Recycling Incineration Wastes for Producing Synthetic Aggregates

Title: Recycling Incineration Wastes for Producing Synthetic Aggregates
Author(s): Quina
Paper category : conference
Book title: International RILEM Conference on the Use of Recycled Materials in Building and Structures
Editor(s): E. Vázquez, Ch. F. Hendriks and G.M.T. Janssen
Print-ISBN: 2-912143-52-7
e-ISBN: 2912143756
Publisher: RILEM Publications SARL
Publication year: 2004
Pages: 439 - 445
Total Pages: 7
Nb references: 10
Language: English

Abstract: This work involves the utilisation of a by-product from municipal solid waste
incineration (MSWI) for producing lightweight aggregates to be further used in building
construction. This residue that comprehends fly ashes from the heat recovery devices as well
as the residues produced in the scrubber and bag filters, is referred as Air Pollution Control
(APC) residues. At present this waste has limited applications, and is usually landfilled after
stabilization/solidification with hydraulic binders. The residue is considered as hazardous
mainly due to its high content of soluble salts and heavy metals. The industrial process of
lightweight aggregates could be used to recycle the waste, which would replace a small
percentage of the main raw material (expanded clay). The main goal of the present study is to
measure the effect of the waste in the technological properties of the aggregates, mainly in
what concerns the density. Other properties such as the compressive strength, water
adsorption and bloating index were also determined. On the other hand, the assessment of the
environmental impact is an important aspect to be considered, and thus the gaseous emissions
during the firing process were also quantified. In fact, acid gases such as HCl may be
produced due to the high chloride content present on the waste. The acid neutralization
capacity (ANC) was also determined, in order to evaluate how sensitive the material is to the
external pH variations.
The results obtained show that synthetic lightweight aggregates may be considered as
a valuable way for recycling these residues produced all over Europe and other developed
countries.

Online publication: 2004-09-29
Publication type : full_text
Public price (Euros): 0.00
doi: 10.1617/2912143756.049