Municipal solid waste incineration (MSWI) bottom ash - - PowerPoint PPT Presentation

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

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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 waste 2) Generation of energy 3) Production of combustion residues 4) Poor physical and chemical properties Building material development 1) Consumption of raw materials 2) Environmental pollution 3) Energy consumption 4) Reuse and recycling of materials

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Environment Economy

Sustainable development

• 2. Motivation

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• 3. Characterization

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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

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• 4. Treatment

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• 4. Treatment

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• 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

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• 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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Waste MSWI bottom ash fines Values Artificial 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 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

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• 5. Cold bonded pelletizing technique

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• 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!