Removal of NH₃ from leachate by electrochemical oxidation treatment

Electrochemical oxidation process is a promising treatment technology for the degradation of organic pollutants in water samples. Few studies demonstrated that the electrochemical oxidation process plays a key role on the removal of NH3 from leachate. The removal efficiency of NH₃ increases with applied voltage very significantly, suggesting a very important role of mediated oxidation process. Furthermore, pH and electrolyte are also participated strongly to enhance the removal of NH₃ in leachate. To optimize the operating conditions, the effects of NaCl concentration, applied voltage, and pH of the solution were investigated statisticall by one-way ANOVA; all factors were found as a significant factor with ! = 0.05 lower than 95% confidence level. However, the consumption energy was considered during electrochemical oxidation process. In chloride media, consumption energy is the lowest (33 kW h mg−¹), at 0.086 mol L−¹ NaCl and 10 V, with high removal percentage of NH₃ which is 48%. In case of applied voltage, only 53% of NH₃ has been removed consuming more than 50 kW h mg−¹ after 105 min at 0.043 mol L−¹ NaCl and 20 V. All results are treat d statistically by applying one-way ANOVA, interval confidence 95% and P-value 0.05.