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. 2022 Jun;119(6):1426-1438.
doi: 10.1002/bit.28054. Epub 2022 Feb 22.

Dynamic modelling of N2 O emissions from a full-scale granular sludge partial nitritation-anammox reactor

Xinyu Wan  1 , Eveline I P Volcke  1
Affiliations

Dynamic modelling of N2 O emissions from a full-scale granular sludge partial nitritation-anammox reactor

Xinyu Wan et al. Biotechnol Bioeng. 2022 Jun.

Abstract

Partial nitration-anammox is a resource-efficient pathway for nitrogen removal from wastewater. However, the advantages of this nitrogen removal technology may be counter-acted by the emission of N2 O, a potent greenhouse gas. In this study, mathematical modelling was applied to analyse N2 O formation and emission dynamics and to develop N2 O mitigation strategies for a one-stage partial nitritation-anammox granular sludge reactor. Dynamic model calibration for such a full-scale reactor was performed, applying a one-dimensional biofilm model and including several N2 O formation pathways. Simultaneous calibration of liquid phase concentrations and N2 O emissions leads to improved model fit compared to their consecutive calibration. The model could quantitatively predict the average N2 O emissions and qualitatively characterize the N2 O dynamics, adjusting only seven parameter values. The model was validated with N2 O data from an independent data set at different aeration conditions. Nitrifier nitrification was identified as the dominating N2 O formation pathway. Off-gas recirculation as a potential N2 O emission reduction strategy was tested by simulation and showed indeed some improvement, be it at the cost of higher aeration energy consumption.

Keywords: N2O emissions; anammox; greenhouse gases; model calibration; nitrogen removal; wastewater treatment.

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References

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