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Dick Nicolai, Ph.D.John Ball, Ph.D.
Brett Hofer, Graduate Assistant
Effect of Shelterbelts on H2S Emissions from Swine Barns
Wind Speed at Shelterbelt
Van Eimern et al. 1964
1 to 4 mph Wind
Shelterbelts Create an
Obstacle for Moving Air
Air Quality Education in Animal Agriculture Webcast SeriesPresented by the Livestock and Poultry Environmental Learning Center
February 26, 2010
The archived presentation is available at:http://www.extension.org/pages/Mitigating_Air_Emissions_with_Vegetative_Environmental_Buffers
Interactions to Manage Dust and Odors
1. Prevent odors and dust particles from being picked up by wind
2. Encourage deposition of dust particles that transport odors
3. Intercept and filter odors and dust particles already airborne
4. Disperse and dilute odors
11
2
4
3
Shelterbelt Effect on Odor
Lin and Barrington, 2008
SimulatedMeasured
Windbreak Effect on Odor vs. Distance from Modeling
Distance
Odo
r In
tens
ity
No Windbreak
WindBreak
Unpublished reportTaylor, J. and Starke, G. 2005Pacific Air & Environment Pty Ltd
Air Quality Education in Animal Agriculture Webcast SeriesPresented by the Livestock and Poultry Environmental Learning Center
February 26, 2010
The archived presentation is available at:http://www.extension.org/pages/Mitigating_Air_Emissions_with_Vegetative_Environmental_Buffers
ObjectiveDetermine effect a shelterbelt has on H2S
dispersion.– Determine effect of shelterbelt porosity– Compare dispersion by stability class
W
Hog Barn (South)
Hog Barn (North)
P P
500'
400'
200'
41'
207'
Road
142'
87'
15' 50'
90'
P
Propertyline
Summer Plume line
372'
210'
800'
250'
P P P P P P P P P P P P
PP
PP
PP
PP
712' 790'
75'Grass Waterway
SPM MonitorsAccuracy + 2 ppb
Air Quality Education in Animal Agriculture Webcast SeriesPresented by the Livestock and Poultry Environmental Learning Center
February 26, 2010
The archived presentation is available at:http://www.extension.org/pages/Mitigating_Air_Emissions_with_Vegetative_Environmental_Buffers
1st Row of Trees
Two Rows of Trees
Air Quality Education in Animal Agriculture Webcast SeriesPresented by the Livestock and Poultry Environmental Learning Center
February 26, 2010
The archived presentation is available at:http://www.extension.org/pages/Mitigating_Air_Emissions_with_Vegetative_Environmental_Buffers
Three Rows of Trees
One Row 84% Porous
Two Rows 51% Porous
Three Rows 38% Porous
Porosity
Stability ClassPasquill-Gifford stability categories
– Class A = very unstable– Class B = unstable– Class C = slightly unstable– Class D = neutral– Class E = slightly stable– Class F = stable
Based on cloud cover, wind speed, air temperature, and solar radiation
Air Quality Education in Animal Agriculture Webcast SeriesPresented by the Livestock and Poultry Environmental Learning Center
February 26, 2010
The archived presentation is available at:http://www.extension.org/pages/Mitigating_Air_Emissions_with_Vegetative_Environmental_Buffers
Stability Classes
Without Shelterbelt
• Source ConcentrationsAB: 275 ppbCD: 275 ppbEF: 92 ppb
One Row of Trees
• Source ConcentrationsAB: 101 ppbCD: 133 ppbEF: 250 ppb
Air Quality Education in Animal Agriculture Webcast SeriesPresented by the Livestock and Poultry Environmental Learning Center
February 26, 2010
The archived presentation is available at:http://www.extension.org/pages/Mitigating_Air_Emissions_with_Vegetative_Environmental_Buffers
Three Rows of Trees
• Source ConcentrationsAB: 141 ppbCD: 122 ppbEF: 345 ppb
• Source ConcentrationsNo windbreak: 92 ppb
1 tree row: 250 ppb
2 tree rows: 70 ppb
3 tree rows: 250 ppb
Conclusions
Effect on hydrogen sulfide concentrations• Most effective reduction occurs just
beyond the shelterbelt.– After 500 meters (~ ¼ mile) very little effect
of the shelterbelt was observed.• Atmospheric stability affects dispersion.
Air Quality Education in Animal Agriculture Webcast SeriesPresented by the Livestock and Poultry Environmental Learning Center
February 26, 2010
The archived presentation is available at:http://www.extension.org/pages/Mitigating_Air_Emissions_with_Vegetative_Environmental_Buffers
RecommendationFor odor reduction, the most effective
location for a shelterbelt may be near the recipient.
Recommendation
For odor reduction, the most effective location for a shelterbelt may be near the recipient.
Acknowledgements
• South Dakota Pork Producers
• Brookings County Conservation District
• Moody County Conservation District
• Nebraska Corn Board
Air Quality Education in Animal Agriculture Webcast SeriesPresented by the Livestock and Poultry Environmental Learning Center
February 26, 2010
The archived presentation is available at:http://www.extension.org/pages/Mitigating_Air_Emissions_with_Vegetative_Environmental_Buffers
Next Step
SDOFT South Dakota Odor Footprint
Tool
Questions ???
Contact Information
Dr. Dick Nicolai605-688-5663
Air Quality Education in Animal Agriculture Webcast SeriesPresented by the Livestock and Poultry Environmental Learning Center
February 26, 2010
The archived presentation is available at:http://www.extension.org/pages/Mitigating_Air_Emissions_with_Vegetative_Environmental_Buffers
