An Electron-Balance Based Approach to Predict the Decreasing Denitrification Potential of an Aquifer.

摘要: Numerical models for reactive transport can be used to estimate the breakthrough of a contaminant in pumping well or at other receptors. However, as natural aquifers are highly heterogeneous with unknown spatial details, predictions on aquifer scale require stochastic framework uncertainty analysis. The high computational demand spatially explicit reactive-transport hampers such analysis, thus motivating search simplified estimation tools. We suggest performing an electron balance between reactants infiltrating solution and matrix obtain hypothetical time dissolved-reactant receptor if reaction was instantaneous. This we denote advective instantaneous (τinst ). It depends amount partner present matrix, mass flux dissolved reactant, stoichiometry. While shape reactive-species curve various kinetic parameters, overall timing scales τinst . calculate latter by particle tracking. effort computing is so low that calculations become feasible. apply concept two-dimensional test case aerobic respiration denitrification. A detailed model includes microbial dynamics. Scaling local curves observed individual points decreased variability electron-donor significantly. conclude efficient estimating over which retains its degradation potential.