Fig. 3

Time series for the concentrations of ammonium, nitrite and nitrate in the activated sludge of the aeration tank in Xinfeng WWTPs. Error bars represent standard variation (SD, nā=ā3)
Time series for the concentrations of ammonium, nitrite and nitrate in the activated sludge of the aeration tank in Xinfeng WWTPs. Error bars represent standard variation (SD, nā=ā3)