  Solid waste disposal in a landfill causes leachate production whose discharge
to soil layers carries soil and leachate contaminants to the groundwater. A
landfill with a capacity of 3000 ton/day and an area of 0.5 square kilometers
is studied to assess and control the environmental impacts of leachate
discharge on the inner layers of soil. An analytical calculation is performed,
a numerical model under two different boundary conditions is developed, and
their outcomes are compared to the experimental values. The landfill data is
used for programming and a finite element modelling is applied. The variables
considered in the model are time steps and diffusion coefficient. Results
obtained from numerical computations were compared with the experimental
values. The comparison demonstrates a good agreement between experimental and
numerical calculations. This model can be used at fields for the landfills to
simulate transport of different types of ions available in the leachates in any
scale.
