Using the results of the push-pull tests, the plume behavior was modeled to predict the plume's migration and persistence due to abiotic processes, unamended conditions, and biostimulated conditions.
Improved Simulation of Contamination in Fractured Rock
Collectively, these techniques were used to calculate mass reduction per dollar rate estimates for natural attenuation unamended conditions versus biostimulation amended conditions to develop the most cost-effective and successful remedial strategy. Engineering and Land Planning Assoc. Istok, J. Fields, J. Jones, A. Peacock, and G. In situ degradation rates are typically determined through calculating decreases in chemical concentrations over time from long-term groundwater monitoring programs, which can be a costly and time-consuming approach.
A field study was conducted using existing but underutilized remedial investigative tools to assess the feasibility of applying these techniques to determine degradation rate kinetics more quickly and cheaply than with the conventional approach. The field study was conducted at a petroleum distribution facility in New Jersey, where gasoline and an off-site source of tetrachloroethene PCE comingled. The objective was to create a protocol of sequential tests to determine if unamended natural attenuation was a sufficient remedial strategy for the site or if bio-stimulation or bioaugmentation was necessary, and then to quickly and cost-effectively screen these processes to select the remedial strategy with the greatest probability of success for this site.
The following techniques were assessed.
- Jack Istok, P.E. (OR) | Civil and Construction Engineering | Oregon State University.
- Functional analysis?
- Pre-Milestone A and Early-Phase Systems Engineering: A Retrospective Review and Benefits for Future Air Force Acquisition.
This novel, in-well sampling device is often referred to as an in-well microcosm. A test solution contained the same electron acceptors oxygen, nitrate and sulfate used in the Bio-Trap study in addition to a conservative tracer bromide to segregate abiotic and biotic in situ degradation rates of the chemicals of interest over time short term when exposed to different biostimulation substrates.
Baited with electron acceptors, the Bio-traps were loaded with a 13C-labeled benzene and passive flux meters to quantify mass reduction of the 13C-labeled benzene. This allowed comparison of the biostimulated degradation rates to unamended degradation rates to determine whether natural attenuation could stand alone as a remedy or if bio-stimulation produced significantly better results.
The different substrates were screened to identify which one had the highest probability of favorable results for a full-scale implementation. The biodegradation rates from the Bio-trap and push-pull studies were compared for similarities and contrasted with the overall site degradation rates generated from years of groundwater monitoring at the site.
Mortimer, New Jersey Inst. Field data at six former manufactured gas plant sites in New Jersey were used to estimate the biodegradation rate constants for the anaerobic processes naturally occurring within the groundwater contaminant plumes. Those rate constants turned out to be about an order of magnitude smaller than values reported for benzene and naphthalene at fuel sites.
Push-Pull Tests for Site Characterization / Edition 1
Field Oregon State Univ. Peacock Microbial Insights, Inc. Researchers used field sampling and testing in 10 monitoring wells to investigate the relationship between baseline geochemical and microbial community data and in situ reductive dechlorination rates at a site contaminated with trichloroethene TCE and carbon tetrachloride CTET. Limin Wu. James K Edzwald. Principles and Practice of Modern Chromatographic Methods. Kevin Robards. Monitoring of Air Pollutants.
Patricia Forbes. James Sheng. Julian Jones. Bioreactors for Waste Gas Treatment. Self-Cleaning Materials and Surfaces. Walid A. Density Gradient Centrifugation. Surface Engineering of Light Alloys. Hanshan Dong.
Rapid Site Characterization
Green Energetic Materials. Tore Brinck. Downstream Industrial Biotechnology. Michael C. Nanoimprint Technology. Jun Taniguchi. Self-Healing Polymers and Polymer Composites.
Ming Qiu Zhang. Catalysts for Upgrading Heavy Petroleum Feeds.
Edward Furimsky. Reservoir Formation Damage. Faruk Civan. Thermoset Nanocomposites. Vikas Mittal. Nanotechnology Cookbook. Andrew Collins. Hillslope Hydrology and Stability. Jonathan W. Fluorinated Ionomers. Walther Grot. Rocks and Minerals of The World.
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