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U.S. EPA Technology Innovation and Field Services Division

Heat Enhanced Hydrolysis of Energetic Compounds and Field Results

Sponsored by: Society of American Military Engineers (SAME) Denver Post, SAME Philadelphia Post, and US EPA

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The Society of American Military Engineers (SAME) Denver Post and Philadelphia Post along with the US Environmental Protection Agency (EPA) are hosting a series of webinars based on talks given at recent Design and Construction Issues at Hazardous Waste Sites (DCHWS) Symposiums. The mission of the DCHWS symposiums is to facilitate an interactive engagement between professionals from government and the private sector related to relevant and topical issues affecting applications of engineering and science associated with cleaning up hazardous waste sites. The symposiums also serve as a platform to facilitate the exchange of information, encourage dialogue, share experiences, and build and enhance communication among design and construction professionals.

The USACE Omaha District contracted TRS Group, Inc. (TRS) and HydroGeoLogic, Inc. (HGL) to implement 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. Applying electrical resistance heating (ERH) at sub-steaming temperatures, TRS is heating vadose zone soils.

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). RDX, TNT, and 2,4-DNT were observed with maximum concentrations of 41 milligrams per kilogram (mg/kg),10 mg/kg, and 4.6 mg/kg, respectively. As PETN was only detected in trace concentrations, the study is focused on the TNT, 2,4-DNT and RDX, with RDX being the primary contaminant of interest.

TRS is heating the treatment volume soil to an average of 80°C over a period of about two months and maintaining temperature for four additional months. TRS and HGL selected the temperature to maximize hydrolysis kinetics without generating steam. Hydrolysis is a water-based reaction. Under ambient conditions the reaction rate is sufficiently slow as to not be a viable remedy; however, at elevated temperatures the reaction rates become quite favorable. The moisture content within the bulk soil ranges between 30 to 40 percent, as commonly found in this type of geologic setting, and is sufficient to support hydrolysis. To ensure proper energy delivery, TRS drips water to each electrode to maintain conductivity at the electrode/soil interface. This added water contributes to the bulk soil moisture content and ensures hydrolysis continues throughout treatment.

TRS initiated power input to the subsurface in July 2019. Following four months of heating, soil samples were collected in November 2019. An additional round of soil sampling is planned 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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It is EPA's policy to make reasonable accommodation to persons with disabilities wishing to participate in the agency's programs and activities, pursuant to the Rehabilitation Act of 1973, 29 U.S.C. 791. Any request for accommodation should be made to at or , preferably one week or more in advance of the webinar, so that EPA will have sufficient time to process the request. EPA would welcome specific recommendations from requestors specifying the nature or type of accommodation needed. Please note that accommodation requests for closed captioning are not necessary. Closed captioning is being provided for all CLU-IN webinars as of October 1, 2016.

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This webinar is intended solely to provide information to the public. The views and opinions expressed as part of this webinar do not necessarily state or reflect those of the U.S. Environmental Protection Agency. It is not intended, nor can it be relied upon, to create any rights enforceable by any party in litigation with the United States, or to endorse the use of products or services provided by specific vendors. With respect to this webinar, neither the United States Government nor any of their employees, makes any warranty, express or implied, including the warranties of merchantability and fitness for a particular purpose, or assumes any legal liability or responsibility for the accuracy, completeness, or usefulness of any information, apparatus, product, or process disclosed, or represents that its use would not infringe privately owned rights.

Presenters:

Cindy CraneCindy Crane, HydroGeoLogic, Inc. (ccrane@hgl.com or 603-244-5186)
Cindy Crane, Ph.D., P.E., has 27 years of experience in investigation and remediation of contaminated sites, including field testing a variety of remediation technologies such as heat-enhanced reductive dechlorination, surfactant-enhanced LNAPL extraction, and groundwater recirculation for amendment distribution. As HGL's Technical Director of Engineering, she focuses on the development and implementation of in situ remediation strategies.


Emily Crownover, PhDEmily Crownover, PhD, TRS Group, Inc (ecrownover@thermalrs.com or 360-846-8963)
Emily Crownover is a lead engineer at TRS overseeing engineers supporting thermal remediation projects through site design, construction, operations, and research and development. She joined TRS after obtaining her Ph.D. in Bioengineering from the University of Washington-Seattle. She leads the TRS research and development program including PFAS treatment in water and soil, 1,4-dioxane remediation, and low temperature heating to enhance degradation pathways.


Molly MaxwellMolly Maxwell, USACE
Molly Maxwell is the Formerly Used Defense Site (FUDS) Program Manager for the Omaha District, U.S. Army Corps of Engineers. She received her Bachelors of Science in Biochemistry, Biology and Bio-Agricultural Sciences from Colorado State University. Later, she received her Masters of Science from the University of Hawaii - Manoa in Microbiology. She has over 20 years experiences in remedial activities conducted in the private and government sectors. She has worked at USACE for 11 years in various roles and is an active advocate for the use of innovative remedial technologies.


Moderators:

Jean BalentJean Balent, U.S. EPA Technology Innovation and Field Services Division (balent.jean@epa.gov or 703-603-9924)
Ms Balent is on the staff of the EPA's Technology Innovation and Field Services Division where she has worked to collect and disseminate hazardous waste remediation and characterization information since 2003. Ms Balent manages the Clean Up Information Network website and actively supports online communication and collaboration resources available to EPA. She formerly worked with the US Army Corps of Engineers Environmental Engineering Division in the Buffalo District. Ms Balent was also a member of the SUNY-Buffalo Groundwater Research Group where she constructed and tested large scale models of groundwater flow. Ms Balent has also conducted research relating to the Great Lakes, environmental remediation, and brownfields re-development. She holds a Bachelor's degree in environmental engineering from SUNY-Buffalo and a Master's degree in Information Technology from AIU.


Kate GarufiKate Garufi, EPA OSRTI (garufi.katherine@epa.gov or 703-517-5857)
Kate Garufi is the design and construction subject matter expert in the EPA Headquarters Office of Superfund Remediation and Technology Innovation. She has a Bachelor of Science in Chemical Engineering from Virginia Tech and a Master of Science in Environmental Engineering from Johns Hopkins University. She has over 15 years of experience in EPA Headquarters providing policy and technical support to all ten Regions for topics including design and remedial action scoping project management and groundwater policy development. In addition, she is the chair for the Adaptive Management Task Force Workgroup which is conducted six pilot projects to support future guidance development in this area.


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 April 8, 2020: Heat Enhanced Hydrolysis of Energetic Compounds and Field Results

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Rehabilitation Act Notice for Reasonable Accommodation

It is EPA's policy to make reasonable accommodation to persons with disabilities wishing to participate in the agency's programs and activities, pursuant to the Rehabilitation Act of 1973, 29 U.S.C. 791. Any request for accommodation should be made to at or , preferably one week or more in advance of the seminar, so that EPA will have sufficient time to process the request. EPA would welcome specific recommendations from requestors specifying the nature or type of accommodation needed, such as closed captioning.



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Technology Integration and Information Branch

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Technology Integration and Information Branch

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