Partial nitrification and denitrification process was successfully achieved.
High nitrogen removal and nitrite accumulation was obtained with 5.0–37.7 g NaCl/L.
Ammonia oxidation process was inhibited at high salt concentration of 41.9 g NaCl/L.
AOA was stimulated at the salinity of 9.0–25.1 g NaCl/L.
High NIRA and NARA were obtained at the salinity of 5.0–16.8 g/L.