The reduction of the odour concentration or the odour flow rate due to an abatement technique expressed as a fraction (or percentage) of the odour concentration in or the odour flow rate of the untreated gas stream.

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Mixing of odorous gas and odour-neutral air measured by flow rate. The consistent introduction of odour-free or odour-neutral air to a concentrated amount of an odorous gas allows for accurate measurement when determining the severity of the odour’s concentration and intensity.

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Determines the odour concentration per time and area (flux).  It is calculated by taking the product of the odour concentration and flow rate inside a sampling hood, divided by the area of the hood used to perform the measurement.  The area represents a ‘hood’ covering over the source such as a wind tunnel or static flux hood. 

Example

if a pond (passive area source) has an odour concentration after olfactometry analysis of 500OU/m3, the flow rate of neutral gas into the static flux hood was 2L/min (0.002m3/min) and the area of the static flux hood covering the surface is 0.6m2, then:
SOER = (500OU/m3 * 0.002m3/min)/0.6m2 = 1.67OU/m2/min

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A ratio of diluting neutral gas to odorous sample gas.  According to ASTM E679, this is a ratio of diluting gas to the odour sample. According to EN13725, this is a ratio of the sum of the diluting gas and odour sample, to the odour sample.  It is calculated based on the flow rate.

Example

5 parts of diluting air to 1 part of sample

ASTM E679:  Diluting gas/odourous sample = 5:1 = 5

EN 13725:  (diluting gas + odourous sample)/odourous sample = 6:1 = 6

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