为提高臭氧处理制浆废水的效果,分别以活性炭(AC)、氧化铝(A12O3)和溶胶一凝胶法制备的TiO2/AC、TiO2/A12O3为催化剂催化臭氧处理制浆废水,采用扫描电镜和X-射线衍射仪对催化剂进行表征.结果表明:AC、AA12O3、TiO,/AC和TiO2/A12O3均具有催化性能,可有效提高臭氧对制浆废水化学需氧量(CODCr)和色度的去除效果.动力学分析表明,AC、TiO2/AC、A12O3和TiO2/A12O3催化臭氧处理制浆废水的过程中,CODCr降解的反应符合表观二级动力学方程,负载的TiO2提高了反应的动力学速率常数.气相色谱一质谱联用分析表明,臭氧及催化臭氧处理能有效降解去除漂白废水中的烷基苯类、酯类和氯代烃类等有毒有机污染物.
In order to improve the treatment efficiency of pulping effluent with ozone, activated carbon ( AC), alumina and their compounds TiO2/AC and TiO2/A12O3 prepared via the sol-gel method were respectively used as catalysts to enhance the treatment, and the catalysts were characterized by means of SEM and XRD. The results indicate that the four kinds of catalysts all possess catalytic ability and effectively improve the removals of chemical oxygen demand (CODcr) and ehroma of the effluent. Kinetics analysis shows that, with the catalysis of the four kinds of catalysts, the CODcr degradation process follows the apparent second-order kinetic equation; and that the TiO2 loaded on AC or AI2O3 helps to improve the reaction rate constant. Moreover, GC-MS results indicate that both the ozonation and the catalytic ozonation are effective in degrading the toxic organic compounds in the effluent such as alkyl benzenes, esters and chlorinated hydrocarbons.