低温等离子体技术处理难降解有机废水研究进展

Research progress in organic wastewater treatment by low-temperature plasma discharge technology

等离子体是呈电中性的完全电离气体,分为热等离子体和低温等离子体。低温等离子体具有独特的光、热、电等物理性质,可以产生多种物理过程和化学反应,用于降解生物法难以治理的有机污染物,具有较多优点。在总结国内外文献的基础上,对采用低温等离子体技术处理废水中难降解物质的研究进展进行综述,对脉冲电晕放电、介质阻挡放电、辉光放电和滑动弧放电四种等离子体技术处理难降解有机废水的原理、方法及研究进展进行探讨,总结了该技术在废水处理中存在耗能大、处理对象单一等问题,指出了今后要重点优化工艺、寻求最佳组合、考虑与其他方法结合,发挥其在深度处理以及提高废水可生化性方面的优势。

Plasma is an electrically neutral completely ionized gas,which is divided into hot plasma and low temperature plasma. Low temperature plasma has unique physical properties such as light,heat and electricity,which can produce a variety of physical processes and chemical reactions. It is used to degrade organic pollutants that are difficult to control by biological methods and has many advantages. Based on the summary of domestic and foreign literatures,the research progress of low-temperature plasma technology in organic wastewater treatment by low-temperature plasma discharge technology is summarized. The principles,methods and research progress of pulse corona discharge,dielectric barrier discharge,glow discharge and sliding arc discharge in treating refractory organic wastewater are discussed. The problems of large energy consumption and single treatment object in wastewater treatment of this technology are summarized. It is pointed out that in the future it is necessary to focus on optimizing the process,seeking the best combination,considering the combination with other methods,and giving full play to its advantages in advanced treatment and improving the biodegradability of wastewater.