Numerical Simulation of Transport of Four Heavy Metals in Kaolinite Clay
Publication: Journal of Environmental Engineering
Volume 125, Issue 4
Abstract
A multicomponent reactive solute-transport model was used to study the migration of dissolved heavy metals (Cd2+, Pb2+, Cu2+, and Zn2+) in a clay barrier subject to two leachates having different pH values. This solute-transport model is capable of simulating simultaneous processes of water flow, advective-dispersive-solute transport, and chemical reactions. The migration of these metals was simulated in a kaolinite landfill liner, which was assigned realistic physical and chemical properties and boundary conditions to model one-dimensional contaminant transport. The leachate input properties to the model were those of an actual leachate containing the four heavy metals. The numerical simulations were focused on the concentration profiles of these metals in the simulated clay barrier and leachate pH affects their mobilities. The numerical results indicate that with a nearly neutral leachate, the heavy metals mobility follows: Cd2+ < Pb2+ < Cu2+ < Zn2+. With an acidic leachate, the order changes to Pb2+ < Cu2+ < Zn2+ < Cd2+. Leachate pH has a significant effect on Cd2+ and Pb2+ mobility and a small effect on Cu2+ and Zn2+.
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References
1.
Allison, J. D., Brown, D. S., and Novo-Grada, K. J. ( 1990). MINTEQA2/PRODEFA2, a geochemical assessment model for environmental systems: Version 3.0 user's manual. Environmental Research Laboratory, U.S. Environmental Protection Agency, Athens, Ga.
2.
Cabral, A. R. ( 1992). “A study of clay compatibility to heavy metal transport in permeability testing,” PhD dissertation, McGill University, Montreal.
3.
Cederberg, G. A., Street, R. L., and Leckie, J. O. ( 1985). “A groundwater mass transport and equilibrium chemistry model for multicomponent systems.” Water Resour. Res., 21(8), 1095–1104.
4.
Farrah, H., and Pickering, W. F. ( 1977). “The sorption of lead and cadmium species by clay minerals.” Aust. J. Chem., 30, 1417–1422.
5.
Johnson, R. L., Cherry, J. A., and Pankow, J. F. ( 1989). “Diffusive contaminant transport in natural lay: A field example and implications for clay-lined waste disposal sites.” J. Envir. Sci. and Technol., 23(3), 340–349.
6.
Liu, C. W., and Narasimhan, T. N. ( 1989). “Redox-controlled multiple-species reactive chemical transport, 1. Model development.” Water Resour. Res., 25(5), 869–882.
7.
McBride, M. B. ( 1994). Environmental chemistry of soils. Oxford University Press, New York.
8.
Miller, C. W., and Benson, L. V. ( 1983). “Simulation of solute transport in a chemically reactive heterogeneous system: Model development and application.” Water Resour. Res. 19(2), 381–391.
9.
Millington, T. N., and Quirk, J. M. ( 1961). “Permeability of porous solids.” Trans. Faraday Soc., 57, 1200–1207.
10.
Orlov, D. S. ( 1992). Soil chemistry . Balkema, Brookfield Russian Translation series: 92, Rotterdam, The Netherlands.
11.
Phadungchewit, Y. ( 1989). “The role of pH and soil buffer capacity in heavy metal retention in clay soils,” PhD dissertation, McGill University, Montreal.
12.
Reardon, E. J. ( 1981). “Kd's—Can they be used to describe reversible ion sorption reaction in contaminant migration.” Ground Water, 19(3), 279–286.
13.
Rowe, R. K., and Booker, J. R. (1985). “1-D pollutant migration in soils of finite depth.”J. Geotech. Engrg., ASCE, 111(4), 479–499.
14.
Rowe, R. K., and Booker, J. R. ( 1990). “Contaminant migration in a regular two- or three-dimensional fracture network in reactive contaminants.” Int. J. Numer. and Analytical Methods in Geomech., 14, 401–425.
15.
Shackelford, C. D., and Daniel, D. E. (1991). “Diffusion in saturated soil. 1: Background.”J. Geotech. Engrg., ASCE, 117(3), 467–484.
16.
Simunek, J., and Suarez, D. L. ( 1994). “Two-dimensional transport model for variably saturated porous media with major ion chemistry.” Water Resour. Res., 30(4), 1115–1133.
17.
Wu, G. ( 1995). “Modelling of simultaneous processes of water flow, heat transfer, and multicomponent reactive solute transport in saturated-unsaturated porous media,” PhD dissertation, University of British Columbia, Vancouver.
18.
Wu, G., and Chieng, S. T. ( 1995a). “Modelling multicomponent reactive chemical transport in nonisothermal unsaturated/saturated soils: Part 1. Mathematical model development.” Trans. ASAE, 38(3), 817–826.
19.
Wu, G., and Chieng, S. T. ( 1995b). “Modelling multicomponent reactive chemical transport in nonisothermal unsaturated/saturated soils: Part 2. Numerical simulations.” Trans. ASAE, 38(3), 827–838.
20.
Yeh, G. T., and Tripathi, V. S. ( 1991). “A model for simulating transport of reactive multi-species components: Model development and demonstration.” Water Resour. Res., 27(12), 3075–3094.
Information & Authors
Information
Published In
Journal of Environmental Engineering
Volume 125 • Issue 4 • April 1999
Pages: 314 - 324
History
Received: Jan 21, 1997
Published online: Apr 1, 1999
Published in print: Apr 1999
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