Dynamique des flux de fondants routiers et influence sur la pollution routière au sein d’un bassin de rétention-décantation

Abstract : In severe winter conditions, the application of deicer salts (mainly sodium chloride -NaCl) ensures the safety of network users. However, its spreading carries contamination risks of aquatic and terrestrial ecosystems. On the road, Na+ and Cl- are transported by runoff water to retention-decantation ponds. These ponds do not have the capacity to efficiently treat this flux of deicer salts in dissolved form. In addition, they allow the modification of water and soil chemistry, generating the mobility of metallic pollutants. The objective of this thesis is to study the deicer salt transfer and to determine its role in the release of pollutants during winter. The characteristics of the pond located in Azerailles (Lorraine, France) on a medium-frequented national road were studied, as well as the weather and salting conditions, the composition of the suspended matters and the concentration of traces metals. The results highlighted that between 50 and 90 % of Cl- was collected by the pond. The pond acts as a buffer which allows a release of the collected Cl- diluted during the runoff period following the salting period. The presence of NaCl in runoff water reduced the quality of suspended solids with the presence of organic markers of road pollution and the increase of zinc. It also influenced the increase of zinc in water, the chemical composition and the speciation of elements.
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Lucie Barbier. Dynamique des flux de fondants routiers et influence sur la pollution routière au sein d’un bassin de rétention-décantation. Génie des procédés. Université de Lorraine, 2019. Français. ⟨NNT : 2019LORR0031⟩. ⟨tel-02141697⟩

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