In all its several varieties, activated carbon has a large specific surface, and the property of absorbing the gaseous molecules of a large quantity of odorous compounds, either organic or inorganic.

The gas adsorption is carried through one or several activated carbon layers. These systems can operate with flows up to 40.000 m3/h, and one of the most common applications is H2S removal, where efficiencies up to 99.5% are reached.

They are generally used for the elimination of odour removal in confined areas (pumping stations, sludge thickeners, etc.) and small waste water treatment plants.

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