Figure 1: The N removal performance in the SBBR.

(A) The TN removal efficiency during a recent month; (B) The concentrations of NH4+-N, NO2−-N, NO2−-N and TN in a cycle; and (C) the N2O emission in a cycle.
(A) The TN removal efficiency during a recent month; (B) The concentrations of NH4+-N, NO2−-N, NO2−-N and TN in a cycle; and (C) the N2O emission in a cycle.