Thermal treatment of hazardous waste for heavy metal recovery

In this study, a new method for recovering heavy metals from hazardous waste is introduced. The process is characterized by a separation of heavy metals and residues during the thermal treatment under a sub-stoichiometric atmosphere in a rotary kiln. After leaving the rotary kiln the separated heavy...

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Veröffentlicht in:Journal of hazardous materials 2007-07, Vol.145 (3), p.351-357
Hauptverfasser: Hoffmann, Gaston, Schirmer, Matthias, Bilitewski, Bernd, Kaszas-Savos, Melania
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container_end_page 357
container_issue 3
container_start_page 351
container_title Journal of hazardous materials
container_volume 145
creator Hoffmann, Gaston
Schirmer, Matthias
Bilitewski, Bernd
Kaszas-Savos, Melania
description In this study, a new method for recovering heavy metals from hazardous waste is introduced. The process is characterized by a separation of heavy metals and residues during the thermal treatment under a sub-stoichiometric atmosphere in a rotary kiln. After leaving the rotary kiln the separated heavy metals are precipitated in a hot gas ceramic filter. Using this technology, hazardous materials, both liquids and pasty hazardous waste containing heavy metals, can be treated and a product with a quasi-raw material condition can be formed. In contrast to current methods, the harmful substances should not be immobilized and disposed. In fact, a saleable product highly concentrated with heavy metals should be formed. During preliminary investigations with a solution containing sodium chromate tetrahydrate, the process was tested in a pilot plant. Here, the separation of chromium could be demonstrated with leaching tests and characterization of the filter dust. Analysis concerning the disposability of the residues had not been carried out because only the process and the characteristic of the filter dust were in the centre of attention.
doi_str_mv 10.1016/j.jhazmat.2007.03.080
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title Thermal treatment of hazardous waste for heavy metal recovery
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