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Application of membrane bioreactor for completely autotrophic nitrogen removal over nitrite (CANON) process
- Zhang, Xiaojing, Li, Dong, Liang, Yuhai, Zhang, Yulong, Fan, Dan, Zhang, Jie
- Chemosphere 2013 v.93 pp. 2832-2838
- air flow, ambient temperature, bacteria, biofilm, bioreactors, fluorescence in situ hybridization, nitrogen, sludge
- A membrane bioreactor (MBR) was adopted for completely autotrophic nitrogen removal over nitrite (CANON) process at ambient temperature. CANON was rapidly started-up within around 50d under oxygen-limited condition. The average nitrogen removal rate reached to 0.70kgNm−3d−1 with a removal efficiency of 88%. The ratio of air flow rate to volumetric ammonium loading rate should be maintained below 0.28Lairmin−1kg−1Nm3d for stable CANON. The feasibility of MBR for CANON process was proved in batch experiments. FISH results showed that aerobic ammonium-oxidizing bacteria predominated in the reactor sludge, whereas anaerobic ammonium-oxidizing bacteria predominated in the membrane biofilm. This study demonstrated that MBR was a suitable experimental setup for the operation of CANON process.