characterization, treatments, applicationuest.ntua.gr/.../presentation/...p.tangsessionvi.pdf · p....
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Municipal solid waste incineration (MSWI) bottom ash‐Characterization, treatments, application
P. TANG
M.V.A. Florea
H.J.H. Brouwers Eindhoven University of Technology
1. MSWI bottom ash Wednesday, 29 June 2016
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Waste‐to‐energy plant Waste storage before incineration
Scheme of the incineration system
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Municipal solid waste incineration
1) Reduction of solid waste2) Generation of energy3) Production of combustion residues 4) Poor physical and chemical properties
Building material development
1) Consumption of raw materials2) Environmental pollution 3) Energy consumption4) Reuse and recycling of materials
??Environment Economy
Sustainable development
2. Motivation
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(0.32) (0.9) (616) (1730)
3. Characterization Wednesday, 29 June 2016
General treatments
• Separation – clean coarse aggregate
• Fine fraction – higher amount of
contaminants
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Influence on cement hydration (binder substitute)
3. Characterization
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Influence on mortar strength (sand replacement)
3. Characterization
7 Wednesday, 29 June 20164. Treatment
8 Wednesday, 29 June 20164. Treatment
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9 4. Treatments
Washing
Remove of soluble salts (chloride, sulphate)
Thermal treatment
Reduction of heavy metals leaching (Cu, Sb, etc.)
Chemical extraction
Extraction and recycle of metals
Pelletization
Recycle and reuse of fine bottom ash to produce artificial aggregate
10 5. Cold bonded pelletizing technique
Pelletizing technique ‐ agglomerating of powdery material into a shape of pellet
Application field :
Mining ‐ iron ore
Agriculture ‐ Fertilizer
Biomedical field ‐medicine production
Recycling powder wastes to produce lightweight
aggregate – sludge and dust, coal/MSWI fly ash, GGBS, etc.
MSWI bottom ash fines (new)
Disc/pan pelletizer
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MSWI bottom ash fines properties ‐ negative
Highly porous material
Containing contaminants (heavy metals and salts)
Metallic aluminum (expansion risk)
High costs for general treatment
Cold bonded pelletization with binders ‐ positive
Controlling size for application in concrete
Density control
Pellet strength
Spherical particle size for better flowability
Immobilization by binders (S/S)
Pre‐reaction of metallic aluminum
Low cost
5. Cold bonded pelletizing technique
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WasteMSWI bottom ash fines
ValuesArtificial aggregates
Application in concrete
Cold bond technique
Stage 1
Characterization
Stage 2
Technique study
Recipe design
Stage 3
Properties of pellet
Optimization of recipe according to
requirement
Stage 4
Properties of concrete
Environmental impact of artificial
aggregate application
Recycling
5. Cold bonded pelletizing technique
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1 2 3
5. Cold bonded pelletizing technique
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Properties of the artificial aggregates
Specific density 2.5 g/cm3
Loos bulk density 980 kg/m3
belong to lightweight aggregate according to EN standards
Crushing resistance 7.5 N/mm2
higher than other artificial aggregate in literature
The leaching of the sulphate, copper and antimony is well under limit value.
5. Cold bonded pelletizing technique
15 5. Cold bonded pelletizing technique Wednesday, 29 June 2016
16 5. Cold bonded pelletizing technique
• Bulk density‐decreased by 10%
• Crushing resistance‐increased by 12‐22%
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Thank you for your attention!