aquifer Articles
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PCE, 1,1,1-TCA and 1,1-DCE Bioremediation at a New Jersey Manufacturing and Plating Company - Case Study
Background CL-Out bioremediation successfully restored aquifer conditions at an operating industrial site in central New Jersey. The cleanup goal was to reduce the contaminant mass sufficiently to meet site-specific goals to prevent offsite migration ...
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Case Study - Monitoring Natural Attenuation - Catalonia, Spain
Researchers at Universitat de Barcelona and University of Waterloo made use of EnviroInsite's advanced data visualization capabilities to contour hot-spots of TCE contamination and carbon isotopes. The results from multi-level sampling devices were then shown on a x-section to illustrate the loss of PCE in the direction of flow and variability of PCE and TCE isotopes vertically across the ...
By EI LLC
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PCE Bioremediation in Aerobic Groundwater
CL-Out microbes were used to remediate PCE in ground water at a former printing company in Kentucky. The ground-water stratigraphically was in an alluvial sand deposit with high permeability to facilitate the injection. The high permeability of the aquifer matrix also supported aerobic ground water conditions. With one application of CL-Out the concentration of PCE decreased from 3,600 ug/L to ...
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Bioaugmentation for accelerated in-situ anaerobic bioremediation
A successful anaerobic bioaugmentation was carried out on a trichloroethene (TCE)-contaminated aquifer at Dover Air Force Base, DE, using a microbial enrichment culture capable of dechlorinating TCE to ethene. A hydraulically controlled pilot system 12 18 m was constructed 15 m below ground surface in an alluvial aquifer to introduce nutrients and substrate into the groundwater. Ambient TCE and ...
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Prevent Stagnation Zones during Injection to Improve Contact Efficiency
When injecting into multiple wells simultaneously, stagnation zones can develop preventing effective reagent delivery. Figure 1 shows the simulated EOS Pro distribution in a homogeneous aquifer when EOS Pro is injected into all the wells in a biobarrier at the same time. Simultaneous injection creates gaps in the biobarrier where converging streamlines prevent effective distribution. ...
By Redox Tech
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Dynamics of nitrate & perchlorate in groundwater.
The Apache Powder Superfund Site is located in Cochise County, Arizona, approximately 50 miles southeast of Tucson. The site was listed on the National Priorities List pursuant to CERCLA in 1990. Principal groundwater chemicals of concern (COCs) include nitrate-nitrogen (nitrate-N) and perchlorate. Concentrations of nitrate-N exceeding 500 mg/l and 2,300 mg/l have been detected in the “shallow ...
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Using CoBupH MG to adjust aquifer pH - Case Study
Problem A US Government site had elevated TCE. Low aquifer pH stalled in situ bioremediation. Project Goal Inject organic substrate in the aquifer to enable naturally-occuring bacteria to effect in situ anaerobic reductive dechlorination Control pH to sustain long-term performance Achieve regulatory remediation levels of 5 µg/L TCE in groundwater and 53 µg/kg TCE in soil ...
By Redox Tech
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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 ...
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Vermont Dry Cleaner Remediation Using CL-Out
Cl-Out bioremediation was used to remove PCE from ground water at a dry cleaners in Vermont. CL-Out micorbes were selected for bioremediation of the site because they are compatible with the natural aerobic aquifer conditions. One application of CL-Out bioaugmentation reduced the PCE concentration by 90% in less than 6 months without increasing the vinyl chloride concentrations. The following ...
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Industrial Site, Houston, Texas - Case Study
Site Summary BioLogix CL bioaugmentation was implemented in combination with dual phase extraction at an industrial site near Houston, Texas to remove trichloroethylene (TCE) from ground water. The overlying contaminated soil was excavated, but perched ground water and a deeper aquifer had TCE concentrations greater than 10,000 |jg/L A dual-phase vacuum extraction system was installed to control ...
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Bioremediation of 1,2-dichloroethane with INTEROX® case study
At a chemica plant in a harbour area, the surface aquifer was contaminated with 1,2-dichoroethane (1,2-DCEa) which had to be remediated. Site characterisation, and laboratory tests demonstrated that oxygen was the limiting factor for the insitu biodegradation of 1,2-DCEa. The remedial strategy was based on flushing with simuftaneous aerobic biodegradation enhancement. Biodegradation was ...
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Direct-Push Injection and Circulation Biobarrier to Remediate a TCE Groundwater Plume
ABSTRACT: The goal of this study was to determine if direct-push drilling methods combined with a circulation system could be used to establish a passive biobarrier in a very transmissive aquifer to treat tricholoroethene (TCE). The Site is located in central Indiana, where historic use of TCE has impacted an unconfined aquifer. A plume consisting primarily of TCE has migrated from west to east ...
By Redox Tech
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Verification of CL-Out’s Effectiveness at a New Jersey Industrial Site - Case Study
Project Summary Industrial solvents were found in the ground water at a former industrial site on an unused airfield in New Jersey. The contamination was mainly found in ground water in thick coastal sediments. Prior to selection of a full-scale remedy, a pilot study was completed to verify the effectiveness of CL-Out bioremediation and to develop site-specific performance information for the ...
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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
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Groundwater/surface water interactions along the Curtiss reach of the San Pedro River.
A reach of the San Pedro River flows east of the Apache Powder Superfund Site and west of the Town of St. David in Cochise County, Arizona. As a result of the remedial investigations associated with the Superfund Site, this reach has been surveyed extensively since the mid-1980’s from approximately the Escalante Crossing to the Pomerene Diversion. In particular, the section downstream from ...
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Gasoline pipeline break - Sun Pipeline Company
LOCATION: Southeastern, PennsylvaniaPROJECT DATE: November, 1984 to October, 1991CLIENT: Sun Pipe Line Company BACKGROUND: A pipeline break resulted in the spill of 100,000 gallons of gasoline to a highly fractured shale aquifer. A number of private drinking water wells were affected. In excess of 10 homeowners were forced to vacate due to gasoline vapors in their homes. Producing wells were ...
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Transport of Edible Oil Emulsions in Clayey Sands: 3D Sandbox Results and Model Validation
ABSTRACT: Injection of edible oils into the subsurface can provide an effective, low-cost alternative for stimulating anaerobic bioremediation processes. However, concerns have been raised about the effects of oil buoyancy and variations in aquifer permeability on the final distribution of oil in the subsurface. Three dimensional sandbox experiments were conducted to study the distribution of ...
By Redox Tech
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IEG multi level sampling well (MLSW) case study - IEG Technologie GmbH
The MLSW-system is used for the recovery of multiple high-quality samples of soil-gas and groundwater from numerous isolated horizons in a single standard borehole. The system is also used to accurately delineate contamination profiles in three dimensions, which is vital or the design, installation and monitoring of remediation systems. MLSWs also can be used for activly dispersing ...
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Behavior of energetic materials in ground water at an anti-tank range
An environmental issue has arisen with M-72 malfunction on anti-tank ranges because many of these rockets break into pieces without exploding on impact, dispersing their energetic materials content on the ground surface and exposing them to transport by infiltration of rainfall and snowmelt. A case study (1998–2005) at Arnhem Anti-Tank Range (Garrison Valcartier, Canada, in operation since the ...
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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 ...
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