Low-temperature formation and degradation of chlorinated benzenes, PCDD
and PCDF in dust from steel production
Öberg, T.
Science of the
Total Environment 382, 153-158 (2007).
Abstract
Dust from thermal processes may catalytically enhance the formation of
chlorinated aromatic compounds under oxygen-rich conditions. The activities of
two dust samples from electric arc furnaces and one from iron ore-based
steelmaking (oxygen converter) were investigated in a laboratory experiment. The
dust samples were heated at 300 °C for 2 h in an air atmosphere. The
concentrations of chlorinated benzenes did not change greatly upon heating,
while the concentrations of polychlorinated dibenzo-p-dioxins and
dibenzofurans decreased. The addition of copper in parallel runs resulted in a
substantial increase in the concentration of chlorinated benzenes, thus
indicating that the experimental setup was suitable for the evaluation of
low-temperature catalysis. The outcome of the experiment seems to suggest that
results cannot easily be extrapolated between different thermal and
metallurgical processes. Some measures to reduce emissions, such as inhibition
of catalytic activity and rapid cooling, could possibly be counterproductive
when applied to off-gases from the steelmaking processes investigated here.
Postprint as a PDF file
143 kb
DOI: 10.1016/j.scitotenv.2007.03.015
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