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PERSISTENCE: ODOUR INTENSITY AND CONCENTRATION RELATIONSHIP FOR LIVESTOCK ODOURS

Published by the American Society of Agricultural and Biological Engineers, St. Joseph, Michigan www.asabe.org

Citation:   No Citation available.
Authors:   C A Ouellette, J C Segura, J.J.R Feddes

Odour persistence is a measure of the relative change in odour intensity to the number of odour dilutions. Odour intensity of a non-diluted source is measured by comparing an n-butanol concentration to the odour source using a recognized Odour Intensity Referencing Scale (OIRS). In a previous study, the n-butanol intensity as described by the OIRS protocol was related to concentration (OU/m3) by an olfactometer. The objective of this study was to measure odour persistence from 8 odour sources: broiler manure; layer manure; dairy manure; swine manure; exhaust air from a pig gestation, nursery, and finisher facilities and artificial livestock odour (ALO). Persistence values ranged between -0.87 for stored swine manure to -1.86 for a prepared Artificial Livestock Odour. The higher persistence values appear to be associated with sulphur-containing compounds in the source. Swine odours and dairy manure odour were the most persistent. Odour dispersion models need to include persistence values to determine MDS values. The persistence of n-butanol is similar to that of the exhaust air from a finisher barn.

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