the fluidizing gas along the way the discharge is substantially facilitated an injection of types of material to facilitate flow of the thick material from the centrifugal drum would include such gaseous agents as air steam hydrogen and the like this injection concept may be also utilized for the purpose of a treatment of the heavy phase material to accomplish neutralization or deodorizing and other effects this can be accomplished by injection of the appropriate gas or substances in the gas through the openings 8 and 18 this injection will cause a preadmixing within the conical portion so that the nature of the exiting heavy phase material has been modified by the injection of the control substance dependent on the nature of the material which is injected through the openings 8 and 18 the composition and viscosity of the heavy phase material can be substantially modified the fluidizing gas or other modifying agent can be injected by being blown into the heavy phase material at a pressure which preferably is in the range between 0 5 and 5 0 bar this accomplishes an adequate blending of the gas with the particles situated in the thick material the concept of the arrangement is not limited to a solid bowl worm centrifuge but can be employed utilizing specific advantages in a solid bowl centrifuge of different design further other chemical or physical reaction.