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Caractérisation physico-chimique d’un sédiment marin traité aux liants hydrauliques : Évaluation de la mobilité potentielle des polluants inorganiques

Abstract : The dredging of French ports generates each year between 25 to 40 million tons of uncontaminated materials which are piled onto sea. Moreover, an important stock of contaminated sediments (about 10 million tons), which has to been dredged, exists. Indeed, the decree of June 14th, 2000 prohibits disposal to sea when levels of contamination exceed regulations. This important stock of sediment, which must be imperatively dredged within 10 years, is almost orphan of adapted treatment and valorization. In this context many research program appear to propose and to develop solutions. The SEDiGEST program (Management of the dredging sediments of ports) intends a scenario of filling terrestrial cavities with treated sediments. This Ph.D. thesis, carried out within the framework of this program, contributes to the improvement in understanding the geo-physico-chemical behavior of marine sediment stabilized with hydraulic binders (cement + lime). In this objective, the experimental approach was conducted in three steps. Firstly, a characterization of the solid was realized. An evaluation of the potential mobility of inorganic pollutants have was then determined. Finally, a modeling of the behavior towards leaching was operated. Data shown that target's inorganic pollutants of the matrix of study (copper, lead and zinc) were mainly associated with carbonates, sulfides/sulfates, (oxy)hydroxides, and/or with organic matter. Comparative study of the matrix at three levels “of evolution” (before and after treatment and artificially aged) highlights the reversibility of the stabilization by hydraulic binders. Indeed, treated sediment presents a pollution risk to less or more long term, leaching of copper and lead, during carbonation.
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Submitted on : Thursday, November 8, 2012 - 3:47:12 PM
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Marie Loustau Cazalet. Caractérisation physico-chimique d’un sédiment marin traité aux liants hydrauliques : Évaluation de la mobilité potentielle des polluants inorganiques. Autre. INSA de Lyon, 2012. Français. ⟨NNT : 2012ISAL0012⟩. ⟨tel-00749917⟩

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