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System Type:

Biological Reactive System—This was the first large-scale in situ bioremediation project to degrade chlorinated solvents Installed with teaming partner FRx

Industrial Facility, South Carolina, Installed in October, 2000, after installing an earlier pilot BioNet as a “proof of concept and capability.”

Terracon Environmental, Wheat Ridge, Colorado

Project Description:

Foremost's scope of services for this project included the review of previous site data, development of a plan to collect supplemental data, then design and install the BioLuxing remediation system. Contaminants included tetrachloroethene (PCE), tricholoroethene (TCE), dichloroethene (DCE), and vinyl chloride (VC). By using jetting and fracturing techniques, the in-situ treatment system included 88 BioLuxes™ in 22 BioNets™ emplaced with a slurry containing Isolite, nutrients and anaerobic microbes to remediate groundwater from six to 33 feet below ground surface. The Bioluxes are up to one-half inch thick and range in diameter from 50 to 60 feet. BioLuxes were installed approximately every three feet ranging from three to seven BioLuxes per BioNet. This extensive project requires minimal on-going operation and maintenance, primarily perodic pumping of selected liquid nutrients into the BioNets to recharge the system. Project costs, which included the first year O&M were about $550,000.
Routine monitoring at approximately one-third of the monitoring locations indicated that PCE and TCE were apparently biotransformed to MCL's within a period of nine (9) months after installation of the treatment system. At the location with the highest concentration of PCE (104,000 ug/L) the PCE concentration was reduced by 82 percent to 19,100 ug/L and the TCE concentration was reduced by 68 percent from 31,500 to 10,000 ug/L. Transient accumulations of VC were observed and DCE was detectable. These preliminary remediation results suggest high concentrations of chlorinated solvents can be eliminated or significantly reduced relatively quickly by using a BioLuxing delivery system to stimulate indigenous bacteria with a properly designed formulation of electron donors. Laboratory process development results have been successfully transferred to the field-scale remediation.
The cost of the BioLuxing system which treated the entire 32-acre site was approximately one-half the cost of an alternative system previously planned just as a down-gradient treatment barrier for the site. The process used at this site may be duplicated at similar sites contaminated with chlorinated solvents or other recalcitrant contaminants. If the appropriate indigenous bacteria are not present at the site, such bacteria can be cultured in the laboratory and delivered to the BioLuxes during the installation process or after installation. A paper entitled "Anaerobic In-Situ Bioremediation of Chlorinated Solvents at an Industrial Site," which was published in the proceedings of The Third International Conference on Remediation of Chlorinated and Recalcitrant Compounds (May 20-23, 2002; Monterey, CA), can be viewed using the Adobe Acrobat Reader by clicking Bioremediation of Chlorinated Solvents under the main heading of Technical Papers.

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