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Emerging organic contaminants in wastewater: Understanding electrochemical reactors for triclosan and its by-products degradation.
Magro, Cátia; Mateus, Eduardo P; Paz-Garcia, Juan M; Ribeiro, Alexandra B.
Afiliação
  • Magro C; CENSE, Department of Sciences and Environmental Engineering, NOVA School of Science and Technology, NOVA University Lisbon, Caparica Campus, 2829-516, Caparica, Portugal. Electronic address: c.magro@campus.fct.unl.pt.
  • Mateus EP; CENSE, Department of Sciences and Environmental Engineering, NOVA School of Science and Technology, NOVA University Lisbon, Caparica Campus, 2829-516, Caparica, Portugal.
  • Paz-Garcia JM; Department of Chemical Engineering, Faculty of Sciences, University of Malaga, Teatinos Campus, 29010, Málaga, Spain.
  • Ribeiro AB; CENSE, Department of Sciences and Environmental Engineering, NOVA School of Science and Technology, NOVA University Lisbon, Caparica Campus, 2829-516, Caparica, Portugal. Electronic address: abr@fct.unl.pt.
Chemosphere ; 247: 125758, 2020 May.
Article em En | MEDLINE | ID: mdl-31931309
ABSTRACT
Degradation technologies applied to emerging organic contaminants from human activities are one of the major water challenges in the contamination legacy. Triclosan is an emerging contaminant, commonly used as antibacterial agent in personal care products. Triclosan is stable, lipophilic and it is proved to have ecotoxicologic effects in organics. This induces great concern since its elimination in wastewater treatment plants is not efficient and its by-products (e.g. methyl-triclosan, 2,4-dichlorophenol or 2,4,6-trichlorophenol) are even more hazardous to several environmental compartments. This work provides understanding of two different electrochemical reactors for the degradation of triclosan and its derivative by-products in effluent. A batch reactor and a flow reactor (mimicking a secondary settling tank in a wastewater treatment plant) were tested with two different working anodes Ti/MMO and Nb/BDD. The degradation efficiency and kinetics were evaluated to find the best combination of current density, electrodes and set-up design. For both reactors the best electrode combination was achieved with Ti/MMO as anode. The batch reactor at 7 mA/cm2 during 4 h attained degradation rates below the detection limit for triclosan and 2,4,6-trichlorophenol and, 94% and 43% for 2,4-dichlorophenol and methyl triclosan, respectively. The flow reactor obtained, in approximately 1 h, degradation efficiencies between 41% and 87% for the four contaminants. This study suggests an alternative technology for emerging organic contaminants degradation, since the combination of a low current density with the flow and matrix induced disturbance increases and speeds up the compounds' elimination in a real environmental matrix.
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Texto completo: 1 Base de dados: MEDLINE Assunto principal: Compostos Orgânicos / Triclosan / Poluentes Químicos da Água / Técnicas Eletroquímicas / Águas Residuárias Limite: Humans Idioma: En Ano de publicação: 2020 Tipo de documento: Article

Texto completo: 1 Base de dados: MEDLINE Assunto principal: Compostos Orgânicos / Triclosan / Poluentes Químicos da Água / Técnicas Eletroquímicas / Águas Residuárias Limite: Humans Idioma: En Ano de publicação: 2020 Tipo de documento: Article