Dissipation of fine particulates downwind of broiler houses
http://www.extension.org/67642 Air emissions from animal feeding operations have become a growing concern for producers and their neighbors. Much work has been done to quantify emission rates; however, little information has been provided about air quality downwind from these facilities. This study investigates PM2.5 (particulate matter ≤ 2.5 µm in diameter) levels as they dissipate from the exhaust fans of selected commercial, tunnel-ventilated, broiler houses in Northeast Georgia. PM2.5 was measured in real time using aerosol monitors and from a time-integrated basis using cyclone samplers. Data were taken over the last 4-weeks of a summer flock (considered a worst-case-scenario) and filtered to insure enough data was present at each distance and time. Results indicate a rapid reduction in fine particulate concentration as the distance from the source increases. When compared to nearby monitoring data, particulate levels appear to be near background levels at distances greater than 30 m (100 ft) from the exhaust fans.
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Dissipation of fine particulates downwind of broiler houses
- 2. 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
- 3. 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
- 4. Objective Measure PM2.5 concentration at various distances from typical broiler production houses Measure continuously Measure daily (gravimetrically) Compare to “background levels”
- 5. Facilities
- 6. Facilities PM Sampling Station (30 m from house)
- 7. Facilities PM Sampling Station (30 m from house)
- 8. 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
- 9. Instrumentation - Triplex Cyclone
- 10. Instrumentation – DustTrak 8520
- 11. Instrumentation – Sampling Station
- 12. 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
- 13. Results – Continuous Ambient
- 14. Results – Continuous Downwind
- 15. Daily (Grav. In-house and ambient)
- 18. Results – Avg. by distance (grav)
- 19. 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
- 20. Conclusions Background levels of PM were largest influence on levels Increased PM levels near the houses No statistical difference beyond 30m (100 ft.)