Bottom Ash
The non-airborne combustion residue from burning pulverized coal in a boiler; the material which falls to the bottom of the boiler and is removed mechanically; a concentration of non-combustible materials, which may include toxics.
B bottom ash
Definition (english only)
Relatively coarse, non-combustible, generally toxic residue of incineration that accumulates on the grate of a furnace.
During combustion bottom ash is the ash that is left behind in, or under the grate or combustion region, or at the bottom of a gasifier. Fly ash consists of very small particles of ash that are carried out of the system along with the flue gases.
 See also: Reduction, Toxic, Air, Water, Ash
  
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