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Development of a microbiologic module for hydrobiogeochemical modelling and applications on arsenic mobility

Marc Parmentier
Abstract : The geochemistry of natural system as old mine site is influenced by biological activity. Only informatics tools taking into account geochemistry, hydrodynamics and microbiology will be able to analyse, and then predict, this complex system evolution. For about ten years numerical tools, as CHESS and HYTEC, are able to take into account most of the geochemical and hydrodynamical processes present in soil. The goal of this work is to extend this tools to the microbiologic activity. CHESS calculate the geochemical equilibrium speciation using a modified Newton-Raphson process. The same method is extended to the calculation of reactions mechanisms containing biological kinetics. Most of the biological kinetic laws can now be used: Monod law, inhibition law and thermodynamical law. Moreover others options of this tools, like coupling with transport process (HYTEC), are maintained. The implementation of this code is first verified by the modelling of several cases from literature. The code is then used for the calculation of experimental study realized at the BRGM, involving a bacterial consortium responsible of a reductive dissolution of an hydrous ferric oxyde (HFO) enriched by arsenic. The non congruent mobilisation of Fe and As is explained by sorption on HFO and activity of two bacterial metabolism which degrades organic matter and reduced Fe and As. The old site mine of Carnoules (Gard, French) is studied. The experiments, realized at the university of Montpellier, permitted to study the natural biogeochemical evolution of acid mine drainage. The calculation take into account the biologic aerobic oxidation of Fe and As and the precipitation of amorphous Fe-As gel. The kinetic and thermodynamic parameter are the used on a modelling at the field scale. These applications prove the interest of the computational tools in understanding water-mineral interface, in which precipitation-dissolution can be controlled by bacterial population. Moreover, CHESS and HYTEC extension permitted to considerably extend the fields of applications.
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Submitted on : Monday, April 30, 2007 - 8:00:00 AM
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Marc Parmentier. Development of a microbiologic module for hydrobiogeochemical modelling and applications on arsenic mobility. Chemical Sciences. École Nationale Supérieure des Mines de Paris, 2006. English. ⟨pastel-00002404⟩

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