高压电弧放电处理偶氮染料废水

用高压电弧放电产生的低温等离子体对含偶氮染料的废水进行了处理，以甲基橙为例研究了电压幅值、处理时间、溶液初始浓度、溶液初始pH值、投加Fe^2＋和Fe^3＋对染料脱色的影响。实验结果表明，甲基橙浓度为50mg／L时其降解率随时间和电压幅值的增加而增加。溶液初始浓度对染料去除效果影响较为明显，同等条件下初始浓度越低降解率越高。酸性条件下有利于低温等离子体处理甲基橙。Fe^2＋和Fe^3＋对低温等离子体降解甲基橙有一定的催化作用。电压8kV处理3min，Fe^2＋为20mg／L时去除率由89．64％增至99．72％。Fe2（SO4），的最佳投加量为5mg／L（以Fe^3＋计），而FeCl，的最佳投加量为80mg／L（以Fe^3＋计）。

Treatment of azo dye wastewater by high-voltage arc discharge nonthermal plasma

The nonthermal plasma technology using high-voltage arc discharge was investigated for the treatment of azo dye wastewater. Methyl orange solution was selected as the example to investigate the decolorization. The effects of power voltage, plasma-treatment time, different initial concentration of dye solutions, pH and addition of catalysts (Fe²⁺ and Fe³⁺) on the decolorization were studied. The experimental results indicated that abatement of 50 mg/L methyl orange wastewater increased with the discharging time and power voltage. The initial concentration had a significant impact on the removl of dye.Under the same conditions, higher decolorization was obtained when the initial concentration was lower. It was found that the extent of decolorization increased with the decrease of initial pH of dye solutions and the addition of Fe²⁺and Fe³⁺. About 99.72% of dye was removed after 3 min plasma-treatment with concentration of 20 mg/L initial Fe²⁺,at voltage of 8 kV. In the absence of catalyst,the removal of dye reached 89.64%.The best dosage of Fe₂(SO₄)₃ was 5 mg/L (calculated by the concentration of Fe³⁺), while FeCl₃ was 80 mg/L (calculated by the concentration of Fe³⁺).