高盐废水处理臭氧催化剂制备及工艺性能研究

Study on preparation and process performance of ozone catalyst for high salt wastewater treatment

为开发出适用于煤化工高盐废水的高效臭氧催化剂,采用混合法制备催化剂,研究载体、活性组分、黏结剂、催化助剂等对COD去除效果的影响,确定最佳臭氧催化剂;开展催化剂物性表征,研究催化剂表观形貌及活性组分形态;开展煤化工高盐废水臭氧催化氧化实验,确定最佳工艺参数;最后对催化剂开展连续实验,评价催化剂的稳定性。结果表明:最佳催化剂的制备条件为活性氧化铝为载体,锰为活性组分,硅酸钠为黏结剂,陶土为催化助剂;经催化剂表征分析,可知锰以α-MnO_(2)形态均匀地负载在催化剂表面及孔道内;最佳工艺参数为臭氧流量1.5 L/min,臭氧质量浓度200 mg/L,催化剂投加量0.8 L/L;在最佳工艺参数下开展连续实验100 h时,COD去除率稳定在47%~49%,即催化剂稳定性良好。

In order to develop an efficient ozone catalyst suitable for high salt wastewater of coal chemical industry,the mixed method was used to prepare the catalyst,and the impacts of carrier,active components,binder and cocatalyst on COD removal were studied to determine the best ozone catalyst.The physical properties of the catalyst were characterized to study the apparent morphology and active component morphology of the catalyst.The experiment of ozone catalytic oxidation of high salt wastewater from coal chemical industry was carried out to optimize the best process parameters.Finally,continuous tests were carried out to evaluate the stability of the catalyst.The results showed that the preparation conditions of best ozone catalyst were as follows:activated alumina as the carrier,manganese as the active component,sodium silicate as the binder,clay as the cocatalyst.The catalyst characterization analysis showed that manganese was uniformly loaded on the catalyst surface and in pore channel in the form ofα-MnO_(2).The optimum process parameters were as follows:ozone gas flow rate 1.5 L/min,ozone concentration 200 mg/L,catalyst dosage 0.8 L/L.Under the optimal process parameters,the continuous test was carried out for 100 h,and the COD removal rate was stable at 47%-49%,showing good catalyst stability.