脉冲电晕放电等离子体降解4-氯酚废水的研究

Study of Degradation of p-Chlorophenol in Aqueous Solution with Pulsed Corona Discharge Plasma

在废水中进行直接高压脉冲电晕放电产生的非平衡等离子体可以有效地氧化降解水溶液中的有机物。研究表明,在不同的放电条件下废水溶液中4-氯酚的降解过程均符合一级反应,即C=C0e-kt。提高脉冲峰压和放电频率可以提高4-氯酚的降解速率,而增大放电电极与接地电极间的距离将严重降低4-氯酚的降解速率。在一定的放电条件下,4-氯酚降解速率常数k与脉冲峰压Vp、放电频率f和放电距离l的关系符合:k=10-8(Vp)4.22、k=4.78×10-6 f 1.81和k=-1.184×10-2lnl+0.02153。

Organic compounds in the aqueous solution can be degradated efficiently through the oxidation reactions of p-chlorophenol and non-thermal plasma formed due to the direct pulsed high-voltage corona discharge in the wastewater. Investigation showed that the degradation of p-chlorophenol in wastewater with various discharge parameters is a first-order reaction, C=C0e-kt. The degradation rate of p-chlorophenol can be increased by increasing the peak voltage Vp and the repetition rate of pulse f. However, increasing the distance l between the discharge electrode and the ground electrode will decrease severely the degradation rate of p-chlorophenol. When certain discharge parameters are applied in degradation, the degradation rate constant k of p-chlorophenol could be described as: k=10-8 (Vp)4.22, k=4.78×10-6 f1.81, and k=-1.184×10-2lnl+0.02153.