dechlorination bacteria 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 ...

  • 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 ...


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  • 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 ...


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  • Design tool for estimation of buffer requirement for enhanced reductive dechlorination of chlorinated solvents in groundwater

    To assist in the design of enhanced reductive dechlorination systems for in situ remediation of chlorinated solvent source zones, the software BUCHLORAC (BUffering of deCHLORination ACidity) was developed to predict the amount of buffer required to maintain the groundwater pH in a DNAPL treatment zone within the optimal range for dechlorinating bacteria. Reductive dechlorination is an acidforming ...


    By True Blue Technologies, Inc.

  • Design tool for estimation of buffer requirement for enhanced reductive dechlorination of chlorinated solvents in groundwater

    Abstract To assist in the design of enhanced reductive dechlorination systems for in situ remediation of chlorinated solvent source zones, the software BUCHLORAC (Buffering Of Dechlorination Acidity) was developed to pr edict the amount of buffer required to maintain the groundwater pH in a DNAPL treatment zone within the optimal range for dechlorinating bacteria. Reductive ...


    By RNAS Remediation Products

  • Bioremediation Consulting Inc (BCI) develops an anaerobic chloroform-degrading culture

    BCI’s newest culture is a microbial mixture (consortia) which can transform chloroform (CF) to dichloroemthane (DCM), a transient intermediate which is then converted to a non-chlorinated product.  We have demonstrated that the culture can dechlorinate at least 10 ppm of chloroform. Dechlorinating Bacteria in BCI Cultures. To address single compounds or a mixture of chlorinated ethenes, BCI ...

  • Full-scale KB-1® Bioaugmented Biobarrier for TCE Plume Containment

    Problem DefinitionThe site is a former manufacturing facility, where a historic trichloroethene (TCE) release created a plume 1,100 feet wide and 7,000 feet long averaging 3,600 micrograms per liter (μg/ L) TCE, with a groundwater velocity of about 2 feet per day. Prior to biostimulation with electron donor, the groundwater conditions ranged from aerobic to mildly reducing and Gene-Trac DNA ...


    By SIREM

  • 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

  • Effect of oxygen availability on the removal efficiency and sludge characteristics during pentachlorophenol (PCP) biodegradation in a coupled granular sludge system

    This study systematically investigated the metabolism of pentachlorophenol (PCP) in batch experiments using coupled sludge granules under various dissolved oxygen concentrations. Results indicated that the oxygen condition in serum bottles has a significant effect on the microorganism metabolism. A greater degree of mineralization of PCP was achieved under oxygen-limited conditions (e.g., 40 and ...


    By IWA Publishing

  • KB-1® Bioaugmentation Leading to Site Closure

    Problem DefinitionIn 2004, the site was an active manufacturing facility with plume trichloroethene (TCE) concentrations ranging from 1 to 20 milligrams per liter (mg/L), and hexavalent chromium (Cr[VI]) ranging from 0.5 to 7 mg/L. Intermediate degradation products of TCE were present in only trace concentrations in this primarily aerobic aquifer. The site source area was excavated in March ...


    By SIREM

  • Heating up natural remediation

    Manjit Kahlon of Provectus Group Ltd describes how it investigated the effect of thermally enhanced soil vapour extraction (TESVE) on indigenous microbial communities and the potential for subsequent biological polishing of chlorinated solvents Field trials were done at the Western Storage Area (WSA) of Harwell in Oxfordshire, a former nuclear research site being decommissioned by Research Sites ...


    By Newzeye Ltd

  • DOD evaluates bioaugmentation for remediating low-pH aquifers

    The US Department of Defense (DOD) has completed pilot-scale work on the 'MAG-1' site at Fort Dix, NJ, to test suitability of anaerobic bioremediation for an aquifer with low pH. Project results will be used to design full-scale ground-water treatment at MAG-1. In addition, technical criteria gained from the demonstration will be integrated into DOD’s remediation strategy for its many facilities ...

  • EOS Permeable reactive barriers successfully treat a large Trichloroethene plume - Case Study

    Historical use of trichloroethene (TCE) and other chlorinated solvents at a former au-tomotive parts manufacturing plant in Indiana resulted in a large groundwater plume, stretching approximately 2 miles from the site. TetraTech GEO evaluated sev-eral remedial alternatives and selected enhanced in situ bioremediation to reduce contaminant concentrations and eliminate continued plume migration at ...


    By EOS Remediation, LLC

  • Differential Stimulation of Haloreduction by Carbon Addition to Subsurface Soils (PDF)

    Highly substituted ethenes such as PCE and TCE are susceptible to microbial reductive dehalogenation and halorespiration under anaerobic conditions. The objective of this study was to evaluate whether soil from a bulk aerobic aquifer, historically contaminated with chlorinated ethenes (CEs), could be made anaerobic by carbon source addition to enhance haloreduction, and to evaluate how the ...


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  • Peracetic Acid – is it an Environmentally Friendly Alternative to Chlorine?

     ABSTRACT Concerns with chlorine disinfection have led to investigation of alternative disinfectants for use in the environmental arena. Are there environmentally safe alternatives to chlorine? Is peracetic acid one among these? Peracetic acid is one among several chemicals that have been touted as a replacement in recent years. Peracetic acid is very effective in killing bacteria, ...

  • A Pilot Study Using HRCTM to Enhance Bioremediation of CAHs.

    ABSTRACT: The effect of Hydrogen Release Compound (HRCTM) in enhancing the anaerobic bioremediation of chlorinated aliphatic hydrocarbons (CAHs) was observed in a single well pilot study. HRC is a proprietary, environmentally safe, food quality, polylactate ester formulated for the slow release of lactic acid upon hydration. Microbes metabolize the lactic acid releases by HRC and produce ...


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  • The Use of Hydrogen Release Compound (HRC) for CAH Bioremediation.

    Hydrogen Release Compound (HRC™) is a simple, passive, low-cost and long-term option for the anaerobic bioremediation of chlorinated aliphatic hydrocarbons (CAHs) via a reductive dehalogenation pathway. Applications to other classes of chlorinated compounds that are anaerobically degradable by this mechanism are under investigation. HRC should be viewed as a tool for the enhancement of natural ...


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  • Comparison of hollow-fiber ultrafiltration to the usepa viradel technique and usepa method 1623

    Received for publication April 2, 2008. Hollow-fiber ultrafiltration (UF) is a technique that is increasingly viewed as an effective alternative for simultaneously recovering diverse microbes (e.g., viruses, bacteria, parasites) from large volumes of drinking water. The USEPA has organism-specific methods, including Method 1623 for Cryptosporidium and Giardia and the virus adsorption–elution ...

  • Consideration of the Effects of Remediation Technologies on Natural Attenuation.

    ABSTRACT: We have long understood and continue to improve our understanding of the geochemical conditions that favor biodegradation of petroleum hydrocarbons. Over the last several years our understanding of the conditions that are necessary for and/or promote reductive dechlorination of chlorinated hydrocarbons has improved substantially. Over this time in situ remediation technologies have ...


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  • 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 ...


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