Study on Release and Pollution of Waste Pollutants under the Condition of Rainfall

To study the release law of waste pollutant comprehensively and systematically, and analyze transporting law of
pollutant and predict its distribution scientifically, the main pollutants of waste leachate were studies, including
the release mechanism of COD, Cl-, SO4
2-, and total hardness, etc. by the dynamic dissolution experiment,
according to the practical rainfall of Fuxin city. The results showed that Cl- and COD have the most fast and
slow transporting speed. The simulation was carried out by combining the COD decreasing curve fitting
equations, which was considered as source sink term, and the established underground water dissolution
transporting mathematical model. The result showed that, in the center of landfill, the simulated curve is accord
with the COD experiment curve, and the result faithfully reflects the transporting law of pollutants. The model
can provide the theoretical basis for the prediction of pollution of underground water by waste pollutant and its
prevention and control.