ANALYSIS OF COATING ELECTRODE CHARACTERISTICS IN THE PROCESS OF REMOVING POLLUTANTS FROM WASTEWATER

In this paper, prepared coating electrodes were applied to remove the organic pollutants and ammonia nitrogen from wastewater taken from wastewater treatment plant. Meanwhile, preparation technology and characteristics of coating electrodes were discussed. The experimental results indicated that Ti/Ru/Ir electrodes were suitable for removing organic pollutants. Moreover, the removal effects for COD and ammonia nitrogen using the coating electrodes were evaluated under different reaction conditions. Under the condition when current density was 6-8mA/cm(2), the wastewater was weak acid or neutral condition, and electrolysis time was 30-45 minutes, the removal rates of COD and ammonia nitrogen could achieve the optimal value. In addition, surface characteristics of coating electrodes were analyzed through SEM and EDS in the experiments. The research also shows that the corrosion potential of Ti/Ru/Ir coating electrode was relatively higher than electrodes with coating of other metals, such as iron, zinc, etc., and its resistance of corrosion was much stronger than ordinary metal coating.