EPA 540-R-94/529a
Subsurface Volatilization and Ventilation System (SVVS)
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Subsurface Volatilization and Ventilation System
(SVVS) (612K)
ABSTRACT
Subsurface Volatilization and
Ventilation System (SVVS)
SITE Technology Capsule
EPA 540-R-94/529a
June 1995
The Subsurface Volatilization and Ventilation System is an integrated technology
used for attacking all phases of volatile organic compound (VOC) contamination
in soil and groundwater. The SVVS technology promotes insitu remediation of
soil and groundwater contaminated with or-ganic compounds through the injection
of air into the saturated and unsaturated zones, and extraction of vapors from
the vadose zone. Through this process, volatile and semivolatile organic compounds
are stripped from the soil and groundwater. The subsurface circulation of air
also increases dissolved oxygen concentrations in the saturated zone, capillary
fringe, and vadose zone, thereby promoting aerobic microbiological processes.
The contaminated air extracted from the wells can be treated at the surface
before being discharged to the environment.
The SVVS process was evaluated under the SITE program at the EV facility in
Buchanan, Ml. The soils were contaminated with aromatic hydrocarbons, and halogenated
and non-halogenated volatile and semivolatile organic com-pounds (SVOCs) through
discharge into a dry well. Baseline data indicated that approximately 1,000
kg of VOC and SVOC contamination was present in the dry well area soils, princi-pally
in a subsurface sludge layer. The developer claimed that their technology would
reduce the sum of seven target VOCs by 30% over a 1-yr period.
The results from the demonstration indicate the SVVS technology greatly exceeded
their claims by providing a site average 80.6% reduction of volatile organics
in the vadose zone. Furthermore, aerial and vertical reductions across the site
did not indicate the presence of any zones that were not treated by the system.
The SVVS process proved to be reliable and required minimal operator oversight.
The technology did not experience significant operational difficulties during
the evaluation period.
The SVVS remediation technology was evaluated based on seven criteria used for
decision making in the Superfund feasibility study (FS) process. Results of
the evaluation are summarized in Table 1.
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Posted February 26, 1999
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