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Measuring Carbon-based Contaminant Mineralization Using Combined CO2 Flux and Radiocarbon Analyses

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Methodology for comparing source and plume remediation alternatives.

Ronald W Falta¹

¹Department of Environmental Engineering and Earth Science, Clemson University, Clemson, SC 29634-0919, USA. faltar@clemson.edu

|February 13, 2008

Summary

A new mass balance approach aids decisions for contaminated site remediation by simulating groundwater source and plume cleanup. This quantitative tool helps compare alternatives for effective contaminant removal.

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Area of Science:

Environmental Engineering
Hydrogeology
Contaminant Transport Modeling

Background:

Remediation decisions at contaminated sites lack quantitative tools for comparing source and plume cleanup strategies.
Effective management requires understanding the transient effects of simultaneous groundwater source and plume remediation.

Purpose of the Study:

Develop a screening-level mass balance approach for simulating simultaneous groundwater source and plume remediation.
Provide a quantitative tool to compare remediation alternatives at contaminated sites.

Main Methods:

A contaminant source model based on a power function relating source mass and discharge, allowing for partial remediation.
An analytical plume model with one-dimensional flow and three-dimensional dispersion, using the source model as a time-dependent mass flux boundary condition.
Simulation of first-order sequential decay and production of multiple species with variable decay rates and yield coefficients.

Main Results:

The developed approach allows flexible simulation of natural attenuation and enhanced plume degradation.
It accommodates temporary, delayed, or spatially limited plume remediation efforts.
The model can account for varying chemical effects on different contaminant species within a decay chain.

Conclusions:

The new mass balance approach provides a quantitative tool for evaluating complex remediation scenarios.
It supports informed decision-making for optimizing cleanup strategies at contaminated groundwater sites.
This method enhances the simulation of contaminant transport and degradation under various remediation interventions.