dnapls Articles

  • Bioremediation of DNAPL

    Dense non-aqueous phase liquid (DNAPL) are mixtures of organic compounds that when combined have a specific density greater than water, which has a specific density of 1.00. They sink through water and form a separate liquid phase below the water. DNAPL mixtures can include compounds such as chlorinated solvents, PCB oils, coal tars, and creosotes (complex mixtures consisting of polycyclic ...


  • Portland, Or - Deep, DNAPL remediation

    In 1999, the senior managers of Thermal Remediation Services, Inc (TRS) while working for a former employer, as a subcontractor to AMEC, provided Electrical Resistance Heating (ERH) for VOC-impacted groundwater at a commercial site in Portland, Oregon. The remediation was conducted under the Oregon Department of Environmental Quality (DEQ) Voluntary Cleanup Program. The remedial action objective ...


    By TRS Group, Inc.

  • Deep, DNAPL remediation Portland, OR

    In 1999, the senior managers of TRS Group, Inc (TRS) while working for a former employer, as a subcontractor toAMEC, provided Electrical Resistance Heating (ERH) for VOC-impacted groundwater at a commercial site in Portland,Oregon. The remediation was conducted under the Oregon Department of Environmental Quality (DEQ) Voluntary Cleanup ...


    By TRS Group, Inc.

  • DNAPL in Clay Formation

    PROJECT BACKGROUND At a manufacturing site located in Cookeville, TN, on and offsite soil (tight clays) and groundwater contaminated with chlorinated solvents, were discovered as the result of a Phase I and a Phase II investigation. The client entered the State of Tennessee Voluntary Clean-up Oversight and Assistance Program (VCOAP), which resulted in an informal focused feasibility study to ...


    By REGENESIS

  • DNAPL recovery made easy

    Recovering DNAPL (Dense Non Aqueous Phase Liquid) product is never an easy task. Recovering an extremely viscous DNAPL, such as coal tar, can be a nightmare. With viscosity approaching 20,000 ssu at ambient temperatures, devices that need hydrophobic screens become useless; however, the solution is simple – a PetroXtractor® belt oil skimmer made by Abanaki Corporation, Chagrin Falls, Ohio. ...


    By Abanaki Corporation

  • Successful Biostimulation Treatment of TCE DNAPL

    The challenges posed by the presence of DNAPL are rooted in the unpredictable manner in which it spreads and moves through the subsurface, and the fraction of total contaminant mass it represents in an associated groundwater plume via sorbed, residual and drainable phases (typically greater than 99 percent). Under natural conditions, the dissolution of DNAPL is very slow, allowing groundwater ...


    By Arcadis

  • Extraction well design for DNAPL recovery.

    The potential for downward migration of dense nonaqueous phase liquid (DNAPL) into deeper portions of a saturated hydrogeologic unit has important implications for successful groundwater remediation. Little information has been published regarding the design of extraction wells that allow DNAPL recovery without simultaneously creating a conduit for cross contamination by vertical migration ...


    By Hargis + Associates Inc

  • Combining thermal treatment with MNA at a brownfield DNAPL site

    Abstract A heavily contaminated Brownfields site in New York was remediated and redeveloped using a combination of In-Situ Thermal Desorption and Monitored Natural Attenuation. Four source areas were addressed by the thermal technology, and groundwater beneath the site is undergoing natural attenuation. Approximately 86,000 lbs of volatile organics were extracted and treated on-site. The ...


    By TerraTherm, Inc.

  • Leaks and spills - LNAP and DNAPL detection and clean up

    Any tank can leak. Most leaks can be cleaned up and responsible operators need equipment that does what’s needed. With an ATEX Zone 0 certified interface meter site operators can successfully achieve LNAP and DNAPL detection when monitoring petrochemical sites, tank farms, petrol station forecourts, landfills or remediation sites. If site technicians detect ...


    By Geotech

  • The DNAPL Remediation Challenge: Is There a Case for Source Depletion?

    Untitled Document Executive Summary Introduction Releases of Dense Non-Aqueous Phase Liquids (DNAPLs) at a large number of public ...


  • Large TCE Plume with Extensive DNAPL - Case Study

    ABSTRACT High density sampling program was key to remediation of soil and groundwater impacted by TCE DNAPL at a former industrial site underlain by river deposits and sedimentary bedrock. CHALLENGES Impacted alluvium consisted of poorly sorted, fine to coarse grained sand. The source area was underlain by an aquitard of silt and clayey silt where dense ...

  • Ivey-sol • SPT DNAPL - case study

    Ivey-sol • SPT Technology was successfully used to remediation of a commercial dry-cleaning facility. The subject facility had been in operational since ca. 1971. The DNAPL contamination was comprised of DCE (Dichloroethylene) and TCE (Trichloroethylene) dry-cleaning solvents. Some minor Brominated compounds were also detected. The impacts were limited to the soil and groundwater under the ...


    By Ivey International Inc.

  • Field Screening Methods for the Presence of DNAPL, Superfund Site, southern California

    Characterizing the lateral and vertical extent at a Dense Non Aqueous Phase Liquid (DNAPL) impacted site can prove to be a challenging task. Field methods employed to verify the presence of DNAPL have included the use of down-hole Ultraviolet Induced Florescence technologies, the application of down-hole detection materials such as dye impregnated fabrics, and the installation of monitor wells ...


    By Hargis + Associates Inc

  • Innovative Injection Technique to Treat DNAPL in Granular and Fine Grained Matrices

    High Energy low volume pulses of a water based suspension of a unique treatment material (BOS 100) consisting of granular activated carbon that has been impregnated with metallic iron were employed to remediate DNAPL at a large urban industrial facility. Initially, injections were completed using conventional hydraulic fracturing and large portions of the dissolved phase plume responded to this ...

  • Geophysical Techniques to Locate DNAPLs: Profiles of Federally Funded Projects

    Untitled Document DNAPLs are separate-phase hydrocarbon liquids that are denser than water, such as chlorinated solvents (either as a ...

  • ERH & MPE remediation of DNAPL and LNAPL fort lewis superfund site, Washington

    As the prime contractor, TRS Group, Inc. (TRS) designed and operated Electrical Resistance Heating (ERH) systemsto treat three LNAPL/DNAPL source areas at the Ft. Lewis, East Gate Disposal Yard (EGDY) NPL site. Contaminants ofconcern in NAPL Areas 1, 2 and 3 included chlorinated solvents, primarily trichloroethene (TCE), and POLs (petroleum products, oil and lubricants). Based upon pre- and ...


    By TRS Group, Inc.

  • Thermal treatment of thick peat layers – DNAPL removal and shrinkage

    Abstract A PCE DNAPL source zone was treated using thermal conduction heating combined with multi-phase extraction. Thick peat layers, even when contaminated with PCE DNAPL, were remediated to average soil PCE concentrations of 0.17 mg/kg (99.6% reduction compared to starting levels). This was accomplished in 83 days of heating, by elevating the temperature to the boiling point of water, and ...


    By TerraTherm, Inc.

  • Optimization design based on ensemble surrogate models for DNAPLs-contaminated groundwater remediation

    The optimization design of surfactant-enhanced aquifer remediation for dense non-aqueous phase liquids (DNAPLs)-contaminated groundwater is proposed through integrating simulation and optimization models. Many studies have demonstrated that the surrogate model is an effective tool for building a bridge between simulation and optimization models. In this paper, the simulation model was first ...


    By IWA Publishing

  • DNAPL removal action alameda navy base, Alameda California

    TRS Group, Inc (TRS), as a subcontractor to Shaw Environmental & Infrastructure, provided a Six Phase Heating(SPH) remediation of Plume 4-2 at the Alameda Navy Base. Plume 4-2 soil and groundwater has been impacted by aDNAPL consisting of vinyl chloride, DCA, DCE, TCA, TCE, and PCE. Also present were the daughter products of thesecompounds. At the Alameda Navy Base, these contaminants are ...


    By TRS Group, Inc.

  • In Situ Thermal Remediation of DNAPL and LNAPL Using Resistance Heating

    Electrical resistance heating (ERH) is an in situ thermal treatment for soil and groundwater remediation that can reduce the time to clean up volatile organic compounds (VOCs) from years to months. The technology is now mature enough to provide site owners with both performance and financial certainty in their site-closure process. The ability of the technology to remediate soil and groundwater ...


    By TRS Group, Inc.

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