In this study, we designed an air stripper for removal of ammonia in both synthetic and leachate wastewater. The effects of pH, hydraulic loading rate (HLR), gas/liquid (G/L) ratio, and recirculation of liquid on the ammonia stripping efficiency were investigated. The results show that rising pH from 9 to 12 increased significantly ammonia removal efficiency, irrespective of the changes of G/L or HLR. |