anammox bacteria sequencing

The fluctuating carbon/nitrogen (C/N) ratios and residual oxygen are bottlenecks for practical applications of anammox biofilm processes. Hence, mature anammox biofilm systems in response to fluctuating C/N ratios (0.3, 0.2, and 0.7) under low-oxygen conditions were set up and investigated. Results showed that it could maintain a nitrogen removal efficiency (NRE) of over 75% throughout the experiment. It achieved the highest NRE (82%) at a C/N ratio of 0.3 with the highest and lowest contents of SOD and H2O2, respectively.