The odor panel tests are double-blind experiments in which people are given measured odorous gases or non-odorous gases to sniff through a machine. As the human nose is very sensitive (and also the ultimate test in odor control) the panel indicates whether people would find the odors offensive or not. The odors are then diluted by the machine to see at what levels it becomes non-offensive.

After running the tests using the destruct stack, Envron found an average decrease in total Amines after 48 seconds contact time of 21%. After 303 seconds an average decrease in total Amines of 59% was found. Everyone at the test site sniffed the gases coming out of the stack with Ozone applied and without Ozone applied. Without Ozone everyone agreed that the gases were odorous. With Ozone everyone agreed that the smell was gone.

The reductions in Amines indicated that within a number of seconds, there should have been a very high reduction in sulphur compounds as well. With the sulphurs gone, the odors should be killed as well. But would the odor panel agree?

After the tests came back from the UBC, the odor panel had indeed confirmed the on-site "sniff" tests. The untreated samples required dilution rates of between 1701-3043, which is typical of odorous substances. The Ozone treated samples were between 209-264, which is typical of non-odorous substances. As well, the treated samples actually smelled like Ozone which has an almost antiseptic or sanitary smell.

These results are consistent with other commercial uses for Ozone. One of the major markets for Ozone generators in North America is sewage lift stations. Odors at lift stations result from anaerobic processes and Ozone kills these odors quite readily. From work in hog and poultry barns, Envron had already seen Ozone’s ability to quickly kill even very penetrating odors.

On of the main principles in applying Ozone is to mix the Ozone with the odorous gases. This can be accomplished in an open air facility through the use of a ventilation system that pushes Ozonated air across the tops of the compost. Or if the composting facility is enclosed, Ozone can be added to the ventilation system at the exhaust. A "destruct stack" can also be added to ensure adequate mixing of the air and the ozone.