Dissipation of fine particulates downwind of broiler houses
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Transcript of Dissipation of fine particulates downwind of broiler houses
Co-authors Casey W Ritz
Poultry Science Dept., University of Georgia
Mike Czarick
Poultry Science Dept., University of Georgia
Brian D Fairchild
Poultry Science Dept., University of Georgia
Luke P Naeher
Env. Health Science Dept., University of Georgia
The Problem Much work has been done on emissions from PH
Much less done on what happens once they leave the house
Previous work on downwind Ammonia
Previous work on PM
Challenge with sensitivity and wind direction
Continuous vs. gravimetric
Objective Measure PM2.5 concentration at various distances
from typical broiler production houses
Measure continuously
Measure daily (gravimetrically)
Compare to “background levels”
Facilities Four tunnel-ventilated broiler houses
July/August 2007
Last 4 weeks of 8-week-old broilers
23,500 birds/house
2-flock built up litter
Instrumentation
Continuous Monitoring
DustTrak 8520 aerosol monitors
15 minute averages –
eliminate if data not available from each distance
Eliminate days with less than 2/3 of data
Gravimetric Monitoring
Triplex Cyclones – EPA procedures
Results - Observations PM levels declined as distance from house increased
No stat. diff. beyond 100 ft from house
Readings above EPA Ambient Air standard of 35 µg/m3 were observed
Background levels were also above standard
Highest days, wind from west – from Athens and metro-Atlanta
Conclusions Background levels of PM were largest influence on
levels
Increased PM levels near the houses
No statistical difference beyond 30m (100 ft.)