dnapl recovery pump Articles

  • 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

  • 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.

  • Case study: in-situ surfactant enhanced DNAPL recovery pilot project-refinery site montreal canada

    Project Facts Active chemical refinery (20 acre site) Several DNAPL (chlorobenzene and dichlorobenzenes) and BTEX stored on-site Multiple DNAPL and BTEX spill events reported over a site history extending back to the 1950's. DNAPL and BTEX impacts to both the local soil and groundwater covering an 8 acre (+) area Risk: potential risk for ...


    By Ivey International Inc.

  • Assessment, Field Testing, and Conceptual Design for Managing Dense Non-Aqueous Phase Liquids (DNAPLs) at a Superfund Site

    AbstractDense non-aqueous phase liquids (DNAPL) greatly complicate groundwater remediation because the heavy DNAPL will sink and follow topographic lows within an aquifer system, and because DNAPL is difficult to extract using conventional pumping methods. These problems are now ...


  • Liberating contaminants for easy recovery

    The number one challenge associated with most site remediation designs and methodologies is that 90-95 per cent of all environmental contaminants are present in an adsorbed phase onto soil and bedrock surfaces within both saturated and unsaturated zones. Contaminants, including hydrocarbons (LNAPL), chlorinates (DNAPL) and heavy metals, are sorbed onto the substrates and so have reduced mobility ...


    By Ivey International Inc.

  • Free-Product Recovery Methods and Issues

    During my 33 years in the environmental field, I have been involved in a lot of sites with free product.  In the 1980’s light non-aqueous phase liquids (LNAPL) such as gasoline were removed by the following methods: Bailing with a hand bailer from a well Pumping with a 2 pump system (depression pump and product pump) Pumping with a total fluids pump and separating ...


    By Enviro-Equipment, Inc.

  • Case study: surfactant enhanced HVDPE remediation of petroleum contaminated soil, bedrock and groundwater

    Recalcitrant petroleum product residuals sorbed in fine grain soils and fractured bedrock Persistent concentrations in groundwater after 12 years of remediation - including pumping, HVDPE Obtained regulatory approval for Ivey-sol surfactant application in spring 2009 Pilot Test Approach - Focused Short-Term Surfactant Injection/Extraction to Maximize Recovery ...


    By Ivey International Inc.

  • Consideration of the Effects of Remediation Technologies on Natural Attenuation.

    ABSTRACT: We have long understood and continue to improve our understanding of the geochemical conditions that favor biodegradation of petroleum hydrocarbons. Over the last several years our understanding of the conditions that are necessary for and/or promote reductive dechlorination of chlorinated hydrocarbons has improved substantially. Over this time in situ remediation technologies have ...


    By REGENESIS

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