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Assessing the toxicity of virgin aggregates leachate versus dredged sediments leachate in backfill application
Archive ouverte : Communication dans un congrès
Edité par HAL CCSD
International audience. The replacement of virgin aggregates has been embedded into several environmental strategies around the world. The high demand for these materials leads to several substitutions with different materials from various sectors. Waste valorization is one of these alternatives. However, the use of such material has several environmental restrictions due to the fact of containing a few distinct pollutants (Ex: As, Ba, Cd, Cr, Cu, Hg, Pb, Zn...). These pollutants can lead to toxicity impacts on humans and freshwater. In France, non-submersible dredged sediments have been used in different applications (backfill, concrete, and others). As a consequence of being contaminated with heavy metals and other pollutants, sediments usage as backfill is constricted by certain environmental requirements (SETRA, 2011). This paper aims to assess the toxicity beyond using dredged sediments in backfill application as an alternative material for virgin aggregates. Comparing both material leachate effects on freshwater ecotoxicity and human health toxicity. Toxicity assessments were based on the USEtox impact assessment method (Bijster et al., 2018). Relying on life cycle assessment as a tool to evaluate the impacts beyond these two materials.
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