Abstract: Apparatus for intermingling dust-carrying gas and bulk goods for treating either one, e.g. drying the bulk goods or scrubbing the gas, in a bed of the bulk goods aerated by the gas. The apparatus comprises a grating with through-flow openings for a first partial stream of the gas which are so directed that this first partial stream flows substantially horizontally from the outside and inwardly towards the middle of the bed and another gas inlet in the middle of the grating for introducing a second partial stream of the gas from below and upwardly in the bed. A dust separator is arranged for scrubbing the first partial stream before it is supplied to the through-flow openings of the grating. The other gas inlet is connected so that the second partial stream is supplied to the grating more rich in dust than the first partial stream.