Contaminated Site Clean-Up Information (CLU-IN): Internet Seminar Video Archives

Since 1998, The Contaminated Site Clean-Up Information (CLU-IN) website has presented Internet Seminars covering a wide variety of technical topics related to hazardous waste characterization, monitoring, and remediation. For select seminar topics offered since 2012, we are making complete video recordings available through our archives. This feed contains all video seminars archived in the last 12 months. For a complete list of seminars archived since 2000, please visit http://www.clu-in.org/live/archive/. Our Rehabilitation Act Notice for reasonable accommodation is available at http://www.clu-in.org/training/accommodation.cfm. CLU-IN was developed by the U.S. Environmental Protection Agency (EPA) but is intended as a forum for all waste remediation stakeholders. For more information and to view upcoming live offerings, please visit http://www.clu-in.org/live/. For a complete list of RSS feeds available on CLU-IN, please visit http://www.clu-in.org/rss/about/.

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Heat Enhanced Hydrolysis of Energetic Compounds and Field Results (Apr 8, 2020)


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. To view this archive online or download the slides associated with this seminar, please visit http://www.clu-in.org/conf/tio/DCHWS7_040820/


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 April 9, 2020  n/a