| Popis: |
New, much stricter European regulations, which come into operation in 1996, will require stringent treatment before storage of all ultimate industrial and household wastes, because of the presence of pollutants such as heavy and transition metals and chlorides. The main methods of stabilization of these wastes envisaged are encapsulation in cements and vitrification, the long-term stability of which have yet to be established. Irrespective of the method used, it is essential to characterize in great detail the chemistry and above all the mineralogy of the ultimate wastes to be stabilized and in particular the positions of the pollutant elements in the different phases. In this paper we deal only with the wastes obtained by treatment of the light fraction resulting from the incineration of household refuse. These are of three types obtained by two different processes which differ in the stage at which the smoke is treated with lime water: (1) fly ash (FA) obtained by simple electrof'fltration and the complementary mud cakes (MC) obtained by t'dtration after scrubbing of the smoke with lime water, and (2) the ashes (AW) obtained after direct injection of lime water into the smoke. The three types of ultimate wastes were analyzed in detail for their bulk chemistry and mineralogy. |
