Field Treatability Study Report for Enhanced Biosparging System Using PHOSter~(TM) Technology

摘要

In June 2006, a trailer-mounted biosparging system with nutrient-enhancement capabilities was mobilized to MacDill Air Force Base (MAFB), Florida and staged at Solid Waste Management Unit (SWMU) 24 (Former Energy Management Test Laboratory [EMTL]) to complete a field treatability study. Specific objectives for the study included: evaluation of traditional biosparging (I.e., without nutrient enhancement) to convert groundwater from the existing reductive state to a more oxidative state; determination of the effective radius of influence (ROI) for the biosparging injection points; determination of sustainable injection flow rates; evaluation of geochemical parameters over time; evaluation of the reduction of groundwater COC concentrations over time; and determination of microbial enumerations prior to and upon completion of the treatability study. The following results were determined by this study: injection flow rates were successfully maintained between 8 and 9 standard cubic feet per minute (scfm); an effective ROI of at least 15 feet was achieved; field and geochemical parameters indicated biosparging was successful at converting the highly reductive (methanogenic) conditions of groundwater at the site to more oxidative conditions; laboratory analysis revealed a significant reduction in the concentration of groundwater COCs; and an increase in total biomass and a shift in community structure occurred in response to biosparging activities.