Is pesticide sorption by constructed wetland sediments governed by water level and water dynamics?

Environmental Science and Pollution Research International
Céline GaullierNicole Baran

Abstract

Constructed wetlands (CWs) are used to reduce the pesticide inputs from tile drainage or run-off to surface water. Their effectiveness appears variable and remains to be better characterized and understood. The aim of this study was to assess the influences of two hydraulic parameters (i.e., dynamics and water level) on the sorption process occurring in CWs. Then, two solid/liquid ratios were studied (1/1 and 1/5) to mimic the water level variation in the field, and two agitation speeds were used (none and gentle agitation) to simulate different water dynamics (stagnation and flow pass, respectively). Sorption kinetics and isotherms were obtained for four pesticides with contrasting properties. The pesticide adsorption coefficients were classified as follows: boscalid (BSC) > cyproconazole (CYP) > isoproturon (IPU) ∼ dimethachlor (DMT) at any ratio or agitation, in agreement with their water solubilities and K ow values. The effect of the solid/liquid ratio was evidenced for all conditions. Indeed, the adsorption equilibrium time was reached more quickly for the 1/1 ratio (24-72 h) than for the 1/5 ratio (96-120 h). In addition, the adsorption coefficients (K fads) were larger for the 1/1 ratio (1.8-11.2 L kg-1) than for the 1/...Continue Reading

References

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Jun 21, 2013·Environmental Science and Pollution Research International·Romain ValléeMarc Benoit
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Dec 3, 2014·Environment International·Jan Vymazal, Tereza Březinová
Oct 10, 2015·Environmental Pollution·Romain ValléeMarc Benoît

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Citations

Mar 24, 2018·Environmental Science and Pollution Research International·Hélène Budzinski, Michel Couderchet
Jan 6, 2022·Archives of Environmental Contamination and Toxicology·Laura B McCallaRon S Tjeerdema

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