Special type of plasma dielectric barrier discharge reactor for direct ozonization of water and degradation of organic pollution
Special type of plasma dielectric barrier discharge reactor for direct ozonization of water and degradation of organic pollution
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DOI：
10.1088/0022-3727/41/8/085207
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发表时间：
2008-04-21
影响因子：
3.4
通讯作者：
Takai, O.
中科院分区：
文献类型：
--
作者：
Baroch, P.;Saito, N.;Takai, O.
介绍了一种基于介质阻挡放电(DBD)的直接臭氧氧化净水系统。大气DBD系统的一种特殊设计的特点是在电极之间的区域加入了一个多孔陶瓷段。该多孔段被放置在金属电极上，作为流动水的导向器。由于亲水的力量，它允许水保持不受放电的干扰。这一特征使得能够减小放电间隙，并随后增加放电的强度、稳定性和均匀性。观察到，在这样的结构下，可以实现等离子体放电从丝状模式到半均匀模式的转变。用光学发射光谱方法研究了其放电特性，结果表明，氮线在UV-A区占主导地位。此外，还观察到，该系统可以在很宽的液体导电率范围内运行，并且可以忽略对液体溶液的热沉积。最后，测定了去离子水中溶解的臭氧和过氧化氢的生成，并进行了有机染料的分解试验。
A system based on the dielectric barrier discharge (DBD) with improved discharge homogeneity, used for direct ozonization and purification of water, is presented here. A special design of the atmospheric DBD system is characterized by incorporation of a porous ceramic segment in the zone between electrodes. This porous segment was placed on the metallic electrode and served as a guide for flowing water. Due to the hydrophilic force it allowed the water to remain undisturbed by the electrical discharge. This feature enabled a reduction of the discharge gap and subsequently an increase in the intensity, stability and homogeneity of the discharge. It was observed that under such a configuration a transition from the filamentary mode to the semi-homogeneous mode of the plasma discharge could be realized. Discharge properties were investigated by the optical emission spectroscopy method and the results showed the domination of nitrogen lines in the UV-A region. Further it was observed that the system can be operated in a wide range of liquid conductivities and under negligible heat deposition to the liquid solution. Finally, the formation of dissolved ozone and hydrogen peroxide in the deionized water was measured and decomposition tests with organic dye were performed.