Abstract
In this research, polluted river water (PRW) was treated with clean and efficient electrochemical technology. The working condition adaptation of the coating electrodes was evaluated through orthogonal tests, which could reduce the number of times of experiments and save raw materials. The results indicated that when current density was 10 mA/cm2, anode diameter was 8 cm, electrolyte solution concentration was 2 mg/L and electrolysis time was 30–40 min, the removal rates of chemical oxygen demand (COD) and ammonia nitrogen (NH3–N) could achieve the optimal value. Besides, the surface characteristics of the coating electrode were evaluated through scanning electron microscope (SEM) and energy depressive spectrum (EDS), while voltammetry curves and tafel curve were applied to the verification of electrode characteristics. The results showed that Ti/IrO2–Ta2O5 coating electrode exhibited a favorable electrochemical performance. Electrical energy per mass (Esp) and operation cost for the treatment of PRW were calculated. The experiment results showed that Ti/IrO2–Ta2O5 coating electrode could be applied to the removal of pollutants from PRW as an effective clean technology.
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