| Summary: | 碩士 === 國立屏東科技大學 === 環境工程與科學系 === 91 === The purpose of this research are to develop an economical, simple, and clean technology, which can attain high destruction and removal efficiency of gaseous halogenated organic pollutants and recover some resources. In this research, a variety of volatile halogenated organic compounds will be used as study materials, especially, CFC-12(dichlorodifluromethane) because of its superior chemical stability and low decomposition rate by other thermal treatment methods. Several salts will be used as the treatment medium. Experiments will be conducted with varied operating parameters, such as concentration, temperatures, kinds of molten salt, flow rate, residence time, bubble size, and etc.
Results showed DRE could be up to 39.2％(magnesium nitrate)、42.9％(copper nitrate)、32.4％(aluminum nitrate)、29.7(ferric nitrate)及74.8％(zinc nitrate)when 0.15LPM of gaseous flow capacity and 90﹪of CFC-12 was fed at high temperature. The reacted gaseous products were mainly carbon dioxide and water and the organic and inorganic acid gases were not observed. The elements of chlorine, fluorine, and organic compounds were captured by the molten salt and combined with chlorine to magnesium chloride, copper chloride, aluminum chloride, ferric chloride, and zinc chloride. They were also combined with fluorine to magnesium fluoride, copper fluoride, aluminum fluoride, ferric fluoride, and zinc fluoride. In this system we also find that calcium nitrate and paraffin wax have no destruction removal efficiency. Anyway it can offer some references to scholars. Processes of pyrolysis, oxidation, char removal and recycle molten salts were all complete in molten reactor, there, the method of molten salt is potential treatment for gaseous organics.
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