An in situ biosparging system, consisting of two horizontal injection wells, has operated since October 1999 at the U.S. Department of Energy (DOE) Savannah River Site (SRS). The remediation activities were designed to enhance the biological activity within distinct trichloroethene (TCE) and vinyl chloride (VC) plumes. The first horizontal injection well (SLH-1) targets the TCE plume by injecting air, methane, and nutrients to enhance cometabolic degradation. The second horizontal injection well (SLH-2) injects air to promote aerobic biooxidation of the VC. Downgradient of the injection wells, remediation of the groundwater continues through the processes of natural attenuation. By conjunctively using two numerical models, chlorinated degradation was simulated including (1) the cometabolic (methanotrophic) degradation of TCE, (2) the biostimulation of VC, and (3) the natural attenuation of both TCE and VC. The combined use of near-well and regional models coupled with this unique set of performance data allows for improved understanding and application of this technology.
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