Venting, Bioventing, Dual Phase Extraction, and
Soil venting is an innovative technology
for removing organic contaminants to remediate polluted
soil zones. The organic contaminants can be in the
soil in three different zones: as free "product"
in pools or residual globules, dissolved in the
groundwater, or as vapors in the vadose zone. Soil
venting directly deals with the free product and
the organic vapors in the vadose zone by applying
a vacuum through wells and extracting the air in
the contaminated zone. Soil venting also deals indirectly
with groundwater contamination, by removing the
overlying free product and vapors, promoting transfer
of the contaminants into the vadose zone, where
they are removed through the extraction wells.
Vapor Extraction (SVE) the RSI Way
RSI's patented systems use the vacuum from the engine's
intake manifold to extract the soil vapors. Air
flow rate is governed by the cubic inch displacement
of the engine, rpm, system load, and site specific
conditions. For large sites with multiple wells,
positive displacement blower(s) driven by the ICE
can provide extraction flow rates up to 2,300 SCFM.
Blower capacity in terms of total flow and vacuum
pressure can be sized to meet each specific remediation
design. For sites requiring higher vacuum (greater
than 18” Hg), liquid ring vacuum pumps can be driven
by the ICE.
Our innovative technology is more efficient than
traditional methods for removing free product. Placing
a vacuum on the well counteracts capillary forces
allowing for flow of the free product into the extraction
well during the SVE process. Second, the extracted
vapors are consumed by the normal combustion process
of the engine, therefore no need for costly storage
or disposal. And last, depending on the BTU value
of the contaminants, the use of alternate fuel source
is significantly reduced.
- 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
pooled above the groundwater, and hydrocarbon vapors
and contaminated water at the water table, which
considerably reduces total project costs.
RSI's system is also used for Bio-Venting, which
involves the flow of fresh air through the vadose
zone to increase oxygen content and accelerate bioremediation.
In Air Injection mode, heated air from the blowers,
or compressors, can be routed via reinjection wells.
Modules can be combined with the spray aeration
system, the ICE and/or catalytic oxidizers to completely
remove and destroy all of the contaminants. The
ICE provides power to all components and in the
case of petroleum hydrocarbon contamination, the
extracted contaminants are used as fuel by the ICE.
Natural gas or propane may be needed as supplemental
fuel if the amount of fuel extracted is below the
ICE requirements. RSI's system's diversity provides
truly innovative environmental solutions to the
most challenging site conditions.
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