Possible metal speciation in the fly ash produced from a fluidized bed incinerator of municipal solid waste

抄録

The primary treatment of municipal solid waste (MSW) in Japan is by using the thermal treatment that 80.3% of its MSW treated by using an incinerator in 2017. Municipal solid waste incineration (MSWI) fly ash that byproducts from the incineration process contain a high concentration of heavy metals and toxic organic compounds that can be harmful to the environment. Heavy metals are entrapped into mineral aggregate or as chlorides or sulfates condensed into fly ash particles. This study aims to estimate new possible metal speciation in the fly ash particle from the fluidized bed incinerator by using correlation analysis. Correlation analysis, is using an elemental mapping from SEM-EDX observation, can be useful for the comprehensive characterization of heavy metal speciation with other analyses such as XRD analysis. The crystalline and non-crystalline of Cr and Cu were incorporated into spinel structure in the fly ash particle. These metals also incorporated in Al/Ca/Si-based core component of fly ash particles. It suggested chromium and copper is not easily to leached out from fly ash particle because these metals entrapped into spinel structures and Al/Ca/Si-based core fly ash.