In situ remediation of a shallow BTEX plume using vertical groundwater circulation (CGC) technology
- SBP Technologies, Inc., White Plains, NY (United States)
Remediation of a BTEX plume at a gasoline service station located adjacent to a waterway in lower Westchester County, New York, required the design, installation and operation of two Coaxial Groundwater Circulation (CGC) wells. The CGC units induce a vertical groundwater circulation cell around the well, drawing in contamination into the lower portion of the well for treatment and releasing treated groundwater back into the aquifer. The technique is hydraulically balanced and does not rely on extraction and surface treatment, as required by many conventional technologies. The presence of a 3-dimensional flow field provides soil flushing of the plume through heterogeneous soils. This flushing action mobilizes more contamination to the CGC wells for treatment and reduces rebound effects. This leads to quicker remediation times and shorter post monitoring of the plume. CGC systems use considerably lower injection pressures than conventional sparging wells, eliminating increases in heat. This leads to reduced fouling and reduced energy consumption. The data collected as part of the remediation effort included pressure transducer tests to verify the presence of the circulation cell and geochemical data to demonstrate chemical reductions by the CGC units. Data collected was used to validate the initial mathematical modeling used to predict the radius of influence of the vertical circulation cell. The results indicated that the radius of influence was 25 feet with an effective upgradient capture area of 80 feet in the shallow portion of the plume. Chemical reduction over the first 60 days indicated a 30% reduction in BTEX and a 54% reduction in Benzene. The two CGC units effectively captured the upgradient plume between the units without impacting the adjacent waterway.
- OSTI ID:
- 569934
- Report Number(s):
- CONF-971116--
- Country of Publication:
- United States
- Language:
- English
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