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Changes in nitrogen species (NH4+-N, NO2−-N, and NO3−-N) concentration with time under aerobic/anoxic (1 h/1 h) conditions and in the presence of different PhACs inlet concentrations [(a) 0.16 mg L−1, (b) 0.40 mg L−1, (c) 1.78 mg L−1, and (d) 3.51 mg L−1].
