dechlorination Articles

  • The Use Of UV For Dechlorination

    For many years chemical disinfection techniques have been used to provide microbiologically pure water for industrial and domestic use. Free chlorine, typically introduced by municipal water treatment plants in gaseous form, has been employed for many decades as a primary oxidising agent for the control of microbiological growth. Free chlorine can also be introduced through the injection of ...

  • Advancing the Science of Enhanced Reductive Dechlorination

    Make the ultimate upgrade to Tersus Environmental, featuring EDS-ER™ combined with the power of Hydrogen Gas inFusion, the next evolution in Enhanced Reductive Dechlorination. There are a number of different hydrogen donors commercially available for enhanced reductive dechlorination projects. In evaluating your options, electron donor source cost can be misleading and it is important that ...


    By Tersus Environmental, LLC

  • Dechlorination of Chlorophenols Using Magnesium-Palladium Bimetallic System

    ABSTRACT94% removal of PCP (10 mg l-1 initial concentration) was achieved by using 3.75 g l-1 Mgo and 25 mg l-1 K2PdCl6 in presence of 175 mM acetic acid in 1h reaction time. Dechlorination of PCP was found to be sequential and phenol was identified as the end product along with accumulation of trace concentrations of tetra and trichlorophenols. Pd/Mgo reaction carried out in the absence of ...

  • 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.

  • A Bioavailable Ferric Iron Assay and Relevance to Reductive Dechlorination

    Untitled Document ABSTRACT: Reductive dechlorination of chlorinated organic compounds can be promoted through the addition of electron donors to the subsurface. The ...


    By REGENESIS

  • Comparison of Reducing Agents for Dechlorination in a Simulated Aquifer (PDF)

    A simulated aquifer system (Aquifer Simulation Vessel – ASV) was used to study the efficacy of various reducing agents to assist microbial dechlorination. The soil samples are homogenized and the soil is packed into 6.0-foot long tubes with an internal diameter of 5.75 inches. Flow rates can be calibrated for flow at 0.1 to 2.0 feet/day. The system has a volume of 2025.44 in3.  A solution of ...


    By REGENESIS

  • Alternative Techniques to Increase the Dechlorination Kinetics of Organic Chloramines

     ABSTRACT Organic chloramines are a potential source of aquatic toxicity. Destruction of organic chloramines by dechlorination with sulfur dioxide is possible. However, the reaction proceeds slowly. The goal of this study was to investigate reaction enhancements to accelerate the dechlorination of organic chloramines. The dechlorination enhancements investigated were 1. Aeration mixing, ...

  • 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 ...


  • Enhanced CAH Dechlorination using Slow and Fast Releasing Polylactate Esters

    In the mid-1990s, CDM began aggressive discussions with the regulatory agency to reduce regulatory and operational requirements at two sites in Santa Clara, CA -- TR W Microwave and Anadite Santa Clara. Both sites began usingtetrachloroethene (PCE) and trichloroethene (TCE) in manufacturing activities in the mid-1960s. Soil and groundwater were contaminated with PCE, TCE, and daughter products ...


    By REGENESIS

  • Results of the Application of Enhanced Reductive Dechlorination of Chlorinated Organics at Eight Sites (PDF)

    Enhanced reductive dechlorination is becoming more widely evaluated as a technology for the remediation of chlorinated organic compounds. The performance of this technology as reported in the literature, is often quite variable, making it difficult to evaluate the applicability of the technology. CH2M HILL has been involved in the application of this technology at several sites over the past few ...


    By REGENESIS

  • Laboratory Studies Using edible oils to support reductive dechlorination

    In laboratory microcosm tests, single additions of corn oil, beef tallow, melted corn oil margarine, coconut oil, corn oil, soybean oil, or partially hydrogenated soybean oil supported complete reductive dechlorination of perchloroethene (PCE) or trichloroethene (TCE) to ethene when a dechlorinating population was present. TOC production from the edible oils continued for up to 200 days. More ...


    By Terra Systems, Inc. (TSI)

  • Enhanced CAH Dechlorination Using Slow- and Fast-Releasing Polylactate Esters (PDF)

    This paper compares the results of two separate field tests using slow and fast releasing polylactate esters to remediate chlorinated aliphatic hydrocarbon (CAH) contamination in groundwater by enhancing reductive dechlorination. The two polylactate esters generate molecular hydrogen in groundwater at different rates ...


    By REGENESIS

  • Reductive Dechlorination Using HRC Reduces VOCs Towards MCLs

    Site Summary As part of the EPA Superfund Innovative Technology Evaluation (SITE) program, a pilot-scale study was conducted to determine the effectiveness of using HRC to reduce TCE concentrations in groundwater at the Fisherville Mill site in Grafton, MA. The Fisherville site is characterized by TCE contamination in a sand and gravel aquifer and is considered a brownfield site. Prior to HRC ...


    By REGENESIS

  • Trimetallic Pd/Fe/Al particles for catalytic dechlorination of chlorinated organic contaminants

    Zero-valent aluminum based trimetallic particles comprising a combination of catalytically effective amounts (1 wt%) of palladium and zero-valent iron on the aluminum surface were synthesized and tested for the dechlorination of chlorinated methanes in batch reactors. XRD analysis indicated the trimetallic particles present in zero-valent form of all three components. Trimetallic Pd/Fe/Al ...


    By IWA Publishing

  • Field application of biogeochemical reductive dechlorination by permeable reactive barrier

    Biogeochemical reductive dechlorination (BiRD) uses biotically generated iron sulphide minerals to abiotically reduce chlorinated aliphatic hydrocarbons (CAH). BiRD was applied by permeable reactive barrier (PRB) at Dover Air Force Base, the first time this approach was tested in the field. Iron sulphide minerals were generated in trenches filled with iron rich sand (iron), mulch (organic), ...


    By Inderscience Publishers

  • The Effects of pH on Enhanced Reductive Dechlorination: Growth vs. Activity

    This past May at the International Symposium on In-Situ and On-Site Bioremediation sponsored by Battelle, I attended a session entitled “Microbial Ecology of Reductive Dechlorination and the pH Impact.” The presentation contained fascinating information about a seemingly well understood parameter, pH. Although a relatively simple parameter, the effect of pH on enhanced reductive dechlorination ...


    By REGENESIS

  • Evaluating alkaline microcapsules for pH control and reductive dechlorination of trichloroethylene in sediment

    Near neutral pH has been reported in the literature to optimise trichloroethylene (TCE) reductive dehalogenase activity in purified enzyme solutions, cell extracts and cell suspensions. In this study, microencapsulated alkaline buffers were used to evaluate potential use in controlling pH in soil microcosms and columns containing sediment obtained from a TCE-contaminated acidic aquifer at the ...


    By Inderscience Publishers

  • Reductive Dechlorination of Solvents in Groundwater Using Controlled-Release Carbon with Microscale ZVI

    Untitled Document ABSTRACT: Groundwater beneath an active grain storage facility in south central Kansas is impacted by carbon tetrachloride (CT) which was used as a silo fumigant. ...


  • Pilots to enhance trichloroethene reductive dechlorination and ferrous sulfide abiotic transformation

    Two field pilots are being conducted at Altus Air Force Base (AFB), Oklahoma in areas with high levels of sulfate and iron. An edible oil emulsion was injected into these pilots to promote biological reductive dechlorination of trichloroethene (TCE) and to stimulate ferric sulfide and ferric disulfide production and the abiotic reaction with TCE. Within the injection zone of the larger SS-17 ...


    By Terra Systems, Inc. (TSI)

  • 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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