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ADDITION OF DIVALENT IRON TO ELECTRON DONOR MIXTURES FOR REMEDIATION OF CHLORINATED ETHENES: A STUDY OF 100 WELLS
Davis, D. and O.J. Miller.
Remediation Journal 29(1):37-44(2018)

The objective of this study was to assess the effects of adding soluble divalent iron (DVI) to emulsified electron donor mixtures to promote the biogeochemical destruction of four common chlorinated ethenes—PCE, TCE, cis-1,2-DCE, and VC—as part of electron donor mixture-enhanced reductive dechlorination treatments in groundwater. The study encompassed 24 project sites comprising 100 performance monitoring wells across the United States. Wells that received DVI treatment showed increased dechlorination rates, improved contaminant reduction, and limited daughter product formation relative to untreated wells. Following injection of electron donor treatments and DVI, the time required for a well to reach 90% reduction from a peak concentration was improved for the 25, 50, and 75% confidence intervals for the four chlorinated ethenes studied relative to an approach using electron donor mixture treatments alone. The total improvement in time to degrade chlorinated ethenes through VC was also improved. Daughter product formation was less for wells where DVI was added to the electron donor mixture. The cost to add a DVI amendment was less than $3 per cubic yard as applied.



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