Nitrogen removal in a sequencing batch biofilm reactor with liquid circulation: effect of feed strategy and carbon source in the denitrifying step - Canto, Catarina Simone Andrade do; Ratusznei, Suzana Maria; Rodrigues, José Alberto Domingues; Zaiat, Marcelo; Foresti, Eugenio (Afinidad : revista de quimica teorica y aplicada, 2010)