| Summary: | 碩士 === 國立成功大學 === 環境工程學系碩博士班 === 95 === A thermal desorption technoloy was choosen to treat the contaminated soil of polychlorinated dibenzo-p-dioxins/polychlorinated dibenzofurans (PCDD/Fs). The main target of this work was to investigate the effects of heating temperatures on desorption efficiency and the PCDD/F concentrations in the thermal treated soils. Results reveal that the heating temperature is a significant factor that influenced both desorption efficiency and PCDD/F concentrations in the thermal treated soils. When heating temperatures were set at 750°C and 850°C, the desorption efficiency of the total PCDD/Fs in the contaminated soil was more than 99% and the pyrolysis efficiency of total PCDD/Fs was more than 97%. In addition, the total PCDD/Fs I-TEQ concentrations in the two desorbed soils at temperatures of 750°C and 850°C were 0.892 and 1.15 ng I-TEQ/kg, respectively, both were below the soil pollution regulated standard in Taiwan (1000 ng I-TEQ/kg).
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