Production Of Lightweight Aggregate From
Incinerator Bottom Ash And Pulverised
Fuel Ash
Author(s)
S. Bethanis & C. R. Cheeseman
Abstract
Waste incineration is increasingly considered a leading alternative to landfill in
many countries due to limited availability of landfill sites and potential adverse
environmental effects associated with waste disposal. Incinerator bottom ash
(IBA) residues are generated at a rate of approximately 800 kilotonnes per year
in the UK and the majority is currently landfilled. The production of lightweight
aggregate by sintering mixes of municipal solid waste IBA and pulverised fuel
ash (PFA) represents a potentially attractive reuse application for these high-volume
waste materials. PFA has been added to IBA to control the sintering
behaviour. The effect of adding a carbonaceous material that decomposes during
firing to produce controlled levels of porosity has been investigated. Waste
activated carbon has been used as a pore former in pellets containing significant
quantities of IBA. Two lightweight aggregates were manufactured, a carbon-free
and a carbon-containing aggregate, and were characterised in terms of physical,
mechanical, mineralogical and microstructural properties. The IBA-derived
aggregate performance was assessed in comparison with commercial synthetic
aggregate (Lytag) and the results confirmed the feasibility of the production of
lightweight aggregate using significant concentrations of the high-volume
combustion bottom ashes.
Keywords: waste reuse, incinerator bottom ash, pulverised fuel ash, resource
conservation, aggregate.
Keywords
waste reuse, incinerator bottom ash, pulverised fuel ash, resource
conservation, aggregate.
Related Book
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