Treatment Of Solid Waste Polluted
By Polychlorinated Contaminants
(pilot-scale Demonstration)
Author(s)
M. Kubal, J. Fairweather, P. Crain& M. Kuraš
Abstract
This work describes a pilot-scale demonstration of thermal desorption treatment
and base catalyzed decomposition of solid waste containing polychlorinated
contaminants (e.g. dioxins). The two technological processes were chosen to
treat the solid waste from a heavily polluted site in the Spolana Neratovice
(Czech Republic) chemical plant. Contaminated waste, such as soil, building
waste and steel parts, was first processed by thermal desorption, where the
polychlorinated pollutants were desorbed from the solid matrix in the electrically
heated chamber purged with nitrogen and accumulated at the outlet from the
desorption unit in the form of a condensate. The condensate thus formed was
transferred to the BCD reactor, where it was mixed with mineral oil, sodium
hydroxide and a catalyst and processed at a temperature of about 350 o C. The
chlorinated chemicals found at the site in their original containers and bags were
processed directly in the BCD reactor. Approximately 1 m 3 of polluted building
waste, soil, chemicals and steel parts were treated during the pilot-scale
demonstration. Both the thermal desorption process and the BCD reactor showed
very high efficiencies in removing and dechlorination of contaminating
compounds even in the case of extremely high concentrations. In most cases the
concentration of dioxins in decontaminated materials was lower than 200 ng/kg
(TEQ less than 100 ng/kg).
Keywords: solid waste, polychlorinated contaminants, dioxins, thermal
desorption, base catalyzed decomposition, BCD.
Keywords
solid waste, polychlorinated contaminants, dioxins, thermal
desorption, base catalyzed decomposition, BCD.
Related Book
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