1. Apparatus for treating material comprising excreta for providing a dried granular or powder end product, said apparatus comprising: means for conducting said material in a slurry form, first screening means connected to said conducting means to receive slurry therefrom and separate foreign matter from the same, second screening means for screening said slurry to remove moistening liquid and thereby produce a sludge, compacting means connected to the second screening means to receive the sludge and compact the same to express moistening liquid therefrom, a treatment zone, a microwave generator having wave guide terminals located in said zone, and a conveyor comprising a plastics tube and a screw conveyor therein, for conveying compacted material from the compacting means to and through said treatment zone.

3. A method of treating material comprising poultry excreta for providing a dried granular or powder end product, said method comprising: mixing the material with water to produce a slurry, passing the slurry through first screening means to separate foreign matter therefrom, removing liquid from the slurry in a second screening means to produce a sludge, compacting the sludge to extract liquid therefrom, continuously conveying the compacted material through a treatment zone and subjecting the same to microwave radiation during passage through said zone.