Numerical modelling of surface aeration and N2O emission in biological water resource recovery

Yuge Qiu; Sara Ekström; Borja Valverde-Pérez; Barth F.  Smets; Javier Climent; Carlos Domingo-Félez; Raúl Martínez Cuenca; Benedek Plosz

doi:10.1016/j.watres.2024.121398

Numerical modelling of surface aeration and N2O emission in biological water resource recovery

Yuge Qiu, Sara Ekström, Borja Valverde-Pérez, Barth F. Smets, Javier Climent, Carlos Domingo-Félez, Raúl Martínez Cuenca, Benedek Plosz

Research output: Contribution to journal › Article › peer-review

14 Citations (SciVal)

Abstract

Biokinetic modelling of N2O 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 N2O 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 N2O 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 N2O emission. Insights into the limitations of calibrating gas mass-transfer processes in two-phase CFD models of surface aeration systems are evaluated.

Original language	English
Article number	121398
Number of pages	13
Journal	Water Research
Volume	255
Early online date	29 Feb 2024
DOIs	https://doi.org/10.1016/j.watres.2024.121398
Publication status	Published - 15 May 2024

Data Availability Statement

Data will be made available on request.

Acknowledgements

We are grateful to Christopher T. Griffin who was part of this project at an early stage, and who contributed to the setup of the CFD simulation platform. We would like to thank Carsten Thirsing, BIOFOS, the operator of Lynetten WRRF for all the help and support of our field experimental work. The authors have no conflict of interest to declare.

Funding

This research was partially funded by the Danish Agency for Science, Technology and Innovation through the Research Project LaGas ( 12-132633 ). We acknowledge the generous support of Mr. Yichen Qiu and Mrs. Pingyun Ge, parents of Ms. Yuge Qiu (first author), and their financial support received.

Funders	Funder number
Danish Agency for Science and Higher Education	12-132633
Danish Agency for Science and Higher Education

Keywords

Biological water resource recovery
Calibration of single- and two-phase models
Computational fluid dynamics
Factor screening using design of experiment
Oxygen and N O gas mass-transfer
Surface aeration

ASJC Scopus subject areas

Water Science and Technology
Ecological Modelling
Pollution
Waste Management and Disposal
Environmental Engineering
Civil and Structural Engineering

Access to Document

10.1016/j.watres.2024.121398Licence: CC BY

Cite this

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title = "Numerical modelling of surface aeration and N2O emission in biological water resource recovery",

abstract = "Biokinetic modelling of N2O 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 N2O 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 N2O 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 N2O emission. Insights into the limitations of calibrating gas mass-transfer processes in two-phase CFD models of surface aeration systems are evaluated. ",

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AU - Qiu, Yuge

AU - Ekström, Sara

AU - Valverde-Pérez, Borja

AU - Smets, Barth F.

AU - Climent, Javier

AU - Domingo-Félez, Carlos

AU - Martínez Cuenca, Raúl

AU - Plosz, Benedek

PY - 2024/5/15

Y1 - 2024/5/15

N2 - Biokinetic modelling of N2O 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 N2O 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 N2O 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 N2O emission. Insights into the limitations of calibrating gas mass-transfer processes in two-phase CFD models of surface aeration systems are evaluated.

AB - Biokinetic modelling of N2O 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 N2O 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 N2O 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 N2O emission. Insights into the limitations of calibrating gas mass-transfer processes in two-phase CFD models of surface aeration systems are evaluated.

KW - Biological water resource recovery

KW - Calibration of single- and two-phase models

KW - Computational fluid dynamics

KW - Factor screening using design of experiment

KW - Oxygen and N O gas mass-transfer

KW - Surface aeration

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Numerical modelling of surface aeration and N2O emission in biological water resource recovery

Abstract

Data Availability Statement

Acknowledgements

Funding

Keywords

ASJC Scopus subject areas

Access to Document

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