High voltage atmospheric cold plasma is a novel, non-thermal technology which has shown potential for degradation of various toxic components in wastewater. In this study, the degradation of methylene blue in aqueous solution as a model dye using a cold diffuse plasma source at atmospheric pressure has been investigated. Ambient air used as feed gas and aqueous solutions with same concentrations of the dye were treated by runaway electrons preionized diffuse discharge plasma. The removal efficiency from contaminant increased with the time of treatment increased from 5 to 20 minutes. Optical UV-IR spectroscopy was used for gathering information about the transmittance of aqueous solutions before and after treatment. The experimental results illustrated that transmittance of aqueous solution of methylene blue after 20 minutes of treatment by diffuse discharge plasma increased by ～ 30 %.
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