Évaluation de l’impact environnemental des mâchefers d’incinération d’ordures ménagères utilisés en technique routière

Abstract : The present study copes with the environmental impact assessment of municipal solid waste incineration bottom ash reused as aggregates in road construction. The methodology involves the following steps: characterization of bottom ashes (physical properties, chemistry and mineralogy), experiments at laboratory scale, field study and geochemical modeling. Quantitative data for trace elements in primary glasses obtained by Secondary Ions Mass Spectrometry (SIMS) microanalysis show that these glasses are likely a main sink for Zn, in the cemented calcite admixture, lead seems to be mainly sorbed on iron oxyhydroxides according to SMS imaging and Extended X-ray Absorption Fines Structure analysis (EXAFS). Except for SO4, low concentrations and alkalinity were measured in leachates from a 10 year-old road built with MSWI BA (fast attenuation during the fi rst years). No significant transformation of bottom ashes (such as an advanced carbonation state) was observed after 10 years of utilization. Lateral preferential flowpaths are probably responsible for the difference between alkaline pore water and diluted leachates. Based on characterization and experimental data, common model was built to simulate leaching and mineralogical evolutions using the transport reactive code CHESS-HYTEC. Simulations of batch and dynamic leaching tests, as well as of two roads (French and Swedish) built with bottom ashes show fair agreement with respect to the experimental data.
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Rabia Badreddine, David Dabo, L. de Windt. Évaluation de l’impact environnemental des mâchefers d’incinération d’ordures ménagères utilisés en technique routière. Rapport Scientifique INERIS, 2009, 2008-2009, pp.42-44. ⟨ineris-01869244⟩

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