An assessment on dispersion of carbon monoxide from a cement factory
Background: Modeling the dispersion of pollutants from factory stacks addresses the problem of matching
emissions of a cement plant with the capacity of the environment to avoid affecting the environment
and society. The main objective of this study was to simulate the dispersion of carbon monoxide (CO)
from the main stack of a cement plant in Doroud, Iran using SCREEN3 software developed by the US
Environmental Protection Agency (US EPA).
Methods: Four samplings were conducted to measure the concentration of CO in the three-stack flow
of a cement factory. The input parameters were those affecting gas dispersion and included CO rate,
meteorological parameters, factors associated with the stack, and various factors related to the receptor.
All factors were incorporated in the model, and dispersion was modeled by SCREEN3.
Results: Southwesterly winds have been dominant in the past 5 years. According to the results of this
study, the highest and the lowest CO levels were estimated by the model in spring and autumn as having
maximum amounts of 842.06 and 88.31 μg/m3, respectively, within distances of 526 and 960 m from the
cement plant, respectively, at a downwind southwesterly direction from the plant.
Conclusion: Although the maximum predicted CO levels in each of the four seasons were lower than the
NAAQS criteria, the simulation results can be used as a base for reducing CO emissions to prevent the
potentially significant health and environmental impacts imposed by long-term contact to such emissions.
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