Effects of macrophyte species and biochar on the performance of treatment wetlands for the removal of glyphosate from agricultural runoff.

Autor: Boucher-Carrier O; Institut de Recherche en Biologie Végétale, Département de Sciences Biologiques, Université de Montréal, 4101 Sherbrooke East, QC, H1X 2B2 Montréal, Québec, Canada., Brisson J; Institut de Recherche en Biologie Végétale, Département de Sciences Biologiques, Université de Montréal, 4101 Sherbrooke East, QC, H1X 2B2 Montréal, Québec, Canada., Abas K; Institut de Recherche en Biologie Végétale, Département de Sciences Biologiques, Université de Montréal, 4101 Sherbrooke East, QC, H1X 2B2 Montréal, Québec, Canada., Duy SV; Département de Chimie, Université de Montréal, Complexe des sciences, 1375 Avenue Thérèse-Lavoie-Roux, H2V 0B3 Montréal, Québec, Canada., Sauvé S; Département de Chimie, Université de Montréal, Complexe des sciences, 1375 Avenue Thérèse-Lavoie-Roux, H2V 0B3 Montréal, Québec, Canada., Kõiv-Vainik M; Institut de Recherche en Biologie Végétale, Département de Sciences Biologiques, Université de Montréal, 4101 Sherbrooke East, QC, H1X 2B2 Montréal, Québec, Canada; Department of Geography, Institute of Ecology and Earth Sciences, University of Tartu, 46 Vanemuise St., 51003 Tartu, Estonia. Electronic address: margit.koiv.vainik@ut.ee.
Jazyk: angličtina
Zdroj: The Science of the total environment [Sci Total Environ] 2022 Sep 10; Vol. 838 (Pt 2), pp. 156061. Date of Electronic Publication: 2022 May 20.
DOI: 10.1016/j.scitotenv.2022.156061
Abstrakt: Glyphosate is the most widely used herbicide in the world, and consequently has polluted numerous water bodies through agricultural runoff. Treatment wetlands (TWs) have shown great promise for mitigating such pesticide contamination. The objectives of our study were to determine the effects of adding biochar to subsurface flow TW substrate, and to evaluate the performance of three North American macrophyte species (Phragmites australis subsp. americanus, Scirpus cyperinus and Sporobolus michauxianus) for removal of glyphosate. A synthetic agricultural runoff comprising 50 μg/L of glyphosate was applied to water-saturated TW mesocosms with mature vegetation during a 5.5-week period. Average removal efficiency, calculated on a mass balance basis, reached 78 and 82% for mesocosms with biochar (without and with plants, respectively), and 54 to 76% for those with macrophytes. Sporobolus michauxianus showed a lower evapotranspiration rate and less anoxic conditions in the lower part of the substrate, which resulted in lower overall removal performance. Aminomethylphosphonic acid (AMPA), the main toxic metabolite of glyphosate, was detected in all mesocosms, but at higher levels in planted ones. Results show that both the sorption capacity of biochar and the biodegradation processes associated with macrophytes contribute to glyphosate removal in TWs. Additionally, our results suggest that species selection is important to enhance favorable conditions and maximize removal of targeted pollutants.
Competing Interests: Declaration of competing interest The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.
(Copyright © 2022 Elsevier B.V. All rights reserved.)
Databáze: MEDLINE
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