Short-term natural weathering of MSWI bottom ash as a function of particle size

The chemical and material composition of MSWI bottom ash depends on the particle size; this suggests that the mechanisms and kinetics of natural weathering are also a function of particle size. This paper reports the effects of short-term natural weathering on the leaching of heavy metals (mainly Pb...

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Bibliographic Details
Published in:Waste management (Elmsford) 2003, Vol.23 (10), p.887-895
Main Authors: Chimenos, J.M, Fernández, A.I, Miralles, L, Segarra, M, Espiell, F
Format: Article
Language:English
Subjects:
Applied sciences
Carbon - chemistry
Coal Ash
Environmental Monitoring
Exact sciences and technology
Hydrogen-Ion Concentration
Metals, Heavy - analysis
Other industrial wastes. Sewage sludge
Particle Size
Particulate Matter
Pollution
Refuse Disposal - methods
Wastes
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Summary:The chemical and material composition of MSWI bottom ash depends on the particle size; this suggests that the mechanisms and kinetics of natural weathering are also a function of particle size. This paper reports the effects of short-term natural weathering on the leaching of heavy metals (mainly Pb, Cu and Zn) from MSWI bottom ash. Initial concentrations of heavy metals were higher for the smallest particle size fractions, but these levels fell dramatically during the first 50 days of weathering before levelling off. The main differences between size fractions were in the pH and the solubility of calcium and aluminium. For the initial stages of weathering and small size fractions, portlandite solubility seemed to control the pH. In contrast, for fractions bigger than 6 mm, the formation of ettringite was the reaction controlling the pH and the solubility of sulphates, aluminium and calcium.
ISSN:0956-053X
1879-2456
DOI:10.1016/S0956-053X(03)00074-6