• Engineered Approaches to In Situ Bioremediation of ...

    A biodegradation reaction in which bacteria gain energy and grow as one or more chlorine atoms on a chlorinated hydrocarbon are replaced with hydrogen in an environment devoid of oxygen. In the reaction, the chlorinated compound serves as the electron acceptor and hydrogen serves as the direct electron donor. Hydrogen used in this reaction ...

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  • Bioremediation of Chlorinated Solvents at an Operational ...

    HRC® successfully degrades TCE plume, protecting sensitive receptor. With AECOM. Based on Richard Bewley’s presentation & article: ‘Meeting The Challenges For Bioremediation Of Chlorinated Solvents Posed At Operational Sites: A Comparison of Case Studies’ - AquaConsoil, 2015

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  • The impact of chlorinated solvent co-contaminants on the ...

    Highlights We investigated the effects of chlorinated solvents on dioxane biodegradation. Both 1,1,1-trichloroethane and 1,1-dichloroethene inhibited dioxane (co)metabolism. Chlorinated solvent non-competitive inhibition was reversible for dioxane metabolism. Competitive inhibition was irreversible for dioxane cometabolism only. Co-contaminant chlorinated solvents may impair in situ dioxane ...

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  • Comprehensive Model for Enhanced Biodegradation of ...

    SABRE (Source Area BioREmediation) is a public/private consortium whose charter is to de-termine if enhanced anaerobic bioremediation can result in effective treatment of chlorinated solvent DNAPL source areas. The focus of this 4-year, $5.7 million research and development project is a field site in the United Kingdom containing TCE DNAPL. A comprehensive numerical model for simulating ...

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  • Enhanced Anaerobic Bioremediation | REGENESIS

    Enhanced anaerobic biodegradation is an effective solution for contaminants such as industrial degreasing agents like tetrachloroethylene, trichloroethylene, trichloroethane, carbon tetrachloride, certain pesticides/herbicides, nitro-aromatic explosives, hexavalent chromium, and chlorinated …

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  • Complete degradation of chlorinated ethenes and its ...

    Jun 13, 2020· This study evaluated the effectiveness of sequential anaerobic/aerobic biodegradation of tetrachloroethene (PCE) and its intermediates, cis-1,2-dichloroethene (cDCE) and vinyl chloride (VC). Two sand columns were operated in series. The first column simulated the up-gradient side of a groundwater system, was operated under anaerobic conditions, and was continuously fed the target …

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  • Biodegradation of Chlorinated Solvents: Reactions near ...

    Chlorinated solvents are among the most widespread groundwater contaminants in the country, contamination which is also among the most difficult and expensive for remediation. These solvents are biodegradable in the absence of oxygen, but this biodegradation requires both a food source for the organisms (electron donor) and the presence of ...

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  • Chlorinated-Ethene Biodegradation Processes--WRIR 99-4285

    Direct oxidation is limited to degrading lightly chlorinated solvents such as DCA, DCE, and VC; however, direct oxidation may serve a vital role in the sequential steps of chlorinated-solvent biodegradation. Aerobic or iron-reducing zones are commonly found downgradient of methanogenic or sulfate-reducing zones.

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  • Biodegradability of chlorinated solvents and related ...

    chlorinated solvents, basic principles of biodegradation and mechanisms of microbial dehalogenation. 1.1 Sources Chlorinated solvents and related chlorinated aliphatic structure enter into the biosphere from both industrial and natural sources. Literature data on industrial production and

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  • microbial degradation of chlorinated solvents a microcosm ...

    10/11/2018· International Biodeterioration & Biodegradation 84: 126-133. 9. Aulenta F, Majone M, Tandoi V (2006) Review Enhanced anaerobic bioremediation of chlorinated solvents: environmental factors influencing microbial activity and their relevance under field conditions. Journal Chemical Technology and Biotechnology 81: 1463-1474.

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  • Biodegradation of Chlorinated Solvents: Reactions near ...

    6/1/2001· The anaerobic biodegradation of chlorinated solvents is of great interest both for natural attenuation and for engineered remediation of these hazardous contaminants in groundwater. Compounds to be studied are carbon tetrachloride (CT) and the chlorinated ethenes, tetrachloroethene (PCE), trichloroethene (TCE) cis-1,2-dichloroethene (cDCE), and vinyl chloride (VC).

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  • Biodegradation Rates for Fuel Hydrocarbons and Chlorinated ...

    Jun 03, 2010· Biodegradation Rates for Fuel Hydrocarbons and Chlorinated Solvents in Groundwater Monica P. Suarez Civil and Environmental Engineering, University of Houston, 4800 Calhoun Rd., Engineering Building Room N107, Houston, TX 77204-4791 & Hanadi S. Rifai Civil and Environmental Engineering, University of Houston, 4800 Calhoun Rd., Engineering ...

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  • Stable Isotopic Investigations of In Situ Bioremediation ...

    shows great promise for mitigation of chlorinated solvents at many of these contaminated sites. Under its In Situ Technology Development Integrated Program, the EM-50 Office of Technology Development identified a need for a rapid method to detect in situ biodegradation products.

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  • Biodegradation Mechanisms: Chlorinated Solvents vs ...

    Biodegradation Mechanisms: Chlorinated Solvents vs Hydrocarbons. ... So the key points are that chlorinated solvents like TCE and PCE degrade relatively fast under anaerobic conditions, provided that suitable electron donors, such as hydrogen and acetate, are present. Some bacteria, known as "dehalorespirers," can obtain metabolic energy from ...

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  • Biodegradation of Chlorinated Solvents in Bioreactor ...

    The objective of this research is to investigate the intrinsic biodegradation potential of the municipal solid waste (MSW) landfill ecosystem for chlorinated aliphatic hydrocarbons (CAHs). The research was conducted in two complementary systems: simulated landfill bioreactors and batch degradation experiment in serum bottles.

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