critical problems in ecology Dynamics

Petrochemical companies especially those with olefin plant have a considerable negative effect on air quality, environment and people health. Therefore, measurement of emission rates of pollutants and their dispersion is required to determine policies and restrictions on pollutant emissions. In this investigation, the concentrations of some perilous pollutants such as CO, NOx and SO2 from seven active stacks of an olefin plant for all seasons of a year were measured. This olefin plant is located in one of the most important industrial centers in south of Iran called Petrochemical Special Economic Zone (PSEZ). Moreover, in all residential areas near the PSEZ, AERMOD model and WRF model were utilized for dispersion modeling and predicating the concentration of pollutants released in atmosphere from the stacks. Measurement results showed that the highest amount of pollutant emitted by the stack is NOx, and as a result, the emission rates of NOx in different seasons are significantly higher than the emission rates of CO and SO2. Moreover, according to the dispersion modeling and meteorological data, the direction of movement and development of concentration contours are toward the southwest and against the direction of residential areas. This is due to the prevailing wind directions in all seasons. Finally, in comparison with WHO (World Health Organization) air quality guideline values, the concentration of CO and SO2 was higher than the guideline values in Sarbandar in summer, fall and winter seasons as a consequence of short distance between this residential area and the sources of pollutants emission. Also, the concentration of NOx is considerably higher than the guideline values in the all residential areas during a year.

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