| Title | Environmental availability of some trace metals in dredged sediments disposed on-land before use in fired brick processing |
|---|---|
| ID_Doc | 12474 |
| Authors | Lecomte, T; Baraud, F; Poree, S; Leleyter, L |
| Title | Environmental availability of some trace metals in dredged sediments disposed on-land before use in fired brick processing |
| Year | 2024 |
| Published | |
| Abstract | Regular dredging of sediments is necessary to ensure the proper functioning of naval and river infrastructures. In a context of generalised scarcity of raw materials for construction products, the recovery of sediments can, in a circular economy approach, constitute a sustainable solution for local operators. In order to ensure the environmental suitability of the construction products elaborated from sediments, it is necessary to analyse the availability of the contaminants. The aim of this study is to analyse the fate of Cd, Cr, Cu, Ni, Pb and Zn present in a dredged sediment during its ageing while awaiting its reuse in brick manufacturing. Single (EDTA, HCl, H2O) and sequential extractions are performed in order to assess the environmental availability of the elements studied. Various environmental indicators (EF, AEI, RAC) allow to estimate the potential risks associated. After 16 months, for most of the elements studied, the availability is almost twice its initial level, mainly due to the enrichment of the oxidizable fraction. The various indicators calculated show a slight decrease in the potential risk of Cd and Zn over time for surface samples and an increase for depth samples. The environmental availability and associated risks may increase immediately after the dredging operations, then tend to return to their original levels near the surface, while remaining quite high in depth. This suggests that attention must be paid on the deposition time and depth at which the sediments are taken from disposal sites when used for construction products. |
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