石英砂负载纳米TiO2薄膜处理印染废水的实验研究

An experimental study on dying wastewater treatment by using the nanometer-sized TiO_2/quartz sand films

采用石英砂负载纳米TiO2薄膜,在3种不同的光源下对印染废水进行光催化处理。选取光照时间、印染废水pH值、初始CODCr值和H2O2(30%)投加量4个因素分别进行平行实验,以CODCr和色度的去除率为评价指标,确定了各个因素的最佳值。实验结果表明,光源和光强对印染废水的光催化降解效率有很大影响,印染废水在自然光下CODCr最高去除率为10.2%,而在低压和高压紫外光时去除率相近,最高可达43.4%;但CODCr去除率相近时,低压紫外光的光照时间为4 h,高压紫外光仅为40 min。高压紫外光下进行动态实验,实验结果表明,40 min时CODCr去除率达到77.3%,此值远远大于静态实验的CODCr去除率。

Photocatalytic degradation of actual dying wastewater had been studied by using the nanometersized TiO2/quartz sand films in three different light sources. The parallel experiment selected the time of illumination, pH, initial CODCr and volume of H2O2 （ 30% ） respectively to get optimal value of every factor, which based on the removal of CODCr and chrominance. The result showed：the source and intensity of light had the great influence on the efficiency of photocatalytic degradation. The highest removal of CODCr was 10.2% in natural light,but 45.4% in low and high-vohaged UV rays. With the close removal of CODCr, the time of illumination was 4 h and 40 min respectively. The dynamic experiment was in highvoltaged UV rays. The result showed：removal of CODCr reached 77.3% ,which was much bigger than the static.