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MODELING OF SUBSURFACE BIOBARRIER FORMATION

Biofilm-forming microbes can form biobarriers to inhibit contaminant migration in groundwater. Also subsurface biofilms have the potential for biotransformation of organic contaminants to less harmful forms, thereby providing an in situ method for treatment of contaminated groundwater supplies. We present a mathematical and numerical model to describe the population distribution and growth of bacteria in porous media. The model is based on the convection-dispersion equation with nonlinear reaction terms. Accurate numerical simulations are crucial to the development of contaminant remediation strategies. We use the nonstandard numerical approach that is based on nonlocal treatment of nonlinear reactions and modified characteristic derivatives. It leads to significant, qualitative improvements in the behavior of the numerical solution. Numerical results for a simple biobarrier formation model are presented to demonstrate the performance of the proposed new method. We show comparisons with experimental results obtained from Montana State’s Center for Biofilm Engineering.