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Improvement of the evironmental characteristics of MSWI-bottom ash by washing, heating or carbonation in view of recycling
MSWI-bottom ash often cannot be recycled as construction material in Flanders, because leaching of Cu exceeds the limit value of 0.5 mg/kg. Leaching of other components such as Mo and Sb is critical as well, but their limit values are to date only informal. Three treatment techniques were investigated: thermal treatment, washing with solutions of organic complexants and carbonation. The first two rely on the mechanism of Cu forming highly soluble organo-complexes, the last technique decreases pH and causes metal hydroxides to react to carbonates. The thermal treatment aims at destroying the organic content, still present in the incinerator residue. Heating the bottom ash to 400 deg C decreases Cu leaching to 0.1 mg/kg. Washing was performed with six solutions, of which citric acid and ammoniumcitrate decrease Cu leaching to below the limit value. Carbonation decreased Cu leaching from 3.3 mg/kg to 1.0 mg/kg, but further improvement should be possible. Although heating and washing gave better results in the laboratory, carbonation seems to be the most promising technique, because of the lower cost when using the stack gas of an incinerator containing about 10 % CO2.
Improvement of the evironmental characteristics of MSWI-bottom ash by washing, heating or carbonation in view of recycling
MSWI-bottom ash often cannot be recycled as construction material in Flanders, because leaching of Cu exceeds the limit value of 0.5 mg/kg. Leaching of other components such as Mo and Sb is critical as well, but their limit values are to date only informal. Three treatment techniques were investigated: thermal treatment, washing with solutions of organic complexants and carbonation. The first two rely on the mechanism of Cu forming highly soluble organo-complexes, the last technique decreases pH and causes metal hydroxides to react to carbonates. The thermal treatment aims at destroying the organic content, still present in the incinerator residue. Heating the bottom ash to 400 deg C decreases Cu leaching to 0.1 mg/kg. Washing was performed with six solutions, of which citric acid and ammoniumcitrate decrease Cu leaching to below the limit value. Carbonation decreased Cu leaching from 3.3 mg/kg to 1.0 mg/kg, but further improvement should be possible. Although heating and washing gave better results in the laboratory, carbonation seems to be the most promising technique, because of the lower cost when using the stack gas of an incinerator containing about 10 % CO2.
Improvement of the evironmental characteristics of MSWI-bottom ash by washing, heating or carbonation in view of recycling
Verbesserung der Umwelteigenschaften von MSWI-Kesselaschen durch Waschen, Erwärmen oder Carbonatisieren hinsichtlich des Recyclingsprozesses
Gerven, T. Van (author) / Imbrechts, K. (author) / Keer, E. Van (author) / Vandecasteele, C. (author) / Jaspers, M. (author) / Wauters, G. (author)
2004
11 Seiten, 5 Bilder, 2 Tabellen, 13 Quellen
Conference paper
English
Baustoff , Carbonat , Erwärmung , Hausmüll , Kupfer , Laugen (Laugung) , Müllverbrennung , pH-Wert , Recycling , Umweltbelastung , Wärmebehandlung , Wäsche (Waschen)
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