Abstract
Air dispersion modeling of SOx and NOx emissions from a petroleum refinery was performed using the software ISC3. Monthly emissions data were obtained indirectly from calculations based on mass balance, emission factors and laboratory analysis of fuels; terrain information from the refinery’s plot plan, aerial photographs, and elevation contour maps; and weather data from refinery’s local weather station were used as inputs to create a one-year dispersion study of these pollutants. Ambient air concentration contour maps were created to illustrate the dispersion of these pollutants on a monthly basis. The dispersion modeling had shown that seasonal monsoon winds impacted on the dispersion of these pollutants inland. The modeling predicted the locations where the highest concentrations of these pollutants might occur. It also showed that predicted values go beyond the Ambient Air Quality Guideline of 180 mg/Ncm for SOx at 50 m above sea level. The model reported maximum 24-hr averaging period for SOx and NOx ranging from 800 to 1360 mg/Ncm and 2.0 to 3.6 mg/Ncm respectively.
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