Abstract：Large quantities of refractory organic matters still leave in the coking wastewater after biological treatment, making wastewater not meet the requirements of discharge or recycling. In the present study, activated carbon was applied as carrier. Five kinds of particle electrodes that were loaded with single elements of Ni, Fe and Co and binary elements of Ni-Fe and Co-Fe, were prepared and used to degrade the simulated coking tail-wastewater. The results showed that the particle electrodes loaded with binary elements achieved better treatment effects than those loaded with single elements. Ni-Fe/PAC possessed the best degradation performance among the electrodes, with COD and TOC removal efficiency of 70.1% and 40.1%, respectively. Ni-Fe/PAC also possessed the highest oxygen evolution potential and the lowest Tafel slope, namely 2.25V and 86mV/dec, respectively. The crystal structure was consisted by metallic Ni and Fe and small amount of iron oxide. The addition of particle electrodes resulted in the effluent to be alkaline. The loading Co increased the alkalinity, while the Fe was beneficial to reduce the pH value of effluent. The degradation effects of the three category organics in simulated wastewater were in the order of polycyclic aromatic hydrocarbon < heterocyclic compound < benzene series during Ni-Fe/PAC processes. Ni-Fe/PAC can catalyze the generation of ·OH and new atomic hydrogen. The degradation of organic matters was mainly fulfilled through indirect oxidation.
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