催化臭氧化法深度处理印染污水的实验研究

采用浸渍法制备的MnOx/Al2O3作为催化剂,对生化处理后的低浓度印染污水进行催化臭氧氧化深度处理。实验考察了多种因素对COD去除率的影响。催化活性最高的工艺条件是:初始pH值为3.0,粒径为2~3 mm,催化剂投加量为50 g。叔丁醇的加入降低了COD的去除率,催化剂作用的机理包括两种途径:催化臭氧氧化分解产生了高活性自由基和催化剂吸附有机物,形成较强的亲核部位。催化剂重复使用次数的实验表明,锰溶出导致催化活性降低。

Study on advanced treatment of dyeing wastewater by catalytic ozonation process

Dyeing wastewater from biological treatment tank is oxidated by catalysed ozonation process with MnOx/Al2O3,which are prepared by the impregnation of γ-alumina.Several effects on COD removal rate are investigated,the process of the highest catalytic activity are as follows:initial pH value is 3.0,particle diameter is 2～3 mm;catalyst dosage is 50 g.COD removal rate was reduced for adding of tertiary butanol,the possible mechanism of MnOx/Al2O3 catalytic ozonation is decomposition of ozone to produce hydroxyl radical and absorb organic matter,forming electrophilic center.The experiment of catalysts used repeated show that the leaching of manganese lead to the reduction of catalytic activity.