| Summary: | 碩士 === 國立臺北科技大學 === 環境規劃與管理研究所 === 91 === For the restricted and overpopulated Taiwan, the way we dispose of ashes by adopting traditional method of landfill may not only result in serious waste of soil and resources, but also lead to infiltration and pollution of the nature soil and groundwater as well.
Through long and periodical sampling and analysis about twelve months the research contains the analytic characteristics of ashes composed of the elements in the municipal solid waste incinerator (including Al2O3 and CaO for general metals and Lead, Cadmium, Copper, and Chromium for heavy metals of bottom ash, fly ash, and reacted ash), variation of time, and connection of their influence factors.
According to results of the research, the paper finds that an average content of aluminum oxide in bottom ash and fly ash is about 20%, and we can try to recycle the metal by smelting. For heavy metals in the ashes, lead is primarily distributed in reacted ash (for 30~60% approximately), Cadmium in fly ash (for 30~70%) and reacted ash (for 20~60%), and Chromium mainly in fly ash(for 30~60%); comparatively, Copper has a more normal distribution. Besides, because the physical composition of plastics in the trash feeding is positively related to the quantity of lead and Cadmium in the ashes, we can substantially reduce the quantity of Pb and Cd in the ashes in the municipal solid waste incinerator and then be able to lower its TCLP leaching quantity by controlling the feeding of plastics. As to the total quantity(x) and TCLP leaching quantity(y) of lead in reacted ash and the total quantity(x) and TCLP leaching quantity(y) of Chromium in fly ash and reacted ash in incinerator discussed in this research, we can conclude in terms of the following induction functions:
y=0.073x-3.9971(R2=0.6884),
y=0.003x+1.2797(R2=0.7685),
y=0.0068x+0.6914(R2=0.6154), etc.
Hence, we can roughly evaluate TCLP leaching quantity of reacted ash and fly ash by checking total quantity of lead and Chromium in reacted ash and total quantity of Chromium in fly ash; in the meanwhile, the increase of temperature and total amount of air for combustion in the incinerator will also contribute to a more well-mixed distribution of heavy metals such as Lead, Cadmium, and Chromium in fly ash.
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