Effect of electron donors on anammox coupling with nitrate reduction for removing nitrogen from nitrate and ammonium

► Anammox coupled with NO3- reduction was stimulated by addition of swine wastewater, acetate, hydrogen and iron. ► No inhibitory effect on anammox in a medium with NO2-/NH4+ was induced by these electron donors, except for iron. ► Swine wastewater carried an exponential increase in denitrification under high concentrations. ► Hydrogen did not carry an increase in denitrification even when its addition was increased.