Abstract
Air sparging is a groundwater remediation technique, in which organic contaminants volatilize into air as it rises from the saturated to vadose zone. An unknown has been the relationship between sediment size and area affected by air. Laboratory experiments were performed on sediments to determine the area affected by air as a function of grain size. For average grain sizes of 1.1 and 1.3-mm diameter, air flow occurs in discrete meandering channels, with a maximum area of sediment column affected of 13%/m2 for 1.1-mm and 14%/m2 for 1.3-mm sediments. For average grain sizes of 1.84, 2.61 and 4.38-mm diameter, air flow is pervasive, forming a symmetrical cone of influence around the injection point. Maximum areas affected are15%/m2 for 1.84-mm, 25%/m2 for 2.61-mm, and 9%/m2 for 4.38-mm sediments. Optimal sites for air sparging, may be those with grain diameters between about 2–3 mm.
Published Version
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