Assessing TCE source bioremediation by geostatistical analysis of a flux fence

Ground Water
Zuansi CaiDavid N Lerner

Abstract

Mass discharge across transect planes is increasingly used as a metric for performance assessment of in situ groundwater remediation systems. Mass discharge estimates using concentrations measured in multilevel transects are often made by assuming a uniform flow field, and uncertainty contributions from spatial concentration and flow field variability are often overlooked. We extend our recently developed geostatistical approach to estimate mass discharge using transect data of concentration and hydraulic conductivity, so accounting for the spatial variability of both datasets. The magnitude and uncertainty of mass discharge were quantified by conditional simulation. An important benefit of the approach is that uncertainty is quantified as an integral part of the mass discharge estimate. We use this approach for performance assessment of a bioremediation experiment of a trichloroethene (TCE) source zone. Analyses of dissolved parent and daughter compounds demonstrated that the engineered bioremediation has elevated the degradation rate of TCE, resulting in a two-thirds reduction in the TCE mass discharge from the source zone. The biologically enhanced dissolution of TCE was not significant (~5%), and was less than expected. How...Continue Reading

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Citations

Dec 3, 2014·Journal of Contaminant Hydrology·Michael O RivettGary P Wealthall
May 13, 2015·Journal of Contaminant Hydrology·Michael C BrooksMichael D Annable
Jun 30, 2019·Journal of Contaminant Hydrology·Alexander A HaluskaMichael D Annable

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