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  4. Bioleaching of valuable and hazardous metals from dry discharged incineration slag. An approach for metal recycling and pollutant elimination
 
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2019
Journal Article
Titel

Bioleaching of valuable and hazardous metals from dry discharged incineration slag. An approach for metal recycling and pollutant elimination

Abstract
Recycling of process wastes will be in future an essential step to meet the demands for valuable metals of a growing market. Depending on their particle sizes incineration slags are already used to recover metals but particle size fractions below 4 mm are still difficult to recycle. Therefore, different particle size fractions (mesh size 2 and 4 mm, high energy grinded) of dry discharged slags were used for bioleaching with and without the pure cultures Acidithiobacillus ferrooxidans or Leptospirillum ferrooxidans or a mixture of Acidithiobacillus thiooxidans and Acidithiobacillus ferrooxidans in batch cultures. Regarding Al, Cr, Cu, Ni, Mn and the rare earth elements Ce, La and Er, bioleaching was significantly more successful with iron oxidizing bacteria compared to abiotic controls. Metal mobilization for Al, Cu, Mn, Cr and Er with bacteria was between 70 and 100% and for Ce, Ni and La around 50% almost after 7 days, making an industrial application for the high concentrated metals like Al and Cu feasible. In addition to the recovery of valuable metals, a reduction in cost of landfilling was identified. After treatment of the slag with the microorganisms, concentrations of harmful substances in the residues could be reduced and thus a classification in lower safety levels regarding the LAGA or EU regulations was calculated.
Author(s)
Auerbach, Romy
Fraunhofer-Einrichtung fĂ¼r Wertstoffkreisläufe und Ressourcenstrategie IWKS
Ratering, Stefan
Bokelmann, Katrin
Fraunhofer-Einrichtung fĂ¼r Wertstoffkreisläufe und Ressourcenstrategie IWKS
Gellermann, Carsten
Fraunhofer-Einrichtung fĂ¼r Wertstoffkreisläufe und Ressourcenstrategie IWKS
Brämer, Thilo
Fraunhofer-Einrichtung fĂ¼r Wertstoffkreisläufe und Ressourcenstrategie IWKS
Baumann, Renate
Schnell, Sylvia
Zeitschrift
Journal of environmental management
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DOI
10.1016/j.jenvman.2018.11.028
Language
English
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Fraunhofer-Institut fĂ¼r Silicatforschung ISC
IWKS
Tags
  • Bioleaching

  • Wertmetalle

  • Schadstoffabbau

  • Schlacke

  • recycling

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