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Impact of Dissolved Oxygen and Anoxic Decay on the Longterm OModeling of Simultaneous Nitrification and Denitrification (SNdN) in a Pilot Scale MBR

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This study is mainly focused on evaluating the impact of dissolved oxygen and anoxic decay on simultaneous nitrification and denitrification (SNdN) in a pilot scale membrane bioreactor (MBR). Nitrate utilization rates for anoxic and MBR tanks were calculated from a previously calibrated model to quantify the effect of each tank on the total nitrogen removal capability of the system. The total average nitrate utilization rate (NURt) in the membrane tank was 2.3 mg/L-h (4.6 gN/kgVSS-d) throughout the study where 65% of this was associated with the anoxic decay process having the major contribution to SNdN. The denitrification potential (NDP) of the MBR tank corresponded to 75% of the total NDP of the system at an average DO level of 1 mg/L and decreased with increasing DO. The comparative steady state modeling revealed that MBR systems have the potential to provide 60% more total nitrogen removal efficiency at a DO level of 2 mg/L when compared to conventional systems with the same operating parameters. It was found that in a MBR system the existence of the anoxic tank is questionable at low DO concentrations because of the low levels of nitrate being recirculated back to the this tank due to the high NDP in the membrane tank.

Keywords: denitrification potential; diffusion limitation; membrane bioreactor; nitrate utilization rate; simultaneous nitrification/denitrification

Document Type: Research Article


Publication date: 2009-01-01

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