脉冲电流处理印染废水的研究

研究了高压脉冲电流对几类典型染料废水的处理效果。试验结果表明 :高压脉冲电流可以有效地破坏试品中染料分子的发色基团 ,脱色效果明显 ;处理后的试品 ,包含沉淀废水的化学需氧量 (COD)值明显升高 ,所以需要利用金属氢氧化物的絮凝作用来最终降低试品的COD值 ;

电化学法处理染料废水的研究

染料废水的处理是近年来各国环境领域的一个热点和难点。笔者采用电化学法处理染料废水,探讨了不同电极、不同电极间距和不同电解槽对染料降解效果的影响。结果表明,网状电极和带孔电极比板状电极的效果更为显著,其中8目铁网的效果最佳;缩短电极间距,可加快电解反应速度,同时降低温升,减少能耗;圆筒形电极电解槽比传统矩形电解槽反应效果好。电化学法对染料废水的COD和色度的去除非常有效,是一种非常有实用前途的处理方法。

超声技术降解染料废水的实验研究

针对实际印染废水高浓度、高毒性、高 COD值的特点 ,采用探头式功率超声发生器和自制平板超声发生器降解多种高浓度染料废水实验的结果表明 ,降低超声辐射声强及增大辐射有效面积可降解染料并增大处理废水的体积。

脉冲电压处理染料废水

研究了脉冲电压应用于处理染料废水的可行性以及处理效果。结果表明,处理过程中,合理的电导率对色度的去除起决定作用。试验确定的染料废水的脉冲电压处理条件为:脉冲幅值700V,脉宽4～10μs,频率50Hz,电导率在9mS/cm以上。经过10min处理后,色度去除率可达78%以上。从紫外和可见光谱图可以看出,脉冲电压处理10min后,染料的发色基团基本被破坏,染料浓度大幅度下降。

高压脉冲放电降解染料废水的实验研究

染料废水是水处理领域的重点和难点。该文分别使用棒棒电极和多针 -板电极系统 ,基于水中脉冲放电法 ,研究了高压脉冲电流对多种典型染料废水的处理效果。实验表明 ,经过高压脉冲放电处理后 ,染料废水脱色效果明显 ,同时其试品含沉淀后的清液化学需氧量 T- COD值有明显升高。这说明高压脉冲放电所产生的臭氧、超声以及紫外辐射等可以有效地破坏染料废水中染料分子的发色基团和染料分子中的苯环以及萘环 ,有利于提高染料溶液的可生化性。但是电极形状对不同类型染料废水的处理效果有着一定影响。研究说明高压脉冲是处理染料废水潜在的有效途径。

Air Breakdown During Fires

This paper analyzes the different discharge processes occurring at normal temperatures and high temperatures. The theoretical results show that the net charges in the streamer channel at normal temperatures are zero, but they are positive at high temperatures so that the advancing field is reinforced more than that at normal temperatures. Therefore, the field required for streamer propagation is reduced at high temperatures. The sparkover voltage is largely reduced with increased temperature, which is influenced by the solid materials in the flame.

Air Breakdown Behavior of Two Series Gaps for Composite Switching Impulse/Alternating Voltage

More and more high voltage transmission lines make use of rubber housed ZnO arresters in series with another air gap (for example, the insulator gap) as lighting protection elements. Many test results of ZnO arresters protection performance show that this insulation arrangement is suitable for practical lines according to results based on only simple impulse voltage. This paper uses a composite voltage (switching impulse voltage/alternating voltage) to determine the air breakdown behavior of the conductor rod gap in series with the sphere gap. In the test, the switching impulse voltage is applied to the conductor while the alternating voltage is applied to the rod and one sphere and the other sphere is grounded. The results show that in some cases, the value of the U 50% sparkover voltage for the conductor rod gap with the composite voltage is nearly only half of that for just the simple impulse voltage.