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Soil vapour extraction is an established technology for the in-situ and ex-situ remediation of volatile organic compounds (VOCs) in sois. The process removes soil vapour contaminated with VOCs and generates a mass transfer of VOCs from the soil pores to the vapour phase.
A high percentage of petroluem hydrocarbon contaminant reduction in SVE schemes is achieved by enhanced biodegradation. The introduction of oxygen to the formation can replace the depleted oxygen used by indigenous aerobic bacteria and encourage a population growth.
Optimisation of a soil vapour extraction scheme for bio-venting can result in effective remediation of less volatile compounds such as those associated with diesel, kerosene or heavier oils.
Different site conditions and contaminants will require different applications of the process. Such vairables may include:
- Well spacing;
- Well construction;
- Extraction rate; and
- Applied vacuum.
GRS offers a wide range of systems for different applied vacuums and extraction rates including Zone 1 rated Explosion Proof systems for potentially explosive gases. Such systems are typically equipped with flame arrestors, bursting discs and in-line and ambient LEL detection systems.
Any of the systems can be constructed on skids or, more commonly, within Steel ISO shipping containers.
Associated Treatment Technologies
GRS also has a range of vapour treatment technologies including:
- Catalytic Oxidation;
- Activated carbon; and
- Solvent recovery systems
Complimentary Technologies
All vapour treatment systems are designed to be simply connected to the extraction system and integrated into the control logic.
SVE can be enhanced by a range of optimisation techniques including:
- Groundwater abstraction to lower the water table and expose the capillary fringe or smear zone to SVE;
- Air Sparging - the simultaneous injection of fresh air into the groundwater to volatilise and transfer to the vapour phase any dissolved phase VOC contaminants. In the right formation this can be considerably more effective than simultaneous groundwater abstraction.
SVE can also be used with Product recovery programmes to enhance (Vacuum Enhance) the recovery rate.
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in-situ remediation
Soil Vapour Extraction/Air Sparging
Dual-Phase (High Vacuum) Extraction
Multi-Phase (High Vacuum) Extraction
Product Recovery Technologies
water treatment
aqueous-phase activated carbon
air strippers and vacuum strippers
filters/settlement/oil-water separation/ion exchange
vapour treatment
vapour phase activated carbon
catalytic oxidation
solvent recovery
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