Mineralogy and pore water chemistry of a boiler ash from a MSW fluidized-bed incinerator

This paper presents an investigation of the mineralogy and pore water chemistry of a boiler ash sampled from a municipal solid waste fluidized-bed incinerator, subject to 18 months of dynamic leaching in a large percolation column experiment. A particular focus is on the redox behaviour of Cr(VI) in...

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Bibliographic Details
Published in:Waste management (Elmsford) 2010-07, Vol.30 (7), p.1280-1289
Main Authors: Bodénan, F., Guyonnet, D., Piantone, P., Blanc, P.
Format: Article
Language:English
Subjects:
ALUMINIUM
ALUMINIUM COMPOUNDS
ALUMINIUM HYDROXIDES
Aluminum
ASHES
BOILERS
CHEMISTRY
CHROMIUM
Cities
COMBUSTION PRODUCTS
DISSOLUTION
ELEMENTS
Environmental Engineering
ENVIRONMENTAL SCIENCES
Fluid dynamics
FLUIDIZED BEDS
FLUIDS
GEOCHEMISTRY
HAZARDS
HEALTH HAZARDS
HYDROGEN COMPOUNDS
HYDROXIDES
Incineration
INCINERATORS
LEACHING
METALS
MINERALOGY
MINERALS
Minerals - analysis
Minerals - chemistry
OXIDE MINERALS
OXYGEN COMPOUNDS
Porosity
QUARTZ
RESIDUES
SEPARATION PROCESSES
SOLID WASTES
TRANSITION ELEMENTS
Waste Products - analysis
WASTES
WATER CHEMISTRY
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Summary:This paper presents an investigation of the mineralogy and pore water chemistry of a boiler ash sampled from a municipal solid waste fluidized-bed incinerator, subject to 18 months of dynamic leaching in a large percolation column experiment. A particular focus is on the redox behaviour of Cr(VI) in relation to metal aluminium Al 0, as chromium may represent an environmental or health hazard. The leaching behaviour and interaction between Cr(VI) and Al 0 are interpreted on the basis of mineralogical evolutions observed over the 18-month period and of saturation indices calculated with the geochemical code PhreeqC and reviewed thermodynamic data. Results of mineralogical analyses show in particular the alteration of mineral phases during leaching (e.g. quartz and metal aluminium grains), while geochemical calculations suggest equilibria of percolating fluids with respect to specific mineral phases (e.g. monohydrocalcite and aluminium hydroxide). The combination of leaching data on a large scale and mineralogical analyses document the coupled leaching behaviour of aluminium and chromium, with chromium appearing in the pore fluids in its hexavalent and mobile state once metal aluminium is no longer available for chromium reduction.
ISSN:0956-053X
1879-2456
DOI:10.1016/j.wasman.2010.01.020