Thursday, August 14, 2008 - 8:30 AM
S139
Hydrogeochemical Constraints on In-Situ Bioremediation
Michael J. Barcelona, Department of Chemistry, Western Michigan University, 3442 Wood Hall, Kalamazoo, MI 49008
In-situ bioremediation of organic contaminants has progressed significantly over the past two decades. Once considered a novelty, bioremediation has evolved far beyond early descriptions of “natural attenuation capacity.” Both active and passive in-situ methods can include manipulation of oxidation-reduction and geochemical conditions. For plumes ofchlorinated hydrocarbon contaminants, for example, this could include the addition of a carbon source (electron donor) to support successive dechlorination (e.g. tetrachloroethylene to trichloroethylene to dichloroethylene). The mode of addition may include hydraulic injection of a slurry or injection into wells to create a permeable reactive barrier (PRB) supplying carbon-rich ground-water. The success of such efforts in the long-term is dependent on the cost and mass loading of the electron donor since the dictate the frequency with which the PRB must be replenished. Advanced hydrogeochemical and geophysical methods can be used to account for aquifer heterogeneities which might otherwise compromise the integrity of the barrier and the cost-effectiveness of the treatment technology. These approaches also improve site-characterization and monitoring program planning and operation. Selected successful case-studies using these methods will be presented.
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See more of The Annual Meeting and Exhibition 2008 (August 10 - 14, 2008)
See more of Invited Oral Papers
See more of The Annual Meeting and Exhibition 2008 (August 10 - 14, 2008)