REMOVAL OF ANIMAL ODORS AT ZOO'S AND VETERINARY OFFICES
The odors caused by fecal material and excretions from animals are best handled by a combination of HS-600 and activated carbon. The odors can be identified as indole and skatole, which are best adsorbed by activated carbon. Other compounds generated are amines and other nitrogen containing compounds.
These items are not adsorbed by activated carbon and require the oxidative properties of HS-600. The potassium permanganate media oxidizes these materials and holds the resulting compounds in the pore structure of the HS-600.
Other compounds found in these spaces for disinfecting the space include aldehydes and/or ketones. These compounds contain a carbonyl group. The type of carbonyl group and size of the compound will determine what type of gas phase filter media should be used to remove the pollutant. Aldehydes are quite easily oxidized whereas ketones are oxidized only with difficulty. Aldehydes are compounds like formaldehyde, acetaldehyde, benzaldehyde and tolualdehyde.
All of these compounds are oxidized by HS-600 none noxious chemicals. Standard activated carbon will also do a good job of adsorbing the large aldehydes, (benzaldehyde and tolualdehyde), but the small aldehydes (formaldehyde and acetaldehyde are not adsorbed well. Activated carbon will easily adsorb the large molecular weight ketones. This is the reason a mixture of the two materials is suggested.
The relative humidity found in these spaces is quite high, greater than 60%. When the activated carbon is subjected to this high humidity, its' pore structure becomes filled with water. With increasing humidity, the activated carbon will become less effective in removing pollutants. This is not the case with the potassium permanganate impregnated media, as it requires humid environment.
Based upon these reasons it is best to use a separate pass or mixture of HS-600 and activated carbon.