Comparaison des approches systémique, mécanique des fluides numérique et compartimentale pour la modélisation des réacteurs : application à un réacteur canal à boues activées

Abstract : The purpose of this work is the comparison of the systemic, computational fluid dynamics (CFD) and compartmental approaches. This last approach is a new method of model construction based on the quantitative results of a CFD simulation. A methodology to build such a model is described. These three modelisation approaches have been used to model a bench scale activated sludge wastewater treatment reactor : a complex biological tree-phase reactor (gas/liquid/floc). The CFD modelling has been validated with velocity and turbulence fields, obtained with laser doppler velocimétry and with void fraction measurements obtained with an optical probe. The global hydrodynamics of the reactor is well represented by a plug flow model with axial dispersion. This behaviour is well represented by CFD simulation of residence time distribution. Experiments on the bench scale activated sludge reactor fed with a synthetic substrate primarily composed of Viandox have been carried out. Biological reactions have been modelled by the ASM1 model developped by IWA. Evolution of almost all the concentrations along the reactor are simulated with a maximum error of 25 \% with systemic and CFD models. Some differences are highlighted between these two models. The compartmental model gives almost the same results as the CFD model with a calculation time from 10 to 20 times shorter. Moreover this compartment model is as easy to handle as the sytemic model and allows a better understanding of the phenomena which take place in the reactor than the CFD model
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Yann Le Moullec. Comparaison des approches systémique, mécanique des fluides numérique et compartimentale pour la modélisation des réacteurs : application à un réacteur canal à boues activées. Autre. Institut National Polytechnique de Lorraine, 2008. Français. ⟨NNT : 2008INPL053N⟩. ⟨tel-01752997⟩

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