Results and conclusions
The nitritation efficiencies in the Counter diffusion biofilm did not vary significantly for the applied pressure range even though oxygen concentrations at the membrane base and oxygen fluxes were different. Examples of typical profiles at the different pressures are shown in Figure 4 with the respective fluxes and nitritation efficiencies (Table 1).
This study demonstrated the challenges in achieving nitritation in MABRs and the importance of careful determination, adjustment, and monitoring of oxygen and ammonium fluxes and their respective absolute concentrations. Further research should focus on finding the optimal biofilm thickness and oxygen penetration depth for nitritation MABRs taking into account the impact of absolute concentrations of oxygen and the nitrogen species.
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