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      저자 : ( Astryd Yiandila Dahlan Hiroki Kitamura ) (검색결과 1 건)
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      • Interparticle elemental heterogeneity of surface and insoluble inner matrices of municipal solid waste incineration fly ash particles: A comparison between stoker incinerator and fluidized bed incinerator

        ( Astryd Yiandila Dahlan Hiroki Kitamura ),( Yu Tian ),( Hirofumi Sakanakura ),( Takashi Yamamoto ),( Fumitake Takahashi ) 한국폐기물자원순환학회(구 한국폐기물학회) 2018 한국폐기물자원순환학회 심포지움 Vol.2018 No.1

        Incineration is major treatment method of municipal solid waste (MSW) in Japan to reduce volume and weight of the waste. In 2016, total MSW generation in Japan was about 43.17 million tons and around 80 % of MSW were combusted by incinerators. Bottom ash and fly ash are the main products from MSW incinerators. MSW incineration fly ash is categorized as hazardous waste due to high concentration of leachable toxic heavy metals and the presence of toxic organic compounds like dioxins. Although MSWI fly ash is fine particles and has been regarded as homogeneous in numerous previous researches, it has not been proved based on sufficient analysis in the micro-scale. Therefore, the objective of the study is to investigate particle-scale heterogeneity of fly ash, in particular heterogeneity among fly ash particles (interparticle heterogeneity). In this study, fly ash generated from a fluidized bed and stoker combustor were analyzed and compared. Surface elemental concentrations of each fly ash particles, measured by SEM-EDS, were used to analyze elemental heterogeneity among fly ash particles. In order to measure interparticle heterogeneity of inner matrices of fly ash particles, Japan leaching test 19th (JLT 19), which used hydrochloric acid as leaching medium with liquid-to-solid ratio of 33.3, were conducted to remove semi-soluble and soluble components of fly ash particles. For each sample of stoker incinerator fly ash, fluidized bed incinerator fly ash, and their insoluble residues of JLT 19, 100 particles were measured. Elemental binary molar ratio among Ca, Si and A1 were plotted in ternary diagrams to visualize interparticle heterogeneity. Major elements in fly ash particles generated from both incinerators have large distributions of elemental concentrations. On the other hand, there are not significant differences of elemental concentration distribution between both incinerator fly ash excluding calcium (Ca). Ca concentration in fluidized bed combustor is relatively higher than stoker combustor. Ca concentration distribution of fluidized bed incinerator fly ash is wider than that of stoker combustor fly ash. Elemental ratios among Ca, Si and Al, plotted in triangular graphs, clearly shows that fly ash particles produced from stoker combustor concentrated in Ca area. On the other hand, fly ash of fluidized bed incinerator are dispersed more to Ca and Si sides as shown in Figure 1. This means that fly ash of fluidized bed incinerator has larger interparticle elemental heterogeneity compared to stoker combustor fly ash although different waste streams might have caused this difference to some extent. Fly ash residues of JLT 19 are relatively concentrated in Si area compared to fly ash particle surfaces. The authors expected that most of residue samples would be plotted near Si area. However, some particles spread to Ca and A1 areas. Moreover, fly ash of stoker incinerator has more scattered plots than fluidized bed incinerator fly ash. In contrast to interparticle elemental heterogeneity on fly ash surfaces, insoluble inner matrices of stoker incinerator fly ash have larger interparticle heterogeneity than fluidized bed incinerator fly ash. These analysis results would be useful for not only evaluation of fly ash heterogeneity but also considerations of fly ash formation mechanisms.

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