This study describes the isolation and characterization of a novel bacterium for ammonium removal under aerobic conditions. Twelve ammonium remover strains were isolated from wastewater of a local fertilizer industry. The isolated strains were initially screened using solid media for their nitrifying activities. | Ammonia-removal efficiency of a novel acinetobacter calcoaceticus strain isolated from industrial wastewater of Ninh Binh coal nitrogenous fertilizer plant