and the physiochemical characteristics of the secondary effluent. Although bacterial inactivation in mixed gray water (GW) was observed at a dose of 15.2 mg O3 per L, most contaminants were recalcitrant to degradation by ozone and were present in the treated effluent at concentrations ranging from 10 to 1450 ng L−1; however, these effluents were not toxic to Daphnia magna. The methodology proposed in this study is intended to provide a new protocol for the careful evaluation of ozonized WWTP effluents for disposal and reuse.

Graphical abstract: GC-HRMS analysis to evaluate the effectiveness of ozone disinfection in the removal of micropollutants from wastewater

Supplementary files

Article information

Article type
Paper
Submitted
18 Nov. 2022
Accepted
16 Janv. 2023
First published
17 Janv. 2023

Environ. Sci.: Water Res. Technol., 2023,9, 922-934

GC-HRMS analysis to evaluate the effectiveness of ozone disinfection in the removal of micropollutants from wastewater

R. O. Barbacena, J. Cristale, C. Barata, S. Lacorte and R. F. Dantas, Environ. Sci.: Water Res. Technol., 2023, 9, 922 DOI: 10.1039/D2EW00879C

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