Earth Tech Successfully Demonstrates in situ Reductive Treatment of Groundwater Contaminated with Explosives and Nitrate Using HRC®

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Courtesy of REGENESIS

Earth Tech has recently completed the first field-scale demonstration of in situ treatment of explosives-contaminated groundwater using Hydrogen Release Compound (HRC®). Explosives and nitrate contamination in groundwater are widespread at military facilities worldwide and, until now, have been difficult and expensive to address.

The study, completed in January 2001, was performed by Earth Tech’s Pueblo Chemical Depot field office in Pueblo, Colorado. Conducted in a 300’ by 300’ area of a thin alluvial aquifer, the study demonstrated that in situ treatment with HRC could affect the reduction of nitroaromatic explosives and nitrate. Risk-based treatment standards for the site were achieved for all contaminants present within 106 days of injection of the HRC product. Area of influence and
treatment progress proved to be easy and inexpensive to monitor using field measurements of indicator parameters such as oxidation-reduction potential (ORP) and chemical oxygen demand (COD). The results for 1,3,5-TNB are shown in Figure 1 and are typical of the results observed for RDX, nitrate (Figures 2 and 3), and2,4-DNT.

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