Removal efficiency of ammonia nitrogen in wastewater by channel constructed wetland

The study was conducted to evaluate the system performance of channel conducted wetlands (CCW) to remove inorganic ammonium nitrogen (AN) and to discover the change rule of AN in system. The results show that CCW system has high AN removal efficiency, with average efficiencies of 88% and average mass removal rate of (6.94±2.07) gN·m-2·d-1. While the mass removal rate of AN in the third unit was the highest. AN mass removal rate and mass loading rate (MLR) showed significantly linear correlation when AN MLR was lower than 10 gN·m-2·d-1. Yet influent and effluent concentration showed linear correlation significantly as AN MLR was higher than 20 gN·m-2·d-1. The Kv values of each unit and whole system were higher than those of other wetlands. The changes of AN concentration were not consistent with pH values in CCW.