Impact of water matrix on the removal of micropollutants by advanced oxidation technologies

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

Authors

Ana Rita Ribeiro (Author) FEUP; Nuno F. F. Moreira (Author) Other; Gianluca Li Puma (Author) Other; Adrián M. T. Silva (Author) FEUP

Journal

Title: Chemical Engineering Journal

Vol. 363

Pages: 155-173

ISSN: 1385-8947

Publisher: Elsevier

Indexing

ISI Web of Knowledge - 10 Citations

Scopus - 158 Citations

Associated Projects

SAMPREP - Novas técnicas miniaturizadas de preparação de amostra para determinação de micropoluentes em matrizes ambientais

InSpeCt - Identifying and interrupting micropollutants of EU concern by using Smart Carbon materials

Other information

Authenticus ID: P-00Q-6TE

DOI: 10.1016/j.cej.2019.01.080

Abstract (EN): Micropollutants (MPs) in the aquatic compartments are originated from many sources and particularly from the effluents of urban wastewater treatment plants (UWWTPs). Advanced oxidation technologies (AOTs) usually applied after biological processes, have recently emerged as effective tertiary treatments for the removal of MPs, but the oxidation rates of the single compounds may be largely affected by the constituent species of the water matrix. These species include dissolved organic matter and inorganic species (e.g., carbonate, bicarbonate, nitrite, sulphate, chloride). This review analyses the impact of such substances on common AOTs including photolysis, UV/H2O2, Fenton, photocatalysis, and ozone-based processes. The degradation efficiency of single MPs by AOTs results from the combined impact of the water matrix constituents, which can have neutral, inhibiting or promoting effect, depending on the process and the mechanism by which these water components react. Organic species can be either inhibitors (by light attenuation; scavenging effects; or adsorption to catalyst) or promoters (by originating reactive oxygen species (ROS) which enhance indirect photolysis; or by regenerating the catalyst). Inorganic species can also be either inhibitors (by scavenging effects; formation of radicals less active than hydroxyl radicals; iron complexation; adsorption to catalyst or decrease of its effective surface area) or promoters (e.g., nitrate ions by formation of ROS; iron ions as additional source of catalyst). The available data reviewed here is limited and the role and mechanisms of individual water components are still not completely understood. Further studies are needed to elucidate the wide spectrum of reactions occurring in complex wastewaters and to increase the adoption of AOTs in UWWTPs.

Language: English

Type (Professor's evaluation): Scientific

No. of pages: 19