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DTIC ADA492279: Air Sparging Design Paradigm |
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by Defense Technical Information Center |
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Air sparging generally involves the injection of air into |
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an aquifer through vertical or horizontal wells. In |
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situations where contaminant vapor recovery is necessary |
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(e.g., as required by regulation, or in situations where |
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vapor migration could cause adverse impacts), air |
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sparging systems are coupled with soil vapor extraction |
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(SVE) systems. Historically, practitioners have installed |
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air sparging systems to: (1) treat immiscible contaminant |
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source zones at or below the capillary fringe; (2) |
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remediate dissolved contaminant plumes; and (3) provide |
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barriers to prevent dissolved contaminant plume |
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migration. Air sparging systems are also now being |
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incorporated into novel aquifer bioremediation schemes |
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for the delivery of other gases (e.g., oxygen, hydrogen, |
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propane), and they have also been used as a means of |
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improving air distribution for bioventing applications |
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targeting near-capillary fringe soils. Some practitioners |
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implement a variation of air sparging that they term |
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biosparging. In practice, the term biosparging is |
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frequently used to refer to air sparging systems when the |
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intent is to operate without an SVE system. The helium |
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air recovery tests discussed above can be used to |
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quantify the efficiency of vapor capture during combined |
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IAS and SVE operation, and can provide valuable insight |
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to the areal distribution of IAS treatment zones. The |
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ease and speed with which these tests can be conducted |
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and interpreted makes them well suited for IAS pilot |
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tests (even 1-day tests). The helium tests can also be |
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conducted on full-scale systems already in operation to |
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confirm that SVE system performance meets project goals. |
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In addition, the tests can be easily repeated, which |
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allows system parameters to be modified and the impact of |
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those modifications to be quickly assessed. The three |
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case histories presented here were chosen to represent |
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the kinds of conclusion that can be drawn from the tests. |
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Date Published: 2018-06-29 08:52:50 |
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Identifier: DTIC_ADA492279 |
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Item Size: 99514830 |
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Language: english |
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Media Type: texts |
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# Topics |
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DTIC Archive; Leeson, Andrea; BATTELL... |
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