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IN-SITU THERMAL REMEDIATION OF TRICHLOROETHYLENE DNAPL FROM GLACIALLY DEPOSITED CLAY-SILT DIAMICTON AND SUBSEQUENT REMEDIAL PERFORMANCE ASSESSMENT
Raetz, R.M. | Great Lakes Environmental Remediation & Redevelopment Conference, 16-18 October, Lansing, MI, 77 slides, 2019
A former metal plating facility contaminated 23,700 y3 of glacial clay-till diamicton with DNAPL solvents in an onsite septic drain-field to a depth of 34 ft. An in situ electro-thermal dynamic stripping process (ET-DSPTM) that integrated with multi-phase extraction (MPE) and surface treatment was applied to reduce TCE concentrations, which ranged from 34,000-17,000,000 µg/kg in soil throughout impacted regions of the site. Thermal treatment resulted in removal of more than 1,500 gallons of TCE after 245 days of active operations. The ES-DSP technology applied 168 electrodes in 84 locations, integrated with 55 MPE wells uniformly spaced throughout the site. A vacuum of ~10 inches mercury was achieved at each MPE well throughout the operation to affect a vapor flow of >600 ft3/min, while also integrated with groundwater recovery to produce 6 gal/min. DNAPL separation, carbon system steam regeneration and sacrificial vapor phase carbon polish was integrated with groundwater air stripping and liquid phase carbon treatment. Digital temperature monitoring sensors were vertically placed throughout the subsurface to assess TCE co-boiling temperatures of 70-100°C resulting from the ET-DSP process. Over 12 months, 1,648 gal NAPL was recovered for an estimated 84-94% NAPL reduction. The presentation includes remedial design, construction, operation, and post-remediation sampling results. https://www.michigan.gov/documents/egle/egle-tou-GLERRCpresentation-In-SituThermalRemediationTCE-DNAPL-Raetz_670756_7.pdf
A former metal plating facility contaminated 23,700 y3 of glacial clay-till diamicton with DNAPL solvents in an onsite septic drain-field to a depth of 34 ft. An in situ electro-thermal dynamic stripping process (ET-DSPTM) that integrated with multi-phase extraction (MPE) and surface treatment was applied to reduce TCE concentrations, which ranged from 34,000-17,000,000 µg/kg in soil throughout impacted regions of the site. Thermal treatment resulted in removal of more than 1,500 gallons of TCE after 245 days of active operations. The ES-DSP technology applied 168 electrodes in 84 locations, integrated with 55 MPE wells uniformly spaced throughout the site. A vacuum of ~10 inches mercury was achieved at each MPE well throughout the operation to affect a vapor flow of >600 ft3/min, while also integrated with groundwater recovery to produce 6 gal/min. DNAPL separation, carbon system steam regeneration and sacrificial vapor phase carbon polish was integrated with groundwater air stripping and liquid phase carbon treatment. Digital temperature monitoring sensors were vertically placed throughout the subsurface to assess TCE co-boiling temperatures of 70-100°C resulting from the ET-DSP process. Over 12 months, 1,648 gal NAPL was recovered for an estimated 84-94% NAPL reduction. The presentation includes remedial design, construction, operation, and post-remediation sampling results. https://www.michigan.gov/documents/egle/egle-tou-GLERRCpresentation-In-S
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