In this paper,an experimental study on SO_2 removal by nanosecond rising edgepulse dielectric barrier discharge (DBD) plasma,generated by multi-needle-to-plane electrodes,iscarried out.The mechanism of the effect of various factors,such as gap size between dielectricbarrier and discharge needles,environmental humidity,and inlet speed of gas flow upon the removalefficiency of air purification is analyzed.The studies show that SO_2 removal efficiency improveswith the increase in the gap size between dielectric barrier and discharge needles in the case ofa fixed space between two electrodes,and also improves with the increase in the environmentalhumidity.For a mixed gas with a fixed concentration,there is an optimal inlet speed of gas flow,which leads to the best removal efficiency.
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