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LONG-TERM EVALUATION OF AN EHC INJECTION PERMEABLE REACTIVE BARRIER IN A SULFATE-RICH, HIGH-FLOW AQUIFER
Molin, J., J. Valkenburg, A. Seech, R. Oesterreich, and J. Son.
Remediation Journal 29(3):17-29(2019)

A direct-push injection permeable reactive barrier (PRB) composed of EHC® was installed in 2005 to intercept a 2,500-ft carbon tetrachloride (CT) groundwater plume at a site in Kansas. The PRB was constructed by injecting EHC® in situ chemical reduction reagent slurry into a line of direct push injection points. The PRB achieved a >99% removal rate 16 months after installation. The 2-yr removal rate decreased to ~95% and plateaued for 12 yrs post-injection. While the organic carbon was consumed faster than expected, the PRB has continued to support a high degree of treatment for >12 yrs. Recycling of biomass and the contribution from a reduced iron sulfide mineral zone are discussed as possible explanations for the sustained reducing conditions and continued chloromethane treatment.



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