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

在本研究工作中，我们将等离子体技术应用于含卤素和重金属的难处理垃圾的处理，并研究了垃圾在等离子场中的分解行为。本研究工作取得了以下实验研究成果：1)非热等离子体分解处理卤素化合物气体时，等离子体气氛控制完全分解和抑制污染物副产物的可能性；2)高密度等离子体的特性对等离子体分离金属化合物技术的影响。在空气气氛中模拟处理的实验表明，Prese…O2的过量会导致分解速率的降低和含O原子的污染物产物的排放。证实了在加入H2的情况下，由于结合了游离的卤素原子，提高了卤素化合物气体的分解速率。为了稳定游离的卤素原子和产生酸性气体，在等离子体中直接引入了碱脱附剂。实验考察了高频炬等离子体对固体废物中有价金属化合物的分离能力。实验结果表明，等离子体密度(NP)达到2.6×1015 cm-3，激发温度为1.7 eV。在这种等离子体条件下，几种金属氧化物可以瞬间蒸发，这些化合物可以分解成原子或离子。作为下一步的实验，应该消除共存的固体物质在等离子体场中的影响，因为已经知道，由于场中杂质的存在，等离子体场的条件变得不稳定。较少

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