Pesticide degradation in biochar use as filters to improve water quality in agricultural ditches
2025
Maurisse, Adrian | Laboratoire d'étude des Interactions Sol - Agrosystème - Hydrosystème (UMR LISAH) ; Institut de Recherche pour le Développement (IRD)-AgroParisTech-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE)-Institut Agro Montpellier ; Institut national d'enseignement supérieur pour l'agriculture, l'alimentation et l'environnement (Institut Agro)-Institut national d'enseignement supérieur pour l'agriculture, l'alimentation et l'environnement (Institut Agro) | Défi Clé Water Occitanie | Université de Montpellier | Dollinger Jeanne | Samouelian Anatja
Английский. Pesticide non-point source pollution threatens the health of water bodies. Mitigation measures are implemented to lower the dispersal risk. Among these, the use of biochar filters in agricultural ditches seems promising due to enhanced retention by sorption. However, the long-term efficiency of biochar filters relies on the degradation of the sorbed pesticides. Knowledge of pesticide degradation on biochar-amended soils is still scarce and the degradation of pesticides in biochar filters has never been investigated. In this work, we investigated the degradation kinetic of two pesticides, Metalaxyl-M and Napropamide on biochars aged in Mediterranean ditches and a compared it with a ditch soil. Three biochars from different feedstocks were aged for 18 months in two ditches characterized by contrasted microclimates. The ditch from la Jasse (Hérault, France) was frequently flooded and the ditch from Pech Rouge (Aude, France) remained dry and had higher temperatures. The degradation kinetics were measured in the lab at 20°C for incubation times from 1 to 120 days. The physico-chemical properties were acquired and the presence of biofilms was qualitatively assessed by scanning electron microscopy. We found that biochars characteristics were impacted by the microclimate conditions and biofilms were formed only on biochars from la Jasse. Accordingly, the degradation of Metalaxyl-M was faster for biochars from la Jasse (63
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