dual phase extraction Articles

  • Explosion proof high vacuum dual-phase extraction

    This an integrated explosion proof system for the simultaneous extraction of soil vapour and groundwater at potentially explosive concentrations. With a pH of 1 to 2, the groundwater was extremely aggresive and required neutralisation.The system included a double header system (high vacuum and low vacuum) enabling simultaneous extraction from small diameter dual-phase extraction lances and larger ...


  • Lessons Learned from a Dual-Phase Extraction Field Application

    ABSTRACT A field-scale Dual-Phase Extraction (DPE) system was installed and operated at the Pinellas Science, Technology, and Research (STAR) Center, formerly the U.S. Department of Energy (DOE) Pinellas Plant, in Largo, Florida, from August 1997 through September 1999. The goal of applying the DPE system was to enhance the pump-and-treat remediation of volatile organic compounds (VOCs) ...


    By Weston Solutions, Inc

  • Bioremediation Following Dual Phase Extraction Saves Hundreds of Thousands of Dollars

    CL-Out® bioremediation was implemented at a dry cleaners site in Houston, Texas to reduce concentrations of residual PCE and other chlorinated solvents in groundwater following dual phase vacuum extraction.  After application of CL-Out® bioremediation the chlorinated solvent concentrations were reduced by 98% to 99% in less than 90 days.  The switch saved their client ...


    By CL Solutions, LLC

  • Ultrasonic density measurement of uranium loaded organic phase in solvent extraction process

    The application of ultrasound technique in density determination of uranium loaded organic phase in solvent extraction can provide a unique solution for online density monitoring of process streams. Earlier various authors have investigated the density measurement of liquid by single ultrasound frequency. In general standard reference liquid (having low viscosity and density) is used for ...


    By Inderscience Publishers

  • Two Detector Solution to Analyzing Sulfur

    Sulfur compounds are reactive, corrosive to pipes, and destructive to catalysts in petroleum refineries. Sulfur emission are strictly regulated globally. When released into the atmosphere sulfur dioxide converts to sulfuric acid resulting in adverse effects on human health and the environment. Sulfur detection is found useful in many other industries; therefore, detection of sulfur compounds in ...


    By Restek Corporation

  • Significant Benefits of Augmenting an Extractive Remedial System with RegenOx™

    Recently, in the United Kingdom, a combined strategy was implemented to synergistically increase the treatment rate and efficiency of subsurface remediation while also reaching an inflexible remedial deadline cost-effectively. Central to this was the novel exploitation of a feature of RegenOx that was initially designed for an alternative purpose. The remedial strategy is now being widely used on ...


    By REGENESIS

  • Tetrachloroethylene multiphase extraction (MPE) remediation case study 2007

    Project Description An active industrial facility in the San Fernando Valley north of Los Angeles was impacted by tetrachloroethylene (PCE) degreasing operations. A phased approach to multiphase extraction (MPE) remediation was employed; Phase I implemented high contaminant mass removal rates with very high VOC vapor concentrations, typically observed in the steep decay portion of influent ...

  • In Situ Physical/Chemical Treatment for Ground Water and Leachate

    The main advantage of in situ treatments is that they allow ground water to be treated without being brought to the surface, resulting in significant cost savings. In situ processes, however, generally require longer time periods, and there is less certainty about the uniformity of treatment because of the variability in aquifer characteristics and because the efficacy of the process is more ...

  • In-situ Thermal Remediation Under an Apartment Building

    This paper presents the implementation and results of ET-DSP, an in-situ electrical soil heating technology, in combination with high vacuum dual phase extraction, to achieve the removal of vapour pressure sensitive BTEX compounds from under an occupied residential apartment building. Operating within several engineering, environmental, and safety constraints, a design was developed in order to ...


    By McMillan-McGee Corp.

  • A novel hysteresis switching strategy for harmonic compensation

    A simple and novel control technique for harmonic current compensation is presented. For each 60° duration of line cycle, the three-phase controlled bridge can be considered as dual buck, buck and boost, or dual boost configuration depending on the grid voltage and injected current polarities, and that only two switches are controlled at high frequency at any instant of time. A three-phase diode ...


    By Inderscience Publishers

  • Analysis of Multi-Pesticide Residues in Vegetables, Food, and Fruits by SPE/GC-MS

    Cleanup of matrices is the first, the most important, and the most critical step for both broad-spectrum screening and accurate determination of pesticides and their metabolites in vegetables,meats, drinks and fruits. In most cases, solid phase extraction (SPE) methods are used to clean up the extracts before the GC-MS analysis. The ideal SPE material(s) should remove the greatest number of food ...


    By Sigma-Aldrich Co., LLC

  • Common Treatment Technologies for Fuels in Ground Water, Surface Water, and Leachate

    It may be necessary to know other subsurface information to remediate fuels in ground water. Treatability testing to characterize contaminant biodegradability and nutrient content may be needed for any biodegradation technology. A subsurface geologic characterization would be particularly important to characterize the migration of NAPLs. Recovery tests are usually necessary to design a ...

  • HRC® Reduces Chlorinated Hydrocarbon Contamination in a Complicated Geological Setting

    CASE SUMMARY Textile Facility, Northern France A subsurface plume of mixed chlorinated solvents developed as the result of historical operations at a textiles facility in Northern France. The plume was approximately 1,000 square meters in size. The complicated geology consisted of a gravelly silt (highly contaminated) overlying a silty sand (medium contamination) ...


    By REGENESIS

  • Achieving exemplary compliance case study

    Challenge: A major integrated oil company retained the services of Antea Group to manage environmental liability at a bulk storage and distribution facility that supplies gasoline, diesel fuel and other refined petroleum product to Minnesota, Iowa and Wisconsin.  The property presented a series of unique challenges including multiple LNAPL plumes, ...


    By Antea Group - USA

  • Full steam ahead

    RemedX managing director Richard Croft explains why thermal remediation techniques are good value even at a time of recession. In-situ thermal treatments of soils are usually applied in conjunction with other technologies. The process involves heating contaminated soils, rock and groundwater to exploit resulting physical and chemical effects on the contaminants present. To understand the ...


    By Newzeye Ltd

  • Chlorinated solvents: methylene chloride and TCE

    Introduction This paper presents the results of a scaled and phased approach to source remediation of high concentrations of recalcitrant chlorinated solvent compounds via soil vapor extraction (SVE) and vapor treatment at a Site in Southern California. Phase I began with refrigerated condensation (C3) in order to achieve high mass removal rates to reduce lifecycle costs and time ...

  • Case study: Monroe, Connecticut, USA

    Monroe Facts: former heating oil terminal from the mid-1950's to the late 1970s No. 2 fuel oil was stored at the site Multiple releases occurred over time Site and surrounding area are wetlands, with the former terminal area elevated with fill material for commercial use Irregular fill consisting of sand, silt, gravel and boulders with some ...


    By Ivey International Inc.

  • Emergency response and remediation of a petrol leak: petrol filling station

    Project: Emergency Fuel Leak at an Operational Petrol Station Client: Franchised petrol station operator Services: Emergency response/leak management, regulator negotiation, site investigation, remediation and verification Summary: Responsive, pragmatic advice and robust regulator negotiations aided rapid characterisation ...

  • EEI`s Efforts in Helping to Re-build Hurricanes Katrina & Rita Affected Zones

    Untitled Document Dear Environmental Professionals, Hurricanes Katrina & Rita ...


    By Enviro-Equipment, Inc.

  • Refinery remediation: fuel recovery and recycling

    Introduction The site is a former refinery that occupied approximately 64 acres of land in West Texas. Refinery operations produced all grades of gasoline, tractor fuels, diesel, distillate products, and fuel oils and operated between 1939 and 1954. As a result of past waste management practices, releases to soils and ultimately ground water occurred, resulting in the formation of a ...

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