Numerical modelling of surface aeration and N 2 O emission in biological water resource recovery

Biokinetic modelling of N O production and emission has been extensively studied in the past fifteen years. In contrast, the physical-chemical hydrodynamics of activated sludge reactor design and operation, and their impact on N O emission, is less well understood. This study addresses knowledge gap...

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Bibliographic Details
Published inWater research (Oxford) Vol. 255; p. 121398
Main Authors Qiu, Yuge, Ekström, Sara, Valverde-Pérez, Borja, Smets, Barth F, Climent, Javier, Domingo-Félez, Carlos, Cuenca, Raúl Martínez, Plósz, Benedek G
Format Journal Article
LanguageEnglish
Published England 15.05.2024
Subjects
Oxygen and NO gas mass-transfer
Computational fluid dynamics
Factor screening using design of experiment
Calibration of single- and two-phase models
Surface aeration
Biological water resource recovery
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Summary:Biokinetic modelling of N O production and emission has been extensively studied in the past fifteen years. In contrast, the physical-chemical hydrodynamics of activated sludge reactor design and operation, and their impact on N O emission, is less well understood. This study addresses knowledge gaps related to the systematic identification and calibration of computational fluid dynamic (CFD) simulation models. Additionally, factors influencing reliable prediction of aeration and N O emission in surface aerated oxidation ditch-type reactor types are evaluated. The calibrated model accurately predicts liquid sensor measurements obtained in the Lynetten Water Resource Recovery Facility (WRRF), Denmark. Results highlight the equal importance of design and operational boundary conditions, alongside biokinetic parameters, in predicting N O emission. Insights into the limitations of calibrating gas mass-transfer processes in two-phase CFD models of surface aeration systems are evaluated.
ISSN:1879-2448