| Summary: | 博士 === 國立中興大學 === 環境工程學系 === 86 === The object of this study is to investigate the control
efficiency of different sorbents on the heavy metal emission
during incineration processes. The adsorption characteristics of
heavy metals at high temperatures, included the dynamic
adsorption behaviors, adsorption saturation value, and thermal
desorption efficiency, were also studied. With the results of
thermodynamic equilibrium modeling and the identification of
reaction products, the adsorption mechanisms of heavy metals on
sorbent were addressed. TThe results showed that the solid
sorbents containing silica, aluminum, or calcium could
effectively decrease the emission of heavy metal during
incineration processes. Different sorbent had respective
adsorption efficiency on different metals. On the whole silica
and limestone mixture had better adsorption efficiency on Cr and
Cu, and bauxite was the best sorbent to capture Pb and Cd. The
adsorption efficiency depends on the reaction potential of
sorbent and metals, the volatility of metals, the feed wasteFor
the sorbent of silica and limestone mixture, the major
adsorption mechanism of less volatile metals Cr and Cu is
chemical adsorption or high temperature sintering, and stable
compounds were produced. The major adsorption mechanism of high-
volatility metal Cd is physical adsorption processes, such as
heterogeneous molecular adsorption, condensation, coagulation,
and sedimentation. For medium-volatility metal Pb, the
adsorption mechanism includes chemical reaction and physical
processes. From the results
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