This application was originally presented in the User's Manual for the original HBGC code (Yeh et al., 1998). The following problem description was taken directly from that document.
The input file name is "biodegr.in", the superfile is "hbgc123d.bio".
This example addresses bioremediation in a hypothetical aquifer system. The physical system is represented using one-dimensional transport through a region 100 dm long. Initially, a zone located at 20 dm < x < 30 dm contains a biodegradable substrate and the microorganisms capable of doing so. The initial concentrations of substrate and biomass are S0 = 200 mg/L and b0 = 0.001 U.O.D., respectively. The biodegradation reaction parameters are KS = 7.5 mg/L, YS = 0.130E-3, and µmax = 0.0387 /h. The substrate is present in the aqueous phase and its mobility is assumed not to be retarded by interactions with the porous media. The physical parameters selected to describe the system are porosity = 0.2, bulk density = 1.5 kg/dm3, pore water velocity = 1 cm/h, and longitudinal dispersivity = 0.5 cm. 81 nodes and 52 elements (two rows of 26 elements) were used to discretize the region of interest. A uniform time step of 0.1 hours is used.
The case considered here reflects the condition that biomass colonies have become established only in the zone in which the substrate is initially present and are adsorbed to the porous media (i.e. the biomass is immobile).
Reference
Yeh, G.-T., Salvage, K. M., Gwo, J. P., Zachara, J. M., and Szecsody, J. E. (1998): HydroBioGeoChem: A Coupled Model of Hydrologic Transport and Mixed Biogeochemical Kinetic/Equilibrium Reactions in Saturated-Unsaturated Media. Report ORNL/TM-13668. Oak Ridge National Laboratory, Oak Ridge, TN.