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PERSNICKETY® BRAND OXIDIZING & POLISHING MEDIA FOR ODOR CONTROL
 
Oxidizing Catalytic Media
The oxidation of hydrogen sulfide (H2S) by oxygen (O2) is well established. The net reaction is: 6 H2S + 3O2 = 6H2O + 6S (water and elemental sulfur). The rate of oxidation is slow, but a catalyst, which will remain nearly unchanged at the end of the reaction, can accelerate it.

In plain language, H2S and O2 in the air are driven into the moisture that coats the catalytic media. Oxidation by O2 is substantially accelerated electrochemically.

A proper balance of the following critical elements must be achieved for success:
  1. proper catalytic media
  2. surface area of media
  3. H2S concentrations
  4. velocity and residence time

H2S removal rates are affected most by residence time, and can range from 50 to >95 percent. Catalytic media is almost always used as a first-stage media ahead of chlorine dioxide-releasing media.
Oxidizing Chlorine Dioxide-Releasing Media
Chlorine dioxide (ClO2) is an extremely powerful oxidizing agent. For example, one pound of ClO2 is equivalent in oxidation power to 2.5 pounds of chlorine and 3.8 pounds of potassium permanganate. Because it reacts selectively and primarily with only the most offensive odor-producing compounds (H2S, organic sulfurs, organic amines), this media will normally provide a much longer service life than products such as activated carbon, chlorine, hypo chlorite, hydrogen peroxide and potassium permanganate. Unwanted reactions do not occur. Power is not needlessly spent. ClO2 remains available and ready on demand.

In contrast to chlorine and hypochlorite, ClO2 does not react with ammonia and is not a chlorinating agent. It typically reacts with organics as an oxidant and does not form trihalomathanes nor will it form chlorinated by-products. It does not react with water to form hypochlorus and hydrochloric acid, as does chlorine gas. H2S is rapidly oxidized to inorganic sulfate while organic sulfides react to form sulfonyl compounds and oxygen-containing by-products, thus effectively eliminating many odors. Tertiary amines oxidize very rapidly; primary and secondary amines react very slowly or not at all. ClO2 has relatively low oxidizing activity toward olefins. Alcohols and carboxyl compounds react to produce carboxylic acids. The breaking of carbon-carbon bonds is generally not extensive in most reactions.

While all chemical products should be handled with care, here are two points of interest concerning ClO2:
  • Approved by the EPA for use as a primary disinfectant in drinking water. It has shown no adverse effects to human health after decades of use.
  • The proprietary chlorine dioxide and the precursors used in Persnickety media are EPA, FDA and USDA approved for sanitation uses in food and dairy plants.

WARNING Do not add acids or chemicals to this media. There is potential for gas-producing reactions.
Polishing Countervailant® Media
This technology protects against the escape of malodors that cannot be oxidized or readily oxidized. This chemistry is complex and broadly useful. It incorporates neutralization technology, but expands considerably beyond it. Polymeric adsorption is a facet. This involves the building up of malodorous molecules via electrostatic attractions and Van der Waals forces so that they are not recognized for what they are. The process of esterification is also incorporated. Acids and alcohols react to form esters, which normally have a pleasant scent.

There are two versions – one is odorless, the other has a clean “soapy” smell. Both contain only non-reactive, stable materials. All raw materials are listed in the EPA TSCA Chemical Substances Inventory and in the European Economic Community Inventory of Chemical Substances.
Polishing Molecular Sieve Media
This media functions through adsorption and absorption. Its primary target constituent is ammonia. In many situations, ammonia is not present at problematic levels, but when digestion processes are involved ammonia is often present at very high levels. As stated above, ClO2 does not react with ammonia as a chlorinating agent nor as an oxidant. This is a strong positive because this media can remove it at a fraction of the cost of chemical removal. Other nitrogen-based odors are removed as well, such as primary and secondary amines.
TYPICAL APPLICATIONS
  • Peacemaker Oxidizing Dry-Air Scrubbers (Form No. 550)
  • Peacemaker Odor Control Manhole Inserts (Form No. 575)
  • Peacemaker Vent Stack Odor Control Filters (Form No. 576)
  • Replacement for activated carbon, potassium permanganate pellets and any other material found in fixed-bed odor control devices
PHYSICAL DATA
  Catalytic

ClO2

Countervailant®

Molecular Sieve

Appearance

 Black Granules Tan Granules Tan Granules Green Granules

Mesh

 - 3 to + 5, Tyler

Nominal Weight (lbs/ft3)

 55 50 45 55

Odor

 None Slight Chlorine “Soapy” or None None
Packaging 3-1/2 gal. Pails; 30 gal. Drums; Bulk Bags
Shelf Life Indefinite
Storage Store all media in a dry, protected area. Store ClO2 media in a well ventilated area away from acids.
Disposal All expended media can be land filled. Check local regulations for pH restrictions. Media left in place too long can reduce in pH.


Limited Warranty:
Our only obligation shall be to replace or pay for any material proved defective.  Beyond the purchase price of materials supplied by us, we assume no liability for damages of any kind and the user accepts the product "as is" and without warranties, expressed or implied.  The suitability of the product for an intended use shall be solely up to the user.


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