Removal of Ammonia Nitrogen in Wastewater by Indirect Mechanism Using Electrochemical Method with Platinum Electrode as Anode

Abstract

In this study, platinum (Pt) electrode was used as an anode to remove ammonia in the wastewater by electrolysis. The batch experiments were carried out with various ammonia concentrations in the synthetic wastewater at ambient temperature with and without chloride ions. The results indicated that the optimal condition was pH = 7.0 and current density of 10 mA/cm2. The added NaCl concentration had a significant effect on both, the ammonia removal rate and energy consumption. The ammonia removal performance was 99% with initial ammonia concentration of 25 mg/L after 70 min electrolysis at i=20 mA/cm2; pH 7.0 and 0.03% NaCl. The response functions described the correlation of four variables with NH3 concentration, and NH3 removal efficiency was determined by the response surface methodology (RMS), ANOVA tool with R2 NH3-N = 0.945 and R2 Eff = 0.871.