DEVELOPMENT OF ATMOSPHERE ENVIRONMENTAL PROTECTION TECHNOLOGY BY USING ATMOSPHERIC PRESSURE NON-THERMAL PLASMA PROCESS

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The aim of this project is the development of high pressure non-thermal plasma process to decompose gaseous environmental toxic contaminants and is scheduled for four years research. The target is establishment of non-thermal plasma process to decompose volatile organic compounds (VOCs) and realization of the diagnosis technology for the non-thermal plasma process, especially the researches concentrate to develop various optical technology, such as laser-induced fluorescence (LIF) technology for OH, O, NO, N_2*. For VOCs decomposition, 100-1,000 ppm trichloroethylene in air; is investigated as the decomposing target. To improve the decomposition energy efficiency, various kinds of catalysts are combined to the plasma process. It was f u d that the manganese-dioxide works very well to decompose the ozone which is the main byproducts for the plasma process of the air. Especially manganese-dioxide supported alumna, spheres decomposes the ozone very well and decomposes TCE very well. Only for decomposing the VOCs, specific energy density (SED) of 10 J/L can decompose TCS more than 90 %but the carbon balance to carbon oxide is very bad. It is found that SED of more than 90 J/L is required to realize the carbon balance to carbon oxide of 90 %. Two dimensional trace of the OH radical profile after the pulse discharge is recorded by using LIPF (laser-induced predissociation fluorescence) where most OH is produced in the streamer. A life time of OH is about 100 microseconds. Atomic oxygen radical is also observed by TALIF (two-photon assisted LIF) results are in good agreement with the ozone profile indicating the ozone generation by the 0 radical effect Recently, streamer motion and N2 radical is also observed by LIE Optical emission spectroscopy and Schlieren photos are also experimentally observed Still there are so many miscellaneous matters and improvement of the energy efficiency are also next good target.