Study on the effects of NO3−-N and NO2−-N on Denitrifying phospate removal bacteria

This experiment was investigated and compared the effects of NO₃^--N and NO₂^--N on the anaerobic phosphorus release and anoxic phosphorus uptake of Denitrifying Phosphate Removal Bacteria(DPB).The results showed: with the concentration of NO₃^--N and NO₂^--N increased in the Anaerobic stage, the amount of phosphorus release decreased. In the Anoxic phase, When the concentration of NO₃^--N is 40mg / L removal of NO₃^--N and phosphorus worked best, the removal rate respectively reached to 98.4% and 97.2%; The DPB had not been Acclimated by NO₂^--N could still use NO₂^--N as the electron acceptor, when NO₂^--N is 20mg / L, phosphorus concentration of effluent was 14.42 mg / L, Removal rate was 59.13%, the phenomenon of Denitrifying Phosphorus can still happen when the concentration of NO₂^--N ≤ 30mg / L, anoxic phosphate uptake were severely inhibited until the concentration of NO₂^--N reached 40mg/L, the removal rate of NO₂^--N was only 32.25% in 4 hours.