Site Remediation Articles
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Hunters Point Case Study (In Situ Gas Thermal Remediation (GTR™))
In Situ Thermal Remediation with Gas Thermal Remediation (GTR©) is being used to remove NAPL contaminants from a former military base. The system is extracting 378 liters (100 gallons) of liquid waste every week. LNAPLs, such as fuel and oils, and DNAPLs, such as PCBs and chlorinated solvents, are being removed from the subsurface to make way for a residential development. Three permits ...
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South LA: SVE Case Study (C3 Technology)
An active industrial facility in South Central Los Angeles was impacted by tetrachloroethylene (PCE) and trichloroethylene (TCE; former staging area degreasing) operations as a part of its operations. A phased approach to soil vapor extraction (SVE) remediation was employed: the goal of Phase I was to attain high contaminant mass removal rates with very high VOC vapor concentrations typically ...
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Loveland Case Study (In SItu Gas Thermal Remediation (GTR™))
The Loveland Sinclair gasoline station was selected for In-Situ Thermal Remediation (ISTR) using Gas Thermal Remediation (GTR) technologies. The GTR remediation system was designed to target a treatment area of approximately 14,000 square feet and includes a treatment volume of approximately 3,100 cubic yards. Vadose and saturated zone impacts, including a thin layer of light non-aqueous phase ...
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Cuyama Case Study (Ex Situ Gas Thermal Remediation(GTR™))
Ex Situ Thermal Desorption was used to successfully treat TPH-d and TPH-g from a former AST spill site in the agricultural zone in Central California. Affected soils were excavated and then placed “in a pile”, and Gas Thermal Remediation (GTR©) horizontal wells were placed into the pile during its three day construction. The piled soils represented mixed sands and high TOC soils, ...
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Why a Mold Inspection before Remediation is Always a Good Idea
There are several important reasons why Indoor Environmental Technologies, Inc. (IET), and published industry standards, recommend that a mold inspection be performed by a separate company prior to starting mold remediation. In fact, many of the better remediation contractors in Florida will not start a remediation project without a mold protocol in hand. Consider the following four reasons: 1. ...
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Highly efficient removal of chromium(VI) from aqueous solution using polyaniline/sepiolite nanofibers
Polyaniline/sepiolite (PANI/sepiolite) nanofibers were prepared by in situ chemical oxidation polymerization in the presence of sepiolite. The effect of aniline/sepiolite weight ratio on the nanostructure of PANI/sepiolite composites was investigated by field-emission scanning electron microscopy. The adsorption of Cr(VI) onto the PANI/sepiolite nanofibers was highly dependent on pH values. The ...
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Critical review of mercury SQVs for the protection of benthic invertebrates
Sediment Quality Values (SQVs) are commonly used – and misused – to characterize the need for investigation, understand causes of observed effects, and derive management strategies to protect benthic invertebrates from direct toxic effects. We compiled > 40 SQVs for mercury, nearly all of which are “co‐occurrence” SQVs derived from databases of paired chemistry and benthic invertebrate effects ...
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Optimizing Reverse Osmosis Membrane Life case study
Background An Independent District Heating and Cooling Facility used a municipal Lake Michigan water supply to operate a reverse osmosis system with three 200- gpm trains and was experiencing highpressure differentials and short runs between cleanings. The water had an SDI of 5–6 prior to the prefilters and an SDI of 3–4 after the prefilters. The system does not require continuous ...
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We only have one Earth, so we better start taking care of it.
Clocks are ticking, and the only planet we have to live on is changing right before our eyes. What are we going to do about it? We are all connected. Farmer or finance minister, president or plumber, we share the same home — this single, living planet. It’s the only home we have. And from my perspective it’s in dire need of attention. My perspective comes in part from the ...
By Ensia
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Characterization of utility boiler contributions to PM2.5
ABSTRACT Emissions from coal-fired utility boilers may contribute significantly to ambient particulate concentrations, especially in the very fine (below 2.5 micron) particle size range. Ambient PM2.5 speciation studies often show that geologic materials, which comprise the majority of fly ash produced by coal combustion, make up only a small fraction of the particulate. Sulphate, nitrates, and ...
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Controlling Methane ar ERD and ISCR Applications
In situ chemical reduction (ISCR) and enhanced reductive dehalogenation (ERD) have demonstrated success in the remediation of numerous recalcitrant and toxic compounds, including chlorinated ethenes and hexavalent chromium. ISCR describes the combined effect of stimulated biological oxygen consumption (via fermentation of an organic carbon source), direct chemical reduction with zero-valent iron ...
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Taking Fossil Fuels to the Next Level - Standards Underpin Extraction, Processing and Distribution
To the average person, the oil and gas industry may appear simple — a matter of literally tapping into a natural resource and distributing it to customers. Of course the matter of extraction is rarely simple, and in the case of emergent hydraulic fracturing technology, it is particularly complex and capital-intensive. In fact, the world of petroleum and natural gas extraction, distribution ...
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Depth of the biologically active zone in upland habitats at the Hanford Site, Washington: Implications for remediation and ecological risk management
Soil invertebrates, mammals, and plants penetrate and exploit the surface soil layer (i.e., the biologically active zone) to varying depths. As the U.S. Department of Energy remediates radioactive and hazardous wastes in soil at the Hanford Site, a site‐specific definition of the biologically active zone is needed to identify the depth to which remedial actions should be taken to protect the ...
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The use of microbial gene abundance in the development of fuel remediation guidelines in polar soils
Terrestrial fuel spills in Antarctica commonly occur on ice‐free land around research stations as the result of human activities. Successful clean‐up of spills requires appropriate targets that enable contaminated sites to be signed off as no longer posing environmental risk following remediation. These targets are based on knowledge of the impacts of contaminants on the soil ecosystem and on ...
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TerraStryke Erdenhanced Deep Aquifer cVOC Groundwater Remediation Evaluation Process Using Simple Additive Delivery Approach; NASA, Stennis Space Center Area D - CAse Study
TerraStryke Remediation Products LLC (TerraStryke) develop and distribute biostimulation additives proven to enhance any bioremediation project using low- impact, cost-effective biostimulation. Background: NASA Stennis Space Center, Passive Release Sock (PRS) Pilot Study. Evaluated additive efficacy under actual biogeochemical conditions. Past Site use impacted several groundwater bearing units ...
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Compliance Corner - Develop and implement
On March 25, 2003, the US Department of Transportation (DOT) issued an emergency revision to the Hazardous Materials Regulations (HMR) relating to security training and security planning for transporters and offerors (shippers) of hazardous materials (hazmat). DOT recognised a need to address growing concerns over the significant threat that hazmat can pose when it is used for malicious or ...
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Evaluation of Metals, Metalloids, and Ash Mixture Toxicity Using Sediment Toxicity Testing
In December 2008, a release of 4.1 million m3 of coal ash from the Tennessee Valley Authority Kingston Fossil plant occurred. Ash washed into the Emory River and migrated downstream into the Clinch and Tennessee Rivers. A Baseline Ecological Risk Assessment evaluated risks to ecological receptors from ash in the river system post‐dredging. This paper describes the approach used and results ...
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Removal of hexavalent chromium from aqueous solution using exfoliated polyaniline/montmorillonite composite
Exfoliated polyaniline/montmorillonite (PANI/MMT) composites with nanosheet structure were successfully prepared by in situ chemical oxidation polymerization with MMT platelets as the scaffold. Amphoteric polymer, (2-methacryloyloxyethyl)trimethyl ammonium chloride and methacrylate acid copolymer, was used to modify montmorillonite and a large number of carboxylic acids were introduced on the ...
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An investigation on the effect of geometric shape of streams on stream/ground water interactions and ground water flow
Ground water should be used efficiently and improved for sustainable water management plans. For this purpose, comprehensive ground water flow models are developed incorporating surface/ground water interactions. Typically, these models require a significant amount of hydrological parameters and the sensitivities of these parameters on interaction mechanisms need to be clarified. Therefore, in ...
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A mixed-integer non-linear programming with surrogate model for optimal remediation design of NAPLs contaminated aquifer
A mixed-integer non-linear programming (MINLP) with surrogate model was introduced to derive the optimal surfactant enhanced aquifer remediation (SEAR) process (remediation cost minimisation and removal rate maximisation) at a nitrobenzene-contaminated site. First, a 3D multi-phase flow simulation model was developed to simulate the SEAR process; using a radial basis function artificial neural ...
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