SUITMA 2005 Cairo - A deposition model of heavy metal laden dust particles on soil from multiple point industrial sources
SUITMA 2005 Cairo
| This abstract is about one of the papers of the Methodology and classification theme of the SUITMA 2005 symposium. |
| Rushdi M. M. El-Kilani,i | Mohammed Helmy Belal.ii |
- i - Soil Science Department, Cairo University, Giza, Egypt
- ii - Pesticides Department, Cairo University, Giza, Egypt.
The prediction of the pollution load on the ecosystem due to the deposition of heavy metal laden dust particles, emitted from industrial sources, on vegetation and the soil and the consequent transport of the deposited heavy metals through the soil or its accumulation in the upper surface of soil, is of paramount importance for the sustainable management of our limited eco-resources.
In this paper, we present a model for coupling the pollutant, as emitted from near field and far field sources to the deposition of these pollutants on the soil or vegetation and its latter movement through the soil profile. The aim of the model is to be able to predict the accumulation of heavy metals in the soil due to a certain pollution load. The presented model is a coupling between three models, an air pollution model, a model of energy exchange of vegetation-soil system and the and a heavy metal transport in soil model in an attempt to predict the transport and fate of heavy metals from source to receptor.
The air pollution model uses the gaussian model approach, superimposed for multiple emission sources, for considering the deposition of the different heavy metals laden, air carried, particulates on the soil surface. The model calculates for a 10 X 10 km grid with a resolution of 50 m with a large number of point sources (industrial or traffic).
The canopy model uses a detailed canopy model for predicting the interception of the laden particles on the vegetation surface and its probable deposition on the soil surface. It simulates the effect of the meteorological condition with and above the canopy on soil evaporation and water fluxes between different soil layers. The canopy model is well validated from a previous study.
Once the heavy metal laden particles reach the soil surface, use is made of a heavy metal transport in soil model which uses a Kd (distribution coefficient) approach between the solid and the liquid phases of the soil to predict the transport and accumulation of the deposited heavy metals on the soil surface. The Pollutant -in-soil transport model solves the convection dispersion equation for the chemical species considered.
To obtain the parameters of the models, kinetic adsorption experiments were carried out on the clayey alluvial soils of the delta and the valley to obtain a kinetic description of the distribution coefficients.
Two case studies for the use of the coupled model will be shown and sensitivity analysis will be done to show the effect of different parameters on the model results.
