Removal of NO Molecules by a Novel Atmospheric Pressure Plasma Apparatus

A novel atmospheric pressure plasma apparatus （APPA） is designed with a liquid electrode, and its discharging characteristics are studied. Relatively uniform and intense discharge can be realized in the APPA system. An experimental study on removal of NO molecules is carried out by using the APPA, and more than 95.5% of NO is decomposed when the NO initial concentration is lower than 400ppm. Removal of NO efficiency increases rapidly with the increasing discharge power. Compared with the absence of O2, more NO2 is generated with the increase of O2 concentration. However, most of the NO molecules are decomposed to N2 and O2 directly, when O2 concentration changes from 0 to 1.1 vol%.     

A cold plasma plume with a highly conductive liquid electrode

A cold dielectric barrier discharge （DBD） plasma plume with one highly conductive liquid electrode has been developed to treat thermally sensitive materials, and its preliminary discharging characteristics have been studied. The averaged electron temperature and density is estimated to be 0.6eV and 1011/cm3, respectively. The length of plasma plume can reach 5cm with helium gas （He）, and the conductivity of the outer electrode affects the plume length obviously. This plasma plume could be touched by bare hand without causing any burning or painful sensation, which may provide potential application for safe aseptic skin care. Moreover, the oxidative particles （e.g., OH, O＊, 03） in the downstream oxygen （02） gas of the plume have been applied to treat the landfill leachate. The results show that the activated 02 gas can degrade the landfill leachate effectively, and the chemical oxygen demand （COD）, conductivity, biochemical oxygen demand （BOD）, and suspended solid （SS） can be decreased by 52%, 57%, 76% and 92%, respectively.