Transport dans les sols de cokerie de HAP issus de particules de goudron de houille

Abstract : Coke production processes caused the incorporation of coal tars (NAPL or particle) into soils, these coal tars contain high amount of PAH. The aim of the present work was the investigation of the dynamics of the source term, nainely coal tar particles, as weIl as the transport of PAH through aged contaminated soils. ln this goal, soil and coal tar samples were collected from brown field of an ancient coking plant. They were characterised by the analytical techniques of organic geochemistry (GC-MS, IR microspectroscopy). PAH transfer from coal tar particles into water was investigated by mean of closed loop laboratory column experiments. Results were interpreted by an equilibrium partitioning model and a mass transfer model. These models enabled us to compute a partitioning constant as weIl as effective diffusivities at various particle sizes and temperatures. PAH release and transport through contaminated soil was studied by laboratory column experiments, followed by phase separation of the collected fractions (ultrafiltration and ultracentrifugation). This method enabled us to show that PAH concentrations in the aqueous phase were most often higher than their aqueous solubility, and that the transport of a major fraction was facilitated by colloids and/or high molecular weight macromolecules. The com- parison between the data obtained by organic analysis showed analogy between the PAH spectra in the different phases. FinaIly, the potentiality of reactive tracers to measure global parameters (organic carbon fraction foc and sorbant organic phase/water interface are a) was tested. Conversely to phenol, toluene tracing enabled us to measure foc whereas sodium octylbenzenesulfonate did not allow the measurement of the interface area. As a conclusion, this research brought new results on the source term dynamics and PAH transport through contaminated soil from a former coking plant in aqueous and colloidal phases, that are the basis of a conceptual model and a first point to upscaling at the pilot and field scales.
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http://docnum.univ-lorraine.fr/prive/INPL_T_2005_BENHABIB_K.pdf
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Submitted on : Thursday, March 29, 2018 - 12:34:55 PM
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Karim Benhabib. Transport dans les sols de cokerie de HAP issus de particules de goudron de houille. Sciences agricoles. Institut National Polytechnique de Lorraine, 2005. Français. ⟨NNT : 2005INPL024N⟩. ⟨tel-01749974⟩

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