Optimized Enhanced Bioremediation Through 4D Geophysical Monitoring and Autonomous Data Collection, Processing and Analysis
Cost and performance rept.
ENVIRONMENTAL SECURITY TECHNOLOGY CERTIFICATION PROGRAM ALEXANDRIA VA
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Enhanced in situ bioremediation has become widely used, because it is relatively inexpensive and effective, as long as it is implemented appropriately. One of the major limitations to the effectiveness of in situ bioremediation is that performance is dependent on effective amendment delivery, and yet practitioners generally have little knowledge of the subsurface distribution of amendments. As a result, there is often substantial uncertainty about whether treatment design criteria have been met, or if and where and when additional injections are required. Such uncertainty is either addressed through dense sampling, or through overly conservative remedial efforts, both of which are costly. This project demonstrated the use of geophysical techniques to provide near real-time information on the spatial and temporal distribution of amendments noninvasively and cost effectively. The technology uses electrical resistivity measurements from a series of wells to detect changes in electrical conductivity. electrical resistivity monitoring is particularly useful for enhanced bioremediation because the amendment solutions used for bioremediation increase the bulk electrical conductivity significantly above the background conductivity. Time-lapse electrical resistivity monitoring can delineate where amendments were initially delivered, as well as track their migration and depletion over time. Near real-time information is particularly valuable because it can allow modifications andor additional injections while equipment is still present on site. The system demonstrated in this project is referred to as the Hydrogeophysical Performance Monitoring System HPMS. The HPMS consists of commercially available hardware and custom designed software for data collection, data transfer, data processing and web-based result visualization. Two demonstrations of the HPMS were performed at the Brandywine Defense Reutilization and Marketing Office DRMO site in Brandywine, Maryland.
- Geology, Geochemistry and Mineralogy
- Computer Programming and Software
- Solid Wastes and Pollution and Control