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Author(s): Jacobson, Larry, Schmidt, David, Nicolai, Richard, Bicudo, Jose
Publication Date: January 1, 1998
Reference: Jacobson, Larry, Schmidt, David, Nicolai, Richard, Bicudo, Jose (1998). Odor Control for Animal Agriculture. University of Minnesota Extension Program; BAEU-17.
Country: United States


Odour generation, emissions, and movement are very complicated processes. Several technologies can significantly reduce odours from livestock production but can range in the simplicity, maintenance and price. This document reviews many odour control technologies, some that have been rigorously tested and other that have yet to be evaluated but are generally accepted by some engineers and/or producers.
There is the option of reducing odour during land application. This can be done through injection or immediate incorporation of the manure into the soil. Another aspect of manure application is the agitation of liquid manure storage facilities. Pit additives are the odour control method most often used in these situations. There is the option of reducing odours during the manure storage period as well by adding a cover. There are gas impermeable covers that capture gases, which are then treated, or permeable covers, which simply decrease the amount of emissions into the air. Anaerobic digestion and aeration are also methods of reducing odours during storage.
There are odour reduction practices for buildings as well. The best method appears to be the elimination of the source of odour rather than the treating of it afterwards. This can be done through diet manipulation, keeping the building clean and sprinkling vegetable oils in swine pens. After odours are created, it is possible to reduce them through ventilation in the buildings and by using biofilters.
Odour management plans, part of manure management plans are becoming standard practice. They would list odour sources, odour potential and control strategies. These plans may serve to diffuse some of the controversies between producers and their neighbours by directing the discussion to strategies and practices.

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