Abstract: In a deodorizing apparatus, at least the lower part of a column is surrounded at least partly by compartments which are not connected together, each compartment having means for supplying treatment fluid and means for discharging the treated material with separate control but opening into a common duct. The duct for discharging the treated material from the central column is divided into separate ducts the outlets of which open into the compartments and which are provided with separately-controlled means for carrying the material to the respective compartments.