Effect of sediment size on area of influence during groundwater remediation by air sparging: a laboratory approach |
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| Authors: | J W Peterson P A Lepczyk K L Lake |
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| Institution: | (1) Department of Geological and Environmental Sciences, Hope College, 35 E. 12th Street, Holland, Michigan 49423, USA e-mail: peterson@hope.edu, NL |
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| 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.
Received: 26 June 1998 · Accepted: 27 July 1998 |
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| Keywords: | Groundwater Remediation Air sparging Area of influence |
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