Use of microbubble dispersion for soil scouring
- Virginia Dept. of Environmental Quality, Richmond, VA (United States)
- Argonne National Lab., IL (United States)
- Virginia Polytechnic Inst. and State Univ., Blacksburg, VA (United States). Dept. of Chemical Engineering
Techniques for generating a microbubble dispersion (colloidal gas aphrons) have been developed. The microbubbles typically consist of 60 to 70% dispersion of 55-{micro} microbubbles in water, although dispersion up to 90 to 95% can be generated continuously. A number of laboratory soil column flow studies have been completed to define the potential of using these microbubbles to scour and release dispersed organics for subsequent pumping and removal or to enhance in situ degradation. The higher viscosity foams flow forward and fill up larger channels. The pressure drop builds up in the channel, resulting in foam flow into less accessible spill zones. In scouring hexadecane from columns containing 50- to 70-mesh sand, following a water preflush, up to 80% of the remaining organic could be flushed using a 70% CGA quality (70% air, 30% liquid). The technique was less effective at lower CGA quality. In genera, a surfactant concentration of 1,000 to 5,000 ppm was needed to generate the microbubbles.
- OSTI ID:
- 467770
- Report Number(s):
- CONF-950483-; ISBN 1-57477-003-9; TRN: IM9721%%198
- Resource Relation:
- Conference: 3. international in situ and on-site bioreclamation symposium, San Diego, CA (United States), 24-27 Apr 1995; Other Information: PBD: 1995; Related Information: Is Part Of In situ aeration: Air sparging, bioventing, and related remediation process; Hinchee, R.E. [ed.] [Battelle Memorial Inst., Columbus, OH (United States)]; Miller, R.N. [ed.] [Air Force Center for Environmental Excellence, Brooks AFB, TX (United States)]; Johnson, P.C. [ed.] [Arizona State Univ., Tempe, AZ (United States)]; PB: 630 p.; Bioremediation, Volume 3(2)
- Country of Publication:
- United States
- Language:
- English
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