New Odor Sampling Procedure for high humidity air flow from food or feed dryers/coolers


Source: Uniqair Technologies Ltd.

Special odor sampling procedure with nitrogen dilution has been developed by Uniqair and Purdue University Odor Lab for odor samples with high humidity from dryers and coolers. The nitrogen will preserve the odor and prevent condensation for more accurate odor concentration test results. Unlike VOC testing, the odor lab is utilizing human noses of screened panel members with odor sensing capabilities that reflect the average person according the latest ASTM and CEN odor testing standards.

Odor samples are diluted until detection threshold; the required number of dilution is the odor concentration: DT (Detection Threshold) or ou/m3 (Odor Units per cubic meter). Some food or feed processes with high fat and protein content can have high odor concentrations in the (untreated) air from the dryers of 100,000 DT or ou/m3. This means it needs a stack dilution of 100,000 to ground level. But for example fish feed generally has even more odor, so for fish feed a Plasma-Injector with more energy capacity is applied to oxidize these odors. Most countries/states now recognize the latest European CEN- 13725 odor standards and cold plasma odor oxidation for feed and food dryer stack odor control

Plasma-Injector stack odor oxidation process (

Odor evaluation: odor concentration at ground level before/after treatment:

Please visit us at the upcoming trade shows for the food, feed and Petfood industry:
- IPPE Atlanta, at booth# 3120, January 28-30, 2014.
- Petfood Forum Chicago, booth# 308, March 31 – April 3, 2014.
- VICTAM Bangkok, Thailand, booth# C053, April 8-10, 2014.

Uniqair Technologies Ltd (BC-Canada):
We are the originators of advanced high frequency cold plasma injection odor control systems for stack emissions. Unlike incinerators, chemical- or water scrubbers or bio-systems, the PLASMA-INJECTORTM is an oxidizer that does not need any chemicals or water and does not generate any waste.

Our experience includes over 100 systems for stack odor control: dryers of Petfood, fish feed, etc. Plasma-Injector: a compact cold plasma-injection technology, selected as Best Available Technology in Europe, Asia and N-America. The Plasma-Injector is oxidizing odors instantly with oxygen radical injection from ambient air; for example 12,000 cfm (20,000 m3/h) with only 6 to 9kW energy consumption. Simple on/off control. See or for more info.

Purdue University (IN - USA)
The Purdue Agricultural Air Quality Laboratory (PAAQL) is part of the Department of Agricultural and Biological Engineering at Purdue University, West Lafayette, Indiana, USA. The PAAQL specializes in odor assessment using field and laboratory olfactometry, chemical analyses using gas chromatographymass spectrometry with olfactory sensing (GC-MS-O), ion chromatography, closed-cell FTIR spectrometry, and continuous emissions monitoring of ammonia, hydrogen sulfide, carbon dioxide, methane, nitrous oxide, ethanol, methanol and particulate matter. PAAQL personnel have been studying the science and engineering of odor, gas, and dust emissions since January of 1994. Our research has served industry, government and agribusiness, in addition to communities at large.

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