双极性脉冲放电等离子体处理染料废水时化学需氧量去除效果相关因素分析

Removal Factor Analysis of Chemical Oxygen Demand by Bipolar Pulsed Discharge in Dye Waste Water with Plasma Treatment

在双极性脉冲放电等离子体用于染料废水的降解过程中,废水化学需氧量(chemical oxygen demand,COD)的变化是在更深层次上反映该技术对有机污染物的降解能力的重要指标。为此,重点研究了在气液固三相混合体双极性脉冲放电条件下典型染料废水COD的去除规律,测试了不同电压、气体流量、初始浓度等条件下染料废水COD的变化。实验结果表明:当负载电压较高时,染料废水的COD值会先升高然后不断降低;而负载电压较低时,COD值会在一定程度内缓慢上升;气体流量越高,COD的去除效果越好;废水初始浓度增加,COD的去除率略有下降;初始电导率增加,COD的去除率降低;对具有不同官能团的染料废水进行放电处理发现,双极性脉冲放电对于各种结构的染料均有良好的处理效果。

The removal rule of chemical oxygen demand （COD） in the typical dye solution was investigated using a packed bed reactor by bipolar pulsed discharge in the air-water-solid mixture, and the value of COD in different conditions such as different voltages, air flow rates and initial concentrations was measured. Experimental results prove that the COD value of dye waste water will increase first and then decrease constantly at a high load voltage, while the COD value increase slowly to a certain extent at a low load voltage. The removal effect of COD is better when the air flow rate is higher and is worse when the initial concentration and conductivity of the dye waste water increase. It is found that the degradation effect on dyes with different functional groups is remarkable after the bipolar pulsed discharge treatment.