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BACKGROUND: Electrochemical oxidation has been applied successfully in industrial waste-water treatment. The simultaneous removal of COD Cr and NH 3 -N, as well as the corresponding mechanisms and reaction zone, were examined in this study. The reaction kinetics and the significant factors that affect removal performance were also studied.

Three-dimensional electrode technology shows great potential in wastewater treatment. In this paper, the developments of the technology were systematic introduced.The optimization of feeder electrode or particle electrodes were becoming one of the research focuses of this filed. Several novel particle electrodes including new carbon material and metallic oxides had been widely studied. The mechanisms to degrade pollutants were due to the direct and indirect oxidation, which took place near the electrode area.Furthermore, it was pointed out that high operation cost, feeder electrodes corrosion and particle electrodes inactivation were the main problems of three-dimensional electrode technology. Some corresponding potential solutions for these problems had also been proposed.