Thermal co-treatment of combustible hazardous waste and waste incineration fly ash in a rotary kiln
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Florian Huber [1] ; Dominik Blasenbauer [1] ; Ole Mallow [1] ; Jakob Lederer [1] ; Franz Winter [1] ; Johann Fellner [1]
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[1] Vienna University of Technology
Vienna University of Technology
Innere Stadt, Austria
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- Localización: Waste management, ISSN-e 0956-053X, Vol. 58, 2016, págs. 181-190
- Idioma: inglés
- Texto completo no disponible (Saber más ...)
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Resumen
As current disposal practices for municipal solid waste incineration (MSWI) fly ash are either associated with significant costs or negative environmental impacts, an alternative treatment was investigated in a field scale experiment. Thereto, two rotary kilns were fed with hazardous waste, and moistened MSWI fly ash (water content of 23%) was added to the fuel of one kiln with a ratio of 169 kg/Mg hazardous waste for 54 h and 300 kg/Mg hazardous waste for 48 h while the other kiln was used as a reference. It was shown that the vast majority (>90%) of the inserted MSWI fly ash was transferred to the bottom ash of the rotary kiln. This bottom ash complied with the legal limits for non-hazardous waste landfills, thereby demonstrating the potential of the investigated method to transfer hazardous waste (MSWI fly ash) into non-hazardous waste (bottom ash). The results of a simple mixing test (MSWI fly ash and rotary kiln bottom ash have been mixed accordingly without thermal treatment) revealed that the observed transformation of hazardous MSWI fly ash into non-hazardous bottom ash during thermal co-treatment cannot be referred to dilution, as the mixture did not comply with legal limits for non-hazardous waste landfills. For the newly generated fly ash of the kiln, an increase in the concentration of Cd, K and Pb by 54%, 57% and 22%, respectively, was observed. In general, the operation of the rotary kiln was not impaired by the MSWI fly ash addition.
