Air Sparging

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A technique for removing contaminants, such as the dissolved components of gasoline, from an underground water table.

The process involves injection of air beneath the surface of the water table. As the air bubbles through the water, volatile organic compounds present in the water transfer to the air bubbles and emerge in the form of vapor.

These contaminated vapors then collect in the surrounding soil. In turn, the contaminated vapors in the soil are removed by a process called soil vapor extraction.