Air Sparging
Air sparging is an in situ remedial technology that reduces concentrations of volatile organic compounds that are adsorbed to soils and dissolved in groundwater.
Introduction
Air sparging is an in-situ remedial technology that reduces concentrations of volatile organic compounds adsorbed to soils and dissolved in groundwater.
Contaminant-free air is injected into the subsurface saturated zone, enabling a phase transfer of hydrocarbons from a dissolved state to a vapour phase. Vapour is then vented through the unsaturated zone, and the addition of oxygen can also enhance biodegradation of contaminants above and below the water table.
Remediation techniques
Air sparging is most often used together with Soil Vapour Extraction (SVE), a combined system calledAS/SVE, where SVE creates a negative pressure in the unsaturated zone to control vapour plume migration. The technology is most effective for constituents with high volatility and low solubility, in soils with higher permeability, and is particularly applicable to lighter petrol constituents such as BTEX compounds.
Site Clearance
Before work can begin, it is often necessary to clear the site of any existing structures, vegetation, and waste.
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