Investigation Of Washing, Heating And
Carbonation As Treatment Techniques
For The Improvement Of Environmental
Characteristics Of MSWI-bottom Ash,
In View Of Recycling
Author(s)
T. Van Gerven, K. Imbrechts, E. Van Keer, M. Jaspers,
G. Wauters & C. Vandecasteele
Abstract
MSWI-bottom ash often may not 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 limit values for
these elements are to date only informal.
Three treatment techniques were investigated to lower Cu leaching: thermal
treatment destroying organic matter still present in the incinerator residue and
ligands that may form complexes with Cu and enhance leaching, washing with
solutions of organic complexants to extract Cu and accelerated carbonation.
Carbonation decreases pH and causes metal hydroxides to react to carbonates.
Heating the bottom ash to 400°C decreases Cu leaching to 0.1 mg/kg.
Washing was performed with six solutions, of which washing with citric acid
and ammoniumcitrate decreases 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, accelerated carbonation seems to be the most promising
technique.
Keywords: MSWI-bottom ash, leaching, heavy metals, recycling, carbonation,
washing, heating.
Keywords
MSWI-bottom ash, leaching, heavy metals, recycling, carbonation,
washing, heating.
Related Book
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