Simultaneous nitrification and denitrification coupled with phosphorus removal in an modified anoxic/oxic-membrane bioreactor (A/O-MBR).

Abstract In this study, simultaneous carbon, nitrogen and phosphorus (PO 4 3− -P) removals using an anoxic/oxic-membrane bioreactor (A/O-MBR) system without any circulation was investigated. The total nitrogen (TN) removal efficiency was above 84.6%, and the average removal efficiencies of COD and PO 4 3− -P were 94.6 and 90.0%, respectively. Ammonium (NH 4 + -N) removal without nitrite (NO 2 − -N) and nitrate (NO 3 − -N) accumulation in the reactor suggested that simultaneous nitrification and denitrification (SND) occurred. The phosphorus-accumulating organisms (PAOs) accumulated in the reactor. AnOx/Oxic test indicated that intracellular organic carbon might be utilized as denitrification electron donor in nitrogen removal process.

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