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Book Chapter

Chemistry and mineralogy of municipal solid waste incinerator bottom ash

By
Urs Eggenberger
Urs Eggenberger
Institut for Geological Sciences, University of Bern, Bern, Switzerland eggenberger@geo.unibe.ch
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Kaarina Schenk
Kaarina Schenk
Swiss Agency for Environment, Forests and Landscape, Division Waste, Bern, Switzerland
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Urs Mäder
Urs Mäder
Institut for Geological Sciences, University of Bern, Bern, Switzerland eggenberger@geo.unibe.ch
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Published:
January 01, 2004

Abstract

A petrographic study was conducted on a suite of bottom ash samples from 28 municipal solid waste incinerators in Switzerland. Chemical and mineralogical analyses of bottom ash from waste combustors with comparable technology show similar major oxide composition. A significant decrease of SiO2 was observed in comparison to the chemical composition of bottom ash from 10 years ago. In contrast to major oxide contents, heavy metal concentrations vary significantly in the bottom ash samples, but without any correlation to the type of input waste or plant operating conditions. Similar types and contents of crystalline phases were observed in all samples. The content of newly formed melilite increases with decreasing bulk Si/Ca ratio, indicating that the type of Ca-Mg-Al-silicates crystallizing during incineration and cooling follow petrogenetic rules. A considerable recycling potential for ferrous and non-ferrous metals was identified in the bottom ash. Optimized mechanical metal separation technologies could reduce the waste volume, heavy metal content, H2 production, and exothermic reactions of the bottom ash in landfills and might be economically viable.

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Contents

Geological Society, London, Special Publications

Energy, Waste and the Environment: a Geochemical Perspective

R. Gieré
R. Gieré
Universität Freiburg, Germany
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P. Stille
P. Stille
ULP-École et Observatoire des Sciences de la Terre-CNRS, Strasbourg, France
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Geological Society of London
Volume
236
ISBN electronic:
9781862394841
Publication date:
January 01, 2004

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