New efficient depollution techniques for water decontamination, purification and disinfection are being sought to replace those classic methods (chemical, filtration, ozonisation, photochemical reactions) that have deficiency for some substances. The use of plasma technologies, discharges in, or in contact with, wastewater are promising approaches for the decomposition of pollutants by highly oxidative radicals, charged particles, UV radiation, etc. produced by plasma. In the present study we report on the potential of radiofrequency single and multiple filamentary Dielectric Barrier Discharge (DBD) jets for the decolorization of methylene blue (MB) dye in water solutions. Optical emission spectroscopy (OES) investigations were performed for the characterization of plasma evolving in air, and in liquid. The decolorization process was monitored by absorption spectroscopy. We determined the decolorization time, according to a variety of external parameters. The key parameters for obtaining the maximum decolorization rate were identified as being the discharge tube diameter, tube nature (glass/ceramic), the injected power in the discharge, the type of reactive gas and the number of filamentary plasma jets.

中文翻译：

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用于污水净化的单丝等离子射流的开发与优化

正在寻求用于水净化、净化和消毒的新的高效去污染技术来取代那些对某些物质有缺陷的经典方法（化学、过滤、臭氧化、光化学反应）。使用等离子体技术，排放到废水中或与废水接触，是通过等离子体产生的高氧化自由基、带电粒子、紫外线辐射等分解污染物的有前途的方法。在本研究中，我们报告了射频单丝和多丝介质阻挡放电 (DBD) 射流在水溶液中亚甲蓝 (MB) 染料脱色的潜力。进行了光学发射光谱 (OES) 研究以表征在空气和液体中演化的等离子体。通过吸收光谱监测脱色过程。我们根据各种外部参数确定脱色时间。获得最大脱色率的关键参数被确定为放电管直径、管性质（玻璃/陶瓷）、放电中的注入功率、反应气体的类型和丝状等离子体射流的数量。