Contamination transport into saturated land upon advection-diffusionsorption including decay

Document Type : Research


1 professor ,Department of Civil Engineering, K.N. Toosi University of Technology, Tehran, Iran

2 Assistant Professor, Department of Civil Engineering, K.N. Toosi University of Technology, Tehran, Iran


The objective of this paper is to describe governing numerical equation and solution algorithm of pollution transport mechanisms and factors essential to include in developing relatively simple and practical tools to quantify pollution loss, advection, diffusion and sorption in pollution transport into the groundwater at landfill sites. This paper presents the development of a numerical model that can be used for quantifying groundwater inputs and associated contaminant discharge from a landfill into the affected aquifer. The results reveal that the proposed model can be used for the simulation of contaminant transport in aquifers in any scale. This numerical solution is established on finite difference-finite-volume solution advection-diffusion-linear sorption with first order decay equation. To show the capability of proposed model, the results of a case study presented in the paper as simulating leachate transport at a 2000 ton/day landfill facility assesses leachate migration away from the landfill in order to control associated environmental impacts, particularly on groundwater wells down gradient of the site. Leachate discharge from landfills is the main route for release of the organic and inorganic contaminants through subsurface, commonly encountered in the refuse. Leachate quantity and potential percolation into the subsurface are estimated by the proposed model. A comprehensive sensitivity analysis to leachate transport control parameters was also conducted. Sensitivity analysis suggest that changes in source strength, aquifer hydraulic conductivity, and dispersivity have the most significant impact on model output indicating that these parameters should be carefully selected when similar modeling studies are performed. The sensitivity of the model to variations in input parameters results in two opposing patterns of contaminant concentration. While higher groundwater velocities increase the speed of plume spread, they also increase the dilution ratio and hence Decrease the concentration.


1. Ataie-Ashtiani B, Lockington DA, Volker RE. Truncation errors in finite difference models for solute transport equation with firstorder reaction. J Contam Hydrol 1999;35:409-28. [DOI:10.1016/S0169-7722(98)00106-5]
2. Moldrup P, Kruse CW, Yamaguchi T, Rolston DE. Modelling diffusion and reaction in soils: I. A diffusion and reaction corrected finite difference calculation scheme. Soil Sci 1996;161:347-54. [DOI:10.1097/00010694-199606000-00001]
3. Stanbro WD. Modeling the interaction of peroxynitrite in lowdensity lipoprotein particles. J Theor Biol 2000;205:465-71. [DOI:10.1006/jtbi.2000.2080]
4. Sheu TWH, Wang SK, Lin RK. An implicit scheme for solving the advection-diffusion-reaction equation in two dimensions. J Comput Phys 2000;164:123-42. [DOI:10.1006/jcph.2000.6588]
5. Zheng C. MT3D: A modular three-dimensional transport model for simulation of advection, dispersion and chemical reactions of contaminant in groundwater systems. Report to US Environmental Protection Agency, 1990.
6. Noye BJ. A new third-order finite-difference method for transient one-dimensional advection-diffusion. Commun Appl Numer Meth 1990;6:279-88. [DOI:10.1002/cnm.1630060405]
7. Hossain MA, Yonge DR. On Galerkin models for transport in ground water. Appl Math Comput 1999;100:249-63. [DOI:10.1016/S0096-3003(98)00025-3]
8. Liu B, Allen MB, Kojouharov H, Chen B. Finite-element solution of reaction-diffusion equations with advection, computational methods in water resources. Computational methods in subsurface flow and transport problems, vol. XI. Computational Mechanics Publications; 1996.
9. Sheu TWH, Chen YH. Finite element analysis of contaminant transport in groundwater. Appl Math Comput 2002;127:23-43. [DOI:10.1016/S0096-3003(00)00160-0]
10. Zheng, C., Bennett, G.D., 2002. Applied Contaminant Transport Modeling, second ed. Wiley, New York.
11. Albaiges, J., Casado, F., Ventura, F., 1986. Organic indicators of groundwater pollution by a sanitary landfill. Water Research 20, 1153-1159. [DOI:10.1016/0043-1354(86)90062-X]
12. Dunlap, W.J., Shew, D.C., Robertson, J.M., Tossaint, C.R., 1976. Organics pollutants contributed to groundwater by a landfill. In: Genetelli, E.J., Cirello, J. (Eds.), Gas and Leachate from Landfill: Formation, Collection, and Treatment. EPA-600-9-76-004.
13. El-Fadel, M., Findikakis, A., Leckie, J., 1997a. Environmental impacts of solid waste landfilling. Journal of Environmental Management 50 (1), 1-25. [DOI:10.1006/jema.1995.0131]
14. Garland, G., Mosher, D., 1975. Leachate effects from improper land disposal. Waste Age 6, 42-48.
15. MacFarlane, D.S., Cherry, J.A., Gillham, R.W., Sudicky, E.A., 1983. Migration of contaminants in groundwater at a landfill: a case study. Journal of Hydrology 63, 1-29. [DOI:10.1016/0022-1694(83)90221-4]
16. Malina, G., Szczypior, B., Ploszaj, J., Rosinska, A., 1999. Impact on ground water quality from sanitary landfills in Czestochowa region-Poland: a case study. In: Christensen, T.H., Cossu, R., Stegman, R. (Eds.), Sardinia 99: Seventh Waste Management and Landfill Symposium, vol IV, 4-8 October, Cagliary, Sardinia, Italy. CISA Environmental Sanitary Engineering Center, Cagliary.
17. Reinhard, M., Goodman, N.L., Barker, J.F., 1984. Occurrence and distribution of organic chemicals in landfill leachate plumes. Environmental Science and Technology 18, 953-961. [DOI:10.1021/es00130a011]
18. Zanoni, A.E., 1972. Ground water pollution and sanitary landfills - a critical review. Ground Water 10, 3-13. [DOI:10.1111/j.1745-6584.1972.tb02895.x]
19. El-Fadel, M., Findikakis, A., Leckie, J., 1997b. Modeling leachate generation and transport an solid waste landfills. Environmental Technology 18, 669-686. [DOI:10.1080/09593331808616586]
20. Bou-Zeid, E., EI-Fadel, M., 2004, Parametric sensitivity analysis of leachate transport simulations at landfills, Waste Management 24 (2004) 681-689. [DOI:10.1016/j.wasman.2004.03.004]
21. Kruempelbeck, I., Ehrig, H.J., 1999. Long-term behavior of municipal solid waste landfills in Germany. In: Christensen, T.H., Cossu, R., Stegman, R. (Eds.), Sardinia 99: Seventh Waste Management and Landfill Symposium, vol. I, 4-8 October, Cagliary, Sardinia, Italy. CISA Environmental Sanitary Engineering Center, Cagliary, 1999.