Abstract:
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Municipal Solid Waste incinerator residues produced
in two types of facilities were exhaustively characterized:
granulometry, mineralogy, chemical composition,
leaching behavior, and elemental distribution as a
function of particle size. Air Pollution Control (APC)
residues coming from a semi-dry scrubber have shown
higher solubility than fly ashes originating in an Electrostatic
Precipitator (ESP), as well as higher contents
in volatile metals (Cd, Hg). Different metal speciation
and distribution as a function of particle size have been
found in fly ashes (ESP residues) and APC residues. In
APC residues, heavy metals (with the exception of Hg)
show a parabolic distribution with maxima in the
smallest and largest particles, following the same profile
as soluble salts. Metal distribution for APC residues
exhibits that metals generally are not associated
with silicate aluminate matrix. Results show the effect
of adding lime to APC residues in metal speciation and distribution. |