Chemical cleaning of gases happens in the fixed bed. It allows an optimal contact between liquid and gases circulating at counter current. Using a fixed bed is efficient for dust removal with a size up to 1 μm. Using a fixed bed is simple and profitable, allowing to have an appropriate contacts between different phases. Expected treatment is obtained by adding adapted amount of liquid.
Using a fixed bed is efficient for dust removal, gas separation or stripping and humidification/evaporation.