Caractérisation et traitement des résidus de contrôle de la pollution de l'air (RCPA) d'incinérateurs de déchets municipaux par un procédé de lixiviation en milieu basique

• Published in: Journal of environmental engineering and science Vol. 4; no. 4; pp. 287 - 298
• Main Authors: Hammy, Fatima, Mercier, Guy, Blais, Jean-François
• Format: Journal Article
• Language: English
• Published: 01.07.2005
• ISSN: 1496-2551; 1496-256X
• DOI: 10.1139/s05-010

A detailed characterization of the different types of air pollution control residues (APCR) produced in municipal waste incinerators has been performed. The analysis of the Pb distribution in boiler and electrofilter ashes has shown that the separation of these ashes in two fractions (<125 µm and >125 µm) allows to get a coarse fraction slightly contaminated and a finer fraction more heavily contaminated, which can be treated by chemical means. Scanning electron microscope – energy-dispersive spectrometry (SEM-EDS) techniques have been used to identify the most dominant forms of the lead particles. Lead present in used lime is principally associated with oxides in a carrying phase of calcium chloride or phosphate. Lead present in boiler and electrofilter ashes is principally associated with silicates and phosphates. Finally, only one leaching step in alkaline aqueous solution is required to remove a large proportion of the leachable lead in APCR and to reach the allowed level by the toxicity characteristic leaching procedure test (TCLP) and neutral water test. Key words: lead, leaching, incinerator, air pollution control residues (APCR), ash, removal, heavy metal, toxicity characteristic leaching procedure test (TCLP).