Geoelectrical measurement and modeling of biogeochemical breakthrough behavior during microbial activity

Slater, L. D.; Day-Lewis, F. D.; Ntarlagiannis, D.; O'Brien, M.; Yee, N.

Abstract:

We recorded bulk electrical conductivity (??_b) along a soil column during microbially-mediated selenite oxyanion reduction. Effluent fluid electrical conductivity and early time ??_b were modeled according to classic advectivedispersive transport of the nutrient medium. However, ??_b along the column exhibited strongly bimodal breakthrough which cannot be explained by changes in the electrical conductivity of the pore fluid. We model the anomalous breakthrough by adding a conduction path in parallel with the fluid phase, with a time dependence described by a microbial population-dynamics model. We incorporate a delay time to show that breakthrough curves along the column satisfy the same growth model parameters and offer a possible explanation based on biomass-limited growth that is delayed with distance from influent of the nutrient medium. Although the mechanism causing conductivity enhancement in the presence of biomass is uncertain, our results strongly , suggest that biogeochemical breakthrough curves have been captured in geoelectrical datasets. Copyright 2009 by the American Geophysical Union.

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70036973

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Slater, L. D.; Day-Lewis, F. D.; Ntarlagiannis, D.; O'Brien, M.; Yee, N.

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English

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Geophysical Research Letters

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Geoelectrical measurement and modeling of biogeochemical breakthrough behavior during microbial activity; 2009; Article; Journal; Geophysical Research Letters; Slater, L. D.; Day-Lewis, F. D.; Ntarlagiannis, D.; O‘Brien, M.; Yee, N.