aquifer bioremediation Articles

  • Aerobic Bioremediation of MTBE and BTEX at a USCG Facility

    Untitled Document Abstract: A full-scale in-situ bioremediation of dissolved methl-tert-butyl-ether (MTBE) and benzene, toluene, ethylbenzene and xylenes (BTEX) was ...


    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

  • In Situ Biological Treatment for Ground Water, Surface Water, and Leachate

    The main advantage of in situ treatment is that it allows ground water to be treated without being brought to the surface, resulting in significant cost savings. In situ treatment, however, generally requires longer time periods, and there is less certainty about the uniformity of treatment because of the variability in aquifer characteristics and because the efficacy of the process is more ...

  • Successes and Limitations of Accelerating In Situ Bioremediation Using Oxygen-Release Compound in a Fractured Bedrock Aquifer (PDF)

    The addition of oxygen in a fractured bedrock aquifer was evaluated to determine its effectiveness in accelerating the in situ bioremediation of petroleum hydrocarbons. The source of oxygen selected to provide the enhancement for the pilot-scale study was Oxygen Release Compound (ORC ...


    By Regenesis

  • TCE Remediation in Saprolite and Bedrock Aquifers

    Site Summary Subsurface investigations at this operating manufacturing facility revealed TCE contamination in saprolite and bedrock aquifers. The complicated site geology created the need for a remedial strategy effective in tight soil and fractured bedrock. Accelerated bioremediation using HRC was selected for a pilot study because its use offered a remedial method that would not interrupt ...


    By Regenesis

  • Bioremediation of Nitrochlorobenzene, Nitroaniline, Chloroaniline, and Other Organics in Groundwater.

    ABSTRACT: The uppermost aquifer beneath a chemical plant contains residual concentrations of o-nitrochlorobenzene from a tank car spill, as well as other plant-related organic compounds of concern (COC), including 2-nitroaniline and o-chloroaniline. The aquifer consists of low permeability clays and silts, and produces only a few gallons of groundwater per day from a shallow ...


    By Regenesis

  • 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 ...

  • Anaerobic Bioremediation of Groundwater Using Edible Oil Substrate EOS® In an Unconfined Groundwater Aquifer

    ABSTRACT: To treat groundwater contaminants in situ, enhanced anaerobic bioremediation processes can be stimulated through addition of soluble substrates. At a dry cleaners site located in San Jose, California, the goal was to find a substrate that is long lasting and easily distributed into the saturated soils. After evaluating several alternatives, in situ bioremediation using an emulsified ...


    By EOS Remediation, LLC

  • Anaerobic bioremediation of groundwater using edible oil substrate EOS in an unconfined groundwater aquifer

    To treat groundwater contaminants in situ, enhanced anaerobic bioremediation processes can be stimulated through addition of soluble substrates. At a dry cleaners site located in San Jose, California, the goal was to find a substrate that is long lasting and easily distributed into the saturated soils. After evaluating several alternatives, in situ bioremediation using an emulsified edible oil ...


    By True Blue Technologies, Inc.

  • Dry cleaning plant: Boston, Massachusetts

    Site Summary Dry cleaning solvents were found in the soil under a parking lot adjacent to a large dry cleaning plant located in a mixed commercial and residential suburb of Boston, Massachusetts. The contamination was traced back to a storm water catch basin in the parking lot which contained sediment and sludge with high concentrations of the dry cleaning solvent perchloroethene (PCE). The ...


    By CL Solutions, LLC

  • Aquifers and hyporheic zones: Towards an ecological understanding of groundwater

    Ecological constraints in subsurface environments relate directly to groundwater flow, hydraulic conductivity, interstitial biogeochemistry, pore size, and hydrological linkages to adjacent aquifers and surface ecosystems. Groundwater ecology has evolved from a science describing the unique subterranean biota to its current form emphasising multidisciplinary studies that integrate hydrogeology ...


    By Springer

  • PCE and TCE Remediation Continues Years After Injection

    Site Summary Subsurface investigations at this dry cleaning facility revealed elevated levels of PCE and TCE in groundwater and soil. Accelerated bioremediation using HRC was selected for use at the subject site as it offered a groundwater remediation method that would not interrupt on-going facility operations while effectively supporting the degradation of the contaminants. Approximately 250 ...


    By Regenesis

  • Enhanced Bioremediation of Chlorinated Solvents (PDF)

    Enhanced in situ bioremediation of chlorinated solvents in groundwater has been successfully demonstrated at many sites by supplying lactic acid as an electron donor. The source of lactate for these successful pilot tests is Hydrogen Release Compound (HRC), a polylactate ester specially formulated for slow release of lactic acid upon hydration. HRC has been delivered to chlorinated ...


    By Regenesis

  • Bioremediation Following Dual Phase Extraction Saves Hundreds of Thousands of Dollars

    CL-Out® bioremediation was implemented at a dry cleaners site in Houston, Texas to reduce concentrations of residual PCE and other chlorinated solvents in groundwater following dual phase vacuum extraction.  After application of CL-Out® bioremediation the chlorinated solvent concentrations were reduced by 98% to 99% in less than 90 days.  The switch saved their client ...


    By CL Solutions, LLC

  • PCE and TCE Remediation at a Dry Cleaning Facility

    Site Summary Subsurface investigations at this operating dry cleaner site revealed elevated levels of PCE and TCE in the site soils and groundwater (perched aquifer). Soil remediation was accomplished via over-excavation in June of 1998. Accelerated bioremediation using HRC was selected to treat the groundwater contamination. The HRC ...


    By Regenesis

  • Bioremediation of chlorinated phenols with INTEROX® case study

    The mass balance enabed the evaluation of the individual contribution of the flushing and the biodegradation processes to the global remediation. Initially, flushing was the main process of remediation. After the deveopment of in situ conditions favorab e for the aerobic biodegradation, the main process of contamination remova is bioremediation contributing for 71% to the global contaminant ...


    By Solvay

  • 3-D Microemulsion (3DMe)™ Superior Distribution: Cost-Effective Treatment of Large Plumes

    3-D Microemulsion (3DMe)™, a form of HRC Advanced®, is the current state-of-the-art in slow-release electron donor products for the in-situ treatment of chlorinated solvents in groundwater. By employing a sequential, staged release of hydrogen, 3DMe provides an immediate and long-term release of hydrogen for enhanced longevity. Equally as important is the compound’s unique self-distribution ...


    By Regenesis

  • Perchlorate Remediation Project Case Study

    ARCADIS was contracted in 2000 to lead the development, evaluation and selection of a final groundwater remedy for this 94-acre site in California. As part of this work, ARCADIS is also participating in the evaluation of innovative technologies with the potential to treat soil impacts in the multiple source areas across the site. Specifically, the project is focused on the remediation of seven ...


    By Arcadis

  • In Situ Biological Treatment for Soil, Sediment, and Sludge

    The main advantage of in situ treatment is that it allows soil to be treated without being excavated and transported, resulting in potentially significant cost savings. However, in situ treatment generally requires longer time periods, and there is less certainty about the uniformity of treatment because of the variability in soil and aquifer characteristics and because the efficacy of the ...

  • Time-Release Electron Donor Technology: Results of Forty-Two Field Applications (PDF)

    Hydrogen Release Compound (HRC) is a food grade, polylactate ester that, upon being deposited into the aquifer, is slowly hydrolyzed to release lactic acid and other organic acid derivatives. The organic acids are fermented to hydrogen, which in turn donates electrons that drive reductive bioattenuation processes. HRC delivers electrons in a time-release fashion for about one year. The ...


    By Regenesis

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