Denitrification under high dissolved oxygen by a membrane‐attached biofilm reactor

In this study, the inhibition of a membrane‐attached biofilm reactor (MFSB) by oxygen was investigated. Results show that the denitrification rate, under anoxic conditions, of the MFSB was close to that under conditions of DO (dissolved oxygen) as high as 7.7 mg/L in bulk phase. It appears that the inhibition of DO on denitrifying rates is not obvious for the MFSB. Under aerobic conditions, the denitrification rate of a conventional denitrifying reactor decreased to almost one half the rate under anoxic conditions. By preserving stability against DO inhibition, MFSB is a reasonable alternative for a stable denitrification system.