Abstract: A sedimentation tank having a central feedwell comprising upper and lower cylindrical channels or raceways for receiving the influent feed in split counter rotative streams wherein an intermediate raceway is provided between the upper and lower channels for receiving a flocculant for mixing with the influent feed in the shear zone where the split streams remerge.

Abstract: Moist combustible matter is burned in a combustion zone following a drying treatment in which the combustible matter is brought into contact with hot, inert particulates circulated from the combustion zone. The water in the combustible matter is evaporated at a relatively low temperature in the drying zone, thereby conserving heat in the system. The exhaust gas stream from the drying zone is handled separately from the reactor exhaust gases to condense the water vapor therein, the water is removed from the process and the remaining gas is subjected to odor-destroying high temperature.

Abstract: Moist combustible matter is burned in a fluid bed reactor following a drying treatment in which the combustible matter is brought into contact with hot sand circulated from the fluid bed reactor. The water in the combustible matter is evaporated at a relatively low temperature in the drying treatment, thereby conserving heat in the system. The exhaust vapor from the drying treatment is handled separately from the reactor exhaust gases to condense the vapor therein before subjecting the remaining gas to odor-destroying high temperature.