Modeling of particulate matter dispersion from a poultry facility using AERMOD

Area of Science:

• Environmental Science
• Atmospheric Chemistry
• Air Quality Modeling

Background:

• Poultry facilities are significant sources of airborne particulate matter (PM).
• Accurate dispersion modeling is crucial for assessing environmental impact and regulatory compliance.
• The AERMOD model is the U.S. EPA's standard for air quality dispersion.

Purpose of the Study:

• To evaluate the performance of the AERMOD model in simulating PM10 and PM2.5 dispersion from a poultry pullet facility.
• To assess the accuracy of AERMOD predictions against measured particulate matter concentrations.
• To determine if predicted PM concentrations near the facility comply with National Ambient Air Quality Standards.

Main Methods:

• Utilized AERMOD, a U.S. EPA regulatory dispersion model.
• Estimated daily mean PM10 and PM2.5 concentrations and emission rates at the source.
• Compared modeled hourly and daily average PM concentrations with measured data downwind.
• Analyzed simulation results for PM concentrations at and beyond the facility's property line.

Main Results:

• Estimated source emission rates for PM10 and PM2.5 were 0.067-0.073 g sec⁻¹ and 0.044-0.047 g sec⁻¹, respectively.
• Modeled PM concentrations demonstrated acceptable accuracy compared to measured downwind concentrations.
• Prediction accuracy improved with longer averaging periods (daily vs. hourly).
• Simulated PM concentrations were within National Ambient Air Quality Standards at and beyond the property line.

Conclusions:

• AERMOD is effective for predicting particulate matter dispersion from poultry facilities.
• The model accurately assesses the downwind air quality impacts of poultry operations.
• Compliance with air quality standards is indicated for the studied facility and surrounding areas.