活性炭复合材料负载催化剂催化臭氧氧化处理石化废水

采用催化臭氧氧化深度处理某石化厂炼油废水,制备了活性炭复合材料负载催化剂(Fe_2O_3/ACNT),与几种常见负载催化剂进行了物性和COD去除效果的对比,并对Fe_2O_3/ACNT的催化效果和稳定性进行了详细分析。结果表明:催化剂的催化臭氧氧化活性由高到低的顺序为Fe_2O_3/ACNTFe_2O_3/活性炭Fe_2O_3/Al2O3Fe_2O_3/陶粒;Fe_2O_3/ACNT催化剂具有较高的比表面积、孔体积、强度和吸水率,使COD去除率由单独臭氧氧化时的约20%提高到66.8%。在催化剂填充量200 m L、废水pH 7.6、臭氧投加量200 mg/L、体积空速1 h~(-1)的条件下运行30d,COD去除率平均达65.1%,出水COD均值为40.8 mg/L,最高值为44.3 mg/L,满足外排水COD小于50 mg/L的指标。催化剂稳定性良好,运行30 d活性未见明显降低,具有在环保领域应用的前景。

Treatment of petrochemical wastewater by catalytic ozone oxidation with activated carbon composite supported catalysts

The petrochemical wastewater was treated by catalytic ozone oxidation. The activated carbon（AC）composite supported catalyst（Fe₂O₃/ACNT）was prepared and compared with several common supported catalysts on physical properties and COD removal effect. The catalytic effects and stability of Fe₂O₃/ACNT were analyzed. The results showed that：The order of catalytic ozone oxidation activity of the catalysts was Fe₂O₃/ACNT > Fe₂O₃/AC > Fe₂O₃/Al₂O₃ > Fe₂O₃/ceramic;Because of the higher specific area,pore volume,strength and water absorption,Fe₂O₃/ACNT could increase the COD removal rate from about 20% of ozone oxidation alone to 66.8%;Under the conditions of catalyst loading 200 mL,wastewater pH 7.6,ozone amount 200 mg/L,space velocity 1 h^-1 and running time 30 d,the average COD removal rate was 65.1%,the average effluent COD was 40.8 mg/L and the highest value was 44.3 mg/L,which met the drainage standard （COD≤50 mg/L）. The catalyst had good stability without significant activity reduction in 30 d of operation,which showed a favorable application prospect in environmental protection.