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The influence of light exposure, water quality and vegetation on the removal of sulfonamides and tetracyclines: A laboratory-scale study

The effect of aquatic vegetation (Spyrogira sp. and Zannichellia palustris), light exposure and water quality (secondary-treated wastewater vs. ultrapure water) on the removal efficiency of six antibiotics (sulfonamides and tetracyclines) is studied in laboratory-scale reactors. After 20d of treatment, 3-59% of sulfonamides were eliminated in the reactors exposed to light. Removal was about 10% in unplanted reactors in darkness. The elimination of tetracycline (TC) and oxytetracycline (OTC) ranged between 83% and 97% in both planted and unplanted reactors. However, in dark unplanted reactors, OTC was largely removed (88%) while only 15% of TC was eliminated. These results suggest that TC was mainly removed by photodegradation whereas biodegradation or hydrolysis process seems to be significant processes for OTC. Sulfonamides were mainly eliminated by biodegradation or indirect photodegradation processes. Pseudo-first order kinetics removal rates ranged from 0.003 and 0.007d-1 for Sulfamethazine and TC in the covered control reactors to 0.13 and 0.21d-1 for TC and OTC in the uncovered control reactors, with half-lives from 3 to 350d. A TC photodegradation product was tentatively identified in uncovered reactors. This study highlights the important role played by light exposure in the elimination of antibiotics in polishing ponds

This study has been financed by the Spanish Ministry of Science and Innovation, project CTM2011-28765-C02-02. AG acknowledges a BR2011/27 research grant from the University of Girona

© Chemosphere, 2013, vol. 90, núm. 8, p. 2297-2302

Elsevier

Author: Garcia-Rodríguez, Aida
Matamoros, Víctor
Fontàs Rigau, Clàudia
Salvadó Martín, Victòria
Date: 2013
Abstract: The effect of aquatic vegetation (Spyrogira sp. and Zannichellia palustris), light exposure and water quality (secondary-treated wastewater vs. ultrapure water) on the removal efficiency of six antibiotics (sulfonamides and tetracyclines) is studied in laboratory-scale reactors. After 20d of treatment, 3-59% of sulfonamides were eliminated in the reactors exposed to light. Removal was about 10% in unplanted reactors in darkness. The elimination of tetracycline (TC) and oxytetracycline (OTC) ranged between 83% and 97% in both planted and unplanted reactors. However, in dark unplanted reactors, OTC was largely removed (88%) while only 15% of TC was eliminated. These results suggest that TC was mainly removed by photodegradation whereas biodegradation or hydrolysis process seems to be significant processes for OTC. Sulfonamides were mainly eliminated by biodegradation or indirect photodegradation processes. Pseudo-first order kinetics removal rates ranged from 0.003 and 0.007d-1 for Sulfamethazine and TC in the covered control reactors to 0.13 and 0.21d-1 for TC and OTC in the uncovered control reactors, with half-lives from 3 to 350d. A TC photodegradation product was tentatively identified in uncovered reactors. This study highlights the important role played by light exposure in the elimination of antibiotics in polishing ponds
This study has been financed by the Spanish Ministry of Science and Innovation, project CTM2011-28765-C02-02. AG acknowledges a BR2011/27 research grant from the University of Girona
Format: application/pdf
ISSN: 0045-6535
Document access: http://hdl.handle.net/10256/11536
Language: eng
Publisher: Elsevier
Collection: MICINN/PN 2012-2012/CTM2011-28765-C02-02
Reproducció digital del document publicat a: http://dx.doi.org/10.1016/j.chemosphere.2012.09.092
Articles publicats (D-Q)
Is part of: © Chemosphere, 2013, vol. 90, núm. 8, p. 2297-2302
Rights: Tots els drets reservats
Subject: Aigües residuals -- Eliminació
Sewage disposal
Contaminants emergents en l’aigua
Emerging contaminants in water
Title: The influence of light exposure, water quality and vegetation on the removal of sulfonamides and tetracyclines: A laboratory-scale study
Type: info:eu-repo/semantics/article
Repository: DUGiDocs

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