The catalytic particle electrode of granular activated carbon coated by iron and cobalt (Fe-Co/GAC) was prepared by the impregnation-calcination method.The results of X-ray diffraction,field emission scanning electron microscopy and energy spectrum instrument,and the N2 adsorption-desorption curves showed that:the loaded catalytic component was mixed crystal type of Fe3 O4 and CoFe2 O4,and the quality percentage of Fe and Co element on the GAC surface were 7.4 ％ and 3.2 ％,respectively.No significant changes were observed on the adsorption behavior of GAC after loading.Two serial apparatus filled Fe-Co/GAC particle electrodes were applied to oxidize the coking wastewater from biological treatment.Under the hydraulic retention time of 20 min and the current 0.2 A,the results showed that the effluent COD of the first and second apparatus were attained 75.8-79.1 mg/L and 42.6-44.8 mg/L,respectively.The average COD removal efficiency were attained to 54.4％ and 74.2％,respectively.And the final treatment effect increased 10.5 percentage relative to GAC.At the same time,the study of different current combination conditions indicated that an optimum current matching applied to the two serial apparatus was observed.When the current of the first apparatus was reduced to 0.2 A and the current of second apparatus was increased to 0.6 A,the best removal efficiency of COD and the lowest energy consumption were achieved.%采用浸渍-焙烧法制备了负载铁钴复合催化元素的活性炭(Fe-Co/GAC)粒子电极.X射线衍射、场发射扫描电子显微镜及能谱仪、N2吸附脱附曲线等分析表明:负载的催化组分是Fe3O4和钴铁氧体(CoFe2O4)的混合晶型;Fe和Co元素在颗粒活性炭(GAC)表面元素的质量分数分别为7.4％和3.2％;GAC负载前后吸附行为没发生明显变化.以Fe-Co/GAC作为粒子电极,使用两级串联电催化反应装置处理焦化废水生化尾水,结果表明,在两级反应装置水力停留时间都为20 min、电流都为0.2A时,第一、二级反应装置出水COD分别在75.8～79.1、42.6～44.8 mg/L,平均去除率分别达到54.4％和74.2％,处理效果相对于GAC提高了10.5百分点.同时,不同电流组合条件表明,两级反应装置的电流条件存在最佳匹配关系,适当降低第一级反应装置电流至0.2A,并适当增加第二级反应装置电流至0.6 A,可获得较佳的COD去除效果,以及较低的能耗.
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