Analytical approximation of biodegradation rate for in situ bioremediation of groundwater under ideal radial flow conditions

摘要

We derive the long-term biodegradation rate of an organic contaminant(substrate)for an in situ bioremediation model with axisymmetric flow conditions. The model presumes that a nonsorbing electron acceptor is injected into a saturated homogeneous porous medium which initially contains a sorbing substrate and attached indigenous microorganisms. The derived analytical removal rate depends upon the injection flow rate, the initial substrate and supplied acceptor concentrations, the stoichiometric coefficient for acceptor utilization, and the sorption characteristics of the substrate; the removal rate does not depend upon the dispersion parameters, microbial kinetic parameters, and initial biomass concentration.