Evolution of predictive tools for in situ bioremediation and natural attenuation evaluations

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Abstract

Proving the viability of in situ bioremediation technologies and gathering data for its full-scale implementation typically involves collecting multiple rounds of data and often completing microcosm studies. Collecting these data is cumbersome, time-consuming, costly, and typically difficult to scale. A new method of completing microcosm studies in situ using an amendable sampling device deployed and incubated in groundwater monitoring wells provides actionable data to expedite site cleanup. The device, referred to as a Bio-Trap® sampler, is designed to collect actively colonizing microbes and dissolved organic compounds from groundwater for analysis using conventional analytical techniques and advanced diagnostic tools that can answer very specific design and viability questions relating to bioremediation.

Key data that can be provided by in situ microcosm studies using Bio-Trap® samplers include definitively demonstrating contaminant destruction by using compound-specific isotope analysis and providing data on the mechanism of the degradation by identifying the responsible microbes. Three case studies are presented that demonstrate the combined flexibility of Bio-Trap® samplers and advanced site diagnostics. The applications include demonstrating natural attenuation of dissolved chlorinated solvents, demonstrating natural attenuation of dissolved petroleum compounds, and using multiple Bio-Trap® samplers to comparatively assess the viability of bioaugmentation at a chlorinated solvent release site. At each of these sites, the in situ microcosm studies quickly and cost-effectively answered key design and viability questions, allowing for regulatory approval and successful full-scale implementation. © 2010 Wiley Periodicals, Inc.

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