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Sous-produits de dégradation d'herbicides dans le milieu naturel et sur les filières de traitement des eaux : quelles origines, quels impacts et quelles solutions ?

Abstract : Abstract : Brittany (France) is an agricultural region, where emerging pollutants are highly at risk to reach surface waters. Legal monitoring shows that herbicides metabolites are the main pollution of surface waters, in a region where 80 % of drinking water is produced with surface waters. The environmental behavior of herbicides metabolites is badly known and, for some of them, the contributions of their different sources are still debated. In east Britany, the Vilaine watershed (10 500 km²) is of great research interest, as a large drinking water treatment plant (100 000 m3/day) is located at the extreme downstream of it. In this context, this study aims to (i) map the watershed, (ii) evaluate the contamination and its spatial and seasonal variations, (iii) understand the favoring conditions resulting in metabolites export towards surface water, (iv) study sources and fate of AMPA (aminomethylphosphonic acid) in wastewaters, (v) explore ozonation treatment of a resistant metabolite in drinking water This thesis consists of three chapters: a review of the literature on herbicides and their metabolites occurrence and fate in surface waters, wastewaters, and drinking water; the materials and methods including, selection of compounds of interest, sampling strategy, description of the methods of analysis and quality assurance, statistical tools; the results of herbicides metabolites occurrences and behavior in the different waters studied. This work concludes on a broader context by providing perspectives to gain a better understanding of the sources and the factors influencing herbicides metabolites occurrences in the different waters, in order to improve the quality of water resources.
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Submitted on : Monday, January 27, 2020 - 6:35:27 PM
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Alexis Grandcoin. Sous-produits de dégradation d'herbicides dans le milieu naturel et sur les filières de traitement des eaux : quelles origines, quels impacts et quelles solutions ?. Santé. Université Rennes 1, 2019. Français. ⟨NNT : 2019REN1B022⟩. ⟨tel-02457139⟩

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