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Couplage matériau-procédé d'adsorption pour l'élimination sélective d'arsenic présent en traces dans les eaux

Abstract : Arsenic remains toxic even at low ingestion rates and its concentration is limited to 10 µg L-1 in drinking waters. ln bottled waters, arsenic can be removed with an adsorption process using a natural manganese oxide as an adsorbent. This process requires a high capacity as weIl as selectivity and should answer food agreement. Through a parallel approach using both chemical engineering and material sciences tools, this work proposes a better understanding of the process. Although arsenic does not adsorb specifically on manganese oxides, thanks to its high affinity no competition with major water species occurs. pH appeared as a key parameter and adsorption capacity greatly increased as pH decreased. InternaI mass transfer limitations were identified with both batch and column experirnents and flow rate and particle size influences on breakthrough curves were rnodelled. A regeneration procedure was tested. Results showed that capacity rernained steady through regeneration cycles and sorne clues were given to minimize the adsorbent degradation. Fine characterization of the adsorbent led to the identification of sorne capacity control parameters. On the whole, key parameters governing the process were defined. Prediction and modelling tools were proposed for performance assessment for wide water types and operating conditions.
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https://hal.univ-lorraine.fr/tel-01749810
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Stéphanie Ouvrard. Couplage matériau-procédé d'adsorption pour l'élimination sélective d'arsenic présent en traces dans les eaux. Autre. Institut National Polytechnique de Lorraine, 2001. Français. ⟨NNT : 2001INPL588N⟩. ⟨tel-01749810⟩

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