You have been asked by an environmental advocacy group to help them determine wh

Question

You have been asked by an environmental advocacy group to help them determine whether a proposed new power plant would be expected to have a greater or lower impact on air quality than an existing plant it is proposed to replace. The original plant had a flow rate of 250,000 acfm, a stack height and diameter of 300 feet and 12 feet respectively and a PM_omega emission rate of 6 g/s. The new plant will have a flow rate of 300,000 acfm, a stack height and diameter of 60 feet and 10 feet respectively, and a PM_10 emission rate of 0.5 g/s. The neighborhood that the environmental group is concerned about is located approximately 1000 feet from both stack locations. You have consulted with a meteorologist and determined that representative dispersion coefficients of sigma_gamma = 200 ft and sigma_x = 70 ft are appropriate for this location. Find the ground-level concentration of PM_10 that is expected to be caused by operation of each plant in the neighborhood assuming it is located along the centerline of the plume and there is no reflection. Which plant is expected to have a more negative impact on PM_10 concentrations?

Explanation / Answer

The emissions from point sources at LPS are very important for impact assessment while these sources are reasonably significant, continual naturally in addition to are released from greater levels previously mentioned floor level. The particular influences on air environment from stacks depend on the quality of lignite used and may extend to be able to far distances depending on predominant meteorological conditions. The fugitive emissions are commonly less inside sum and it is introduced somewhat nearer to walk out then may cause impact within the quick locality to be able to very limited distances (about 1-3 km). Among the continual level source emissions, PM10, SO2 and NOx will constitute perfect worry as is also provided inside significant sum according to the type of lignite/coal used in addition to proficiency with the actual environment handle equipment. In relation to the fugitive emissions, the main pollutant needed to be considered can be coal dust out of unique sources.

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