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Progress in Plasma Processing of Materials, 1999

ISBN:
1-56700-126-2 (Print)

TREATMENT OF MSW FLY ASHES IN PLASMA REACTOR: MONITORING OF CHLORINATED COMPOUNDS DESORPTION BY MASS SPECTROMETRY

F. Genet
Laboratoire de Genie des Procedes Plasmas et Traitement de Surfaces Universite Pierre et Marie Curie - ENSCP 11 rue Pierre et Marie Curie, 75231 Paris Cedex 05 - France

K. Coulibaly
Laboratoire de Genie des Procedes Plasmas et Traitement de Surfaces Universite Pierre et Marie Curie - ENSCP 11 rue Pierre et Marie Curie, 75231 Paris Cedex 05 - France

S. Cavadias
Laboratoire Genie Precedes Plasmas - ENSCP 11, rue Pierre et Marie Curie - 75005 Paris- France

Jacques Amouroux
Laboratoire de Genie des Precedes Plasmas Universite P. et M. Curie, ENSCP 11 rue P. et M. Curie 75005 Paris France

Abstract

In the present work, an RF low-pressure plasma reactor has been developed in order to study the desorption of chlorinated compounds from MSW fly ashes. Due to chemical complexity of a real MSW fly ashes, we have developed a model of fly ashes using a matrix of alumina, calcium oxide, silica and zeolites spiked with halogens and metals. Plasma/simulated fly ash interaction has been studied by on-line mass spectrometry.
Experiments have been performed with and without discharge, in order to point out the plasma chemical reactivity on chlorine desorption. Under plasma conditions, the main chlorinated compounds formed are Cl2, HC1 and COCl2. The composition of the chlorinated effluents depends on the nature of the plasma. The main results are the trapping of chlorine when hydrogen is added and the formation of phosgene when carbon and oxygen are added. The use of a fluidized bed of calcium oxide particles can reduce strongly toxic effluent emissions.