低温等离子体与絮凝剂处理印染废水的协同效应

采用低温等离子体和絮凝剂协同处理印染废水.结果表明,染料废水脱色率和COD去除率随输入电压增大和放电时间延长而增加;电极间距、废水初始浓度、通入空气流量等因素对印染废水处理效果也有很大影响;气相中放电效果优于液相中放电,阳极电极在液面以上8mm左右时放电效果最好,在其他条件不变情况下随废水初始浓度和通入空气流量增大废水脱色和COD脱除率先增大再减小,有一最佳峰值.印染废水先经过等离子体处理后再加入絮凝剂处理效果优于先加絮凝剂后放电、仅有等离子体放电的过程.在本实验中初始浓度200mg/L(CODCr初始值572)印染废水在外加电压40kV、放电时间20min、电极间距8mm、通入空气流量16L/h条件下,与絮凝剂PAC相互协同作用可达到96%脱色率、63%COD去除率.

Cooperation effect between non-thermal plasma and flocculants for treatment dyeing wastewater

The cooperation effects of non-thermal plasma assisted with flocculants to clean dyeing wastewater have been investigated in this paper. The new way can shorten the dealing time and improve the rate of de-colorization and de-COD. The results showed the de-colorization and de-COD ratios increased with the increasing of input voltage and discharge time. The distance between discharge electrodes, initial concentration of dyeing wastewater and air flow to input wastewater have a significant impact on purification efficiency. The effect of discharge in gas phase is better then in liquid phase. When the anode pole is up the water level about 8mm the treatment can get good result. When the other operation conditions are unchanged, the ratio of de-colorization and de-COD increased and then decreased with the increasing of the initial concentration and air flow. The initial concentration and air flow has a peak value, respectively. The effect of dyeing wastewater treatment by adding flocculants into wastewater after discharged is better than by putting flocculants before discharged and only by plasma discharged. In this experiment when the wastewater initial value of CODcr is 572, input voltage 40kV, discharge time 20min, the anode pole up level 8mm, air flow 16L/h and associates with flocculants the ratio of de-colorization and de-COD reach 96% and 63%, respectively.