in-situ chemical reduction Articles

  • 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) 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 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 ...


  • 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

  • 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

  • In situ Chemical Oxidation: An Innovative Groundwater Remediation Technology

    A promising new technology, in situ Chemical Oxidation (ISCO), has the potential to supplant the more widely used pump-and-treat groundwater remediation technology by destroying groundwater contamination in situ (in place). ISCO is the process of oxidizing contaminants in the groundwater and soil by injecting water containing high concentrations of an oxidant to the site of the contamination. ...


    By AECOM

  • 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 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, ...


  • 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

  • Ex Situ Physical/Chemical Treatment for Soil, Sediment, and Sludge

    The main advantage of ex situ treatment is that it generally requires shorter time periods than in situ treatment, and there is more certainty about the uniformity of treatment because of the ability to homogenize, screen, and continuously mix the soil. Ex situ treatment, however, requires excavation of soils, leading to increased costs and engineering for equipment, possible permitting, and ...

  • 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

  • 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 ...


  • On-Line Biomonitors Used as a Tool for Toxicity Reduction Evaluation of in Situ Groundwater Remediation Techniques

    AbstractSuccess of groundwater remediation is typically controlled via snapshot analysis of selected chemical substances or physical parameters. Biological parameters, i.e. ecotoxicological assays, are rarely employed. Hence the aim of the study was to develop a bioassay tool, which allows an on line monitoring of contaminated groundwater, as well as a toxicity reduction evaluation (TRE) of ...

  • Oxidation v. reduction: how to decide?

    Is in-situ chemical oxidation (ISCO) or in-situ chemical reduction (ISCR) the best option for your site? What factors should be considered to make such a decision? Many chlorinated hydrocarbon compounds (CHCs) can be degraded via oxidative or reductive processes. Accordingly, various ISCO technologies using oxidizing agents such as hydrogen peroxide (Fenton’s chemistry), permanganate, ozone or ...


  • 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

  • In-situ bioremediation technology tested in Northern Italy

    In-situ groundwater treatment is experiencing rapid growth at contaminated sites, so consultants, environmental engineers, hydrogeologists, and regulators must not only stay abreast of emerging remedies, they must strive to objectively select the most natural and cost-effective solutions available. The Italian natural philosopher and mathematician, Galileo Galilei (1564-1642) wrote that ...


  • In-Situ Anaerobic Remediation of Perchlorate-Impacted Soils

    AbstractARCADIS is currently leading the development, evaluation, and selection of a final groundwater remedy for a 94-acre manufacturing facility in the western U.S. This facility has produced small explosives and vehicular safety products since 1957. As a result of historic operations, soil and groundwater at the site have been impacted by perchlorate. To date, remediation efforts have been ...


    By Arcadis

  • Reductive Biotransformation of Explosives Compounds in Groundwater

    Untitled Document ABSTRACT: Earth Tech Inc. has successfully completed two bench-scale studies demonstrating the treatment of explosives contaminated groundwater by ...


    By REGENESIS

Need help finding the right suppliers? Try XPRT Sourcing. Let the XPRTs do the work for you