Basic Study on Treatment of Pollutant Hard-Treated Wastes by non-thermal plasma

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In this research work, we applied the plasma technology for treatment of hard-treated wastes, which contain halogens and heavy metals, and investigate the decomposition behavior of wastes in plasma field was investigated. This research work reported the results obtained from the following experimental investigation, i) investigation of the possibility of plasma atmosphere controlling for completely decomposition and depression of pollutant by-product in the case of decomposition treatment of halogen compound gases by non-thermalplasma ii) investigation of the characteristics of high density plasma on the plasma technology for separating the involved metal compounds from wastesIn this research work about the technology for decomposition of halogen compound gases by non-thermal plasma, the influence of coexisting gas in plasma field on the decomposition of halogen compound gases like halon and freon. The experiments, simulated the treatment in the air atmosphere, indicated that the prese … More nce of O2 cause the decrease of decomposition rate and the emission of pollutant products, which contained O atom. It was confirmed the increase of decomposition rate of halogen compound gases in the case of addition of H2 for combining the free halogen atom. In order to stabilize the free halogen atom and produced acid gases, alkali sorbent was introduced in the plasma field directly. The sorbent settled in the reactor has the effect not only of the increase of decomposition rate but also depression of halogen by-products.The experiments were carried out to evaluate the ability of high frequency torch plasma in the system for the separating valuable metal compounds from solid wastes. The experimental results demonstrated that the plasma density (np) reached 2.6x1015cm-3, and the excitation temperature became 1.7eV. In this obtained plasma condition, severalmetaloxides can evaporate instantly and these compounds can be decomposed to atom or ion. As a next experimental step, it should be cleared the effect of coexisting solid material in the plasma field, because it has been known that the condition of plasma field become unstable owing to the presence of impurities in the field. Less