U.S. EPA Contaminated Site Cleanup Information (CLU-IN)

U.S. Environmental Protection Agency
U.S. EPA Technology Innovation and Field Services Division

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Heat Enhanced Hydrolysis of Energetic Compounds and Field Results
Internet Seminar
The USACE Omaha District implemented a low temperature thermal pilot study to evaluate the effects of in situ heating to enhance the hydrolysis of munition constituents (MCs) found in soil. Heating of vadose zone soils is occurring through the application of electrical resistance heating (ERH) at sub-steaming temperatures. The site was established to receive and store ammunition and was placed into inactive status in 1967. The area to be targeted by the pilot study is a former leach bed, contaminated with munition compounds, which include hexahydro-1,3,5-trinitro-1,3,5-trazine (RDX), trinitrotoluene (TNT), dinitrotoluene (DNT), and pentaerythritol tetranitrate (PETN). The treatment volume soil was heated to an average of 80°C over a period of about two months starting in July 2019 and maintained temperature for four additional months. Following four months of heating, soil samples were collected in November 2019. An additional round of soil sampling occurred after six months of heating in January 2020. The presentation will focus on the innovative approach to enhancing hydrolysis, results of low temperature ERH remediation, including MC data from various confirmation soil sampling events, and lessons learned when implementing a low temperature thermal remedy.
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