不同催化剂载体催化氧化技术处理钨冶炼COD废水

Tungsten Smelting COD Wastewater Catalyzed by Different Catalyst Support Catalytic Oxidation Technology

采用浸渍焙烧法制备了Fe-Ce/活性氧化铝、活性炭、陶粒、沸石和高岭土催化剂,并用于催化臭氧降解钨湿法冶炼废水。在单因素试验的基础上,以COD去除率为考核指标,考察了催化剂焙烧温度、臭氧投加量、废水pH、催化剂投加量、反应时间和反应次数的效果。试验表明,在臭氧投加量均为700mg/L下,在最优条件下COD去除率分别为80.9%、74.2%、69.5%、85.9%和66.6%。以该物质为催化剂载体,COD去除率从大到小依次排列为:沸石、活性氧化铝、活性炭、陶粒、高岭土,综合考虑经济成本和COD去除率来比较从优到次依次排列为:活性氧化铝、沸石、活性炭、陶粒、高岭土。

Fe-Ce/activated alumina,activated carbon,ceramsite,zeolite and kaolinite catalysts were prepared by impregnation calcination method and applied for catalytic ozonation of tungsten hydrometallurgical wastewater.Based on single factor tests and applying COD removal rate as evaluation index,effects of five factors including roasting temperature,ozone dosage,pH value of wastewater,catalyst dosage,reaction time and reaction numbers were investigated.The results show that COD removal rate is 80.9%,74.2%,69.5%,85.9%and 66.6%,respectively with ozone dosage of 700 mg/L under the optimal conditions.In terms of COD removal efficiency,the sequence is zeolite>activated alumina>activated carbon>ceramsite>kaolin,and in terms of price and COD removal rate,the sequence is zeolite activated alumina>zeolite>activated carbon>ceramsite>kaolin.