title: Thermal co-treatment of combustible hazardous waste and waste incineration fly ash in a rotary kiln.
abstract: 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 169kg/Mg hazardous waste for 54h and 300kg/Mg hazardous waste for 48h 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.
authors.affiliation: TU Wien, Institute for Water Quality, Resource and Waste Management, Karlsplatz 13/226, 1040 Vienna, Austria. Electronic address: florian.huber@tuwien.ac.at.
authors.forename: Florian
authors.initials: F
authors.lastname: Huber
authors.affiliation: TU Wien, Institute for Water Quality, Resource and Waste Management, Karlsplatz 13/226, 1040 Vienna, Austria; TU Wien, Institute of Chemical Engineering, Getreidemarkt 9/166, 1060 Vienna, Austria.
authors.forename: Dominik
authors.initials: D
authors.lastname: Blasenbauer
authors.affiliation: TU Wien, Institute for Water Quality, Resource and Waste Management, Karlsplatz 13/226, 1040 Vienna, Austria.
authors.forename: Ole
authors.initials: O
authors.lastname: Mallow
authors.affiliation: TU Wien, Institute for Water Quality, Resource and Waste Management, Karlsplatz 13/226, 1040 Vienna, Austria.
authors.forename: Jakob
authors.initials: J
authors.lastname: Lederer
authors.affiliation: TU Wien, Institute of Chemical Engineering, Getreidemarkt 9/166, 1060 Vienna, Austria.
authors.forename: Franz
authors.initials: F
authors.lastname: Winter
authors.affiliation: TU Wien, Institute for Water Quality, Resource and Waste Management, Karlsplatz 13/226, 1040 Vienna, Austria.
authors.forename: Johann
authors.initials: J
authors.lastname: Fellner
mesh_terms: D001317:Austria; D060729:Coal Ash; D006256:Hazardous Waste; D017745:Incineration; D019216:Metals, Heavy / Q000737:chemistry; D018505:Waste Management / Q000295:instrumentation / Q000379:methods*
chemical_list: D060729:Coal Ash; D006256:Hazardous Waste; D019216:Metals, Heavy
keywords: Fly ash; Fly ash treatment; Hazardous waste; Thermal treatment; Waste incineration