Soil Vapor Extraction
SVE, Air Injection, & Bioventing
Soil 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 blowers 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. The ability to deliver up to 156 brake horse power with the eight cylinder engine allows us to meet every customer need.
Air Injection & Bioventing
RSI’s system is also used for Bio-Venting, which involves the flow of fresh air through the vadose zone to in crease oxygen content and accelerate bioremediation. In Air Injection mode, heated air from the blowers, or compressors, can be routed via reinjection wells.
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).
The above 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.
Groundwater with high levels of dissolved iron, calcium and other inorganic constituents must be pretreated before the spray aeration module to reduce maintenance costs. A complete system solution can be provided based on our customer’s needs. Our remedial systems may be mounted on a trailer to minimize space requirements and simplify transport and startup.
Flow & Product Destroyed by RSI's SVE's
Total air throughput remains constant at set RPM and manifold vacuum. Engine manifold vacuum is a function of RPM, load, timing, and air-fuel ratio.
Systems are operated at high RPM, minimal load, advanced timing, and at or near stoichiometric air-fuel ratio, which results in high engine manifold vacuum.
Free Product Removal
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.
Increasing groundwater temperature to accomplish removal efficiency shown may require additional heat beyond waste energy of the engine. Please see RSI representative for complete details.