Computational Modelling of the Contaminant Transport ...

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XVI International Conference on Computational Methods in Water Resources (CMWR-XVI) Ingeniørhuset

Computational Modelling of the Contaminant Transport with Biodegradation Processes and Physical Sorption in a Saturated Porous Medium
Paper
Author:Sandra Malta <smcm@uniriotec.br> (Federal University of the Rio de Janeiro State)
Paula Couto <prlima@lncc.br> (National Laboratory of Scientific Computation)
Presenter:Sandra Malta <smcm@uniriotec.br> (Federal University of the Rio de Janeiro State)
Paula Couto <prlima@lncc.br> (National Laboratory of Scientific Computation)
Date: 2006-06-18     Track: General Sessions     Session: General
DOI:10.4122/1.1000000253
DOI:10.4122/1.1000000254

The aim of this work is to show a computational modelling of the contaminant transport with biodegradation processes and physical sorption in a saturated porous medium, which characterizes a stage of subsurface contamination by organic contaminants. Sorptions in equilibrium and non-equilibrium mode are incorporated upon the model and the sorption isotherms are set as Freundlich kind. Moreover, aerobic biodegradation is modeled through the double and simple minimum-rate Monod kinetics. Mathematically, the problem is given by a non-linear advection-diffusion- reaction partial differential system coupled by the reaction terms, which are associated to the kinetics that governs the biodegradation processes. Solving these nonlinear equations simultaneously may be very costly in computation time. Thus, an operator-splitting operator scheme is employed for treating in a sequential fashion the convection-diffusion and reaction terms. The finite difference and stabilized finite element (SUPG) methods are used in the time and spatial discretizations, respectively, combined with a linearization algorithm, to solve the convection- diffusion transport system, and then reaction is approximated by Newton-Raphson type methods