solvent monitoring Articles

  • Single solvent

    The Customer'This company is a leading manufacturer ot polvrner ba^ed textiles, which are used in the medical and pharmaceutical industries. The ProcessThe customer has a single-solvent process that uses MEK. If this process has a leak, the leakage is diverted into an oxidizer for destruction. Leakage levels must be kept BELOW 5% LFL to optimize the process, save product ...

  • In Situ Bioremediation of Chlorinated Solvents

    ABSTRACT: In situ bioremediation is ongoing at a former manufacturing facility in Portland, Oregon.  Shallow groundwater at the site was impacted by chlorinated solvents, primarily trichloroethene and degradation products cis-1,2-dichloroethene and vinyl chloride.  In situ chemical oxidation treatment was completed in 2003 via the injection of sodium permanganate in source ...


    By EOS Remediation, LLC

  • Soil & Groundwater treatment of Chlorinated Solvents

    Project: Treated 675 Cubic Yards of Chlorinated Contaminated Soil and Groundwater Client: Operating Dry Cleaners Location: Lexington, Kentucky Scope of work: In-Situ Bioremediation Project cost: $7,575 (Included earthmoving, labor, and all bioremediation materials) Source of ...

  • Enhanced Bioremediation of Chlorinated Solvents (PDF)

    Enhanced in situ bioremediation of chlorinated solvents in groundwater has been successfully demonstrated at many sites by supplying lactic acid as an electron donor. The source of lactate for these successful pilot tests is Hydrogen Release Compound (HRC), a polylactate ester specially formulated for slow release of lactic acid upon hydration. HRC has been delivered to chlorinated ...


    By REGENESIS

  • Solvent-free oil-in-water analysis

    Non-ionic surfactants can homogenize oily, produced water samples, creating optically clear microemulsions that are ideal for fluorescence measurements [1]. The use of surfactants to reduce fouling and improve the performance of on-line, fluorescence-based, oil-in-water monitors has been reported previously [2,3]. This paper describes the use of surfactants to prepare discrete water samples ...

  • In Situ Bioremediation of Chlorinated Solvents: A Case Study

    In situ bioremediation is ongoing at a former manufacturing facility in Portland, Oregon. Shallow groundwater at the site was impacted by chlorinated solvents, primarily trichloroethene and degradation products cis-1,2-dichloroethene and vinyl chloride. In situ chemical oxidation treatment was completed in 2003 via the injection of sodium permanganate in source areas. Subsequent stimulation of in ...


    By EOS Remediation, LLC

  • Abiotic and Biotic Pathways in Chlorinated Solvent Natural Attenuation

    ABSTRACT: Abiotic degradative pathways are often overlooked when evaluating natural attenuation at chlorinated solvent sites. Yet, at many sites, significant degradation of parent compounds such as 1,1,1-TCA, PCE and TCE is observed without the corresponding accumulation of daughter products, a sure indication of abiotic reactions. The problems in integrating abiotic processes into MNA are how to ...


  • Scenarios evaluation tool for chlorinated solvent MNA

    Over the past three decades, much progress has been made in the remediation of chlorinated solvents from the subsurface. Yet these pervasive contaminants continue to present a significant challenge to the U.S. Department of Energy (DOE), other federal agencies, and other public and private organizations. The physical and chemical properties of chlorinated solvents make it difficult to rapidly ...


  • Software Provides Insight into Solvent Recovery Operation

    When World Color Press, Dyersburg, TN, decided to replace its outdated computerized supervisory control system for its large solvent recovery operation, it turned to AMCEC Inc., Lisle, IL. World Color Press wanted a system that would provide uncomplicated screens and flexible graphic importing. It also wanted to avoid long hours of training. A solution was found in an object-based automation ...

  • Enhanced In Situ Bioremediation of Chlorinated Solvents (PDF)

    Anaerobic enhancement of a shallow confined silty sand aquifer has resulted in a substantial biodegradation of a dissolved Tetrachloroethene (PCE) plume at a former metal finishing facility in Secaucus, New Jersey. The injection of a time-release hydrogen compound (HRC™) rapidly converted ambient aquifer aerobic conditions to anaerobic, and maintained such conditions throughout the 6-month ...


    By REGENESIS

  • Principles and practices of enhanced anaerobic bioremediation of chlorinated solvents

    PROBLEM STATEMENTThe Department of Defense (DoD) has identified hundreds of sites where groundwater is contaminated with chlorinated solvents; these represent one of the DoD’s largest remediation liabilities. In addition to their use in many industrial processes, chlorinated solvents have historically been used for cleaning and degreasing such diverse products as aircraft engines, automobile ...


    By RNAS Remediation Products

  • Reduction in Solvents for Cleaning: Amcor Packaging (Australia)

    Background Amcor Cartons, a manufacturer of folding cartons and paperboard packaging is a 13 million dollar operation employing 60 staff. In keeping with Amcor Cartons’s commitment to respond to customer needs through the application of the highest technology, advantage was taken of the latest available technology when deciding to upgrade their printing press. After installing a new ...


  • Passively Enhanced In-Situ Biodegradation of Chlorinated Solvents

    Harding Lawson Associates (HLA) conducted a field demonstration to evaluate in situ enhanced anaerobic biodegradation of chlorinated solvents using Hydrogen Release Compound (HRC). The technology is designed to enhance the natural biodegradation process for a more rapid and complete degradation of the organic contaminants to non-toxic compounds (e.g., ethylene). This paper presents the results ...


    By REGENESIS

  • Rapid in-situ bioremediation of solvents by abiotic and biotic mechanisms

    A combined abiotic/biotic field pilot study was performed at an industrial site with high concentrations of chlorinated solvents in a fractured bedrock groundwater system. The primary groundwater contaminants consist of 1,1,1-trichloroethane (TCA) and related degradation products, including 1,1-dichloroethane (DCA), 1,1-dichloroethene (DCE), chloroethane (CA), and vinyl chloride (VC). The pilot ...


    By RNAS Remediation Products

  • Passively Enhanced in Situ Biodegradation of Chlorinated Solvents.

    INTRODUCTION Harding Lawson Associates (HLA) conducted a field demonstration to evaluate in situ enhanced anaerobic biodegradation of chlorinated solvents using Hydrogen Release Compound (HRC). The technology is designed to enhance the natural biodegradation process for a more rapid and complete degradation of the organic contaminants to non-toxic compounds (e.g., ethylene). This paper presents ...


    By REGENESIS

  • How To: Bioremediate chlorinated solvents without accumulating metabolites

    Chlorinated volatile organic compounds (CVOCs) such as tetrachloroethylene (PCE) and trichloroethylene (TCE), commonly used as dry cleaning solvents and degreasers, pose an ongoing threat to human health and wildlife when spilled into groundwater. Through the injection of bioremediation products into the impacted groundwater, the chlorine atoms can be removed from these compounds in situ. ...


  • Historical and Retrospective Survey of Monitored Natural Attenuation Line of Inquiry Supporting Monitored Natural Attenuation and Enhanced Passive Remediation of Chlorinated Solvents

    Overview The Department of Energy (DOE) is sponsoring an initiative to facilitate efficient, effective and responsible use of Monitored Natural Attenuation (MNA) and Enhanced Passive Remediation (EPR) for chlorinated solvents. This Office of Environmental Management (EM) “Alternative Project,” focuses on providing scientific and policy support for MNA/EPR. A broadly representative working group ...


  • Multiyear Temporal Changes in Chlorinated Solvent Concentrations at 23 Monitored Natural Attenuation Sites

    Introduction There is an increasing interest in predicting how long it will take natural attenuation processes to remediate groundwater plumes. The U.S Environmental Protection Agency (USEPA) Monitored Natural Attenuation (MNA) Directive (USEPA 1999) specifies that MNA relies on “ . . . a variety of physical, chemical, or biological processes that, under favorable conditions, act without human ...


  • 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

  • Long-Term Sustainability of Reductive Dechlorination Reactions at Chlorinated Solvents Sites

    The sustainability of biodegradation reactions is of interest at Type 1 chlorinated solvent sites where monitored natural attenuation is being considered as a remedial alternative. Type 1 chlorinated solvent sites are sites where anthropogenic electron donors (such as landfill leachate or fermentable organics in the waste materials) exist with dissolved chlorinated solvents, resulting in ...


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