To fractionate municipal solid waste incineration bottom ash: Key for utilisation? 2015

Laura Annika Sormunen, and Riina Rantsi
Tampere University of Technology, Tampere, Finland annika.sormunen@student.tut.fi.

For the past decade, the Finnish waste sector has increasingly moved from the landfilling of municipal solid waste towards waste incineration. New challenges are faced with the growing amounts of municipal solid waste incineration bottom ash, which are mainly landfilled at the moment. Since this is not a sustainable or a profitable solution, finding different utilisation applications for the municipal solid waste incineration bottom ash is crucial. This study reports a comprehensive analysis of bottom ash properties from one waste incineration plant in Finland, which was first treated with a Dutch bottom ash recovery technique called advanced dry recovery. This novel process separates non-ferrous and ferrous metals from bottom ash, generating mineral fractions of different grain sizes (0-2 mm, 2-5 mm, 5-12 mm and 12-50 mm). The main aim of the study was to assess, whether the advanced bottom ash treatment technique, producing mineral fractions of different grain sizes and therefore properties, facilitates the utilisation of municipal solid waste incineration bottom ash in Finland. The results were encouraging; the bottom ash mineral fractions have favourable behaviour against the frost action, which is especially useful in the Finnish conditions. In addition, the leaching of most hazardous substances did not restrict the utilisation of bottom ash, especially for the larger fractions (>5 mm). Overall, this study has shown that the advanced bottom ash recovering technique can be one solution to increase the utilisation of bottom ash and furthermore decrease its landfilling in Finland.

UI MeSH Term Description Entries
D012037 Refuse Disposal The discarding or destroying of garbage, sewage, or other waste matter or its transformation into something useful or innocuous. Waste Disposal, Solid,Disposal, Refuse,Disposal, Solid Waste,Disposals, Refuse,Disposals, Solid Waste,Refuse Disposals,Solid Waste Disposal,Solid Waste Disposals,Waste Disposals, Solid
D005387 Finland A country in northern Europe, bordering the Baltic Sea, Gulf of Bothnia, and Gulf of Finland, between Sweden and Russia. The capital is Helsinki. Aland Islands,Ă…land Islands
D005591 Chemical Fractionation Separation of a mixture in successive stages, each stage removing from the mixture some proportion of one of the substances, for example by differential solubility in water-solvent mixtures. (McGraw-Hill Dictionary of Scientific and Technical Terms, 4th ed) Fractionation, Chemical,Chemical Fractionations,Fractionations, Chemical
D017745 Incineration High temperature destruction of waste by burning with subsequent reduction to ashes or conversion to an inert mass. Thermal Destruction,Destruction, Thermal,Destructions, Thermal,Incinerations,Thermal Destructions
D060729 Coal Ash Residue generated from combustion of coal or petroleum. Bottom Ash,Fly Ash,Oil Fly Ash,ROFA Pollutant,Soft Coal Fly Ash,Ash, Bottom,Ash, Coal,Ash, Fly,Ash, Oil Fly,Fly Ash, Oil,Pollutant, ROFA
D062611 Solid Waste Garbage, refuse, or sludge, or other discarded materials from a wastewater treatment plant, water supply treatment plant, and air pollution control facility that include solid, semi-solid, or contained material. It does not include materials dissolved in domestic sewage, irrigation return flows, or industrial discharges. Solid Wastes,Waste, Solid,Wastes, Solid

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