the same NH4
þ-N load (about 100 mg/L) (6). Furthermore, for Bacillus
sp. LY (16) and Pseudomonas alcaligenes AS-1 (17), the
ammonium removal rates were just 0.43 mg-N/L/h and 1.15 mg-N/
L/h, respectively, which were significantly lower than that of the
present study. TN was removed by 87.8% from the medium in 22 h,
indicating the heterotrophic nitrogen removal capability by Acinetobacter
sp. Y1.