South Dakota Odor Footprint Tool Dick Nicolai, Ph.D., Erin Cortus, Ph.D., P.E. and Bob Thaler, Ph.D. South Dakota State University
South DakotaOdor Footprint Tool
Dick Nicolai, Ph.D., Erin Cortus, Ph.D., P.E. and Bob Thaler, Ph.D.South Dakota State University
Airborne Emission Sources StorageHousing
Land Application
Factors Affecting Release and Dispersion
3. Source concentration
2. Area
1. Wind speed
1. Temperature2. Wind speed3. Topography
History of Odor Setback Tools• Desire for a science-based model to establish
setback distances from animal production sites• OFFSET – developed for Minnesota
• Odor emissions gathered from 85 farms in Minnesota (1998 to 2001)
• Odor plumes measured by trained field assessors and trained resident observers
• Measured data checked against dispersion model• Historical frequency of favorable weather conditions for
odor transport identified• Odor mitigation strategies
History of SDOFT• Uses similar principle to
OFFSET• Same odor emission
values• Different dispersion model
• Historical weather data by region, April through October
• Recent work has considered impact of shelterbelts
A rea 1
A rea 2
A rea 3
Wind Rosettes for Brookings County
What is a Footprint?• Shown through annoyance-free frequency curves during warm
weather
• Annoyance-free does not mean odor free. Annoyance-free means the odor intensity is a 2, on a scale of 0-5, for which the majority of the population would not find annoying
• SDOFT does not take into account all of the impacts topography and site-specific features (like animal diet and management) can have on the odor footprint for a particulate site
• Provides a starting point for investigating the odor impact
Limitations• Barn design and feeding programs change over
time• Odor emission data is costly and time-consuming to
collect• Science-based estimate• Management is key after the farm is constructed
and populated
Starting Point for Discussion!
% Annoyance-Free verses Distance
Radial Data
0.0 0.5 1.0 1.5 2.0 2.50.0
0.5
1.0
1.5
2.0
2.5
0.00.51.01.52.02.50.0
0.5
1.0
1.5
2.0
2.5
98% No Odor Control94% No Odor Control98% with Biofilter and Deep Pit94% with Biofilter and Deep Pit
North
West East
South
-97.190 E 43.157 S
-97.190 E 43.157 S
-97.190 E 43.157 S
Clark County ColonyGestation Barn 80 X 430
Farrowing Barn 100 X 175Nursery Barn 80 X 243
Finishing Barn (2) 101 X 412