[CFD modeling of particulate matter dispersion from Kerman cement plant]

The dispersion of particulate matter has been known as the most serious environmental pollution of cement plants. In the present work, dispersion of the particulate matter from stack of Kerman Cement Plant was investigated using Computational Fluid Dynamics [CFD] modeling. In order to study the dispersion of particulate matter from the stack, a calculation domain with dimensions of 8000m X 800m X 400m was considered. The domain was divided to 936781 tetrahedral control volumes. The mixture two-phase model was employed to model the interaction of the particulate matter [dispersed phase] and air [continuous phase]. The Large Eddy Simulation [LES] method was used for turbulence modeling. The concentration of particulate matter in the whole calculation domain was computed. The predicted concentrations were compared to the measured values from the literature and a good agreement was observed. The predicted concentration profiles at different cross sections were analyzed. The results of the present work showed that CFD is a useful tool for understanding the dispersion of particulate matter in air. Although the obtained results were promising, more investigations on the properties of the dispersed phase, turbulent parameters and the boundary layer effect is needed to obtain more accurate results

[Use of analytical hierarchy process model [AHP] in landfill site selection of semnan town]

Landfill site selection is an important action in integrated solid waste management process. Difference criteria should be paid attention in site selection, so using of special methods are necessary to assimilate the criteria. In this research, GIS software and Analytical Hierarchy Process were used. First of all, maps were built in considering to economical, social and environmental factors, in next step, each layer, was graded. Low grade showed non coordination or less coordination and high grade showed more coordination. Assimilate of graded map in AHP process, separates area into unsuitable, suitable and very suitable parts. Very suitable parts can have high priority in decision making and also suitable parts can have high priority for development projects in future