Resumen

VARELA, A. et al. Inorganic characterization of fly ash from municipal solid waste incinerator aiming their recycling. Rev. de Ciências Agrárias [online]. 2009, vol.32, n.1, pp.207-215. ISSN 0871-018X.

Fly ashes from municipal solid waste incinerators (MSWI) are considered hazardous waste. In Portugal, they are expected to increase over time which poses a growing concern about the waste management issue they represent. The use of landfills for fly ash disposal is currently the main option in many countries. Since a variety of heavy metals concentrate in fly ash, mainly deposited on the surface of particles, making them more apt to leach, the ash need to be stabilized prior to disposal, to reduce their environmental impact, which is done by the addition of cement. The electrodialytic process (ED) promisingly removes heavy metals from fly ash, enabling their further valorisation (e.g. as a soil amendment or for incorporation in construction products) and the recovery of heavy metals for further reuse. The ED uses a low-level dc current as the "cleaning agent", combining the electrokinetic movement, with the principle of electrodialysis. The Project POCTI/AGG/45073/2002, currently being carried out, aims at studying the application of the ED, in order to maximize heavy metals removal from this contaminated media. In this work the inorganic fraction of fly ash are characterized.

        · resumen en Portugués     · texto en Portugués     · Portugués ( pdf )