up Ground Water with Pump & Treat, Bio-Slurping,
& Air Injection Combined
The predominant treatment for removing high
contaminant concentrations found in extracted
groundwater has been a combination of air stripping
followed by activated carbon polishing prior to
discharge. Conventional air strippers require a
large air-to-water flow ratio to achieve adequate
groundwater treatment objectives. Although removal
of the groundwater is an effective plume containment
mechanism, this is hardly an efficient means for
treating groundwater. RSI’s (S)pray (A)eration
(V)acuum (E)xtraction (S.A.V.E.™) system
incorporates the basic principles of air stripping
with an innovative new twist.
Aeration Vacuum Extraction
Most organic contaminants have a favorable Henry’s
law coefficient for air stripping, given their relatively
low solubility in water and high vapor pressure.
RSI’s patented S.A.V.E.™ system uses the same principles
as a conventional air stripper; however, it enhances
the stripping process by:
the surface area between groundwater and air using
a finely atomized spray.
Waste heat, generated by the Internal Combustion
Engine (ICE) increases the temperature of the
groundwater increasing the vapor pressure of the
organic contaminants and furthering their vaporization
into the air phase.
vacuum generated by the ICE lowers the pressure,
which further enhances the transfer of contaminants
to the vapor phase.
in the Spray Aeration tank is recirculated, which
maintains a high water-to-air transfer rate.
combination of these four improvements over most
conventional air strippers significantly reduces
the air/water ratio, which results in less vapor
phase treatment. In the case of petroleum hydrocarbons
and MTBE, the contaminate becomes partial fuel for
- Dual Phase Extraction (DPE)
The introduction of the DPE module to the Soil Venting
Equipment (SVE) system allows us to perform dual-phase
extraction, removing the petroleum hydrocarbons
(NAPL phase) pooled above the groundwater, as well
as hydrocarbon vapors and contaminated water at
the water table, which considerably reduces site
cleanup time and total project costs.
A blower or air compressor is attached to the
ICE to generate a volume of air at a certain design
pressure which is injected into the groundwater
at the source of contamination. Injected air also
promotes biodegradation in the aquifer and in the
vadose zone (Bioventing). Groundwater with high
levels of dissolved iron, calcium and other inorganic
constituents must be pretreated before the spray
aeration module to reduce maintenance costs.
The S.A.V.E.™ System
A complete system solution can be provided based
on our customer’s needs. The S.A.V.E.™ system is
mounted on a dual-axle trailer with the ICE, to
minimize space requirements and simplify transport
and startup. Automation of these modules using the
Phoenix S.A.V.E.™ Controller makes system operation
simple and user friendly. Innovative environmental
solutions by RSI.
here to enlarge