Modeling Mass Removal during In Situ Air Sparging
Publication: Journal of Geotechnical and Geoenvironmental Engineering
Volume 125, Issue 11
Abstract
A model was developed to simulate mass removal during in situ air sparging. The model captures the physical characteristics of the air plume and employs conventional methods to simulate mass transfer. A parametric study was conducted using the model to assess how chemical properties, the operational method, and media affect mass removal during in situ air sparging. Mass removal is particularly sensitive to Henry's law constant, and the aqueous diffusion coefficient when Henry's law constant is high. Simulations of pulsed and continuous air injection show that pulsed injection can yield greater mass removal than continuous air injection for certain pulse cycles. Mass removal is generally greater at higher injection rates, but the increase in mass removal diminishes as the injection rate increases. Parametric analysis also showed that mass is removed faster when air channels are narrower or more tortuous (i.e., in coarser or more well-graded formations).
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References
1.
Acomb, L., McKay, D., Currier, P., Berglund, S., Sherhart, T., and Benediktsson, C. ( 1995). “Neutron probe measurements of air saturation near an air sparging well.” In situ aeration: Air sparging, bioventing and related remediation processes, R. Hinchee, R. Miller, and P. Johnson, eds., Battelle, Columbus, Ohio, 47–61.
2.
Ahlfeld, D., Dahmani, A., and Ji, W. ( 1994). “A conceptual model of field behavior of air sparging and its implications for application.” Groundwater Monitoring and Remediation, Fall, 132–139.
3.
Baker, D. ( 1996). “Physical modeling of in situ air sparging,” MS thesis, University of Wisconsin, Madison, Wis.
4.
Baker, D., and Benson, C. (1995). “Factors affecting in situ air sparging.” Proc., 1995 Non-Aqueous Phase Liquids (NAPLs) in Subsurface Envir.: Assessment and Remediation, L. Reddi, ed., ASCE, New York, 292–310.
5.
Bennett, C., and Myers, J. (1981). Momentum, heat and mass transfer. McGraw-Hill, New York.
6.
Bird, R., Stewart, W., and Lightfoot, E. (1960). Transport phenomena. Wiley, New York.
7.
Boersma, P., Petersen, F., Newman, P., and Huddleston, R. (1993). “Use of groundwater sparging to effect hydrocarbon biodegradation.” Proc., 1993 Petr. Hydrocarbons and Organic Chemicals in Ground Water, National Ground-Water Association, Dublin, Ohio, 557–569.
8.
Carslaw, H., and Jaeger, J. (1959). Conduction of heat in solids. Oxford-Clarendon Press.
9.
Chao, K., and Ong, S. ( 1995). “Air sparging: effects of VOCs and soil properties on VOC volatilization.” In situ aeration: Air sparging, bioventing and related remediation processes, R. Hinchee, R. Miller, and P. Johnson, eds., Battelle, Columbus, Ohio, 103–110.
10.
Chen, M., Hinkley, R., and Killough, J. (1996). “Computed tomography imaging of air sparging in porous media.” Water Resour. Res., 32(10), 3013–3024.
11.
Clark, A., Wilson, D., and Norris, R. (1996). “Using models for improving in-situ cleanup of groundwater.” Envir. Technol., 6(4), 34–41.
12.
Clayton, W. (1998). “A field and laboratory investigation of air fingering during sparging.” Groundwater Monitoring and Remediation, 18(2), 134–145.
13.
Clayton, W., and Nelson, C. (1995). “In situ sparging: Managing subsurface transport and mass transfer.” Proc., 1995 Superfund XVI Conf. and Exhibition, 1135–1144.
14.
Crank, J. (1975). The mathematics of diffusion. Clarendon, Oxford, England.
15.
Elder, C. ( 1997). “Modeling mass transfer during in situ air sparging,” MS thesis, University of Wisconsin, Madison, Wis.
16.
Elder, C., and Benson, C. (1999). “Air channel size, spacing, and tortuosity during in situ air sparging.” Groundwater Monitoring and Remediation, in press.
17.
Elder, C., Thorstad, P., Benson, C., and Eykholt, G. ( 1997). “A model for predicted mass removal during air sparging.” In situ remediation of the geoenvironment, Geotech. Spec. Publ. No. 71, ASCE, Reston, Va., 83–97.
18.
Falta, R., Pruess, S., Finsterle, S., and Battistelli, A. (1995). “T2VOC user's guide: Earth sciences division report.” Rept. LBL36400, Lawrence Berkeley Laboratory, Berkeley, Calif.
19.
Froment, G., and Bischoff, K. (1990). Chemical reactor analysis and design. Wiley, New York.
20.
Geankoplis, C. (1978). Transport processes and unit operations. Allyn and Bacon, Boston.
21.
Hein, G., Gierke, J., Hutzler, N., and Falta, R. (1997). “Three-dimensional experimental testing of a two-phase flow modeling approach for air sparging.” Groundwater Monitoring and Remediation, 13(4), 115–126.
22.
Hinchee, R. ( 1994). “Air sparging state of the art.” Air sparging for site remediation, R. Hinchee, ed., Lewis, Boca Raton, Fla., 1–12.
23.
Hoff, J., MacKay, D., Gillham, R., and Shiu, W. (1993). “Partitioning of organic chemicals at the air-water interface in environmental systems.” Envir. Sci. and Technol., 27(10), 2174–2180.
24.
Ji, W., Dahmani, A., Ahlfeld, D., Lin, J., and Hill, E. (1993). “Laboratory study of air sparging: Air flow visualization.” Groundwater Monitoring and Remediation, 13(4), 115–126.
25.
Johnson, P. (1998). “Assessment of the contributions of volatilization and biodegradation to in situ air sparging performance.” Envir. Sci. and Technol., 32(2), 276–281.
26.
Johnson, R., Johnson, P., McWorter, D., Hinchee, R., and Goodman, I. (1993). “An overview of in situ air sparging.” Groundwater Monitoring and Remediation, 13(4), 127–134.
27.
Leeson, A., Hinchee, R., Headington, G., and Vogel, C. ( 1995). “Air channel distribution during air sparging: A field experiment.” In situ aeration: Air sparging, bioventing and related remediation processes, R. Hinchee, R. Miller, and P. Johnson, eds., Battelle, Columbus, Ohio, 215–223.
28.
Lundegard, P., and LaBrecque, D. (1995). “Air sparging in a sandy aquifer (Florence, Oregon, USA): Actual and apparent radius of influence.” J. of Contaminant Hydrogeology, 19(1), 1–27.
29.
Lyman, W., Reidy, P., and Levy, B. (1992). Mobility and degradation of organic contaminants in subsurface environments. C. K. Smoley, Chelsea, Mich.
30.
Major, M. ( 1995). “A microbial boost for air sparging.” Remediation management, December, 40–43.
31.
McKay, D., and Acomb, L. (1996). “Neutron moisture probe measurements of fluid displacement during in situ air sparging.” Groundwater Monitoring and Remediation, 16(4), 86–94.
32.
MacKay, D., Roberts, P., and Cherry, J. (1985). “Transport of organic contaminants in groundwater.” Envir. Sci. and Technol., 19(5), 384–392.
33.
MacKay, D., and Shiu, W. (1981). “A critical review of Henry's law constants for chemicals of environment interest.” J. Phys. Chem. Reference Data, 10(4), 1175–1199.
34.
MacKay, D., Shiu, W., and Sutherland, R. (1979). “Determination of air-water Henry's law constants for hydrophobic pollutants.” Envir. Sci. and Technol., 13(3), 333–337.
35.
Montgomery, J. (1996). Groundwater chemicals desk reference. Lewis, New York.
36.
Mulder, M. (1996). Basic principles of membrane technology. Kluwer, Dordrecht, The Netherlands.
37.
Newman, P., Peterson, F., Boersma, P., and Huddleston, R. (1994). “The effects of sparging on groundwater hydraulics and groundwater quality.” Proc., Air and Water Mgmt. Assn. Annu. Conf.
38.
Pankow, J., Johnson, R., and Cherry, J. (1993). “Air sparging in gate wells in cutoff walls and trenches for control of plumes of volatile organic chemicals (VOCs).” Ground Water, 31(4), 654–663.
39.
Perry, R., and Green, D. (1997). Perry's chemical engineers' handbook. 7th Ed., McGraw–Hill, New York.
40.
Rabideau, A., Blayden, J., and Ganguly, C. (1998). “Field performance of air-sparging system for removing TCE from groundwater.” Envir. Sci. and Technol., 18(4), 120–130.
41.
Reddy, K., and Adams, J. ( 1997). “Effect of pulsed air injection during in-situ air sparging for groundwater remediation.” In situ remediation of the geoenvironment, Geotech. Spec. Publ. No. 71, ASCE, Reston, Va., 68–82.
42.
Reddy, K., and Zhou, J. (1996). “Development of air sparging model for groundwater remediation.” Proc., 4th Great Lakes Geotech./Geoenvironmental Conf. on In-Situ Remediation of Contaminated Sites, University of Illinois, Chicago, 215–225.
43.
Roberts, P., Hopkins, G., Munz, C., and Arturo, R. (1985). “Evaluating two-resistance models for air stripping of volatile organic contaminants in a countercurrent, packed column.” Envir. Sci. and Technol., 19, 164–173.
44.
Rutherford, K., and Johnson, P. (1996). “Effects of process control changes on aquifer oxygenation rates during in situ air sparging in homogeneous aquifers.” Groundwater Monitoring and Remediation, 16(4), 132–141.
45.
Schima, S., LaBrecque, D., and Lundegard, P. (1996). “Monitoring air sparging using resistivity tomography.” Groundwater Monitoring and Remediation, 16(2), 131–138.
46.
Schnoor, J. (1997). Environmental modeling: Fate and transport of pollutants in water, air, and soil. Wiley, New York.
47.
Sellers, K., and Schreiber, R. (1992). “Air sparging model for predicting ground water cleanup rate.” Proc., Petr. Hydrocarbon and Organic Chemicals in Ground Water, Prevention, Detection, and Restoration, National Ground Water Assn., Dublin, Ohio, 365–376.
48.
Skelland, A. (1974). Diffusional mass transfer. Wiley, New York.
49.
Thomas, R. (1982). “Volatilization in water.” Handbook of chemical property estimation methods, W. Lyman, W. Reehl, and D. Rosenblatt, eds., McGraw-Hill, New York.
50.
Treybal, R. (1980). Mass transfer operations. McGraw-Hill, New York.
51.
Unger, A., Sudicky, E., and Forsyth, P. (1995). “Mechanisms controlling vacuum extraction coupled with air sparging for remediation of heterogeneous formations contaminated with dense non-aqueous phase liquids.” Water Resour. Res., 31, 1913–1925.
52.
Weber, W. (1972). Physiochemical processes for water quality control. Wiley, New York.
53.
Weber, W., and DiGiano, F. (1996). Process dynamics in environmental systems. Wiley, New York.
54.
Wilson, D., Lahoz, C., and Maroto, J. (1994). “Groundwater cleanup by in-situ sparging. VIII. Effect of air channeling on dissolved volatile organic compounds removal efficiency.” Separation sci. and technol., 29(18), 2387–2418.
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Information
Published In
Journal of Geotechnical and Geoenvironmental Engineering
Volume 125 • Issue 11 • November 1999
Pages: 947 - 958
History
Received: Jan 14, 1998
Published online: Nov 1, 1999
Published in print: Nov 1999
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