Séminaire de Timothy Ginn (University of California at Davis, USA)



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Vendredi 25 Mai 2012 à 14h00, en salle de conférences de l'OSUR (RDC du bât 14b, campus de Beaulieu, UR1),Timothy Ginn propose un séminaire intitulé

Vendredi 25 Mai 2012 à 14h00, en salle de conférences de l'OSUR (RDC du bât 14b, campus de Beaulieu, UR1),Timothy Ginn propose un séminaire intitulé

Modeling Microbiological Processes in Contaminant Hydrogeology

The incorporation of microbial processes into hydrogeological models has followed two main paths of investigation: (1) transport of bacteria as colloids in porous media, and (2) biodegradation of dissolved contaminants by an immobile phase of bacteria. Quantification of these processes is necessary in order to include microbial effects in the modeling of groundwater quality. Because essentially all transformations of important solutes in groundwater are in some way microbially-mediated, the quantification of microbial processes is a common requirement. Transport of microbes and degradation by microbes may be linked, as when a change in microbial metabolic activity alters the attachment/detachment rates of bacteria to surfaces, either promoting or retarding bacterial transport in a groundwater-contaminant plume. Changes in metabolic activity, in turn, are controlled by the time of exposure of the microbes to electron acceptors/donor and other components affecting activity. Thus, quantitative analysis of microbial processes often require understanding of the linkages between solute advection dispersion, sorption and diffusion, and microbial metabolic activity, growth, and attachment/detachment rates, that can be tested experimentally. This talk presents an overview of current approaches used to represent physicochemical and biological processes in porous media, with particular attention to the constitutive theory used in establishment of governing equations for reactive contaminant transport and bioremediation in the natural subsurface.


Contact : Timothy Ginn
Contact OSUR : Tanguy Le Borgne (Géosciences)