Process for the substantial reductio of bacterial count in sewage waste and assembly for treating same. The assembly comprises means for conveying sewage waste material to a treatment zone, means for retaining the waste material therein, temperature control means to insure that the contents retained in the treatment zone attain a temperatures at least that of boiling water and means for passing the treated sewage wastes from the treatment zone so that upon discharge of the treated waste material, substantially all of the bacteria have been destroyed.