低温等离子体协同絮凝剂净化印染废水

Decontamination of Dyeing Wastewater by Non-thermal Plasma with Flocculants

采用针-板式反应器,研究探讨低温等离子体协同絮凝剂处理印染废水色素和COD的影响规律。试验首先探讨了低温等离子放电条件(放电电压、放电时间、放电间距)对印染废水色素和COD处理效果;其次研究在最佳的低温等离子放电条件下,加入絮凝剂对印染废水色素和COD处理的协同作用。结果表明印染废水的脱色率和COD脱除率随输入电压的增大和放电时间的延长而增加;放电介质及放电间距对净化效率也有重要影响,在气相中放电的脱色率优于在液相中放电,COD的脱除率随放电间距的增加而降低。最佳工艺参数为放电电压20kV、放电时间20min、放电间距为阳极在液面以上约12mm,先经过等离子体放电再加入絮凝剂的废水净化效果优于先加絮凝剂再放电的工艺过程。

The effect of dyeing wastewater pigments ann COD treatment in needle-plate reactor by nonthermal plasma with flocculants was studied. At first, the influence of discharge conditions of non-thermal plasma （discharge voltage, discharge time, discharge distance） on dyeing wastewater pigments and COD treatment was discussed; then the synergy effects of added flocculants to dyeing wastewater pigments and COD treatment were investigated under the best discharge conditions. The results showed that the rates of decolorization and COD removal increase with increase of input voltage and discharge time ; the medium and the distance of discharge have a significant influnce on deontamination efficiency, the decolorization rate is higher when discharge in gasous medium than in liquid medoum, COD removal rate decreases with increase of discharge distance. The optimal process parameters, are as the following： discharge voltage 20kV, discharge time 20 min, and distance between anode and the water surface is about 12mm. The effect is better when adding flocculants after plasma discharge than adding flocculants before plasm discharge.