Host: Japan Society of Material Cycles and Waste Management
It is necessary to control the leaching of toxic metals in municipal solid waste incineration (MSWI) fly ash before landfill disposal because MSWI fly ash contains higher concentration of some toxic metals. However, the impact of morphological surface conversions by chelating treatment of MSWI fly ash on the immobility of metal is still uncertain. Therefore, this study investigated morphological surface characteristics and their conversions of MSWI fly ash. SEM observation showed that MSWI fly ash was mineralogically active. Although the incorporation of metal into needle-like crystals was observed, its contribution to metal immobilization is likely limited. After fly ash particles were grouped according to their morphological characteristics, their surface elemental compositions were analyzed. The results showed large heterogeneity and μm-level site dependency even in the same group samples.
