in-situ reduction Articles

  • Treatment of Explosives-Contaminated Groundwater by In Situ Cometabolic Reduction

    Untitled Document ABSTRACT: Earth Tech Inc. has completed the first field-scale demonstration of in situ explosives-contaminated groundwater treatment by cometabolic ...


    By REGENESIS

  • Successful in situ reductive biological treatment of high explosives

    Groundwater impacted by high explosives (HE) such as RDX and TNT pose great challenges for environmental remediation. The properties of HE tend to lead to the selection of groundwater extraction and treatment while causing above ground treatment processes to be expensive to operate. An interim corrective measure (ICM) pilot test of in-situ reductive biological treatment is ongoing at the U.S. ...


    By RNAS Remediation Products

  • Enhanced Reductive Dechlorination (ERD) and In Situ Chemical Reduction (ISCR) using EHC®

    CH2M HillUnited States Marine Corps Site, North Carolina Summary Site groundwater was impacted with chlorinated volatile organic compounds (CVOCs) at concentrations as high as 80,000 ppb. A total of 24,100 lbs of EHC was injected into areas of elevated CVOC concentration to yield enhanced in situ chemical reduction (ISCR). Six months after the EHC injection, TCA levels had decreased ...


  • In-situ chemical reduction (ISCR) versus emulsified oils: how to decide?

    Many industry practitioners, such as environmental consulting and engineering firms, are seeking topical decision-making criteria for their options when remediating impacted groundwater.  'Few, if any, of us are experts in the myriad fields of science associated with applied environmental biotechnology. As such, technology end-users, and vendors alike, are often confused and frustrated with ...


  • Reduction of concentrated nitrate by using in situ synthesized zero-valent copper

    Although zero-valent iron represents a promising approach for reduction of nitrate (NO3−) in water, its application in concentrated nitrate is limited by surface passivation. In this study, an alternative approach using in situ synthesized zero-valent copper (Cu0) produced by borohydride (NaBH4) was investigated. Complete reduction was observed ...


    By IWA Publishing

  • In Situ Chemical Reduction (ISCR) Technologies: Significance of Low Eh Reactions

    As used herein, ISCR describes the synergistic effect of stimulated biological oxygen consumption (via degradation of added organic carbon sources), direct chemical reduction with reduced metals, and the corresponding enhanced thermodynamic decomposition reactions that are realized at the lowered redox (Eh) conditions. These combined effects are therefore characteristic for technologies that ...


  • 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

  • In Situ Chemical Reduction (ISCR) for removal of persistent pesticides; focus on kepone in tropical soils

    The global use of organochlorine pesticides (OCPs) such as Kepone, Lindane, DDT, Dieldrin, Chlordane, and Toxaphene has resulted in long-term soil impacts at many sites. Given the potential risks to human health and the environment, some OCP-impacted sites require treatment. In certain cases, the “dig-and-dump” approach is not practical due to magnitude of the problem, access issues, ...


  • Earth Tech Successfully Demonstrates in situ Reductive Treatment of Groundwater Contaminated with Explosives and Nitrate Using HRC®

    Earth Tech has recently completed the first field-scale demonstration of in situ treatment of explosives-contaminated groundwater using Hydrogen Release Compound (HRC®). Explosives and nitrate contamination in groundwater are widespread at military facilities worldwide and, until now, have been difficult and expensive to address. The study, completed in January 2001, was performed by Earth ...


    By REGENESIS

  • In situ treatment of a complex mix of chlorinated solvents: anaerobic reductive dehalogenation after chemical oxidation

    Treatment of chlorinated organic compounds has been ongoing at this New England facility (Site) for over 15 years. The extraction and above ground treatment system for groundwater containing tetrachloroethene (PCE), trichloroethene (TCE), 1,1,1-trichloroethane (1,1,1-TCA) and other chlorinated organic compounds has been running since September 1992. The full-scale remedy of in-situ chemical ...


    By RNAS Remediation Products

  • Stabilizing the NAPL Threat: In-situ biogeochemical stabilization and flux reduction using catalyzed permanganate

    Nature of the problemNon-aqueous phase liquids (NAPLs) and other hydrocarbon residuals can represent long-term sources of groundwater contaminants. Excavation and disposal often represent the most rapid and effective means of removing these source materials from the environment. However, such an approach is not always physically possible, hence in-situ source area management strategies are ...


  • Hydrogen Equivalents: Comparison of Simple Electron Donors to EHC In-Situ Chemical Reduction (ISCR) Reagents

    Biodegradation via reductive dechlorination processes occurs when microbes directly remove chlorine atoms from a chemical in order to derive energy from other organic compounds. This occurs under reducing, anaerobic conditions. A more effective remedial strategy, however, entails in situ chemical reduction (ISCR) using EHC as the reductant. As described herein, EHC™ is the patented combination of ...


  • Treatment of a mixed CVOC and cr contaminated site using in situ chemical reduction (ISCR) and Stimulated Biotic Mineralization

    The implementation of efficient and cost-effective remedial solutions in the clean-up of impacted properties is paramount in returning brownfields and other impacted properties to viable use in the face of the recent real estate market declines. Historical site use of the Cleveland Flats project area included: a manufactured gas plant (circa. 1850), trucking terminal, & plating operations. As ...


  • In situ chemical reduction (ISCR) of 1, 2 - DCA in groundwater confidential industrial site, Taiwan, ROC

    Adventus" ISCR technology employed, EHC®, a patented combination of hydrophilic, controlled-release solid carbon and zero valent iron (ZVI) and/or other reduced metal particles. EHC technology causes complete destruction of organic contaminants through two primary mechanisms: (i) chemical reduction and (ii) enhanced biological degradation. This unique combination stimulates ISCR of otherwise ...


  • In situ identification of vehicle engine inertia properties

    A direct system identification method for vehicle engine rigid body inertia properties based on in situ measurements is presented in this work. One of the advantages of this method is the use of acceleration response measurements obtained from standard NVH tests performed on a vehicle. Since there is no need to separate the engine, there will be a considerable reduction in time required for ...


    By Inderscience Publishers

  • 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

  • In Situ Dechlorination of TCE during Aquifer Heating

    Laboratory and field efforts were undertaken to examine trichloroethene (TCE) dechlorination as a function of temperature as an aquifer is heated to temperatures approaching boiling. Experiments were conducted using sediment samples and during electrical resistance heating (ERH) treatment at the East Gate Disposal Yard (Fort Lewis, Washington), which contains nonaqueous phase TCE and hydrocarbon ...


    By TRS Group, Inc.

  • Feasibility study of in-situ bioremediation for nitrobenzene-contaminated groundwater

    Although many studies have simulated in-situ bioremediation of contaminated groundwater, most of them have not considered hydrochemical conditions and indigenous microorganisms, thus potentially rendering results inapplicable to actual in-situ groundwater bioremediation projects. This study focused on a nitrobenzene-contaminated groundwater site located in Jilin City, China. The actual ...


    By IWA Publishing

  • 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

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