CONTACT:
Rick Jones, Engineered Storage Products Company, Inc., rljones@engstorage.com , 815-756-1551; or,
Jon Anderson, OPEN ROADS, janderson@openroads-bgdn.com, 414-227-1000 ext. 4.
Odor Primary Factor Limiting Livestock Expansion
DES MOINES, Iowa (June 7, 2007) – The number one factor preventing expansion of any livestock operation is odor, whether it be dairy, swine, poultry or beef, said Dr. Dick Nicolai, Associate Professor and Extension Specialist at South Dakota State University.
The good news is that odor shouldn’t stand in the way of establishing or expanding a livestock operation if producers take a scientific approach, use technology such as biofilters and covered manure storage units like a Slurrystore, and develop good community relations.
Dr. Nicolai spoke on “Swine Odor Control Techniques” at World Pork Expo during the Environmental Information Center session on Ag Waste and Nutrient Management, which was sponsored by Engineered Storage Products Company, manufacturers of Slurrystore® systems. Known as the “Father of the Biofilter,” Dr. Nicolai also is president and co-owner of a 1,500-head farrow-to-wean operation new Hector, Minnesota.
Dr. Nicolai lectured on all aspects of odor control in swine -- measuring odor, how odor travels from one point to the next, how it travels through a building, air dispersion and how to enhance it, and techniques to mitigate odor and release.
“The only way to measure odor is the human nose,” said Dr. Nicolai. “There is no instrument to measure odor. That makes odor a subjective measurement more than an objective one, although there are techniques now in place that make the measurement more objective through human training. We need to remove emotion and substitute it with science” when considering if a unit will emit an annoying level of odor detectable by its neighbors.
For his research, Dr. Nicolai employs people trained to detect the “odor threshold” and “odor intensity,” as well as “characteristics” of various odors.
He compares odor detection to turning up the volume on a radio – at first you don’t hear it, then you do – detection – and as the volume increases, so does its intensity until a threshold is reached when it is “too loud” and becomes offensive to others.
Odor management begins with the siting of the facility, Dr. Nicolai explained. Choosing the best location – based on topography, wind and weather patterns, proximity to neighbors, the orientation of the building, etc. – is the first line of defense. “Then, if you still have a problem, you can move into areas such as biofilters, covers on outside storage systems, and other technologies to reduce the amount of emissions.” Dairy and beef manure stored in a Slurrystore will crust over. The unit also has a “chimney effect” that sends odors up into higher air flows where they are less noticeable.
Biofilters for Better Odor Control
“Biofilters have been around since the world was created,” said Dr. Nicolai. “Everyone who lives out in the country and has a drain field on their septic system has a biofilter.”
Sources such as manure, or a dead animal give off volatile organic compounds. Microorganisms in the soil use these compounds as food and convert it to carbon dioxide and water. “Taking that basic principle, we make a bed of wood chips, and we pass the air through this bed and let the microorganisms do their thing.”
A horizontal biofilter, for example, is outside the facility adjacent to the exhaust fans of the building. The exhaust air is directed down to an air plenum beneath a 14 to 20 inch deep bed of wood chips, which may be 30 feet wide by the length of the building. Underneath the wood chip bed may be shipping pallets, for instance, for an air plenum and support. The air is passed through the wood chips coated with microorganisms living in a water biofilm on each chip.
As the air passes through the wood chips, it is absorbed into the biofilm, degasses, and the microorganisms then process the biomatter to give off carbon dioxide and water. “The entire structure is relatively inexpensive,” Dr. Nicolai said. “It is very effective when maintained properly, and you get 80 to 95 percent odor reduction.”
The basics of swine biofiltration can be found at the SDSU web site at: http://maverick.sdstate.edu/users/nicolaid/Biofilters/Biofilter%20Design%20Spreadsheet.xls
Steps Swine Producers Can Take About Odor When Expanding
“There are several steps a producer can take when expanding a livestock operation where odor may be a concern,” Dr. Nicolai continued. They are:
* Community Relations. Build rapport with your neighbors. Do not allow there to be any surprises. Don’t wait for the zoning meeting, visit with your neighbors one-on-one.
* Do Odor Modeling. Dr. Nicolai has developed an evaluative model to predict the impact of odor on neighbors before seeking a permit. The model is a tool that he helped develop while at the State of Minnesota as an agricultural engineer. The model is now available in South Dakota, Minnesota and Nebraska for every county, based on weather, topography, type of livestock, type of facility, manure handling and other inputs. The model predicts how far away one must be to be “98 percent annoyance-free.” The model utilizes information from Environmental Protection Agency standards for smoke stack emissions. Other states have similar models.
* Use the model when visiting neighbors to show how they will be impacted, based upon science.
“The odor issue is solvable,” Dr. Nicolai concluded. “It does not have to be a hindrance. There are technologies out there. We are continuing to develop new technologies to mitigate the odor.
“If you are half-way savvy with community relations, you should not have a problem.”
