Updated: July 2002

1. Outline

Odorgard^TM Process is a chemical scrubbing system by means of catalytic oxidation that was developed by the ICI Chemicals & Polymers Limited. In 1999, Mitsubishi Kakoki Kaisha (MKK) concluded a license contract with ICI to start selling their systems.
Its method for scrubbing is the same as the traditional ones', which is to use sodium hypochlorite to decompose odour components. However, its biggest characteristic is that Odorgard^TM catalysts can effectively decompose and remove such odour components in the circulating fluid with only one deodorization tower being used.

Odorgard^TM Process consist of fans, a deodorization tower, circulating pumps, an Odorgard reactor and chemicals supply facilities. Odour components that are absorbed and removed in the deodorization tower are sent to the Odorgard reactor through the circulating pumps. At the reactors, a catalyst converts the hypochlorite molecule into brine and a highly reactive oxygen atom held on the surface of the catalyst. The reaction which takes place over the catalyst can be summarized thus:

NaClO+Catalyst -> NaCl+Catalyst ----- O
                     Highly reactive Oxygen atom

The circulating fluid is sent back to the deodorization tower but does not contain odour components any longer, so it's absorption capacity is high enough to improve odour removal effectiveness.

2. Performance

(1) Due to immediate decomposition of odour components, deodorization properties of Odorgard^TM Process are dramatically improved, compared with the traditional scrubbing systems. No activated carbon is required.
(2) The circulating fluid's pH is 9.2 or less, the amount being lower than the conventional scrubbing systems whose pH is 10 or more. Therefore, it is possible to decrease the amount of sodium hydroxide being used in a great deal.
(3) Most odour components such as ammonia, trimethylamines and VOCs (volatile organic compounds) can be removed in the single deodorization tower.

The drawing shows a comparison of removal rates of sulphides and polysulphides between biological deodorization, traditional scrubber systems (without catalysts), and the Odorgard deodorization (with catalysts), from the nearest to the farthest.

3. Odorgard In Action

Odorgard^TM Process is effective at removing various odours from sulfides such as hydrogen sulfide, methyl sulfide and dimethyl sulfide; ammonia; amines such as trimethylamine; aldehydes; alcohols; and VOCs.
Odorgard^TM Process has been delivered in Japan and around the world to:
- Sewage works
- Rendering works
- Edible oil factories
- Animal feed factories
- Food factories
- Paint factories
- Chemical factories
- Foundries
- Leather factories
- Digestive factories
- Breweries
- Fatty acid factories
Also, a wide range of volume is available from Odorgard between 25m³/min and 2300m³/min with regard to the throughput of odour gas.

4. Others

In addition to Odorgard^TM Process, MKK also deal with Desmell-B (biological deodorization systems), Desmell-T (regenerative thermal oxidation), Desmell-A (activated carbon adsorbing), Desmell-C catalytic oxidation), and Desmell-AC (combined type of Desmell-A and C).
Further, we can retrofit Odorgard catalyst reactors to existing chemical scrubbing systems to decrease the amount of chemicals being used and to improve the deodorization efficiency.
Please contact us for more information.

Odorgard^TM is a trademark of ICI Chemicals & Polymers Limited, UK.