Bj. Stuart et Ds. Kosson, CHARACTERIZATION OF MUNICIPAL WASTE COMBUSTION AIR-POLLUTION CONTROL RESIDUES AS A FUNCTION OF PARTICLE-SIZE, Combustion science and technology, 101(1-6), 1994, pp. 527-548
Air Pollution Control (APC) residues from Municipal Waste Combustion (
MWC) typically contain high concentrations of potentially toxic metals
. APC residues, consisting of fly ash and lime spray drier scrubber re
sidue, were sieve separated into six size fractions. Residue character
ization included physical and morphological classification and chemica
l speciation. Elemental distributions as a function of particle size i
ndicated parabolic distributions for matrix species and sigmoidal dist
ributions for volatile species. Unreacted lime in the scrubber residue
preferentially was present in the smallest fractions which greatly al
tered the elemental distribution profiles. Mathematical correction for
this highly water soluble portion of the residue normalized the data
which showed extreme similarity between facilities. Parabolic profiles
became nearly linear with negative slopes and sigmoidal trends were t
ransformed into exponential curves. This included adjusted lead concen
trations approaching 2 wt% and zinc concentrations up to 8 wt% in the
smallest fractions.